Contacts of the helix formed by residues 159 - 180 (chain A) in PDB entry 1H9T


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 PRO 159 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154A  PHE*     4.1    20.2    -      -       +      +
    157A  GLY      3.0    13.0    -      -       -      +
    158A  ASN*     1.3    84.0    -      -       -      +
    160A  ILE*     1.3    59.6    +      -       +      +
    161A  TYR      3.1     0.2    -      -       -      -
    162A  GLY*     2.6    23.9    +      -       -      +
    163A  LEU*     2.9    15.5    +      -       +      +
     75B  TRP*     3.5    33.2    -      -       +      -
     96B  GLN*     6.0     1.8    -      -       -      +
     97B  LEU*     5.4     7.0    -      -       +      -
    100B  ASN*     4.1    17.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  ASN*     3.1    13.6    +      -       -      +
    159A  PRO*     1.3    80.6    -      -       +      +
    161A  TYR*     1.3    63.9    +      -       -      +
    162A  GLY      2.9     1.2    +      -       -      -
    163A  LEU*     3.1    10.0    +      -       -      +
    164A  ILE*     3.0    24.7    +      -       +      +
     80B  LEU*     3.9    17.7    -      -       +      -
     83B  LEU*     4.0    23.1    -      -       +      -
     97B  LEU*     4.5     5.8    -      -       +      +
    100B  ASN*     3.8     5.2    -      -       +      -
    101B  LEU*     3.1    50.9    -      -       +      +
    104B  VAL*     4.0    24.2    -      -       +      -
    168B  MET*     5.0     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  ILE*     4.1    26.0    -      -       +      -
    111A  ILE*     3.2    30.0    -      -       +      +
    112A  PHE*     3.7    31.3    -      +       +      -
    115A  THR*     6.2     1.8    -      -       +      -
    153A  ALA*     3.6    21.9    -      -       +      +
    156A  SER*     4.2     2.7    -      -       -      -
    158A  ASN*     3.1    31.8    +      -       +      +
    160A  ILE*     1.3    76.8    -      -       -      +
    162A  GLY*     1.3    61.6    +      -       -      +
    164A  ILE*     3.7    11.3    -      -       +      +
    165A  LEU*     3.3    20.3    +      -       -      +
    103B  SER      4.6     1.8    -      -       -      -
    104B  VAL*     3.4    37.3    +      -       +      +
    107B  ASN*     3.5    18.7    +      -       -      +
    108B  ILE*     4.6     7.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  ARG*     5.4     0.2    -      -       -      -
    153A  ALA*     3.9     9.2    -      -       -      +
    154A  PHE*     3.5    29.6    -      -       -      +
    158A  ASN      4.1     0.6    +      -       -      -
    159A  PRO*     2.6    12.5    +      -       -      +
    161A  TYR*     1.3    76.0    -      -       -      +
    163A  LEU*     1.3    53.6    +      -       -      -
    164A  ILE      2.3    17.9    +      -       -      -
    165A  LEU*     2.9     4.8    +      -       -      +
    166A  ASN*     2.8    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  LEU*     5.7     0.2    -      -       -      +
    154A  PHE*     4.2     0.6    -      -       +      -
    159A  PRO      2.9    15.5    +      -       -      +
    160A  ILE*     3.1     8.5    +      -       +      +
    162A  GLY*     1.3    72.8    -      -       -      +
    164A  ILE*     1.3    59.9    +      -       -      +
    166A  ASN*     3.3    22.3    -      -       -      +
    167A  GLY*     3.3     6.2    +      -       -      -
     74B  PHE      4.8     3.4    -      -       -      +
     75B  TRP*     3.9    33.4    -      -       +      +
     78B  SER      3.8    13.7    -      -       -      +
     79B  GLY*     3.4    25.6    -      -       -      +
     80B  LEU*     4.0     8.0    +      -       +      +
     82B  ILE*     4.0    34.1    -      -       +      -
     83B  LEU*     4.1    26.0    -      -       +      -
