Contacts of the helix formed by residues 114 - 139 (chain B) in PDB entry 1HPL


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 TYR 114 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  THR      3.6     1.6    +      -       -      -
    113B  ALA*     1.3    70.3    -      -       -      +
    115B  SER*     1.3    57.7    +      -       -      +
    117B  ALA*     3.3     2.6    +      -       -      +
    118B  SER*     2.8    50.3    +      -       -      -
    153B  LEU*     3.3    29.7    -      -       +      +
    178B  ALA*     3.3    12.8    -      -       -      +
    180B  PRO*     2.7    43.1    +      -       +      +
    181B  CYS*     4.0    10.1    -      -       -      -
    215B  PHE*     3.7    23.8    -      +       -      -
    248B  ILE*     4.1    23.3    -      -       +      +
    249B  ASP*     3.0    16.3    +      -       -      +
    252B  TRP*     3.7    43.5    -      +       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25B  LEU*     4.1    29.8    -      -       -      +
     27B  ILE*     4.2     7.3    -      -       -      +
    113B  ALA*     4.1    11.3    -      -       -      +
    114B  TYR*     1.3    78.0    -      -       -      +
    116B  GLN*     1.3    63.3    +      -       -      +
    118B  SER*     3.6     7.9    -      -       -      -
    119B  GLN*     3.3    25.8    +      -       -      +
    181B  CYS*     4.8    10.3    -      -       -      -
    249B  ASP*     4.4     4.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  ILE*     4.4    16.8    -      -       +      +
     28B  LEU      2.9    28.4    +      -       -      +
     29B  PRO*     3.5     3.0    -      -       -      +
     30B  TRP*     3.4    43.6    +      -       +      +
    112B  THR*     4.3     9.6    -      -       +      +
    113B  ALA*     3.0    13.8    +      -       +      +
    115B  SER*     1.3    79.2    +      -       -      +
    117B  ALA*     1.3    59.7    +      -       -      +
    119B  GLN*     3.2     5.1    +      -       -      +
    120B  ASN*     2.9    50.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106B  TRP*     3.9     3.4    -      -       +      -
    109B  GLY      3.8    12.3    -      -       -      +
    110B  SER*     3.8    30.7    -      -       -      +
    112B  THR*     4.1     1.8    +      -       -      +
    113B  ALA      3.0    10.1    +      -       -      +
    114B  TYR      3.8     4.9    -      -       -      +
    116B  GLN*     1.3    73.9    -      -       -      +
    118B  SER*     1.3    57.0    +      -       -      +
    120B  ASN*     3.0    15.6    +      -       -      +
    121B  VAL*     3.2    15.9    +      -       -      +
    153B  LEU*     3.6    20.6    -      -       +      -
    252B  TRP*     3.8     9.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  ARG*     4.5     8.3    +      -       -      -
    114B  TYR*     2.8    51.1    +      -       -      -
    115B  SER*     3.6     9.2    -      -       -      -
    117B  ALA*     1.3    71.0    -      -       -      +
    119B  GLN*     1.3    66.8    +      -       -      +
    121B  VAL*     3.1    23.1    -      -       -      +
    122B  ARG*     4.8     1.4    -      -       -      +
    153B  LEU*     4.1     4.6    -      -       -      +
    181B  CYS*     4.0     9.4    -      -       -      +
    182B  PHE*     3.8    25.1    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17B  TRP      2.8    27.9    +      -       -      +
     18B  ALA*     4.1     6.3    -      -       -      +
     23B  ARG*     3.5    15.2    +      -       -      +
     25B  LEU      4.9     1.8    +      -       -      -
     27B  ILE*     3.6    34.5    +      -       +      +
     29B  PRO*     3.4    22.3    -      -       -      +
    115B  SER      3.3    12.5    +      -       -      +
    116B  GLN*     3.2    13.9    +      -       -      +
    118B  SER*     1.3    81.3    -      -       -      +
    120B  ASN*     1.3    59.8    +      -       -      +
    122B  ARG*     3.2    55.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29B  PRO*     4.4     4.0    -      -       -      -
     30B  TRP*     2.9    56.2    +      -       -      -
     34B  VAL*     3.9    14.4    -      -       +      -
    106B  TRP*     4.3     6.1    -      -       +      -
