Contacts of the helix formed by residues 151 - 173 (chain C) in PDB entry 3NDR


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 MSE 151 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171B  GLU*     4.5     0.4    +      -       -      -
     92C  VAL*     4.0    14.1    -      -       +      -
     93C  PRO*     3.8    23.1    -      -       +      +
     95C  VAL*     3.7     3.6    +      -       -      +
    100C  VAL*     6.1     0.2    -      -       -      -
    104C  HIS*     6.1     1.6    -      -       -      -
    143C  THR*     4.2    11.0    -      -       +      -
    148C  THR*     4.0    22.7    -      -       +      +
    149C  PRO      3.1     9.7    -      -       -      +
    150C  ASN*     1.3    80.0    -      -       -      +
    152C  ALA*     1.3    60.8    +      -       -      +
    153C  ALA      3.5     2.5    -      -       -      -
    154C  TYR*     3.2    49.4    +      -       +      -
    155C  VAL*     2.9    41.2    +      -       +      +
    197C  HIS*     3.6    21.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 152 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164B  PHE*     4.5    13.1    -      -       +      -
    167B  ALA*     4.1    24.2    -      -       +      +
    168B  LEU*     5.5     0.7    -      -       +      +
    171B  GLU*     5.0    10.1    +      -       +      +
     97C  TRP*     4.1    31.9    -      -       +      -
    100C  VAL*     4.8     8.6    -      -       +      +
    105C  TRP*     4.4     3.3    -      -       +      -
    150C  ASN      5.0     0.2    -      -       -      +
    151C  MSE      1.3    72.3    -      -       -      +
    153C  ALA*     1.3    67.5    +      -       -      +
    155C  VAL*     3.3     1.7    +      -       -      +
    156C  ALA*     3.0    23.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 153 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100C  VAL*     4.9     4.7    -      -       +      +
    104C  HIS*     3.9    29.3    +      -       +      +
    105C  TRP*     3.7    35.8    -      -       +      +
    108C  ILE*     3.7    18.1    -      -       +      +
    109C  ILE*     3.8     3.1    -      -       +      +
    151C  MSE      3.5     0.6    -      -       -      -
    152C  ALA*     1.3    77.4    -      -       -      +
    154C  TYR*     1.3    58.2    +      -       -      +
    156C  ALA*     3.4     3.5    +      -       -      +
    157C  ALA*     2.9    29.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 154 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  ILE      3.3    27.1    -      -       -      -
     92C  VAL*     4.1    11.8    -      -       +      +
     93C  PRO*     3.4    23.7    -      -       +      +
    108C  ILE*     3.6     9.5    -      -       +      +
    112C  ASN*     3.4     9.9    -      -       -      -
    141C  SER*     3.5    22.0    +      -       -      -
    143C  THR*     3.7    11.9    -      -       +      -
    151C  MSE      3.2    34.9    +      -       +      +
    153C  ALA*     1.3    79.5    -      -       -      +
    155C  VAL*     1.3    59.5    +      -       -      +
    157C  ALA*     3.3     2.6    +      -       -      +
    158C  LYS*     2.9    48.8    +      -       +      +
    251C  NAD      2.8    52.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 155 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163B  GLY*     3.5    24.8    -      -       -      +
    166B  ARG*     5.4     0.2    -      -       +      -
    167B  ALA*     3.9    13.5    -      -       +      +
    143C  THR*     3.5    44.2    -      -       -      +
    144C  PHE*     3.8    13.2    -      -       -      +
    147C  GLY*     4.9     0.7    -      -       -      -
    148C  THR      3.8    20.4    -      -       -      +
    151C  MSE      2.9    22.9    +      -       +      +
    152C  ALA      3.3     4.2    +      -       -      +
    154C  TYR*     1.3    74.0    -      -       -      +
    156C  ALA*     1.3    56.0    +      -       -      +
    158C  LYS*     3.9     2.8    -      -       -      +
    159C  GLY      2.9    22.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 156 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113B  LEU*     4.6     2.9    -      -       +      -
    160B  GLY*     3.3    33.2    -      -       -      +
    164B  PHE*     3.8    10.0    -      -       +      +
    105C  TRP*     3.6    28.3    -      -       +      -
    109C  ILE*     4.6     1.8    -      -       +      -
