Contacts of the helix formed by residues 2 - 25 (chain D) in PDB entry 6C4Z


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 LYS 2 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  SER*     1.3    76.8    +      -       -      +
      3D  LEU*     1.3    68.0    +      -       -      +
      5D  GLU*     3.3    17.2    -      -       -      +
      6D  LEU*     3.2    16.5    +      -       -      +
     16F  LYS*     5.5     2.6    -      -       -      +
     20F  LEU*     3.9    24.3    -      -       +      +
     23F  LYS*     5.0    15.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 3 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  LEU*     3.7    35.0    -      -       +      +
      4C  LEU*     4.1    25.4    -      -       +      -
      7C  LEU*     4.5    15.0    -      -       +      -
      1D  SER      4.0     6.2    -      -       -      +
      2D  LYS*     1.3    75.3    -      -       -      +
      4D  LEU*     1.3    59.1    +      -       +      +
      6D  LEU*     2.7    38.6    +      -       +      +
      7D  LEU*     2.9    23.4    +      -       +      -
     20F  LEU*     4.1    27.7    -      -       +      +
     24F  TRP*     4.5    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 4 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  TRP*     4.3    13.0    -      -       +      -
     18B  ILE*     4.7     4.6    -      -       +      +
     21B  LEU*     4.3    20.2    -      -       +      +
     22B  GLU*     3.9    29.0    -      -       +      +
     25B  GLY*     4.2    28.3    -      -       -      +
     26B  NH2      4.7     0.2    -      -       -      +
      3C  LEU*     3.5    28.9    -      -       +      -
      1D  SER*     3.7    26.1    +      -       -      +
      2D  LYS      3.5     0.2    -      -       -      -
      3D  LEU*     1.3    77.7    -      -       -      +
      5D  GLU*     1.3    61.3    +      -       -      +
      7D  LEU*     3.3    15.8    +      -       +      +
      8D  ARG*     3.0    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 5 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22B  GLU*     4.6     7.1    -      -       -      +
      1D  SER      3.4    12.9    +      -       -      +
      2D  LYS*     3.3    18.7    -      -       -      +
      3D  LEU      3.1     0.6    -      -       -      -
      4D  LEU*     1.3    75.5    -      -       -      +
      6D  LEU*     1.3    64.1    +      -       -      +
      8D  ARG*     2.8    44.8    +      -       -      +
      9D  LYS*     3.0    16.4    +      -       -      +
     16F  LYS*     3.1    40.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 6 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7C  LEU*     4.0    21.5    -      -       +      -
      2D  LYS      3.2     7.8    +      -       -      +
      3D  LEU*     2.7    17.2    +      -       +      +
      5D  GLU*     1.3    74.6    -      -       -      +
      7D  LEU*     1.3    62.6    +      -       -      +
      9D  LYS*     3.3     5.0    +      -       -      +
     10D  LEU*     3.0    33.9    +      -       +      +
     14E  LEU*     5.0     2.0    -      -       +      -
     18E  ILE*     5.5     1.3    -      -       +      -
     21E  LEU*     3.5    31.6    -      -       +      -
     13F  ALA*     3.3    31.6    -      -       -      +
     16F  LYS*     4.3    12.4    -      -       +      +
     17F  ALA*     3.9    17.3    -      -       +      +
     20F  LEU*     4.2    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 7 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  ILE*     3.8    16.2    -      -       +      +
     21B  LEU*     5.7     1.6    -      -       +      -
      3C  LEU*     3.8    34.5    -      -       +      +
      6C  LEU*     4.0    19.1    -      -       +      -
      7C  LEU*     3.7    36.1    -      -       +      +
     10C  LEU*     3.6    27.8    -      -       +      +
      3D  LEU*     2.9    16.7    +      -       +      +
      4D  LEU*     3.4    21.3    -      -       +      +
      6D  LEU*     1.3    74.3    -      -       -      +
      8D  ARG*     1.3    63.1    +      -       -      +