    109B  GLY*     2.8    29.7    +      -       -      +
    112B  THR*     4.3     0.2    +      -       -      -
    116B  GLN*     2.9    29.6    +      -       -      +
    117B  ALA      3.0     8.4    +      -       -      +
    119B  GLN*     1.3    72.5    -      -       -      +
    121B  VAL*     1.3    64.5    +      -       -      +
    122B  ARG      3.1     0.9    +      -       -      -
    123B  ILE*     3.2    14.2    +      -       -      +
    124B  VAL*     3.3    15.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106B  TRP*     4.0    10.1    -      -       +      -
    117B  ALA      3.2    13.1    +      -       -      +
    118B  SER*     3.1    20.9    -      -       -      +
    120B  ASN*     1.3    76.1    -      -       -      +
    122B  ARG*     1.4    62.0    +      -       +      +
    124B  VAL*     3.4    10.4    +      -       -      +
    125B  GLY*     2.9    27.5    +      -       -      -
    153B  LEU*     3.5    38.6    -      -       +      +
    156B  HIS*     4.5     4.3    -      -       +      +
    157B  ALA*     3.9    24.0    -      -       +      +
    160B  GLU*     4.4     2.7    -      -       +      +
    182B  PHE*     4.2    17.3    -      -       +      -
    189B  VAL      5.7     1.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11B  PHE*     3.9    30.9    -      -       +      +
     12B  SER      2.8    40.2    +      -       -      +
     13B  ASP*     4.7     2.0    -      -       -      +
     17B  TRP*     3.4    62.2    -      -       +      +
     23B  ARG*     5.8     2.2    -      -       -      +
     27B  ILE      5.3     0.4    +      -       -      -
     28B  LEU*     5.0     0.2    -      -       -      +
     29B  PRO*     4.0    17.7    -      -       +      +
    118B  SER      4.8     0.7    -      -       -      +
    119B  GLN*     3.3    41.8    +      -       -      +
    120B  ASN      3.1     0.2    -      -       -      -
    121B  VAL*     1.4    84.0    -      -       +      +
    123B  ILE*     1.3    56.0    -      -       -      +
    125B  GLY      3.5     0.2    +      -       -      -
    126B  ALA*     3.1    27.7    +      -       -      +
    160B  GLU*     3.8    20.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  TYR*     4.9     2.0    -      -       +      -
      8B  LEU*     4.2     8.5    -      -       +      -
     11B  PHE*     3.7    32.5    -      -       +      -
     29B  PRO*     3.7    19.7    -      -       +      -
     30B  TRP      3.5    25.4    -      -       -      +
     31B  PRO*     4.0    25.1    -      -       +      -
     34B  VAL*     3.9    30.1    -      -       +      -
    120B  ASN*     3.2     9.2    +      -       -      +
    122B  ARG*     1.3    73.5    -      -       -      +
    124B  VAL*     1.3    65.6    +      -       -      +
    126B  ALA*     3.2     6.5    +      -       -      +
    127B  GLU*     3.0    33.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34B  VAL*     4.0     9.2    -      -       +      -
     36B  THR*     4.0    23.8    -      -       +      +
     74B  ILE*     4.2    14.1    -      -       +      -
    104B  VAL*     4.1    15.3    -      -       +      -
    106B  TRP*     3.6    42.2    -      -       +      -
    120B  ASN      3.3    16.5    +      -       -      +
    121B  VAL*     3.7     7.4    -      -       -      +
    123B  ILE*     1.3    72.9    -      -       -      +
    125B  GLY*     1.3    63.1    +      -       -      +
    127B  GLU*     3.3     3.1    +      -       -      +
    128B  VAL*     3.2    29.8    +      -       +      +
    157B  ALA*     4.2     9.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 125 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  VAL      2.9    15.7    +      -       -      -
    124B  VAL*     1.3    75.8    -      -       -      +
    126B  ALA*     1.3    63.4    +      -       -      +
    128B  VAL*     3.4     1.2    +      -       -      -
    129B  ALA*     3.1    20.1    +      -       -      +
    157B  ALA      3.4    25.0    +      -       -      -
    160B  GLU*     3.8    12.3    -      -       -      -
    161B  ALA*     3.5    16.9    -      -       -      +
