Contacts of the helix formed by residues 1103 - 1130 (chain B) in PDB entry 6E5N


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 ASP1103 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1101B  SER*     3.2     3.5    +      -       -      -
   1102B  CYS*     1.3    93.6    -      -       -      +
   1104B  ILE*     1.3    65.1    +      -       +      +
   1105B  GLU*     4.3     7.9    -      -       +      +
   1106B  LEU*     3.3    18.4    +      -       +      +
   1107B  LEU*     3.1    27.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE1104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1102B  CYS      4.3     0.4    +      -       -      -
   1103B  ASP*     1.3    72.1    -      -       -      +
   1105B  GLU*     1.3    76.4    +      -       +      +
   1107B  LEU*     3.2    15.9    +      -       +      +
   1108B  ALA*     3.0    24.4    +      -       +      +
   1111B  ARG*     6.0     3.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU1105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1077B  ALA*     5.6     4.3    -      -       +      +
   1080B  GLY      6.5     0.2    -      -       -      -
   1081B  THR*     3.5    29.9    -      -       -      +
   1084B  TYR*     3.7    22.8    +      -       +      -
   1103B  ASP*     3.2     6.7    -      -       +      +
   1104B  ILE*     1.3    93.8    -      -       +      +
   1106B  LEU*     1.3    61.6    +      -       -      +
   1108B  ALA*     3.3     4.5    +      -       -      +
   1109B  ALA*     3.0    18.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1106 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1084B  TYR*     4.8     6.9    -      -       +      -
   1086B  LEU*     5.9     4.9    -      -       +      -
   1089B  TRP*     6.3     1.6    -      -       +      -
   1097B  THR*     3.6    29.4    -      -       +      -
   1101B  SER*     2.9    38.4    -      -       -      +
   1102B  CYS      5.8     0.2    -      -       -      +
   1103B  ASP*     3.3    15.2    +      -       +      +
   1104B  ILE      3.3     0.4    -      -       -      -
   1105B  GLU*     1.3    76.5    -      -       -      +
   1107B  LEU*     1.3    66.1    +      -       -      +
   1109B  ALA*     3.1     9.2    +      -       +      +
   1110B  CYS*     3.0    29.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1098B  ILE*     3.7    27.3    -      -       +      +
   1101B  SER*     3.2    31.2    -      -       -      +
   1102B  CYS      5.4     0.9    -      -       -      -
   1103B  ASP      3.1    20.4    +      -       -      +
   1104B  ILE*     3.2    18.6    +      -       +      +
   1106B  LEU*     1.3    78.1    -      -       -      +
   1108B  ALA*     1.3    62.0    +      -       -      +
   1110B  CYS*     3.3     5.6    +      -       -      +
   1111B  ARG*     3.0    50.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1108 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1071B  ALA*     5.0     1.3    -      -       +      -
   1073B  LEU*     3.9    25.7    -      -       +      +
   1081B  THR*     4.2     9.0    -      -       +      -
   1104B  ILE*     3.0    15.2    +      -       +      +
   1105B  GLU*     3.6    10.5    -      -       -      +
   1107B  LEU*     1.3    76.0    -      -       -      +
   1109B  ALA*     1.3    58.4    +      -       -      +
   1111B  ARG*     3.2    15.4    +      -       -      +
   1112B  GLU*     2.9    35.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1109 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1081B  THR*     3.8     6.5    -      -       +      +
   1084B  TYR*     3.6    25.1    -      -       +      -
   1086B  LEU*     3.1    27.4    -      -       +      +
   1105B  GLU      3.0    13.7    +      -       -      +
   1106B  LEU*     3.1    11.2    +      -       +      +
   1108B  ALA*     1.3    77.6    -      -       -      +
   1110B  CYS*     1.3    62.7    +      -       -      +
   1112B  GLU*     3.3    15.9    +      -       -      +
   1113B  GLU*     3.0    17.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS1110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1086B  LEU*     3.7    15.5    -      -       -      -
   1094B  LEU*     4.2    15.9    -      -       +      -
