Contacts of the helix formed by residues 141 - 164 (chain K) in PDB entry 1F33


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 ASP 141 (chain K).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133G  ARG*     4.3    12.3    -      -       -      +
     21K  VAL*     4.7     8.8    -      -       +      +
     25K  GLU*     3.5     9.1    +      -       -      +
     29K  THR*     3.8    16.5    +      -       -      +
     83K  ARG*     2.7    36.0    +      -       -      -
     87K  LEU*     4.2     6.9    -      -       +      +
    139K  ALA*     4.4     1.2    -      -       -      +
    140K  LYS*     1.3    76.8    -      -       -      +
    142K  ASP*     1.3    69.5    +      -       -      +
    143K  ASP*     3.9     2.6    +      -       -      +
    144K  THR*     2.5    32.6    +      -       -      +
    145K  ALA*     2.9    21.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 142 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133G  ARG*     4.3     9.4    -      -       +      +
    136G  ILE*     3.8    41.5    -      -       +      +
    137G  GLY*     4.4     9.0    +      -       -      -
    149G  THR*     4.3     5.1    -      -       +      +
    140K  LYS      3.3     8.9    +      -       -      +
    141K  ASP*     1.3    73.5    +      -       -      +
    143K  ASP*     1.3    65.8    +      -       -      +
    145K  ALA*     3.0     9.8    +      -       -      +
    146K  ASP*     2.9    21.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 143 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133G  ARG*     3.9     4.3    -      -       -      -
    136G  ILE*     3.6     6.2    -      -       -      +
    149G  THR*     3.5    26.6    -      -       -      +
    152G  SER*     2.6    34.9    +      -       -      -
    153G  ARG*     3.8    17.2    +      -       -      +
    156G  ASP*     3.3     8.3    -      -       -      +
     83K  ARG*     3.3    35.1    +      -       -      +
    141K  ASP*     3.3     2.5    +      -       -      -
    142K  ASP*     1.3    78.4    -      -       -      +
    144K  THR*     1.3    63.4    +      -       -      +
    146K  ASP*     3.2     5.8    +      -       -      +
    147K  ILE*     3.0    27.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 144 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29K  THR*     3.1    22.3    -      -       +      +
     32K  LEU*     5.1     4.0    -      -       +      -
     33K  LEU*     3.5    30.1    -      -       +      -
     83K  ARG*     3.7     8.2    +      -       -      +
    139K  ALA*     4.3     8.1    -      -       +      -
    141K  ASP*     2.5    34.0    +      -       -      -
    143K  ASP*     1.3    74.1    -      -       -      +
    145K  ALA*     1.3    67.7    +      -       -      +
    147K  ILE*     3.2    10.8    +      -       -      +
    148K  LEU*     2.9    35.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 145 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136K  ILE*     4.0    23.6    -      -       +      +
    139K  ALA*     4.0    16.3    -      -       +      +
    141K  ASP      2.9    11.7    +      -       -      +
    142K  ASP*     3.3    12.1    -      -       -      +
    144K  THR*     1.3    76.3    -      -       -      +
    146K  ASP*     1.3    53.7    +      -       -      +
    148K  LEU*     3.3     5.6    +      -       -      +
    149K  THR*     2.7    38.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 146 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146G  ASP*     4.5     3.5    -      -       -      +
    149G  THR*     3.8    24.0    -      -       +      +
    153G  ARG*     2.8    20.4    +      -       -      +
    607G  TRS      2.8    47.0    +      -       -      -
    146I  ASP*     4.3     5.0    -      -       -      +
    142K  ASP      2.9    10.8    +      -       -      +
    143K  ASP      3.3    10.1    -      -       -      +
    145K  ALA*     1.3    77.1    -      -       -      +
    147K  ILE*     1.3    63.5    -      -       -      +
    149K  THR*     3.0     9.5    +      -       -      -
    150K  ALA*     2.9    22.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 147 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153G  ARG*     3.5    35.0    -      -       +      +
     33K  LEU*     5.2     2.0    -      -       +      -
     76K  HIS*     4.7     3.6    +      -       -      +