     86B  LEU*     5.0     4.7    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     80A  LEU*     3.7    15.5    -      -       +      +
    108A  ILE*     5.1     6.5    -      -       +      -
    160A  ILE*     3.0    22.6    +      -       +      +
    161A  TYR*     3.7    15.7    -      -       +      +
    162A  GLY      2.3    13.3    +      -       -      -
    163A  LEU*     1.3    66.6    -      -       -      +
    165A  LEU*     1.3    71.7    +      -       +      +
    166A  ASN      3.0     0.9    -      -       -      -
    167A  GLY*     2.7    14.4    +      -       -      -
    168A  MET*     3.0    34.8    +      -       +      +
     80B  LEU*     3.5    21.5    -      -       +      -
    104B  VAL*     5.2     1.8    -      -       +      -
    108B  ILE*     4.3    14.1    -      -       +      -
    164B  ILE*     3.5    36.6    -      -       +      -
    168B  MET*     5.5     0.2    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    105A  ARG*     4.9    12.8    -      -       +      -
    108A  ILE*     5.6     4.3    -      -       +      -
    112A  PHE*     4.9    13.0    -      -       +      -
    146A  TYR*     3.5    32.5    -      -       +      -
    149A  PHE*     4.2    21.8    -      -       +      -
    150A  ARG*     4.3    21.8    -      -       +      +
    153A  ALA*     5.0     2.2    -      -       +      -
    161A  TYR      3.3    12.5    +      -       -      +
    162A  GLY*     2.9     8.1    +      -       -      +
    164A  ILE*     1.3    77.5    -      -       +      +
    166A  ASN*     1.3    65.8    +      -       -      +
    168A  MET*     2.7    46.8    +      -       +      +
    169A  LYS      2.9    12.5    +      -       -      -
    172A  TYR*     5.0     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146A  TYR*     3.5     8.8    +      -       -      -
    150A  ARG*     3.2    19.9    +      -       -      +
    162A  GLY      2.8    17.2    +      -       -      +
    163A  LEU*     3.3    14.2    -      -       -      +
    165A  LEU*     1.3    78.4    -      -       -      +
    167A  GLY*     1.3    63.6    +      -       -      +
    169A  LYS*     3.4    17.5    +      -       -      +
     74B  PHE      3.7     0.8    +      -       -      -
     75B  TRP      2.9    25.0    +      -       -      -
     76B  GLU      2.7    33.6    -      -       -      +
     77B  THR*     4.7     0.2    -      -       -      -
     78B  SER      2.6    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  LEU*     4.1    29.5    -      -       -      +
     81A  ASN*     4.8     8.8    +      -       -      -
     83A  LEU*     4.8     0.9    -      -       -      +
    163A  LEU      3.3     6.5    +      -       -      -
    164A  ILE      2.7    13.7    +      -       -      -
    166A  ASN*     1.3    77.1    -      -       -      +
    168A  MET*     1.3    61.8    +      -       -      +
    170A  GLY*     4.4     2.9    +      -       -      -
     78B  SER      4.7     1.0    +      -       -      -
     79B  GLY*     5.1     7.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  LEU*     4.0    12.6    -      -       +      -
     83A  LEU*     4.9     9.7    -      -       +      +
    101A  LEU*     3.7    25.8    -      -       +      -
    104A  VAL*     4.0    24.2    -      -       +      -
    105A  ARG*     3.9    22.2    -      -       +      -
    108A  ILE*     4.6     3.6    -      -       +      -
    164A  ILE*     3.4    35.2    -      -       +      +
    165A  LEU*     2.7    35.1    +      -       +      +
    167A  GLY*     1.3    74.4    -      -       -      +
    169A  LYS*     1.3    69.3    +      -       -      +
    170A  GLY*     2.6     4.3    +      -       -      -
    171A  LEU*     3.3     7.4    +      -       -      +
    172A  TYR*     3.2    23.9    +      -       +      -
    160B  ILE*     5.9     0.2    -      -       +      -
