Contacts of the helix formed by residues 566 - 602 (chain B) in PDB entry 1FU1


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with VAL 566 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    562B  PHE*     3.3    37.4    +      -       +      +
    563B  GLU*     4.0     7.6    -      -       -      +
    564B  LYS      3.3     0.2    -      -       -      -
    565B  CAS      1.3    99.0    +      -       +      +
    567B  SER*     1.3    55.1    +      -       -      +
    569B  LYS*     5.9     3.1    -      -       -      +
    570B  GLU*     2.3    60.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 567 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    563B  GLU      3.2    13.8    +      -       -      -
    564B  LYS*     3.3    10.0    +      -       -      -
    565B  CAS      3.3     0.6    -      -       -      -
    566B  VAL*     1.3    76.5    -      -       -      +
    568B  ALA*     1.3    65.3    +      -       -      +
    570B  GLU*     3.7    14.7    +      -       -      +
    571B  ALA*     3.0    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 568 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    564B  LYS      3.0    12.6    +      -       -      +
    565B  CAS      2.9    15.3    +      -       -      +
    567B  SER*     1.3    76.0    -      -       -      +
    569B  LYS*     1.3    59.4    +      -       -      +
    571B  ALA*     2.8    22.4    +      -       -      +
    572B  LEU*     3.0    18.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 569 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169A  LYS*     3.3    28.3    -      -       -      +
    565B  CAS      2.8    53.8    +      -       +      +
    566B  VAL*     3.9     4.3    +      -       -      +
    568B  ALA*     1.3    68.4    -      -       -      +
    570B  GLU*     1.3    67.1    +      -       -      +
    571B  ALA      2.8     6.4    +      -       -      -
    572B  LEU*     4.3    12.8    -      -       +      +
    573B  GLU*     2.9    53.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 570 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    566B  VAL*     2.3    51.5    +      -       +      +
    567B  SER*     3.7    15.7    +      -       -      +
    569B  LYS*     1.3    75.4    -      -       -      +
    571B  ALA*     1.3    55.7    +      -       -      +
    573B  GLU*     4.3     4.0    -      -       -      +
    574B  THR*     2.9    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 571 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    567B  SER      3.0    10.5    +      -       -      +
    568B  ALA*     2.8    13.2    +      -       -      +
    570B  GLU*     1.3    77.5    -      -       -      +
    572B  LEU*     1.3    66.4    +      -       -      +
    573B  GLU      3.1     1.6    -      -       -      -
    574B  THR*     3.0    16.0    +      -       -      -
    575B  ASP*     3.2    17.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 572 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    568B  ALA*     3.0    16.6    +      -       +      +
    569B  LYS*     4.0    11.4    -      -       +      +
    571B  ALA*     1.3    75.5    -      -       -      +
    573B  GLU*     1.3    62.7    +      -       -      +
    575B  ASP*     3.3    13.5    +      -       +      +
    576B  LEU*     3.1    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 573 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169A  LYS*     4.8     5.3    +      -       -      -
    569B  LYS*     2.9    52.5    +      -       +      +
    570B  GLU*     4.4     4.0    -      -       -      +
    572B  LEU*     1.3    75.9    -      -       -      +
    574B  THR*     1.3    55.0    +      -       -      +
    576B  LEU*     2.9    16.7    +      -       +      +
    577B  TYR*     2.7    39.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 574 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    570B  GLU*     2.9    21.1    +      -       -      +
    571B  ALA*     3.0     9.9    +      -       -      -
    573B  GLU*     1.3    77.1    -      -       -      +
    575B  ASP*     1.3    58.1    +      -       -      +
    577B  TYR*     3.6    11.0    -      -       +      +
    578B  LYS*     2.8    51.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 575 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    571B  ALA*     3.2    15.0    +      -       -      +
    572B  LEU*     3.5    15.7    -      -       +      +
    573B  GLU      3.1     0.6    -      -       -      -
    574B  THR*     1.3    77.1    -      -       -      +
    576B  LEU*     1.3    59.3    +      -       -      +
    577B  TYR      3.0     0.5    +      -       -      -
    578B  LYS*     3.1    11.0    +      -       -      +
    579B  ARG*     2.8    34.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 576 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    572B  LEU      3.1    10.4    +      -       -      +
    573B  GLU*     3.2    18.8    -      -       +      +
    575B  ASP*     1.3    78.8    -      -       -      +
    577B  TYR*     1.3    58.8    +      -       -      +
    579B  ARG*     3.8     7.4    -      -       +      +
    580B  PHE*     3.5    18.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 577 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    573B  GLU*     2.7    21.9    +      -       +      +
    574B  THR*     3.6    12.3    -      -       +      +
    576B  LEU*     1.3    72.2    -      -       -      +
    578B  LYS*     1.3    74.2    +      -       +      +
