Contacts of the helix formed by residues 148 - 173 (chain A) in PDB entry 2GDZ


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 GLN 148 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  ASN*     2.8    38.0    +      -       -      +
     97A  GLU*     3.3    12.3    -      -       +      +
    145A  VAL*     3.0    31.1    +      -       +      +
    147A  GLN*     1.3    85.8    -      -       -      +
    149A  PRO*     1.3    60.8    -      -       -      +
    150A  VAL      3.2     2.9    +      -       -      -
    151A  TYR*     3.3    26.4    +      -       +      -
    152A  CYS*     2.8    28.1    +      -       -      +
    190A  ILE*     5.8     2.8    -      -       -      +
    194A  ILE*     4.8     6.2    -      -       -      +
    200A  MET*     4.2     6.5    -      -       +      -
    210A  ILE*     3.7    20.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  GLU*     3.3    13.2    -      -       -      +
    145A  VAL      3.9     6.5    -      -       -      +
    146A  ALA*     3.6    13.0    -      -       -      +
    147A  GLN      3.6     2.2    -      -       -      -
    148A  GLN*     1.3    88.1    -      -       -      +
    150A  VAL*     1.3    59.1    +      -       +      +
    152A  CYS*     3.4     6.8    -      -       +      +
    153A  ALA*     2.9    26.2    +      -       -      +
    203A  TYR*     3.4    36.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  GLU*     2.9    18.6    +      -       -      +
    100A  TRP*     3.6    45.5    -      -       +      +
    103A  THR*     4.6     7.2    -      -       +      -
    104A  LEU*     3.6    33.4    -      -       +      -
    149A  PRO*     1.3    77.8    -      -       +      +
    151A  TYR*     1.3    68.5    +      -       -      +
    153A  ALA*     3.1     6.9    +      -       +      +
    154A  SER*     2.8    23.0    +      -       -      -
    203A  TYR*     6.1     0.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  VAL      3.4    27.8    -      -       -      -
     95A  ASN*     4.2    14.6    -      -       +      +
     97A  GLU*     2.8    17.7    +      -       -      +
    103A  THR*     4.6     7.5    -      -       +      +
    107A  ASN*     3.5    10.8    -      -       -      -
    138A  SER*     4.2     3.8    -      -       -      -
    140A  ALA*     3.8    25.4    -      -       +      -
    148A  GLN*     3.6    30.7    -      -       +      +
    150A  VAL*     1.3    75.8    -      -       -      +
    152A  CYS*     1.3    63.2    +      -       -      +
    154A  SER*     2.7    22.6    +      -       -      -
    155A  LYS*     2.9    24.5    +      -       +      +
    190A  ILE*     4.6     8.1    -      -       +      +
    300A  NAD      2.6    50.9    +      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140A  ALA*     3.3    27.6    -      -       -      +
    143A  MET      3.5    10.8    -      -       -      -
    144A  PRO*     3.9    12.8    -      -       -      -
    145A  VAL*     4.0    12.8    -      -       +      +
    148A  GLN      2.8    21.3    +      -       -      +
    149A  PRO*     3.4     9.0    -      -       +      +
    151A  TYR*     1.3    73.9    -      -       -      +
    153A  ALA*     1.3    55.7    +      -       -      +
    155A  LYS      3.2     0.9    +      -       -      -
    156A  HIS*     2.9    54.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  LEU*     4.6     9.9    -      -       +      -
    108A  LEU*     4.9     1.7    -      -       -      +
    149A  PRO      2.9    17.0    +      -       -      +
    150A  VAL*     3.1    14.3    +      -       +      +
    152A  CYS*     1.3    73.0    -      -       -      +
    154A  SER*     1.3    54.0    +      -       -      +
    156A  HIS*     3.2     7.6    +      -       -      +
    157A  GLY*     2.8    32.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  THR*     4.8     1.8    -      -       -      -
    104A  LEU*     3.9    19.5    -      -       -      +
    107A  ASN*     3.2    42.3    +      -       -      +
    108A  LEU*     3.9    12.0    -      -       -      +
    150A  VAL      2.8    14.5    +      -       -      -
    151A  TYR*     2.7    18.8    +      -       -      -
    153A  ALA*     1.3    71.7    -      -       -      +
    155A  LYS*     1.3    62.7    +      -       -      +
    157A  GLY*     3.3     2.9    +      -       -      -
    158A  ILE*     3.0    30.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  ALA      5.3     1.0    +      -       -      -
     93A  GLY*     5.2     0.2    -      -       -      -
    107A  ASN*     4.2    13.0    +      -       -      +
    136A  MET      3.0    17.4    +      -       -      -
    137A  SER*     2.8    40.0    +      -       -      +
    138A  SER*     4.0     4.3    -      -       -      +
    140A  ALA*     3.8     3.1    -      -       +      -
    141A  GLY*     3.4    24.8    -      -       -      +
    151A  TYR*     2.9    50.8    +      -       +      +
