Contacts of the helix formed by residues 516 - 546 (chain A) in PDB entry 6M0X


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 516 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    515A  ASN*     1.3    78.2    -      -       -      +
    517A  ASP*     1.3    63.8    +      -       -      +
    518A  ASP*     3.4     5.4    -      -       +      +
    519A  GLU*     3.1    10.6    +      -       +      +
    520A  LYS*     2.9    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 517 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    515A  ASN      5.5     0.4    -      -       -      -
    516A  GLU*     1.3    73.4    -      -       -      +
    518A  ASP*     1.3    66.4    +      -       -      +
    519A  GLU      3.0     1.8    -      -       -      -
    520A  LYS*     3.9    22.4    -      -       +      +
    521A  LYS*     2.8    35.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 518 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    516A  GLU*     3.4     3.8    -      -       +      +
    517A  ASP*     1.3    77.3    -      -       -      +
    519A  GLU*     1.3    58.6    +      -       -      +
    521A  LYS*     3.6    10.0    +      -       -      +
    522A  ALA*     3.0    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 519 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    515A  ASN*     3.7    24.9    -      -       +      +
    516A  GLU*     3.1    13.2    +      -       +      +
    517A  ASP      3.0     0.2    -      -       -      -
    518A  ASP*     1.3    77.0    -      -       -      +
    520A  LYS*     1.3    57.4    +      -       -      +
    522A  ALA*     2.5    38.7    +      -       +      +
    523A  ILE*     2.9    12.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 520 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    515A  ASN*     3.5    30.3    -      -       +      +
    516A  GLU      2.9    18.0    +      -       -      +
    517A  ASP*     3.1    23.7    +      -       -      +
    519A  GLU*     1.3    70.7    -      -       -      +
    521A  LYS*     1.3    66.3    -      -       +      +
    522A  ALA      2.8     1.1    -      -       -      -
    523A  ILE*     2.9    23.8    +      -       +      +
    524A  GLN*     3.4    19.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 521 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    517A  ASP*     2.8    22.9    +      -       +      +
    518A  ASP*     3.8     9.4    -      -       -      +
    520A  LYS*     1.3    77.7    -      -       -      +
    522A  ALA*     1.3    60.9    +      -       -      +
    523A  ILE      3.2     0.7    +      -       -      -
    524A  GLN*     3.4    20.8    -      -       +      +
    525A  LYS*     3.3    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 522 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518A  ASP      3.0    12.5    +      -       -      +
    519A  GLU*     2.5    25.0    +      -       +      +
    521A  LYS*     1.3    80.5    -      -       -      +
    523A  ILE*     1.3    56.0    +      -       +      -
    525A  LYS*     4.4     5.2    -      -       -      +
    526A  ILE*     3.1    30.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    513A  GLU*     4.4    11.0    -      -       -      +
    515A  ASN*     4.2    22.4    -      -       +      +
    519A  GLU      2.9    14.0    +      -       -      +
    520A  LYS*     2.9    15.1    +      -       +      +
    522A  ALA*     1.3    77.5    -      -       -      +
    524A  GLN*     1.3    61.7    +      -       -      +
    525A  LYS      3.3     1.6    -      -       -      -
    526A  ILE*     3.2     7.9    +      -       -      +
    527A  GLN*     2.9    53.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  LYS*     4.9    12.3    -      -       +      +
    520A  LYS*     3.4    10.6    +      -       -      +
    521A  LYS*     3.4    37.8    +      -       +      +
    523A  ILE*     1.3    73.0    -      -       +      +
    525A  LYS*     1.3    60.6    +      -       -      +
    527A  GLN*     3.7    13.0    -      -       -      +
    528A  LYS*     2.7    35.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521A  LYS      3.3    17.1    +      -       -      +
    522A  ALA*     4.5     6.5    -      -       -      +
    524A  GLN*     1.3    79.6    -      -       -      +
