Contacts of the helix formed by residues 100 - 124 (chain B) in PDB entry 3V3Q


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 SER 100 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98B  GLU      4.2     0.2    +      -       -      -
     99B  LEU*     1.3    73.5    -      -       -      +
    101B  PRO*     1.3    68.6    -      -       -      +
    102B  ALA      3.6     0.6    +      -       -      -
    103B  ASP*     2.9    28.0    +      -       -      +
    104B  GLN*     2.9    25.5    +      -       -      +
    188B  GLN*     2.6    34.4    +      -       -      -
    189B  GLU*     3.8    19.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  LEU      4.0     2.9    -      -       -      +
    100B  SER*     1.3    86.7    -      -       -      +
    102B  ALA*     1.3    57.8    +      -       -      +
    104B  GLN*     3.4    15.7    +      -       +      +
    105B  ASP*     3.0    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 102 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100B  SER*     3.2     1.8    +      -       -      -
    101B  PRO*     1.3    78.2    -      -       -      +
    103B  ASP*     1.3    59.9    +      -       -      +
    105B  ASP*     3.5     5.9    +      -       -      +
    106B  LEU*     3.0    30.3    +      -       -      +
    188B  GLN*     3.6    29.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 103 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  LEU*     4.3     8.9    -      -       +      +
    100B  SER*     2.9    30.3    +      -       -      +
    102B  ALA*     1.3    76.3    -      -       -      +
    104B  GLN*     1.3    59.4    +      -       -      +
    106B  LEU*     3.5     2.6    +      -       -      +
    107B  LEU*     3.0    38.7    +      -       -      +
    186B  GLY      4.2     2.1    -      -       -      +
    187B  LEU*     3.6    22.9    -      -       +      +
    188B  GLN*     2.8    28.8    +      -       -      +
    189B  GLU*     2.9    34.8    +      -       -      +
    193B  VAL*     4.4     6.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  GLU*     3.0    25.5    -      -       -      +
     96B  PHE*     3.4    47.0    +      -       +      +
     97B  ALA*     3.4    17.3    +      -       -      +
     99B  LEU*     2.7    26.9    +      -       +      +
    100B  SER      2.9    14.0    +      -       -      +
    101B  PRO*     3.6    14.8    -      -       +      +
    102B  ALA      3.3     0.2    -      -       -      -
    103B  ASP*     1.3    75.3    -      -       -      +
    105B  ASP*     1.3    68.3    +      -       -      +
    107B  LEU*     4.8     0.4    -      -       -      -
    108B  LEU*     3.1    26.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87B  ARG*     5.6     6.9    +      -       -      -
    101B  PRO*     3.0    21.9    +      -       -      +
    102B  ALA*     4.0     6.1    -      -       -      +
    104B  GLN*     1.3    82.8    -      -       -      +
    106B  LEU*     1.4    56.5    +      -       -      +
    108B  LEU*     3.8    10.4    -      -       -      +
    109B  GLU*     3.0    47.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 106 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102B  ALA      3.0    18.9    +      -       -      +
    103B  ASP*     3.9     4.7    -      -       -      +
    105B  ASP*     1.4    72.4    -      -       -      +
    107B  LEU*     1.3    60.6    +      -       -      +
    109B  GLU*     4.7     9.9    -      -       +      +
    110B  SER*     2.7    52.6    +      -       -      +
    184B  ARG*     3.9    14.8    -      -       +      -
    185B  HIS      3.2    27.8    -      -       -      +
    186B  GLY*     3.7    22.2    -      -       -      +
    187B  LEU*     3.9    11.0    -      -       +      +
    263B  ASP      6.1     1.8    -      -       -      +
    264B  THR*     6.5     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  PHE*     4.0    10.1    -      -       +      -
     99B  LEU*     3.6    30.3    -      -       +      -
    103B  ASP      3.0    26.3    +      -       -      +
    104B  GLN      4.0     2.7    -      -       -      +
    106B  LEU*     1.3    75.6    -      -       -      +
    108B  LEU*     1.3    58.8    +      -       -      +
    110B  SER*     3.9     4.0    -      -       -      -
    111B  ALA*     3.0    34.5    +      -       -      +
