Contacts of the helix formed by residues 1074 - 1103 (chain r) in PDB entry 6FF7


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 GLY1074 (chain r).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1033r  GLU*     6.2     4.3    -      -       -      -
   1072r  LEU*     3.6     9.2    -      -       -      +
   1073r  GLU*     1.3    81.0    -      -       -      +
   1075r  PHE*     1.3    64.5    +      -       -      -
   1076r  ALA*     3.5     2.7    -      -       -      -
   1077r  LEU*     3.8    11.4    +      -       -      +
   1078r  MET*     3.4    15.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE1075 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1073r  GLU      3.6     2.4    +      -       -      -
   1074r  GLY*     1.3    70.3    -      -       -      -
   1076r  ALA*     1.3    67.7    +      -       -      +
   1077r  LEU      3.2     0.2    -      -       -      -
   1078r  MET*     2.9    18.0    +      -       -      +
   1079r  ALA*     3.0    15.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1076 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1033r  GLU*     6.0     5.2    -      -       +      -
   1074r  GLY*     5.2     0.9    -      -       -      -
   1075r  PHE*     1.3    78.4    -      -       -      +
   1077r  LEU*     1.3    57.2    +      -       -      +
   1079r  ALA*     3.5     4.8    +      -       -      +
   1080r  ASP*     2.9    30.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1077 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1033r  GLU*     5.3    13.6    -      -       +      +
   1062r  LEU*     5.9     0.2    -      -       -      +
   1072r  LEU*     4.5    13.7    -      -       +      -
   1074r  GLY*     3.8    14.4    +      -       -      +
   1075r  PHE      3.2     0.4    -      -       -      -
   1076r  ALA*     1.3    76.5    -      -       -      +
   1078r  MET*     1.3    61.9    +      -       -      +
   1080r  ASP*     3.5     6.8    -      -       -      +
   1081r  MET*     2.8    31.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET1078 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1072r  LEU*     4.8    13.6    -      -       +      +
   1074r  GLY      3.4    12.6    +      -       -      +
   1075r  PHE*     2.9    12.1    +      -       -      +
   1077r  LEU*     1.3    76.7    -      -       -      +
   1079r  ALA*     1.3    64.7    +      -       -      +
   1081r  MET*     3.0     8.9    +      -       -      +
   1082r  VAL*     2.9    22.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1079 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    834r  TYR*     5.3    15.3    -      -       +      +
    836r  PRO*     3.9    11.4    -      -       +      +
   1075r  PHE      3.0    13.8    +      -       -      +
   1076r  ALA*     3.9     5.2    -      -       -      +
   1078r  MET*     1.3    74.8    -      -       -      +
   1080r  ASP*     1.3    64.4    +      -       -      +
   1082r  VAL*     3.3     9.6    +      -       -      +
   1083r  TYR*     3.0    21.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP1080 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    836r  PRO*     4.0    14.3    -      -       +      +
   1062r  LEU*     5.8     0.2    -      -       -      -
   1076r  ALA      2.9    19.7    +      -       -      +
   1077r  LEU*     3.5     8.7    -      -       -      +
   1078r  MET      3.2     0.2    -      -       -      -
   1079r  ALA*     1.3    75.4    -      -       -      +
   1081r  MET*     1.3    63.4    +      -       -      +
   1083r  TYR*     3.0     7.2    +      -       -      +
   1084r  VAL*     2.9    22.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET1081 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1062r  LEU*     4.4    26.1    -      -       +      +
   1065r  ALA*     6.3     1.1    -      -       +      -
   1066r  PHE*     5.6     5.3    -      -       +      +
   1077r  LEU      2.8    20.7    +      -       -      +
   1078r  MET*     3.4     6.3    -      -       -      +
   1080r  ASP*     1.3    72.1    -      -       -      +
   1082r  VAL*     1.3    63.6    +      -       -      +
   1084r  VAL*     3.1     7.9    +      -       -      +
