Contacts of the helix formed by residues 188 - 215 (chain A) in PDB entry 4WYV


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 188 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  GLU*     4.0    30.0    -      -       +      +
    186A  LEU*     6.1     0.2    -      -       +      -
    187A  LYS*     1.3    77.7    +      -       -      +
    189A  ASP*     1.3    63.5    +      -       -      +
    190A  SER*     2.9    24.2    +      -       -      -
    191A  LEU*     3.3    22.2    +      -       +      +
    192A  ARG*     3.0    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  LYS      3.2     6.8    -      -       -      +
    188A  ASN*     1.3    73.7    +      -       -      +
    190A  SER*     1.3    55.7    -      -       -      +
    192A  ARG*     2.5    37.8    +      -       -      +
    193A  LYS*     2.8    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  ASN*     2.9    12.4    +      -       -      -
    189A  ASP*     1.3    76.0    -      -       -      +
    191A  LEU*     1.3    58.5    +      -       -      +
    193A  LYS*     3.2     8.5    -      -       -      +
    194A  ARG*     3.0    37.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  GLU*     4.0    28.9    -      -       +      +
    141A  LEU*     4.0    25.6    -      -       +      -
    142A  SER*     3.8    22.7    -      -       -      +
    145A  LEU*     4.0    20.6    -      -       +      +
    181A  PHE*     5.4     0.4    -      -       +      -
    186A  LEU*     3.6    31.4    -      -       +      -
    188A  ASN*     3.3    21.5    +      -       +      +
    189A  ASP      3.1     0.4    -      -       -      -
    190A  SER*     1.3    81.5    -      -       -      +
    192A  ARG*     1.3    56.8    +      -       -      +
    194A  ARG*     3.3     3.8    +      -       +      +
    195A  TYR*     2.9    27.9    +      -       -      +
     14E  LEU*     5.8     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  LEU*     3.5    39.9    +      -       +      +
    187A  LYS*     3.7    13.3    +      -       -      +
    188A  ASN      3.0    12.2    +      -       -      +
    189A  ASP*     2.5    37.6    +      -       -      +
    191A  LEU*     1.3    72.1    -      -       -      +
    193A  LYS*     1.3    68.6    +      -       -      +
    195A  TYR*     3.3    11.0    +      -       +      +
    196A  ASP*     3.1    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  ASP      2.8    13.0    +      -       -      +
    190A  SER*     3.2    14.4    -      -       -      +
    192A  ARG*     1.3    75.3    -      -       -      +
    194A  ARG*     1.3    59.8    +      -       -      +
    196A  ASP*     2.9    35.4    +      -       -      +
    197A  GLY*     3.7     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96A  GLN*     3.5    23.4    +      -       -      +
    142A  SER*     4.1    19.1    +      -       -      -
    145A  LEU*     3.7    40.0    -      -       +      +
    146A  ILE*     3.8    25.1    -      -       -      +
    190A  SER*     3.0    19.2    +      -       -      +
    191A  LEU*     3.8     4.1    -      -       +      +
    193A  LYS*     1.3    77.3    -      -       -      +
    195A  TYR*     1.3    66.1    +      -       -      +
    197A  GLY*     3.0    15.9    +      -       -      +
    198A  LEU      3.6     2.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 195 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  LEU*     3.9    11.8    -      -       +      +
    178A  ASP*     3.3    17.1    +      -       -      -
    181A  PHE*     3.2    39.7    -      +       +      -
    182A  ARG*     3.8    26.7    +      -       -      +
    186A  LEU*     3.8    22.0    -      -       +      -
    191A  LEU      2.9    17.7    +      -       -      +
    192A  ARG*     3.5     9.6    -      -       +      +
    193A  LYS      3.2     0.4    -      -       -      -
    194A  ARG*     1.3    76.2    -      -       -      +
    196A  ASP*     1.3    70.0    +      -       -      +
