Contacts of the helix formed by residues 102 - 124 (chain F) in PDB entry 2OCP


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 102 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98F  MET*     2.9    13.3    +      -       -      +
     99F  MET      3.7     2.5    -      -       -      -
    101F  ARG*     1.3    86.9    -      -       +      +
    103F  PRO*     1.3    60.5    -      -       -      +
    104F  ALA      3.2     2.2    -      -       -      -
    105F  ARG*     2.8    35.9    +      -       +      +
    106F  TRP*     2.9    28.2    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 103 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99F  MET*     3.1    21.0    -      -       +      +
    100F  TYR      3.6    10.8    -      -       -      +
    101F  ARG      3.5     8.3    -      -       -      +
    102F  GLU*     1.3    88.2    -      -       -      +
    104F  ALA*     1.3    63.9    +      -       +      +
    107F  SER*     2.4    38.5    +      -       -      +
    155F  LEU*     5.3     0.4    -      -       +      -
    160F  SER*     3.2    22.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 104 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105E  ARG*     3.2    19.6    +      -       -      -
    102F  GLU      3.2     1.4    +      -       -      -
    103F  PRO*     1.3    83.2    -      -       +      +
    105F  ARG*     1.3    57.6    +      -       +      +
    107F  SER      4.9     0.2    -      -       -      -
    159F  GLY      4.8     9.4    -      -       -      +
    160F  SER*     3.5    18.3    -      -       -      +
    165F  GLU*     4.6     3.1    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 105 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104E  ALA      3.1    24.7    +      -       -      -
    105E  ARG*     3.3    48.4    +      -       -      +
    165E  GLU*     3.3    14.6    +      -       -      -
    102F  GLU*     2.8    27.8    +      -       +      +
    104F  ALA*     1.3    82.8    -      -       -      +
    106F  TRP*     1.3   116.6    +      -       +      +
    107F  SER      3.8     0.7    -      -       -      -
    108F  TYR*     5.4     1.0    +      -       -      +
    109F  THR*     4.3     5.9    +      -       -      -
    165F  GLU*     5.1     2.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 106 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162E  SER*     4.1    12.6    -      -       -      -
    164E  ILE*     5.4     5.8    -      -       +      -
    165E  GLU*     3.8    22.4    -      -       +      -
     95F  LEU*     4.5     7.6    -      -       +      -
     98F  MET*     3.8    43.7    -      -       +      +
     99F  MET*     3.9    23.1    -      -       -      +
    102F  GLU*     2.9    21.9    +      -       +      -
    105F  ARG*     1.3   132.6    -      -       +      +
    107F  SER*     1.3    59.7    +      -       -      +
    108F  TYR      3.4     2.0    -      -       -      -
    109F  THR*     3.4    35.4    +      -       +      -
    110F  PHE*     2.8    31.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 107 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99F  MET*     3.9     7.7    -      -       -      +
    103F  PRO*     2.4    35.1    +      -       -      +
    104F  ALA      4.9     0.2    -      -       -      -
    105F  ARG      3.8     0.6    -      -       -      -
    106F  TRP*     1.3    75.5    -      -       -      +
    108F  TYR*     1.3    65.2    +      -       -      +
    110F  PHE*     3.1     7.5    +      -       -      +
    111F  GLN*     2.9    26.7    +      -       -      +
    155F  LEU*     3.8    23.0    -      -       -      +
    160F  SER*     3.4    23.4    -      -       -      -
    161F  LEU*     3.9     6.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 108 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  TYR*     4.0    13.0    -      +       -      -
    109E  THR*     3.7    25.6    -      -       +      -
    112E  THR*     2.6    33.0    +      -       -      -
    105F  ARG      5.9     0.9    -      -       -      +
    106F  TRP      3.4     0.6    -      -       -      -