   1085r  THR*     2.9    27.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL1082 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1078r  MET      2.9    12.7    +      -       -      +
   1079r  ALA*     3.4    13.2    -      -       -      +
   1081r  MET*     1.3    76.4    -      -       -      +
   1083r  TYR*     1.3    63.5    +      -       -      +
   1085r  THR*     3.3     4.0    +      -       -      -
   1086r  GLN*     2.9    27.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR1083 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    836r  PRO*     3.7    30.3    -      -       +      +
    837r  GLU*     5.1     2.2    -      -       -      +
   1079r  ALA      3.0     5.6    +      -       -      +
   1080r  ASP      3.0     9.7    +      -       -      +
   1082r  VAL*     1.3    76.7    -      -       -      +
   1084r  VAL*     1.3    64.3    +      -       -      +
   1086r  GLN*     3.9     3.7    -      -       -      +
   1087r  SER*     3.0    26.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL1084 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1059r  ILE*     5.0    13.9    -      -       +      +
   1062r  LEU*     5.0    11.9    -      -       +      -
   1063r  LEU*     5.4     6.5    -      -       +      +
   1080r  ASP      2.9    12.2    +      -       -      +
   1081r  MET*     3.5    11.0    -      -       -      +
   1083r  TYR*     1.3    77.5    -      -       -      +
   1085r  THR*     1.3    58.3    +      -       -      +
   1087r  SER*     3.5     4.3    +      -       -      -
   1088r  ALA*     2.9    28.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR1085 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1063r  LEU*     5.9     5.4    -      -       -      +
   1066r  PHE*     4.4    21.5    -      -       -      -
   1081r  MET      2.9    16.1    +      -       -      -
   1082r  VAL*     4.0     3.8    -      -       -      -
   1084r  VAL*     1.3    74.4    -      -       -      +
   1086r  GLN*     1.3    66.6    +      -       -      +
   1088r  ALA*     3.2    20.6    +      -       -      +
   1089r  GLY      3.7     3.5    +      -       -      -
   1118r  ILE*     5.7     2.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN1086 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1082r  VAL      2.9    17.9    +      -       -      +
   1083r  TYR*     4.0     3.6    -      -       -      +
   1085r  THR*     1.3    79.1    -      -       -      +
   1087r  SER*     1.3    62.5    +      -       -      +
   1088r  ALA      3.3     0.7    +      -       -      -
   1089r  GLY*     3.6     7.8    +      -       -      -
   1090r  ARG*     4.7     2.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER1087 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1023r  GLU*     5.4    13.0    -      -       -      -
   1083r  TYR      3.0    16.9    +      -       -      -
   1084r  VAL*     4.0     3.8    -      -       -      -
   1086r  GLN*     1.3    77.1    -      -       -      +
   1088r  ALA*     1.3    62.9    +      -       -      +
   1089r  GLY      3.2     1.1    +      -       -      -
   1090r  ARG*     3.4     8.8    +      -       -      +
   1091r  LEU*     3.0    23.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1088 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1063r  LEU*     6.0     6.1    -      -       +      -
   1084r  VAL      2.9    19.8    +      -       -      +
   1085r  THR*     3.3    15.9    -      -       -      +
   1086r  GLN      3.1     0.8    -      -       -      -
   1087r  SER*     1.3    74.4    -      -       -      +
   1089r  GLY*     1.3    59.0    +      -       -      +
   1091r  LEU*     4.2     7.2    -      -       -      -
   1092r  MET*     2.9    34.1    +      -       +      +
   1118r  ILE*     5.4    11.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY1089 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1085r  THR      3.7     3.6    +      -       -      -
   1086r  GLN      3.6     7.8    +      -       -      -
   1087r  SER      3.2     1.4    +      -       -      -
   1088r  ALA*     1.3    77.8    -      -       -      +
   1090r  ARG*     1.3    63.3    +      -       -      +