    152A  CYS      3.9     0.2    -      -       -      +
    154A  SER*     1.3    78.3    -      -       -      +
    156A  HIS*     1.3    64.8    +      -       -      +
    158A  ILE*     3.3    12.5    +      -       +      +
    159A  VAL*     3.2    12.3    +      -       -      +
    300A  NAD      2.9    43.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140A  ALA      2.9    28.7    +      -       -      -
    141A  GLY      3.3    26.1    +      -       -      -
    142A  LEU*     3.7     9.4    +      -       -      -
    143A  MET      3.6    12.9    -      -       -      -
    144A  PRO*     4.8     0.4    -      -       +      -
    152A  CYS*     2.9    33.8    +      -       -      +
    153A  ALA*     3.5     7.6    -      -       -      +
    155A  LYS*     1.3    73.6    -      -       -      +
    157A  GLY*     1.3    66.6    +      -       -      +
    159A  VAL*     3.1     4.7    +      -       -      +
    160A  GLY*     3.0    21.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  LEU*     3.6    21.7    -      -       -      +
    153A  ALA      2.8    15.3    +      -       -      -
    154A  SER      3.3     4.9    +      -       -      -
    155A  LYS      3.2     0.2    -      -       -      -
    156A  HIS*     1.3    76.8    -      -       -      +
    158A  ILE*     1.3    62.2    +      -       -      +
    160A  GLY*     3.4     1.0    +      -       -      -
    161A  PHE*     2.9    26.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ASN      3.2    26.7    -      -       -      +
    108A  LEU*     4.0     8.7    -      -       +      -
    111A  VAL*     4.1    15.9    -      -       +      -
    135A  ASN*     3.6    29.4    -      -       +      -
    136A  MET      3.3    20.9    -      -       -      +
    137A  SER*     4.0    17.3    -      -       -      +
    154A  SER      3.0    15.4    +      -       -      +
    155A  LYS*     3.6    22.4    -      -       +      +
    156A  HIS      3.2     0.4    -      -       -      -
    157A  GLY*     1.3    76.8    -      -       -      +
    159A  VAL*     1.3    56.8    +      -       -      +
    161A  PHE*     4.4     4.7    -      -       -      -
    162A  THR*     2.7    39.3    +      -       -      +
    180A  ALA*     4.5     2.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  SER*     3.4    26.7    -      -       -      +
    141A  GLY      3.8    18.2    -      -       -      +
    142A  LEU*     4.2    12.6    -      -       +      -
    155A  LYS      3.2     5.6    +      -       -      +
    156A  HIS*     3.1     7.5    +      -       -      +
    158A  ILE*     1.3    75.6    -      -       -      +
    160A  GLY*     1.3    64.6    +      -       -      +
    162A  THR*     3.8     1.1    -      -       -      -
    163A  ARG*     3.0    37.5    +      -       -      +
    180A  ALA*     5.2     1.1    -      -       +      -
    182A  CYS*     4.2     7.4    -      -       -      -
    242A  ILE*     4.2    14.1    -      -       +      -
    256A  TYR*     3.5    24.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  HIS      3.0    12.8    +      -       -      -
    157A  GLY      3.9     1.3    -      -       -      -
    159A  VAL*     1.3    78.4    -      -       -      +
    161A  PHE*     1.3    61.5    +      -       -      +
    163A  ARG*     4.1     5.0    -      -       -      +
    164A  SER*     2.8    31.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  VAL*     4.4     5.2    -      -       +      -
    112A  ILE*     3.9    44.9    -      -       +      -
    115A  THR*     3.6    43.7    -      -       +      -
    116A  TYR*     3.8    33.2    -      +       -      -
    135A  ASN*     4.2    12.1    -      -       -      -
    157A  GLY      2.9    20.7    +      -       -      +
    158A  ILE*     3.8     2.9    -      -       -      +
    160A  GLY*     1.3    74.9    -      -       -      +
    162A  THR*     1.3    57.0    +      -       -      +
    164A  SER*     3.3     6.0    +      -       -      -
    165A  ALA*     2.8    43.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  ASN*     3.0    30.0    +      -       -      +
    158A  ILE*     2.7    26.8    +      -       -      +
    159A  VAL      4.0     1.6    -      -       -      -
    161A  PHE*     1.3    77.2    -      -       -      +
    163A  ARG*     1.4    64.9    -      -       -      +
    165A  ALA*     3.3     4.3    +      -       -      +
    166A  ALA*     2.9    23.2    +      -       -      +
    178A  LEU*     3.7    11.1    -      -       +      +
    179A  ASN*     3.5    43.3    -      -       -      +
    180A  ALA*     3.9     8.3    -      -       +      +
    240A  GLY*     5.2     0.9    -      -       -      -
    242A  ILE*     4.8     4.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  VAL*     3.0    23.6    +      -       -      +
    160A  GLY*     4.1     4.7    -      -       -      +
    162A  THR*     1.4    74.7    -      -       -      +
    164A  SER*     1.3    63.5    +      -       -      +