   1097B  THR*     4.2     8.5    -      -       -      -
   1098B  ILE*     3.3    37.7    -      -       +      -
   1106B  LEU*     3.0    34.2    +      -       -      -
   1107B  LEU      3.7     7.0    -      -       -      +
   1109B  ALA*     1.3    73.2    -      -       -      +
   1111B  ARG*     1.3    61.3    +      -       -      +
   1113B  GLU*     3.2     3.9    +      -       -      +
   1114B  PHE*     2.9    36.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG1111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1065B  PHE*     5.0     3.4    +      -       +      +
   1066B  LEU*     3.4    28.2    -      -       +      +
   1068B  ARG*     6.0     0.4    -      -       -      +
   1069B  GLY*     2.7    43.4    +      -       -      +
   1070B  PRO      3.7    11.5    +      -       -      -
   1071B  ALA*     3.7    23.1    -      -       +      +
   1098B  ILE*     6.0     4.7    -      -       +      +
   1104B  ILE*     6.0     3.6    -      -       -      +
   1107B  LEU*     3.0    38.9    +      -       -      +
   1108B  ALA*     3.2    10.3    +      -       -      +
   1110B  CYS*     1.3    77.4    -      -       +      +
   1112B  GLU*     1.3    62.3    +      -       +      +
   1114B  PHE*     3.3     3.5    +      -       -      -
   1115B  HIS*     3.0    21.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU1112 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1073B  LEU*     2.8    40.5    -      -       +      +
   1078B  ALA*     4.6     2.1    -      -       -      +
   1081B  THR*     3.8     6.5    -      -       -      +
   1082B  LYS*     3.2    48.4    -      -       -      +
   1108B  ALA      2.9    18.6    +      -       -      +
   1109B  ALA*     3.5    15.5    -      -       -      +
   1110B  CYS      3.2     0.2    -      -       -      -
   1111B  ARG*     1.3    77.6    -      -       +      +
   1113B  GLU*     1.3    61.7    +      -       -      +
   1115B  HIS*     3.3     6.2    +      -       -      +
   1116B  ARG*     3.0    32.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU1113 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  GLY*     4.4     1.2    -      -       -      +
   1086B  LEU*     3.9    23.8    +      -       +      +
   1087B  SER*     3.2    35.0    +      -       -      -
   1094B  LEU*     4.0     9.4    -      -       +      -
   1109B  ALA      3.0    14.2    +      -       -      +
   1110B  CYS*     3.2     9.2    +      -       -      +
   1112B  GLU*     1.3    75.5    -      -       -      +
   1114B  PHE*     1.3    59.8    +      -       +      +
   1116B  ARG*     3.4     7.8    +      -       -      +
   1117B  ARG*     2.8    74.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE1114 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1062B  MET*     3.5    43.1    -      -       +      -
   1065B  PHE*     4.2    19.1    -      +       +      -
   1066B  LEU*     4.1    14.4    -      -       +      -
   1091B  TYR*     4.3    19.1    -      +       -      -
   1094B  LEU*     3.4    46.9    -      -       +      -
   1095B  ARG*     4.5     4.9    -      -       +      -
   1098B  ILE*     3.8    22.7    -      -       +      -
   1110B  CYS      2.9    22.6    +      -       -      +
   1111B  ARG*     3.5     5.8    -      -       -      +
   1113B  GLU*     1.3    80.1    -      -       +      +
   1115B  HIS*     1.3    57.2    +      -       -      +
   1117B  ARG*     3.3     6.8    +      -       -      +
   1118B  LEU*     2.8    37.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS1115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1066B  LEU*     4.1    18.5    -      -       +      +
   1111B  ARG      3.0    16.8    +      -       -      +
   1112B  GLU*     3.6     7.0    -      -       -      +
   1113B  GLU      3.3     0.2    -      -       -      -
   1114B  PHE*     1.3    76.7    -      -       -      +
   1116B  ARG*     1.3    63.2    +      -       +      +
   1118B  LEU*     3.3     6.0    +      -       +      +
   1119B  LYS*     2.9    36.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG1116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1082B  LYS*     5.6     6.9    -      -       -      +
