Contacts of the helix formed by residues 431 - 455 (chain D) in PDB entry 5YD6


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 PRO 431 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    429D  ASP      4.4     2.2    -      -       -      +
    430D  LEU*     1.4    87.4    -      -       +      +
    432D  LYS*     1.3    66.1    +      -       -      +
    433D  ALA      3.2     1.8    -      -       -      +
    434D  ASP*     3.0    30.6    +      -       -      +
    435D  GLN*     3.1    10.2    +      -       -      +
    519D  LYS*     4.4    22.9    -      -       +      -
    520D  GLU*     3.9    28.9    -      -       +      -
    523D  ARG*     5.5     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 432 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418D  ARG*     5.0    14.3    -      -       -      +
    430D  LEU      3.5     1.8    +      -       -      -
    431D  PRO*     1.3    70.5    -      -       -      +
    433D  ALA*     1.3    57.9    +      -       -      +
    435D  GLN*     3.2    21.8    +      -       +      +
    436D  ASP*     2.8    63.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 433 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431D  PRO*     3.2     1.2    -      -       +      +
    432D  LYS*     1.3    79.2    -      -       -      +
    434D  ASP*     1.3    58.5    +      -       -      +
    436D  ASP*     3.5     7.0    +      -       -      +
    437D  LEU*     2.8    31.2    +      -       -      +
    519D  LYS*     4.0    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 434 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430D  LEU*     4.5    11.3    -      -       +      +
    431D  PRO*     3.0    21.4    +      -       +      +
    433D  ALA*     1.3    73.9    -      -       -      +
    435D  GLN*     1.3    57.9    +      -       -      +
    437D  LEU*     4.1     5.9    -      -       -      +
    438D  LEU*     2.7    41.4    +      -       -      +
    517D  GLY      4.3     1.9    -      -       -      +
    518D  LEU*     3.4    23.9    -      -       +      +
    519D  LYS*     2.8    33.0    +      -       -      +
    520D  GLU*     3.1    34.1    +      -       -      +
    524D  VAL*     5.0     1.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 435 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422D  GLU*     4.4    13.7    +      -       -      +
    427D  PHE*     3.4    60.4    +      -       +      +
    428D  ALA*     3.6    16.9    -      -       -      +
    430D  LEU*     3.2    20.4    -      -       +      +
    431D  PRO      3.1    11.2    +      -       -      +
    432D  LYS*     3.3    24.1    -      -       +      +
    434D  ASP*     1.3    76.5    -      -       -      +
    436D  ASP*     1.3    54.6    +      -       -      +
    438D  LEU*     5.1     0.2    -      -       -      -
    439D  PHE*     2.8    38.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 436 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418D  ARG*     5.2     7.1    +      -       -      -
    432D  LYS*     2.8    57.5    +      -       -      +
    433D  ALA*     3.8     6.3    -      -       -      +
    435D  GLN*     1.3    76.5    -      -       -      +
    437D  LEU*     1.3    55.9    +      -       -      +
    439D  PHE*     3.2     7.2    +      -       -      +
    440D  GLU*     2.7    57.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 437 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433D  ALA      2.8    22.0    +      -       -      +
    434D  ASP*     3.7     4.7    -      -       -      +
    436D  ASP*     1.3    71.5    -      -       -      +
    438D  LEU*     1.3    56.5    +      -       -      +
    440D  GLU*     4.0     3.3    -      -       +      +
    441D  SER*     2.7    48.7    +      -       -      +
    515D  ARG*     3.9    15.5    -      -       +      -
    516D  HIS      3.9     9.4    -      -       -      +
    517D  GLY      3.8    31.6    -      -       -      +
    518D  LEU*     3.8    20.6    -      -       +      +
    594D  ASP      5.3     9.2    -      -       -      +
    595D  THR*     5.7     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 438 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427D  PHE*     3.9    13.9    -      -       +      -
    430D  LEU*     3.6    30.7    -      -       +      -
    434D  ASP      2.7    25.6    +      -       -      +
    435D  GLN      3.8     2.2    -      -       -      +
    437D  LEU*     1.3    72.8    -      -       -      +
    439D  PHE*     1.3    64.5    +      -       -      +
