Contacts of the helix formed by residues 150 - 171 (chain A) in PDB entry 3OP5


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 SER 150 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  ASN*     5.2     2.6    -      -       -      +
    149A  PHE*     1.3    75.2    -      -       -      +
    151A  ARG*     1.3    59.1    +      -       -      +
    152A  LYS*     3.9     9.5    +      -       -      +
    153A  THR*     2.8    34.1    +      -       -      -
    154A  VAL*     2.9    28.2    +      -       -      +
    255A  LEU*     4.2     0.9    -      -       -      -
    340A  ASP*     4.9     4.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  SER*     1.3    71.5    -      -       -      +
    152A  LYS*     1.4    56.3    +      -       -      +
    154A  VAL*     3.5     1.0    +      -       -      +
    155A  LEU*     3.0    43.6    +      -       +      +
    255A  LEU*     3.7    21.9    -      -       +      +
    294A  ASN      6.0     0.4    +      -       -      -
    296A  PRO*     3.6    26.5    -      -       +      +
    297A  GLY      4.3     2.4    -      -       -      +
    298A  GLU*     2.7    43.1    +      -       -      +
    327A  GLY      4.1     2.8    +      -       -      -
    330A  ALA*     4.1    20.4    -      -       -      +
    331A  ILE*     3.7    33.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  SER*     3.2     8.7    -      -       -      +
    151A  ARG*     1.4    79.3    -      -       -      +
    153A  THR*     1.4    56.9    +      -       -      +
    155A  LEU*     3.9     1.0    -      -       -      +
    156A  GLN*     2.9    44.3    +      -       -      +
    328A  LEU*     3.8    12.7    -      -       +      +
    331A  ILE*     3.8    17.7    -      -       +      +
    333A  SER*     2.8    32.3    +      -       -      +
    334A  LYS      2.9    12.5    +      -       -      -
    336A  ASP*     2.7    34.3    +      -       -      -
    338A  LYS*     3.5    19.3    -      -       -      +
    340A  ASP*     3.7    25.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  LEU*     6.3     0.2    -      -       +      -
    149A  PHE*     3.9    20.2    -      -       +      -
    150A  SER*     2.8    30.3    +      -       -      -
    152A  LYS*     1.4    77.1    -      -       -      +
    154A  VAL*     1.4    52.5    +      -       -      +
    156A  GLN*     3.3     2.7    +      -       -      +
    157A  LEU*     2.8    53.0    +      -       +      +
    339A  LEU*     2.8    29.8    +      -       -      +
    340A  ASP*     3.5    13.3    +      -       -      +
    341A  LEU*     3.8    20.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  PHE*     3.7    12.1    -      -       +      +
    150A  SER      2.9    23.4    +      -       -      +
    151A  ARG      4.0     3.1    -      -       -      +
    153A  THR*     1.4    69.9    -      -       -      +
    155A  LEU*     1.3    57.0    +      -       +      +
    157A  LEU*     3.5     8.1    +      -       -      +
    158A  SER*     2.7    37.7    +      -       -      +
    251A  MET*     3.8    41.7    -      -       +      +
    254A  TRP*     3.7    31.0    -      -       +      -
    255A  LEU*     3.8    25.1    -      -       +      -
    299A  ILE*     5.0     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  ARG*     3.0    30.8    +      -       +      +
    152A  LYS      4.0     2.9    -      -       -      +
    154A  VAL*     1.3    76.9    -      -       +      +
    156A  GLN*     1.3    58.2    +      -       -      +
    158A  SER*     3.5     4.0    +      -       -      -
    159A  LEU*     3.0    36.0    +      -       -      +
    251A  MET*     5.9     0.4    -      -       -      -
    298A  GLU*     3.7    33.7    -      -       +      +
    299A  ILE*     5.2     5.2    -      -       +      -
    324A  LEU*     3.6    35.2    -      -       +      +
    327A  GLY      3.6    30.3    -      -       -      +
