Contacts of the helix formed by residues 214 - 238 (chain B) in PDB entry 4JYI


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 214 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  SER*     2.7    26.7    +      -       -      -
    206B  SER*     2.7    26.0    +      -       -      +
    211B  VAL*     3.7     7.4    -      -       +      +
    213B  LEU*     1.3    70.3    -      -       -      +
    215B  LEU*     1.3    54.0    +      -       -      +
    216B  GLY*     2.9    17.5    +      -       -      -
    217B  LEU*     3.1    21.3    +      -       +      +
    218B  TRP*     2.7    35.2    +      -       -      +
    292B  ASN*     2.8    20.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 215 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213B  LEU*     3.4    30.9    +      -       +      +
    214B  ASP*     1.3    71.3    +      -       -      +
    216B  GLY*     1.3    57.6    +      -       -      +
    218B  TRP*     3.7     7.5    -      -       +      +
    219B  ASP*     2.9    30.5    +      -       -      +
    394B  GLU      4.9     3.6    -      -       -      +
    396B  PRO*     4.2    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 216 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  SER*     5.3     2.7    -      -       -      -
    214B  ASP*     2.9     8.6    +      -       -      -
    215B  LEU*     1.3    78.2    -      -       -      +
    217B  LEU*     1.3    62.5    +      -       -      +
    219B  ASP*     3.4     7.5    +      -       -      +
    220B  LYS*     3.3    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 217 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203B  THR*     4.0    18.8    -      -       +      -
    205B  SER*     3.8    24.2    +      -       -      +
    206B  SER*     3.4    24.7    -      -       -      +
    214B  ASP*     3.1    24.6    +      -       +      +
    216B  GLY*     1.3    73.8    -      -       -      +
    218B  TRP*     1.3    60.9    +      -       -      +
    220B  LYS*     3.3     8.0    +      -       +      +
    221B  PHE*     2.8    29.6    +      -       -      +
    283B  LEU*     5.8     3.4    -      -       +      -
    285B  LEU*     4.3    14.9    -      -       +      +
    289B  GLN*     3.7    26.7    -      -       +      +
    292B  ASN*     4.0     3.1    -      -       +      -
    293B  ALA*     3.8    16.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 218 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213B  LEU*     4.0    10.8    -      -       +      -
    214B  ASP      2.7    20.7    +      -       -      +
    215B  LEU*     3.7     9.0    -      -       -      +
    217B  LEU*     1.3    71.4    -      -       -      +
    219B  ASP*     1.3    62.2    +      -       +      +
    221B  PHE*     3.8    13.2    -      +       -      -
    222B  SER*     2.8    59.6    +      -       -      -
    293B  ALA      3.5    28.6    +      -       -      +
    391B  LEU*     3.9    17.9    -      -       +      -
    395B  ILE*     3.4    43.0    -      -       +      +
    396B  PRO*     4.7    13.0    +      -       +      +
    399B  MET*     3.6    35.2    -      -       +      -
    400B  PRO*     4.6     3.1    -      -       +      +
    403B  ILE*     5.3     0.2    -      -       +      -
    501B  JYI      3.7    24.9    -      +       -      -
----------------------------------------------------------
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Residues in contact with ASP 219 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215B  LEU      2.9    18.8    +      -       -      +
    216B  GLY*     3.5     8.5    -      -       -      +
    218B  TRP*     1.3    80.4    -      -       +      +
    220B  LYS*     1.3    61.9    +      -       -      +
    222B  SER*     3.0    18.2    +      -       -      -
    223B  GLU*     3.4    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 220 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201B  TYR*     2.6    30.3    +      -       -      -
    216B  GLY      3.3     8.1    +      -       -      +
    217B  LEU*     3.3    10.2    +      -       +      +
    218B  TRP      3.2     0.4    -      -       -      -
