Contacts of the helix formed by residues 67 - 90 (chain A) in PDB entry 1NYE


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 ASN 67 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  TYR*     4.8     6.5    -      -       -      -
     58A  THR      3.9     9.9    -      -       -      +
     59A  ARG*     4.1     9.9    -      -       -      -
     65A  GLY      3.2    10.0    -      -       -      +
     66A  THR*     1.3    83.8    -      -       -      +
     68A  PRO*     1.3    76.4    -      -       +      +
     69A  GLU*     3.2    14.4    +      -       -      +
     70A  GLU*     2.8    40.0    +      -       -      +
     71A  LEU*     3.5    24.2    +      -       -      +
    225B  LYS*     2.9    36.3    +      -       -      +
    245B  GLU*     5.0     0.3    -      -       -      +
    278B  ALA*     5.7     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 68 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  TYR*     4.8     9.4    -      -       +      -
     59A  ARG*     2.8    51.1    -      -       +      +
     67A  ASN*     1.3    84.2    -      -       +      +
     69A  GLU*     1.3    59.5    +      -       -      -
     71A  LEU*     3.3     5.7    +      -       +      +
     72A  ILE*     3.0    28.9    +      -       -      +
    275B  ALA*     3.6    23.4    -      -       +      +
    278B  ALA*     4.1     8.5    -      -       +      +
    279B  CYS*     3.9    21.3    -      -       -      +
    282B  MET*     5.7     0.2    -      -       +      -
    347B  VAL*     4.0    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  ARG*     2.5    50.5    +      -       -      +
     67A  ASN*     3.2    13.1    +      -       -      +
     68A  PRO*     1.3    74.2    -      -       -      +
     70A  GLU*     1.3    52.6    +      -       -      +
     72A  ILE*     3.1     7.8    +      -       -      +
     73A  GLY      2.8    29.8    +      -       -      -
    104A  VAL*     3.4    32.4    -      -       +      +
    106A  LEU*     3.1    44.1    -      -       +      +
    115A  ILE*     3.7    11.3    -      -       +      +
    223B  ILE*     5.9     0.4    -      -       +      -
    225B  LYS*     3.6    15.8    +      -       +      +
    347B  VAL*     5.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  THR*     2.7    32.7    -      -       -      +
     67A  ASN*     2.8    29.3    -      -       -      +
     68A  PRO      3.4     0.2    -      -       -      -
     69A  GLU*     1.3    72.4    -      -       -      +
     71A  LEU*     1.3    61.7    +      -       +      +
     73A  GLY*     3.2     2.1    +      -       -      +
     74A  ALA*     2.8    27.4    +      -       -      +
    225B  LYS*     3.9     9.4    -      -       +      +
    226B  LYS      3.9    16.2    -      -       -      +
    227B  GLY*     3.9     3.1    -      -       -      -
    244B  THR*     2.8    32.8    -      -       -      +
    245B  GLU*     3.2    10.9    +      -       -      +
    246B  SER*     2.8    39.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 71 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42A  VAL*     4.6    12.6    -      -       +      -
     49A  LEU*     4.4    20.2    -      -       +      -
     66A  THR*     3.3    32.3    -      -       +      -
     67A  ASN      3.5    12.1    +      -       -      +
     68A  PRO*     3.3     9.3    +      -       +      +
     69A  GLU      3.2     0.4    -      -       -      -
     70A  GLU*     1.3    81.6    -      -       +      +
     72A  ILE*     1.3    66.8    +      -       -      +
     74A  ALA*     3.3     6.0    +      -       -      +
     75A  ALA*     3.0    23.9    +      -       -      +
    244B  THR*     4.1     5.8    -      -       -      +
    248B  VAL*     5.5     0.9    -      -       +      -
    249B  LEU*     5.4     6.3    -      -       +      -
    271B  LEU*     3.8    18.8    -      -       +      +
    274B  ALA*     4.0    24.2    -      -       +      +
    275B  ALA*     3.8    17.7    -      -       +      +
    278B  ALA*     5.3     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 72 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  PRO      3.0    21.7    +      -       -      +
     69A  GLU*     3.4     9.9    -      -       -      +
     71A  LEU*     1.3    75.5    -      -       -      +
     73A  GLY*     1.3    59.9    +      -       -      +
     75A  ALA*     3.3     6.3    +      -       -      +
     76A  HIS*     2.9    27.9    +      -       -      +
    104A  VAL*     4.7     5.8    -      -       +      -
    115A  ILE*     4.9    14.8    -      -       +      -
