Contacts of the helix formed by residues 1 - 32 (chain B) in PDB entry 2G9J


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 MET 1 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     4.0     9.2    -      -       +      -
      0B  GLY*     1.3    66.1    -      -       -      -
      2B  ASP*     1.3    66.4    +      -       -      +
      3B  ALA*     3.0    16.2    +      -       -      -
      4B  ILE*     3.4    24.7    -      -       +      +
      5B  LYS*     3.0    34.9    +      -       +      +
    270C  ILE*     4.9     7.2    -      -       +      -
    273C  GLU*     3.9     9.1    +      -       +      +
    274C  LEU*     5.8     3.6    -      -       +      -
    277C  ALA*     4.7     8.9    -      -       +      +
    278C  LEU*     5.5     1.8    -      -       +      -
    274D  LEU*     3.5    45.5    -      -       +      +
    275D  ASP*     6.3     0.7    -      -       -      -
    278D  LEU*     4.2     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 2 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      0B  GLY      2.9    11.8    +      -       -      +
      1B  MET*     1.3    71.8    -      -       -      +
      3B  ALA*     1.3    67.5    +      -       -      +
      5B  LYS*     4.3     5.2    -      -       -      -
      6B  LYS*     2.6    64.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 3 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  MET*     3.0    11.8    +      -       -      -
      2B  ASP*     1.3    80.5    -      -       -      +
      4B  ILE*     1.3    59.4    +      -       -      +
      6B  LYS*     4.2     1.2    -      -       -      +
      7B  LYS*     2.9    39.4    +      -       -      +
    278D  LEU*     3.5    30.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 4 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     4.9     5.6    -      -       -      -
      4A  ILE*     3.3    42.8    -      -       +      -
      1B  MET*     3.4    28.3    -      -       +      +
      3B  ALA*     1.3    73.2    -      -       -      +
      5B  LYS*     1.3    63.8    +      -       +      +
      7B  LYS*     4.1     6.5    -      -       -      -
      8B  MET*     2.7    31.5    +      -       -      +
    278C  LEU*     3.5     6.1    -      -       +      -
    281C  MET*     3.3    33.2    -      -       +      -
    284C  ILE*     4.3     2.9    -      -       +      -
    278D  LEU*     3.4    24.7    -      -       +      -
    284D  ILE*     4.2     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 5 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      0B  GLY*     4.8     5.8    -      -       -      -
      1B  MET*     3.0    49.0    +      -       +      +
      2B  ASP*     3.8     5.2    -      -       -      +
      4B  ILE*     1.3    85.1    -      -       +      +
      6B  LYS*     1.3    63.9    +      -       +      +
      8B  MET*     3.7     9.6    -      -       -      +
      9B  GLN*     3.3    17.7    +      -       -      +
    277C  ALA*     3.0    37.2    +      -       +      +
    278C  LEU*     5.5     0.2    -      -       -      -
    280C  ASP*     5.4     2.4    -      -       -      +
    281C  MET*     3.0    37.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 6 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2B  ASP*     2.6    48.5    +      -       -      +
      3B  ALA      4.2     1.1    -      -       -      +
      5B  LYS*     1.3    79.5    -      -       +      +
      7B  LYS*     1.3    60.2    +      -       -      +
      9B  GLN*     3.3    17.7    +      -       -      +
     10B  MET*     3.0    30.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 7 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3B  ALA*     2.9    29.8    +      -       -      +
      4B  ILE*     3.9     5.8    -      -       -      +
      6B  LYS*     1.3    76.0    -      -       -      +
      8B  MET*     1.3    53.9    +      -       -      +
     10B  MET*     3.3    19.1    +      -       -      +
     11B  LEU*     2.6    35.4    +      -       -      +
    278D  LEU*     4.9     4.7    -      -       -      -
    281D  MET*     4.4     8.3    -      -       +      -
    282D  THR*     2.8    44.9    +      -       -      +
    283D  SER*     4.1     0.9    -      -       -      -
    284D  ILE*     3.3    38.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 8 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4B  ILE*     2.7    23.3    +      -       +      +
      5B  LYS*     3.7     9.9    -      -       -      +
      7B  LYS*     1.3    69.7    -      -       -      +
      9B  GLN*     1.3    65.4    +      -       +      +
     11B  LEU*     3.1    19.1    -      -       +      +
     12B  LYS*     2.9    61.0    +      -       -      +
    281C  MET*     3.3    39.0    -      -       +      +
    284C  ILE*     4.0    22.0    -      -       +      -
    284D  ILE*     4.4     2.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 9 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  LYS      3.3    10.3    +      -       -      +
      6B  LYS*     3.4    20.2    -      -       -      +
      8B  MET*     1.3    84.2    -      -       +      +
     10B  MET*     1.3    57.4    +      -       -      +
     12B  LYS*     3.8     2.5    -      -       -      +
     13B  LEU*     2.9    55.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 10 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  LYS*     3.0    16.5    +      -       +      +
      7B  LYS*     3.5    21.1    -      -       +      +
      9B  GLN*     1.3    75.5    -      -       -      +