    328A  LEU*     3.7    22.4    -      -       +      +
    331A  ILE*     4.8     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  LYS*     2.9    46.6    +      -       -      +
    153A  THR      3.8     2.0    -      -       -      +
    155A  LEU*     1.3    72.2    -      -       -      +
    157A  LEU*     1.4    65.1    +      -       -      +
    159A  LEU*     3.6     4.3    +      -       -      +
    160A  ARG*     3.3    33.5    +      -       -      +
    328A  LEU*     3.3    16.6    -      -       +      +
    334A  LYS      3.2    10.9    -      -       -      +
    335A  ASP*     3.0    26.0    +      -       -      -
    337A  GLY*     3.4    19.7    -      -       -      +
    338A  LYS      3.2    20.2    -      -       -      +
    339A  LEU*     3.8    21.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  LEU*     3.7    37.9    -      -       +      -
    149A  PHE*     4.1    16.8    -      -       +      -
    153A  THR*     2.8    45.6    +      -       +      +
    154A  VAL      3.8     4.0    -      -       -      +
    156A  GLN*     1.4    72.0    -      -       -      +
    158A  SER*     1.3    57.6    +      -       -      +
    160A  ARG*     3.1     6.4    +      -       -      +
    161A  ILE*     3.0    34.1    +      -       +      +
    193A  VAL*     3.9    18.9    -      -       +      +
    254A  TRP*     4.1    20.9    -      -       +      -
    339A  LEU*     3.9    27.3    -      -       +      +
    341A  LEU      5.6     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154A  VAL*     2.7    22.7    +      -       -      +
    155A  LEU*     3.8     2.2    -      -       -      -
    157A  LEU*     1.3    71.8    -      -       -      +
    159A  LEU*     1.4    60.4    +      -       -      +
    161A  ILE*     3.8     9.3    -      -       -      +
    162A  LEU*     2.9    33.6    +      -       -      +
    247A  LEU*     3.9    11.4    -      -       -      +
    251A  MET*     3.3    32.2    -      -       -      +
    254A  TRP*     4.5     2.8    -      -       -      -
    324A  LEU*     3.6    22.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155A  LEU      3.0    22.9    +      -       -      +
    156A  GLN*     3.8     5.8    -      -       -      +
    157A  LEU      3.3     0.4    -      -       -      -
    158A  SER*     1.4    75.3    -      -       -      +
    160A  ARG*     1.3    79.2    +      -       -      +
    162A  LEU*     3.5     6.1    +      -       -      +
    163A  ASP*     3.3    25.1    +      -       -      +
    321A  ARG*     3.7    44.8    +      -       +      +
    324A  LEU*     3.9    17.0    -      -       +      +
    325A  LEU*     4.0    10.1    -      -       +      -
    328A  LEU*     3.8    22.2    -      -       +      -
    335A  ASP*     3.7    29.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  LEU*     6.0     0.6    -      -       -      +
    107A  TYR*     3.5    46.9    -      -       +      +
    109A  GLY      5.4     0.3    +      -       -      -
    156A  GLN*     3.3    24.3    -      -       -      +
    157A  LEU      3.1     8.1    +      -       -      +
    159A  LEU*     1.3    95.1    +      -       -      +
    161A  ILE*     1.3    62.8    +      -       -      +
    163A  ASP*     3.1    35.6    +      -       -      +
    164A  ILE*     3.1    26.9    +      -       +      +
    191A  ASP      5.5     1.3    -      -       -      +
    193A  VAL*     4.1    10.5    -      -       +      +
    321A  ARG*     5.7     3.4    -      -       -      +
    335A  ASP*     3.1    39.2    +      -       -      -
    337A  GLY*     4.6     6.6    -      -       -      -
    339A  LEU*     5.1     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  LEU*     3.0    27.4    +      -       +      +
    158A  SER      3.8     4.5    -      -       -      +
    160A  ARG*     1.3    73.5    -      -       -      +
    162A  LEU*     1.4    53.4    +      -       -      +