    152C  ALA      3.0    14.0    +      -       -      +
    153C  ALA      3.5     7.9    -      -       -      +
    155C  VAL*     1.3    73.4    -      -       -      +
    157C  ALA*     1.3    54.7    +      -       -      +
    159C  GLY      2.9     3.1    +      -       -      -
    160C  GLY*     2.8    30.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 157 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108C  ILE*     4.4     4.7    -      -       +      +
    109C  ILE*     3.8    18.9    -      -       +      +
    112C  ASN*     3.9    27.1    -      -       +      -
    113C  LEU*     3.8    17.0    -      -       +      +
    153C  ALA      2.9    17.6    +      -       -      +
    154C  TYR      3.6     4.3    -      -       -      +
    156C  ALA*     1.3    75.2    -      -       -      +
    158C  LYS*     1.3    59.1    +      -       -      +
    160C  GLY*     2.8    16.1    +      -       -      -
    161C  VAL*     2.9    18.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 158 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  SER*     3.0    22.4    +      -       -      -
    112C  ASN*     4.3     9.5    +      -       +      +
    139C  ILE      3.1    19.6    +      -       -      +
    140C  ALA*     3.5    22.7    -      -       +      +
    141C  SER*     3.9    16.8    -      -       -      +
    143C  THR*     5.0     0.2    -      -       -      +
    144C  PHE*     4.7     7.2    -      -       +      -
    154C  TYR*     2.9    47.0    +      -       +      +
    155C  VAL*     4.0     5.6    -      -       -      +
    157C  ALA*     1.3    74.2    -      -       +      +
    159C  GLY*     1.3    66.2    +      -       -      +
    161C  VAL*     3.2    19.9    +      -       +      +
    162C  ILE*     3.2    21.6    +      -       -      +
    251C  NAD      3.0    30.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 159 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144B  PHE*     4.1     1.2    -      -       -      -
    159B  GLY*     3.6    17.0    -      -       -      -
    163B  GLY*     4.5     0.2    -      -       -      -
    144C  PHE*     3.3    33.7    -      -       -      -
    155C  VAL      2.9    12.2    +      -       -      -
    156C  ALA      2.9     4.9    +      -       -      -
    158C  LYS*     1.3    75.3    -      -       -      +
    160C  GLY*     1.3    62.2    +      -       -      +
    162C  ILE*     3.2     6.0    +      -       -      +
    163C  GLY      3.0    17.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 160 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156B  ALA*     3.2    24.5    -      -       -      +
    160B  GLY*     3.7     3.9    -      -       -      +
    113C  LEU*     3.6    16.8    -      -       -      -
    156C  ALA      2.8    12.9    +      -       -      -
    157C  ALA      2.8     6.4    +      -       -      -
    159C  GLY*     1.3    76.1    -      -       -      +
    161C  VAL*     1.3    51.8    +      -       -      +
    163C  GLY*     3.1     1.6    +      -       -      -
    164C  PHE*     2.7    35.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 161 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112C  ASN      3.5    25.1    -      -       -      +
    113C  LEU*     4.2     5.8    -      -       +      -
    116C  THR*     3.9    18.8    -      -       +      +
    138C  SER*     3.8    28.7    -      -       -      +
    139C  ILE      4.8     3.4    -      -       -      +
    140C  ALA*     4.5    18.2    -      -       +      -
    157C  ALA      2.9    13.8    +      -       -      +
    158C  LYS*     3.2    16.1    +      -       +      +
    160C  GLY*     1.3    75.0    -      -       -      +
    162C  ILE*     1.3    58.2    +      -       -      +
    164C  PHE*     3.6     9.7    -      -       +      +
    165C  THR*     2.7    33.3    +      -       -      +
    181C  ALA*     5.1     1.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 162 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144B  PHE*     4.3    13.9    -      -       +      -
    140C  ALA*     4.0    22.2    -      -       +      -
    144C  PHE*     3.6    38.1    -      -       +      -
    145C  PHE*     5.1     2.0    -      -       +      -
    158C  LYS      3.2    14.9    +      -       -      +
    159C  GLY      3.2     5.4    +      -       -      +
    161C  VAL*     1.3    74.0    -      -       -      +
    163C  GLY*     1.3    66.3    +      -       -      +
