Contacts of the helix formed by residues 629 - 660 (chain D) 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 D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    627D  LYS*     4.5     5.4    -      -       +      +
    628D  GLU*     1.3    75.0    -      -       -      +
    630D  THR*     1.3    63.4    +      -       -      +
    631D  VAL*     3.4     8.3    +      -       -      +
    632D  ARG*     3.0    42.2    +      -       +      +
    633D  LEU*     3.1    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 630 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    618D  ALA*     3.5    30.7    +      -       +      +
    619D  SER*     4.5     6.0    -      -       -      +
    622D  ALA*     3.6    21.3    -      -       +      +
    628D  GLU      3.2     8.7    +      -       -      -
    629D  ASP*     1.3    72.5    +      -       -      +
    631D  VAL*     1.3    64.2    +      -       -      +
    633D  LEU*     3.1     5.1    +      -       +      +
    634D  LEU*     2.9    32.7    +      -       +      +
    699D  LEU*     3.7    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 631 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    629D  ASP*     3.4     6.6    +      -       -      +
    630D  THR*     1.3    78.0    -      -       -      +
    632D  ARG*     1.3    58.8    +      -       -      +
    634D  LEU*     3.3     9.9    +      -       -      +
    635D  LYS*     2.9    55.0    +      -       +      +
    696D  LEU*     4.3     5.4    -      -       +      -
    699D  LEU*     4.4    19.3    -      -       +      -
    700D  GLN*     3.9    25.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 632 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    629D  ASP*     3.0    39.2    +      -       -      +
    631D  VAL*     1.3    77.3    -      -       -      +
    633D  LEU*     1.3    60.5    +      -       -      +
    635D  LYS*     3.9     6.6    -      -       -      +
    636D  SER*     2.9    32.4    +      -       -      -
    639D  ARG*     4.7     4.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 633 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    621D  PHE*     4.0    15.7    -      -       +      -
    622D  ALA*     3.4    33.4    -      -       +      -
    625D  HIS*     3.5    40.8    -      -       +      -
    627D  LYS*     4.0    25.4    -      -       +      +
    629D  ASP      3.1    10.9    +      -       -      +
    630D  THR*     3.1     7.7    +      -       -      +
    632D  ARG*     1.3    74.0    -      -       -      +
    634D  LEU*     1.3    56.4    +      -       +      +
    636D  SER*     3.1     9.9    +      -       -      +
    637D  GLN*     2.7    46.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 634 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    618D  ALA*     4.3     1.3    -      -       +      -
    621D  PHE*     4.1    14.4    -      -       +      -
    630D  THR*     2.9    25.7    +      -       +      +
    631D  VAL*     3.6     2.5    -      -       -      +
    633D  LEU*     1.3    77.0    -      -       -      +
    635D  LYS*     1.3    62.2    +      -       -      +
    637D  GLN*     3.2     6.4    +      -       -      +
    638D  THR*     2.9    28.5    +      -       -      +
    692D  MET*     3.8    25.3    -      -       -      +
    695D  TYR*     3.7    38.1    -      -       +      -
    696D  LEU*     3.4    33.0    -      -       +      +
    699D  LEU*     3.9    23.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 635 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631D  VAL*     2.9    39.1    +      -       +      +
    632D  ARG*     4.0     6.1    -      -       -      +
    634D  LEU*     1.3    75.8    -      -       -      +
    636D  SER*     1.3    64.1    +      -       -      +
    638D  THR*     2.7    25.4    +      -       -      +
    639D  ARG*     2.9    33.8    +      -       -      +
    696D  LEU*     3.9    15.9    -      -       +      -
    700D  GLN*     3.8    17.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 636 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632D  ARG*     2.9    22.4    +      -       -      -
    633D  LEU*     3.3    12.5    -      -       -      +
    635D  LYS*     1.3    76.3    -      -       -      +
    637D  GLN*     1.3    64.9    +      -       -      +