    219B  ASP*     1.3    79.7    +      -       -      +
    221B  PHE*     1.3    66.0    +      -       -      +
    223B  GLU*     3.3    27.9    +      -       -      +
    224B  LEU*     3.0    41.2    +      -       +      +
    281B  ASP*     2.6    19.8    +      -       -      -
    283B  LEU*     3.7    24.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 221 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217B  LEU      2.8    17.5    +      -       -      +
    218B  TRP*     3.1    21.3    +      +       -      +
    220B  LYS*     1.3    77.5    -      -       -      +
    222B  SER*     1.3    60.3    +      -       -      +
    224B  LEU*     3.2     8.5    +      -       -      +
    225B  ALA*     2.8    27.0    +      -       +      +
    279B  PHE*     3.9    27.1    -      +       -      -
    283B  LEU*     6.4     0.2    -      -       -      -
    290B  MET*     4.5     2.7    -      -       +      -
    293B  ALA*     3.9    28.3    -      -       +      +
    294B  GLY*     5.1     3.4    -      -       -      -
    295B  PHE*     4.0    24.9    -      +       -      -
    501B  JYI      3.4    81.1    -      +       +      +
----------------------------------------------------------
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Residues in contact with SER 222 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218B  TRP*     2.8    47.7    +      -       -      -
    219B  ASP*     3.0    21.3    +      -       -      -
    221B  PHE*     1.3    77.0    -      -       -      +
    223B  GLU*     1.3    57.8    +      -       -      +
    225B  ALA*     3.5     6.9    +      -       -      +
    226B  THR*     3.0    32.4    +      -       -      -
    400B  PRO*     4.0    19.5    -      -       -      +
    403B  ILE*     4.0     3.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 223 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219B  ASP*     3.4    14.8    +      -       -      +
    220B  LYS*     3.3    30.2    +      -       -      +
    221B  PHE      3.2     0.4    -      -       -      -
    222B  SER*     1.3    80.7    +      -       -      +
    224B  LEU*     1.3    66.8    +      -       +      +
    226B  THR*     3.3     7.5    +      -       -      -
    227B  LYS*     3.1    57.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 224 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220B  LYS*     3.0    45.8    +      -       +      +
    221B  PHE*     3.6     3.8    -      -       -      +
    223B  GLU*     1.3    77.6    -      -       -      +
    225B  ALA*     1.3    61.5    +      -       -      +
    227B  LYS*     3.4    13.9    +      -       +      +
    228B  CYS*     3.0    30.0    +      -       -      +
    279B  PHE*     3.5    35.2    -      -       +      -
    280B  SER*     5.5     1.3    -      -       -      -
    281B  ASP*     3.9    30.5    -      -       +      +
    283B  LEU*     4.0     9.4    -      -       +      -
    501B  JYI      3.8    22.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 225 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    221B  PHE*     2.8    18.1    +      -       +      +
    222B  SER*     3.7     6.7    -      -       -      +
    224B  LEU*     1.3    74.9    -      -       -      +
    226B  THR*     1.3    64.8    +      -       -      +
    228B  CYS*     3.3     2.6    +      -       -      +
    229B  ILE*     2.9    32.1    +      -       +      +
    262B  LEU*     4.6     2.4    -      -       +      +
    403B  ILE*     4.1     7.6    -      -       +      -
    501B  JYI      3.4    49.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 226 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222B  SER      3.0    15.6    +      -       -      -
    223B  GLU*     3.3    11.5    +      -       -      -
    225B  ALA*     1.3    77.0    -      -       -      +
    227B  LYS*     1.3    65.2    +      -       +      +
    229B  ILE*     3.3    11.0    +      -       -      +
    230B  ILE*     3.1    36.0    +      -       +      +
    400B  PRO*     3.6    23.2    -      -       +      +
    402B  LEU*     3.8    18.0    -      -       +      +
    403B  ILE*     3.9     5.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 227 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223B  GLU*     3.1    50.0    +      -       +      +
