Contacts of the helix formed by residues 174 - 196 (chain A) in PDB entry 3UVH


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 THR 174 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  LEU*     5.0     0.9    -      -       -      -
     96A  LEU*     3.0    21.5    -      -       -      +
     97A  ALA      4.3     2.7    -      -       -      +
     98A  ALA*     4.0    15.2    -      -       -      +
    169A  ASP*     3.9    27.9    -      -       +      +
    172A  GLU*     3.9    12.8    -      -       +      +
    173A  LEU*     1.3    78.9    -      -       -      +
    175A  LEU*     1.3    68.6    +      -       -      +
    176A  ALA*     3.5    17.4    +      -       -      +
    177A  ASP*     2.9    24.8    +      -       -      +
    178A  CYS*     3.3    13.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  ARG*     5.4     0.7    -      -       -      +
     33A  VAL*     3.8    35.2    -      -       +      +
     81A  MET*     4.0    37.1    -      -       +      +
     85A  GLU*     3.8    26.9    -      -       +      +
     96A  LEU*     2.9    31.6    +      -       +      +
     97A  ALA*     3.7    26.0    -      -       +      +
     98A  ALA      5.2     0.7    -      -       -      +
    104A  ASN*     5.4     2.7    -      -       -      +
    174A  THR*     1.3    70.9    -      -       -      +
    176A  ALA*     1.3    62.8    +      -       -      +
    178A  CYS*     2.9    20.6    +      -       -      +
    179A  ASN*     3.1    12.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  ALA*     4.6     2.4    -      -       +      +
    103A  SER*     3.4    32.5    -      -       -      +
    104A  ASN*     3.6    21.3    +      -       -      +
    108A  LEU*     5.9     0.2    -      -       -      +
    168A  LEU*     3.7    10.0    -      -       +      +
    174A  THR*     3.6    11.4    -      -       -      +
    175A  LEU*     1.3    77.6    -      -       -      +
    177A  ASP*     1.3    62.9    +      -       -      +
    179A  ASN*     3.3     9.4    +      -       -      +
    180A  LEU*     3.2    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  MET*     4.8     0.4    -      -       +      -
    167A  PHE*     3.8     6.5    -      -       -      +
    168A  LEU*     3.2    17.3    +      -       -      +
    169A  ASP      5.0     0.3    +      -       -      -
    172A  GLU      3.9     0.9    -      -       -      +
    173A  LEU*     3.3    32.1    -      -       +      -
    174A  THR*     2.9    35.5    +      -       -      +
    176A  ALA*     1.3    75.7    -      -       -      +
    178A  CYS*     1.4    58.5    +      -       -      +
    180A  LEU      4.5     0.2    -      -       -      +
    181A  LEU*     2.9    38.5    +      -       +      +
    209A  TYR*     2.8    40.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  ARG*     3.2    35.7    -      -       +      +
     32A  MET*     3.7    27.1    -      -       +      -
     33A  VAL*     3.8    20.6    -      -       +      -
     36A  LEU*     3.4    33.0    -      -       -      -
    174A  THR      3.6     8.1    -      -       -      -
    175A  LEU*     2.9    12.9    +      -       -      +
    177A  ASP*     1.4    77.8    -      -       -      +
    179A  ASN*     1.3    56.1    +      -       -      +
    182A  PRO*     3.0    18.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  PRO*     5.3     1.0    -      -       -      +
     29A  ARG*     3.5    46.7    +      -       -      +
     81A  MET*     6.3     0.4    -      -       -      -
    104A  ASN      5.5     0.2    +      -       -      -
    108A  LEU*     3.8    27.3    -      -       +      +
    175A  LEU      3.1     9.3    +      -       -      +
    176A  ALA*     3.6     9.9    -      -       -      +
    177A  ASP      3.1     0.4    -      -       -      -
    178A  CYS*     1.3    76.4    -      -       -      +
    180A  LEU*     1.3    65.3    +      -       -      +
    182A  PRO*     3.5     8.5    -      -       -      +
    183A  LYS*     2.7    44.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  ALA      3.7    16.6    -      -       -      +
    107A  GLY*     3.5    28.7    -      -       -      +
    108A  LEU*     4.0    15.5    -      -       +      -
    140A  LEU*     3.8    19.5    -      -       +      -
    168A  LEU*     3.7    20.0    -      -       +      -
    176A  ALA      3.2    14.1    +      -       -      +
    179A  ASN*     1.3    78.2    -      -       -      +
    181A  LEU*     1.3    56.4    +      -       -      +
    183A  LYS*     3.0    12.2    +      -       +      +
    184A  LEU*     2.8    57.2    +      -       +      +
    209A  TYR*     4.0    11.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  MET*     4.2    12.1    -      -       +      -
    173A  LEU*     4.2    12.1    -      -       +      -
    177A  ASP*     2.9    36.3    +      -       +      +
    180A  LEU*     1.3    77.3    -      -       -      +
    182A  PRO*     1.4    66.8    -      -       +      +
    184A  LEU*     3.3     3.7    +      -       +      +
