Contacts of the helix formed by residues 247 - 273 (chain A) in PDB entry 1UU1


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 HIS 247 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  LEU*     3.4    30.6    -      -       +      +
     40A  GLU*     2.7    41.3    +      -       -      -
    243A  VAL      3.0    21.8    +      -       -      +
    244A  ALA      3.0     5.8    +      -       -      +
    246A  ASP*     1.3    86.5    +      -       +      +
    248A  ARG*     1.3    63.7    +      -       -      +
    249A  GLU      2.9     5.7    +      -       -      -
    250A  ILE*     3.0    33.0    +      -       +      +
    251A  PHE*     3.4     8.1    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 248 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  LYS*     3.8    12.5    +      -       -      +
     67A  SER*     3.6    34.2    +      -       -      -
     68A  TYR*     3.7    40.6    -      -       +      +
    204A  PHE*     4.8     9.3    -      -       +      -
    244A  ALA      3.0     9.0    +      -       -      +
    245A  LEU*     3.1    31.5    +      -       -      +
    246A  ASP*     3.5     1.0    +      -       -      -
    247A  HIS*     1.3    74.9    -      -       -      +
    249A  GLU*     1.3    66.5    +      -       +      +
    250A  ILE      3.3     0.2    -      -       -      -
    251A  PHE*     3.3    11.0    +      -       -      +
    252A  GLU*     2.9    39.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 249 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  HIS      2.9     2.6    +      -       -      -
    248A  ARG*     1.3    81.3    -      -       +      +
    250A  ILE*     1.3    69.9    +      -       +      +
    251A  PHE      3.3     0.2    +      -       -      -
    252A  GLU*     3.4    17.2    +      -       -      +
    253A  GLU*     3.3    20.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 250 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  PRO*     4.3    23.8    -      -       +      -
     36A  ASP*     6.0     1.3    -      -       -      +
     37A  LEU*     5.1     4.9    -      -       +      -
    247A  HIS*     3.0    44.8    +      -       +      +
    249A  GLU*     1.3    82.9    -      -       +      +
    251A  PHE*     1.3    64.9    +      -       +      +
    253A  GLU*     3.6    16.8    -      -       -      +
    254A  ARG*     3.3    29.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 251 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  PHE*     3.8    14.1    -      +       -      -
     34A  PRO*     3.9    20.4    -      -       +      -
     37A  LEU*     3.6    24.9    -      -       +      -
    203A  ALA*     3.4    23.6    -      -       +      +
    204A  PHE*     3.6    42.0    -      +       +      -
    244A  ALA*     3.4    30.3    -      -       +      -
    247A  HIS      3.4    16.8    -      -       -      -
    248A  ARG*     3.3     6.7    +      -       -      +
    249A  GLU      3.1     0.6    -      -       -      -
    250A  ILE*     1.3    77.2    -      -       +      +
    252A  GLU*     1.3    60.3    +      -       +      +
    253A  GLU      3.1     2.0    -      -       -      -
    254A  ARG*     3.3    19.8    +      -       -      +
    255A  THR*     2.8    32.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 252 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  TYR*     5.1     7.2    -      -       +      -
    248A  ARG*     2.9    37.2    -      -       +      +
    249A  GLU*     3.4    17.5    +      -       -      +
    251A  PHE*     1.3    78.0    -      -       +      +
    253A  GLU*     1.3    58.0    +      -       -      +
    255A  THR*     3.7     6.9    -      -       -      -
    256A  LYS*     2.8    29.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 253 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249A  GLU      3.3    10.0    +      -       -      +
    250A  ILE*     3.6    25.2    -      -       -      +
    251A  PHE      3.1     0.4    -      -       -      -
    252A  GLU*     1.3    76.8    -      -       -      +
    254A  ARG*     1.3    72.7    +      -       -      +
    256A  LYS*     3.2    11.8    +      -       -      +
    257A  PHE*     3.1    20.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 254 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  ASN*     4.9    10.8    -      -       -      +
     31A  PHE*     3.5    40.4    -      -       +      +
     32A  PRO*     2.7    34.5    +      -       -      +
     34A  PRO*     3.7    29.1    -      -       -      +
    203A  ALA      5.5     0.4    -      -       -      +
    205A  SER*     3.5    20.0    +      -       -      -
    250A  ILE*     3.3    23.5    +      -       -      +
    251A  PHE*     3.3    22.3    +      -       -      +
    253A  GLU*     1.3    83.6    +      -       -      +
    255A  THR*     1.3    58.8    +      -       -      +
    257A  PHE*     3.2    10.1    +      -       -      +
    258A  ILE*     2.8    32.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 255 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  ASN*     5.3     1.1    +      -       -      +
    178A  GLU*     3.4    28.5    -      -       +      +
    179A  PHE*     3.6    29.1    -      -       +      -
    203A  ALA*     4.0    17.7    +      -       -      +
    251A  PHE      2.8    20.3    +      -       -      -
    252A  GLU*     3.8     7.8    -      -       -      -
    254A  ARG*     1.3    75.9    -      -       -      +