     79K  THR*     3.8    23.3    -      -       +      -
     80K  MET*     3.6    30.5    -      -       +      -
     83K  ARG*     3.6    41.5    -      -       +      -
    143K  ASP      3.0    18.3    +      -       -      +
    144K  THR*     3.4     8.7    -      -       +      +
    146K  ASP*     1.3    76.1    -      -       -      +
    148K  LEU*     1.3    63.9    +      -       +      +
    150K  ALA*     3.4     4.7    +      -       -      +
    151K  ALA*     3.1    20.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 148 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32K  LEU*     4.3     7.9    -      -       +      -
     33K  LEU*     4.6     7.6    -      -       +      -
     36K  GLN*     3.9    11.7    -      -       +      -
     80K  MET*     3.8    27.6    -      -       -      -
    132K  VAL*     3.9    20.6    -      -       +      +
    135K  ALA*     3.8    34.3    -      -       +      +
    136K  ILE*     3.9    12.1    -      -       +      +
    139K  ALA*     4.1     7.2    -      -       +      -
    144K  THR*     2.9    37.1    +      -       +      +
    145K  ALA      3.7     3.6    -      -       -      +
    147K  ILE*     1.3    72.3    -      -       -      +
    149K  THR*     1.3    57.3    +      -       -      +
    151K  ALA*     3.3     4.4    +      -       -      +
    152K  SER*     2.7    35.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 149 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607G  TRS      6.3     0.2    -      -       -      -
    142I  ASP*     4.3     4.8    -      -       +      +
    143I  ASP*     3.4    22.0    -      -       -      +
    146I  ASP*     3.7    35.9    -      -       +      +
    136K  ILE*     3.5    24.8    -      -       +      +
    145K  ALA*     2.7    24.3    +      -       -      +
    146K  ASP*     3.0    11.9    +      -       -      -
    148K  LEU*     1.3    74.0    -      -       -      +
    150K  ALA*     1.3    61.1    +      -       -      +
    152K  SER      3.2     0.3    +      -       -      -
    153K  ARG*     2.8    30.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 150 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153G  ARG*     4.8    11.7    -      -       -      +
    607G  TRS      4.6    17.0    +      -       -      +
    146I  ASP*     5.4     0.7    -      -       -      -
     76K  HIS*     3.4    19.0    -      -       +      +
    146K  ASP      2.9    11.4    +      -       -      +
    147K  ILE*     3.6    10.3    -      -       -      +
    149K  THR*     1.3    78.5    -      -       -      +
    151K  ALA*     1.3    63.3    +      -       -      +
    153K  ARG*     3.4     8.3    -      -       -      +
    154K  ASP*     3.4    15.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 151 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40K  PHE*     3.9    21.8    -      -       +      -
     76K  HIS*     3.4    32.9    -      -       +      +
     80K  MET*     5.0     5.4    -      -       -      -
    132K  VAL*     4.7     2.5    -      -       +      -
    147K  ILE*     3.1    15.6    +      -       +      +
    148K  LEU*     3.7     7.9    -      -       -      +
    150K  ALA*     1.3    74.3    -      -       -      +
    152K  SER*     1.3    65.1    +      -       -      +
    154K  ASP*     3.1     4.3    +      -       -      +
    155K  LEU*     2.9    28.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 152 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143I  ASP*     2.6    32.3    +      -       -      -
    132K  VAL*     4.0    20.7    -      -       -      +
    133K  ARG*     3.6    20.7    -      -       -      +
    136K  ILE*     3.7     9.2    -      -       -      -
    148K  LEU      2.7    21.7    +      -       -      -
    151K  ALA*     1.3    73.2    -      -       -      +
    153K  ARG*     1.3    65.2    +      -       -      +
    155K  LEU*     3.1     2.3    +      -       -      +
    156K  ASP*     2.9    29.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 153 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607G  TRS      4.1     9.1    +      -       -      -
     79I  THR*     3.6    18.6    -      -       -      +
     83I  ARG*     5.2     3.4    -      -       -      +
     86I  GLN*     4.3     4.4    -      -       -      +
    143I  ASP*     3.7    27.3    +      -       +      +
    146I  ASP*     3.0    27.3    +      -       -      -