    441D  SER*     4.1     2.9    -      -       -      -
    442D  ALA*     3.1    27.7    +      -       -      +
    511D  MET*     3.4    28.3    -      -       +      +
    512D  VAL*     4.7     6.1    -      -       +      -
    513D  THR      3.4    26.0    -      -       -      +
    515D  ARG*     3.9     8.9    +      -       +      -
    518D  LEU*     3.7    21.1    -      -       +      -
    524D  VAL*     4.0    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 439 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414D  MET*     3.5    25.1    -      -       +      -
    417D  ILE*     3.7    30.1    -      -       +      -
    418D  ARG*     3.7    54.1    -      -       +      -
    421D  ALA*     5.0     2.5    -      -       +      -
    427D  PHE*     4.6     5.2    -      -       +      -
    435D  GLN      2.8    22.4    +      -       -      +
    436D  ASP*     3.7     5.4    -      -       -      +
    438D  LEU*     1.3    72.8    -      -       -      +
    440D  GLU*     1.3    63.5    +      -       +      +
    442D  ALA*     3.6     1.0    -      -       -      +
    443D  PHE*     2.8    51.9    +      +       +      +
    446D  LEU*     5.1     0.8    -      -       +      +
    511D  MET*     3.8    17.6    -      -       -      -
    591D  LEU*     4.1    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 440 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436D  ASP*     2.7    41.0    +      -       -      +
    437D  LEU*     4.1     3.6    -      -       +      +
    439D  PHE*     1.3    82.4    -      -       +      +
    441D  SER*     1.3    58.9    -      -       -      +
    442D  ALA      3.4     0.3    +      -       -      -
    443D  PHE*     3.5     2.1    +      -       -      +
    590D  LYS*     4.7     4.9    +      -       -      -
    591D  LEU*     3.4    40.3    -      -       +      +
    594D  ASP*     2.6    41.1    -      -       +      +
    595D  THR*     3.7    13.2    +      -       -      +
    601D  8SU      2.8    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 441 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437D  LEU*     2.7    37.9    +      -       -      +
    438D  LEU      4.1     0.2    -      -       -      -
    440D  GLU*     1.3    76.5    -      -       -      +
    442D  ALA*     1.3    57.3    +      -       -      +
    443D  PHE      3.5     0.2    -      -       -      -
    445D  GLU*     4.0     1.6    -      -       -      +
    515D  ARG*     3.3    41.5    +      -       -      -
    595D  THR*     3.8    11.7    +      -       -      -
    601D  8SU      3.3    42.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 442 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438D  LEU      3.1    17.8    +      -       -      +
    439D  PHE      4.2     0.2    -      -       -      +
    441D  SER*     1.3    76.1    -      -       -      +
    443D  PHE*     1.3    67.9    +      -       -      +
    444D  LEU      3.3     2.2    -      -       -      -
    445D  GLU*     3.0    11.3    +      -       +      +
    446D  LEU*     2.9    27.9    +      -       +      +
    510D  ALA      3.4    26.9    -      -       -      +
    511D  MET*     3.8    15.5    -      -       +      -
    515D  ARG*     3.5     8.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 443 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410D  LEU*     3.3    32.8    -      -       +      -
    413D  SER*     4.3     0.9    -      -       -      -
    414D  MET*     3.5    28.0    -      -       +      -
    417D  ILE*     3.9    24.9    -      -       +      -
    439D  PHE*     2.8    32.8    +      +       +      +
    440D  GLU      3.5     6.2    +      -       -      +
    442D  ALA*     1.3    75.3    -      -       -      +
    444D  LEU*     1.3    70.8    +      -       +      +
    446D  LEU*     3.0    10.5    +      -       -      +
    447D  PHE*     2.8    34.1    +      +       +      -
    591D  LEU*     4.1    15.3    -      -       +      -
    601D  8SU      3.4    44.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 444 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410D  LEU*     3.6    29.6    -      -       +      -
    442D  ALA      3.3     0.6    -      -       -      -
    443D  PHE*     1.3    82.2    -      -       +      +
    445D  GLU*     1.3    61.4    +      -       -      +
    447D  PHE*     3.6     4.5    -      -       +      +
    448D  VAL*     3.0    35.3    +      -       -      +
    482D  TRP*     4.0    20.2    -      -       +      -