    256A  LYS*     1.3    65.4    +      -       -      +
    258A  ILE*     3.1     9.3    +      -       -      +
    259A  VAL*     2.9    25.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 256 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    252A  GLU      2.8    19.1    +      -       -      +
    253A  GLU*     3.2    10.7    +      -       -      +
    255A  THR*     1.3    78.0    -      -       -      +
    257A  PHE*     1.3    61.0    +      -       -      +
    259A  VAL*     2.9    29.7    -      -       +      +
    260A  GLU*     3.1    50.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 257 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  PHE*     3.4    37.9    -      +       +      -
    253A  GLU*     3.1    12.6    +      -       +      +
    254A  ARG*     3.3     9.4    -      -       -      +
    256A  LYS*     1.3    78.6    -      -       -      +
    258A  ILE*     1.3    71.2    -      -       +      +
    260A  GLU*     3.2    16.8    +      -       +      +
    261A  GLU*     3.0    48.1    +      -       +      +
    319A  GLY      4.0    15.3    -      -       -      -
    320A  LYS*     4.7     0.2    -      -       -      -
    321A  ARG*     3.4    46.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 258 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  ASN*     4.8     5.2    -      -       -      +
     30A  PRO*     3.3    41.7    -      -       +      -
     31A  PHE*     4.3     1.6    -      -       +      -
    179A  PHE*     3.9    13.7    -      -       +      -
    254A  ARG      2.8    20.9    +      -       -      +
    255A  THR*     3.1    11.4    +      -       -      +
    257A  PHE*     1.3    90.2    -      -       +      +
    259A  VAL*     1.3    58.5    +      -       -      +
    261A  GLU*     3.4     5.0    +      -       -      +
    262A  ARG      2.9    21.8    +      -       -      -
    281A  GLY      5.1     0.4    -      -       -      +
    282A  ASN*     3.8    23.8    -      -       +      -
    318A  ILE*     3.5    33.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 259 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  PHE*     3.8    35.9    -      -       +      +
    255A  THR*     2.9    18.1    +      -       +      +
    256A  LYS*     2.9    29.4    -      -       +      +
    258A  ILE*     1.3    73.8    -      -       +      +
    260A  GLU*     1.3    70.1    +      -       +      +
    262A  ARG*     3.1    24.7    +      -       -      +
    263A  GLU*     2.9    29.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 260 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256A  LYS*     3.1    49.9    +      -       +      +
    257A  PHE*     3.4    20.6    -      -       +      +
    259A  VAL*     1.3    84.2    -      -       +      +
    261A  GLU*     1.3    55.5    +      -       -      +
    263A  GLU*     3.2     5.2    +      -       -      +
    264A  ARG*     2.8    36.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 261 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257A  PHE*     3.0    31.2    +      -       +      +
    258A  ILE*     3.4     5.4    -      -       -      +
    260A  GLU*     1.3    82.4    -      -       -      +
    262A  ARG*     1.3    57.1    +      -       -      +
    264A  ARG*     3.3    33.9    +      -       -      +
    265A  MET*     2.9    34.9    +      -       -      +
    318A  ILE*     3.6    12.1    -      -       +      -
    321A  ARG*     3.0    28.3    +      -       -      +
    324A  ASN*     2.8    38.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 262 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  PHE      3.5    15.0    +      -       -      -
    258A  ILE      2.9    10.2    +      -       -      +
    259A  VAL*     3.1    23.4    +      -       -      +
    261A  GLU*     1.3    75.8    -      -       -      +
    263A  GLU*     1.3    90.0    +      -       -      +
    265A  MET*     3.3     5.2    +      -       -      +
    266A  LYS*     2.8    36.7    +      -       +      +
    279A  SER      3.1    21.4    +      -       -      -
    280A  ARG*     3.0    31.3    +      -       -      +
    281A  GLY      2.8    35.6    +      -       -      -
    283A  PHE      3.9     7.9    -      -       -      +
    284A  VAL*     4.0    15.9    -      -       +      +
    318A  ILE*     3.2    25.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 263 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259A  VAL*     2.9    21.3    +      -       +      +
    260A  GLU*     3.8     4.7    -      -       -      +
    262A  ARG*     1.3   111.1    +      -       -      +
    264A  ARG*     1.3    62.5    +      -       -      +
    266A  LYS*     2.8    34.9    +      -       -      +
    267A  SER*     3.0    28.0    +      -       -      -
    270A  ARG*     4.3     4.9    +      -       -      -
    280A  ARG*     4.7     2.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 264 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  GLU      2.8    19.2    +      -       -      +
    261A  GLU*     3.3    40.5    +      -       -      +
    263A  GLU*     1.3    77.0    -      -       -      +
    265A  MET*     1.3    63.8    +      -       -      +
    267A  SER*     3.3     7.1    +      -       -      -
    268A  ALA*     3.2    21.5    +      -       +      +
    321A  ARG*     4.2    10.2    +      -       -      +
    324A  ASN*     4.5     6.1    -      -       -      +
    325A  ASP*     2.5    31.1    +      -       -      -