   1112B  GLU*     3.0    20.8    +      -       +      +
   1113B  GLU*     3.8    11.9    -      -       -      +
   1115B  HIS*     1.3    80.1    +      -       +      +
   1117B  ARG*     1.3    63.4    +      -       -      +
   1119B  LYS*     3.3    11.7    +      -       -      +
   1120B  VAL*     3.1    29.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG1117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ILE*     3.5    27.9    -      -       -      +
     55A  LEU*     3.9    13.1    +      -       +      +
     56A  ASP*     2.7    37.1    +      -       -      +
     58A  GLY*     3.2    14.9    -      -       -      +
   1062B  MET*     4.6     5.6    -      -       -      -
   1086B  LEU      3.6     0.6    +      -       -      -
   1087B  SER      2.7    28.1    +      -       -      -
   1089B  TRP      2.6    26.9    +      -       -      -
   1091B  TYR*     3.9     7.5    -      -       -      +
   1094B  LEU*     3.7    15.1    -      -       -      +
   1113B  GLU*     2.8    46.8    +      -       -      +
   1114B  PHE*     3.7     8.1    -      -       -      +
   1116B  ARG*     1.3    76.0    -      -       -      +
   1118B  LEU*     1.3    65.3    +      -       -      +
   1120B  VAL*     3.3     4.6    +      -       -      -
   1121B  TYR*     3.0    20.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  LEU*     4.3     1.3    -      -       +      -
   1059B  ALA*     3.4    44.6    -      -       +      +
   1062B  MET*     3.3    29.8    -      -       +      -
   1063B  SER*     3.9     9.4    -      -       -      +
   1066B  LEU*     3.3    24.9    -      -       +      -
   1114B  PHE      2.8    24.4    +      -       -      +
   1115B  HIS*     3.6     8.1    -      -       +      +
   1117B  ARG*     1.3    76.2    -      -       -      +
   1119B  LYS*     1.3    64.7    +      -       -      +
   1121B  TYR*     3.2     5.3    +      -       +      +
   1122B  HIS*     2.9    41.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS1119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1115B  HIS*     2.9    27.3    +      -       +      +
   1116B  ARG*     3.5    14.6    -      -       -      +
   1117B  ARG      3.3     0.2    -      -       -      -
   1118B  LEU*     1.3    77.0    -      -       -      +
   1120B  VAL*     1.3    65.8    +      -       +      +
   1122B  HIS*     3.3    11.9    +      -       +      +
   1123B  ALA*     3.0    25.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL1120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ILE*     3.4    16.2    -      -       +      -
     58A  GLY      6.0     0.9    -      -       -      +
     59A  ALA      3.6     5.6    -      -       -      +
     60A  PRO*     3.1    38.8    -      -       +      +
   1116B  ARG*     3.1    16.7    +      -       +      +
   1117B  ARG*     3.7     9.0    -      -       -      +
   1119B  LYS*     1.3    77.5    -      -       +      +
   1121B  TYR*     1.3    56.1    +      -       -      +
   1123B  ALA*     3.2     8.0    +      -       +      +
   1124B  TRP*     2.8    28.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR1121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  ALA*     3.8    20.0    -      -       +      -
     54A  ILE*     3.3    10.4    -      -       +      +
     55A  LEU*     3.2    30.7    -      -       +      -
   1055B  PRO*     3.4    30.8    -      -       +      +
   1056B  GLU*     3.1    33.4    +      -       +      +
   1059B  ALA*     4.2    18.8    -      -       +      -
   1117B  ARG      3.0    14.1    +      -       -      +
   1118B  LEU*     3.2     9.6    +      -       -      +
   1120B  VAL*     1.3    77.6    -      -       -      +
   1122B  HIS*     1.3    75.5    +      +       -      +
   1124B  TRP*     3.2     5.4    +      +       -      +
   1125B  LYS*     3.0    55.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS1122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1059B  ALA*     5.5     3.8    -      -       +      +
   1118B  LEU*     2.9    41.6    +      -       +      +
   1119B  LYS*     3.6    13.9    -      -       +      +
   1120B  VAL      3.3     0.2    -      -       -      -
   1121B  TYR*     1.3    89.7    -      +       -      +