    185A  HIS      3.0    19.6    +      -       -      -
    209A  TYR*     3.4    34.3    -      -       +      +
    210A  LEU*     4.3    13.7    -      -       +      -
    213A  ALA*     3.4    36.1    -      -       +      -
    219A  PHE*     3.5    29.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  PRO*     3.7    26.9    -      -       +      +
     28A  GLN*     3.5    43.7    -      -       +      +
     29A  ARG      4.0     3.4    -      -       -      +
     32A  MET*     4.1     7.0    -      -       -      -
    178A  CYS      3.0    27.1    -      -       -      +
    179A  ASN      3.5     6.7    -      -       -      +
    181A  LEU*     1.4    93.0    -      -       +      +
    183A  LYS*     1.3    60.8    +      -       -      +
    185A  HIS*     3.5     4.7    -      -       +      +
    186A  ILE*     3.3    28.1    +      -       -      +
    219A  PHE*     4.3     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  PRO*     3.9    16.6    -      -       +      -
     26A  PHE*     4.6    21.5    -      -       -      -
     29A  ARG*     5.1     3.0    -      -       -      +
    108A  LEU*     4.2    17.8    +      -       +      +
    111A  PHE*     3.7    44.7    -      -       +      -
    179A  ASN*     2.7    42.8    +      -       -      +
    180A  LEU*     3.0    11.5    +      -       +      +
    182A  PRO*     1.3    75.1    -      -       -      +
    184A  LEU*     1.3    64.6    +      -       +      +
    186A  ILE*     3.2     6.8    +      -       -      +
    187A  VAL*     3.0    25.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  ILE*     4.0    39.3    -      -       +      -
    137A  LEU*     4.5     9.6    -      -       +      -
    140A  LEU*     3.8    22.0    -      -       +      -
    180A  LEU*     2.8    38.3    +      -       +      +
    181A  LEU*     3.8     5.4    -      -       +      +
    183A  LYS*     1.3    73.6    -      -       +      +
    185A  HIS*     1.3    57.6    +      -       -      +
    187A  VAL*     3.4     6.7    +      -       +      +
    188A  GLN*     2.9    33.9    +      -       -      +
    199A  ILE*     5.7     3.3    -      -       +      +
    206A  VAL*     5.3     3.6    -      -       +      -
    209A  TYR*     4.1    18.6    -      -       +      -
    210A  LEU*     4.1    25.1    -      -       +      -
    214A  TYR*     5.3     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  GLN*     4.8     2.0    -      -       -      -
    181A  LEU      3.0    16.7    +      -       -      +
    182A  PRO*     3.5     7.2    -      -       +      +
    184A  LEU*     1.3    73.2    -      -       -      +
    186A  ILE*     1.3    66.3    +      -       +      +
    188A  GLN*     3.4     2.9    +      -       -      +
    189A  VAL*     3.1    44.8    +      -       +      +
    210A  LEU*     5.5     0.2    -      -       -      +
    214A  TYR*     2.8    34.9    +      +       -      +
    219A  PHE*     3.8    10.7    -      -       +      -
    223A  CYS*     3.7    28.8    -      -       +      +
    224A  PRO*     3.6    18.3    +      -       +      -
    226A  ASP*     4.1     8.6    +      -       -      -
    229A  ILE*     3.3    34.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ASN*     3.6    24.9    -      -       -      +
     24A  CYS      5.1     0.4    -      -       -      -
     25A  PRO*     3.7    34.5    -      -       +      -
    111A  PHE*     3.9    13.0    -      -       +      -
    114A  PHE*     3.8    13.2    -      -       +      -
    182A  PRO      3.3    16.1    +      -       -      +
    183A  LYS      3.2     5.5    +      -       -      +
    185A  HIS*     1.3    74.5    -      -       +      +
    187A  VAL*     1.3    66.1    +      -       -      +
    189A  VAL      3.2     1.2    +      -       -      -
    190A  VAL*     2.9    28.3    +      -       +      +
    229A  ILE*     4.2    18.2    -      -       +      -
    233A  TYR*     3.7    34.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  ILE*     4.0    19.5    -      -       +      -
    111A  PHE*     4.0     7.9    -      -       +      -
    114A  PHE*     3.8    38.4    -      -       +      -
    133A  LEU*     4.6    13.9    -      -       +      -
    137A  LEU*     5.5     6.3    -      -       +      -
    183A  LYS      3.0    18.5    +      -       -      +
    184A  LEU*     3.5    11.2    -      -       +      +
    185A  HIS      3.3     0.2    -      -       -      -
    186A  ILE*     1.3    78.1    -      -       -      +
    188A  GLN*     1.3    65.1    +      -       +      +
    191A  CYS*     3.0    42.7    +      -       +      +
    197A  PHE*     5.5     2.2    -      -       +      -
    199A  ILE*     5.7     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184A  LEU      2.9    19.7    +      -       -      +
    185A  HIS*     3.7     5.2    -      -       -      +
    186A  ILE      3.3     0.2    -      -       -      -
    187A  VAL*     1.3    78.0    -      -       -      +
    189A  VAL*     1.3    65.9    +      -       +      +