   1092r  MET*     4.1     1.9    -      -       -      +
   1093r  ARG*     3.0    27.3    +      -       -      +
   1115r  CYS*     5.8     3.3    -      -       -      +
   1118r  ILE*     5.4     8.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG1090 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    991r  TYR*     3.4    32.7    -      -       +      +
    993r  ILE*     5.8     2.2    -      -       +      -
   1086r  GLN      4.7     1.6    +      -       -      +
   1087r  SER*     3.4     8.5    +      -       -      +
   1089r  GLY*     1.3    74.2    -      -       -      +
   1091r  LEU*     1.3    64.4    +      -       -      +
   1093r  ARG*     3.3     6.1    +      -       -      +
   1094r  ALA*     2.9    25.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1091 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    993r  ILE*     5.6     6.3    -      -       -      -
   1018r  PHE*     5.9     5.6    -      -       +      +
   1021r  SER*     5.4    13.2    -      -       -      -
   1087r  SER*     3.0    19.7    +      -       -      +
   1088r  ALA*     3.8     8.1    -      -       -      +
   1090r  ARG*     1.3    76.4    -      -       -      +
   1092r  MET*     1.3    64.5    +      -       -      +
   1094r  ALA*     3.1     7.3    +      -       -      +
   1095r  ILE*     3.0    21.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET1092 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1018r  PHE*     6.4     2.5    -      -       +      -
   1088r  ALA*     2.9    22.0    +      -       +      +
   1089r  GLY*     4.1     2.0    -      -       -      +
   1091r  LEU*     1.3    73.6    -      -       -      +
   1093r  ARG*     1.3    57.8    -      -       -      +
   1095r  ILE*     3.2    10.7    -      -       -      +
   1096r  PHE*     2.9    27.0    +      -       -      +
   1111r  THR*     4.6     8.5    -      -       -      +
   1114r  LEU*     5.3     6.5    -      -       +      -
   1115r  CYS*     4.7    21.8    -      -       -      +
   1118r  ILE*     6.0     2.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG1093 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    991r  TYR*     5.5     2.9    -      -       +      -
   1089r  GLY      3.0    20.1    +      -       -      +
   1090r  ARG*     3.5     6.5    -      -       -      +
   1092r  MET*     1.3    76.9    -      -       -      +
   1094r  ALA*     1.3    60.0    +      -       -      +
   1096r  PHE*     3.2     8.4    +      -       -      +
   1097r  GLU*     2.9    29.3    +      -       -      +
   1115r  CYS*     5.3     8.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1094 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    987r  ILE*     4.5    17.1    -      -       +      +
    988r  ALA*     5.8     0.7    -      -       -      -
    991r  TYR*     4.0    19.2    -      -       +      +
    993r  ILE*     5.1     9.0    -      -       +      -
   1090r  ARG      2.9    16.9    +      -       -      +
   1091r  LEU*     3.1     6.3    +      -       -      +
   1093r  ARG*     1.3    72.3    -      -       -      +
   1095r  ILE*     1.3    66.6    +      -       -      +
   1097r  GLU*     3.5     6.8    +      -       -      +
   1098r  ILE*     3.0    24.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE1095 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1001r  TYR*     6.0     8.3    -      -       +      -
   1091r  LEU      3.0    13.1    +      -       -      +
   1092r  MET*     3.2    13.7    -      -       -      +
   1094r  ALA*     1.3    78.0    -      -       -      +
   1096r  PHE*     1.3    63.3    +      -       -      +
   1098r  ILE*     3.4     5.0    -      -       -      +
   1099r  VAL*     2.9    28.1    +      -       +      +
   1111r  THR*     4.8     7.6    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE1096 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1092r  MET      2.9    15.6    +      -       -      +
   1093r  ARG*     3.5    11.7    -      -       -      +
   1095r  ILE*     1.3    72.3    -      -       -      +
   1097r  GLU*     1.3    64.9    +      -       -      +
   1099r  VAL*     3.2     2.3    +      -       -      +