    224B  LEU*     3.8    14.3    -      -       +      +
    226B  THR*     1.3    79.3    -      -       +      +
    228B  CYS*     1.3    57.6    +      -       -      +
    230B  ILE*     3.4    16.1    +      -       +      +
    231B  LYS*     3.1    33.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 228 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192B  PHE*     4.6     1.6    -      -       -      -
    224B  LEU      3.0    17.9    +      -       -      +
    225B  ALA      3.8     3.6    -      -       -      +
    227B  LYS*     1.3    74.4    -      -       -      +
    229B  ILE*     1.3    61.8    +      -       -      +
    231B  LYS*     3.1    10.0    +      -       -      +
    232B  ILE*     2.8    34.0    +      -       -      +
    262B  LEU*     3.7    17.9    -      -       +      -
    265B  ARG*     3.8    30.3    -      -       -      -
    280B  SER*     5.3     2.0    -      -       -      +
    501B  JYI      3.7    37.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 229 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225B  ALA*     2.9    23.8    +      -       +      +
    226B  THR*     3.6     6.5    -      -       -      +
    228B  CYS*     1.3    74.2    -      -       -      +
    230B  ILE*     1.3    62.3    +      -       -      +
    232B  ILE*     3.1     9.4    +      -       -      +
    233B  VAL*     3.0    23.2    +      -       +      +
    258B  CYS*     3.8    19.1    -      -       -      -
    262B  LEU*     4.1    17.0    -      -       +      -
    402B  LEU*     3.6    22.2    -      -       +      -
    403B  ILE*     3.8    38.6    -      -       +      +
    406B  MET*     3.8    32.8    -      -       +      -
    407B  MET*     5.4     1.8    -      -       +      -
    501B  JYI      5.4     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 230 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226B  THR*     3.1    28.5    +      -       +      +
    227B  LYS*     3.4    17.5    -      -       +      +
    229B  ILE*     1.3    75.4    -      -       -      +
    231B  LYS*     1.3    65.1    +      -       +      +
    233B  VAL*     3.2    10.4    +      -       -      +
    234B  GLU*     3.1    22.6    +      -       +      +
    402B  LEU*     3.6    16.6    -      -       +      -
    636F  LEU*     4.7    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 231 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190B  GLU      4.9     7.5    +      -       -      -
    191B  THR*     3.4    34.3    -      -       -      +
    193B  PRO*     6.2     2.9    -      -       -      -
    227B  LYS*     3.1    17.7    +      -       -      +
    228B  CYS*     3.1    13.2    +      -       -      +
    230B  ILE*     1.3    78.9    -      -       +      +
    232B  ILE*     1.3    57.6    +      -       -      +
    234B  GLU*     3.2    24.4    +      -       -      +
    235B  PHE*     2.8    28.9    +      -       -      +
    265B  ARG*     3.7     7.0    -      -       -      +
    280B  SER*     6.1     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 232 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    228B  CYS*     2.8    26.0    +      -       -      +
    229B  ILE*     3.1    10.5    +      -       -      +
    231B  LYS*     1.3    70.8    -      -       -      +
    233B  VAL*     1.3    61.8    +      -       +      +
    235B  PHE*     3.3    11.2    +      -       +      +
    236B  ALA*     2.9    27.8    +      -       +      +
    254B  LEU*     4.3    14.1    -      -       +      -
    258B  CYS*     4.1    14.8    -      -       -      +
    261B  ILE*     3.7    43.5    -      -       +      -
    262B  LEU*     3.7    32.3    -      -       +      +
    265B  ARG*     3.9    19.3    -      -       -      +
    327B  LEU*     5.9     0.4    -      -       +      -
    406B  MET*     5.7     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 233 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229B  ILE*     3.0    20.7    +      -       +      +
    230B  ILE*     3.4     8.5    -      -       -      +
    232B  ILE*     1.3    77.5    -      -       -      +
