Contacts of the helix formed by residues 428 - 452 (chain A) in PDB entry 5E2Q


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 GLU 428 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427A  LEU*     1.3    75.5    -      -       -      +
    429A  GLU*     1.3    64.4    +      -       +      +
    430A  ASP*     4.3    14.1    -      -       +      +
    431A  ASP*     2.9    38.9    +      -       -      +
    432A  LYS*     3.3    10.7    +      -       -      +
    602A  ARG*     4.1    28.0    +      -       -      +
    603A  VAL      4.2    11.6    +      -       -      +
    604A  ARG*     3.3    43.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 429 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  ARG*     2.4    41.6    +      -       -      -
    427A  LEU      3.7     1.2    +      -       -      +
    428A  GLU*     1.3    77.9    +      -       +      +
    430A  ASP*     1.3    65.1    +      -       -      +
    431A  ASP      3.1     1.3    +      -       -      -
    432A  LYS*     2.5    44.6    +      -       -      +
    433A  ASP*     4.6     3.1    +      -       -      -
    602A  ARG*     5.4     5.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 430 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    428A  GLU*     3.2    11.9    -      -       +      +
    429A  GLU*     1.3    81.4    -      -       -      +
    431A  ASP*     1.3    66.5    +      -       -      +
    433A  ASP*     5.0     3.9    +      -       -      +
    434A  LEU*     4.7    11.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 431 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427A  LEU*     5.2     2.9    -      -       +      -
    428A  GLU*     2.9    29.6    +      -       +      +
    430A  ASP*     1.3    84.9    -      -       -      +
    432A  LYS*     1.3    53.9    +      -       -      +
    433A  ASP      3.3     2.5    -      -       -      -
    434A  LEU*     3.2     9.5    +      -       -      +
    435A  TYR*     2.7    36.1    +      -       -      +
    540A  TYR*     2.7    40.4    +      -       -      -
    544A  LEU*     3.8    25.3    -      -       +      +
    603A  VAL      4.7     3.3    -      -       -      +
    604A  ARG*     5.5     0.9    -      -       -      -
    605A  LEU      5.3     2.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 432 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  ARG*     3.5    35.8    +      -       +      +
    424A  LEU*     4.0    36.3    +      -       +      -
    427A  LEU*     3.6    27.8    +      -       +      +
    428A  GLU      3.3    10.2    +      -       -      +
    429A  GLU*     2.5    44.8    +      -       -      +
    431A  ASP*     1.3    76.7    -      -       -      +
    433A  ASP*     1.3    58.2    +      -       -      +
    435A  TYR*     3.3     3.7    +      -       -      +
    436A  ILE*     2.9    36.5    +      -       -      +
    602A  ARG*     4.9     9.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 433 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  ARG*     2.5    34.5    +      -       -      -
    429A  GLU      4.6     3.9    +      -       -      +
    430A  ASP      5.0     3.3    +      -       -      +
    431A  ASP      3.3     0.4    -      -       -      -
    432A  LYS*     1.3    77.3    -      -       -      +
    434A  LEU*     1.3    62.5    +      -       -      +
    436A  ILE*     3.9     9.6    -      -       -      +
    437A  LEU*     3.2    25.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 434 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430A  ASP      4.7    12.2    +      -       -      +
    431A  ASP*     3.2    12.4    +      -       -      +
    433A  ASP*     1.3    75.9    -      -       -      +
    435A  TYR*     1.3    65.3    +      -       -      +
    437A  LEU*     3.5     4.4    +      -       +      -
    438A  TRP*     3.3    54.5    +      -       +      +
    537A  ASP*     3.9    18.8    -      -       +      +
    540A  TYR*     4.3    15.0    -      -       +      -
    541A  VAL*     3.5    13.4    -      -       +      +
    544A  LEU*     6.1     0.2    -      -       +      -
    607A  ARG*     3.7    22.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 435 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    419A  THR*     4.7     0.7    -      -       +      -
    424A  LEU*     3.8    18.2    -      -       +      -
    427A  LEU*     3.7    23.6    -      -       +      -
    431A  ASP      2.7    20.8    +      -       -      +
