Contacts of the helix formed by residues 206 - 229 (chain C) in PDB entry 3AP3


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 206 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200B  ALA*     4.4    21.2    -      -       -      +
    193C  ILE*     4.0    11.0    -      -       -      +
    207C  TYR*     1.3    60.3    +      -       -      +
    208C  ARG*     3.3    11.3    +      -       -      +
    209C  ASP*     2.8    34.5    +      -       -      +
    210C  CYS*     2.9    35.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 207 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186C  ARG      5.6     0.2    -      -       -      -
    189C  VAL*     3.8    13.7    -      -       +      -
    190C  HIS*     3.3    40.3    +      -       +      -
    193C  ILE*     3.4    37.4    -      -       +      +
    194C  THR*     4.2     3.6    -      -       -      +
    206C  SER*     1.3    69.4    +      -       -      +
    208C  ARG*     1.3    60.4    +      -       -      +
    210C  CYS*     3.0     1.8    +      -       -      -
    211C  LEU*     2.8    45.7    +      -       +      +
    304C  HIS*     4.4    14.3    +      -       -      +
    305C  ILE*     3.6    31.9    -      -       +      -
    306C  PRO*     4.2    21.5    -      -       +      -
    309C  VAL*     4.3    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 208 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206C  SER*     3.5     7.6    -      -       -      +
    207C  TYR*     1.3    79.5    -      -       -      +
    209C  ASP*     1.3    55.0    +      -       +      +
    212C  THR*     2.7    35.6    +      -       -      +
    308C  ASP*     3.1    33.5    +      -       -      -
    309C  VAL*     3.8    15.9    -      -       +      +
    311C  ARG*     4.2     1.8    -      -       -      +
    312C  ASP*     2.8    31.5    +      -       -      +
    316C  ILE*     3.7    35.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 209 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199B  ILE      5.5     0.2    -      -       -      +
    200B  ALA*     4.9     2.3    -      -       -      -
    201B  GLY*     3.6    38.3    +      -       -      +
    202B  PHE      5.7     0.7    -      -       -      +
    213B  LYS*     5.1     3.1    +      -       -      -
    206C  SER*     2.8    31.5    +      -       -      +
    208C  ARG*     1.3    74.1    -      -       +      +
    210C  CYS*     1.3    72.7    +      -       -      +
    212C  THR*     3.4     7.1    +      -       -      -
    213C  LYS*     3.1    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 210 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200B  ALA*     6.1     4.9    -      -       -      -
    189C  VAL*     3.2    35.2    -      -       +      +
    192C  MET*     4.5    17.6    -      -       -      +
    193C  ILE*     3.8    19.3    -      -       -      -
    206C  SER      2.9    30.0    +      -       -      +
    207C  TYR      3.0     0.6    +      -       -      +
    209C  ASP*     1.3    81.0    +      -       -      +
    211C  LEU*     1.3    56.8    +      -       -      +
    213C  LYS*     3.5     6.6    -      -       -      +
    214C  TRP*     3.0    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 211 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185C  GLY*     3.8    23.6    -      -       -      +
    186C  ARG*     4.0    14.6    -      -       +      +
    189C  VAL*     3.7    27.4    -      -       +      -
    207C  TYR*     2.8    32.0    +      -       +      +
    210C  CYS*     1.3    70.6    -      -       -      +
    212C  THR*     1.3    55.9    +      -       -      +
    213C  LYS      2.9     1.3    -      -       -      -
    214C  TRP*     3.1    10.5    +      -       +      +
    215C  ASN*     2.7    37.2    +      -       -      +
    305C  ILE*     5.6     1.6    -      -       +      -
    309C  VAL*     3.9    25.6    -      -       +      -
    313C  MET*     4.8    11.0    -      -       +      -
    316C  ILE*     3.5    18.6    -      -       +      -
    317C  ALA*     5.0     8.9    -      -       +      +
    320C  LEU*     5.3     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 212 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208C  ARG*     2.7    26.9    +      -       -      +
    209C  ASP*     3.7     6.1    -      -       -      -
    211C  LEU*     1.3    74.8    -      -       -      +
    213C  LYS*     1.3    58.2    +      -       +      +
    215C  ASN*     3.1     5.2    -      -       +      +
    216C  LYS*     3.0    30.7    +      -       +      +
    316C  ILE*     3.6    25.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 213 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201B  GLY      5.7     0.6    +      -       -      -
    202B  PHE      4.1     7.9    +      -       -      +
    203B  ASP*     3.2    44.3    +      -       -      +
    204B  LEU      5.5     1.1    -      -       -      +
    209B  ASP*     5.4     0.4    +      -       -      -
    209C  ASP*     3.1    25.5    +      -       -      +
    210C  CYS*     3.5     9.0    -      -       -      +
    211C  LEU      2.9     0.4    -      -       -      -
    212C  THR*     1.3    78.3    -      -       +      +
    214C  TRP*     1.3    67.0    +      -       -      +
    215C  ASN      3.1     0.7    -      -       -      -
    216C  LYS*     3.3     9.5    +      -       -      +