    164B  ARG*     4.3     0.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 126 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8B  LEU*     3.6    25.5    -      -       +      +
     11B  PHE*     4.1     4.3    -      -       +      -
    122B  ARG      3.1    17.8    +      -       -      +
    123B  ILE      3.2     6.9    +      -       -      +
    125B  GLY*     1.3    77.6    -      -       -      +
    127B  GLU*     1.3    55.1    +      -       -      +
    129B  ALA*     3.9     1.6    -      -       -      +
    130B  TYR*     3.0    29.8    +      -       -      +
    164B  ARG*     3.6    35.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 127 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7B  ARG*     2.7    34.8    +      -       -      -
      8B  LEU*     3.9    20.8    -      -       +      +
     31B  PRO*     4.1    14.9    -      -       -      +
     36B  THR*     3.9    28.9    +      -       +      +
     38B  PHE*     3.8    25.1    -      -       +      -
    123B  ILE*     3.0    20.9    +      -       +      +
    124B  VAL      3.3     7.4    +      -       -      +
    126B  ALA*     1.3    72.9    -      -       -      +
    128B  VAL*     1.3    59.7    +      -       -      +
    130B  TYR*     3.3     4.0    +      -       -      +
    131B  LEU*     3.0    28.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38B  PHE*     3.9    23.1    -      -       +      -
     72B  PHE*     4.2    19.3    -      -       +      -
     74B  ILE*     4.3    20.2    -      -       +      -
    104B  VAL*     4.5    11.4    -      -       +      -
    124B  VAL*     3.2    15.1    +      -       +      +
    125B  GLY*     3.9     6.1    -      -       -      +
    127B  GLU*     1.3    72.2    -      -       -      +
    129B  ALA*     1.4    59.5    +      -       -      +
    131B  LEU*     3.1     6.1    +      -       -      +
    132B  VAL*     2.9    39.6    +      -       +      +
    148B  ILE*     4.0    28.3    -      -       +      -
    161B  ALA*     4.0     7.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125B  GLY      3.1    14.3    +      -       -      +
    126B  ALA      4.0     2.9    -      -       -      +
    128B  VAL*     1.4    76.9    -      -       -      +
    130B  TYR*     1.3    63.3    +      -       -      +
    132B  VAL*     3.2    13.7    +      -       -      +
    133B  GLY*     2.9    21.3    +      -       -      -
    161B  ALA*     3.6    23.7    -      -       -      +
    164B  ARG*     3.7    21.5    -      -       +      +
    165B  THR*     3.8     6.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7B  ARG*     3.4    71.2    -      -       +      +
      8B  LEU*     4.1     8.5    -      -       +      -
     54B  ALA*     3.8    28.8    +      -       +      -
    126B  ALA      3.0    20.8    +      -       -      +
    127B  GLU*     3.4     6.1    -      -       -      +
    128B  VAL      3.2     0.2    -      -       -      -
    129B  ALA*     1.3    76.9    -      -       -      +
    131B  LEU*     1.3    61.0    +      -       -      +
    133B  GLY*     3.3     1.4    +      -       -      -
    134B  VAL*     3.1    34.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38B  PHE*     3.9    38.6    -      -       +      -
     52B  ILE*     4.4    16.8    -      -       +      -
     53B  VAL      4.5     1.1    -      -       -      +
     54B  ALA*     3.6    35.9    -      -       +      +
     59B  ILE*     3.8    21.5    -      -       +      -
     72B  PHE*     4.0    19.5    -      -       +      -
    102B  ILE*     4.6     2.9    -      -       +      -
    127B  GLU      3.0    14.1    +      -       -      +
    128B  VAL*     3.6     8.1    -      -       -      +
    130B  TYR*     1.3    75.7    -      -       -      +
    132B  VAL*     1.4    61.0    +      -       -      +
    134B  VAL*     3.1     4.4    +      -       +      +
    135B  LEU*     3.1    27.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72B  PHE*     4.2    18.6    -      -       +      -
    128B  VAL*     2.9    40.3    +      -       +      +
    129B  ALA*     3.2     9.8    +      -       -      +
    131B  LEU*     1.4    69.8    -      -       -      +
    133B  GLY*     1.3    65.3    +      -       -      +
    135B  LEU*     3.2    11.6    +      -       -      +
    136B  GLN*     3.0    24.6    +      -       -      +
