Contacts of the helix formed by residues 184 - 205 (chain C) in PDB entry 3OX4


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 184 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274B  ASN*     5.3    11.4    -      -       +      +
     41C  PHE*     6.0     0.2    -      -       +      -
    182C  GLY      3.3     8.3    -      -       -      +
    183C  MET*     1.3    88.1    -      -       +      +
    185C  LYS*     1.3    67.0    +      -       -      +
    186C  GLY*     2.8     4.8    +      -       -      +
    187C  LEU*     2.9    32.0    +      -       +      +
    188C  THR*     3.1     6.8    +      -       -      +
   1385C  NAD      3.6    16.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 185 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273B  TYR      5.7     7.4    -      -       -      +
    275B  LEU*     6.1     4.3    -      -       +      -
    343B  LEU      5.5     7.4    -      -       -      +
    344B  GLY*     5.6     6.1    -      -       -      -
    183C  MET      3.7     1.0    +      -       -      -
    184C  PRO*     1.3    70.6    -      -       -      +
    186C  GLY*     1.3    59.3    +      -       -      +
    188C  THR*     2.7    23.8    +      -       -      -
    189C  ALA*     3.4    11.4    +      -       -      +
    230C  ALA      5.8     0.2    -      -       -      -
    231C  CYS*     3.1    33.0    -      -       +      +
    232C  ASP*     3.7    18.1    +      -       -      +
    333C  SER      4.7     2.4    +      -       -      -
    334C  ILE*     3.1    35.3    +      -       -      +
    335C  GLY*     5.0     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 186 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184C  PRO*     2.8     9.8    +      -       -      +
    185C  LYS*     1.3    77.5    -      -       -      +
    187C  LEU*     1.3    55.0    +      -       -      +
    189C  ALA*     3.8     3.7    -      -       -      +
    190C  ALA*     3.1    27.6    +      -       -      +
    279C  VAL*     5.5     0.5    -      -       -      +
    334C  ILE      5.8     1.3    -      -       -      -
    336C  ILE*     5.5     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 187 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139C  THR*     4.2     1.8    -      -       +      -
    183C  MET*     3.8    16.8    -      -       +      -
    184C  PRO*     2.9    21.8    +      -       +      +
    186C  GLY*     1.3    72.2    -      -       -      +
    188C  THR*     1.3    64.1    +      -       -      +
    190C  ALA*     4.4     6.5    -      -       +      -
    191C  THR*     2.9    52.0    +      -       +      +
   1385C  NAD      3.2    74.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 188 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140C  ALA*     4.8     1.6    -      -       -      +
    183C  MET*     3.2    24.9    -      -       +      +
    184C  PRO      3.1    15.0    +      -       -      +
    185C  LYS*     2.7    17.9    +      -       -      -
    187C  LEU*     1.3    76.9    -      -       -      +
    189C  ALA*     1.3    65.9    +      -       -      +
    191C  THR*     3.2     6.8    +      -       -      -
    192C  GLY*     2.8    27.7    +      -       -      -
    227C  LEU*     3.8     4.9    -      -       -      +
    230C  ALA*     4.4     9.2    -      -       -      +
    231C  CYS*     3.2    17.8    -      -       -      -
    234C  GLY*     5.6     0.2    -      -       -      -
    240C  ARG*     2.9    35.2    -      -       -      +
    243C  MET*     5.3     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 189 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185C  LYS      3.4    10.7    +      -       -      +
    186C  GLY*     3.8     3.8    -      -       -      +
    187C  LEU      3.3     0.2    -      -       -      -
    188C  THR*     1.3    80.1    +      -       -      +
    190C  ALA*     1.3    59.7    -      -       -      +
    192C  GLY      3.8     0.2    -      -       -      -
    193C  MET*     2.9    35.9    +      -       -      +
    227C  LEU*     4.2     2.2    -      -       -      -
    231C  CYS*     3.5    18.6    -      -       -      -
    334C  ILE*     3.5    37.0    -      -       +      +
    336C  ILE*     4.1     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 190 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186C  GLY      3.1    15.5    +      -       -      +