    432A  LYS*     3.3     8.7    +      -       -      +
    434A  LEU*     1.3    73.1    -      -       -      +
    436A  ILE*     1.3    58.3    +      -       -      +
    439A  LYS*     2.8    67.2    +      -       +      +
    541A  VAL*     4.3    15.0    -      -       +      +
    544A  LEU*     3.9    19.0    -      -       +      +
    545A  ASN*     2.7    46.4    +      -       +      -
    548A  ARG*     2.7    38.1    +      -       -      -
      7B  PRO*     4.7     1.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 436 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  TYR      5.2     2.4    -      -       -      +
    419A  THR*     4.1    41.6    +      -       +      +
    421A  ARG*     3.6    41.3    -      -       +      +
    424A  LEU*     3.9    14.4    -      -       +      -
    432A  LYS      2.9    23.5    +      -       -      +
    433A  ASP*     3.9     9.6    -      -       -      +
    435A  TYR*     1.3    78.2    -      -       -      +
    437A  LEU*     1.3    63.0    +      -       -      +
    438A  TRP      3.3     0.9    +      -       -      -
    439A  LYS*     3.9     4.5    +      -       -      +
    440A  GLY      4.8     2.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 437 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433A  ASP      3.2    14.3    +      -       -      +
    434A  LEU*     3.9     7.4    -      -       +      +
    435A  TYR      3.3     0.4    -      -       -      -
    436A  ILE*     1.3    82.2    -      -       -      +
    438A  TRP*     1.3    93.8    +      -       +      +
    441A  PRO*     4.0     9.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 438 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434A  LEU*     3.3    38.4    +      -       +      +
    436A  ILE      3.2     0.2    -      -       -      -
    437A  LEU*     1.3   110.3    -      -       +      +
    439A  LYS*     1.3    67.7    +      -       -      +
    440A  GLY      3.3     2.9    -      -       -      -
    441A  PRO*     3.4    14.2    -      -       +      +
    442A  SER*     2.9    24.9    +      -       -      -
    530A  PHE*     3.9    24.2    -      +       -      -
    534A  ASP*     3.6    40.8    -      -       +      -
    537A  ASP*     3.6    25.2    +      -       +      +
    538A  VAL*     3.7    19.3    -      -       +      -
    541A  VAL*     3.6    22.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 439 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    416A  ALA*     2.7    33.6    +      -       -      +
    417A  TYR      3.9     5.6    -      -       -      -
    418A  ALA      3.4     6.3    +      -       -      -
    419A  THR*     3.2    31.6    +      -       +      +
    435A  TYR*     2.8    55.8    +      -       +      +
    436A  ILE      3.9     1.7    +      -       -      +
    437A  LEU      3.8     0.6    -      -       -      -
    438A  TRP*     1.3    76.9    -      -       -      +
    440A  GLY*     1.3    62.2    +      -       -      +
    442A  SER*     2.6    22.4    +      -       -      +
    443A  PHE*     3.1    30.1    -      -       +      -
    541A  VAL*     4.0     4.9    -      -       -      +
    545A  ASN*     4.6     6.7    -      -       -      +
    548A  ARG*     5.4     0.7    -      -       -      +
      5B  ILE*     6.1     1.3    -      -       +      -
      7B  PRO*     5.2     9.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 440 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  TYR*     3.5    30.6    +      -       -      -
    436A  ILE      4.8     2.0    +      -       -      -
    439A  LYS*     1.3    83.6    -      -       -      +
    441A  PRO*     1.3    69.1    -      -       -      +
    442A  SER      3.1     0.3    +      -       -      -
    443A  PHE*     3.2    40.1    -      -       -      -
    444A  ASP*     3.4     1.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 441 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  TYR*     3.3    23.8    -      -       +      +
    437A  LEU      4.0     7.9    -      -       -      +
    438A  TRP*     3.4    32.8    -      -       +      +
    440A  GLY*     1.3    89.2    -      -       -      +
    442A  SER*     1.3    60.7    +      -       -      +
    444A  ASP*     3.4     6.8    +      -       +      +
    445A  VAL*     3.4    26.0    +      -       -      +
    530A  PHE*     3.5    31.2    -      -       +      -