    526A  ILE*     1.3    62.9    +      -       +      +
    528A  LYS*     3.6    11.2    +      -       +      +
    529A  ALA*     3.0    27.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522A  ALA*     3.1    23.1    -      -       +      +
    523A  ILE*     3.2     6.7    +      -       -      +
    524A  GLN      3.1     0.2    -      -       -      -
    525A  LYS*     1.3    79.9    -      -       +      +
    527A  GLN*     1.3    62.2    +      -       +      +
    528A  LYS      3.1     1.3    -      -       -      -
    529A  ALA*     3.0     9.6    +      -       +      +
    530A  ASN*     2.9    40.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  LYS*     3.1    37.9    +      -       -      +
    523A  ILE*     2.9    41.1    +      -       +      +
    524A  GLN*     4.0     8.2    -      -       -      +
    526A  ILE*     1.3    76.3    -      -       +      +
    528A  LYS*     1.3    59.6    +      -       -      +
    530A  ASN*     3.5     1.4    +      -       -      +
    531A  LYS*     3.3    17.7    +      -       -      +
      7B    A      4.3     4.1    -      -       -      -
      8B    G      3.3    70.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 528 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  LYS*     4.0    32.1    -      -       +      +
    342A  SER*     3.7    28.5    +      -       -      +
    524A  GLN      2.7    23.1    +      -       -      +
    525A  LYS*     3.8     9.4    -      -       +      +
    527A  GLN*     1.3    72.1    -      -       -      +
    529A  ALA*     1.3    59.6    +      -       -      +
    530A  ASN      3.2     0.4    -      -       -      -
    531A  LYS*     3.3     4.1    +      -       -      +
    532A  ASP*     2.7    56.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 529 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    525A  LYS*     3.0    17.2    +      -       +      +
    526A  ILE*     3.0    12.4    +      -       +      +
    528A  LYS*     1.3    78.3    -      -       -      +
    530A  ASN*     1.3    64.0    +      -       -      +
    532A  ASP*     3.6     9.6    -      -       -      +
    533A  GLU*     3.4    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 530 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    526A  ILE*     2.9    28.2    +      -       -      +
    527A  GLN*     3.6     7.4    -      -       -      +
    528A  LYS      3.2     0.2    -      -       -      -
    529A  ALA*     1.3    77.6    -      -       -      +
    531A  LYS*     1.3    62.7    +      -       -      +
    532A  ASP      3.3     0.5    +      -       -      -
    533A  GLU*     3.4    16.0    -      -       -      +
    534A  LYS*     3.1    21.1    -      -       -      +
    567A  ARG*     3.2    19.3    +      -       -      +
      8B    G      3.1    38.3    +      -       -      +
      9B    A      3.6    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 531 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  ASP*     5.1    12.3    -      -       -      +
    341A  LYS*     4.6    11.9    -      -       +      -
    527A  GLN      3.3    10.7    +      -       -      +
    528A  LYS*     3.3     8.2    +      -       -      +
    530A  ASN*     1.3    78.5    -      -       -      +
    532A  ASP*     1.3    62.8    +      -       -      +
    534A  LYS*     3.6    12.9    +      -       +      +
    535A  ASP*     3.2    40.1    +      -       -      +
      7B    A      4.2    34.6    +      -       -      +
      8B    G      4.0    17.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 532 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  SER*     4.8     4.9    +      -       -      -
    528A  LYS*     2.7    56.3    +      -       -      +
    529A  ALA*     3.6    10.5    -      -       -      +
    530A  ASN      3.1     0.6    -      -       -      -
    531A  LYS*     1.3    79.1    -      -       -      +
    533A  GLU*     1.3    57.3    +      -       -      +
    535A  ASP*     3.5    10.3    +      -       -      +
    536A  ALA*     2.9    26.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 533 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    529A  ALA      3.4    11.2    +      -       -      +
    530A  ASN*     3.4    21.3    -      -       -      +
