Contacts of the helix formed by residues 647 - 671 (chain A) in PDB entry 3F7F


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 PHE 647 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    579A  ILE*     3.6    33.2    -      -       +      -
    580A  PRO*     3.8    29.2    -      -       +      -
    583A  LEU*     3.9     4.7    -      -       +      -
    637A  PHE*     3.6    30.7    -      +       +      -
    642A  LEU*     4.0    27.6    -      -       +      -
    643A  ASP      3.0    21.4    +      -       -      +
    644A  THR      4.1     1.3    -      -       -      -
    646A  ILE*     1.3    96.0    -      -       +      +
    648A  GLY*     1.3    54.9    +      -       -      +
    649A  GLN      3.1     2.9    -      -       -      -
    650A  HIS*     3.2    23.6    +      +       +      +
    651A  ILE*     2.7    40.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 648 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    644A  THR      3.2    20.5    +      -       -      -
    645A  GLU*     3.2     9.2    +      -       -      -
    646A  ILE      3.1     5.7    -      -       -      -
    647A  PHE*     1.3    76.1    -      -       -      +
    649A  GLN*     1.3    61.0    +      -       -      +
    651A  ILE*     3.9     4.8    -      -       -      +
    652A  SER*     3.1    24.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 649 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645A  GLU      4.8     0.4    +      -       -      -
    646A  ILE      4.3     5.4    +      -       -      +
    647A  PHE      3.1     1.0    -      -       -      -
    648A  GLY*     1.3    75.5    -      -       -      +
    650A  HIS*     1.3    66.3    +      -       +      +
    652A  SER*     3.0    15.5    +      -       -      -
    653A  THR*     2.9    52.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 650 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    580A  PRO*     4.4     5.3    +      -       +      +
    583A  LEU*     4.2    15.0    -      -       +      +
    584A  ASN*     4.1    39.2    +      -       -      -
    587A  ILE*     3.4    30.9    -      -       +      +
    588A  ASN*     4.2     9.9    -      -       -      -
    637A  PHE*     5.0     0.9    -      -       +      -
    646A  ILE      5.7     1.3    -      -       -      -
    647A  PHE*     3.2    36.0    +      +       +      +
    649A  GLN*     1.3    85.7    -      -       +      +
    651A  ILE*     1.3    58.3    +      -       -      +
    653A  THR*     3.2     4.6    +      -       -      -
    654A  LEU*     2.8    41.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 651 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    546A  THR*     4.4     8.7    -      -       +      +
    550A  PHE*     3.7    31.6    -      -       +      -
    634A  LEU*     4.1     4.2    -      -       +      +
    637A  PHE*     3.9    34.3    -      -       +      -
    642A  LEU      5.4     1.6    -      -       -      +
    644A  THR*     4.0    27.6    -      -       -      +
    647A  PHE*     2.7    37.5    +      -       +      +
    648A  GLY*     3.9     5.4    -      -       -      +
    650A  HIS*     1.3    73.1    -      -       -      +
    652A  SER*     1.3    58.5    +      -       -      +
    654A  LEU*     3.7     8.2    -      -       -      +
    655A  LEU*     3.0    41.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 652 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    648A  GLY      3.1    13.4    +      -       -      -
    649A  GLN*     3.0    22.9    +      -       -      -
    651A  ILE*     1.3    78.4    -      -       -      +
    653A  THR*     1.3    64.2    +      -       -      +
    655A  LEU*     4.1     8.2    -      -       -      +
    656A  ASP*     3.2    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 653 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587A  ILE*     3.8    27.6    -      -       +      -
    592A  LYS*     3.9    30.2    +      -       +      +
    649A  GLN*     2.9    38.2    +      -       -      +
    650A  HIS*     3.7     7.5    +      -       -      -
    652A  SER*     1.3    76.6    -      -       -      +
    654A  LEU*     1.3    59.6    +      -       -      +
    656A  ASP*     3.4     5.7    +      -       +      +
    657A  LEU*     3.0    31.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 654 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    583A  LEU*     5.2     0.7    -      -       +      -
    586A  LEU*     5.7     1.6    -      -       +      -
    587A  ILE*     3.7    30.3    -      -       +      -