    107F  SER*     1.3    77.4    -      -       -      +
    109F  THR*     1.3    70.7    +      -       -      +
    111F  GLN*     3.0    14.7    +      -       +      +
    112F  THR*     3.0    39.2    +      -       +      +
    160F  SER      5.2     0.2    +      -       -      -
    161F  LEU*     3.2    15.2    -      -       +      +
    165F  GLU*     3.3    58.3    +      -       +      +
    168F  ILE*     3.0    16.7    -      -       +      +
    169F  TYR*     3.9    20.9    -      +       +      -
    172F  TRP*     4.3     4.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 109 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  TYR*     3.7    27.2    -      -       +      -
    164E  ILE*     4.6     3.4    -      -       +      -
    165E  GLU*     4.5     3.6    +      -       +      -
    168E  ILE*     3.4    26.7    -      -       +      -
     95F  LEU*     4.4     7.4    -      -       +      -
    105F  ARG*     4.3     6.5    +      -       -      -
    106F  TRP*     3.4    43.0    +      -       +      +
    107F  SER      3.3     0.4    -      -       -      -
    108F  TYR*     1.3    79.4    -      -       -      +
    110F  PHE*     1.3    61.6    +      -       -      +
    112F  THR*     2.8    24.9    +      -       -      -
    113F  PHE*     3.2     7.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 110 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75F  TRP*     4.1    38.4    -      +       +      -
     95F  LEU*     3.8    36.1    -      -       +      -
     96F  LEU*     3.7    31.6    -      -       +      -
     99F  MET*     4.0    15.9    -      -       +      -
    106F  TRP      2.8    21.4    +      -       -      +
    107F  SER*     3.1     4.9    +      -       -      +
    109F  THR*     1.3    73.7    -      -       -      +
    111F  GLN*     1.3    65.8    +      -       -      +
    113F  PHE*     2.9    14.1    +      +       -      +
    114F  SER*     2.9    21.2    +      -       -      -
    301F  DTP      3.3    51.8    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 111 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107F  SER      2.9    11.7    +      -       -      +
    108F  TYR*     3.5    11.7    -      -       +      +
    110F  PHE*     1.3    76.8    -      -       -      +
    112F  THR*     1.3    57.9    +      -       -      +
    114F  SER*     3.1     8.3    +      -       -      -
    115F  PHE*     2.8    33.9    +      -       -      +
    147F  ASP*     3.4    10.5    -      -       -      +
    151F  PHE*     3.8     0.2    -      -       -      +
    152F  ALA*     3.7    32.5    -      -       +      -
    155F  LEU*     3.1    26.8    -      -       +      +
    161F  LEU*     5.1     4.3    -      -       +      -
    169F  TYR*     3.7    18.6    -      -       +      -
    301F  DTP      2.8    49.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 112 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108E  TYR*     2.6    27.6    +      -       +      +
    112E  THR*     5.2     2.0    -      -       +      -
    168E  ILE*     3.6     2.8    -      -       -      +
    172E  TRP*     3.0    31.2    +      -       -      +
    108F  TYR*     3.0    52.6    +      -       +      +
    109F  THR      2.8    13.5    +      -       -      -
    111F  GLN*     1.3    77.0    -      -       +      +
    113F  PHE*     1.3    60.3    +      -       -      +
    115F  PHE*     4.6     4.5    -      -       -      -
    116F  LEU*     3.3    13.2    +      -       -      +
    169F  TYR*     5.2     5.6    -      -       +      -
    172F  TRP*     6.3     1.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 113 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167E  HIS*     4.6    17.7    -      +       -      -
    168E  ILE*     3.7    30.3    -      -       +      -
    171E  ASP*     5.0    11.9    -      -       -      -
     71F  PRO*     5.8     0.4    -      -       +      -
     74F  THR*     3.9    26.5    -      -       +      -
     75F  TRP*     3.1    38.6    -      +       -      -
     78F  ILE*     4.5    11.4    -      -       +      -
     95F  LEU*     3.9    25.1    -      -       +      -