    147I  ILE*     3.5    42.8    -      -       +      +
    150I  ALA*     4.9     8.7    -      -       -      +
    149K  THR      2.8    15.9    +      -       -      +
    150K  ALA*     3.4     9.5    -      -       -      +
    152K  SER*     1.3    78.4    +      -       -      +
    154K  ASP*     1.3    63.2    +      -       -      +
    156K  ASP*     3.7     4.1    +      -       -      +
    157K  LYS*     3.3    18.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 154 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72K  ALA*     4.3     8.3    -      -       -      +
     76K  HIS*     2.7    31.6    +      -       +      +
    150K  ALA      3.4     4.2    +      -       -      -
    151K  ALA      3.1     8.9    +      -       -      +
    153K  ARG*     1.3    79.9    -      -       -      +
    155K  LEU*     1.3    61.3    +      -       +      +
    157K  LYS*     3.0    12.2    +      -       -      +
    158K  PHE*     2.8    56.8    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 155 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40K  PHE*     3.3    38.1    -      -       +      -
     43K  LEU*     3.8    19.7    -      -       +      -
     73K  LEU*     4.2    15.0    -      -       +      -
     76K  HIS*     5.4     1.1    -      -       +      -
    125K  TYR*     4.2    11.5    -      -       +      +
    128K  VAL*     3.6    27.1    -      -       +      -
    129K  ALA*     3.9    25.2    -      -       +      +
    132K  VAL*     4.8     2.0    -      -       +      -
    151K  ALA*     2.9    24.9    +      -       -      +
    152K  SER*     3.1     5.8    +      -       -      +
    154K  ASP*     1.3    77.8    -      -       +      +
    156K  ASP*     1.3    58.0    +      -       -      +
    158K  PHE*     3.2     7.7    +      -       +      +
    159K  LEU*     2.8    30.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 156 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19I  ASN*     3.4    16.7    +      -       -      +
     83I  ARG*     2.8    40.4    +      -       -      +
     86I  GLN*     3.7     9.2    -      -       +      +
    143I  ASP*     3.4     5.4    -      -       -      +
    129K  ALA*     3.7    11.1    -      -       -      +
    133K  ARG*     2.5    34.9    +      -       -      -
    152K  SER*     2.9    19.0    +      -       -      +
    153K  ARG      4.0     1.1    -      -       -      +
    155K  LEU*     1.3    75.9    -      -       -      +
    157K  LYS*     1.3    63.2    +      -       -      +
    159K  LEU*     3.7     6.7    -      -       -      +
    160K  TRP*     3.1    23.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 157 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82I  GLU*     4.0    21.1    +      -       -      +
     86I  GLN*     3.7    24.4    +      -       -      +
    153K  ARG      3.3    12.2    +      -       -      +
    154K  ASP*     3.0    18.0    +      -       -      +
    156K  ASP*     1.3    80.3    -      -       -      +
    158K  PHE*     1.3    72.7    +      -       +      +
    160K  TRP*     3.2    10.3    +      -       +      +
    161K  PHE*     2.8    57.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 158 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68K  GLY      5.6     0.2    -      -       -      -
     69K  PHE*     3.4    54.3    -      +       +      -
     72K  ALA*     3.5    33.4    -      -       +      -
     73K  LEU*     4.1    14.1    -      -       +      -
     76K  HIS*     5.7     0.2    -      +       -      -
    125K  TYR*     3.7    24.7    -      +       +      -
    154K  ASP*     2.8    43.9    +      -       +      +
    155K  LEU*     3.7     7.4    -      -       -      +
    157K  LYS*     1.3    89.7    -      -       +      +
    159K  LEU*     1.3    60.6    +      -       -      +
    161K  PHE*     3.0     2.3    +      -       -      +
    162K  ILE*     2.8    35.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 159 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17I  THR*     4.4     1.8    -      -       -      +
     18I  ARG*     4.1     1.1    -      -       +      -
     19I  ASN*     3.7    40.4    -      -       +      +
    122K  ALA*     3.5    31.2    -      -       -      +
    125K  TYR*     4.2    12.0    -      -       +      -
    126K  ALA*     3.9    22.4    -      -       +      +
    129K  ALA*     4.4    10.5    -      -       +      -
