Contacts of the helix formed by residues 438 - 466 (chain B) in PDB entry 3QMK


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 ASP 438 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434B  VAL*     2.7    25.3    +      -       +      +
    437B  VAL*     1.3    82.7    -      -       +      +
    439B  PRO*     1.3    64.0    -      -       -      +
    440B  GLU*     3.8     7.4    +      -       -      +
    441B  LYS*     3.1    35.7    +      -       +      +
    442B  ALA      3.1     6.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 439 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359A  GLN*     5.9     0.2    +      -       -      -
    362A  GLU*     4.2    11.8    -      -       +      +
    363A  GLU*     5.9     4.9    -      -       +      -
    366A  SER*     2.9    39.5    -      -       -      +
    434B  VAL      3.7     0.4    -      -       -      -
    435B  ALA*     3.5     7.9    -      -       -      +
    437B  VAL      3.7     4.7    -      -       -      +
    438B  ASP*     1.3    89.5    -      -       -      +
    440B  GLU*     1.3    61.7    +      -       -      +
    442B  ALA*     3.3     8.5    +      -       +      +
    443B  GLN*     3.1    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 440 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438B  ASP*     3.2     8.1    +      -       -      +
    439B  PRO*     1.3    78.9    -      -       -      +
    441B  LYS*     1.3    62.5    +      -       -      +
    443B  GLN*     3.3    12.2    +      -       -      +
    444B  GLN*     3.2    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 441 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434B  VAL*     3.8    12.1    -      -       +      -
    438B  ASP*     3.1    29.4    +      -       -      +
    440B  GLU*     1.3    75.6    -      -       -      +
    442B  ALA*     1.3    65.6    +      -       -      +
    444B  GLN*     3.1    30.2    +      -       -      +
    445B  MET*     3.1    17.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 442 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362A  GLU*     3.8    12.5    -      -       +      +
    431B  TYR*     3.6    11.9    -      -       +      -
    434B  VAL*     3.6     8.2    -      -       +      +
    435B  ALA*     3.6    41.7    -      -       +      +
    438B  ASP      3.1     6.6    +      -       -      +
    439B  PRO*     3.4    11.0    -      -       +      +
    441B  LYS*     1.3    77.4    -      -       -      +
    443B  GLN*     1.3    60.5    +      -       -      +
    445B  MET*     3.4     9.9    -      -       -      +
    446B  ARG*     3.1    19.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 443 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    355A  GLN*     5.2     1.0    -      -       -      +
    359A  GLN*     2.6    39.2    +      -       -      +
    362A  GLU*     3.7     1.5    +      -       -      +
    439B  PRO      3.1    12.4    +      -       -      +
    440B  GLU*     3.4    13.6    +      -       -      +
    441B  LYS      3.2     0.2    -      -       -      -
    442B  ALA*     1.3    78.4    -      -       -      +
    444B  GLN*     1.3    64.6    +      -       +      +
    445B  MET      3.5     0.2    +      -       -      -
    446B  ARG*     3.5    41.8    +      -       -      +
    447B  PHE      5.0     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 444 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    440B  GLU*     3.2    15.0    -      -       -      +
    441B  LYS*     3.1    24.8    +      -       -      +
    443B  GLN*     1.3    81.3    -      -       +      +
    445B  MET*     1.3    58.5    +      -       +      +
    446B  ARG      3.8     0.2    +      -       -      -
    447B  PHE*     4.9     3.3    +      -       -      +
    448B  GLN*     5.3     2.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 445 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430B  HIS*     3.4    36.1    -      -       +      +
    431B  TYR*     3.8    29.8    -      -       +      -
    434B  VAL*     3.7    33.2    -      -       +      -
    441B  LYS      3.1     8.0    +      -       -      +
    442B  ALA*     3.4     9.6    -      -       -      +
    444B  GLN*     1.3    74.8    -      -       -      +
    446B  ARG*     1.3    67.9    +      -       -      +
    447B  PHE      3.4     1.8    -      -       -      -
    448B  GLN*     2.9    29.1    +      -       +      +
    449B  VAL*     2.9    24.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 446 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  MET*     3.9     2.6    -      -       -      +
    332A  TRP*     4.6     2.5    -      -       +      -
    355A  GLN*     3.1    52.3    +      -       -      +
    358A  LEU*     3.7    34.6    -      -       +      +
    359A  GLN*     3.6    17.4    +      -       -      +
    362A  GLU*     2.7    41.0    +      -       -      +
    431B  TYR*     3.7    11.4    -      -       +      +
    442B  ALA      3.1    10.4    +      -       -      +
    443B  GLN*     3.5    45.6    +      -       -      +
    444B  GLN      3.5     0.8    -      -       -      -
    445B  MET*     1.3    76.4    -      -       -      +
    447B  PHE*     1.3    62.3    +      -       -      +
    449B  VAL*     3.3     4.1    +      -       -      +
    450B  HIS*     3.1    22.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 447 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332A  TRP*     4.0    19.3    -      +       -      -
    351A  ASN*     4.4    11.9    -      -       -      -
    355A  GLN*     4.1    17.6    +      -       -      +