    591A  MET*     5.0     8.5    -      -       -      -
    630A  THR*     3.7    22.4    -      -       +      +
    633A  VAL*     3.8    31.9    -      -       +      -
    634A  LEU*     3.5    25.1    -      -       +      -
    637A  PHE*     4.0    13.2    -      -       +      -
    650A  HIS*     2.8    27.7    +      -       +      +
    651A  ILE*     3.7     0.7    -      -       -      +
    653A  THR*     1.3    75.7    -      -       -      +
    655A  LEU*     1.3    59.8    +      -       -      +
    656A  ASP      3.1     0.2    -      -       -      -
    657A  LEU*     3.0     9.0    +      -       +      +
    658A  HIS*     2.7    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 655 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532A  PHE*     3.6    44.4    -      -       +      +
    535A  ILE*     4.1    28.0    -      -       +      -
    536A  ILE*     3.6    20.3    -      -       +      +
    550A  PHE*     4.7     4.9    -      -       +      -
    634A  LEU*     3.7    19.5    -      -       +      -
    651A  ILE*     3.0    38.7    +      -       +      +
    652A  SER*     3.6     8.0    +      -       -      +
    654A  LEU*     1.3    75.5    -      -       -      +
    656A  ASP*     1.3    60.5    +      -       -      +
    658A  HIS*     3.8     5.5    +      -       -      +
    659A  TYR*     3.2    22.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 656 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    536A  ILE*     4.4    10.0    -      -       +      +
    592A  LYS*     6.0     0.9    -      -       -      -
    652A  SER      3.2    19.0    +      -       -      +
    653A  THR*     3.6     6.9    -      -       +      +
    654A  LEU      3.1     0.6    -      -       -      -
    655A  LEU*     1.3    77.4    -      -       -      +
    657A  LEU*     1.3    69.0    +      -       -      +
    659A  TYR*     3.5     4.2    +      -       -      +
    660A  LYS*     2.6    62.1    +      -       -      +
    714A  ILE*     3.7    14.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 657 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587A  ILE*     4.9     5.2    -      -       +      -
    591A  MET*     4.5    22.9    -      -       +      -
    592A  LYS*     4.3    22.0    -      -       +      -
    630A  THR*     4.7     2.0    -      -       +      -
    653A  THR*     3.0    38.8    +      -       +      +
    654A  LEU*     3.0     9.4    +      -       +      +
    656A  ASP*     1.3    81.4    -      -       -      +
    658A  HIS*     1.3    61.3    +      -       -      +
    660A  LYS*     3.4     4.0    +      -       +      +
    661A  GLN*     2.9    45.2    +      -       -      +
    710A  TYR*     3.4    50.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 658 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    529A  SER*     2.8    46.9    +      -       -      -
    532A  PHE*     3.6    17.2    -      -       +      +
    533A  LEU*     3.9    18.1    -      -       +      +
    627A  TYR*     3.5    23.9    -      +       -      -
    630A  THR*     3.7     9.4    -      -       +      +
    631A  LEU*     3.7    22.7    -      -       +      +
    634A  LEU*     3.9    13.5    -      -       +      -
    654A  LEU      2.7    16.9    +      -       -      +
    655A  LEU      3.8     5.1    +      -       -      +
    657A  LEU*     1.3    76.9    -      -       -      +
    659A  TYR*     1.3    58.4    +      -       -      +
    661A  GLN*     3.1    15.2    +      -       -      +
    662A  PHE*     2.8    30.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 659 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    533A  LEU*     3.5    26.9    -      -       +      -
    536A  ILE*     3.6    34.9    -      -       +      +
    537A  THR*     3.9    19.1    -      -       +      +
    655A  LEU      3.2    15.8    +      -       -      +
    656A  ASP*     3.7     5.8    -      -       -      +
    657A  LEU      3.3     0.2    -      -       -      -
    658A  HIS*     1.3    79.5    +      -       -      +
    660A  LYS*     1.3    63.6    +      -       -      +
    662A  PHE*     3.4     1.9    +      -       -      +
    663A  LEU*     3.0    52.6    +      -       +      +
    714A  ILE*     3.6    37.2    +      -       +      -
    716A  GLU*     3.7     6.9    +      -       -      -
    725A  ARG*     3.1    30.5    -      -       -      +
    729A  ILE*     4.1     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 660 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    656A  ASP*     2.6    48.9    +      -       -      +