    165C  THR*     3.1     6.8    +      -       -      -
    166C  ARG*     2.9    45.3    +      -       +      +
    181C  ALA*     4.7     4.3    -      -       +      -
    183C  THR*     4.3    11.2    -      -       +      -
    238C  THR*     3.8    24.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 163 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144B  PHE*     3.8    17.9    -      -       -      -
    155B  VAL*     3.6    34.3    -      -       -      +
    156B  ALA*     4.1     0.7    -      -       -      -
    159B  GLY*     4.5     0.2    -      -       -      -
    159C  GLY      3.0    12.6    +      -       -      -
    160C  GLY      3.5     3.1    -      -       -      -
    162C  ILE*     1.3    78.1    -      -       -      +
    164C  PHE*     1.3    64.6    +      -       -      +
    166C  ARG*     3.2     3.1    +      -       -      +
    167C  ALA*     3.1    16.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 164 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  TRP*     4.1    15.0    -      +       -      -
    105B  TRP*     4.0    24.5    -      +       +      -
    152B  ALA*     4.6    13.0    -      -       +      -
    156B  ALA*     3.8    13.0    -      -       +      +
     87C  ASN*     5.8     0.2    -      -       -      -
    113C  LEU*     5.2     1.8    -      -       +      -
    116C  THR*     4.2    13.0    -      -       -      -
    117C  PHE*     4.0    24.2    -      +       -      -
    120C  THR*     3.7    35.7    -      -       +      -
    138C  SER*     5.7     4.0    -      -       -      -
    160C  GLY      2.7    19.8    +      -       -      +
    161C  VAL*     3.6     9.6    -      -       +      +
    163C  GLY*     1.3    73.3    -      -       -      +
    165C  THR*     1.3    60.9    +      -       -      +
    167C  ALA*     3.2     1.7    +      -       -      -
    168C  LEU*     2.8    62.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 165 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138C  SER*     4.1    10.9    +      -       -      -
    161C  VAL      2.7    24.6    +      -       -      -
    162C  ILE*     3.1     8.3    +      -       -      -
    164C  PHE*     1.3    78.4    -      -       -      +
    166C  ARG*     1.3    61.1    +      -       +      +
    168C  LEU*     3.2     7.6    +      -       -      +
    169C  ALA*     2.9    28.4    +      -       -      +
    179C  ALA*     3.4    26.0    -      -       +      +
    180C  ASN*     3.6    24.0    +      -       -      -
    181C  ALA*     3.8    15.4    -      -       +      +
    236C  GLY*     4.5     5.4    -      -       -      +
    237C  GLN      4.4     4.5    -      -       -      +
    238C  THR*     5.5     1.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 166 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ARG*     2.6    54.0    +      -       +      +
    248A  HIS*     3.3    31.1    -      -       -      +
    144B  PHE*     3.2    46.5    +      -       -      +
    145B  PHE*     3.8    16.2    -      -       -      +
    147B  GLY*     3.8    14.1    -      -       -      -
    155B  VAL*     5.3     0.7    -      -       +      -
    144C  PHE*     6.2     1.2    -      -       -      -
    145C  PHE*     5.9     1.8    -      -       -      -
    162C  ILE*     2.9    38.4    +      -       +      +
    163C  GLY      3.2     5.6    +      -       -      +
    165C  THR*     1.3    79.7    -      -       +      +
    167C  ALA*     1.3    62.3    +      -       -      +
    169C  ALA      3.4     2.6    +      -       -      -
    170C  THR*     3.1     2.8    -      -       -      +
    236C  GLY*     3.8    20.5    +      -       -      +
    238C  THR*     4.8     3.0    +      -       -      +
    248C  HIS*     4.4     8.1    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 167 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147B  GLY*     3.6    13.0    -      -       -      +
    148B  THR      4.0    11.2    -      -       -      +
    152B  ALA*     4.0    19.7    -      -       +      +
    155B  VAL*     3.9    22.9    -      -       +      -
    163C  GLY      3.1    11.3    +      -       -      +
    164C  PHE      3.8     6.3    -      -       -      +
    166C  ARG*     1.3    76.3    -      -       -      +
    168C  LEU*     1.3    58.0    +      -       -      +
    170C  THR*     3.3     6.4    +      -       -      +
    171C  GLU*     2.9    32.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 168 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  TRP*     3.7    44.2    -      -       +      -