    118A  ILE*     4.4    10.5    -      -       +      -
    147A  VAL*     5.0     1.2    -      -       +      +
    151A  LEU*     4.3    34.3    -      -       +      -
    272B  ILE*     5.1    12.8    -      -       +      -
    275B  ALA*     3.6    13.9    -      -       +      -
    347B  VAL*     3.6    34.8    -      -       +      -
    350B  VAL*     6.3     1.8    -      -       +      -
    351B  LEU*     6.3     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  GLU      2.8    10.9    +      -       -      -
     70A  GLU      3.2     4.4    +      -       -      -
     72A  ILE*     1.3    77.4    -      -       -      +
     74A  ALA*     1.3    60.4    +      -       -      +
     76A  HIS*     4.6     1.6    -      -       -      -
     77A  ALA*     3.0    21.0    +      -       -      +
    102A  ALA*     3.2    19.9    -      -       -      +
    104A  VAL*     3.6    21.3    -      -       -      -
    227B  GLY*     3.7    12.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  GLU      2.8    15.2    +      -       -      +
     71A  LEU*     3.6     7.2    -      -       -      +
     72A  ILE      3.2     0.2    -      -       -      -
     73A  GLY*     1.3    75.3    -      -       -      +
     75A  ALA*     1.3    57.7    +      -       -      +
     77A  ALA*     3.3     2.4    +      -       -      +
     78A  ALA*     2.9    31.7    +      -       -      +
    227B  GLY*     3.6    10.2    -      -       -      -
    228B  GLN      4.3     4.4    -      -       -      +
    242B  VAL*     4.0     5.6    -      -       +      +
    243B  SER      3.8    17.9    -      -       -      +
    244B  THR*     4.3     3.1    -      -       -      +
    249B  LEU*     4.3    12.8    -      -       +      -
    271B  LEU*     4.2    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  LEU      3.0    16.3    +      -       -      +
     72A  ILE      3.6     4.3    -      -       -      +
     74A  ALA*     1.3    77.1    -      -       -      +
     76A  HIS*     1.3    56.9    +      -       -      +
     78A  ALA*     3.3     3.4    +      -       -      +
     79A  CYS*     2.8    32.1    +      -       -      +
    147A  VAL*     4.4     2.0    -      -       +      -
    268B  PRO*     3.5    38.4    -      -       +      +
    271B  LEU*     3.8    11.2    -      -       +      +
    272B  ILE*     3.8    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 76 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  ILE      2.9    18.3    +      -       -      +
     73A  GLY*     3.9     3.6    -      -       -      +
     75A  ALA*     1.3    74.7    -      -       -      +
     77A  ALA*     1.3    65.6    +      -       -      +
     80A  PHE*     2.9    23.1    +      -       +      +
    102A  ALA*     4.5     3.8    -      -       +      -
    118A  ILE*     3.3    34.5    -      -       +      +
    120A  LEU*     3.6    28.1    -      -       +      +
    145A  CYS*     4.2     6.2    -      -       -      -
    147A  VAL*     3.5    28.7    -      -       +      +
    148A  SER*     2.6    30.4    +      -       -      -
    151A  LEU*     3.9     6.9    -      -       +      +
    155A  ILE*     3.8    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 77 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  GLY      3.0    19.0    +      -       -      +
     74A  ALA      3.7     3.8    -      -       -      +
     76A  HIS*     1.3    76.4    -      -       -      +
     78A  ALA*     1.3    54.6    +      -       -      +
     80A  PHE*     3.9     0.7    -      -       -      +
     81A  SER*     2.8    37.8    +      -       -      -
    100A  THR*     3.4    22.9    +      -       -      +
    101A  THR      4.6     0.2    -      -       -      -
    102A  ALA*     4.1    13.2    -      -       +      +
    120A  LEU*     4.6     5.2    -      -       -      -
    227B  GLY      4.2     0.2    -      -       -      +
    228B  GLN*     3.9    15.3    -      -       -      -
    229B  ALA*     3.6    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 78 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  ALA      2.9    11.9    +      -       -      +
     75A  ALA*     3.6     5.8    -      -       -      +
     77A  ALA*     1.3    75.4    -      -       -      +
     79A  CYS*     1.3    64.4    +      -       -      +
     81A  SER      3.5     0.3    +      -       -      -
     82A  MET*     3.2    14.0    +      -       -      +
    229B  ALA*     3.5     4.9    -      -       -      +
    242B  VAL*     3.1    32.3    -      -       +      -
    254B  TYR*     2.6    39.7    +      -       +      -