    234B  GLU*     1.3    62.0    +      -       -      +
    236B  ALA*     3.2     6.9    +      -       -      +
    237B  LYS*     3.0    30.3    +      -       +      +
    254B  LEU*     4.2     7.2    -      -       +      -
    406B  MET*     4.0    12.1    -      -       +      -
    633F  LEU*     4.0    25.4    -      -       +      -
    636F  LEU*     4.1    28.7    -      -       +      +
    637F  LEU*     4.1    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 234 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190B  GLU      4.3     5.8    -      -       -      +
    191B  THR*     3.5    22.3    -      -       +      +
    230B  ILE*     3.1    14.7    +      -       +      +
    231B  LYS*     3.5    27.3    +      -       -      +
    233B  VAL*     1.3    73.7    -      -       -      +
    235B  PHE*     1.3    64.3    +      -       -      +
    237B  LYS*     3.3    15.4    +      -       -      +
    238B  ARG*     3.3    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 235 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184B  ILE*     4.0     5.2    -      -       +      -
    187B  ALA*     3.6    26.2    -      -       +      -
    188B  HIS*     3.5    31.0    -      -       +      -
    191B  THR*     3.6    14.5    -      -       -      +
    231B  LYS      2.8    14.5    +      -       -      +
    232B  ILE*     3.4    15.5    -      -       +      +
    234B  GLU*     1.3    77.9    -      -       -      +
    236B  ALA*     1.3    66.0    +      -       -      +
    238B  ARG*     3.1    16.8    +      -       -      +
    239B  LEU*     3.5    38.6    +      -       +      +
    261B  ILE*     5.5     4.0    -      -       +      -
    265B  ARG*     3.8    12.1    -      -       -      +
    320B  GLY*     3.5    23.1    -      -       -      -
    323B  SER*     3.9    22.2    -      -       -      -
    324B  ALA      4.2     3.4    -      -       -      -
    327B  LEU*     5.2     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 236 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232B  ILE      2.9    13.6    +      -       -      +
    233B  VAL*     3.5     9.0    -      -       -      +
    234B  GLU      3.2     0.2    -      -       -      -
    235B  PHE*     1.3    78.6    -      -       -      +
    237B  LYS*     1.3    61.4    +      -       -      +
    238B  ARG      3.0     1.4    +      -       -      -
    239B  LEU*     3.1    14.8    +      -       -      +
    242B  PHE*     3.2    32.5    -      -       +      +
    254B  LEU*     3.8    15.0    -      -       +      -
    327B  LEU*     3.4    31.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 237 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233B  VAL*     3.0    25.3    +      -       +      +
    234B  GLU*     3.3     9.8    +      -       -      +
    236B  ALA*     1.3    74.6    -      -       -      +
    238B  ARG*     1.3    60.5    +      -       +      +
    239B  LEU      3.4     4.3    -      -       -      +
    242B  PHE*     4.1     2.7    -      -       +      -
    243B  THR*     3.7    35.7    +      -       +      +
    636F  LEU      3.0    27.3    +      -       -      +
    637F  LEU*     3.6    35.7    +      -       +      -
    638F  GLN      4.3     7.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 238 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183B  LYS*     5.0     9.6    +      -       -      +
    184B  ILE*     5.2     0.3    -      -       -      +
    186B  LYS*     4.0     6.9    -      -       -      +
    187B  ALA*     3.7    36.5    +      -       +      +
    190B  GLU*     2.6    49.0    +      -       -      +
    191B  THR*     4.7     2.4    -      -       -      +
    234B  GLU*     3.3    36.3    +      -       +      +
    235B  PHE      3.1     8.2    +      -       -      +
    236B  ALA      3.0     1.2    -      -       -      -
    237B  LYS*     1.3    80.0    -      -       +      +
    239B  LEU*     1.3    64.8    +      -       -      +
    240B  PRO*     3.4     9.5    -      -       -      +
----------------------------------------------------------
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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