    109F  THR      3.2     4.0    +      -       -      +
    110F  PHE*     2.9     9.2    +      +       -      +
    112F  THR*     1.3    81.6    +      -       -      +
    114F  SER*     1.3    63.9    +      -       -      +
    116F  LEU*     3.7     8.4    +      -       +      +
    117F  SER*     3.2    27.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 114 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75F  TRP*     4.3    17.4    -      -       -      +
    110F  PHE*     2.9    28.3    +      -       -      -
    111F  GLN*     3.1    19.2    +      -       -      -
    113F  PHE*     1.3    75.3    -      -       -      +
    115F  PHE*     1.3    61.8    +      -       -      +
    117F  SER*     3.3     5.7    +      -       -      -
    118F  ARG*     2.9    44.4    +      -       -      +
    147F  ASP*     2.5    24.1    +      -       -      -
    301F  DTP      3.7     0.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 115 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172E  TRP*     3.6    33.0    -      +       -      -
    111F  GLN      2.8    18.6    +      -       -      +
    112F  THR*     4.2     2.9    -      -       -      +
    114F  SER*     1.3    78.2    +      -       -      +
    116F  LEU*     1.3    61.7    +      -       -      +
    118F  ARG*     3.3     1.9    +      -       -      +
    119F  LEU*     2.9    32.1    +      -       +      +
    144F  VAL*     3.7    29.6    -      -       +      -
    147F  ASP*     3.5    19.7    -      -       +      +
    169F  TYR*     4.3     9.6    -      +       +      -
    172F  TRP*     4.6     4.0    -      -       +      -
    173F  HIS*     3.3    56.8    -      +       -      -
    176F  LEU*     4.2    11.4    -      -       +      -
    177F  LEU*     4.2    13.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 116 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171E  ASP*     3.1    40.2    -      -       +      +
    172E  TRP*     3.5    47.5    -      -       +      +
    175E  PHE*     3.5    35.4    -      -       +      -
    112F  THR      3.3    16.5    +      -       -      +
    113F  PHE*     3.9    11.7    -      -       +      +
    115F  PHE*     1.3    79.1    -      -       -      +
    117F  SER*     1.3    59.7    +      -       -      +
    119F  LEU*     3.2     5.0    +      -       +      +
    120F  LYS*     2.8    37.8    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 117 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70F  GLU*     5.2     0.2    +      -       -      -
     71F  PRO*     3.0    37.2    -      -       -      +
     75F  TRP*     4.7     5.2    -      -       -      -
    113F  PHE*     3.2    22.3    +      -       -      -
    114F  SER*     3.5     7.0    -      -       -      -
    115F  PHE      3.2     0.2    -      -       -      -
    116F  LEU*     1.3    81.8    -      -       -      +
    118F  ARG*     1.3    64.5    +      -       -      +
    120F  LYS*     3.2    10.9    +      -       -      +
    121F  VAL*     3.2    22.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 118 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70F  GLU*     3.0    40.7    +      -       -      +
     71F  PRO*     6.4     0.2    -      -       -      -
     75F  TRP*     3.9    10.7    -      -       +      -
    114F  SER*     2.9    24.6    +      -       -      +
    115F  PHE*     3.8     3.6    -      -       -      +
    117F  SER*     1.3    74.0    -      -       -      +
    119F  LEU*     1.3    59.1    +      -       -      +
    121F  VAL*     3.0    27.2    -      -       +      +
    122F  GLN*     3.2    14.0    +      -       -      +
    142F  ARG*     3.8    20.5    -      -       -      +
    143F  SER*     3.4    23.6    +      -       -      +
    144F  VAL*     3.9    17.5    -      -       +      +
    147F  ASP*     2.8    38.7    +      -       -      +
    151F  PHE*     4.8     0.6    -      -       -      -
    301F  DTP      2.8    48.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 119 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172E  TRP*     5.1     2.9    -      -       +      -
    175E  PHE*     4.2    13.0    -      -       +      -