    164B  ILE*     5.1     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143A  GLU*     4.3    23.8    +      -       -      -
    146A  TYR*     3.6    44.7    -      -       +      +
    165A  LEU      2.9     7.3    +      -       -      -
    166A  ASN      3.4    14.6    -      -       -      +
    168A  MET*     1.3    74.5    -      -       -      +
    170A  GLY*     1.3    57.9    +      -       -      +
    172A  TYR*     2.6    25.9    +      -       -      +
    173A  THR*     2.7    26.7    +      -       +      +
     76B  GLU*     5.2     9.6    +      -       -      +
     77B  THR*     6.2     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  GLU*     3.7    27.6    -      -       -      -
    167A  GLY      4.4     3.3    +      -       -      -
    168A  MET      2.6     5.8    +      -       -      -
    169A  LYS*     1.3    81.9    -      -       -      +
    171A  LEU*     1.3    59.6    +      -       -      -
    173A  THR*     3.3     4.6    +      -       -      -
    174A  ARG*     3.3    22.2    +      -       -      +
    177A  ARG*     4.5     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  LEU*     3.8    27.1    -      -       +      +
     84A  GLU*     3.4    23.1    -      -       +      +
     87A  ALA*     4.6    13.9    -      -       +      -
     94A  VAL*     5.9     0.2    -      -       +      -
     97A  LEU*     3.9    24.9    -      -       +      -
     98A  ILE*     3.9    28.3    -      -       +      -
    101A  LEU*     3.6    24.2    -      -       +      -
    168A  MET      3.3     4.3    +      -       -      +
    170A  GLY*     1.3    72.9    -      -       -      +
    172A  TYR*     1.3    58.3    +      -       -      +
    173A  THR      3.4     0.4    +      -       -      -
    174A  ARG*     4.0    14.4    -      -       +      -
    175A  ILE*     3.0    25.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  LEU*     4.3    14.0    -      -       +      +
    102A  LEU*     4.0    22.9    -      -       +      -
    105A  ARG*     3.3    50.5    +      -       +      -
    145A  ASP*     3.2    29.4    +      -       -      -
    146A  TYR*     3.7    34.5    -      +       +      -
    149A  PHE*     4.5     4.2    -      +       -      -
    165A  LEU*     5.0     7.0    -      -       +      -
    168A  MET*     3.2    25.7    +      -       +      +
    169A  LYS      2.6    18.0    +      -       -      +
    171A  LEU*     1.3    74.9    -      -       -      +
    173A  THR*     1.3    57.9    +      -       -      -
    175A  ILE*     4.0     4.7    +      -       +      +
    176A  GLY*     3.6    11.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  ALA*     4.7    10.3    -      -       -      +
    143A  GLU*     4.7     9.4    -      -       -      +
    146A  TYR*     4.1    23.1    -      -       +      -
    169A  LYS*     2.7    39.8    +      -       +      +
    170A  GLY*     3.6     5.9    +      -       -      -
    172A  TYR*     1.3    72.4    -      -       -      +
    174A  ARG*     1.3    66.6    +      -       -      +
    175A  ILE      2.9     2.0    -      -       -      -
    176A  GLY*     2.7    13.9    +      -       -      +
    177A  ARG*     2.7    48.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  GLU*     4.0    22.8    +      -       -      +
    170A  GLY      3.3    12.6    +      -       -      +
    171A  LEU*     4.3    17.5    -      -       +      +
    172A  TYR      3.5     0.2    -      -       -      -
    173A  THR*     1.3    81.6    +      -       -      +
    175A  ILE*     1.3    60.3    +      -       +      +
    177A  ARG*     3.3    23.2    +      -       -      +
    178A  HIS*     2.7    39.8    +      -       +      -
   1242A   CL      3.4    29.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  ILE*     3.3    54.1    -      -       +      -
    101A  LEU*     4.6     4.9    -      -       +      -
