Contacts of the helix formed by residues 889 - 911 (chain A) in PDB entry 4D86


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 889 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    886A  SER*     3.0    25.1    +      -       -      +
    888A  TYR*     1.3    87.7    -      -       +      +
    890A  ALA*     1.3    62.7    +      -       -      +
    891A  PRO*     3.4     4.5    -      -       -      -
    892A  ARG*     3.2    18.4    +      -       +      +
    893A  CYS*     3.0    26.2    +      -       -      -
   1158A  LYS*     2.7    40.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 890 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885A  TRP*     3.7    27.5    -      -       +      -
    886A  SER      3.3     6.4    +      -       -      -
    887A  GLY*     3.7    11.9    +      -       -      +
    888A  TYR      3.7     2.0    -      -       -      -
    889A  GLU*     1.3    76.1    -      -       -      +
    891A  PRO*     1.3    69.6    -      -       +      +
    893A  CYS*     3.1     3.3    +      -       -      +
    894A  VAL*     2.9    34.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 891 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    888A  TYR      5.5     1.1    -      -       -      +
    889A  GLU*     3.7     3.6    -      -       -      -
    890A  ALA*     1.3    95.3    -      -       +      +
    892A  ARG*     1.3    54.9    +      -       -      +
    894A  VAL*     3.4     9.4    +      -       +      +
    895A  TYR*     3.0    26.7    +      -       -      +
   1189A  ARG*     4.3    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 892 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    889A  GLU*     3.2    22.4    +      -       +      +
    890A  ALA      3.1     1.0    -      -       -      -
    891A  PRO*     1.3    76.5    -      -       -      +
    893A  CYS*     1.3    61.8    +      -       -      +
    895A  TYR*     3.3    20.3    +      -       -      +
    896A  LEU*     2.8    58.9    +      -       +      +
    899A  ARG*     5.3     0.4    -      -       -      +
   1109A  GLU*     3.4    29.5    +      -       -      -
   1147A  LEU      5.0     0.8    +      -       -      -
   1150A  SER*     2.8    48.0    +      -       -      -
   1151A  GLU*     4.2     7.4    +      -       -      +
   1154A  LYS*     3.8    46.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 893 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    883A  PRO*     3.5    20.5    -      -       +      +
    884A  ARG      3.8    14.4    -      -       -      -
    885A  TRP*     3.8    19.5    -      -       +      -
    886A  SER*     3.6    30.1    -      -       -      -
    889A  GLU*     3.0    23.1    +      -       -      -
    890A  ALA      3.5     7.4    -      -       -      +
    892A  ARG*     1.3    74.3    -      -       -      +
    894A  VAL*     1.3    65.8    +      -       -      +
    896A  LEU*     3.2     3.0    +      -       -      -
    897A  LEU*     2.9    23.6    +      -       -      +
    928A  PHE*     4.0     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 894 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885A  TRP*     5.0     3.1    -      -       +      -
    890A  ALA*     2.9    21.6    +      -       +      +
    891A  PRO*     3.6    10.5    -      -       +      +
    893A  CYS*     1.3    76.8    -      -       -      +
    895A  TYR*     1.3    64.6    +      -       -      +
    897A  LEU      3.3     0.2    +      -       -      -
    898A  ARG*     3.0    27.9    +      -       +      +
    928A  PHE*     4.1    20.0    -      -       +      -
    932A  ARG*     3.5    31.9    -      -       -      +
    936A  THR*     3.6    21.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 895 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    891A  PRO      3.0    15.6    +      -       -      +
    892A  ARG*     3.3    26.2    +      -       -      +
    894A  VAL*     1.3    77.8    -      -       -      +
    896A  LEU*     1.3    73.3    +      -       +      +
    898A  ARG*     3.6    15.7    -      -       -      +
    899A  ARG*     2.9    76.8    +      -       +      +
    902A  GLN*     6.0     0.7    -      -       -      -