    141B  TYR      5.0     0.5    -      -       -      +
    143B  PRO*     5.1    12.2    -      -       +      +
    146B  VAL*     4.4    20.0    -      -       +      -
    148B  ILE*     5.4     0.4    -      -       +      -
    165B  THR*     3.8    28.0    -      -       +      +
    169B  VAL*     4.8     6.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129B  ALA      2.9    14.2    +      -       -      -
    130B  TYR*     3.8     4.0    -      -       -      -
    131B  LEU      3.3     0.2    -      -       -      -
    132B  VAL*     1.3    79.5    -      -       -      +
    134B  VAL*     1.3    60.5    +      -       -      +
    136B  GLN*     3.3    13.5    +      -       -      +
    137B  SER*     2.9    29.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 134 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54B  ALA*     4.0    37.5    -      -       +      +
     56B  PRO*     4.3    24.0    -      -       +      -
     59B  ILE*     4.4    12.1    -      -       +      -
    130B  TYR*     3.1    28.3    +      -       +      +
    131B  LEU*     3.1     9.7    +      -       +      +
    133B  GLY*     1.3    76.0    -      -       -      +
    135B  LEU*     1.4    62.0    +      -       -      +
    137B  SER*     4.6     4.7    -      -       -      -
    138B  SER*     2.9    26.4    +      -       -      +
    139B  PHE*     4.6     2.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  ILE*     6.4     0.9    -      -       +      -
     59B  ILE*     3.8    37.7    -      -       +      -
     64B  PHE*     4.0    31.0    -      -       +      -
     70B  THR*     5.2     1.8    -      -       +      +
     72B  PHE*     4.9    10.5    -      -       +      -
    102B  ILE*     5.8     0.9    -      -       +      -
    131B  LEU*     3.1    26.3    +      -       +      +
    132B  VAL*     3.2    15.0    +      -       +      +
    134B  VAL*     1.4    73.1    -      -       -      +
    136B  GLN*     1.3    63.7    +      -       -      +
    139B  PHE*     3.0    35.0    +      -       +      +
    141B  TYR*     3.2    36.2    +      -       +      +
    146B  VAL*     5.2     3.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 136 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  VAL*     3.0    11.8    +      -       -      +
    133B  GLY*     3.4    16.9    -      -       -      +
    135B  LEU*     1.3    79.4    -      -       -      +
    137B  SER*     1.3    63.3    +      -       -      +
    140B  ASP*     3.2    20.3    +      -       -      +
    141B  TYR      3.3    19.4    +      -       -      +
    142B  SER*     5.4     0.6    -      -       -      +
    143B  PRO*     3.5    32.9    -      -       +      +
    168B  ALA*     6.1     0.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 137 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  GLY      2.9    20.4    +      -       -      -
    134B  VAL*     4.0     4.7    -      -       -      -
    136B  GLN*     1.3    76.3    -      -       -      +
    138B  SER*     1.3    65.3    +      -       -      +
    140B  ASP*     4.7     4.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 138 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56B  PRO*     3.5    25.8    -      -       -      +
    134B  VAL*     2.9    21.1    +      -       -      +
    137B  SER*     1.3    77.3    -      -       -      +
    139B  PHE*     1.3    81.8    +      -       -      +
    140B  ASP      3.7     0.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 139 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56B  PRO*     3.4    35.0    -      -       +      -
     59B  ILE*     3.7    37.7    -      -       +      -
     60B  GLN*     4.4    21.5    -      -       +      -
     64B  PHE*     5.5     2.0    -      +       -      -
     66B  THR*     4.0    30.3    -      -       +      +
    134B  VAL*     4.4     2.9    -      -       +      -
    135B  LEU*     3.0    31.5    +      -       +      +
    138B  SER*     1.3    97.4    -      -       -      +
    140B  ASP*     1.3    71.8    +      -       -      +
    141B  TYR*     3.2     4.7    +      -       +      -
----------------------------------------------------------
 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