    102A  LEU*     4.0    24.5    -      -       +      -
    171A  LEU*     3.0    26.5    -      -       +      +
    172A  TYR*     4.1     7.6    -      -       +      +
    173A  THR      2.9     0.2    -      -       -      -
    174A  ARG*     1.3    76.7    -      -       +      +
    176A  GLY*     1.3    53.2    +      -       -      +
    178A  HIS*     2.7    10.9    +      -       -      +
    179A  TYR*     2.7    40.0    +      -       +      +
    223A  TRP*     4.3    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  ALA*     3.5    11.9    -      -       -      -
    172A  TYR      3.6     6.6    +      -       -      -
    173A  THR      2.7     9.4    +      -       -      -
    175A  ILE*     1.3    76.6    -      -       -      +
    177A  ARG*     1.3    54.6    +      -       -      -
    178A  HIS      2.4    17.1    +      -       -      -
    179A  TYR*     4.6     2.9    -      -       -      -
    180A  PHE*     3.2    42.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  ALA*     4.0    14.7    -      -       -      +
    139A  ASP*     3.3    45.7    +      -       -      +
    142A  ALA*     3.4    11.0    -      -       +      +
    143A  GLU*     5.5     5.1    +      -       -      +
    170A  GLY      4.5     0.4    +      -       -      -
    173A  THR*     2.7    51.6    +      -       -      +
    174A  ARG*     3.3    32.7    -      -       -      +
    176A  GLY*     1.3    69.1    -      -       -      -
    178A  HIS*     1.3    72.0    +      -       +      +
    181A  ALA*     4.4     3.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  ARG*     2.7    34.7    +      -       +      +
    175A  ILE*     2.7     7.7    +      -       -      +
    176A  GLY      2.4    14.5    +      -       -      -
    177A  ARG*     1.3    82.8    +      -       +      +
    179A  TYR*     1.3    69.5    +      -       -      +
    181A  ALA*     3.0    21.1    +      -       -      +
    223A  TRP*     4.1    18.6    -      +       +      -
    226A  MET*     4.2     4.4    -      -       -      +
   1242A   CL      4.5    12.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  LEU*     6.4     0.7    -      -       +      -
    175A  ILE*     2.7    21.6    +      -       +      +
    176A  GLY*     5.0     1.6    -      -       -      -
    178A  HIS*     1.3    74.6    -      -       -      +
    180A  PHE*     1.3   115.0    +      +       -      +
    181A  ALA      2.8     2.4    +      -       -      -
    182A  ASN*     3.1    11.6    +      -       -      +
    185A  ALA*     3.2    32.6    +      -       +      +
    188A  LEU*     5.1     0.2    -      -       -      +
    189A  ALA      5.1     0.2    +      -       -      -
    215A  TYR*     4.3     8.9    +      -       -      -
    219A  SER*     3.3    46.5    -      -       -      -
    222A  ILE*     3.9     9.1    -      -       +      +
    223A  TRP*     3.3    47.8    -      -       +      -
    226A  MET*     3.2    17.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  ALA*     3.9    13.2    -      -       +      -
    141A  PHE*     3.3    32.3    -      +       +      -
    142A  ALA*     3.4    38.6    -      -       +      -
    145A  ASP*     3.3    36.6    -      -       +      -
    172A  TYR*     6.5     0.2    -      +       -      -
    176A  GLY*     3.2    25.9    +      -       -      +
    179A  TYR*     1.3   104.4    -      +       -      +
    181A  ALA*     1.3    68.1    +      -       -      +
    182A  ASN*     2.7    10.9    +      -       -      +
    185A  ALA*     4.6     5.4    -      -       +      -
    186A  ARG*     3.5    17.1    +      -       +      +
    189A  ALA*     4.0    12.1    -      -       +      -
    215A  TYR*     5.0     1.1    -      -       -      -
----------------------------------------------------------
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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