    566D  CYS*     3.5    36.6    -      -       -      +
    569D  GLY      4.0     6.1    -      -       -      -
    570D  LEU*     3.7    17.3    -      -       -      +
    573D  ILE*     4.3     7.0    -      -       +      -
    601D  8SU      3.1    38.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 445 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441D  SER      4.0     6.5    -      -       -      +
    442D  ALA*     3.0    10.0    +      -       -      +
    444D  LEU*     1.3    77.2    -      -       -      +
    446D  LEU*     1.3    58.1    +      -       -      +
    448D  VAL*     3.3     0.4    +      -       -      -
    449D  LEU*     2.9    28.4    +      -       -      +
    510D  ALA*     4.4    14.6    -      -       +      +
    515D  ARG*     3.8    15.0    +      -       -      -
    559D  LEU*     4.4     4.5    -      -       -      +
    562D  LEU*     3.2    42.6    -      -       +      +
    563D  ARG*     2.7    49.9    +      -       -      -
    566D  CYS*     3.7    23.3    -      -       +      +
    601D  8SU      4.2     3.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 446 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417D  ILE*     3.9    26.0    -      -       +      -
    420D  TRP*     3.4    45.8    -      -       +      -
    439D  PHE      5.1     1.1    -      -       -      +
    442D  ALA*     2.9    35.5    +      -       +      +
    443D  PHE*     3.4     7.0    -      -       -      +
    445D  GLU*     1.3    74.3    -      -       -      +
    447D  PHE*     1.3    66.3    +      -       -      +
    449D  LEU*     4.6     3.6    -      -       +      -
    450D  ARG*     3.1    39.5    +      -       -      +
    507D  ALA*     3.6    23.3    -      -       +      +
    510D  ALA*     4.5     6.5    -      -       +      -
    511D  MET*     4.0    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 447 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409D  LEU      3.3    28.5    -      -       -      -
    410D  LEU*     3.7    27.6    -      -       +      -
    413D  SER*     3.5    23.1    -      -       -      -
    417D  ILE*     3.6    11.3    -      -       +      +
    443D  PHE*     2.8    21.9    +      +       +      +
    444D  LEU*     3.6    12.1    -      -       +      +
    446D  LEU*     1.3    72.7    -      -       -      +
    448D  VAL*     1.3    73.2    +      -       +      +
    450D  ARG*     4.2     2.0    -      -       -      +
    451D  LEU*     3.2    38.2    +      -       +      +
    454D  ARG*     5.2     3.3    +      -       -      -
    464D  PHE*     4.0    29.2    -      +       -      -
    465D  CYS      6.2     0.2    -      -       -      -
    479D  PHE*     4.1    20.2    -      +       -      -
    482D  TRP*     4.8     7.0    -      +       -      -
    486D  ILE*     5.6     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 448 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444D  LEU      3.0    19.9    +      -       -      +
    445D  GLU*     3.9     3.4    -      -       -      +
    446D  LEU      3.3     0.2    -      -       -      -
    447D  PHE*     1.3    80.9    -      -       +      +
    449D  LEU*     1.3    61.4    +      -       -      +
    451D  LEU*     3.7     5.0    -      -       -      +
    452D  ALA*     2.8    28.8    +      -       -      +
    482D  TRP*     3.4    37.2    -      -       +      +
    486D  ILE*     4.3    19.0    -      -       +      +
    489D  PHE*     4.5     5.4    -      -       +      -
    562D  LEU*     3.8    10.5    -      -       +      -
    565D  LEU*     3.6    35.7    -      -       +      +
    566D  CYS*     5.6     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 449 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    445D  GLU      2.9    16.6    +      -       -      +
    446D  LEU*     4.0     5.6    -      -       +      +
    448D  VAL*     1.3    75.8    -      -       -      +
    450D  ARG*     1.3    60.0    +      -       +      +
    452D  ALA*     3.1     6.5    +      -       -      +
    453D  TYR*     2.8    30.1    +      -       -      +
    489D  PHE*     3.9    26.0    -      -       +      -
    493D  LEU*     4.1    12.1    -      -       +      +
    503D  PHE*     3.4    24.7    -      -       +      -
    506D  ILE*     4.0    15.9    -      -       +      +
    507D  ALA*     3.7    36.1    -      -       +      +
    510D  ALA*     4.5     3.6    -      -       +      -
    558D  LYS*     5.8     1.3    -      -       +      -