    267B  ASN      5.8     0.2    -      -       -      -
    268B  PRO*     4.3     9.0    -      -       +      -
    271B  LEU*     5.6     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 79 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  ALA      2.8    12.9    +      -       -      +
     76A  HIS      3.9     0.4    -      -       -      +
     78A  ALA*     1.3    69.8    -      -       -      +
     80A  PHE*     1.3    60.6    +      -       -      +
     82A  MET*     3.4     3.8    +      -       -      +
     83A  ALA*     2.9    26.2    +      -       -      +
    145A  CYS*     3.3    23.8    -      -       -      -
    146A  PRO*     3.4    13.7    -      -       -      -
    147A  VAL*     3.2    39.0    -      -       +      -
    259B  ARG*     2.9    33.8    +      -       -      +
    268B  PRO*     3.7     4.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 80 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  HIS*     2.9    17.6    +      -       +      +
     77A  ALA*     4.0     1.1    -      -       -      +
     79A  CYS*     1.3    76.5    -      -       -      +
     81A  SER*     1.3    62.3    +      -       -      +
     83A  ALA*     3.1     1.9    +      -       -      +
     84A  LEU*     2.8    34.8    +      -       +      +
    100A  THR*     4.1    28.3    -      -       +      -
    120A  LEU*     3.9    24.0    -      -       +      -
    122A  SER*     4.2    13.0    -      -       -      -
    138A  ILE*     3.9    24.2    -      -       +      -
    141A  ALA*     3.7    13.0    -      -       +      -
    142A  LYS*     3.2    45.1    -      -       +      -
    145A  CYS*     3.8    16.1    -      -       -      -
    157A  LEU*     4.6    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 81 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  ALA      2.8    22.9    +      -       -      -
     78A  ALA*     3.9     3.8    -      -       -      -
     79A  CYS      3.3     0.2    -      -       -      -
     80A  PHE*     1.3    78.8    -      -       -      +
     82A  MET*     1.3    64.3    +      -       -      +
     84A  LEU*     3.2     5.2    +      -       -      +
     85A  SER*     3.0    21.3    +      -       -      -
     98A  ILE*     3.7    24.0    -      -       -      +
    100A  THR*     3.0    23.2    +      -       -      +
    229B  ALA*     4.1     8.8    +      -       -      +
    231B  TRP*     4.0    13.4    -      -       -      -
    254B  TYR*     4.0     8.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 82 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78A  ALA      3.2    11.2    +      -       -      +
     79A  CYS      3.7     4.5    -      -       -      +
     81A  SER*     1.3    78.6    -      -       -      +
     83A  ALA*     1.3    65.0    +      -       -      +
     85A  SER*     3.1     6.0    +      -       -      -
     86A  LEU*     3.0    19.9    +      -       -      +
    231B  TRP*     4.1    26.2    -      -       +      -
    235B  ILE*     4.9     7.6    -      -       +      +
    254B  TYR*     3.6    27.5    +      -       +      -
    255B  GLY      4.0    23.8    -      -       -      +
    256B  PHE*     4.7     6.1    -      -       -      -
    259B  ARG*     3.7    32.3    -      -       +      +
    260B  PHE*     3.9    11.7    -      -       -      -
    268B  PRO*     5.1     0.9    -      -       +      -
    617D  PHE*     3.7    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 83 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  CYS      2.9    17.8    +      -       -      +
     80A  PHE      3.1     4.9    +      -       -      +
     82A  MET*     1.3    78.0    -      -       -      +
     84A  LEU*     1.3    56.4    +      -       -      +
     86A  LEU*     3.1     5.9    +      -       -      +
     87A  MET*     2.9    31.0    +      -       -      +
    141A  ALA*     3.9     9.4    -      -       +      -
    145A  CYS*     3.5    23.1    -      -       +      -
    615D  LEU*     3.8    17.7    -      -       +      -
    617D  PHE*     3.9    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 84 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  PHE*     2.8    27.5    +      -       +      +
     81A  SER*     3.6     6.7    -      -       -      +
     82A  MET      3.2     0.2    -      -       -      -
     83A  ALA*     1.3    73.7    -      -       -      +
     85A  SER*     1.3    66.7    +      -       -      +
     87A  MET      3.4     0.4    +      -       -      +
     88A  LEU*     3.1    39.2    +      -       +      +
     98A  ILE*     4.2    17.3    -      -       +      -