   1109A  GLU*     4.4     0.2    -      -       -      -
   1143A  ILE      4.8     1.2    +      -       -      -
   1146A  GLU*     3.4    34.3    -      -       +      -
   1147A  LEU*     3.2    25.7    -      -       +      +
   1150A  SER*     3.5    27.1    -      -       -      +
   1185A  GLU*     5.8     0.7    -      -       -      -
   1189A  ARG*     4.4     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 896 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    861A  PRO*     3.7    37.5    -      -       +      +
    862A  GLY*     3.3    15.5    -      -       -      +
    883A  PRO*     4.0    21.5    -      -       +      -
    892A  ARG*     2.8    50.5    +      -       +      +
    893A  CYS*     3.2     5.1    +      -       -      +
    895A  TYR*     1.3    88.6    -      -       +      +
    897A  LEU*     1.3    60.1    +      -       -      +
    899A  ARG*     3.4    18.2    +      -       -      +
    900A  ALA*     3.0    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 897 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    882A  GLY*     4.9     0.7    -      -       -      -
    883A  PRO*     3.7    12.9    -      -       +      +
    893A  CYS      2.9    16.1    +      -       -      +
    894A  VAL      3.8     2.9    -      -       -      +
    896A  LEU*     1.3    72.2    -      -       -      +
    898A  ARG*     1.3    66.5    +      -       -      +
    900A  ALA*     3.3     4.4    +      -       +      +
    901A  VAL*     3.1    28.1    +      -       +      +
    921A  ILE*     3.6    39.0    -      -       +      +
    922A  SER*     4.4     4.3    -      -       -      +
    928A  PHE*     3.5    30.1    -      -       +      -
    933A  CYS*     3.7    34.5    -      -       -      +
    936A  THR*     3.8    10.3    -      -       +      -
    937A  ILE*     4.3    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 898 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    894A  VAL*     3.0    22.2    +      -       +      +
    895A  TYR*     3.6    16.9    +      -       -      +
    897A  LEU*     1.3    78.4    -      -       -      +
    899A  ARG*     1.3    57.0    +      -       -      +
    901A  VAL*     3.2     5.4    +      -       -      +
    902A  GLN*     2.8    50.3    +      -       -      +
    936A  THR*     3.7    17.6    -      -       +      +
    939A  SER*     5.1     5.0    +      -       -      -
    940A  ALA*     3.7    28.1    -      -       +      +
    943A  GLU*     3.0    28.3    +      -       -      +
   1146A  GLU*     3.8    20.6    +      -       -      +
   1185A  GLU*     3.5    12.7    +      -       -      -
   1188A  ARG*     3.5    29.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 899 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    860A  LEU*     5.6     1.8    -      -       -      +
    861A  PRO      3.2    25.1    +      -       -      -
    862A  GLY*     2.8    19.2    +      -       -      +
    863A  ASN*     3.9     7.1    -      -       -      +
    892A  ARG*     5.3     0.2    -      -       -      +
    895A  TYR*     2.9    49.6    +      -       +      +
    896A  LEU*     3.6    17.0    -      -       -      +
    897A  LEU      3.3     0.2    -      -       -      -
    898A  ARG*     1.3    74.0    -      -       -      +
    900A  ALA*     1.3    59.9    +      -       -      +
    902A  GLN*     3.2    16.3    +      -       +      +
    903A  LEU*     2.8    46.2    +      -       +      +
   1105A  LEU*     3.9    29.0    -      -       -      +
   1109A  GLU*     2.7    32.7    +      -       -      -
   1143A  ILE*     5.2     8.5    -      -       +      -
   1147A  LEU*     4.4     3.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 900 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    862A  GLY*     4.1     5.9    -      -       -      -
    863A  ASN      3.8    16.4    -      -       -      +
    864A  ALA*     4.1     1.7    -      -       -      +
    880A  ALA*     4.2     9.4    -      -       +      -
    881A  VAL      3.7    26.0    -      -       -      +
    882A  GLY*     4.5     4.7    -      -       -      +
    896A  LEU      3.0    17.0    +      -       -      +
    897A  LEU*     3.3     7.6    +      -       +      +
