Contacts of the helix formed by residues 145 - 167 (chain D) in PDB entry 2NP5


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 GLU 145 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178B  HIS*     3.4    24.8    +      -       -      -
    182B  ILE*     3.8    32.0    -      -       +      +
    143D  THR      3.5     0.8    +      -       -      -
    144D  PRO*     1.3    74.6    -      -       +      +
    146D  ALA*     1.3    65.0    +      -       -      +
    147D  GLU      3.2     2.8    +      -       -      -
    148D  THR*     3.2    12.1    +      -       -      -
    149D  ARG*     2.9    32.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 146 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135D  SER*     4.2     2.4    -      -       -      +
    138D  LEU*     3.6    15.8    -      -       +      +
    139D  ILE*     3.6    41.3    -      -       +      +
    143D  THR*     3.5    18.5    +      -       -      +
    144D  PRO      3.2     3.7    +      -       -      -
    145D  GLU*     1.3    75.9    -      -       -      +
    147D  GLU*     1.3    58.2    +      -       +      +
    149D  ARG      3.5     0.2    +      -       -      -
    150D  ALA*     2.9    29.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 147 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175B  TYR*     4.4     1.9    +      -       -      -
    139C  ILE*     5.1    13.7    -      -       -      +
    131D  ARG*     5.1     5.7    +      -       -      +
    135D  SER*     4.1    22.6    +      -       -      +
    139D  ILE*     4.7    15.0    -      -       +      +
    145D  GLU      3.4     1.0    -      -       -      -
    146D  ALA*     1.3    75.1    -      -       +      +
    148D  THR*     1.3    67.9    +      -       -      +
    150D  ALA*     3.3     3.3    +      -       -      +
    151D  ALA*     3.0    22.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 148 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175B  TYR*     4.1    16.1    +      -       -      +
    178B  HIS*     3.1    40.6    +      -       +      +
    179B  ALA*     3.9    20.6    -      -       +      -
    182B  ILE*     3.9    20.6    -      -       +      -
    145D  GLU*     3.2    16.0    +      -       -      -
    147D  GLU*     1.3    79.5    -      -       -      +
    149D  ARG*     1.3    56.1    +      -       -      +
    151D  ALA*     3.2     3.1    +      -       -      +
    152D  LEU*     2.9    27.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 149 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182B  ILE*     4.2    13.8    -      -       +      +
    186B  MSE      3.8    34.6    -      -       -      +
    189B  GLN*     5.9     2.8    -      -       -      +
    138D  LEU*     4.1     9.2    -      -       +      -
    143D  THR*     3.9     3.9    -      -       -      +
    144D  PRO*     3.2    37.9    +      -       -      +
    145D  GLU*     2.9    23.1    +      -       -      +
    146D  ALA      3.9     3.1    -      -       -      +
    148D  THR*     1.3    75.3    -      -       -      +
    150D  ALA*     1.3    56.6    +      -       -      +
    152D  LEU*     3.2     5.4    +      -       -      +
    153D  LEU*     2.8    26.2    +      -       -      +
    186D  MSE      3.7     3.6    +      -       -      -
    187D  ILE*     2.7    59.5    +      -       +      +
    189D  GLN*     2.8    27.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 150 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131D  ARG*     4.0     8.2    -      -       +      +
    134D  LEU*     3.8    21.6    -      -       +      +
    135D  SER*     3.6    33.9    -      -       -      +
    138D  LEU*     3.8     7.3    -      -       +      +
    146D  ALA      2.9    18.2    +      -       -      +
    147D  GLU      3.5     5.8    -      -       -      +
    148D  THR      3.3     0.2    -      -       -      -
    149D  ARG*     1.3    76.1    -      -       -      +
    151D  ALA*     1.3    63.6    +      -       -      +
    153D  LEU*     3.3     6.4    +      -       -      +
    154D  LEU*     3.2    18.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 151 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160B  LEU*     5.0     3.3    -      -       +      +
    163B  ASP*     5.1     0.7    -      -       -      +