    164A  ILE*     3.1    14.0    +      -       +      +
    165A  LEU*     2.8    49.3    +      -       +      +
    178A  ILE*     4.2    14.6    -      -       +      -
    183A  LEU*     3.8    41.3    -      -       +      -
    193A  VAL*     5.0     4.5    -      -       +      -
    195A  LEU*     5.6     2.7    -      -       +      -
    247A  LEU*     3.8    30.7    -      -       +      -
    254A  TRP*     3.8    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  SER      2.9    17.8    +      -       -      +
    159A  LEU*     3.6     6.3    -      -       -      +
    160A  ARG      3.3     0.2    -      -       -      -
    161A  ILE*     1.4    76.1    -      -       -      +
    163A  ASP*     1.4    56.8    +      -       -      +
    165A  LEU*     4.0     2.6    -      -       +      +
    166A  GLU*     2.9    30.7    +      -       -      +
    244A  LEU*     3.7    30.1    -      -       +      -
    247A  LEU*     3.9    15.5    -      -       +      -
    302A  TYR*     4.4     8.5    -      -       +      +
    317A  TYR*     4.4     9.1    -      -       +      +
    320A  LEU*     3.9    27.6    -      -       +      -
    321A  ARG*     3.5    30.1    +      -       +      +
    324A  LEU*     3.7    26.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  TRP*     4.8     2.9    +      -       -      -
    105A  LEU*     3.8    30.0    -      -       +      +
    107A  TYR      5.0     5.0    -      -       -      +
    108A  LEU*     3.6    16.5    -      -       +      +
    109A  GLY      6.0     0.2    -      -       -      +
    159A  LEU      3.3     7.7    +      -       -      +
    160A  ARG*     3.1    40.1    +      -       -      +
    162A  LEU*     1.4    75.3    -      -       -      +
    164A  ILE*     1.4    63.3    +      -       -      +
    166A  GLU*     3.6     2.6    +      -       -      +
    167A  TYR*     3.1    23.9    +      -       -      +
    321A  ARG*     3.0    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  LEU*     4.1     7.2    -      -       +      -
    109A  GLY*     3.5    42.6    -      -       -      +
    110A  VAL*     4.0    15.7    -      -       +      +
    160A  ARG*     3.1    18.5    +      -       +      +
    161A  ILE*     3.1    19.8    +      -       +      +
    163A  ASP*     1.4    74.7    -      -       -      +
    165A  LEU*     1.4    59.9    +      -       +      +
    167A  TYR*     3.3     4.2    +      -       -      +
    168A  ILE*     3.0    31.6    +      -       +      +
    183A  LEU*     5.1     1.3    -      -       +      -
    193A  VAL*     4.1     8.7    -      -       +      +
    194A  TYR      4.6     0.7    -      -       -      -
    195A  LEU*     3.8    44.9    -      -       +      +
    198A  TYR*     4.2     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  ILE*     2.8    39.2    +      -       +      +
    162A  LEU*     4.0     4.3    -      -       +      +
    164A  ILE*     1.4    70.0    -      -       -      +
    166A  GLU*     1.3    65.7    +      -       -      +
    167A  TYR      3.4     0.2    +      -       -      -
    168A  ILE*     3.5    14.1    -      -       +      +
    169A  HIS*     2.9    40.9    +      -       +      -
    175A  HIS*     4.6     0.2    -      -       +      -
    178A  ILE*     3.9    18.8    -      -       +      -
    195A  LEU*     4.3    10.3    -      -       +      -
    243A  ASP*     3.6    45.1    -      -       +      +
    244A  LEU*     4.0    22.2    -      -       +      -
    247A  LEU*     4.5     6.5    -      -       +      -
    317A  TYR*     5.0     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  TRP*     4.2    10.1    -      -       +      -
    103A  ARG*     3.2    35.5    +      -       -      +
    162A  LEU      2.9    19.3    +      -       -      +
    163A  ASP      3.8     4.3    -      -       -      +
    165A  LEU*     1.3    74.2    -      -       -      +