    899A  ARG*     1.3    75.2    -      -       -      +
    901A  VAL*     1.3    57.8    +      -       +      +
    903A  LEU*     3.5     2.0    +      -       -      +
    904A  SER*     2.8    33.9    +      -       -      -
    921A  ILE*     5.4     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 901 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    897A  LEU*     3.1    15.7    +      -       +      +
    898A  ARG*     3.5     7.2    -      -       -      +
    900A  ALA*     1.3    73.1    -      -       -      +
    902A  GLN*     1.3    65.2    +      -       -      +
    904A  SER*     3.2     6.6    +      -       -      -
    905A  LEU*     3.0    37.9    +      -       +      +
    918A  ILE*     4.8     8.7    -      -       +      -
    921A  ILE*     3.9    24.9    -      -       +      -
    937A  ILE*     3.9    36.1    -      -       +      +
    940A  ALA*     3.6    21.1    -      -       +      -
    941A  ILE*     4.4     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 902 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    895A  TYR*     6.0     0.9    -      -       -      -
    898A  ARG*     2.8    39.0    +      -       -      +
    899A  ARG*     3.2    22.4    +      -       -      +
    901A  VAL*     1.3    73.0    -      -       -      +
    903A  LEU*     1.3    58.9    +      -       +      +
    905A  LEU*     3.4    10.7    +      -       +      +
    906A  CYS*     3.0    33.7    +      -       -      -
    940A  ALA*     4.4    12.8    -      -       +      +
    943A  GLU*     3.4    19.8    +      -       -      +
    944A  ASN*     5.1     3.7    -      -       +      +
   1142A  ASN*     4.1     8.4    -      -       -      +
   1143A  ILE*     3.9    24.6    -      -       +      +
   1146A  GLU*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 903 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    862A  GLY      3.4    26.0    -      -       -      +
    863A  ASN*     3.8    13.0    -      -       -      -
    864A  ALA*     3.8    17.5    -      -       +      +
    899A  ARG*     2.8    24.6    +      -       +      +
    900A  ALA      3.9     0.7    -      -       -      +
    902A  GLN*     1.3    78.2    -      -       +      +
    904A  SER*     1.3    56.4    +      -       -      +
    906A  CYS*     3.3     6.8    +      -       +      +
    907A  LEU*     3.0    32.2    +      -       +      +
   1097A  TRP*     3.7    35.9    -      -       +      -
   1099A  ASN      4.9     3.3    -      -       -      +
   1100A  GLY*     4.1    13.7    -      -       -      +
   1105A  LEU*     3.6    18.6    -      -       +      -
   1143A  ILE*     4.5     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 904 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    820A  VAL*     3.7    16.9    -      -       -      +
    864A  ALA*     3.6     7.5    -      -       -      +
    878A  ILE*     3.6    32.2    -      -       -      +
    880A  ALA*     3.5    21.3    -      -       -      +
    900A  ALA      2.8    22.1    +      -       -      -
    901A  VAL*     3.2     7.7    +      -       -      -
    903A  LEU*     1.3    74.7    -      -       -      +
    905A  LEU*     1.3    65.3    +      -       -      +
    907A  LEU*     3.3     1.6    +      -       -      -
    908A  ALA*     3.0    19.6    +      -       -      +
    916A  ILE*     4.8     2.2    -      -       -      -
    918A  ILE*     5.9     1.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 905 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    901A  VAL*     3.0    33.3    +      -       +      +
    902A  GLN*     3.6     8.7    -      -       -      +
    904A  SER*     1.3    76.3    -      -       -      +
    906A  CYS*     1.3    56.0    +      -       -      +
    908A  ALA*     3.1     5.4    +      -       -      +
    909A  GLU*     2.9    35.9    +      -       -      +
    916A  ILE*     4.5     8.3    -      -       +      -
    918A  ILE*     4.1    22.9    -      -       +      -
    940A  ALA      4.4     2.2    -      -       -      +
    941A  ILE*     4.2    16.8    -      -       +      -
    944A  ASN*     3.6    44.4    -      -       +      +
    954A  LEU*     3.8    23.1    -      -       +      -