    187C  LEU*     3.4     8.7    +      -       +      +
    189C  ALA*     1.3    80.2    -      -       -      +
    191C  THR*     1.3    60.6    +      -       +      +
    193C  MET*     3.3     2.5    +      -       -      +
    194C  ASP*     3.0    26.3    +      -       -      +
    278C  GLY*     3.7    12.4    -      -       -      +
    279C  VAL*     3.5    35.9    -      -       +      +
    336C  ILE*     4.3    10.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 191 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139C  THR*     3.7    22.2    -      -       -      +
    140C  ALA*     3.2    23.7    +      -       -      +
    141C  GLY*     2.9    28.4    -      -       -      -
    142C  THR*     5.5     1.8    -      -       +      -
    183C  MET*     3.9     1.4    -      -       -      -
    187C  LEU*     2.9    40.7    +      -       +      +
    188C  THR*     3.2     8.0    +      -       -      -
    190C  ALA*     1.3    73.1    -      -       +      +
    192C  GLY*     1.3    61.9    +      -       -      +
    194C  ASP*     3.3     6.0    +      -       -      +
    195C  ALA      3.0    16.3    +      -       -      -
    278C  GLY*     5.2     2.5    -      -       -      -
   1385C  NAD      4.0    14.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 192 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140C  ALA      3.5     9.0    -      -       -      -
    188C  THR      2.8    20.1    +      -       -      -
    189C  ALA      3.8     0.2    -      -       -      -
    190C  ALA      3.3     0.2    -      -       -      -
    191C  THR*     1.3    78.7    +      -       -      +
    193C  MET*     1.3    55.9    +      -       -      +
    195C  ALA*     3.5     4.3    +      -       -      +
    196C  LEU*     3.2    23.4    +      -       -      +
    223C  ILE*     3.9     6.2    -      -       -      +
    227C  LEU*     3.8    13.5    -      -       -      +
    243C  MET*     3.7    17.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 193 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189C  ALA      2.9    20.8    +      -       -      +
    190C  ALA      3.7     0.7    -      -       -      +
    192C  GLY*     1.3    74.1    -      -       -      +
    194C  ASP*     1.3    60.9    +      -       -      +
    196C  LEU*     3.2    10.8    +      -       +      +
    197C  THR*     2.8    32.1    +      -       -      -
    227C  LEU*     4.0    16.2    -      -       +      -
    282C  ALA*     3.4    38.8    -      -       +      +
    285C  LEU*     4.4    10.5    -      -       +      +
    286C  PRO*     5.7     0.2    -      -       +      -
    327C  VAL*     4.3    21.5    -      -       +      +
    330C  LEU*     4.2    14.6    -      -       +      -
    331C  ALA*     3.6    24.9    -      -       +      -
    334C  ILE*     3.6    20.0    -      -       +      -
    336C  ILE*     4.1     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 194 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141C  GLY      3.5     7.8    -      -       -      +
    142C  THR*     4.0     5.7    -      -       -      +
    190C  ALA      3.0    13.7    +      -       -      +
    191C  THR*     3.3    11.4    +      -       -      +
    193C  MET*     1.3    78.8    -      -       -      +
    195C  ALA*     1.3    56.5    +      -       -      +
    197C  THR*     3.2     6.8    +      -       -      -
    198C  HIS*     2.9    39.5    +      -       -      -
    263C  HIS*     3.3     6.4    +      -       -      -
    277C  HIS*     4.7     1.9    +      -       -      -
    278C  GLY*     4.1    21.9    +      -       -      +
    281C  ASN*     3.3    10.5    -      -       -      +
    501C  FE2      2.1    31.4    -      -       -      -
   1385C  NAD      3.7     8.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 195 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140C  ALA      4.3     1.8    -      -       -      +
    141C  GLY*     3.6    20.8    +      -       -      +
    191C  THR      3.0    12.4    +      -       -      +
    192C  GLY*     3.6    10.1    -      -       -      +
    193C  MET      3.2     0.2    -      -       -      -
    194C  ASP*     1.3    78.0    -      -       -      +
    196C  LEU*     1.3    60.9    +      -       -      +
    198C  HIS*     3.0    11.1    +      -       -      +
