Contacts of the helix formed by residues 629 - 660 (chain B) in PDB entry 3A8P


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 629 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    627B  LYS*     4.4     4.2    -      -       +      +
    628B  GLU*     1.3    78.9    -      -       -      +
    630B  THR*     1.3    61.9    +      -       -      +
    631B  VAL*     3.6     9.5    +      -       -      +
    632B  ARG*     3.2    41.6    +      -       +      +
    633B  LEU*     3.1    20.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 630 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    618B  ALA*     3.6    30.5    +      -       +      +
    619B  SER*     4.5     6.2    -      -       -      +
    622B  ALA*     3.5    23.1    -      -       +      +
    628B  GLU      3.2     9.1    +      -       -      -
    629B  ASP*     1.3    72.8    +      -       -      +
    631B  VAL*     1.3    63.1    +      -       -      +
    633B  LEU*     3.2     4.7    +      -       +      +
    634B  LEU*     3.0    32.6    +      -       +      +
    699B  LEU*     3.7    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 631 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    629B  ASP*     3.4     7.5    +      -       -      +
    630B  THR*     1.3    75.7    -      -       -      +
    632B  ARG*     1.3    58.2    +      -       -      +
    634B  LEU*     3.3     3.4    +      -       -      +
    635B  LYS*     3.0    55.4    +      -       +      +
    696B  LEU*     4.2    12.1    -      -       +      -
    699B  LEU*     4.2    25.1    -      -       +      -
    700B  GLN*     3.8    22.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 632 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    629B  ASP*     3.2    34.9    +      -       +      +
    631B  VAL*     1.3    80.4    -      -       -      +
    633B  LEU*     1.3    62.2    +      -       -      +
    635B  LYS*     3.6     9.0    +      -       -      +
    636B  SER*     3.1    25.3    +      -       -      -
    639B  ARG*     4.9     4.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 633 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    621B  PHE*     3.9    19.1    -      -       +      -
    622B  ALA*     3.4    33.0    -      -       +      -
    625B  HIS*     3.6    29.4    -      -       +      -
    627B  LYS*     3.8    28.7    -      -       +      -
    629B  ASP      3.1    13.0    +      -       -      +
    630B  THR*     3.4     8.5    -      -       +      +
    632B  ARG*     1.3    78.0    -      -       -      +
    634B  LEU*     1.3    57.8    +      -       +      +
    636B  SER*     3.3     7.2    +      -       -      -
    637B  GLN*     2.9    38.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 634 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    618B  ALA*     4.3     1.8    -      -       +      -
    621B  PHE*     4.1    17.9    -      -       +      -
    630B  THR*     3.0    27.5    +      -       +      +
    631B  VAL      3.7     1.3    -      -       -      +
    633B  LEU*     1.3    76.2    -      -       +      +
    635B  LYS*     1.3    56.8    +      -       -      +
    637B  GLN*     3.2     6.9    +      -       -      +
    638B  THR*     2.9    35.0    +      -       -      +
    692B  MET*     3.7    26.9    -      -       -      +
    695B  TYR*     3.9    31.9    -      -       +      -
    696B  LEU*     3.5    31.2    -      -       +      +
    699B  LEU*     3.8    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 635 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631B  VAL*     3.0    43.0    +      -       +      +
    632B  ARG*     3.9     7.2    -      -       -      +
    634B  LEU*     1.3    75.7    -      -       -      +
    636B  SER*     1.3    62.5    +      -       -      +
    638B  THR*     2.6    22.7    +      -       -      -
    639B  ARG*     3.1    38.3    +      -       -      +
    696B  LEU*     4.1    18.3    -      -       +      +
    700B  GLN*     4.0    20.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 636 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632B  ARG*     3.1    20.3    +      -       -      -
    633B  LEU*     3.5    10.3    -      -       -      +
    634B  LEU      3.2     0.2    -      -       -      -
    635B  LYS*     1.3    74.9    -      -       -      +
    637B  GLN*     1.3    64.2    +      -       -      +
    639B  ARG*     3.0    20.6    +      -       -      +
    640B  SER*     3.1    23.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 637 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    621B  PHE*     4.0    30.6    -      -       +      -
    625B  HIS*     3.8    19.5    +      -       -      -
    633B  LEU*     2.9    24.6    +      -       +      +
    634B  LEU      3.2     7.8    +      -       -      +
    636B  SER*     1.3    76.2    -      -       -      +
    638B  THR*     1.3    57.3    +      -       -      +
    640B  SER*     3.3     8.3    +      -       -      -
    641B  LEU*     2.9    47.7    +      -       +      +
    692B  MET*     3.8    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 638 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634B  LEU      2.9    14.3    +      -       -      +
    635B  LYS*     2.6    24.9    +      -       -      -
    637B  GLN*     1.3    76.6    -      -       -      +
    639B  ARG*     1.3    57.1    +      -       -      +
    641B  LEU*     3.4     3.6    +      -       -      +
    642B  LEU*     2.9    39.5    +      -       -      +
    689B  LEU*     3.9    21.9    -      -       +      +
    692B  MET*     3.4    28.7    -      -       +      -
    693B  ARG*     4.6     7.0    -      -       +      +