    217C  ALA*     2.9    26.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 214 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  VAL*     3.6    37.2    -      -       +      +
     79C  SER*     5.0     1.2    +      -       -      -
    183C  ARG      3.7    12.9    +      -       -      -
    184C  ASP*     5.0     0.2    -      -       -      -
    185C  GLY*     3.1    37.2    -      -       -      -
    188C  SER*     4.2    11.1    +      -       -      -
    189C  VAL*     4.0     9.6    -      -       +      -
    192C  MET*     5.4     2.0    -      -       +      -
    210C  CYS      3.0    19.7    +      -       -      +
    211C  LEU*     3.5     9.9    -      -       +      +
    213C  LYS*     1.3    74.0    -      -       -      +
    215C  ASN*     1.3    87.2    +      -       +      +
    217C  ALA*     3.6     5.1    -      -       -      +
    218C  ILE*     2.9    54.9    +      -       +      +
    317C  ALA*     4.0     8.7    -      -       +      -
    319C  MET*     4.0    10.8    -      -       +      -
    320C  LEU*     3.6    35.4    -      -       +      -
    323C  LEU*     3.9    19.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 215 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211C  LEU      2.7    16.4    +      -       -      +
    212C  THR*     3.1    13.7    -      -       -      +
    214C  TRP*     1.3    85.8    -      -       +      +
    216C  LYS*     1.3    64.0    +      -       -      +
    218C  ILE*     3.5     3.1    -      -       -      +
    219C  GLU*     2.9    40.2    +      -       -      +
    316C  ILE      3.6    15.5    -      -       -      +
    317C  ALA*     3.4     4.8    -      -       -      +
    318C  PRO*     3.3    18.7    -      -       -      +
    319C  MET*     3.1    43.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 216 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212C  THR*     3.0    12.9    +      -       +      +
    213C  LYS*     4.0     9.0    -      -       -      +
    215C  ASN*     1.3    84.5    +      -       -      +
    217C  ALA*     1.3    63.6    +      -       -      +
    219C  GLU*     3.2    37.0    +      -       -      +
    220C  VAL*     3.0    50.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 217 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  VAL*     3.9    16.4    -      -       +      -
    161C  PHE*     4.9    15.7    -      -       +      -
    164C  LYS*     5.0     8.5    -      -       -      +
    213C  LYS      2.9    18.7    +      -       -      +
    214C  TRP*     3.6     4.3    -      -       -      +
    216C  LYS*     1.3    78.1    -      -       -      +
    218C  ILE*     1.3    57.3    +      -       -      +
    220C  VAL*     3.3     6.7    +      -       -      +
    221C  MET*     3.1    34.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 218 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  VAL*     4.0    20.4    -      -       +      +
    180C  LEU*     4.7    15.7    -      -       +      -
    181C  MET      5.2     3.1    -      -       -      +
    182C  VAL*     4.1    23.6    -      -       +      -
    183C  ARG      6.0     0.4    -      -       -      +
    214C  TRP*     2.9    51.6    +      -       +      +
    215C  ASN      3.5     9.6    -      -       -      +
    217C  ALA*     1.3    71.2    -      -       -      +
    219C  GLU*     1.3    61.9    +      -       -      +
    221C  MET*     4.2     7.6    -      -       -      -
    222C  TYR*     3.0    30.1    +      -       +      +
    319C  MET*     4.2     7.6    -      -       +      -
    323C  LEU*     4.1    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 219 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215C  ASN*     2.9    27.8    +      -       -      +
    216C  LYS*     3.2    45.3    +      -       -      +
    218C  ILE*     1.3    73.7    -      -       -      +
    220C  VAL*     1.3    67.7    +      -       -      +
    222C  TYR*     4.0     1.9    -      -       -      +
    223C  ALA*     3.3    19.2    +      -       -      +
    319C  MET*     3.8    31.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 220 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164C  LYS*     4.0    39.5    -      -       -      +
    216C  LYS*     3.0    43.2    +      -       +      +
    217C  ALA*     3.5     7.4    -      -       -      +
    219C  GLU*     1.3    77.1    -      -       -      +
    221C  MET*     1.3    60.8    +      -       -      +
    222C  TYR      3.0     0.4    -      -       -      -
    223C  ALA*     2.9    25.0    +      -       -      +
    224C  GLN*     3.1    16.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 221 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75C  GLY*     3.6    39.3    -      -       -      +
     76C  VAL*     3.7    15.9    -      -       +      +
    160C  PRO      4.0    11.2    -      -       -      +
    161C  PHE*     3.9    21.5    -      -       +      -
    163C  LEU*     4.1    19.3    -      -       -      +
    164C  LYS*     3.8    33.4    -      -       +      +
    166C  SER*     5.0     0.2    +      -       -      -
    180C  LEU*     3.3    29.1    -      -       +      +
    217C  ALA      3.1    20.8    +      -       -      +
    218C  ILE*     3.4     8.0    +      -       -      +
    220C  VAL*     1.3    75.6    -      -       -      +
    222C  TYR*     1.3    57.4    +      -       -      +