   1123B  ALA*     1.3    64.2    +      -       -      +
   1125B  LYS*     3.3     7.2    +      -       -      +
   1126B  SER*     2.9    22.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1119B  LYS*     3.0    17.9    +      -       +      +
   1120B  VAL*     3.5    10.8    -      -       +      +
   1122B  HIS*     1.3    76.1    -      -       -      +
   1124B  TRP*     1.3    61.9    +      -       -      +
   1126B  SER*     3.1    10.4    +      -       -      -
   1127B  LYS*     3.1    36.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP1124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  GLU*     2.8    49.6    -      -       +      -
     48A  ASN*     4.4     4.7    -      -       -      -
     50A  GLU*     2.9    25.3    +      -       +      +
     51A  ALA*     3.2    25.8    -      -       +      -
     54A  ILE*     3.3    31.2    -      -       +      -
     60A  PRO      4.8     3.1    -      -       -      +
     61A  GLY*     4.2    10.8    -      -       -      -
   1055B  PRO*     5.7     0.2    -      -       +      -
   1120B  VAL      2.8     9.2    +      -       -      +
   1121B  TYR*     3.2     6.3    +      +       -      +
   1123B  ALA*     1.3    75.7    -      -       -      +
   1125B  LYS*     1.3   101.4    +      -       +      +
   1127B  LYS*     3.1    27.7    +      -       +      +
   1128B  ASN*     2.9    48.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS1125 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1056B  GLU*     3.4    23.7    +      -       -      +
   1121B  TYR*     3.0    51.4    +      -       +      +
   1122B  HIS*     3.6    11.2    -      -       -      +
   1124B  TRP*     1.3    99.8    -      -       +      +
   1126B  SER*     1.3    53.7    +      -       -      +
   1128B  ASN*     3.7     4.8    -      -       +      +
   1129B  LYS*     2.7    71.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER1126 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1122B  HIS      2.9    13.6    +      -       -      -
   1123B  ALA*     3.2    14.4    -      -       -      -
   1125B  LYS*     1.3    77.4    -      -       -      +
   1127B  LYS*     1.3    49.4    +      -       -      +
   1129B  LYS*     4.4     4.5    -      -       -      -
   1130B  LYS*     2.5    42.5    +      -       -      +
   1131B  ARG*     4.1    16.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS1127 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  PRO      5.2     7.7    +      -       -      -
   1123B  ALA*     3.1    25.6    +      -       -      +
   1124B  TRP*     3.1    20.0    +      -       +      +
   1126B  SER*     1.3    77.9    -      -       -      +
   1128B  ASN*     1.3    64.7    +      -       -      +
   1130B  LYS      2.5    20.9    -      -       -      +
   1131B  ARG*     2.8    19.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN1128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  GLU*     3.2    35.0    -      -       -      +
     50A  GLU*     5.5     0.2    -      -       -      +
   1124B  TRP*     2.9    62.8    +      -       +      +
   1125B  LYS*     3.9     8.5    -      -       +      +
   1127B  LYS*     1.3    78.9    -      -       -      +
   1129B  LYS*     1.3    68.9    +      -       +      +
   1130B  LYS*     4.6     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS1129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1056B  GLU*     5.9     0.2    -      -       -      -
   1125B  LYS*     2.7    62.5    +      -       +      +
   1126B  SER*     4.0     4.3    -      -       -      +
   1128B  ASN*     1.3    77.5    -      -       +      +
   1130B  LYS*     1.3    71.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS1130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1126B  SER*     2.5    26.8    +      -       -      +
   1127B  LYS*     2.5    22.5    -      -       -      +
   1128B  ASN      5.0     0.2    -      -       -      -
   1129B  LYS*     1.3    85.3    -      -       +      +
   1131B  ARG*     1.3    89.2    +      -       +      +
----------------------------------------------------------
 Back to top of page


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