    538A  VAL*     5.0     1.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 442 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438A  TRP      2.9    15.9    +      -       -      -
    439A  LYS*     2.6    26.2    +      -       -      +
    440A  GLY      3.1     0.2    -      -       -      -
    441A  PRO*     1.3    78.2    -      -       -      +
    443A  PHE*     1.3    57.7    +      -       -      +
    445A  VAL*     3.3     6.6    +      -       -      +
    446A  GLN*     3.0    23.8    +      -       -      +
    538A  VAL*     4.1    25.9    -      -       -      +
    541A  VAL*     4.1    15.6    -      -       -      +
    542A  ASN*     4.3    18.6    +      -       -      +
    545A  ASN*     5.3     5.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 443 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  LEU*     3.9    30.1    -      -       +      -
    416A  ALA      4.1    15.0    -      -       -      -
    417A  TYR*     3.7    20.6    -      +       -      -
    439A  LYS*     3.1    32.5    -      -       +      -
    440A  GLY*     3.2    23.3    -      -       -      -
    442A  SER*     1.3    80.5    +      -       -      +
    444A  ASP*     1.3    62.7    +      -       -      +
    446A  GLN*     3.5    11.2    -      -       +      -
    447A  VAL*     2.7    36.9    +      -       +      +
    542A  ASN*     5.5     0.4    -      -       -      -
    545A  ASN*     5.9     5.2    -      -       -      +
      5B  ILE*     3.4    47.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 444 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339A  MET*     5.9     2.6    -      -       -      +
    342A  LYS*     2.5    34.7    +      -       -      -
    343A  PHE*     3.7    17.0    -      -       -      -
    408A  SER*     4.4     0.7    +      -       -      -
    413A  LEU*     3.7    22.4    -      -       +      +
    417A  TYR*     4.7     9.5    +      -       +      +
    440A  GLY      3.4     8.7    +      -       -      +
    441A  PRO*     3.5    13.9    -      -       +      +
    442A  SER      3.2     0.2    -      -       -      -
    443A  PHE*     1.3    91.0    -      -       +      +
    445A  VAL*     1.3    60.2    +      -       +      +
    447A  VAL*     4.2     1.6    -      -       -      +
    448A  GLY      3.6    13.0    +      -       -      -
    528A  PHE*     3.7    14.2    -      -       -      -
    530A  PHE*     6.4     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 445 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441A  PRO      3.4    15.5    -      -       -      +
    442A  SER*     3.3     6.5    +      -       -      +
    443A  PHE      3.2     0.2    -      -       -      -
    444A  ASP*     1.3    77.2    -      -       +      +
    446A  GLN*     1.3    65.2    +      -       -      +
    448A  GLY*     3.2     2.6    +      -       -      -
    449A  LEU*     3.1    30.6    +      -       +      +
    519A  SER*     5.0     6.1    -      -       -      -
    524A  VAL*     4.1    17.0    -      -       +      -
    525A  LEU*     4.6    12.8    -      -       +      -
    528A  PHE*     3.6    42.6    -      -       +      -
    530A  PHE*     3.8    17.9    -      -       +      -
    538A  VAL*     4.8     8.7    -      -       +      -
    542A  ASN*     6.0     1.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 446 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442A  SER      3.0    15.8    +      -       -      +
    443A  PHE*     3.2    12.8    +      -       +      +
    445A  VAL*     1.3    77.8    -      -       -      +
    447A  VAL*     1.3    57.0    +      -       +      +
    449A  LEU*     3.4     3.2    +      -       -      +
    450A  HIS*     2.8    34.3    +      -       +      +
    512A  GLU*     3.1    50.2    +      -       -      +
    515A  GLY*     3.4    19.5    -      -       -      +
    516A  LEU*     3.9     2.0    -      -       -      +
    519A  SER*     4.9     0.4    -      -       -      -
    542A  ASN*     3.0    34.5    +      -       -      +
    546A  MET*     4.0     9.2    -      -       +      +
    572A  ARG*     5.9     2.9    -      -       -      +
      3B  VAL*     6.0     1.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 447 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343A  PHE*     5.6     0.2    -      -       +      -
    373A  PHE*     5.3     1.6    -      -       +      -
    388A  ALA*     4.3    17.9    -      -       +      +
    389A  GLY*     4.2    19.3    -      -       -      -
    407A  VAL      5.0     0.9    -      -       -      +