     10D  LEU*     3.1     7.1    +      -       -      +
     11D  GLY*     2.9    20.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 8 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  HIS*     4.8     2.9    +      -       +      +
     18B  ILE*     3.6    16.1    -      -       +      +
     19B  GLU*     4.2    29.6    -      -       +      +
     22B  GLU*     2.8    46.6    +      -       +      +
      4D  LEU      3.0    11.5    +      -       -      +
      5D  GLU*     2.8    40.3    +      -       -      +
      7D  LEU*     1.3    71.3    -      -       -      +
      9D  LYS*     1.3    82.1    +      -       -      +
     11D  GLY*     3.1     2.8    +      -       -      -
     12D  GLU*     2.8    52.6    +      -       +      +
     16F  LYS*     5.9     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 9 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5D  GLU      3.0    15.0    +      -       -      +
      6D  LEU*     3.6     8.1    -      -       -      +
      8D  ARG*     1.3    96.5    -      -       -      +
     10D  LEU*     1.3    56.4    +      -       -      +
     12D  GLU*     3.4    22.2    +      -       -      +
     13D  ALA*     2.9    29.6    +      -       -      +
      9F  LYS*     4.6     7.8    -      -       +      +
     12F  GLU*     2.9    44.6    +      -       +      +
     13F  ALA*     3.9    21.7    -      -       +      +
     16F  LYS*     4.4    31.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 10 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7C  LEU*     3.3    34.5    -      -       +      +
     10C  LEU*     4.4    21.4    -      -       +      +
     11C  GLY*     5.1     2.7    -      -       -      +
     14C  LEU*     3.6    28.9    -      -       +      +
      6D  LEU*     3.0    28.5    +      -       +      +
      7D  LEU*     3.5     7.0    -      -       -      +
      9D  LYS*     1.3    74.8    -      -       -      +
     11D  GLY*     1.3    53.6    +      -       -      +
     13D  ALA*     3.7     3.0    -      -       -      +
     14D  LEU*     2.8    36.7    +      -       -      +
     14E  LEU*     3.6    25.1    -      -       +      -
     18E  ILE*     4.1    15.7    -      -       +      -
     13F  ALA*     4.3     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 11 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11B  GLY      5.2     0.3    -      -       -      +
     14B  LEU*     5.9     1.6    -      -       -      -
     15B  HIS*     4.2    12.7    +      -       -      +
     18B  ILE*     4.2    19.2    -      -       -      +
     10C  LEU*     4.7     5.3    -      -       -      +
      7D  LEU      2.9    12.8    +      -       -      -
      8D  ARG      3.1     4.0    +      -       -      -
     10D  LEU*     1.3    75.5    -      -       -      +
     12D  GLU*     1.3    52.2    +      -       -      +
     14D  LEU*     3.7     5.4    -      -       -      +
     15D  HIS*     2.8    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 12 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  HIS*     3.4    28.5    +      -       +      -
     19B  GLU*     5.6     1.0    -      -       -      -
      8D  ARG*     2.8    40.1    +      -       +      +
      9D  LYS*     3.6    30.7    +      -       -      +
     11D  GLY*     1.3    69.8    -      -       -      +
     13D  ALA*     1.3    59.2    +      -       -      +
     15D  HIS*     3.6     5.1    -      -       -      +
     16D  LYS*     2.9    37.8    +      -       +      +
      9F  LYS*     3.4    32.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 13 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  LEU*     4.4     4.3    -      -       +      -
      9D  LYS      2.9    17.2    +      -       -      +
     10D  LEU*     3.7     7.0    -      -       -      +
     12D  GLU*     1.3    72.9    -      -       -      +
     14D  LEU*     1.3    55.7    +      -       -      +
     16D  LYS*     3.2     5.0    +      -       -      +
     17D  ALA*     2.8    34.9    +      -       -      +
      6F  LEU*     3.6     6.0    -      -       +      +
      9F  LYS*     4.0    25.9    -      -       +      +