    328A  LEU*     4.2    21.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 265 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261A  GLU*     2.9    19.6    +      -       +      +
    262A  ARG      3.8     3.4    -      -       -      +
    264A  ARG*     1.3    79.0    -      -       +      +
    266A  LYS*     1.3    58.9    +      -       -      +
    268A  ALA*     3.3     0.9    +      -       -      +
    269A  LEU*     2.9    43.5    +      -       +      +
    284A  VAL*     4.6    14.4    -      -       +      -
    316A  ILE*     4.9     8.1    -      -       +      -
    317A  THR      5.7     0.7    -      -       -      +
    318A  ILE*     4.8    13.9    -      -       -      -
    324A  ASN*     3.5    49.8    -      -       +      +
    327A  ILE*     3.4    35.4    -      -       +      -
    328A  LEU*     4.1    25.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 266 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262A  ARG*     2.8    25.5    +      -       +      +
    263A  GLU*     2.8    38.6    +      -       -      +
    265A  MET*     1.3    78.2    -      -       -      +
    267A  SER*     1.3    59.3    +      -       -      +
    269A  LEU*     3.5     1.7    +      -       -      -
    270A  ARG*     2.9    51.9    +      -       -      +
    276A  ILE*     3.5    14.9    -      -       +      +
    277A  THR      3.9    17.7    -      -       -      +
    278A  ASP*     3.0    23.8    +      -       -      -
    279A  SER*     2.7    34.1    +      -       -      +
    280A  ARG*     4.5     0.8    -      -       -      +
    284A  VAL*     3.5    20.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 267 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263A  GLU      3.0    14.8    +      -       -      -
    264A  ARG*     3.7     8.6    -      -       -      -
    266A  LYS*     1.3    75.9    -      -       -      +
    268A  ALA*     1.3    58.8    +      -       -      +
    270A  ARG*     3.1    20.2    +      -       -      +
    271A  GLU*     2.9    35.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 268 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264A  ARG*     3.2    11.3    +      -       +      +
    265A  MET      3.7     6.7    -      -       -      +
    267A  SER*     1.3    81.4    -      -       -      +
    269A  LEU*     1.3    57.7    +      -       -      +
    271A  GLU*     3.3     7.5    -      -       -      +
    272A  MET*     2.8    37.9    +      -       +      +
    328A  LEU*     3.8    28.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 269 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265A  MET*     2.9    30.9    +      -       +      +
    266A  LYS*     4.0     5.8    -      -       -      +
    268A  ALA*     1.3    72.9    -      -       -      +
    270A  ARG*     1.3    65.8    +      -       -      +
    272A  MET*     3.0    17.5    +      -       -      +
    273A  GLY      3.1     0.2    +      -       -      -
    274A  TYR*     3.0    35.4    +      -       +      +
    276A  ILE*     4.2    19.5    -      -       +      -
    284A  VAL*     4.3    18.8    -      -       +      -
    286A  VAL*     4.3    20.2    -      -       +      -
    316A  ILE*     5.9     0.2    -      -       +      -
    327A  ILE*     6.2     0.4    -      -       +      -
    328A  LEU*     3.6    17.7    -      -       +      -
    331A  LEU*     3.5    33.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 270 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263A  GLU*     4.3     4.9    +      -       -      -
    266A  LYS*     2.9    54.8    +      -       -      +
    267A  SER*     3.1    41.9    +      -       -      +
    269A  LEU*     1.3    73.4    -      -       -      +
    271A  GLU*     1.3    55.8    +      -       -      +
    273A  GLY*     2.8    25.8    +      -       -      -
    274A  TYR      3.8    10.7    +      -       -      +
    276A  ILE*     3.8    19.8    -      -       +      +
    278A  ASP*     5.1     5.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 271 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267A  SER*     2.9    22.4    +      -       -      +
    268A  ALA*     3.3     9.4    -      -       -      +
    270A  ARG*     1.3    77.5    -      -       +      +
    272A  MET*     1.3    62.0    +      -       +      +
    273A  GLY*     3.1     1.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 272 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  ALA*     2.8    27.1    +      -       +      +
    269A  LEU*     3.0    15.4    +      -       -      +
    271A  GLU*     1.3    76.2    -      -       +      +
    273A  GLY*     1.3    58.4    +      -       -      +
    274A  TYR*     3.4    20.3    -      -       +      -
    328A  LEU*     3.9    16.8    -      -       -      +
    331A  LEU*     3.1    15.7    -      -       +      +
    332A  GLU*     3.0    49.1    -      -       +      +
    334A  PHE      5.3     0.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 273 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270A  ARG      2.8    14.4    +      -       -      -
    271A  GLU      3.0     1.9    -      -       -      -
    272A  MET*     1.3    80.0    -      -       -      +
    274A  TYR*     1.3    63.9    +      -       -      +
    275A  ARG*     3.7     1.4    +      -       -      +
----------------------------------------------------------
 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