    408A  SER*     3.8    28.9    -      -       -      +
    413A  LEU*     4.4    10.3    -      -       +      -
    443A  PHE*     2.7    26.2    +      -       +      +
    444A  ASP*     4.2     5.4    -      -       -      +
    446A  GLN*     1.3    73.4    -      -       +      +
    448A  GLY*     1.3    63.3    +      -       -      +
    450A  HIS*     3.4     5.8    +      -       -      +
    451A  ALA*     3.2    25.5    +      -       +      +
      3B  VAL*     4.1    20.0    -      -       +      +
      5B  ILE*     4.6     7.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 448 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343A  PHE*     4.4     6.5    -      -       -      -
    346A  LEU*     4.0    12.6    -      -       -      +
    373A  PHE*     3.5    22.4    -      -       -      -
    444A  ASP      3.6     9.2    +      -       -      -
    445A  VAL      3.2     7.2    +      -       -      -
    447A  VAL*     1.3    80.9    -      -       -      +
    449A  LEU*     1.3    59.3    +      -       -      +
    452A  LEU*     3.2    29.3    +      -       -      +
    528A  PHE*     4.5     1.6    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 449 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346A  LEU*     4.0    11.2    -      -       +      -
    445A  VAL*     3.1    19.3    +      -       +      +
    446A  GLN*     4.0     1.8    -      -       -      +
    448A  GLY*     1.3    73.7    -      -       -      +
    450A  HIS*     1.3    56.2    +      -       -      +
    453A  LEU*     2.9    38.9    +      -       +      +
    454A  GLY*     2.7    32.4    +      -       -      -
    514A  VAL*     4.5     0.8    -      -       -      +
    515A  GLY*     3.3    39.5    -      -       -      +
    518A  LEU*     3.7    27.4    -      -       +      +
    519A  SER*     3.7     7.2    -      -       -      +
    524A  VAL*     3.8    27.4    -      -       +      -
    528A  PHE*     5.2     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 450 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    446A  GLN*     2.8    21.6    +      -       +      +
    447A  VAL      3.4     4.9    +      -       -      +
    449A  LEU*     1.3    76.0    -      -       -      +
    451A  ALA*     1.3    57.0    +      -       -      +
    454A  GLY*     3.3     2.8    -      -       -      -
    455A  HIS*     3.0    40.8    +      -       -      -
    508A  GLU*     3.0    27.1    +      -       -      -
    511A  ALA*     3.4    23.7    -      -       +      +
    512A  GLU*     3.3    47.6    +      -       +      +
    515A  GLY*     4.8     1.2    -      -       -      -
    568A  HIS*     4.4     5.4    -      +       -      -
      2B  ARG      4.0     2.2    +      -       -      -
      3B  VAL*     3.5    30.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 451 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373A  PHE*     4.7     4.9    -      -       +      -
    390A  ILE      4.2    17.3    -      -       -      +
    391A  ASN*     2.7    27.8    +      -       +      -
    406A  ASN*     3.2    17.7    -      -       +      +
    407A  VAL      5.4     1.6    -      -       -      +
    447A  VAL*     3.2    15.3    +      -       +      +
    448A  GLY      4.5     0.7    -      -       -      +
    450A  HIS*     1.3    79.6    -      -       -      +
    452A  LEU*     1.3    57.9    +      -       -      +
    455A  HIS*     3.4    10.8    -      -       -      +
    456A  GLY      3.2    13.2    +      -       -      -
      3B  VAL*     4.4    10.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 452 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346A  LEU*     3.7    37.5    -      -       +      +
    347A  VAL*     3.8    23.3    -      -       +      -
    350A  ALA*     4.0    12.3    -      -       +      -
    354A  LEU*     5.0     1.9    -      -       -      +
    368A  PHE*     5.4     2.2    -      -       +      -
    371A  PRO*     3.6    32.5    -      -       +      -
    373A  PHE*     3.8    12.8    -      -       +      -
    404A  PHE*     4.6     3.5    -      -       +      -
    406A  ASN*     3.5    11.4    -      -       -      +
    448A  GLY      3.2    14.7    +      -       -      +
    451A  ALA*     1.3    78.7    -      -       -      +
    453A  LEU*     1.3    74.6    +      -       +      +
    456A  GLY*     3.3    24.3    -      -       -      +
----------------------------------------------------------
 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