     10F  LEU*     4.0    27.8    -      -       +      -
     13F  ALA*     5.3     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 14 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  LEU*     4.8     1.1    -      -       +      -
     10A  LEU*     3.7    22.7    -      -       +      -
     11B  GLY*     5.7     1.6    -      -       -      -
     14B  LEU*     4.1     4.9    -      -       +      -
     10C  LEU*     4.0    28.5    -      -       +      +
     13C  ALA*     3.9    18.6    -      -       +      +
     14C  LEU*     4.0    23.6    -      -       +      +
     17C  ALA*     4.4    16.6    -      -       +      -
     10D  LEU      2.8    21.7    +      -       -      +
     11D  GLY*     3.7     3.6    -      -       -      +
     13D  ALA*     1.3    70.3    -      -       -      +
     15D  HIS*     1.3    65.6    +      -       -      +
     17D  ALA*     2.8    15.1    +      -       -      +
     18D  ILE*     3.0    37.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 15 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8B  ARG*     5.0     3.1    -      -       +      -
     11B  GLY*     4.2    17.7    -      -       -      +
     12B  GLU*     3.5    35.9    +      -       +      +
     15B  HIS*     4.1    26.8    +      +       +      -
     11D  GLY      2.8    23.3    +      -       -      +
     12D  GLU*     3.6     6.3    +      -       -      +
     14D  LEU*     1.3    74.8    -      -       -      +
     16D  LYS*     1.3    78.5    +      -       -      +
     18D  ILE*     3.4     8.4    +      -       +      +
     19D  GLU*     2.9    45.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 16 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12D  GLU*     2.9    23.7    +      -       -      +
     13D  ALA*     3.4     5.8    -      -       -      +
     15D  HIS*     1.3    91.2    +      -       -      +
     17D  ALA*     1.3    66.1    +      -       -      +
     19D  GLU*     3.0    35.8    +      -       +      +
     20D  LEU*     3.2    12.5    +      -       -      +
      2F  LYS      5.8     1.3    -      -       -      +
      5F  GLU*     3.4    42.0    -      -       +      +
      6F  LEU*     4.6    17.0    -      -       +      -
      9F  LYS*     4.7    20.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 17 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  LEU*     4.4     6.1    -      -       +      -
     17C  ALA*     4.2    17.5    -      -       +      -
     18C  ILE*     5.6     1.1    -      -       +      +
     21C  LEU*     4.1    17.3    -      -       +      +
     13D  ALA      2.8    15.6    +      -       -      +
     14D  LEU*     2.8    16.0    +      -       -      +
     16D  LYS*     1.3    72.1    -      -       -      +
     18D  ILE*     1.3    61.0    +      -       -      +
     20D  LEU*     3.2     5.1    +      -       -      +
     21D  LEU*     3.1    21.5    +      -       -      +
      6F  LEU*     4.0    23.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 18 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  LEU*     4.6    15.5    -      -       +      -
     10A  LEU*     3.7    31.0    -      -       +      -
      4B  LEU*     4.9     2.9    -      -       +      +
      7B  LEU*     4.0    10.3    -      -       +      +
      8B  ARG*     3.6    35.7    -      -       +      +
     11B  GLY*     4.4    13.5    -      -       -      -
     17C  ALA*     5.0     3.1    -      -       +      -
     14D  LEU*     3.0    40.3    +      -       +      +
     15D  HIS*     3.7     7.0    -      -       +      +
     17D  ALA*     1.3    71.2    -      -       -      +
     19D  GLU*     1.3    66.1    +      -       -      +
     21D  LEU*     3.3    11.7    +      -       +      +
     22D  GLU*     3.0    21.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 19 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8B  ARG*     4.6    18.6    -      -       +      +
     12B  GLU*     4.6     6.2    -      -       -      +
     15D  HIS*     2.9    47.9    +      -       +      +
     16D  LYS*     3.0    27.4    +      -       +      +
     18D  ILE*     1.3    75.3    -      -       +      +