    224C  GLN*     3.9     4.4    -      -       -      +
    225C  CYS*     3.3    18.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 222 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180C  LEU*     4.1    15.7    -      -       +      +
    182C  VAL*     5.5     1.3    -      -       +      -
    218C  ILE*     3.0    19.4    +      -       +      +
    219C  GLU      4.0     3.4    -      -       -      +
    221C  MET*     1.3    75.4    -      -       -      +
    223C  ALA*     1.3    56.7    +      -       -      +
    224C  GLN      3.2     1.3    -      -       -      -
    225C  CYS*     3.1     1.7    +      -       +      +
    226C  MET*     2.7    82.9    +      -       +      +
    235C  PRO*     4.0    20.4    -      -       +      +
    237C  TYR*     5.5     4.0    +      -       -      -
    319C  MET*     4.5    16.2    -      -       +      -
    323C  LEU*     4.3    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 223 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219C  GLU      3.3    11.5    +      -       -      +
    220C  VAL*     2.9    12.1    +      -       -      +
    222C  TYR*     1.3    77.3    -      -       -      +
    224C  GLN*     1.3    53.2    +      -       +      +
    226C  MET*     3.3     7.4    +      -       -      +
    227C  GLU*     2.8    37.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 224 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163C  LEU      4.3     2.5    -      -       -      +
    164C  LYS      3.0    21.5    +      -       -      +
    165C  SER*     3.3     2.8    -      -       -      -
    166C  SER*     3.0    24.8    +      -       -      +
    167C  VAL*     2.7    55.0    +      -       +      +
    220C  VAL*     3.1    19.4    +      -       +      +
    221C  MET      3.9     7.2    -      -       -      +
    223C  ALA*     1.3    73.3    -      -       +      +
    225C  CYS*     1.3    56.5    +      -       -      +
    226C  MET      3.0     1.3    -      -       -      -
    227C  GLU*     3.0     8.2    +      -       -      +
    228C  VAL*     2.8    39.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 225 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163C  LEU*     5.7     0.9    -      -       +      -
    166C  SER*     4.3     2.6    +      -       -      +
    180C  LEU*     3.9    12.6    -      -       +      -
    221C  MET      3.3    16.8    +      -       -      +
    222C  TYR*     3.1     5.7    +      -       -      +
    224C  GLN*     1.3    78.7    -      -       -      +
    226C  MET*     1.3    76.3    +      -       +      +
    228C  VAL*     4.0     2.0    -      -       -      -
    229C  GLY      3.8    12.8    +      -       -      +
    233C  CYS*     2.0    70.9    -      -       -      +
    234C  LEU      4.1     0.9    -      -       -      -
    235C  PRO*     4.2    11.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 226 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222C  TYR*     2.7    73.5    +      -       +      +
    223C  ALA*     3.6     7.2    -      -       -      +
    225C  CYS*     1.3    90.8    -      -       -      +
    227C  GLU*     1.3    65.4    +      -       -      +
    228C  VAL      3.3     0.2    -      -       -      -
    229C  GLY*     3.5    11.0    +      -       -      -
    230C  LYS*     6.1     9.2    -      -       +      +
    233C  CYS      4.9     2.0    -      -       -      +
    235C  PRO*     4.2    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 227 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167C  VAL*     3.8    30.0    -      -       +      +
    171C  ARG*     4.8     6.1    +      -       -      -
    223C  ALA      2.8    22.7    +      -       -      +
    224C  GLN*     3.0     7.9    +      -       -      +
    226C  MET*     1.3    74.8    -      -       -      +
    228C  VAL*     1.3    63.5    +      -       -      +
    229C  GLY*     3.2     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 228 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166C  SER*     4.3    12.3    -      -       -      +
    167C  VAL*     4.1    29.6    -      -       +      +
    170C  SER*     4.7     7.4    -      -       -      -
    178C  PHE*     4.8     4.3    -      -       +      -
    224C  GLN      2.8    24.0    +      -       -      +
    225C  CYS*     3.9     5.8    -      -       -      +
    226C  MET      3.3     0.2    -      -       -      -
    227C  GLU*     1.3    73.8    -      -       -      +
    229C  GLY*     1.3    56.6    +      -       -      +
    231C  GLU*     6.0     0.2    -      -       -      +
    232C  LYS*     3.0    49.5    -      -       +      +
    233C  CYS*     3.7    17.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 229 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225C  CYS      3.8     6.7    +      -       -      -
    226C  MET      3.5    10.7    +      -       -      -
    227C  GLU      3.2     5.6    +      -       -      -
    228C  VAL*     1.3    78.6    -      -       -      +
    230C  LYS*     1.3    55.4    +      -       -      -
    231C  GLU*     2.8    18.0    +      -       -      -
    232C  LYS      2.9    14.0    +      -       -      -
    233C  CYS*     3.0    12.5    +      -       -      +
----------------------------------------------------------
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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