    639D  ARG*     3.4    21.7    +      -       -      +
    640D  SER*     3.2    21.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 637 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    621D  PHE*     3.8    34.4    -      -       +      -
    625D  HIS*     4.4    13.4    +      -       -      -
    633D  LEU*     2.7    31.9    +      -       +      +
    634D  LEU      3.4     5.6    -      -       -      +
    635D  LYS      3.1     0.2    -      -       -      -
    636D  SER*     1.3    76.8    +      -       -      +
    638D  THR*     1.3    56.8    +      -       -      +
    640D  SER*     3.3    10.7    +      -       -      -
    641D  LEU*     3.0    42.6    +      -       +      +
    692D  MET*     3.7    15.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 638 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634D  LEU      2.9    15.4    +      -       -      +
    635D  LYS*     2.7    20.8    +      -       -      +
    637D  GLN*     1.3    71.9    -      -       -      +
    639D  ARG*     1.3    66.2    +      -       -      +
    641D  LEU*     3.3     4.2    +      -       -      +
    642D  LEU*     2.9    34.4    +      -       -      +
    689D  LEU*     3.9    21.6    -      -       +      +
    692D  MET*     3.5    25.6    -      -       +      -
    693D  ARG*     4.7     5.2    -      -       +      +
    696D  LEU*     3.9    19.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 639 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632D  ARG*     4.7     4.8    +      -       -      +
    635D  LYS*     2.9    30.7    +      -       -      +
    636D  SER*     3.4    33.0    -      -       -      +
    638D  THR*     1.3    79.8    +      -       -      +
    640D  SER*     1.3    62.0    +      -       -      +
    642D  LEU*     3.3    10.8    +      -       -      +
    643D  GLN*     3.1    38.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 640 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    636D  SER      3.2    10.1    +      -       -      -
    637D  GLN*     3.5    15.7    -      -       -      -
    638D  THR      3.3     0.2    -      -       -      -
    639D  ARG*     1.3    81.6    -      -       -      +
    641D  LEU*     1.3    63.8    +      -       -      +
    643D  GLN*     3.2    13.0    +      -       -      +
    644D  LYS*     3.1    43.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 641 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    637D  GLN*     3.0    33.1    +      -       +      +
    638D  THR*     3.3     5.6    +      -       -      +
    640D  SER*     1.3    75.4    -      -       -      +
    642D  LEU*     1.3    60.9    +      -       -      +
    644D  LYS*     3.3     9.2    +      -       +      +
    645D  ILE*     2.8    37.0    +      -       -      +
    685D  PHE*     4.1    28.0    -      -       +      +
    688D  ASP*     3.7    26.9    -      -       +      +
    689D  LEU*     3.5    41.5    -      -       +      +
    692D  MET*     3.9    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 642 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    638D  THR*     2.9    27.6    +      -       -      +
    639D  ARG*     3.5     9.2    -      -       -      +
    641D  LEU*     1.3    77.0    -      -       -      +
    643D  GLN*     1.3    58.0    +      -       +      +
    645D  ILE*     3.9     7.9    -      -       +      +
    646D  ASP*     3.0    30.3    +      -       -      +
    689D  LEU*     3.6    29.8    -      -       +      -
    693D  ARG*     4.1    19.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 643 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    639D  ARG*     3.1    28.0    +      -       +      +
    640D  SER*     3.5     9.9    +      -       -      +
    641D  LEU      3.2     0.2    -      -       -      -
    642D  LEU*     1.3    79.4    -      -       +      +
    644D  LYS*     1.3    61.9    +      -       +      +
    646D  ASP*     3.4     6.0    +      -       -      +
    647D  MET*     3.0    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 644 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    640D  SER*     3.1    29.2    +      -       -      +
    641D  LEU*     3.7    12.4    -      -       +      +
    643D  GLN*     1.3    74.4    -      -       +      +
    645D  ILE*     1.3    61.8    +      -       -      +