    171B  TYR*     5.1     6.1    +      -       +      +
    175B  TYR*     3.2    32.1    -      -       +      +
    179B  ALA*     5.9     0.9    -      -       +      -
    131D  ARG*     3.6    33.6    -      -       -      +
    147D  GLU      3.0     9.1    +      -       -      +
    148D  THR*     3.5     5.8    -      -       +      +
    150D  ALA*     1.3    75.6    -      -       -      +
    152D  LEU*     1.3    58.7    +      -       +      +
    154D  LEU*     3.4     2.9    +      -       -      +
    155D  ALA*     2.9    29.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 152 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156B  THR*     3.5    31.0    -      -       +      -
    160B  LEU*     4.2     5.4    -      -       +      -
    179B  ALA*     3.6    42.2    -      -       +      +
    182B  ILE*     3.7    13.5    -      -       +      -
    183B  GLN*     3.5    31.0    -      -       +      +
    186B  MSE      3.6    13.0    -      -       +      -
    148D  THR*     2.9    17.2    +      -       +      +
    149D  ARG*     3.5     8.3    -      -       -      +
    151D  ALA*     1.3    74.7    -      -       -      +
    153D  LEU*     1.3    59.0    +      -       -      +
    155D  ALA*     3.7     1.5    -      -       -      +
    156D  THR*     2.6    38.1    +      -       -      -
    183D  GLN*     4.3     4.5    -      -       -      +
    187D  ILE*     4.6     0.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 153 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85D  LEU*     4.2    32.1    -      -       +      -
     89D  MSE      3.9    21.8    -      -       +      -
    134D  LEU*     4.2     9.2    -      -       +      -
    138D  LEU*     5.9     1.8    -      -       +      -
    149D  ARG      2.8    19.7    +      -       -      +
    150D  ALA*     3.3     7.2    +      -       -      +
    152D  LEU*     1.3    73.9    -      -       -      +
    154D  LEU*     1.3    63.5    +      -       -      +
    156D  THR*     3.4     0.9    +      -       -      -
    157D  VAL*     3.1    31.9    +      -       +      +
    180D  LEU*     3.9    25.1    -      -       +      -
    183D  GLN*     3.8    28.3    -      -       +      +
    184D  ILE*     4.1     9.9    -      -       +      -
    187D  ILE*     4.1    16.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 154 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163B  ASP*     4.9     2.0    -      -       -      +
    171B  TYR*     5.5     1.3    -      -       -      +
     89D  MSE      4.3     8.3    -      -       -      -
     92D  LEU*     3.7    29.6    -      -       +      -
    127D  LEU*     3.7    35.2    -      -       +      +
    130D  ILE*     3.6    34.8    -      -       +      -
    131D  ARG*     3.8    14.1    -      -       +      -
    134D  LEU*     4.1     5.3    -      -       +      +
    150D  ALA      3.2     9.9    +      -       -      +
    151D  ALA      3.8     7.0    -      -       -      +
    153D  LEU*     1.3    79.3    -      -       -      +
    155D  ALA*     1.3    57.7    +      -       -      +
    157D  VAL*     3.3     1.6    +      -       -      -
    158D  ASP*     2.9    47.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 155 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156B  THR*     4.2     3.4    -      -       +      +
    159B  GLY*     3.1    11.7    -      -       -      -
    160B  LEU*     3.7    36.3    -      -       +      +
    163B  ASP*     3.5    21.7    +      -       -      +
    171B  TYR*     5.7     0.2    -      -       +      -
    151D  ALA      2.9    18.6    +      -       -      +
    152D  LEU*     3.7     5.2    -      -       -      +
    153D  LEU      3.3     0.2    -      -       -      -
    154D  LEU*     1.3    77.1    -      -       -      +
    156D  THR*     1.3    57.2    +      -       -      +
    158D  ASP*     3.3     1.2    +      -       -      -
    159D  GLY*     2.8    25.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 156 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152B  LEU*     3.6    39.3    -      -       +      +
    155B  ALA*     3.9     3.3    -      -       +      +
    156B  THR*     2.7    36.1    +      -       -      +
    183B  GLN*     4.0     0.3    +      -       -      -