    657A  LEU*     3.9     4.0    -      -       +      +
    659A  TYR*     1.3    80.1    -      -       +      +
    661A  GLN*     1.3    57.4    +      -       -      +
    663A  LEU*     3.4     2.6    +      -       -      +
    664A  LEU*     2.9    31.1    +      -       -      +
    709A  VAL*     3.6    27.6    -      -       +      +
    710A  TYR*     2.9    34.9    +      -       +      +
    711A  ASN      4.9     0.6    -      -       -      -
    712A  ALA      3.5    20.7    +      -       -      +
    714A  ILE*     3.9    27.4    -      -       +      -
    720B  PHE*     4.0    13.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 661 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    591A  MET*     3.5     9.1    -      -       -      +
    623A  LEU*     4.1    20.8    -      -       +      +
    626A  HIS*     3.7     1.2    +      -       -      +
    627A  TYR*     3.2    33.8    -      -       +      -
    630A  THR*     2.8    27.6    +      -       -      -
    657A  LEU*     2.9    30.1    +      -       -      +
    658A  HIS*     3.3    16.7    -      -       -      +
    660A  LYS*     1.3    73.0    -      -       -      +
    662A  PHE*     1.3    68.5    +      -       -      +
    664A  LEU*     3.4     4.3    +      -       -      +
    665A  LEU*     2.9    30.5    +      -       -      +
    710A  TYR*     3.0    30.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 662 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    397A  ILE*     5.0     3.8    -      -       +      -
    398A  VAL*     4.1    28.4    -      -       +      +
    529A  SER*     4.1     9.9    -      -       -      -
    533A  LEU*     3.5    36.6    -      -       +      -
    627A  TYR*     3.7    32.7    -      +       +      -
    658A  HIS*     2.8    20.6    +      -       +      +
    659A  TYR      3.6     4.0    -      -       -      +
    661A  GLN*     1.3    72.1    -      -       -      +
    663A  LEU*     1.3    67.0    +      -       -      +
    665A  LEU*     2.9     8.5    +      -       -      +
    666A  ASN*     2.7    43.5    +      -       +      +
    729A  ILE*     3.8    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 663 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    659A  TYR*     3.0    47.9    +      -       +      +
    660A  LYS      3.6     4.3    -      -       -      +
    662A  PHE*     1.3    79.0    -      -       +      +
    664A  LEU*     1.3    57.7    +      -       -      +
    666A  ASN*     2.9     9.6    +      -       -      +
    667A  LEU*     2.8    35.6    +      -       +      +
    714A  ILE*     4.9     2.2    -      -       +      -
    725A  ARG*     5.3     1.8    -      -       +      -
    729A  ILE*     3.3    40.4    -      -       +      -
    720B  PHE*     3.7    34.1    -      -       +      -
    724B  PHE*     4.2    23.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 664 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    616A  LEU*     6.3     0.2    -      -       +      -
    619A  LEU*     4.0    18.6    -      -       +      +
    620A  HIS*     5.4     2.7    -      -       +      -
    623A  LEU*     2.8    40.8    -      -       +      -
    660A  LYS      2.9    20.3    +      -       -      +
    661A  GLN      3.8     3.1    -      -       -      +
    663A  LEU*     1.3    72.6    -      -       -      +
    665A  LEU*     1.3    62.0    +      -       +      +
    667A  LEU*     3.1     4.6    +      -       -      +
    668A  TYR*     2.8    29.5    +      -       +      +
    675A  LEU*     4.0    23.3    -      -       +      -
    679A  LEU*     4.4     4.7    -      -       +      -
    709A  VAL*     4.0    15.5    -      -       +      -
    719B  PHE*     3.8    27.6    -      -       +      -
    720B  PHE*     3.9     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 665 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398A  VAL*     3.8    31.4    -      -       +      -
    620A  HIS*     3.4    27.6    -      -       +      +
    623A  LEU*     4.3    10.3    -      -       +      +
    624A  SER*     3.2    34.8    -      -       -      +
    627A  TYR*     3.9    30.5    -      -       +      -
    661A  GLN      2.9    19.0    +      -       -      +
    662A  PHE*     2.9     4.8    +      -       -      +
    664A  LEU*     1.3    78.4    -      -       +      +
    666A  ASN*     1.3    61.2    +      -       -      +
    668A  TYR*     3.4     4.6    +      -       -      +