    167A  TYR*     1.3    56.1    +      -       -      +
    169A  HIS*     3.5     1.2    +      -       -      +
    170A  GLU*     3.0    40.7    +      -       +      +
    314A  LYS*     5.8     1.6    -      -       -      -
    317A  TYR*     3.6    45.2    +      -       +      +
    321A  ARG*     2.6    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  ALA*     2.5    34.6    +      -       +      -
     95A  GLN*     3.5    22.3    -      -       -      +
     96A  ILE*     3.6    14.0    -      -       +      +
     99A  TRP*     3.3    52.2    -      +       +      -
    108A  LEU*     3.6    20.4    -      -       +      -
    110A  VAL*     3.7    27.8    -      -       +      -
    163A  ASP      3.1    15.0    +      -       -      +
    164A  ILE      3.5     7.2    -      -       -      +
    166A  GLU*     1.3    75.2    -      -       -      +
    168A  ILE*     1.3    65.2    +      -       +      +
    170A  GLU*     3.2     3.1    +      -       -      +
    171A  HIS*     2.6    57.8    +      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  PHE*     3.7    33.0    -      -       +      -
    110A  VAL*     4.2     9.9    -      -       +      -
    164A  ILE*     3.0    19.5    +      -       +      +
    165A  LEU*     3.5    19.1    -      -       +      +
    167A  TYR*     1.3    85.3    -      -       +      +
    169A  HIS*     1.4    60.5    +      -       +      +
    171A  HIS*     3.1    17.1    +      -       -      +
    173A  TYR*     2.9    35.3    +      -       +      +
    174A  VAL      4.0     1.6    -      -       -      -
    175A  HIS*     3.6    38.1    -      -       +      +
    195A  LEU*     5.0     2.9    -      -       +      -
    198A  TYR*     4.5    13.5    -      -       +      +
    243A  ASP*     4.1     6.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165A  LEU*     2.9    35.6    +      -       +      +
    166A  GLU      3.8     1.8    -      -       -      +
    168A  ILE*     1.4    77.5    -      -       +      +
    170A  GLU*     1.4    62.6    +      -       -      +
    172A  GLU*     3.2    10.2    +      -       -      -
    173A  TYR      3.2    20.4    +      -       -      -
    174A  VAL*     3.7     9.6    -      -       +      +
    204A  TYR*     2.6    23.1    +      -       -      -
    205A  CYS*     5.0     0.5    -      -       -      -
    240A  ARG*     3.4    40.4    -      -       +      +
    243A  ASP*     2.7    33.4    +      -       +      +
    244A  LEU*     4.9     3.1    -      -       +      -
    317A  TYR*     2.7    35.5    +      +       +      +
----------------------------------------------------------
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Residues in contact with GLU 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  TRP*     3.9    25.8    -      -       +      -
    103A  ARG*     4.7     5.2    -      -       -      +
    166A  GLU*     3.0    28.8    +      -       +      +
    167A  TYR      3.2     5.8    +      -       -      +
    169A  HIS*     1.4    74.6    -      -       -      +
    171A  HIS*     1.4    62.3    +      -       +      +
    172A  GLU*     3.4     5.3    +      -       -      +
    240A  ARG*     4.4     9.5    +      -       -      -
    314A  LYS*     3.4    36.7    +      -       -      +
    317A  TYR*     4.6     6.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89A  ARG*     4.8     1.9    -      -       -      +
     90A  ALA*     3.7    23.1    -      -       +      +
     95A  GLN*     3.6    30.7    +      -       -      +
     99A  TRP*     4.0    18.8    -      +       -      -
    167A  TYR*     2.6    61.6    +      +       -      +
    168A  ILE*     3.1    12.7    +      -       -      +
    170A  GLU*     1.4    79.8    -      -       +      +
    172A  GLU*     1.4    64.3    +      -       -      +
    173A  TYR*     3.3    19.8    -      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il