    647D  MET*     3.4     4.6    +      -       -      +
    648D  ASP*     2.9    35.1    +      -       -      +
    685D  PHE*     3.8    43.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 645 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    641D  LEU      2.8    22.6    +      -       -      +
    642D  LEU*     3.9     8.7    -      -       +      +
    644D  LYS*     1.3    76.1    -      -       -      +
    646D  ASP*     1.3    53.7    +      -       -      +
    649D  SER*     2.7    43.7    +      -       -      +
    682D  LEU*     3.7    13.6    -      -       +      +
    685D  PHE*     3.6    32.3    -      -       +      +
    686D  HIS*     3.4    38.1    -      -       +      +
    689D  LEU*     3.7    31.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 646 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    642D  LEU      3.0    19.4    +      -       -      +
    643D  GLN*     3.6     7.4    -      -       -      +
    644D  LYS      3.3     0.2    -      -       -      -
    645D  ILE*     1.3    78.0    -      -       -      +
    647D  MET*     1.3    61.2    +      -       -      +
    649D  SER*     3.0    18.3    +      -       -      -
    650D  LYS*     3.1    50.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 647 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    643D  GLN      3.0    17.1    +      -       -      +
    644D  LYS*     3.9     4.7    -      -       -      +
    646D  ASP*     1.3    77.2    +      -       -      +
    648D  ASP*     1.3    62.7    +      -       -      +
    650D  LYS*     3.3    20.4    +      -       -      +
    651D  MET*     2.9    53.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 648 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    644D  LYS*     2.9    23.2    +      -       -      +
    647D  MET*     1.3    78.1    -      -       -      +
    649D  SER*     1.3    60.3    +      -       -      +
    651D  MET*     3.9     8.5    -      -       -      +
    652D  LYS*     3.0    28.8    +      -       -      +
    678D  TRP*     3.8    21.6    +      -       +      -
    681D  ASN*     3.8    22.0    +      -       -      +
    682D  LEU*     3.8    19.2    -      -       +      +
    685D  PHE*     3.8    20.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 649 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645D  ILE*     2.7    29.0    +      -       -      +
    646D  ASP*     3.0    13.7    +      -       -      -
    648D  ASP*     1.3    77.9    -      -       -      +
    650D  LYS*     1.3    59.8    +      -       -      +
    652D  LYS*     3.2     5.8    +      -       -      +
    653D  LYS*     2.9    27.5    +      -       -      +
    682D  LEU*     3.8    21.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 650 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    646D  ASP*     3.1    49.2    +      -       -      +
    647D  MET*     3.7    19.2    -      -       -      +
    649D  SER*     1.3    83.0    +      -       -      +
    651D  MET*     1.3    65.1    +      -       +      +
    653D  LYS*     2.6    55.5    +      -       +      +
    654D  MET*     3.0     4.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 651 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647D  MET*     2.9    45.8    +      -       -      +
    648D  ASP*     4.0     8.5    -      -       -      +
    650D  LYS*     1.3    77.1    -      -       +      +
    652D  LYS*     1.3    61.3    +      -       -      +
    654D  MET*     3.2     9.4    +      -       -      +
    655D  ALA*     3.1    22.2    +      -       -      +
    678D  TRP*     3.5    39.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 652 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    648D  ASP      3.0    18.7    +      -       -      +
    649D  SER*     3.3     6.1    -      -       -      +
    650D  LYS      3.1     0.2    -      -       -      -
    651D  MET*     1.3    75.5    -      -       -      +
    653D  LYS*     1.3    64.3    +      -       -      +
    655D  ALA      3.2     1.6    +      -       -      -
    656D  GLU*     2.9    57.6    +      -       -      +
    675D  ILE*     3.5    16.6    -      -       +      +
    678D  TRP*     3.9    28.0    -      -       +      -
    679D  GLU*     3.4    36.5    +      -       +      +