    579B  ARG      3.1     1.6    -      -       -      -
    580B  PHE*     3.2    13.4    +      +       +      +
    581B  ILE*     3.0    56.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 578 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    574B  THR*     2.8    40.6    +      -       +      +
    575B  ASP*     3.7     9.2    -      -       -      +
    577B  TYR*     1.3    81.4    -      -       +      +
    579B  ARG*     1.3    62.5    +      -       -      +
    581B  ILE*     3.3     9.6    +      -       +      +
    582B  LEU*     3.0    23.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 579 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    575B  ASP*     2.8    18.3    +      -       +      +
    576B  LEU*     3.8    11.0    -      -       +      +
    578B  LYS*     1.3    75.6    -      -       -      +
    580B  PHE*     1.3    56.4    +      -       -      +
    582B  LEU*     2.7    45.7    +      -       -      +
    583B  VAL*     2.8    25.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 580 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    576B  LEU      3.5    10.5    +      -       -      +
    577B  TYR*     3.2    18.0    +      +       +      +
    579B  ARG*     1.3    77.9    -      -       -      +
    581B  ILE*     1.3    67.6    +      -       +      +
    583B  VAL*     3.1    20.1    +      -       +      +
    584B  LEU*     2.9    53.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 581 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    577B  TYR*     3.0    58.3    +      -       +      +
    578B  LYS*     3.6    11.9    -      -       +      +
    580B  PHE*     1.3    79.5    -      -       +      +
    582B  LEU*     1.3    64.8    +      -       -      +
    584B  LEU*     3.3    13.7    +      -       +      +
    585B  ASN*     3.0    23.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 582 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578B  LYS      3.0    11.5    +      -       -      +
    579B  ARG*     2.7    36.4    +      -       -      +
    581B  ILE*     1.3    79.3    -      -       -      +
    583B  VAL*     1.3    54.7    +      -       +      +
    585B  ASN*     3.1    15.8    +      -       +      +
    586B  GLU*     2.8    44.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 583 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    579B  ARG*     2.8    29.8    +      -       -      +
    580B  PHE*     3.1    21.5    +      -       +      +
    582B  LEU*     1.3    77.1    -      -       -      +
    584B  LEU*     1.3    63.7    +      -       +      +
    586B  GLU*     3.3     6.5    +      -       -      +
    587B  LYS*     3.1    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 584 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    580B  PHE*     2.9    44.0    +      -       +      +
    581B  ILE*     3.5    16.4    -      -       +      +
    582B  LEU      3.3     0.2    -      -       -      -
    583B  VAL*     1.3    78.3    -      -       +      +
    585B  ASN*     1.3    64.2    +      -       -      +
    587B  LYS*     3.5     8.7    +      -       +      +
    588B  LYS*     3.5    15.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 585 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    581B  ILE*     3.0    15.2    +      -       +      +
    582B  LEU*     3.4    18.2    -      -       +      +
    584B  LEU*     1.3    75.3    -      -       -      +
    586B  GLU*     1.3    58.1    +      -       -      +
    588B  LYS*     2.6    60.0    +      -       -      +
    589B  THR*     2.8    17.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 586 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    582B  LEU*     2.8    33.1    +      -       +      +
    583B  VAL*     3.8     6.3    -      -       -      +
    585B  ASN*     1.3    73.2    -      -       -      +
    587B  LYS*     1.3    59.0    +      -       +      +
    589B  THR*     4.2    20.0    +      -       -      +
    590B  LYS*     3.0    58.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 587 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    583B  VAL*     3.1    32.6    +      -       +      +
    584B  LEU*     3.7    10.1    -      -       +      +
    585B  ASN      3.1     0.2    -      -       -      -
    586B  GLU*     1.3    76.4    -      -       +      +
    588B  LYS*     1.3    58.2    +      -       -      +
    590B  LYS*     4.4    22.5    -      -       +      +
    591B  ILE*     2.8    25.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 588 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    584B  LEU      3.5     5.8    +      -       -      +
    585B  ASN*     2.6    50.3    +      -       -      +
    587B  LYS*     1.3    74.1    -      -       -      +
    589B  THR*     1.3    63.1    +      -       -      +
    590B  LYS      3.3     1.1    -      -       -      -
    591B  ILE*     3.4     9.8    -      -       -      +
    592B  ARG*     3.3    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 589 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    585B  ASN*     2.8    32.7    +      -       -      -
    586B  GLU*     3.1    23.7    +      -       -      +
    588B  LYS*     1.3    77.8    -      -       -      +
    590B  LYS*     1.3    60.7    +      -       +      +
    592B  ARG*     3.5     5.3    +      -       -      +
    593B  SER*     3.1    29.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 590 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    586B  GLU*     3.0    40.7    +      -       -      +