    198A  LEU*     3.0    33.2    +      -       +      +
    199A  LYS*     4.1     1.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 196 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  ARG*     3.1    19.5    +      -       -      +
    193A  LYS*     2.9    21.1    +      -       -      +
    195A  TYR*     1.3    83.5    -      -       -      +
    197A  GLY*     1.3    59.9    +      -       -      +
    199A  LYS*     2.6    43.9    +      -       -      +
    200A  TYR*     4.0     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 197 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  LYS      3.7     2.2    +      -       -      -
    194A  ARG*     3.0    12.4    +      -       -      -
    196A  ASP*     1.3    77.2    -      -       -      +
    198A  LEU*     1.3    64.2    +      -       -      +
    200A  TYR*     3.0    29.6    +      -       -      +
    201A  ASP*     3.5     9.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 198 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  LEU*     3.9    14.6    -      -       +      +
    148A  ALA*     3.5    31.9    -      -       +      -
    174A  ILE*     4.2    16.6    -      -       +      -
    177A  LEU*     4.6     7.0    -      -       +      -
    178A  ASP*     4.0    17.7    -      -       -      +
    181A  PHE*     3.7    21.5    -      -       +      -
    194A  ARG      3.6     3.8    +      -       -      -
    195A  TYR*     3.0    37.7    +      -       +      +
    197A  GLY*     1.3    76.3    -      -       -      +
    199A  LYS*     1.3    56.6    +      -       -      +
    201A  ASP*     2.9    12.3    +      -       +      +
    202A  VAL*     2.9    32.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  ASP*     5.8     3.4    -      -       -      +
    195A  TYR      4.1     2.0    +      -       -      +
    196A  ASP*     2.6    45.6    +      -       -      +
    197A  GLY      3.2     1.0    +      -       -      -
    198A  LEU*     1.3    78.2    -      -       -      +
    200A  TYR*     1.3    91.0    +      -       +      +
    202A  VAL*     3.5    10.1    +      -       -      +
    203A  LYS*     3.0    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  ASP*     4.0     6.7    -      -       +      -
    197A  GLY*     3.0    18.9    +      -       -      +
    199A  LYS*     1.3   109.7    +      -       +      +
    201A  ASP*     1.3    61.5    +      -       -      +
    203A  LYS*     3.3    15.8    +      -       +      +
    204A  LYS*     3.0    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  LEU      4.7     0.3    -      -       -      +
    148A  ALA*     3.8    10.8    -      -       -      +
    149A  SER*     3.1    38.7    +      -       -      -
    152A  SER*     3.2    26.6    +      -       -      -
    174A  ILE*     4.4     8.5    -      -       +      -
    197A  GLY      3.5     6.2    +      -       -      +
    198A  LEU*     2.9    23.3    +      -       +      +
    200A  TYR*     1.3    76.1    -      -       -      +
    202A  VAL*     1.3    65.6    +      -       -      +
    204A  LYS*     3.4     2.6    +      -       -      +
    205A  VAL*     3.2    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  ILE*     3.6    24.5    -      -       +      +
    175A  ASN*     3.7    25.1    -      -       -      +
    178A  ASP*     4.0    30.1    -      -       +      +
    198A  LEU*     2.9    22.2    +      -       +      +
    199A  LYS*     3.6     9.6    -      -       -      +
    201A  ASP*     1.3    77.2    -      -       -      +
    203A  LYS*     1.3    63.3    +      -       -      +
    205A  VAL*     3.3     3.0    +      -       -      +
    206A  GLU*     3.1    30.4    +      -       +      +
    153D  ARG*     3.8    16.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199A  LYS      3.0    18.0    +      -       -      +
    200A  TYR*     3.6    17.9    -      -       +      +
    201A  ASP      3.3     0.2    -      -       -      -
    202A  VAL*     1.3    77.4    -      -       -      +
    204A  LYS*     1.3    64.1    +      -       -      +