    152D  LEU      2.6    21.6    +      -       -      -
    153D  LEU      3.9     2.9    -      -       -      -
    155D  ALA*     1.3    75.4    -      -       -      +
    157D  VAL*     1.3    59.3    +      -       -      +
    159D  GLY*     3.4     0.9    +      -       -      -
    160D  LEU*     2.8    36.8    +      -       +      +
    183D  GLN*     3.4    24.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 157 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89D  MSE      3.7    22.7    -      -       +      +
     92D  LEU*     3.6    35.2    -      -       +      -
     93D  LEU*     3.6    21.0    -      -       +      +
    153D  LEU*     3.1    20.4    +      -       +      +
    154D  LEU      3.7     3.6    -      -       -      +
    156D  THR*     1.3    76.5    -      -       -      +
    158D  ASP*     1.3    64.9    +      -       -      +
    160D  LEU*     4.4     5.2    -      -       +      -
    161D  ALA*     3.0    24.3    +      -       -      +
    180D  LEU*     3.8    29.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 158 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159B  GLY*     4.3     4.3    -      -       -      -
    162B  LEU*     4.1    12.5    -      -       +      +
    163B  ASP*     2.6    36.8    -      -       -      +
     92D  LEU*     4.3    11.1    -      -       -      +
    123D  ARG*     3.7    11.4    +      -       -      -
    127D  LEU*     3.7    11.4    -      -       -      +
    154D  LEU*     2.9    34.0    +      -       -      +
    155D  ALA      3.6     4.9    -      -       -      +
    157D  VAL*     1.3    72.1    -      -       -      +
    159D  GLY*     1.3    58.4    +      -       -      +
    161D  ALA*     3.5     5.8    +      -       -      +
    162D  LEU*     3.0    28.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 159 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155B  ALA*     3.3    27.8    -      -       -      -
    158B  ASP*     4.3     3.1    -      -       -      -
    159B  GLY*     3.5    11.2    -      -       -      -
    155D  ALA      2.8    11.5    +      -       -      -
    156D  THR      3.7     0.2    -      -       -      -
    158D  ASP*     1.3    76.1    -      -       -      +
    160D  LEU*     1.3    58.8    +      -       -      +
    162D  LEU*     3.2     5.3    +      -       -      +
    163D  ASP*     2.8    34.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 160 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151B  ALA      4.9     4.3    -      -       -      +
    152B  LEU*     4.0    21.8    -      -       +      -
    155B  ALA*     3.7    19.0    -      -       +      +
     93D  LEU*     3.8    23.6    -      -       +      -
    156D  THR*     2.8    27.0    +      -       +      +
    157D  VAL*     3.4     4.2    +      -       +      -
    159D  GLY*     1.3    71.2    -      -       -      +
    161D  ALA*     1.3    58.4    +      -       -      +
    163D  ASP*     3.9     3.3    -      -       -      +
    164D  ALA*     2.9    32.8    +      -       -      +
    171D  TYR*     4.0    24.5    -      -       +      -
    175D  TYR*     5.4     1.3    -      -       +      -
    176D  LEU*     4.1    19.1    -      -       +      +
    179D  ALA*     4.1    21.5    -      -       +      -
    180D  LEU*     4.6     9.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 161 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92D  LEU      3.4    25.6    -      -       -      +
     93D  LEU*     4.0     0.8    -      -       +      +
     94D  PRO*     4.0    17.9    -      -       +      +
    103D  ALA*     4.3    11.2    -      -       +      +
    107D  ALA*     6.5     0.4    -      -       +      -
    157D  VAL      3.0    15.9    +      -       -      +
    158D  ASP*     3.8     6.3    -      -       -      +
    160D  LEU*     1.3    78.1    -      -       -      +
    162D  LEU*     1.3    56.3    +      -       -      +
    164D  ALA*     3.3     1.4    +      -       -      +
    165D  ILE*     2.8    38.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 162 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  ALA*     4.4     9.6    -      -       +      +
    110B  ALA*     3.7    31.0    -      -       +      +
    111B  VAL*     3.9    12.3    -      -       +      +
