Contacts of the helix formed by residues 413 - 441 (chain A) in PDB entry 5UNJ


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 413 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    401A  GLY*     2.9    31.8    +      -       -      +
    402A  SER      4.2     1.8    -      -       -      +
    403A  ILE*     3.5    29.4    -      -       +      -
    411A  VAL      3.5     2.0    +      -       -      -
    412A  ASP*     1.3    71.2    -      -       -      +
    414A  SER*     1.3    57.7    +      -       -      +
    416A  ILE*     3.3     6.5    -      -       -      +
    417A  ALA*     2.7    48.5    +      -       +      +
    425A  ASN*     2.8    30.5    +      -       -      -
    428A  MET*     3.7    13.8    -      -       +      +
    429A  SER*     3.2    30.0    +      -       -      -
    432A  GLN*     3.8    24.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 414 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  ASP*     2.2    28.4    +      -       -      -
    413A  TYR*     1.3    84.7    -      -       -      +
    415A  ILE*     1.3    62.7    +      -       -      +
    417A  ALA*     3.9     3.4    -      -       -      +
    418A  SER*     2.9    29.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 415 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    411A  VAL*     6.1     2.2    -      -       +      -
    412A  ASP*     3.0    32.1    +      -       +      +
    413A  TYR      3.2     0.2    -      -       -      -
    414A  SER*     1.3    79.8    -      -       -      +
    416A  ILE*     1.3    64.1    +      -       +      +
    418A  SER*     3.2     8.4    +      -       -      -
    419A  GLN*     3.1    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 416 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  THR*     5.3     2.9    -      -       +      -
    345A  MET*     4.5     9.2    -      -       +      -
    403A  ILE*     4.1     7.2    -      -       +      -
    405A  LEU*     4.4    15.3    -      -       +      -
    411A  VAL*     3.7    31.6    -      -       +      -
    412A  ASP      3.2    11.8    +      -       -      +
    413A  TYR*     3.3    15.5    -      -       -      +
    415A  ILE*     1.3    77.3    -      -       +      +
    417A  ALA*     1.3    63.6    +      -       -      +
    419A  GLN*     3.3    17.4    +      -       -      +
    420A  ALA*     2.9    27.8    +      -       -      +
    428A  MET*     4.1    12.8    -      -       +      -
    601A  RJW      3.7    37.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 417 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  TYR*     2.7    38.2    +      -       +      +
    414A  SER*     3.9     5.4    -      -       -      +
    416A  ILE*     1.3    72.6    -      -       -      +
    418A  SER*     1.3    65.9    +      -       -      +
    420A  ALA*     3.2    15.7    +      -       -      +
    421A  GLY*     3.3    15.1    +      -       -      +
    425A  ASN*     3.3    33.2    -      -       -      +
    428A  MET*     4.4     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 418 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414A  SER      2.9    19.7    +      -       -      -
    415A  ILE*     3.4    10.2    -      -       -      -
    417A  ALA*     1.3    76.3    -      -       -      +
    419A  GLN*     1.3    64.2    +      -       -      +
    420A  ALA      3.1     1.2    +      -       -      -
    421A  GLY*     3.1    13.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 419 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  THR*     3.5    43.9    +      -       +      +
    342A  PHE*     4.8     7.8    +      -       -      +
    415A  ILE*     3.1    25.9    +      -       +      +
    416A  ILE*     3.3    22.0    +      -       -      +
    418A  SER*     1.3    76.3    -      -       -      +
    420A  ALA*     1.3    60.6    +      -       -      +
    421A  GLY      3.6     0.2    +      -       -      -
    601A  RJW      3.6     8.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 420 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  PHE*     5.5     2.4    -      -       -      +
    416A  ILE      2.9    17.0    +      -       -      +
    417A  ALA      3.6     6.1    -      -       -      +
    418A  SER      3.1     0.6    -      -       -      -
    419A  GLN*     1.3    78.8    -      -       -      +
    421A  GLY*     1.3    61.6    +      -       -      +