   1100r  LEU*     2.9    28.3    +      -       -      +
   1108r  THR*     4.9     5.2    -      -       -      +
   1111r  THR*     4.0    30.2    -      -       -      +
   1112r  LEU*     4.4     8.5    -      -       +      +
   1115r  CYS*     5.8     2.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU1097 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    987r  ILE*     4.9    12.3    -      -       +      -
   1093r  ARG      2.9    16.2    +      -       -      +
   1094r  ALA*     3.7     8.1    -      -       -      +
   1096r  PHE*     1.3    75.3    -      -       -      +
   1098r  ILE*     1.3    57.4    +      -       -      +
   1100r  LEU*     3.7     4.9    -      -       -      +
   1101r  ASN*     3.0    30.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE1098 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    984r  LEU*     6.6     0.4    -      -       -      -
    987r  ILE*     5.3     7.3    -      -       +      +
   1001r  TYR*     6.2     4.3    -      -       +      -
   1094r  ALA      3.0    14.6    +      -       -      +
   1095r  ILE*     3.4    10.3    -      -       -      +
   1097r  GLU*     1.3    75.3    -      -       -      +
   1099r  VAL*     1.3    60.7    +      -       +      +
   1101r  ASN*     3.1     9.2    +      -       -      +
   1102r  ARG*     3.0    26.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL1099 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1005r  LEU*     5.9     7.0    -      -       +      -
   1095r  ILE*     2.9    15.7    +      -       +      +
   1096r  PHE*     4.0     4.3    -      -       -      +
   1098r  ILE*     1.3    79.9    -      -       +      +
   1100r  LEU*     1.3    56.2    +      -       -      +
   1102r  ARG*     3.6     8.6    -      -       -      +
   1103r  GLY      3.3     4.0    +      -       -      -
   1104r  TRP*     3.3    31.5    +      -       +      +
   1107r  LEU*     4.9    18.6    -      -       +      +
   1108r  THR*     4.6     8.5    -      -       -      +
   1111r  THR*     5.6     1.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1100 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1096r  PHE      2.9    18.6    +      -       -      +
   1097r  GLU*     3.7     5.4    -      -       -      +
   1099r  VAL*     1.3    76.8    -      -       -      +
   1101r  ASN*     1.3    65.0    +      -       -      +
   1102r  ARG      3.1     1.3    -      -       -      -
   1103r  GLY*     3.0    15.3    +      -       -      +
   1104r  TRP      5.1     0.2    -      -       -      +
   1108r  THR*     4.2    18.3    -      -       -      -
   1233r  ILE*     5.7     0.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN1101 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    983r  GLU*     5.5    11.4    -      -       +      -
   1097r  GLU      3.0    18.9    +      -       -      +
   1098r  ILE*     3.5     7.0    -      -       -      +
   1100r  LEU*     1.3    76.4    -      -       -      +
   1102r  ARG*     1.3    61.4    +      -       -      +
   1103r  GLY*     3.5     0.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG1102 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1098r  ILE      3.0    12.4    +      -       -      +
   1099r  VAL*     3.6    13.2    -      -       -      +
   1100r  LEU      3.1     0.4    -      -       -      -
   1101r  ASN*     1.3    79.7    -      -       -      +
   1103r  GLY*     1.3    58.5    +      -       -      +
   1104r  TRP*     3.6     6.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY1103 (chain r). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1099r  VAL      3.3     1.2    +      -       -      -
   1100r  LEU*     3.0    17.4    +      -       -      -
   1101r  ASN      4.4     0.4    -      -       -      -
   1102r  ARG*     1.3    80.2    -      -       -      +
   1104r  TRP*     1.3    59.3    +      -       -      +
   1105r  ALA      3.3     1.9    +      -       -      -
   1232r  VAL*     3.8     4.0    -      -       -      +
   1233r  ILE*     2.9    45.7    +      -       -      +
----------------------------------------------------------
 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