    669A  ARG*     3.0    36.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 666 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398A  VAL*     4.1    15.7    -      -       +      +
    400A  LYS*     4.0    15.8    +      -       -      +
    662A  PHE*     2.7    34.9    +      -       +      +
    663A  LEU*     2.9    14.6    +      -       -      +
    665A  LEU*     1.3    75.7    -      -       -      +
    667A  LEU*     1.3    65.5    +      -       +      +
    669A  ARG*     3.4     8.1    +      -       -      +
    670A  GLN*     3.1    46.8    +      -       -      +
    728A  ILE*     3.4    27.6    +      -       -      +
    729A  ILE*     4.2     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 667 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    663A  LEU*     2.8    26.9    +      -       +      +
    664A  LEU*     3.7     4.3    -      -       -      +
    666A  ASN*     1.3    71.5    -      -       +      +
    668A  TYR*     1.3    65.3    +      -       -      +
    670A  GLN*     4.1     1.6    -      -       -      -
    671A  ASP      3.1    21.7    +      -       -      +
    675A  LEU*     4.2    17.4    -      -       +      +
    728A  ILE*     4.2    11.2    -      -       +      -
    719B  PHE*     4.5     2.7    -      -       +      -
    720B  PHE*     3.8    29.6    -      -       +      +
    723B  PHE*     3.5    65.3    -      -       +      -
    724B  PHE*     3.9    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 668 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387A  VAL*     4.1    12.8    -      -       +      +
    616A  LEU*     4.1    26.5    -      -       +      -
    617A  GLU*     2.5    41.1    +      -       -      -
    620A  HIS*     3.1    56.5    -      +       +      -
    664A  LEU*     2.8    13.9    +      -       +      +
    665A  LEU*     3.5     8.5    -      -       -      +
    667A  LEU*     1.3    80.7    -      -       -      +
    669A  ARG*     1.3    72.4    +      -       +      +
    672A  LYS*     3.3    56.1    +      -       +      +
    675A  LEU*     3.6    13.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 669 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  GLN*     5.0     5.1    +      -       -      -
    396A  ASP*     3.0    31.7    +      -       -      -
    398A  VAL*     3.5    14.6    -      -       -      +
    399A  THR*     3.1    39.7    +      -       +      +
    400A  LYS      5.7     0.7    -      -       -      +
    406A  ARG*     5.5     3.5    +      -       -      -
    410A  ASN*     5.7     3.2    -      -       -      +
    413A  SER*     2.8    28.5    +      -       -      +
    414A  ARG*     6.5     0.7    -      -       -      -
    620A  HIS*     2.6    38.5    +      -       -      -
    624A  SER*     4.5     1.6    +      -       -      -
    665A  LEU*     3.0    28.7    +      -       -      +
    666A  ASN*     3.8    10.5    -      -       -      +
    668A  TYR*     1.3    86.9    -      -       +      +
    670A  GLN*     1.3    61.0    +      -       -      +
    671A  ASP      3.4     0.4    -      -       -      -
    672A  LYS*     4.4     3.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 670 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    400A  LYS*     3.5    15.1    -      -       -      +
    406A  ARG*     3.8    33.3    -      -       -      +
    413A  SER*     4.7     4.8    +      -       -      -
    666A  ASN*     3.1    35.7    +      -       -      +
    667A  LEU*     3.2     8.5    +      -       +      +
    669A  ARG*     1.3    81.5    -      -       -      +
    671A  ASP*     1.3    63.0    +      -       -      +
    728A  ILE*     3.9    11.3    -      -       +      +
    723B  PHE*     4.3     7.2    -      -       +      -
    727B  TYR*     3.0    53.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 671 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  SER*     5.3     2.0    -      -       -      -
    667A  LEU      3.1     9.1    +      -       -      -
    669A  ARG      3.4     1.0    -      -       -      -
    670A  GLN*     1.3    82.3    -      -       -      +
    672A  LYS*     1.3    61.9    +      -       -      +
    673A  CYS*     3.4     8.7    +      -       -      +
    674A  LEU*     3.0    29.9    +      -       -      +
    675A  LEU*     3.0    18.7    +      -       -      +
    723B  PHE*     3.8    16.0    -      -       +      -
    727B  TYR*     3.9    15.7    -      -       +      -
----------------------------------------------------------
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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