     11B  LEU*     1.3    62.8    +      -       -      +
     13B  LEU*     3.5    10.7    +      -       -      +
     14B  ASP*     3.1    24.3    +      -       +      +
    284D  ILE      6.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 11 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  LEU*     3.4    40.6    -      -       +      -
     15A  ASN*     3.9     8.1    -      -       -      +
      7B  LYS      2.6    21.4    +      -       -      +
      8B  MET*     3.1    27.6    -      -       +      +
     10B  MET*     1.3    76.5    -      -       -      +
     12B  LYS*     1.3    67.7    +      -       +      +
     14B  ASP*     3.1     3.5    +      -       -      +
     15B  ASN*     2.8    52.2    +      -       -      +
    284C  ILE*     4.2     5.8    -      -       +      -
    284D  ILE*     3.3    37.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 12 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  LEU*     5.8     3.1    -      -       +      -
      8B  MET*     2.9    54.5    +      -       -      +
      9B  GLN*     4.3     2.5    -      -       -      +
     11B  LEU*     1.3    82.2    -      -       +      +
     13B  LEU*     1.3    57.3    +      -       -      +
     15B  ASN*     4.2     7.9    -      -       +      +
     16B  TYR*     2.7    63.8    +      -       +      +
    283C  SER*     3.1    31.7    +      -       -      +
    284C  ILE*     3.9     4.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 13 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9B  GLN*     2.9    49.9    +      -       +      +
     10B  MET*     3.7     8.1    -      -       -      +
     12B  LYS*     1.3    78.0    -      -       -      +
     14B  ASP*     1.3    60.9    +      -       -      +
     16B  TYR*     3.9     5.8    -      -       +      +
     17B  HIS*     3.2    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 14 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10B  MET*     3.1    15.2    +      -       +      +
     11B  LEU*     3.5     8.5    -      -       -      +
     13B  LEU*     1.3    75.5    -      -       -      +
     15B  ASN*     1.3    74.1    +      -       -      +
     17B  HIS*     2.7    48.2    +      -       -      -
     18B  LEU*     3.0    18.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 15 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15A  ASN*     3.2    36.6    +      -       -      +
     18A  LEU*     4.4    11.7    -      -       +      +
     11B  LEU*     2.8    50.9    +      -       -      +
     12B  LYS*     4.2     9.6    -      -       +      +
     14B  ASP*     1.3    85.9    +      -       -      +
     16B  TYR*     1.3    52.8    +      -       +      +
     18B  LEU*     3.2    17.5    +      -       -      +
     19B  GLU*     2.7    39.1    +      -       -      +
    284D  ILE*     5.1     0.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 16 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  LYS*     2.7    58.7    +      -       +      +
     13B  LEU*     3.9     7.0    -      -       +      +
     15B  ASN*     1.3    73.4    -      -       +      +
     17B  HIS*     1.3    59.2    +      -       -      +
     19B  GLU*     3.1    29.3    -      -       -      +
     20B  ASN*     2.8    48.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 17 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13B  LEU      3.2    10.6    +      -       -      +
     14B  ASP*     2.7    54.0    +      -       -      -
     16B  TYR*     1.3    78.6    -      -       -      +
     18B  LEU*     1.3    66.7    +      -       +      +
     20B  ASN*     3.8     6.8    -      -       -      +
     21B  GLU*     3.0    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 18 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  LEU*     3.8    29.8    -      -       +      +
     19A  GLU*     4.1    23.1    -      -       +      -
     22A  VAL*     3.9    26.1    -      -       +      +
     14B  ASP*     3.0    22.6    +      -       -      +
     15B  ASN*     3.3    20.2    -      -       -      +
     16B  TYR      3.1     0.2    -      -       -      -
     17B  HIS*     1.3    85.8    +      -       +      +
     19B  GLU*     1.3    64.1    +      -       -      +
     21B  GLU*     3.2     9.5    +      -       -      +
     22B  VAL*     2.8    33.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 19 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  LEU*     4.9    17.6    -      -       +      +
     15B  ASN*     2.7    19.1    +      -       -      +
     16B  TYR*     3.1    54.4    +      -       -      +
     18B  LEU*     1.3    72.6    -      -       -      +
     20B  ASN*     1.3    63.4    +      -       -      +
     22B  VAL*     3.2    13.4    -      -       +      +
     23B  ALA*     2.9    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 20 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  TYR*     2.8    45.1    +      -       -      +
     17B  HIS*     3.8     7.6    -      -       -      +
     19B  GLU*     1.3    79.4    +      -       -      +
     21B  GLU*     1.3    64.3    +      -       -      +
     23B  ALA*     3.8     3.6    -      -       -      +
     24B  ARG*     2.8    64.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 21 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  VAL*     3.8     8.9    -      -       +      +
     26A  LYS*     2.7    37.2    +      -       -      -
     17B  HIS*     3.0    23.0    +      -       -      +
     18B  LEU*     3.2     9.2    +      -       -      +
     20B  ASN*     1.3    76.0    -      -       -      +
     22B  VAL*     1.3    52.8    +      -       -      +