    532A  ASP*     1.3    77.9    -      -       -      +
    534A  LYS*     1.3    61.4    +      -       -      +
    536A  ALA*     3.6     9.7    -      -       +      +
    537A  ALA*     2.7    30.8    +      -       -      +
    567A  ARG*     3.2    28.6    +      -       +      +
    570A  HIS*     4.8    10.6    -      -       +      +
    571A  GLN*     2.7    33.9    +      -       -      +
    655A  THR      5.3     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 534 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    530A  ASN      3.1    21.3    -      -       -      +
    531A  LYS*     3.7    16.6    -      -       +      +
    532A  ASP      3.3     0.2    -      -       -      -
    533A  GLU*     1.3    73.7    -      -       -      +
    535A  ASP*     1.3    63.4    +      -       -      +
    537A  ALA*     3.1     6.0    +      -       -      +
    538A  MET*     2.8    38.4    +      -       +      +
    563A  ALA*     5.8     3.4    -      -       -      +
    564A  THR*     6.3     3.4    -      -       -      -
    567A  ARG*     4.1    35.9    -      -       +      +
      8B    G      2.5    34.1    +      -       -      +
      9B    A      4.6     8.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 535 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    531A  LYS*     3.2    37.2    +      -       -      +
    532A  ASP*     3.7    10.8    -      -       -      +
    534A  LYS*     1.3    78.1    -      -       -      +
    536A  ALA*     1.3    54.6    +      -       -      +
    538A  MET*     3.8     7.3    -      -       -      +
    539A  LEU*     2.7    40.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 536 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532A  ASP      2.9    19.3    +      -       -      +
    533A  GLU*     3.6    11.7    -      -       +      +
    534A  LYS      3.2     0.2    -      -       -      -
    535A  ASP*     1.3    76.0    -      -       -      +
    537A  ALA*     1.3    57.4    +      -       -      +
    539A  LEU*     3.9     8.6    -      -       -      +
    540A  LYS*     3.1    28.1    +      -       -      +
    570A  HIS*     4.7    14.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 537 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    533A  GLU      2.7    21.5    +      -       -      +
    534A  LYS*     3.5     4.5    -      -       -      +
    536A  ALA*     1.3    72.7    -      -       -      +
    538A  MET*     1.3    60.5    +      -       -      +
    540A  LYS*     3.7     1.4    -      -       -      +
    541A  ALA      2.8    23.9    +      -       -      -
    563A  ALA      5.7     0.2    -      -       -      +
    566A  ILE*     3.3    27.1    -      -       +      +
    567A  ARG*     3.9    11.4    -      -       -      +
    569A  TRP*     4.8     1.2    -      -       -      -
    570A  HIS*     3.7    32.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 538 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    534A  LYS*     2.8    30.4    +      -       +      +
    535A  ASP*     3.8     7.0    -      -       -      +
    537A  ALA*     1.3    70.8    -      -       -      +
    539A  LEU*     1.3    55.2    +      -       -      +
    541A  ALA*     3.2     3.4    +      -       -      +
    542A  ALA*     2.8    37.5    +      -       -      +
    550A  GLU*     6.2     0.2    -      -       -      -
    551A  LEU*     4.3    11.9    +      -       +      +
    556A  PHE*     3.5    32.5    -      -       +      -
    563A  ALA*     4.0    31.9    -      -       +      +
    566A  ILE*     3.8    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 539 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    535A  ASP*     2.7    23.2    +      -       +      +
    536A  ALA*     3.9     8.3    -      -       -      +
    538A  MET*     1.3    71.9    -      -       -      +
    540A  LYS*     1.3    58.9    +      -       -      +
    542A  ALA*     3.2     5.8    +      -       -      +
    543A  ASN*     3.0    69.9    +      -       -      +
    549A  ALA*     4.3    23.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 540 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    536A  ALA      3.1    16.3    +      -       -      +
    537A  ALA*     3.7     4.0    -      -       -      +
    539A  LEU*     1.3    77.9    -      -       -      +