    180B  LEU*     3.5    29.6    -      -       +      +
    181B  ILE*     4.4     3.6    -      -       +      -
    182B  THR      3.3    28.9    -      -       -      +
    184B  ARG*     3.9    13.3    +      -       +      -
    187B  LEU*     4.1    11.7    -      -       +      -
    193B  VAL*     4.0    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 108 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86B  ILE*     3.8    25.1    -      -       +      +
     87B  ARG*     4.1    33.7    -      -       +      +
     90B  ALA*     3.8    18.2    -      -       +      -
     96B  PHE*     4.0    16.6    -      -       +      -
    104B  GLN*     3.1    20.2    +      -       +      +
    105B  ASP*     3.8    11.4    -      -       -      +
    107B  LEU*     1.3    79.1    -      -       -      +
    109B  GLU*     1.3    58.8    +      -       +      +
    111B  ALA*     3.3     1.7    +      -       -      +
    112B  PHE*     2.9    33.1    +      -       -      +
    115B  LEU*     5.2     0.3    -      -       -      +
    180B  LEU*     3.7    20.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 109 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  ASP*     3.0    32.3    +      -       -      +
    106B  LEU*     4.0    10.2    -      -       +      +
    108B  LEU*     1.3    79.2    -      -       +      +
    110B  SER*     1.3    61.2    +      -       -      +
    112B  PHE*     3.5     7.6    +      -       -      +
    113B  LEU      5.0     0.3    +      -       -      -
    256B  ILE*     6.5     0.7    -      -       +      -
    259B  LYS*     3.6    21.0    +      -       -      -
    260B  ILE*     3.3    46.4    -      -       +      +
    263B  ASP*     3.3    27.2    -      -       -      +
    264B  THR*     4.0     8.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106B  LEU*     2.7    37.0    +      -       -      +
    107B  LEU      4.0     0.7    -      -       -      -
    109B  GLU*     1.3    76.3    -      -       -      +
    111B  ALA*     1.3    57.6    +      -       -      +
    112B  PHE      3.4     0.2    -      -       -      -
    113B  LEU      5.2     1.1    +      -       -      -
    114B  GLU*     3.2     8.3    +      -       -      +
    184B  ARG*     3.2    46.9    +      -       -      +
    264B  THR*     4.2    18.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  LEU      3.0    19.0    +      -       -      +
    108B  LEU      4.0     1.6    -      -       -      +
    110B  SER*     1.3    76.1    -      -       -      +
    112B  PHE*     1.3    67.2    +      -       -      +
    113B  LEU      3.4     1.8    -      -       -      -
    114B  GLU*     3.2     8.9    +      -       -      +
    115B  LEU*     2.8    42.1    +      -       +      +
    179B  VAL*     3.9     4.0    -      -       +      +
    180B  LEU*     3.9    19.7    -      -       +      +
    184B  ARG*     3.6    13.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 112 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  LEU*     3.3    35.4    -      -       +      -
     82B  SER*     4.1     3.6    -      -       -      -
     83B  LEU*     4.0    23.1    -      -       +      -
     86B  ILE*     3.8    29.2    -      -       +      -
    108B  LEU      2.9    16.2    +      -       -      +
    109B  GLU      3.5     9.4    +      -       -      +
    110B  SER      3.4     2.2    -      -       -      -
    111B  ALA*     1.3    78.1    -      -       -      +
    113B  LEU*     1.3    87.7    +      -       +      +
    115B  LEU*     3.7     5.5    -      -       -      +
    116B  PHE*     2.8    32.8    +      -       +      +
    257B  ILE*     3.9    21.1    -      -       +      -
    260B  ILE*     3.9    26.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 113 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  LEU*     4.6    10.8    -      -       +      -
    109B  GLU      5.0     0.6    +      -       -      -
    110B  SER      5.2     1.0    +      -       -      +
    111B  ALA      3.4     0.4    -      -       -      -
    112B  PHE*     1.3   102.3    -      -       +      +
    114B  GLU*     1.3    63.2    +      -       -      +
    116B  PHE*     3.2     4.4    +      -       +      +
    117B  ILE*     2.9    29.9    +      -       -      +
    151B  TRP*     4.5    22.0    -      -       +      -
    235B  CYS*     3.9    28.3    -      -       +      +