    130K  ASN*     5.2     0.2    -      -       -      +
    155K  LEU      2.8    20.5    +      -       -      +
    156K  ASP*     3.7     5.8    -      -       -      +
    158K  PHE*     1.3    73.4    -      -       -      +
    160K  TRP*     1.3    59.3    +      -       -      +
    162K  ILE*     3.2     4.0    +      -       -      +
    163K  GLU*     2.9    56.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 160 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17I  THR*     5.7     1.1    -      -       -      +
     82I  GLU*     3.9    32.8    -      -       +      -
     85I  VAL*     3.2    26.0    -      -       +      +
     86I  GLN*     3.5    42.4    -      -       +      +
     52J  TRP*     3.8    21.7    +      -       -      -
     54J  MET      5.2     2.4    +      -       -      -
     55J  ARG*     3.9    18.8    -      -       -      +
     59J  PHE*     4.3    11.6    -      +       -      -
     63J  HIS*     4.1    12.8    -      +       -      -
    156K  ASP      3.1    11.0    +      -       -      +
    157K  LYS*     3.3    10.8    -      -       +      +
    159K  LEU*     1.3    81.6    -      -       -      +
    161K  PHE*     1.3    88.3    +      +       -      +
    163K  GLU*     3.8     8.2    -      -       -      +
    164K  SER*     2.6    64.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 161 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82I  GLU*     5.7     0.7    -      -       -      -
     59J  PHE*     3.7    19.1    -      +       -      -
     60J  ILE*     3.6    20.9    -      -       +      -
     63J  HIS*     3.9    23.6    -      +       -      -
     64J  GLU*     5.1     3.1    -      -       -      -
     65K  MET*     3.9     6.5    -      -       +      -
     69K  PHE*     3.6    30.1    -      +       +      -
    157K  LYS*     2.8    39.2    +      -       +      +
    158K  PHE      3.0     7.6    +      -       -      +
    160K  TRP*     1.3   113.5    -      +       -      +
    162K  ILE*     1.3    59.5    +      -       -      +
    164K  SER*     3.6     2.1    +      -       -      -
    165K  ASN*     2.7    34.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 162 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65K  MET*     4.4     9.9    -      -       +      -
     66K  LEU*     4.8     4.9    -      -       +      -
     69K  PHE*     3.7    15.3    -      -       +      -
    118K  LEU*     3.3    41.0    -      -       +      +
    121K  LEU*     4.1    10.1    -      -       +      -
    122K  ALA*     3.9    12.3    -      -       +      +
    125K  TYR*     3.5    53.8    -      -       +      -
    158K  PHE      2.8    20.7    +      -       -      +
    159K  LEU*     3.6     4.3    -      -       -      +
    161K  PHE*     1.3    71.2    -      -       -      +
    163K  GLU*     1.3    66.7    +      -       -      +
    165K  ASN*     3.0    18.2    +      -       -      +
    166K  ILE*     3.6     7.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 163 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16I  TYR*     4.2     3.5    -      -       -      +
     17I  THR*     2.8    30.1    +      -       -      -
     18I  ARG*     2.7    62.5    +      -       -      +
     55J  ARG*     4.6    13.0    +      -       -      +
    122K  ALA*     4.3     4.3    -      -       +      -
    159K  LEU*     2.9    31.3    +      -       +      +
    160K  TRP*     3.9     6.9    -      -       -      +
    162K  ILE*     1.3    75.5    -      -       -      +
    164K  SER*     1.3    58.2    +      -       -      +
    166K  ILE*     2.8    37.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 164 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54J  MET      4.4     0.2    +      -       -      -
     55J  ARG*     3.6    22.4    +      -       -      +
     56J  GLY      2.8    26.4    +      -       -      -
     59J  PHE*     3.2    40.8    -      -       -      +
    160K  TRP*     2.6    46.7    +      -       -      -
    161K  PHE      3.9     0.7    -      -       -      -
    162K  ILE      3.2     0.2    -      -       -      -
    163K  GLU*     1.3    74.8    -      -       -      +
    165K  ASN*     1.3    56.4    +      -       -      +
    166K  ILE      3.4     0.7    -      -       -      -
----------------------------------------------------------
 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