    682D  LEU*     4.0    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 653 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    649D  SER      2.9    10.8    +      -       -      +
    650D  LYS*     2.6    59.4    +      -       +      +
    652D  LYS*     1.3    76.9    -      -       -      +
    654D  MET*     1.3    83.6    +      -       -      +
    656D  GLU*     3.1    16.7    +      -       -      +
    657D  LEU*     2.8    41.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 654 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    650D  LYS      3.0     7.6    +      -       -      +
    651D  MET*     3.5    13.7    -      -       +      +
    652D  LYS      3.2     0.2    -      -       -      -
    653D  LYS*     1.3   101.0    -      -       -      +
    655D  ALA*     1.3    56.2    +      -       -      +
    657D  LEU*     3.6    18.0    +      -       +      +
    658D  GLN*     3.1    29.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 655 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    651D  MET      3.1     5.1    +      -       -      +
    652D  LYS      3.6     1.8    -      -       -      +
    653D  LYS      3.1     0.8    -      -       -      -
    654D  MET*     1.3    75.2    -      -       -      +
    656D  GLU*     1.3    59.8    +      -       -      +
    657D  LEU      3.1     1.3    -      -       -      -
    658D  GLN*     3.1     9.7    +      -       -      +
    659D  LEU      2.8    22.9    +      -       -      -
    671D  ILE*     2.9    23.7    -      -       +      +
    675D  ILE*     3.2    22.2    -      -       +      -
    678D  TRP*     3.4    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 656 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    652D  LYS*     2.9    45.0    +      -       -      +
    653D  LYS*     3.6    16.4    -      -       -      +
    655D  ALA*     1.3    76.3    -      -       -      +
    657D  LEU*     1.3    59.8    +      -       +      +
    659D  LEU*     3.1    14.1    +      -       +      +
    660D  SER*     2.9    26.9    +      -       -      -
    671D  ILE*     4.4     0.2    -      -       -      -
    675D  ILE*     3.4    23.0    -      -       +      +
    679D  GLU*     5.2     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 657 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653D  LYS*     2.8    24.5    +      -       +      +
    654D  MET*     3.7    23.8    -      -       +      +
    656D  GLU*     1.3    78.9    -      -       +      +
    658D  GLN*     1.3    64.2    +      -       -      +
    660D  SER*     2.5    29.6    +      -       -      +
    661D  VAL*     3.6     9.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 658 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    654D  MET*     3.1    20.3    +      -       +      +
    655D  ALA*     3.1    14.4    -      -       -      +
    657D  LEU*     1.3    75.2    -      -       -      +
    659D  LEU*     1.3    62.1    +      -       -      +
    661D  VAL*     3.2    18.5    +      -       -      +
    662D  VAL*     3.1    31.9    +      -       +      +
    671D  ILE*     4.5     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 659 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    655D  ALA      2.8    12.4    +      -       -      +
    656D  GLU*     3.2    15.3    -      -       +      +
    657D  LEU      3.1     0.2    -      -       -      -
    658D  GLN*     1.3    73.7    -      -       -      +
    660D  SER*     1.3    57.1    +      -       -      +
    661D  VAL      2.9    11.3    +      -       -      -
    662D  VAL*     3.1    18.3    +      -       -      +
    668D  ARG*     3.4    53.6    +      -       +      +
    671D  ILE*     3.3    35.2    -      -       +      +
    672D  GLU*     3.9    22.4    -      -       +      +
    675D  ILE*     5.5     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 660 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    656D  GLU      2.9    12.7    +      -       -      -
    657D  LEU*     2.5    33.6    +      -       -      +
    659D  LEU*     1.3    74.6    -      -       -      +
    661D  VAL*     1.3    68.7    +      -       -      +
    668D  ARG*     5.6     0.2    -      -       -      +
----------------------------------------------------------
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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