    199C  ALA*     3.0    18.9    +      -       -      +
    223C  ILE*     3.9    13.7    -      -       +      -
    243C  MET*     5.4     1.1    -      -       +      -
    247C  GLN*     4.1    21.1    -      -       +      -
    250C  ALA*     3.4     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 196 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192C  GLY      3.2    11.3    +      -       -      +
    193C  MET*     3.2    25.8    +      -       +      +
    195C  ALA*     1.3    79.4    -      -       -      +
    197C  THR*     1.3    57.9    +      -       -      +
    199C  ALA*     3.1     4.0    +      -       -      +
    200C  PHE*     2.9    46.5    +      -       +      -
    220C  ALA*     4.0    29.8    -      -       +      -
    223C  ILE*     3.5    16.1    -      -       +      +
    285C  LEU*     4.6     5.2    -      -       +      -
    307C  MET*     3.9    33.0    -      -       +      -
    327C  VAL*     4.8     4.9    -      -       +      -
    330C  LEU*     4.0    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 197 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193C  MET      2.8    21.7    +      -       -      -
    194C  ASP*     3.3    11.7    -      -       -      -
    196C  LEU*     1.3    76.2    -      -       -      +
    198C  HIS*     1.3    56.4    +      -       -      +
    200C  PHE*     3.3     0.9    +      -       -      +
    201C  GLU*     2.9    34.0    +      -       +      +
    262C  VAL*     3.5    27.8    -      -       +      -
    263C  HIS*     3.2    27.6    -      -       +      +
    281C  ASN*     4.0     9.0    +      -       -      +
    282C  ALA      4.5     0.3    +      -       -      -
    285C  LEU*     3.6    31.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 198 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141C  GLY      3.1    27.6    +      -       -      -
    142C  THR*     3.6    11.8    +      -       -      -
    143C  ALA*     5.1     0.4    -      -       -      +
    194C  ASP*     2.9    26.1    +      -       -      -
    195C  ALA*     3.1     9.8    -      -       -      +
    197C  THR*     1.3    76.5    -      -       -      +
    199C  ALA*     1.3    58.0    +      -       -      +
    201C  GLU*     3.9     0.5    -      -       -      +
    202C  ALA*     2.9    35.0    +      -       -      +
    247C  GLN      5.4     0.2    +      -       -      -
    250C  ALA*     3.9     9.8    -      -       +      +
    254C  PHE*     3.1    41.3    -      +       +      +
    259C  LEU*     4.0    14.8    -      -       +      -
    263C  HIS*     3.3    13.0    +      +       -      -
    501C  FE2      2.3    29.4    -      -       -      -
   1385C  NAD      3.6     6.3    -      +       -      -
----------------------------------------------------------
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Residues in contact with ALA 199 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195C  ALA      3.0    11.3    +      -       -      +
    196C  LEU*     3.1    10.7    +      -       +      +
    198C  HIS*     1.3    76.2    -      -       -      +
    200C  PHE*     1.3    62.8    +      -       -      +
    202C  ALA*     4.6     0.4    -      -       -      -
    203C  TYR*     3.0    26.7    +      -       -      +
    216C  ALA*     3.4    35.7    -      -       -      +
    219C  ALA*     4.1    14.4    -      -       +      -
    220C  ALA*     4.2    14.4    -      -       +      +
    250C  ALA*     4.1     4.2    -      -       -      +
    303C  VAL*     5.9     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 200 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196C  LEU*     2.9    38.5    +      -       +      +
    197C  THR      3.3     4.5    +      -       -      +
    199C  ALA*     1.3    77.4    -      -       -      +
    201C  GLU*     1.3    57.9    -      -       +      +
    203C  TYR*     3.4     4.8    +      -       -      +
    204C  SER*     3.0    32.7    +      -       -      -
    285C  LEU*     4.4    10.5    -      -       +      -
    289C  LEU*     3.4    38.8    -      -       +      -
    300C  LEU*     4.2    14.1    -      -       +      -
    303C  VAL*     3.3    42.3    -      -       +      +
    307C  MET*     3.9    11.0    -      -       -      -
    323C  THR*     3.6    24.7    -      -       +      -