    424A  LEU*     3.5    26.9    -      -       +      +
    425A  ASN      4.4     0.2    -      -       -      +
    428A  MET*     3.7    23.3    -      -       -      -
    516A  TYR*     4.2     8.7    +      -       -      -
    601A  RJW      3.5    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 421 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  ALA      3.3     4.2    +      -       -      +
    418A  SER      3.1    13.9    +      -       -      -
    419A  GLN      3.4     1.2    +      -       -      -
    420A  ALA*     1.3    78.2    -      -       -      +
    422A  ALA*     1.3    66.3    +      -       -      -
    423A  THR      3.5     1.6    -      -       -      -
    424A  LEU      4.2     0.2    -      -       -      -
    425A  ASN*     3.0    25.7    +      -       -      +
    516A  TYR*     5.5     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 422 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  GLY*     1.3    72.7    -      -       -      -
    423A  THR*     1.3    66.2    +      -       -      +
    425A  ASN*     3.3     8.8    +      -       -      +
    426A  ASN*     3.1    21.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 423 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  GLY      3.5     0.6    -      -       -      -
    422A  ALA*     1.3    77.4    -      -       -      +
    424A  LEU*     1.3    65.5    +      -       -      +
    426A  ASN*     3.0    22.7    +      -       -      +
    427A  LEU*     3.3    15.6    +      -       +      +
    516A  TYR*     3.6    41.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 424 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  PHE*     4.1    10.1    -      -       +      -
    420A  ALA*     3.5    26.2    +      -       +      +
    421A  GLY      3.7     1.6    +      -       -      -
    422A  ALA      3.4     0.4    -      -       -      -
    423A  THR*     1.3    79.2    -      -       -      +
    425A  ASN*     1.3    59.0    +      -       -      +
    427A  LEU*     3.0    16.3    +      -       +      +
    428A  MET*     2.8    35.5    +      -       +      +
    513A  ALA*     5.4     4.0    -      -       +      +
    516A  TYR*     3.6    35.4    -      -       +      -
    517A  LEU*     5.4     2.5    -      -       +      -
    601A  RJW      3.8    69.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 425 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  TYR*     2.8    31.0    +      -       -      -
    417A  ALA*     3.3    31.1    -      -       +      +
    420A  ALA*     4.4     0.4    -      -       -      +
    421A  GLY      3.0    21.6    +      -       -      +
    422A  ALA*     3.5     8.2    +      -       -      +
    424A  LEU*     1.3    75.7    -      -       -      +
    426A  ASN*     1.3    58.0    +      -       -      +
    428A  MET*     3.3    10.3    +      -       -      -
    429A  SER*     2.8    30.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 426 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422A  ALA      3.1    10.2    +      -       -      +
    423A  THR*     3.0    14.2    +      -       -      +
    425A  ASN*     1.3    78.3    -      -       -      +
    427A  LEU*     1.3    68.9    +      -       -      +
    429A  SER*     3.3     7.1    +      -       -      -
    430A  HIS*     3.0    28.6    +      -       -      +
    512A  GLN*     5.3     5.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 427 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423A  THR*     3.3    19.7    +      -       +      +
    424A  LEU*     3.0    20.2    +      -       +      +
    426A  ASN*     1.3    83.8    -      -       -      +
    428A  MET*     1.3    67.2    +      -       -      +
    430A  HIS*     3.3     8.4    +      -       +      +
    431A  ALA*     3.0    23.2    +      -       -      +
    509A  ILE*     4.2    13.6    -      -       +      +
    512A  GLN*     3.4    41.3    -      -       +      +
    513A  ALA*     3.7    36.8    -      -       +      +
    516A  TYR*     5.1     1.8    -      -       +      -
    601A  RJW      3.7    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 428 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  HIS*     5.5     3.4    +      -       +      +
    403A  ILE*     4.5     8.1    -      -       +      -
    413A  TYR*     3.7    22.9    -      -       +      +
    416A  ILE*     4.1    23.1    -      -       +      -
    417A  ALA*     4.4     8.3    -      -       -      -