    587B  LYS*     4.8    22.7    -      -       +      +
    589B  THR*     1.3    74.0    -      -       -      +
    591B  ILE*     1.3    62.1    +      -       +      +
    593B  SER*     3.3     6.4    +      -       -      -
    594B  LEU*     2.9    43.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 591 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587B  LYS      2.8    28.0    -      -       -      +
    588B  LYS*     3.4    11.2    -      -       -      +
    589B  THR      3.3     0.2    -      -       -      -
    590B  LYS*     1.3    78.7    -      -       +      +
    592B  ARG*     1.3    61.5    +      -       +      +
    594B  LEU*     4.7     5.2    -      -       +      -
    595B  HIS*     2.7    49.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 592 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    588B  LYS*     3.3    22.6    +      -       +      +
    589B  THR*     3.9     6.3    -      -       +      +
    590B  LYS      3.2     0.2    -      -       -      -
    591B  ILE*     1.3    80.7    -      -       +      +
    593B  SER*     1.3    65.9    +      -       -      +
    594B  LEU      3.0     2.0    +      -       -      -
    595B  HIS*     3.8    24.1    +      -       -      -
    596B  ASN*     2.8    46.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 593 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    589B  THR*     3.1    20.4    +      -       -      -
    590B  LYS*     3.7     8.1    -      -       -      -
    592B  ARG*     1.3    76.2    -      -       -      +
    594B  LEU*     1.3    63.8    +      -       -      +
    597B  LYS*     3.1    35.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 594 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    590B  LYS*     2.9    26.5    +      -       +      +
    591B  ILE*     3.8     5.2    -      -       +      +
    592B  ARG      3.0     0.4    -      -       -      -
    593B  SER*     1.3    77.4    -      -       -      +
    595B  HIS*     1.3    52.6    +      -       -      +
    596B  ASN      2.4    15.1    +      -       -      -
    597B  LYS*     2.5     4.4    +      -       +      -
    598B  LEU*     2.3    60.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 595 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    591B  ILE*     2.7    31.6    +      -       +      +
    592B  ARG*     3.8    26.8    +      -       -      +
    594B  LEU*     1.3    71.1    -      -       -      +
    596B  ASN*     1.3    62.4    +      -       -      +
    598B  LEU*     3.5    13.4    -      -       -      +
    599B  LEU*     2.8    65.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 596 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    592B  ARG*     2.8    54.8    +      -       -      +
    593B  SER      4.8     0.4    -      -       -      +
    594B  LEU      2.4    13.4    +      -       -      -
    595B  HIS*     1.3    75.8    -      -       -      +
    597B  LYS*     1.3    69.5    +      -       +      +
    598B  LEU      3.2     3.0    +      -       -      -
    599B  LEU*     3.8     7.7    +      -       -      +
    600B  ASN*     3.7    13.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 597 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    593B  SER*     3.1    24.2    +      -       -      +
    594B  LEU*     2.5     9.3    +      -       +      -
    596B  ASN*     1.3    79.9    -      -       +      +
    598B  LEU*     1.3    56.3    +      -       -      -
    600B  ASN*     3.1    24.8    -      -       +      +
    601B  ALA*     2.8    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 598 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    594B  LEU*     2.3    65.4    +      -       +      +
    595B  HIS*     3.5     9.4    -      -       -      +
    597B  LYS*     1.3    66.4    -      -       -      +
    599B  LEU*     1.3    54.3    +      -       +      +
    600B  ASN      2.8     5.2    -      -       -      -
    601B  ALA*     3.4     9.4    -      -       +      +
    602B  ALA*     2.6    45.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 599 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    595B  HIS*     2.8    51.7    +      -       +      +
    596B  ASN*     3.8     8.9    +      -       -      +
    598B  LEU*     1.3    80.6    -      -       +      +
    600B  ASN*     1.3    50.5    +      -       -      +
    602B  ALA*     4.7     3.8    -      -       +      -
    603B  GLN*     2.4    48.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 600 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    596B  ASN      3.7     5.4    +      -       -      +
    597B  LYS*     3.1    36.6    -      -       +      +
    599B  LEU*     1.3    81.7    -      -       -      +
    601B  ALA*     1.3    59.4    +      -       -      +
    602B  ALA      3.4     0.4    -      -       -      -
    603B  GLN*     3.7    13.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 601 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    597B  LYS      2.8    17.0    +      -       -      +
    598B  LEU*     3.1    13.7    +      -       +      +
    600B  ASN*     1.3    79.7    -      -       -      +
    602B  ALA*     1.3    61.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 602 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    598B  LEU*     2.6    32.0    +      -       +      +
    599B  LEU*     4.7     4.9    -      -       +      -
    601B  ALA*     1.3    77.2    -      -       -      +
    603B  GLN*     1.3    61.9    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il