    166A  ALA*     3.5     7.0    +      -       -      +
    167A  LEU*     3.2    29.4    +      -       +      +
    240A  GLY*     4.2    13.2    +      -       -      +
    242A  ILE*     3.8    17.7    -      -       +      -
    256A  TYR*     3.4    71.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160A  GLY      2.8    23.3    +      -       -      -
    161A  PHE*     3.5     5.6    -      -       -      -
    163A  ARG*     1.3    75.7    -      -       -      +
    165A  ALA*     1.3    65.3    +      -       -      +
    167A  LEU*     3.1    13.6    +      -       -      +
    168A  ALA*     3.0    21.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  THR*     4.9     0.7    -      -       +      -
    116A  TYR*     5.7     2.2    -      -       +      -
    119A  LEU*     5.5     5.9    -      -       +      +
    161A  PHE*     2.8    40.3    +      -       +      +
    162A  THR*     3.9     2.9    -      -       -      +
    164A  SER*     1.3    72.8    -      -       -      +
    166A  ALA*     1.4    52.2    +      -       -      +
    168A  ALA*     3.3     9.1    +      -       -      +
    169A  ALA*     2.8    35.0    +      -       -      +
    178A  LEU*     3.7    26.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  THR      2.9    14.4    +      -       -      +
    163A  ARG      3.6     4.0    -      -       -      +
    164A  SER      3.2     0.2    -      -       -      -
    165A  ALA*     1.4    75.5    -      -       -      +
    167A  LEU*     1.3    63.3    +      -       +      +
    169A  ALA*     3.3     3.1    +      -       -      +
    170A  ASN*     3.3    13.7    +      -       -      -
    178A  LEU*     3.7    11.6    -      -       -      +
    239A  ASN*     3.2    31.6    +      -       -      +
    240A  GLY*     3.3    40.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  ARG*     3.2    14.8    +      -       +      +
    164A  SER*     3.1    13.1    +      -       -      +
    166A  ALA*     1.3    78.7    -      -       +      +
    168A  ALA*     1.3    60.8    -      -       -      +
    170A  ASN*     3.1    28.8    +      -       +      +
    171A  LEU*     3.1    20.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164A  SER      3.0    13.0    +      -       -      +
    165A  ALA*     3.4    12.8    -      -       -      +
    167A  LEU*     1.3    73.6    -      -       -      +
    169A  ALA*     1.3    58.8    +      -       -      +
    171A  LEU*     3.1    14.1    +      -       -      +
    172A  MET*     2.9    52.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  LEU*     5.6     2.5    -      -       +      -
    165A  ALA      2.8    17.5    +      -       -      +
    166A  ALA      3.5     9.6    -      -       -      +
    167A  LEU      3.3     0.2    -      -       -      -
    168A  ALA*     1.3    73.4    -      -       -      +
    170A  ASN*     1.3    62.8    +      -       -      +
    172A  MET*     3.4     5.3    +      -       -      -
    173A  ASN*     3.0    19.1    +      -       -      -
    174A  SER*     3.2    24.5    +      -       -      +
    175A  GLY      4.7     0.5    +      -       -      -
    176A  VAL*     3.2    27.1    -      -       +      +
    178A  LEU*     3.7     9.6    -      -       +      -
    239A  ASN*     5.0     2.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  ALA      3.3     4.0    +      -       -      -
    167A  LEU*     3.1    23.2    +      -       -      +
    169A  ALA*     1.3    77.4    -      -       -      +
    171A  LEU*     1.3    66.4    +      -       +      +
    173A  ASN*     3.2    14.0    +      -       -      +
    239A  ASN*     3.1    29.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  LEU*     3.1    16.0    +      -       +      +
    168A  ALA*     3.1    15.0    +      -       -      +
    170A  ASN*     1.3    78.9    -      -       +      +
    172A  MET*     1.3    64.1    +      -       +      +
    173A  ASN*     3.6     0.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  LEU*     6.1     4.5    -      -       -      -
    125A  GLN*     3.6    19.8    +      -       +      +
    168A  ALA*     2.9    35.0    +      -       +      +
    169A  ALA*     3.9     6.7    -      -       -      +
    171A  LEU*     1.3    77.2    -      -       +      +
    173A  ASN*     1.3    70.3    +      -       -      +
    174A  SER*     4.2    11.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  LYS*     3.9    18.9    +      -       -      +
    125A  GLN*     3.2    25.4    +      -       -      +
    169A  ALA      3.0     7.4    +      -       -      -
    170A  ASN*     3.2    10.7    +      -       -      +
    171A  LEU      3.3     1.3    -      -       -      +
    172A  MET*     1.3    78.3    -      -       -      +
    174A  SER*     1.3    62.4    +      -       -      +
    175A  GLY*     3.2     7.2    +      -       -      +
----------------------------------------------------------
 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