    443B  GLN      5.0     0.4    +      -       -      -
    444B  GLN      4.9     3.0    +      -       -      +
    445B  MET      3.4     0.6    -      -       -      -
    446B  ARG*     1.3    78.4    -      -       -      +
    448B  GLN*     1.3    59.9    +      -       -      +
    450B  HIS*     3.4    19.6    +      +       -      +
    451B  THR*     2.9    49.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 448 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427B  THR*     6.1     0.2    -      -       -      +
    444B  GLN      5.3     1.7    +      -       -      +
    445B  MET*     2.9    22.7    +      -       +      +
    447B  PHE*     1.3    78.3    -      -       -      +
    449B  VAL*     1.3    65.8    +      -       -      +
    451B  THR*     3.7     6.8    -      -       -      +
    452B  HIS*     2.8    51.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 449 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  MET*     3.8    20.0    -      -       +      -
    427B  THR*     4.0    22.7    -      -       +      +
    428B  LEU*     5.3     2.9    -      -       +      -
    431B  TYR*     3.9    34.1    -      -       +      -
    445B  MET*     2.9    32.8    +      -       +      +
    446B  ARG      3.6     7.2    -      -       -      +
    448B  GLN*     1.3    80.6    -      -       -      +
    450B  HIS*     1.3    61.3    +      -       -      +
    452B  HIS*     3.0     6.3    +      -       -      +
    453B  LEU*     2.8    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 450 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  MET*     3.7    21.6    +      -       -      +
    332A  TRP*     3.5    69.8    +      +       +      +
    333A  ALA*     3.9     8.1    -      -       -      -
    336A  ASP*     3.1    25.2    +      -       -      -
    446B  ARG      3.1     5.3    +      -       -      +
    447B  PHE*     3.5    22.6    -      +       -      +
    449B  VAL*     1.3    80.7    -      -       -      +
    451B  THR*     1.3    62.3    +      -       -      +
    453B  LEU*     3.4     5.2    +      -       -      +
    454B  GLN*     3.2    48.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 451 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    447B  PHE*     2.9    44.3    +      -       +      -
    448B  GLN*     3.7     8.5    -      -       -      +
    450B  HIS*     1.3    74.3    -      -       -      +
    452B  HIS*     1.3    65.8    +      -       -      +
    454B  GLN*     3.2    15.9    +      -       +      +
    455B  VAL*     3.0    31.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 452 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423B  GLU*     2.7    29.1    +      -       +      -
    426B  HIS*     6.1     1.6    -      -       -      -
    427B  THR*     3.2    29.7    +      -       +      +
    448B  GLN*     2.8    38.8    +      -       -      +
    449B  VAL*     3.0     7.6    +      -       -      +
    451B  THR*     1.3    74.0    -      -       -      +
    453B  LEU*     1.3    62.0    +      -       -      +
    455B  VAL*     3.1    23.7    +      -       +      +
    456B  ILE*     3.1    21.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 453 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  ASN*     4.9     3.6    -      -       -      +
    329A  MET*     3.6    38.8    -      -       +      -
    424B  GLN*     3.9    32.5    -      -       +      +
    427B  THR*     4.0    21.5    -      -       +      -
    428B  LEU*     3.9    17.9    -      -       +      -
    449B  VAL*     2.8    29.7    +      -       +      +
    450B  HIS*     3.7     4.9    -      -       -      +
    451B  THR      3.3     0.2    -      -       -      -
    452B  HIS*     1.3    71.6    -      -       -      +
    454B  GLN*     1.3    58.6    +      -       +      +
    456B  ILE*     3.4     9.1    +      -       +      +
    457B  GLU*     3.1    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 454 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  ALA*     4.0    22.3    +      -       +      +
    336A  ASP*     3.4    25.7    +      -       -      +
    450B  HIS*     3.2    40.0    +      -       +      +
    451B  THR*     3.2    15.4    +      -       +      +
    453B  LEU*     1.3    75.8    -      -       +      +
    455B  VAL*     1.3    66.2    +      -       -      +
    457B  GLU*     3.7     7.2    -      -       -      +
    458B  GLU*     3.0    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 455 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    451B  THR*     3.0    27.8    +      -       +      +
    452B  HIS*     3.1    18.1    +      -       +      +
    454B  GLN*     1.3    75.7    -      -       +      +
    456B  ILE*     1.3    64.6    +      -       -      +
    458B  GLU*     3.3     7.3    +      -       -      +
    459B  ARG*     3.1    39.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 456 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    420B  GLU*     3.8    32.3    -      -       +      +
    423B  GLU*     3.7    18.4    -      -       +      -
    424B  GLN*     4.0    20.4    -      -       +      -
    427B  THR*     4.0     8.3    -      -       -      +
    452B  HIS*     3.1    36.3    +      -       +      +
    453B  LEU*     3.6    14.6    -      -       +      +
    455B  VAL*     1.3    76.6    -      -       +      +
    457B  GLU*     1.3    63.7    +      -       -      +
    459B  ARG*     3.1    36.3    +      -       -      +
    460B  VAL*     3.1    15.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 457 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    453B  LEU      3.1    16.3    +      -       -      +