    191A  CYS*     4.0     2.6    -      -       -      +
    192A  LYS*     3.1    52.0    +      -       -      +
    197A  PHE      4.7     0.5    -      -       -      +
    198A  THR*     6.3     0.4    -      -       -      +
    199A  ILE*     4.0    29.6    -      -       +      +
    207A  HIS*     4.8    10.9    -      -       -      -
    210A  LEU*     3.5    28.5    -      -       +      +
    214A  TYR*     3.6    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185A  HIS*     3.1    32.3    +      -       +      +
    186A  ILE      4.0     1.8    -      -       -      +
    188A  GLN*     1.3    75.7    -      -       +      +
    190A  VAL*     1.3    64.0    +      -       -      +
    192A  LYS*     3.5     8.1    +      -       +      +
    193A  LYS*     3.1    23.4    +      -       -      +
    226A  ASP*     3.5    33.9    -      -       +      +
    229A  ILE*     3.6    26.7    -      -       +      -
    230A  GLU*     3.7    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  PHE*     3.5    22.0    -      -       +      -
    118A  ILE*     4.1    11.7    -      -       +      -
    186A  ILE*     2.9    22.3    +      -       +      +
    189A  VAL*     1.3    74.1    -      -       -      +
    191A  CYS*     1.3    60.1    +      -       -      +
    193A  LYS*     3.2     1.7    +      -       -      -
    194A  TYR*     2.8    52.7    +      -       +      +
    229A  ILE*     3.6    18.6    -      -       +      +
    233A  TYR*     3.5    42.8    -      -       +      -
    237A  ALA*     4.9     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  PHE*     3.5    26.2    -      -       -      -
    117A  TYR*     4.2    10.3    -      -       -      -
    118A  ILE*     4.4     1.8    -      -       -      -
    133A  LEU*     3.9    17.5    -      -       -      -
    187A  VAL*     3.0    32.8    +      -       +      +
    188A  GLN*     4.2     1.8    -      -       -      +
    190A  VAL*     1.3    77.0    -      -       -      +
    192A  LYS*     1.3    61.7    +      -       -      +
    195A  ARG*     3.0    23.9    +      -       -      -
    196A  GLY      3.0     7.3    +      -       -      -
    197A  PHE*     3.1    33.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  GLN*     3.1    46.1    +      -       -      +
    189A  VAL*     3.7     8.1    -      -       +      +
    191A  CYS*     1.3    78.2    -      -       -      +
    193A  LYS*     1.3    64.8    +      -       -      +
    196A  GLY*     3.3    16.5    +      -       -      -
    197A  PHE      3.5    14.6    -      -       -      +
    198A  THR*     4.2    22.2    -      -       +      +
----------------------------------------------------------
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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  VAL      3.1    14.7    +      -       -      +
    190A  VAL      3.9     1.8    -      -       -      +
    192A  LYS*     1.3    82.0    -      -       -      +
    194A  TYR*     1.3    91.2    +      -       +      +
    196A  GLY      5.0     0.3    +      -       -      -
    230A  GLU*     3.4    39.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  ILE*     5.5     1.8    -      -       +      -
    190A  VAL*     2.8    38.7    +      -       +      +
    193A  LYS*     1.3    98.9    -      -       +      +
    195A  ARG*     1.3    79.0    +      -       +      +
    196A  GLY      3.8     0.2    -      -       -      -
    230A  GLU*     2.5    36.9    +      -       -      +
    233A  TYR*     4.1    12.6    -      -       +      -
    234A  GLU*     3.4    28.9    -      -       +      +
    237A  ALA*     3.3    31.0    -      -       +      -
    238A  LYS      6.3     0.2    -      -       -      -
    239A  ALA*     6.0     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 195 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  TYR*     3.2    67.8    +      -       +      +
    118A  ILE*     3.6    23.2    +      -       +      -
    120A  ASN      2.6    30.5    +      -       -      -
    126A  ASN*     3.6    11.3    +      -       -      +
    191A  CYS      3.0    12.2    +      -       -      +
    194A  TYR*     1.3    94.9    +      -       +      +
    196A  GLY*     1.3    64.6    +      -       -      +
    197A  PHE*     3.2     3.8    +      -       +      +
    237A  ALA*     6.3     0.2    -      -       -      -
    238A  LYS      2.7    26.0    +      -       -      +
    239A  ALA*     4.4     5.5    -      -       -      +
    240A  LEU*     3.8    17.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 196 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191A  CYS      3.0     3.4    +      -       -      -
    192A  LYS*     3.3    15.9    +      -       -      -
    193A  LYS      4.8     0.4    -      -       -      -
    194A  TYR      3.8     0.4    -      -       -      -
    195A  ARG*     1.3    78.4    -      -       -      +
    197A  PHE*     1.3    59.5    +      -       -      +
    198A  THR*     4.1     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