    696B  LEU*     4.5    14.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 639 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632B  ARG*     4.9     4.4    +      -       -      +
    635B  LYS*     3.1    41.3    +      -       -      +
    636B  SER*     3.0    38.9    -      -       -      +
    638B  THR*     1.3    77.5    +      -       -      +
    640B  SER*     1.3    63.4    +      -       -      +
    642B  LEU*     3.4    10.8    +      -       +      +
    643B  GLN*     3.0    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 640 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    636B  SER*     3.1    15.8    +      -       -      -
    637B  GLN*     3.5    10.5    +      -       -      -
    639B  ARG*     1.3    81.6    -      -       -      +
    641B  LEU*     1.3    63.0    +      -       -      +
    643B  GLN*     3.0    23.5    +      -       -      +
    644B  LYS*     3.1    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 641 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    637B  GLN*     2.9    33.6    +      -       -      +
    638B  THR*     3.8     4.9    -      -       -      +
    639B  ARG      3.3     0.2    -      -       -      -
    640B  SER*     1.3    76.3    -      -       -      +
    642B  LEU*     1.3    58.3    +      -       -      +
    644B  LYS*     3.2    11.2    +      -       +      +
    645B  ILE*     2.9    35.3    +      -       -      +
    685B  PHE*     4.1    30.3    -      -       +      +
    688B  ASP*     3.8    26.9    -      -       +      +
    689B  LEU*     3.6    38.6    -      -       +      +
    692B  MET*     4.0    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 642 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    638B  THR*     2.9    26.7    +      -       -      +
    639B  ARG*     3.7     9.4    -      -       +      +
    641B  LEU*     1.3    77.5    -      -       -      +
    643B  GLN*     1.3    58.2    +      -       -      +
    645B  ILE*     3.8    10.6    -      -       +      +
    646B  ASP*     2.9    29.3    +      -       -      +
    686B  HIS*     6.3     0.2    -      -       +      -
    689B  LEU*     3.7    29.2    -      -       +      -
    693B  ARG*     4.0    21.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 643 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    639B  ARG      3.0    13.2    +      -       -      +
    640B  SER*     3.0    17.4    +      -       -      +
    642B  LEU*     1.3    78.7    -      -       -      +
    644B  LYS*     1.3    62.1    +      -       +      +
    646B  ASP*     3.2     7.6    +      -       -      +
    647B  MET*     3.0    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 644 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    640B  SER*     3.1    27.4    +      -       -      +
    641B  LEU*     3.2    13.6    +      -       +      +
    643B  GLN*     1.3    79.7    -      -       +      +
    645B  ILE*     1.3    61.4    +      -       -      +
    647B  MET*     3.4     6.6    +      -       -      +
    648B  ASP*     3.0    30.1    +      -       -      +
    685B  PHE*     3.4    43.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 645 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    641B  LEU      2.9    22.3    +      -       -      +
    642B  LEU*     3.8    11.4    -      -       +      +
    644B  LYS*     1.3    73.2    -      -       -      +
    646B  ASP*     1.3    66.8    +      -       -      +
    649B  SER*     2.9    38.9    +      -       -      +
    682B  LEU*     3.9    10.9    -      -       +      +
    685B  PHE*     3.4    37.2    -      -       +      +
    686B  HIS*     3.7    33.7    -      -       +      +
    689B  LEU*     3.8    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 646 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    642B  LEU      2.9    19.7    +      -       -      +
    643B  GLN*     3.2     8.3    +      -       -      +
    645B  ILE*     1.3    78.1    -      -       -      +
    647B  MET*     1.3    66.3    +      -       -      +
    649B  SER*     3.7     3.8    -      -       -      -
    650B  LYS*     3.0    62.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 647 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    643B  GLN*     3.0    17.0    +      -       +      +
    644B  LYS*     3.7     7.0    -      -       -      +
    645B  ILE      3.3     0.2    -      -       -      -
    646B  ASP*     1.3    80.7    +      -       -      +
    648B  ASP*     1.3    72.6    +      -       -      +
    650B  LYS*     4.6    11.7    -      -       +      -
    651B  MET*     3.0    51.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 648 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    644B  LYS*     3.0    16.3    +      -       -      +
    647B  MET*     1.3    85.0    -      -       -      +
    649B  SER*     1.3    57.5    +      -       -      +
    651B  MET*     3.6     4.4    +      -       -      +
    652B  LYS*     2.9    29.7    +      -       -      +
    678B  TRP*     3.6    29.1    +      -       +      +
    681B  ASN*     3.3    34.0    +      -       -      +
    682B  LEU*     4.1    20.2    -      -       +      -
    685B  PHE*     3.5    10.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 649 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645B  ILE*     2.9    30.2    +      -       -      +
    646B  ASP*     3.7     4.5    -      -       -      -
    648B  ASP*     1.3    74.9    -      -       -      +
    650B  LYS*     1.3    61.9    +      -       -      +
    652B  LYS*     3.0     8.5    +      -       -      +
    653B  LYS*     2.8    29.9    +      -       -      +
    682B  LEU*     3.7    18.7    -      -       -      +