    123B  ARG*     5.2     1.8    -      -       -      +
    158B  ASP*     4.6    18.2    -      -       +      +
    162B  LEU*     4.2    32.3    -      -       +      -
    107D  ALA*     3.9    24.9    -      -       +      -
    158D  ASP      3.0    17.9    +      -       -      +
    159D  GLY*     3.2     4.5    +      -       -      +
    161D  ALA*     1.3    77.8    -      -       -      +
    163D  ASP*     1.3    65.2    +      -       -      +
    165D  ILE*     3.2    10.1    +      -       +      +
    166D  GLY*     3.0    21.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 163 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  ARG*     3.1    19.6    +      -       -      +
    127B  LEU*     4.0    12.5    -      -       +      +
    154B  LEU*     4.4     1.2    -      -       -      +
    155B  ALA*     3.6    20.8    +      -       -      +
    158B  ASP*     2.6    33.0    -      -       -      +
    159D  GLY      2.8    23.4    +      -       -      +
    160D  LEU*     3.9     2.9    -      -       -      +
    162D  LEU*     1.3    75.8    -      -       -      +
    164D  ALA*     1.3    58.3    +      -       -      +
    166D  GLY      3.7     0.9    -      -       -      -
    167D  SER*     2.8    34.5    +      -       -      +
    171D  TYR*     3.8    29.2    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 164 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94D  PRO*     3.9    20.8    -      -       +      +
    160D  LEU      2.9    19.5    +      -       -      +
    161D  ALA      3.9     2.5    -      -       -      +
    163D  ASP*     1.3    76.5    -      -       -      +
    165D  ILE*     1.3    63.1    +      -       -      +
    167D  SER      4.2     0.7    -      -       -      -
    168D  PRO*     3.1    26.3    -      -       -      +
    171D  TYR*     3.4    33.6    -      -       +      +
    176D  LEU*     4.2     9.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 165 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  ALA      4.3     8.1    -      -       -      +
    111B  VAL*     4.7     4.9    -      -       -      -
    113B  ALA      4.6     0.2    -      -       -      -
    114B  ALA*     3.4    39.0    -      -       +      +
     94D  PRO*     4.8     7.4    -      -       +      -
    100D  SER*     5.0     3.6    -      -       -      +
    103D  ALA*     3.2    44.9    -      -       +      +
    104D  HIS*     3.5    18.6    -      -       +      +
    107D  ALA*     3.9    15.7    -      -       +      -
    161D  ALA*     2.8    28.7    +      -       +      +
    162D  LEU*     3.5     6.1    -      -       +      +
    164D  ALA*     1.3    77.4    -      -       -      +
    166D  GLY*     1.3    61.2    +      -       -      +
    167D  SER      3.6     0.5    +      -       -      -
    168D  PRO*     3.7    12.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 166 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  ALA      3.5    19.5    -      -       -      -
    113B  ALA*     3.5    11.7    -      -       -      +
    114B  ALA      4.5     0.2    -      -       -      -
    120B  ALA*     3.3    26.9    -      -       -      +
    123B  ARG*     3.8    10.7    -      -       -      +
    162D  LEU      3.0    13.8    +      -       -      -
    163D  ASP      3.7     0.9    -      -       -      -
    165D  ILE*     1.3    77.7    -      -       -      +
    167D  SER*     1.3    63.9    +      -       -      +
    168D  PRO*     3.9     2.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 167 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120B  ALA*     3.7     3.5    +      -       -      -
    123B  ARG*     3.5     6.1    -      -       -      +
    124B  ARG*     3.1    39.7    +      -       -      -
    127B  LEU*     3.8    12.9    -      -       -      +
    163D  ASP      2.8    13.8    +      -       -      -
    164D  ALA      3.5     2.9    -      -       -      -
    166D  GLY*     1.3    80.8    +      -       -      +
    168D  PRO*     1.4    69.8    -      -       -      +
    169D  ALA      3.1     4.1    +      -       -      -
    170D  LEU*     3.3    12.2    +      -       -      -
    171D  TYR*     3.3    15.0    -      -       -      -
----------------------------------------------------------
 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