     24B  ARG*     3.2     7.8    +      -       -      +
     25B  LEU*     2.6    43.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 22 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  LEU*     4.8     8.7    -      -       +      +
     21A  GLU*     3.7    22.9    -      -       +      +
     22A  VAL*     3.6    36.8    -      -       +      +
     25A  LEU*     3.8    10.3    -      -       +      -
     18B  LEU*     2.8    26.7    +      -       +      +
     19B  GLU*     3.2    20.2    -      -       +      +
     21B  GLU*     1.3    73.6    -      -       -      +
     23B  ALA*     1.3    57.8    +      -       +      +
     25B  LEU*     3.8     6.1    -      -       -      -
     26B  LYS*     2.7    44.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 23 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  GLU      2.9    20.4    +      -       -      +
     20B  ASN*     3.8     6.1    -      -       -      +
     22B  VAL*     1.3    77.2    -      -       +      +
     24B  ARG*     1.3    61.8    +      -       +      +
     26B  LYS*     3.1    29.5    -      -       +      +
     27B  LYS*     3.1    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 24 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20B  ASN*     2.8    52.4    +      -       -      +
     21B  GLU*     3.8     4.7    -      -       -      +
     23B  ALA*     1.3    77.6    -      -       +      +
     25B  LEU*     1.3    57.4    +      -       -      +
     27B  LYS*     3.3    11.7    -      -       +      +
     28B  LEU*     3.1    35.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 25 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  VAL*     4.0    16.2    -      -       +      +
     25A  LEU*     3.8    17.9    -      -       +      -
     26A  LYS*     3.5    42.8    -      -       +      +
     29A  VAL*     4.2    23.8    -      -       +      -
     21B  GLU*     2.6    27.6    +      -       +      +
     22B  VAL*     3.6     4.0    -      -       -      +
     24B  ARG*     1.3    71.5    -      -       -      +
     26B  LYS*     1.3    60.4    +      -       -      +
     27B  LYS      3.1     0.2    -      -       -      -
     28B  LEU*     2.9    13.6    +      -       +      +
     29B  VAL*     2.8    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 26 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  GLU*     2.7    38.1    +      -       -      -
     25A  LEU*     3.6    11.6    -      -       +      +
     22B  VAL*     2.7    41.1    +      -       -      +
     23B  ALA*     3.1    18.6    -      -       +      +
     25B  LEU*     1.3    69.8    -      -       -      +
     27B  LYS*     1.3    63.8    +      -       -      +
     29B  VAL*     3.2    15.7    +      -       +      +
     30B  GLY*     3.1    16.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 27 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  ALA      3.1    14.8    +      -       -      +
     24B  ARG*     3.3    16.4    -      -       +      +
     25B  LEU      3.1     0.2    -      -       -      -
     26B  LYS*     1.3    79.2    -      -       -      +
     28B  LEU*     1.3    60.9    +      -       +      +
     30B  GLY*     2.9    17.5    +      -       -      -
     31B  GLU*     2.7    47.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 28 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  VAL*     5.0     7.9    -      -       +      -
     24B  ARG*     3.1    24.7    +      -       +      +
     25B  LEU*     2.9    21.2    +      -       +      +
     27B  LYS*     1.3    78.6    -      -       +      +
     29B  VAL*     1.3    60.1    +      -       -      +
     31B  GLU*     3.0    25.4    +      -       +      +
     32B  ARG*     2.9    46.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 29 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  LEU*     3.5    23.3    -      -       +      -
     28A  LEU*     5.1     4.3    -      -       +      -
     29A  VAL*     3.3    27.4    -      -       +      -
     32A  ARG*     3.6    25.0    +      -       -      +
     25B  LEU      2.8    20.9    +      -       -      +
     26B  LYS*     3.3    18.4    -      -       +      +
     27B  LYS      3.1     0.2    -      -       -      -
     28B  LEU*     1.3    76.5    -      -       -      +
     30B  GLY*     1.3    59.3    -      -       -      +
     32B  ARG*     3.3    22.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 30 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26B  LYS      3.1     9.1    +      -       -      -
     27B  LYS*     2.9    10.2    +      -       -      -
     29B  VAL*     1.3    76.1    -      -       -      +
     31B  GLU*     1.3    65.2    +      -       -      +
     32B  ARG      3.7     0.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 31 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  LYS*     2.7    54.6    +      -       -      +
     28B  LEU*     3.2    32.9    +      -       +      +
     30B  GLY*     1.3    83.0    -      -       -      +
     32B  ARG*     1.3    57.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 32 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  VAL*     4.1    23.2    +      -       +      +
     32A  ARG*     2.6    78.1    +      -       +      +
     28B  LEU*     2.9    30.4    +      -       -      +
     29B  VAL*     3.3    13.2    -      -       -      +
     30B  GLY      3.4     0.9    -      -       -      +
     31B  GLU*     1.3    81.9    -      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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