    327C  VAL*     3.8    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 201 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197C  THR*     2.9    28.5    +      -       +      +
    200C  PHE*     1.3    72.3    -      -       +      +
    202C  ALA*     1.3    61.3    +      -       -      +
    204C  SER*     3.7     5.0    -      -       -      +
    205C  SER*     2.8    30.7    +      -       -      -
    258C  SER      4.1     2.7    -      -       -      +
    259C  LEU*     3.4    13.7    -      -       +      +
    260C  GLY*     2.8    34.8    +      -       -      +
    261C  TYR      3.1     1.0    +      -       -      -
    262C  VAL*     2.8    42.5    +      -       +      +
    263C  HIS*     2.7    32.3    +      -       -      -
    285C  LEU*     5.4     0.4    -      -       +      -
    288C  VAL*     4.9     0.9    -      -       -      +
    289C  LEU*     6.3     0.9    -      -       +      -
    292C  ASN*     5.6     0.9    +      -       -      -
    366C  ASN*     4.6     1.0    -      -       -      +
    367C  PRO*     5.9     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 202 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198C  HIS      2.9    19.7    +      -       -      +
    199C  ALA      3.8     2.9    -      -       -      +
    201C  GLU*     1.3    76.4    -      -       -      +
    203C  TYR*     1.3    62.2    +      -       -      +
    205C  SER*     3.4    14.4    +      -       -      -
    208C  ALA*     3.7     7.6    -      -       -      +
    212C  THR*     4.7     2.5    +      -       -      -
    213C  ASP*     4.9     0.2    -      -       -      +
    216C  ALA*     4.4     1.6    -      -       +      -
    253C  ALA*     3.5    35.2    -      -       +      +
    254C  PHE*     3.7    14.1    -      -       -      +
    257C  ALA*     3.7    11.8    -      -       +      +
    258C  SER      3.7    10.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 203 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199C  ALA      3.0    17.3    +      -       -      +
    200C  PHE      3.7     4.3    -      -       -      +
    202C  ALA*     1.3    79.2    -      -       -      +
    204C  SER*     1.3    58.9    +      -       -      +
    208C  ALA*     4.2     2.3    -      -       -      +
    213C  ASP*     3.6    40.1    +      -       +      +
    216C  ALA*     4.2     5.6    -      -       +      +
    217C  LEU*     3.2    41.6    -      -       +      +
    299C  ARG*     2.8    87.0    +      -       +      -
    302C  ASP*     3.3    25.8    +      -       +      +
    303C  VAL*     3.5    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 204 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200C  PHE      3.0    17.6    +      -       -      -
    201C  GLU*     4.0     6.1    -      -       -      -
    202C  ALA      3.3     0.2    -      -       -      -
    203C  TYR*     1.3    76.9    -      -       -      +
    205C  SER*     1.3    67.1    +      -       -      +
    206C  THR*     3.5     0.9    +      -       -      +
    289C  LEU*     5.2     2.4    -      -       -      +
    292C  ASN*     5.1     4.3    +      -       -      -
    296C  VAL*     4.1    10.6    -      -       -      +
    299C  ARG*     4.5    11.2    +      -       -      +
    300C  LEU*     3.8    23.4    -      -       -      +
    303C  VAL*     6.1     0.2    -      -       -      +
    367C  PRO*     3.5    40.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 205 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201C  GLU      2.8    18.1    +      -       -      -
    202C  ALA      3.5    10.3    -      -       -      -
    203C  TYR      3.4     1.5    -      -       -      +
    204C  SER*     1.3    81.3    -      -       -      +
    206C  THR*     1.3    60.0    +      -       -      +
    207C  ALA      3.0    15.3    +      -       -      -
    208C  ALA*     3.3    16.3    +      -       -      +
    257C  ALA*     2.5    33.1    +      -       -      -
    258C  SER      4.2     0.4    -      -       -      -
    259C  LEU      4.1     7.2    -      -       -      -
    299C  ARG*     5.2     1.6    +      -       -      -
    365C  THR*     3.2    19.3    -      -       -      -
    367C  PRO*     4.9     0.7    -      -       -      -
----------------------------------------------------------
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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