    124A  VAL*     3.8    27.4    -      -       +      -
    134A  PHE*     4.7     2.0    -      -       +      -
    137A  ILE*     3.8    16.8    -      -       +      -
    138A  ILE*     3.5    46.9    -      -       +      +
    141A  ALA*     3.7     9.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 85 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  SER      3.0     8.1    +      -       -      -
     82A  MET      3.1     8.9    +      -       -      -
     84A  LEU*     1.3    76.0    -      -       -      +
     86A  LEU*     1.3    65.0    +      -       -      +
     88A  LEU*     3.2     4.7    +      -       -      +
     89A  GLY*     2.9    18.9    +      -       -      -
     95A  PRO*     4.1    16.5    -      -       -      +
     98A  ILE*     4.2     0.4    -      -       -      +
    231B  TRP*     3.2    31.5    +      -       -      -
    233B  GLY      2.7    23.0    +      -       -      -
    234B  ASP*     3.4    12.5    -      -       -      -
    235B  ILE*     3.5     6.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 86 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  MET      3.0    11.3    +      -       -      +
     83A  ALA*     3.2    13.0    -      -       -      +
     85A  SER*     1.3    77.2    +      -       -      +
     87A  MET*     1.3    80.0    +      -       -      +
     89A  GLY*     2.8    17.7    +      -       -      -
     90A  GLU*     2.9    30.2    +      -       -      +
    235B  ILE*     3.3    26.5    -      -       +      +
    615D  LEU*     5.1     4.5    -      -       +      -
    616D  TYR      4.2    14.4    -      -       -      +
    617D  PHE*     4.3    20.0    -      -       +      -
    620D  HIS*     3.3    35.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 87 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  ALA      2.9    20.3    +      -       -      +
     84A  LEU      4.2     1.6    -      -       -      +
     85A  SER      3.4     0.2    -      -       -      -
     86A  LEU*     1.3    92.7    -      -       -      +
     88A  LEU*     1.3    64.4    +      -       -      +
     90A  GLU*     3.3    24.7    +      -       +      +
     91A  ALA*     3.3    20.3    +      -       -      +
    137A  ILE*     3.5    35.5    -      -       +      +
    140A  LYS*     4.4    25.1    -      -       +      +
    141A  ALA*     4.4    19.3    -      -       +      +
    615D  LEU*     4.0    30.1    -      -       +      -
    616D  TYR      5.8     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 88 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  LEU*     3.1    30.8    +      -       +      +
     85A  SER      3.4     7.4    -      -       -      +
     87A  MET*     1.3    76.0    -      -       -      +
     89A  GLY*     1.3    58.1    +      -       -      +
     91A  ALA*     3.3     3.4    +      -       -      +
     92A  GLY      3.1     4.2    +      -       -      -
     93A  PHE*     2.6    61.2    +      -       +      +
     95A  PRO*     3.3    41.1    -      -       +      -
    124A  VAL*     4.8     0.7    -      -       +      -
    126A  VAL*     3.9    14.4    -      -       +      -
    129A  ILE*     5.0     1.3    -      -       +      -
    134A  PHE*     4.0    26.5    -      -       +      -
    137A  ILE*     4.0    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 89 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  SER      2.9     8.7    +      -       -      -
     86A  LEU      2.8     8.7    +      -       -      -
     88A  LEU*     1.3    73.9    -      -       -      +
     90A  GLU*     1.3    56.7    +      -       -      +
     91A  ALA      2.8     4.3    -      -       -      -
     92A  GLY*     2.8    22.4    +      -       -      -
     93A  PHE      3.5    10.0    +      -       -      -
    235B  ILE*     4.0    16.8    -      -       -      -
    620D  HIS*     6.2     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 90 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  LEU*     2.9    36.9    +      -       +      +
     87A  MET*     3.3    29.4    -      -       +      +
     88A  LEU      3.5     0.2    -      -       -      -
     89A  GLY*     1.3    73.5    -      -       -      +
     91A  ALA*     1.3    57.3    +      -       -      +
     92A  GLY      3.5     0.2    -      -       -      -
    616D  TYR*     3.9    28.4    -      -       -      +
    620D  HIS*     5.4     7.3    -      -       +      -
----------------------------------------------------------
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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