    686B  HIS*     5.3     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 650 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    646B  ASP*     3.0    48.9    +      -       -      +
    647B  MET*     3.8    12.8    -      -       +      +
    649B  SER*     1.3    77.0    -      -       -      +
    651B  MET*     1.3    58.2    +      -       +      +
    653B  LYS*     3.2    14.6    +      -       -      +
    654B  MET*     2.9    33.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 651 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647B  MET*     3.0    48.3    +      -       +      +
    648B  ASP*     4.0     3.8    -      -       -      +
    650B  LYS*     1.3    76.4    -      -       -      +
    652B  LYS*     1.3    57.5    +      -       -      +
    654B  MET*     3.6     7.6    -      -       -      +
    655B  ALA*     2.9    29.8    +      -       -      +
    678B  TRP*     3.4    36.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 652 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    648B  ASP      2.9    18.4    +      -       -      +
    649B  SER*     3.3     6.5    -      -       -      +
    651B  MET*     1.3    75.8    -      -       -      +
    653B  LYS*     1.3    60.3    +      -       -      +
    655B  ALA*     3.3     2.3    +      -       -      +
    656B  GLU*     2.9    60.3    +      -       +      +
    675B  ILE*     4.4     9.0    -      -       +      -
    678B  TRP*     3.6    27.1    -      -       +      -
    679B  GLU*     3.5    34.6    +      -       +      -
    682B  LEU*     3.8    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 653 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    649B  SER      2.8    12.9    +      -       -      +
    650B  LYS*     3.2    15.9    +      -       -      +
    652B  LYS*     1.3    73.6    -      -       -      +
    654B  MET*     1.3    78.1    +      -       -      +
    656B  GLU*     2.9    17.7    +      -       -      +
    657B  LEU*     2.9    56.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 654 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    650B  LYS*     2.9    18.6    +      -       +      +
    651B  MET*     3.6     9.0    -      -       -      +
    653B  LYS*     1.3    89.3    -      -       -      +
    655B  ALA*     1.3    58.1    +      -       -      +
    657B  LEU*     3.1    38.6    +      -       +      +
    658B  GLN*     2.9    33.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 655 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    651B  MET      2.9    19.6    +      -       -      +
    652B  LYS      3.5     4.3    -      -       -      +
    653B  LYS      3.2     0.2    -      -       -      -
    654B  MET*     1.3    76.7    -      -       -      +
    656B  GLU*     1.3    56.9    +      -       -      +
    658B  GLN*     3.2     7.2    +      -       -      +
    659B  LEU      3.0    23.9    +      -       -      -
    671B  ILE*     3.5    22.2    -      -       +      +
    674B  GLN*     5.8     0.2    -      -       +      -
    675B  ILE*     4.0    11.7    -      -       +      -
    678B  TRP*     3.5    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 656 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    652B  LYS*     2.9    57.9    +      -       -      +
    653B  LYS*     2.9    18.0    +      -       +      +
    655B  ALA*     1.3    75.9    -      -       -      +
    657B  LEU*     1.3    65.5    +      -       +      +
    659B  LEU*     3.4    17.2    +      -       +      +
    660B  SER*     3.5     8.0    +      -       -      -
    675B  ILE*     3.6    25.2    -      -       +      +
    679B  GLU*     5.6     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 657 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653B  LYS*     2.9    49.3    +      -       +      +
    654B  MET*     3.3    38.4    -      -       +      +
    656B  GLU*     1.3    77.6    -      -       +      +
    658B  GLN*     1.3    62.7    +      -       -      +
    660B  SER*     2.5    27.8    +      -       -      -
    661B  VAL*     3.8     6.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 658 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    654B  MET*     2.9    16.6    +      -       -      +
    655B  ALA*     3.2    11.9    +      -       -      +
    657B  LEU*     1.3    77.9    -      -       -      +
    659B  LEU*     1.3    62.6    +      -       -      +
    661B  VAL*     3.1    24.5    +      -       -      +
    662B  VAL*     3.0    25.1    +      -       -      +
    671B  ILE*     3.9    13.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 659 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    655B  ALA      3.0    12.8    +      -       -      +
    656B  GLU*     3.5    13.0    -      -       +      +
    657B  LEU      3.2     0.2    -      -       -      -
    658B  GLN*     1.3    78.9    -      -       -      +
    660B  SER*     1.3    60.5    +      -       -      +
    662B  VAL*     3.2     7.0    -      -       +      +
    668B  ARG*     2.7    70.5    +      -       +      +
    671B  ILE*     4.1    10.7    -      -       +      +
    672B  GLU*     3.0    33.0    -      -       +      +
    675B  ILE*     4.5    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 660 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    656B  GLU      3.5     7.6    +      -       -      -
    657B  LEU*     2.5    24.8    +      -       -      -
    659B  LEU*     1.3    79.2    -      -       -      +
    661B  VAL*     1.3    66.8    +      -       -      +
    662B  VAL      3.7     0.4    -      -       -      -
    668B  ARG*     5.0     2.5    -      -       -      +
----------------------------------------------------------
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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