    420A  ALA*     3.7    27.1    -      -       -      -
    424A  LEU*     2.8    23.4    +      -       +      +
    425A  ASN*     3.6     7.9    -      -       -      +
    427A  LEU*     1.3    71.9    -      -       -      +
    429A  SER*     1.3    58.1    +      -       -      +
    431A  ALA*     3.3     3.6    +      -       -      +
    432A  GLN*     2.9    31.9    +      -       -      +
    601A  RJW      3.7    59.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 429 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  TYR*     3.2    13.0    +      -       -      -
    425A  ASN*     2.8    23.2    +      -       -      -
    426A  ASN*     3.6     8.7    -      -       -      -
    428A  MET*     1.3    71.5    -      -       -      +
    430A  HIS*     1.3    65.2    +      -       -      +
    432A  GLN*     3.1     8.8    +      -       -      +
    433A  GLU*     3.0    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 430 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426A  ASN*     3.0    15.8    +      -       -      +
    427A  LEU*     3.6    12.3    -      -       +      +
    429A  SER*     1.3    75.9    -      -       -      +
    431A  ALA*     1.3    62.2    +      -       -      +
    433A  GLU*     3.0    31.9    +      -       -      +
    434A  LEU*     3.2    30.8    +      -       +      +
    505A  GLU*     4.8    13.0    +      -       +      +
    508A  ALA*     6.0     2.0    -      -       +      +
    509A  ILE*     3.4    27.7    -      -       +      +
    512A  GLN*     5.1     7.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 431 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387A  ILE*     4.9     2.2    -      -       +      -
    390A  HIS*     4.4     6.7    -      -       +      +
    391A  ILE*     4.1    24.1    -      -       +      +
    427A  LEU      3.0    13.7    +      -       -      +
    428A  MET      3.5     8.1    -      -       -      +
    430A  HIS*     1.3    75.9    -      -       -      +
    432A  GLN*     1.3    58.9    +      -       -      +
    434A  LEU*     3.0     6.6    +      -       -      +
    435A  VAL*     2.9    30.2    +      -       -      +
    509A  ILE*     4.1    11.6    -      -       +      +
    601A  RJW      4.0    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 432 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  HIS*     4.1     7.1    +      -       -      -
    394A  GLN*     3.7    19.3    -      -       -      +
    399A  LYS      5.4     3.4    +      -       -      -
    401A  GLY      6.0     1.4    -      -       -      +
    402A  SER      4.4     7.9    +      -       -      -
    403A  ILE*     3.2    27.1    -      -       +      +
    413A  TYR*     3.8    20.9    -      -       +      -
    428A  MET      2.9    18.9    +      -       -      +
    429A  SER*     3.1    10.1    +      -       -      +
    431A  ALA*     1.3    75.9    -      -       -      +
    433A  GLU*     1.3    61.9    +      -       -      +
    435A  VAL*     3.2    19.0    +      -       -      +
    436A  ALA*     3.0    22.0    +      -       -      +
    439A  ARG*     6.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 433 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    429A  SER*     3.0    23.5    +      -       -      +
    430A  HIS*     3.0    27.9    +      -       -      +
    432A  GLN*     1.3    77.1    -      -       +      +
    434A  LEU*     1.3    65.3    +      -       +      +
    436A  ALA*     3.2     8.4    +      -       -      +
    437A  LYS*     3.1    39.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 434 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391A  ILE*     4.0    15.3    -      -       +      -
    430A  HIS*     3.3    39.7    -      -       +      +
    431A  ALA      3.0     9.0    +      -       -      +
    433A  GLU*     1.3    74.9    -      -       +      +
    435A  VAL*     1.3    65.9    +      -       -      +
    437A  LYS*     3.3    11.3    +      -       +      +
    438A  LEU*     2.9    34.2    +      -       +      +
    502A  ARG*     4.3     9.9    -      -       +      +
    505A  GLU*     3.7    31.4    -      -       +      +
    506A  ILE*     3.5    35.4    -      -       +      +
    509A  ILE*     4.2     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 435 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  HIS*     5.9     0.2    -      -       +      -