    541A  ALA*     1.3    66.9    +      -       -      +
    543A  ASN*     3.3     6.8    +      -       -      +
    544A  GLN*     2.9    49.0    +      -       +      +
    569A  TRP*     4.7     6.4    -      -       +      -
    570A  HIS*     3.3    37.5    +      -       +      +
    573A  GLY*     5.7     1.0    -      -       -      -
    574A  GLU*     2.2    41.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 541 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537A  ALA      2.8    21.5    +      -       -      +
    538A  MET      3.7     4.0    -      -       -      +
    540A  LYS*     1.3    73.5    -      -       -      +
    542A  ALA*     1.3    57.5    +      -       -      +
    544A  GLN*     3.5     3.3    +      -       -      +
    545A  TYR*     2.9    33.3    +      -       -      +
    551A  LEU*     4.0     7.4    -      -       +      -
    566A  ILE*     3.7    22.0    -      -       +      -
    569A  TRP*     4.5     2.8    -      -       +      -
    585A  ILE*     3.5    34.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 542 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    538A  MET      2.8    21.9    +      -       -      +
    539A  LEU      3.4     5.2    -      -       -      +
    540A  LYS      3.1     0.2    -      -       -      -
    541A  ALA*     1.3    72.6    -      -       -      +
    543A  ASN*     1.3    57.1    +      -       -      +
    546A  ASN*     2.7    32.1    +      -       -      +
    547A  GLY      3.0     3.8    +      -       -      -
    548A  LYS      3.1     6.0    -      -       -      +
    549A  ALA      3.6     3.6    -      -       -      -
    550A  GLU*     3.3    42.0    -      -       -      +
    551A  LEU*     3.7    13.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 543 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    539A  LEU*     3.0    37.4    +      -       -      +
    540A  LYS*     3.3     5.4    +      -       -      +
    542A  ALA*     1.3    73.2    -      -       -      +
    544A  GLN*     1.3    66.4    +      -       +      +
    545A  TYR      4.6     0.2    -      -       -      +
    547A  GLY*     3.1    27.6    +      -       -      +
    548A  LYS      2.4    40.3    +      -       -      -
    549A  ALA*     3.4     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 544 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540A  LYS*     2.9    49.8    +      -       +      +
    541A  ALA*     3.9     4.7    -      -       -      +
    543A  ASN*     1.3    78.3    -      -       +      +
    545A  TYR*     1.3    60.5    +      -       -      +
    569A  TRP*     4.1    12.4    -      -       +      -
    574A  GLU*     3.5    19.5    +      -       -      +
    584A  SER*     6.1     0.3    -      -       -      -
    585A  ILE*     4.2    13.9    +      -       +      +
    586A  HIS*     3.0    19.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 545 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541A  ALA      2.9    17.2    +      -       -      +
    542A  ALA      4.0     0.4    -      -       -      +
    544A  GLN*     1.3    80.5    -      -       -      +
    546A  ASN*     1.3    76.3    +      -       -      +
    547A  GLY      3.5     0.2    +      -       -      -
    551A  LEU*     3.6    22.7    -      -       +      -
    552A  PRO*     4.9     3.8    -      -       +      -
    555A  VAL*     4.1    23.1    -      -       +      +
    585A  ILE*     3.5    14.1    -      -       +      -
    586A  HIS*     3.5    39.1    -      +       -      -
    589A  ILE*     4.2    10.3    -      -       +      -
    590A  ASN*     2.7    42.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 546 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    542A  ALA      2.7    15.1    +      -       -      +
    545A  TYR*     1.3    86.3    -      -       +      +
    547A  GLY*     1.3    54.8    +      -       -      +
    548A  LYS*     3.0    21.2    +      -       +      +
    550A  GLU      3.6    11.5    +      -       -      +
    551A  LEU*     5.0     0.7    -      -       +      -
    552A  PRO*     3.3    37.8    -      -       +      +
----------------------------------------------------------
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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