    115F  PHE*     2.9    26.4    +      -       +      +
    116F  LEU*     3.6     4.9    -      -       +      +
    118F  ARG*     1.3    73.8    -      -       -      +
    120F  LYS*     1.3    67.1    +      -       -      +
    122F  GLN*     3.2     2.5    +      -       -      -
    123F  LEU*     3.1    39.7    +      -       +      +
    144F  VAL*     3.6    16.3    -      -       +      +
    176F  LEU*     4.0    23.6    -      -       +      -
    177F  LEU*     4.2     9.9    -      -       +      -
    180F  PHE*     4.0    28.3    -      -       +      -
    184F  ILE*     3.9    27.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 120 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171E  ASP*     2.7    33.9    +      -       -      -
    175E  PHE*     3.6    53.1    -      -       +      +
    116F  LEU*     2.8    25.1    +      -       +      +
    117F  SER*     3.5     9.0    -      -       -      +
    119F  LEU*     1.3    76.0    -      -       -      +
    121F  VAL*     1.3    64.1    +      -       -      +
    123F  LEU*     2.9    13.9    +      -       -      +
    124F  GLU*     3.1    20.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 121 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68F  ALA*     3.6    29.4    -      -       +      -
     69F  THR*     4.8    11.7    -      -       +      +
     70F  GLU*     6.1     0.9    -      -       -      +
     71F  PRO*     6.4     2.9    -      -       +      -
    117F  SER      3.2     7.0    +      -       -      +
    118F  ARG*     3.0    23.8    -      -       +      +
    120F  LYS*     1.3    79.4    -      -       -      +
    122F  GLN*     1.3    66.8    +      -       +      +
    123F  LEU      3.4     0.3    +      -       -      -
    124F  GLU*     3.5    34.1    +      -       -      +
    138F  GLN*     5.6     1.9    +      -       -      -
    140F  PHE*     3.6    22.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 122 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40F  ARG*     2.9    35.2    +      -       -      +
    118F  ARG*     3.5    16.2    -      -       -      +
    119F  LEU*     3.2     6.6    +      -       -      +
    120F  LYS      3.2     0.8    -      -       -      -
    121F  VAL*     1.3    81.6    -      -       -      +
    123F  LEU*     1.3    60.4    +      -       -      +
    124F  GLU      4.3     2.7    -      -       -      +
    140F  PHE*     3.8    24.5    -      -       +      -
    142F  ARG      4.9     0.7    -      -       -      +
    143F  SER*     4.1     6.6    -      -       -      -
    144F  VAL*     3.4    32.9    +      -       -      +
    145F  TYR*     4.5     3.6    -      -       -      -
    183F  ARG      3.3     8.8    -      -       -      +
    184F  ILE*     3.2    34.7    +      -       +      +
    186F  LEU*     3.8    25.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 123 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175E  PHE*     3.7    28.0    -      -       +      -
    179E  GLU*     4.3     9.2    -      -       -      +
    119F  LEU*     3.1    17.2    +      -       +      +
    120F  LYS*     2.9     9.1    +      -       -      +
    122F  GLN*     1.3    77.3    -      -       -      +
    124F  GLU*     1.3    67.5    +      -       -      +
    125F  PRO*     4.1     3.8    -      -       -      +
    180F  PHE*     3.9    40.6    -      -       +      -
    183F  ARG*     3.7    48.7    +      -       +      +
    184F  ILE*     3.6    27.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 124 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40F  ARG*     5.5     1.2    +      -       -      -
    120F  LYS*     3.1    15.3    +      -       +      +
    121F  VAL*     3.5    38.1    +      -       -      +
    122F  GLN      4.3     4.2    -      -       -      +
    123F  LEU*     1.3    82.0    -      -       -      +
    125F  PRO*     1.3    77.5    -      -       +      +
    126F  PHE*     4.0     5.9    +      -       -      -
    138F  GLN*     5.4     2.9    +      -       -      +
----------------------------------------------------------
 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