    391A  ILE*     3.7    22.4    -      -       +      +
    394A  GLN*     3.7    39.5    -      -       +      -
    395A  VAL*     3.9    16.9    -      -       +      +
    431A  ALA*     2.9    19.8    +      -       +      +
    432A  GLN*     3.4    21.3    -      -       -      +
    434A  LEU*     1.3    77.2    -      -       -      +
    436A  ALA*     1.3    62.4    +      -       -      +
    438A  LEU*     3.3     1.4    +      -       -      +
    439A  ARG*     3.0    47.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 436 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    432A  GLN      3.0    11.8    +      -       -      +
    433A  GLU*     3.2     9.8    +      -       -      +
    435A  VAL*     1.3    78.0    -      -       -      +
    437A  LYS*     1.3    64.2    +      -       +      +
    439A  ARG*     3.5    10.8    +      -       -      +
    440A  SER*     3.2    21.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 437 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433A  GLU*     3.1    29.3    +      -       -      +
    434A  LEU*     3.7    12.6    -      -       +      +
    436A  ALA*     1.3    77.5    -      -       +      +
    438A  LEU*     1.3    62.3    +      -       -      +
    440A  SER*     2.7    23.6    +      -       -      +
    441A  LEU*     3.1    16.0    +      -       +      +
    502A  ARG*     4.6    31.6    -      -       -      +
    505A  GLU*     5.3     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 438 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  LEU*     5.7     1.3    -      -       +      -
    391A  ILE*     3.6    31.4    -      -       +      -
    395A  VAL*     4.1     4.7    -      -       +      -
    434A  LEU*     2.9    21.6    +      -       +      +
    435A  VAL      3.9     3.4    -      -       -      +
    437A  LYS*     1.3    76.2    -      -       -      +
    439A  ARG*     1.3    62.6    +      -       -      +
    441A  LEU*     3.2    11.7    +      -       +      +
    443A  PHE*     3.0    60.8    +      -       +      +
    451A  LEU*     5.5     3.1    -      -       +      -
    499A  LEU*     3.8    28.5    -      -       +      -
    502A  ARG*     4.0    30.1    -      -       +      -
    506A  ILE*     5.5     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 439 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    394A  GLN*     3.2    16.6    +      -       -      +
    395A  VAL*     3.6    38.3    +      -       +      +
    396A  VAL      4.6     2.4    +      -       -      -
    398A  GLY*     2.6    31.7    +      -       -      -
    399A  LYS*     4.4     7.8    +      -       -      +
    400A  GLU*     5.1     7.3    +      -       -      -
    432A  GLN*     6.1     0.2    -      -       -      +
    435A  VAL*     3.0    34.4    +      -       -      +
    436A  ALA*     3.6     9.9    -      -       -      +
    437A  LYS      3.3     0.2    -      -       -      -
    438A  LEU*     1.3    77.2    -      -       -      +
    440A  SER*     1.3    58.6    +      -       -      +
    442A  GLN*     2.9    23.0    +      -       -      +
    443A  PHE      5.0     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 440 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436A  ALA      3.2     9.5    +      -       -      -
    437A  LYS*     2.7    24.3    +      -       -      -
    439A  ARG*     1.3    79.3    -      -       -      +
    441A  LEU*     1.3    63.5    +      -       -      +
    442A  GLN*     3.5     5.4    +      -       -      +
    492A  GLN*     3.9    11.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 441 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437A  LYS*     3.1    16.2    +      -       +      +
    438A  LEU*     3.6    16.2    -      -       +      +
    439A  ARG      3.1     1.0    -      -       -      -
    440A  SER*     1.3    80.2    -      -       -      +
    442A  GLN*     1.3    64.6    +      -       -      +
    443A  PHE      4.5     1.3    -      -       -      +
    492A  GLN*     3.4    32.7    -      -       +      +
    495A  LYS*     3.0    32.0    +      -       +      +
    498A  GLN*     3.9    45.1    -      -       +      +
    499A  LEU*     4.4    15.3    -      -       +      -
    502A  ARG*     4.4     9.9    -      -       -      +
----------------------------------------------------------
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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