    562D  LEU*     3.7    23.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 450 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372D  HIS*     4.3     4.5    -      -       +      +
    375D  SER*     2.7    45.0    +      -       -      -
    376D  ASN*     3.0    21.1    -      -       -      +
    416D  ILE*     3.6    17.0    -      -       -      +
    417D  ILE*     3.6    25.1    -      -       -      +
    420D  TRP*     4.2    18.5    -      -       -      -
    446D  LEU*     3.1    35.5    +      -       +      +
    447D  PHE*     4.5     1.8    -      -       -      +
    449D  LEU*     1.3    77.0    -      -       +      +
    451D  LEU*     1.3    61.7    +      -       -      +
    453D  TYR*     3.4     2.3    +      -       -      +
    454D  ARG*     3.1    53.7    +      -       -      +
    465D  CYS*     4.5     5.5    -      -       -      +
    503D  PHE*     4.0    23.3    -      -       +      -
    507D  ALA*     5.3     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 451 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    447D  PHE*     3.2    35.9    +      -       +      +
    448D  VAL*     3.7     3.1    -      -       -      +
    450D  ARG*     1.3    74.5    -      -       -      +
    452D  ALA*     1.3    64.2    +      -       -      +
    454D  ARG*     3.9     9.3    -      -       -      +
    455D  SER*     2.7    46.1    +      -       -      +
    462D  LEU*     3.7    24.7    -      -       +      -
    463D  ILE      3.3    31.4    -      -       -      +
    464D  PHE*     3.8    30.5    -      -       +      -
    479D  PHE*     5.1     2.0    -      -       +      -
    486D  ILE*     4.0    19.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 452 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    448D  VAL*     2.8    21.5    +      -       +      +
    449D  LEU      3.4     5.4    -      -       -      +
    451D  LEU*     1.3    77.1    -      -       -      +
    453D  TYR*     1.3    57.0    +      -       -      +
    455D  SER      4.0     0.7    +      -       -      -
    486D  ILE*     4.7     4.7    -      -       +      +
    489D  PHE*     3.6    31.0    -      -       +      -
    490D  SER*     2.6    41.4    +      -       -      +
    493D  LEU*     3.8     5.2    -      -       +      -
    494D  GLN*     2.9    14.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 453 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370B  ARG*     4.4     3.5    +      -       -      -
    372D  HIS*     4.1    19.1    -      +       -      -
    449D  LEU      2.8     7.9    +      -       -      +
    450D  ARG      3.8     3.6    -      -       -      +
    451D  LEU      3.2     0.4    -      -       -      -
    452D  ALA*     1.3    78.0    -      -       -      +
    454D  ARG*     1.3    60.6    +      -       +      +
    493D  LEU*     4.0    13.7    -      -       +      -
    494D  GLN*     3.3    20.1    -      -       +      +
    498D  ILE*     2.8    36.3    +      -       +      -
    499D  ASP*     3.4    15.6    -      -       -      -
    500D  ILE*     3.4    14.3    +      -       +      +
    503D  PHE*     3.5    64.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 454 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    376D  ASN*     2.6    39.3    +      -       -      -
    377D  PRO*     3.6    18.8    -      -       -      +
    379D  MET*     3.4    44.6    -      -       +      +
    447D  PHE*     5.2     3.2    +      -       -      -
    450D  ARG*     3.1    35.3    +      -       -      +
    451D  LEU*     3.9    18.3    -      -       -      +
    453D  TYR*     1.3    78.1    -      -       -      +
    455D  SER*     1.3    67.5    +      -       -      +
    463D  ILE*     3.0    31.5    +      -       +      +
    464D  PHE*     3.4     4.8    +      -       -      +
    465D  CYS*     3.3    41.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 455 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    451D  LEU*     2.7    28.0    +      -       -      +
    452D  ALA*     4.0     0.8    +      -       -      -
    453D  TYR      3.6     0.8    -      -       -      +
    454D  ARG*     1.3    81.0    -      -       -      +
    456D  ASN*     1.3    59.9    +      -       -      +
    457D  PRO*     3.3     4.8    -      -       -      +
    461D  LYS      3.1    12.1    -      -       -      -
    462D  LEU*     3.2     9.6    -      -       -      +
    463D  ILE*     2.9    30.6    +      -       -      +
    490D  SER*     4.3    12.1    -      -       -      -
    494D  GLN*     2.8    22.5    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il