    238B  GLY      4.3     2.2    -      -       -      -
    239B  LEU*     3.7    42.8    -      -       +      +
    242B  ILE*     4.4    16.8    -      -       +      -
    257B  ILE*     6.0     1.1    -      -       +      -
    260B  ILE*     5.6     8.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 114 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  SER      3.2    12.5    +      -       -      +
    111B  ALA*     3.2     3.8    +      -       -      +
    113B  LEU*     1.3    79.5    -      -       -      +
    115B  LEU*     1.3    56.4    +      -       -      +
    117B  ILE*     3.4     5.9    +      -       -      +
    118B  LEU*     2.8    32.3    +      -       -      +
    179B  VAL*     3.5    26.8    -      -       +      +
    184B  ARG*     3.0    26.5    +      -       -      -
    228B  LEU*     5.1     0.5    -      -       -      +
    231B  LEU*     3.9    23.4    -      -       +      +
    232B  ARG*     3.2    41.4    +      -       -      +
    235B  CYS*     3.9    22.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86B  ILE*     3.4    38.6    -      -       +      -
     89B  TRP*     3.9    15.0    -      -       +      -
    108B  LEU*     5.0     1.1    -      -       +      +
    111B  ALA*     2.8    42.6    +      -       +      +
    112B  PHE*     3.8     1.1    -      -       -      +
    114B  GLU*     1.3    71.8    -      -       -      +
    116B  PHE*     1.3    65.3    +      -       -      +
    118B  LEU*     4.5     3.6    -      -       +      +
    119B  ARG*     2.9    37.6    +      -       -      +
    176B  SER*     3.4    33.9    -      -       -      +
    179B  VAL*     4.0    13.2    -      -       +      -
    180B  LEU*     3.9    15.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78B  LEU      3.9    20.6    -      -       -      -
     79B  LEU*     3.6    31.4    -      -       +      -
     82B  SER*     3.7    25.1    -      -       -      -
     86B  ILE*     3.9     6.6    -      -       -      +
    112B  PHE*     2.8    29.1    +      +       +      +
    113B  LEU*     3.4     6.5    -      -       +      +
    115B  LEU*     1.3    76.4    -      -       -      +
    117B  ILE*     1.3    68.1    +      -       +      +
    119B  ARG*     4.2     2.0    -      -       -      +
    120B  LEU*     3.0    60.1    +      -       +      +
    133B  PHE*     4.4    15.0    -      +       -      -
    148B  PHE*     4.2    20.0    -      +       -      -
    151B  TRP*     4.5     9.9    -      +       -      -
    155B  ILE*     5.2     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113B  LEU      2.9    28.3    +      -       -      +
    114B  GLU*     3.8     6.1    -      -       -      +
    116B  PHE*     1.3    77.1    -      -       +      +
    118B  LEU*     1.3    67.9    +      -       -      +
    120B  LEU*     3.8     4.3    -      -       -      +
    121B  ALA*     2.9    27.7    +      -       -      +
    151B  TRP*     3.4    38.6    -      -       +      -
    155B  ILE*     3.9    22.6    -      -       +      +
    158B  PHE*     4.6     3.8    -      -       +      -
    231B  LEU*     3.8    15.7    -      -       +      +
    234B  LEU*     3.9    22.4    -      -       +      -
    235B  CYS*     3.8    24.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  GLU      2.8    22.7    +      -       -      +
    115B  LEU*     3.9     4.7    -      -       +      +
    117B  ILE*     1.3    73.9    -      -       -      +
    119B  ARG*     1.3    62.1    +      -       +      +
    121B  ALA*     3.6     3.9    -      -       -      +
    122B  TYR*     3.1    22.9    +      -       -      +
    158B  PHE*     3.9    26.0    -      -       +      -
    162B  LEU*     4.1     7.4    -      -       +      -
    172B  PHE*     3.5    26.2    -      -       +      -
    175B  LEU*     4.5    16.4    -      -       +      -
    176B  SER*     3.8    32.5    -      -       -      +
    179B  VAL*     3.9    18.8    -      -       +      -
    227B  LYS*     5.7     1.1    -      -       +      -
    228B  LEU*     5.5     0.7    -      -       +      -
    231B  LEU*     3.9    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  HIS*     4.5    12.5    +      -       +      +
     44B  SER*     2.7    48.8    +      -       -      -
     85B  VAL*     3.5    12.7    -      -       -      +
     86B  ILE*     3.9    12.2    -      -       -      +