    957A  ILE*     5.1     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 906 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    902A  GLN*     3.0    21.2    +      -       -      +
    903A  LEU*     3.5    13.7    -      -       +      +
    904A  SER      3.3     0.2    -      -       -      -
    905A  LEU*     1.3    75.9    -      -       -      +
    907A  LEU*     1.3    57.6    +      -       +      +
    909A  GLU*     3.2     7.0    +      -       -      +
    910A  LYS*     2.9    28.9    +      -       -      +
    944A  ASN*     5.3     6.1    -      -       -      -
   1097A  TRP*     5.2     7.9    -      -       +      +
   1099A  ASN      6.1     2.2    -      -       -      +
   1140A  PRO*     5.2     8.5    -      -       -      -
   1143A  ILE*     4.3    19.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 907 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    864A  ALA*     3.8    12.8    -      -       +      +
    865A  THR*     3.7    43.1    -      -       -      +
    866A  ILE*     4.2    16.6    -      -       +      +
    878A  ILE*     4.1    14.4    -      -       +      -
    903A  LEU*     3.0    18.6    +      -       +      +
    904A  SER      3.7     6.7    -      -       -      +
    905A  LEU      3.3     0.2    -      -       -      -
    906A  CYS*     1.3    76.3    -      -       +      +
    908A  ALA*     1.3    62.7    +      -       -      +
    910A  LYS*     3.2     4.6    +      -       +      +
    911A  TYR*     3.1    36.7    +      -       +      -
   1099A  ASN*     4.1    37.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 908 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    818A  VAL*     4.5     7.2    -      -       +      -
    878A  ILE*     3.8     9.7    -      -       +      +
    904A  SER      3.0    14.6    +      -       -      +
    905A  LEU      3.5     7.9    -      -       -      +
    907A  LEU*     1.3    76.0    -      -       -      +
    909A  GLU*     1.3    62.3    +      -       -      +
    911A  TYR*     3.3     3.1    +      -       -      -
    912A  LYS      3.2     3.3    +      -       -      -
    913A  TYR*     3.0    35.5    +      -       +      +
    916A  ILE*     3.8    23.3    -      -       +      -
    954A  LEU*     4.2    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 909 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    905A  LEU*     2.9    18.3    +      -       -      +
    906A  CYS*     3.2     5.6    +      -       -      +
    908A  ALA*     1.3    75.8    -      -       -      +
    910A  LYS*     1.3    59.5    +      -       -      +
    912A  LYS*     2.9    28.3    +      -       -      +
    913A  TYR      4.9     1.1    -      -       -      +
    944A  ASN*     3.1    22.0    +      -       -      +
    945A  PHE*     4.6     0.2    -      -       -      -
    951A  GLY      5.3     4.3    -      -       -      +
    952A  HIS*     2.9    32.5    +      -       -      +
    953A  CYS*     3.0    37.1    +      -       -      +
    954A  LEU*     3.2    26.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 910 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    906A  CYS      2.9    13.4    +      -       -      +
    907A  LEU*     3.2    13.2    +      -       +      +
    909A  GLU*     1.3    77.6    -      -       -      +
    911A  TYR*     1.3    74.9    +      -       +      +
    912A  LYS*     3.3    17.2    +      -       -      +
   1099A  ASN*     2.6    44.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 911 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    866A  ILE*     3.7    42.1    -      -       +      +
    876A  HIS*     4.1    31.4    +      +       -      -
    907A  LEU*     3.1    26.6    +      -       +      +
    909A  GLU      3.3     0.2    -      -       -      -
    910A  LYS*     1.3    93.5    +      -       +      +
    912A  LYS*     1.3    70.4    +      -       -      +
    913A  TYR*     3.2    35.3    +      +       +      -
   1099A  ASN*     5.7     0.4    -      -       -      -
----------------------------------------------------------
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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