    206A  GLU*     3.3     8.8    +      -       -      +
    207A  GLU*     2.6    58.7    +      -       +      +
    204D  LYS*     4.4     4.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  SER*     3.8    33.9    +      -       -      +
    153A  ARG*     4.6     9.3    -      -       -      +
    156A  VAL*     3.9    22.2    -      -       +      +
    200A  TYR      3.0    17.3    +      -       -      +
    201A  ASP*     3.8     6.1    -      -       -      +
    203A  LYS*     1.3    78.6    -      -       -      +
    205A  VAL*     1.3    58.0    +      -       -      +
    207A  GLU*     3.4    10.3    +      -       -      +
    208A  VAL*     3.0    31.4    +      -       +      +
    203B  LYS*     3.9    20.9    -      -       -      +
    207B  GLU*     3.6    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  SER*     3.6    31.4    -      -       -      +
    155A  SER*     4.0    13.7    -      -       -      +
    167A  PRO      4.2     4.5    -      -       -      +
    170A  ILE*     4.0    10.3    -      -       +      +
    171A  SER*     3.2    40.4    -      -       -      +
    174A  ILE*     4.4     6.7    -      -       +      -
    201A  ASP      3.2    16.6    +      -       -      +
    202A  VAL*     3.9     4.7    -      -       -      +
    203A  LYS      3.2     0.4    -      -       -      -
    204A  LYS*     1.3    77.9    -      -       +      +
    206A  GLU*     1.3    65.2    +      -       +      +
    208A  VAL*     3.4     8.0    +      -       -      +
    209A  VAL*     3.3    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171A  SER*     4.0     9.9    -      -       -      +
    175A  ASN*     3.4    22.0    +      -       -      +
    202A  VAL*     3.1    24.6    +      -       -      +
    203A  LYS*     3.8     7.6    -      -       -      +
    205A  VAL*     1.3    78.7    -      -       +      +
    207A  GLU*     1.3    58.8    -      -       +      +
    209A  VAL*     3.4     5.4    +      -       -      +
    210A  TYR*     3.1    26.0    +      -       -      +
     46D  HIS*     4.6     3.1    -      -       -      +
     47D  GLN*     5.0     1.4    +      -       -      -
    153D  ARG*     2.9    48.0    +      -       -      +
    156D  VAL*     4.4     5.5    -      -       +      +
    157D  ASN*     3.3    35.6    +      -       -      +
    160D  THR*     4.6     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203A  LYS*     2.6    57.2    +      -       +      +
    204A  LYS*     3.7     8.4    -      -       -      +
    206A  GLU*     1.3    78.0    -      -       +      +
    208A  VAL*     1.3    64.2    +      -       -      +
    210A  TYR*     3.4     9.5    +      -       +      +
    211A  ASP*     3.0    31.3    +      -       -      +
    156D  VAL*     4.6    12.5    -      -       +      +
    204D  LYS*     2.6    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  SER      5.6     0.2    -      -       -      +
    155A  SER*     3.7    23.8    -      -       -      +
    156A  VAL*     4.0    24.9    -      -       +      -
    159A  VAL*     3.9    21.1    -      -       +      -
    167A  PRO*     3.8    17.3    -      -       +      -
    204A  LYS*     3.0    21.3    +      -       +      +
    205A  VAL*     3.7     7.2    -      -       -      +
    206A  GLU      3.4     0.6    -      -       -      -
    207A  GLU*     1.3    75.4    -      -       -      +
    209A  VAL*     1.3    64.1    +      -       -      +
    211A  ASP*     3.2     5.4    +      -       -      +
    212A  LEU*     3.1    20.2    +      -       +      +
    210B  TYR*     3.6    20.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  PRO*     3.6    31.0    -      -       +      +
    168A  LEU*     4.1    21.3    -      -       +      +
    171A  SER*     3.9    14.1    -      -       -      +
    205A  VAL      3.3    13.6    +      -       -      +
    206A  GLU*     3.7     8.3    -      -       -      +
    207A  GLU      3.2     0.6    -      -       -      -
    208A  VAL*     1.3    76.4    -      -       -      +