     89B  TRP*     4.3    18.9    -      -       -      +
    115B  LEU*     2.9    39.4    +      -       -      +
    116B  PHE      4.4     0.4    -      -       -      +
    118B  LEU*     1.3    74.8    -      -       +      +
    120B  LEU*     1.3    66.2    +      -       -      +
    122B  TYR*     3.5     1.7    +      -       -      +
    123B  ARG*     3.0    47.0    +      -       -      +
    172B  PHE*     4.1    23.6    -      -       +      -
    176B  SER*     4.9     8.0    +      -       -      -
    301B  GOL      5.4     1.7    +      -       -      -
    302B   NA      3.1    26.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  PHE*     3.0    41.2    +      -       +      +
    117B  ILE*     3.8     3.8    -      -       -      +
    118B  LEU      3.3     0.2    -      -       -      -
    119B  ARG*     1.3    77.8    -      -       -      +
    121B  ALA*     1.3    52.3    +      -       -      +
    123B  ARG*     3.2    11.4    +      -       -      +
    124B  SER*     2.6    50.6    +      -       -      +
    131B  LEU*     4.3    15.7    -      -       +      -
    132B  ILE      3.3    26.9    -      -       -      +
    133B  PHE*     3.6    37.5    -      -       +      -
    148B  PHE*     5.1     0.7    -      -       +      -
    152B  ILE*     5.1     3.6    -      -       +      -
    155B  ILE*     4.4    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117B  ILE      2.9    19.4    +      -       -      +
    118B  LEU      3.6     4.0    -      -       -      +
    119B  ARG      3.2     0.2    -      -       -      -
    120B  LEU*     1.3    78.5    -      -       -      +
    122B  TYR*     1.3    61.8    +      -       -      +
    124B  SER*     3.6     4.1    +      -       -      -
    155B  ILE*     4.4     8.9    -      -       +      +
    158B  PHE*     3.7    24.9    -      -       +      -
    159B  SER*     2.8    45.0    +      -       -      +
    162B  LEU*     4.3     5.1    -      -       +      +
    163B  HIS*     3.4     8.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  HIS*     4.2    15.9    -      +       -      -
    118B  LEU      3.1     8.8    +      -       -      +
    119B  ARG      3.9     2.5    -      -       -      +
    121B  ALA*     1.3    79.3    -      -       -      +
    123B  ARG*     1.3    60.7    +      -       -      +
    124B  SER      3.9     0.2    -      -       -      +
    162B  LEU*     3.8    18.3    -      -       +      +
    163B  HIS*     3.5    27.5    -      +       -      -
    167B  VAL*     2.5    38.2    +      -       +      -
    168B  ASP*     3.4    14.9    -      -       -      -
    169B  VAL*     3.6     9.6    +      -       +      +
    172B  PHE*     3.5    62.4    -      +       +      -
    301B  GOL      4.4    11.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44B  SER      5.0     0.4    +      -       -      -
     46B  PRO*     3.8    11.4    -      -       +      +
    119B  ARG*     3.0    43.4    +      -       -      +
    120B  LEU*     3.6    17.2    -      -       -      +
    122B  TYR*     1.3    79.0    -      -       -      +
    124B  SER*     1.3    62.7    +      -       -      +
    125B  LYS*     4.2     6.6    -      -       -      -
    132B  ILE*     3.0    55.4    +      -       +      +
    133B  PHE*     3.3    14.2    -      -       -      +
    134B  CYS*     3.2    27.7    -      -       -      +
    301B  GOL      3.2    31.3    +      -       -      +
    302B   NA      3.2    24.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120B  LEU*     2.6    31.8    +      -       -      +
    121B  ALA*     3.6     5.8    +      -       -      -
    122B  TYR      3.4     1.2    -      -       -      -
    123B  ARG*     1.3    77.7    -      -       -      +
    125B  LYS*     1.3    70.6    +      -       -      +
    126B  PRO*     3.5     3.6    -      -       -      -
    130B  LYS      3.1    14.1    -      -       -      -
    131B  LEU*     3.5    14.3    -      -       -      +
    132B  ILE*     3.3    20.6    +      -       -      +
    156B  LEU*     5.3     2.9    -      -       -      -
    159B  SER*     4.5     6.1    -      -       -      -
    163B  HIS*     3.0    23.6    +      -       -      -
----------------------------------------------------------
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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