    454B  GLN*     3.7     8.7    -      -       -      +
    455B  VAL      3.3     0.2    -      -       -      -
    456B  ILE*     1.3    77.9    -      -       -      +
    458B  GLU*     1.3    63.4    +      -       -      +
    460B  VAL*     3.4     8.6    +      -       -      +
    461B  ASN*     3.1    35.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 458 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454B  GLN      3.0    17.4    +      -       -      +
    455B  VAL*     3.6     7.0    -      -       -      +
    457B  GLU*     1.3    74.0    -      -       -      +
    459B  ARG*     1.3    65.4    +      -       -      +
    461B  ASN*     3.3    15.8    +      -       -      +
    462B  GLN*     3.0    47.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 459 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388B  ARG*     3.5    33.0    -      -       -      +
    416B  TYR*     3.7     5.8    -      -       -      +
    420B  GLU*     2.7    37.3    +      -       -      +
    423B  GLU*     2.7    33.9    +      -       -      -
    455B  VAL*     3.1    24.0    +      -       +      +
    456B  ILE*     3.1    23.2    +      -       -      +
    458B  GLU*     1.3    78.3    -      -       -      +
    460B  VAL*     1.3    57.1    +      -       -      +
    462B  GLN*     3.2     7.7    +      -       +      +
    463B  SER*     2.8    33.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 460 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    416B  TYR*     4.1     7.2    -      -       -      -
    417B  LEU*     3.7    26.0    -      -       +      -
    420B  GLU*     3.6    32.3    -      -       +      -
    456B  ILE*     3.1    16.9    +      -       +      +
    457B  GLU*     3.6    10.5    -      -       -      +
    458B  GLU      3.3     0.2    -      -       -      -
    459B  ARG*     1.3    76.9    -      -       -      +
    461B  ASN*     1.3    61.3    +      -       -      +
    463B  SER*     3.3     1.7    +      -       -      -
    464B  LEU*     2.8    47.0    +      -       +      +
    485B  LEU*     4.2     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 461 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    457B  GLU*     3.1    36.5    +      -       -      +
    458B  GLU*     3.8    17.0    +      -       -      +
    459B  ARG      3.3     0.2    -      -       -      -
    460B  VAL*     1.3    79.1    -      -       -      +
    462B  GLN*     1.3    52.9    +      -       -      +
    464B  LEU*     3.4    14.9    +      -       -      +
    465B  GLY*     2.8    30.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 462 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    458B  GLU*     3.0    42.1    +      -       +      +
    459B  ARG*     3.5     7.2    -      -       -      +
    461B  ASN*     1.3    74.6    -      -       -      +
    463B  SER*     1.3    66.4    +      -       -      +
    465B  GLY*     3.0    12.7    +      -       -      -
    466B  LEU*     3.2    13.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 463 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    392B  LEU*     4.1    11.3    -      -       -      +
    395B  PHE*     3.3    18.8    -      -       -      -
    413B  LEU*     5.7     0.4    -      -       -      -
    416B  TYR*     2.6    50.7    +      -       -      -
    459B  ARG*     2.8    13.1    +      -       -      +
    460B  VAL      3.7     1.1    -      -       -      -
    462B  GLN*     1.3    75.8    -      -       -      +
    464B  LEU*     1.3    63.2    +      -       -      +
    466B  LEU*     3.0    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 464 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    395B  PHE*     5.1     0.4    -      -       -      -
    413B  LEU*     3.7    39.3    -      -       +      -
    417B  LEU*     4.5     7.2    -      -       +      -
    460B  VAL*     2.8    32.7    +      -       +      +
    461B  ASN*     3.6    14.4    -      -       -      +
    463B  SER*     1.3    76.2    -      -       -      +
    465B  GLY*     1.3    55.4    +      -       -      +
    467B  LEU*     2.7    36.8    +      -       +      +
    468B  ASP*     3.5     7.5    +      -       -      +
    481B  ILE*     4.3    13.0    -      -       +      -
    485B  LEU*     3.7    35.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 465 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461B  ASN      2.8    16.2    +      -       -      -
    462B  GLN*     3.0     9.1    +      -       -      -
    464B  LEU*     1.3    76.7    -      -       -      +
    466B  LEU*     1.3    60.3    +      -       -      +
    468B  ASP*     3.0    30.9    +      -       -      +
    469B  GLN*     3.8     4.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 466 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    392B  LEU*     4.8     8.1    -      -       +      -
    395B  PHE*     4.1    11.9    -      -       +      -
    396B  LEU*     3.4    32.3    -      -       +      -
    399B  LEU*     3.6    21.5    -      -       +      +
    462B  GLN      3.2    12.0    +      -       -      +
    463B  SER*     3.0    23.0    +      -       -      +
    464B  LEU      2.9     0.8    +      -       -      -
    465B  GLY*     1.3    76.4    -      -       -      +
    467B  LEU*     1.3    59.1    +      -       -      +
    468B  ASP      3.6     0.2    +      -       -      -
    469B  GLN*     3.6    18.1    +      -       -      +
    470B  ASN*     5.6     1.0    -      -       -      +
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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