     20D  LEU*     1.3    65.2    +      -       -      +
     22D  GLU*     3.4    10.3    -      -       -      +
     23D  LYS*     3.2    16.8    +      -       -      +
      2F  LYS*     6.3     2.9    -      -       +      -
      5F  GLU*     5.6     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 20 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  LEU*     3.9    18.2    -      -       +      -
     16D  LYS      3.2     7.3    +      -       -      +
     17D  ALA*     3.2     9.8    +      -       -      +
     19D  GLU*     1.3    73.9    -      -       -      +
     21D  LEU*     1.3    58.0    +      -       -      +
     22D  GLU      3.0     1.1    -      -       -      -
     23D  LYS*     2.5    32.2    +      -       +      +
     24D  TRP*     2.9    49.3    +      -       +      +
      2F  LYS*     3.4    43.5    -      -       +      +
      3F  LEU*     4.1    27.8    -      -       +      +
      6F  LEU*     4.3    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 21 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  LEU*     4.9     2.9    -      -       +      -
      6A  LEU*     4.0    18.4    -      -       +      -
      4B  LEU*     4.4    13.6    -      -       +      +
      7B  LEU*     4.9     2.5    -      -       +      -
     17C  ALA*     4.9     6.1    -      -       +      +
     20C  LEU*     3.7    43.5    -      -       +      -
     21C  LEU*     3.7    25.1    -      -       +      +
     24C  TRP*     3.4    38.9    -      -       +      -
     17D  ALA      3.1     9.8    +      -       -      +
     18D  ILE*     3.3    16.1    +      -       +      +
     20D  LEU*     1.3    76.2    -      -       -      +
     22D  GLU*     1.3    56.5    +      -       -      +
     24D  TRP*     4.7     3.1    -      -       -      +
     25D  GLY*     2.8    28.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 22 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  SER      5.7     1.0    -      -       -      +
      4B  LEU*     4.0    36.4    -      -       +      +
      5B  GLU*     4.9     1.6    -      -       -      +
      8B  ARG*     2.6    49.2    +      -       +      +
     18D  ILE      3.0    11.9    +      -       -      +
     19D  GLU*     3.4    11.5    -      -       -      +
     20D  LEU      2.8     4.2    +      -       -      -
     21D  LEU*     1.3    71.2    -      -       -      +
     23D  LYS*     1.3    65.3    +      -       -      +
     25D  GLY      3.0    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 23 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19D  GLU      3.2     9.1    +      -       -      +
     20D  LEU*     2.5    20.1    +      -       +      +
     22D  GLU*     1.3    78.3    -      -       -      +
     24D  TRP*     1.3    69.5    +      -       +      +
     25D  GLY      3.8     3.6    -      -       -      +
      2F  LYS*     3.8    31.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 24 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  LEU*     3.5    28.9    -      -       +      -
     24C  TRP*     4.5    14.1    -      -       +      +
     25C  GLY*     3.4    36.6    -      -       -      -
     20D  LEU*     2.9    47.2    +      -       +      +
     21D  LEU*     4.2     4.0    -      -       +      +
     23D  LYS*     1.3    86.9    -      -       +      +
     25D  GLY*     1.3    65.0    +      -       -      +
      4E  LEU*     4.2    26.2    -      -       +      -
      3F  LEU*     4.4    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 25 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4B  LEU*     4.2     5.9    -      -       -      +
     24C  TRP*     3.4    29.3    -      -       -      -
     21D  LEU      2.8    17.4    +      -       -      -
     22D  GLU      3.0    14.5    +      -       -      +
     23D  LYS      3.8     3.5    -      -       -      +
     24D  TRP*     1.3    77.0    -      -       -      +
     26D  NH2      1.3    47.1    +      -       -      -
----------------------------------------------------------
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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