    210A  TYR*     1.3    52.0    +      -       -      +
    212A  LEU*     3.1     9.4    +      -       -      +
    213A  SER*     2.8    39.9    +      -       -      +
    160D  THR*     3.3    31.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206A  GLU      3.1     7.7    +      -       -      +
    207A  GLU*     3.5    10.5    -      -       +      +
    209A  VAL*     1.3    75.4    -      -       -      +
    211A  ASP*     1.3    72.2    +      -       -      +
    213A  SER*     3.0     3.0    +      -       -      -
    214A  ILE*     2.8    46.9    +      -       +      +
    215A  ARG*     6.1     0.2    -      -       -      -
    156D  VAL*     3.5    42.4    -      -       +      -
    159D  VAL*     3.8    30.3    -      -       +      -
    160D  THR*     3.5    12.6    +      -       -      +
    204D  LYS*     5.6     8.1    -      -       -      -
    208D  VAL*     3.5    29.3    -      -       +      -
    211D  ASP*     2.6    39.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  GLU*     3.0    19.6    +      -       -      +
    208A  VAL      3.4     2.7    -      -       -      +
    210A  TYR*     1.3    89.1    -      -       -      +
    212A  LEU*     1.3    63.0    +      -       +      +
    214A  ILE*     3.7     1.6    -      -       -      +
    215A  ARG*     3.4    39.9    +      -       -      +
    210B  TYR*     2.6    38.6    +      -       -      +
    214B  ILE*     3.6    19.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  VAL*     4.0    30.7    -      -       +      -
    164A  TYR*     3.6    49.1    -      -       +      +
    167A  PRO*     4.0    17.9    -      -       +      -
    168A  LEU*     4.0    11.0    -      -       +      -
    208A  VAL*     3.1    14.0    +      -       +      +
    209A  VAL*     3.1     7.2    +      -       -      +
    211A  ASP*     1.3    78.3    -      -       +      +
    213A  SER*     1.3    65.9    +      -       -      +
    215A  ARG      3.2     2.6    +      -       -      -
    216A  GLY      3.2    15.4    +      -       -      -
    217A  PHE*     3.5    37.1    +      -       +      +
    210B  TYR*     5.5     0.9    -      -       -      +
    214B  ILE*     5.6     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  VAL*     2.8    22.3    +      -       -      +
    210A  TYR*     3.0     3.1    +      -       -      -
    212A  LEU*     1.3    73.7    -      -       -      +
    214A  ILE*     1.3    62.4    +      -       -      +
    215A  ARG      3.1     0.2    -      -       -      -
    216A  GLY*     3.1    13.4    +      -       -      +
    217A  PHE      4.8     7.0    -      -       -      +
    159D  VAL*     4.5     7.0    -      -       -      -
    160D  THR*     3.6    40.9    +      -       -      +
    164D  TYR*     4.8     9.6    +      -       -      -
    215D  ARG*     6.0     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210A  TYR*     2.8    56.4    +      -       +      +
    211A  ASP*     3.7    10.5    -      -       -      +
    213A  SER*     1.3    76.8    -      -       -      +
    215A  ARG*     1.3    75.9    +      -       +      +
    216A  GLY      3.5     0.2    -      -       -      -
    159D  VAL*     4.1    11.2    -      -       +      -
    164D  TYR*     6.0     0.9    -      -       -      -
    211D  ASP*     3.4    26.7    -      -       +      +
    212D  LEU*     3.9    22.2    -      -       +      +
    215D  ARG*     4.0    33.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  ASP*     3.4    33.4    +      -       -      +
    212A  LEU*     3.2     4.1    +      -       -      +
    213A  SER      3.1     0.4    -      -       -      -
    214A  ILE*     1.3    89.0    -      -       +      +
    216A  GLY*     1.3    65.1    +      -       -      +
    217A  PHE*     4.0    18.3    -      -       +      -
    214B  ILE*     3.3    55.9    +      -       -      +
    215B  ARG*     4.1    30.7    -      -       -      +
    216C  GLY      5.5     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