    152B  ALA*     5.4     0.9    -      -       +      +
    120C  THR*     3.5    28.5    -      -       +      -
    136C  VAL*     4.6     7.0    -      -       +      -
    164C  PHE*     2.8    33.7    +      -       +      +
    165C  THR*     3.5     6.5    -      -       -      +
    167C  ALA*     1.3    74.8    -      -       -      +
    169C  ALA*     1.3    66.8    +      -       -      +
    171C  GLU*     2.8     6.1    +      -       +      +
    172C  LEU*     2.8    45.2    +      -       +      +
    179C  ALA*     4.0    17.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 169 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  ALA*     3.6     6.1    -      -       -      +
    247A  ARG*     3.8     4.5    -      -       -      +
    165C  THR      2.9     9.3    +      -       -      +
    166C  ARG      3.5     8.1    -      -       -      +
    167C  ALA      3.3     0.2    -      -       -      -
    168C  LEU*     1.3    75.1    -      -       -      +
    170C  THR*     1.3    57.2    +      -       -      +
    172C  LEU*     3.8     0.7    -      -       -      -
    173C  GLY*     3.0    27.7    +      -       -      -
    177C  ILE      4.5     2.2    -      -       -      +
    179C  ALA*     3.8     9.3    -      -       -      +
    235C  THR*     3.2    30.7    +      -       +      +
    236C  GLY*     3.3    28.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 170 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  ALA*     3.7    15.9    -      -       -      +
    247A  ARG*     2.8    38.4    -      -       -      +
    146B  ALA      4.6     0.2    -      -       -      +
    147B  GLY      2.7    30.4    +      -       -      +
    149B  PRO*     3.7    21.4    -      -       -      +
    166C  ARG      3.1     4.5    -      -       -      +
    167C  ALA      3.5     2.5    +      -       -      +
    169C  ALA*     1.3    72.1    -      -       -      +
    171C  GLU*     1.3    66.8    +      -       -      +
    172C  LEU      3.3     0.9    +      -       -      -
    173C  GLY*     3.6     7.8    +      -       -      -
    174C  LYS*     4.8     4.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 171 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  TRP*     3.1    53.0    +      -       +      +
    148B  THR      4.8     0.3    -      -       -      +
    149B  PRO*     3.4    18.1    -      -       -      +
    150B  ASN*     3.1    27.7    +      -       -      +
    151B  MSE      4.5     2.3    +      -       -      -
    152B  ALA*     4.9     7.7    -      -       +      +
    167C  ALA*     2.9    16.7    +      -       -      +
    168C  LEU*     2.8    20.4    +      -       +      +
    170C  THR*     1.3    79.0    +      -       -      +
    172C  LEU*     1.3    61.2    +      -       +      +
    174C  LYS*     3.7    29.8    +      -       -      -
    175C  TYR*     3.9     2.9    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 172 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  TRP*     3.9    23.6    -      -       +      +
    124C  THR*     3.6    33.4    -      -       +      +
    128C  ARG*     4.3     7.2    -      -       -      +
    136C  VAL*     4.9     0.7    -      -       +      -
    168C  LEU*     2.8    39.0    +      -       +      +
    169C  ALA*     5.4     0.2    -      -       -      -
    171C  GLU*     1.3    79.7    -      -       +      +
    173C  GLY*     1.3    67.4    +      -       -      +
    174C  LYS      3.0     3.1    -      -       -      -
    175C  TYR*     2.9    38.4    +      -       +      +
    177C  ILE*     3.3    44.1    +      -       +      +
    179C  ALA*     5.5     1.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 173 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  ALA*     3.3    26.6    -      -       -      +
    210A  MSE      3.4    20.2    -      -       -      +
    211A  LYS*     3.1    13.7    +      -       -      -
    169C  ALA      3.0    15.9    +      -       -      -
    170C  THR      3.6     3.6    +      -       -      -
    172C  LEU*     1.3    78.0    -      -       -      +
    174C  LYS*     1.3    56.0    +      -       -      +
    176C  ASN      3.1    14.6    +      -       -      -
    177C  ILE      4.1     1.6    -      -       -      -
    235C  THR*     6.0     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page


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