Contacts of the helix formed by residues 1576 - 1603 (chain A) in PDB entry 6J8H


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 VAL1576 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1494A  GLN*     3.9    20.6    -      -       -      +
   1572A  TYR      5.0     0.9    -      -       -      +
   1573A  TYR      3.5     2.0    +      -       -      -
   1574A  PHE      3.4     1.6    -      -       -      +
   1575A  THR*     1.3    90.4    +      -       -      +
   1577A  GLY*     1.3    66.7    +      -       -      +
   1578A  TRP*     3.4    22.2    -      -       +      +
   1579A  ASN*     3.4    37.1    +      -       -      +
   1580A  ILE*     3.4    17.7    +      -       -      +
   1625A  LYS*     6.0     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY1577 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1575A  THR      3.6     3.4    +      -       -      -
   1576A  VAL*     1.3    75.0    -      -       -      +
   1578A  TRP*     1.3    62.0    +      -       -      +
   1580A  ILE*     3.3    16.9    +      -       -      +
   1581A  PHE*     3.3    11.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP1578 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1576A  VAL*     3.3    12.7    -      -       +      +
   1577A  GLY*     1.3    73.4    -      -       -      +
   1579A  ASN*     1.3    67.0    +      -       -      +
   1581A  PHE*     3.1    42.8    +      +       +      +
   1582A  ASP*     2.9    23.0    +      -       +      +
   1621A  LEU      4.6     1.8    -      -       -      -
   1622A  ARG*     4.5     6.3    -      -       +      -
   1624A  VAL*     4.2    15.5    -      -       +      -
   1625A  LYS*     3.7    66.4    -      -       +      +
   1631A  ARG*     3.8    32.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN1579 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1565A  LYS*     3.8    18.4    +      -       -      +
   1569A  LEU*     4.5     8.7    -      -       -      +
   1573A  TYR*     2.7    76.3    +      -       +      +
   1576A  VAL*     3.4    28.1    +      -       -      +
   1577A  GLY      3.3     0.6    -      -       -      -
   1578A  TRP*     1.3    75.9    -      -       -      +
   1580A  ILE*     1.3    57.6    +      -       -      +
   1582A  ASP*     3.1     6.6    +      -       -      +
   1583A  PHE      2.8    16.6    +      -       -      -
   1625A  LYS*     4.1    12.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1580 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1573A  TYR*     4.3     2.0    -      -       +      -
   1574A  PHE*     2.9    59.0    -      -       +      +
   1576A  VAL      3.6    12.6    -      -       -      +
   1577A  GLY*     3.3    10.7    +      -       -      +
   1578A  TRP      3.2     0.8    -      -       -      -
   1579A  ASN*     1.3    76.5    -      -       -      +
   1581A  PHE*     1.3    66.3    +      -       -      +
   1583A  PHE*     3.2     4.4    +      -       +      +
   1584A  VAL*     2.9    35.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE1581 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1577A  GLY      3.3     9.0    +      -       -      +
   1578A  TRP*     3.1    44.0    +      +       +      +
   1580A  ILE*     1.3    78.9    -      -       -      +
   1582A  ASP*     1.3    54.1    +      -       -      +
   1584A  VAL*     3.3     9.2    +      -       +      +
   1585A  VAL*     2.7    59.1    +      -       +      +
   1618A  GLY*     4.0     4.3    -      -       -      -
   1621A  LEU*     3.8    28.0    -      -       +      -
   1622A  ARG*     4.1    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP1582 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1561A  GLU*     3.2     7.1    -      -       -      +
   1562A  CYS*     5.4     3.7    -      -       -      +
   1565A  LYS*     3.1    23.1    +      -       -      +
   1573A  TYR*     4.6     2.4    +      -       -      +
   1578A  TRP*     2.9    13.2    +      -       +      +
   1579A  ASN*     3.4    12.1    -      -       -      +
   1581A  PHE*     1.3    80.6    -      -       +      +
   1583A  PHE*     1.3    59.4    +      -       -      +
   1585A  VAL*     2.7    28.5    -      -       -      +
   1586A  VAL*     3.4    10.9    +      -       -      +
   1622A  ARG*     2.5    54.8    +      -       -      +
   1625A  LYS*     5.8     3.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE1583 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1562A  CYS*     4.1    21.3    -      -       -      -
   1566A  LEU*     4.9    10.5    -      -       +      -
   1573A  TYR*     3.0    26.0    +      +       +      +
   1574A  PHE*     4.4    27.4    -      +       +      -
   1579A  ASN      2.8    12.7    +      -       -      +
   1580A  ILE*     3.6     8.7    -      -       +      +
   1582A  ASP*     1.3    72.1    -      -       -      +
   1584A  VAL*     1.3    74.1    +      -       +      +
   1586A  VAL*     3.3    16.1    +      -       -      +
   1587A  ILE*     3.4    39.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL1584 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1580A  ILE*     2.9    35.4    +      -       +      +
   1581A  PHE*     3.7    10.3    -      -       +      +
   1582A  ASP      3.3     0.2    -      -       -      -
   1583A  PHE*     1.3    88.0    -      -       +      +
   1585A  VAL*     1.3    62.4    +      -       +      +
   1587A  ILE*     3.2     7.6    +      -       +      +
   1588A  ILE*     3.1    38.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL1585 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1581A  PHE*     2.7    55.4    +      -       +      +
   1582A  ASP*     2.7    35.9    -      -       -      +
   1584A  VAL*     1.3    76.7    -      -       +      +
   1586A  VAL*     1.3    63.0    +      -       +      +
   1588A  ILE*     3.3    10.6    +      -       +      +
   1589A  SER*     2.9    30.2    +      -       -      -
   1615A  ALA      5.6     1.2    -      -       -      +
   1618A  GLY*     4.4    17.5    -      -       -      +
   1619A  ARG*     4.8     8.1    -      -       +      +
   1622A  ARG*     4.0    15.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL1586 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1555A  ILE*     5.8     0.9    -      -       +      -
   1558A  PHE*     4.2    27.1    -      -       +      +
   1559A  THR*     3.1    34.1    -      -       +      +
   1562A  CYS*     4.4    17.3    -      -       +      -
   1582A  ASP*     3.5    18.4    -      -       -      +
   1583A  PHE*     3.3     8.7    +      -       +      +
   1584A  VAL      3.2     0.4    -      -       -      -
   1585A  VAL*     1.3    87.5    -      -       +      +
   1587A  ILE*     1.3    64.9    +      -       +      +
   1589A  SER*     3.3     6.1    +      -       -      -
   1590A  ILE*     3.1    30.8    +      -       +      +
   1622A  ARG*     5.3     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1587 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1583A  PHE*     3.4    39.0    +      -       +      +
   1584A  VAL*     3.2    10.4    +      -       +      +
   1586A  VAL*     1.3    80.4    -      -       +      +
   1588A  ILE*     1.3    66.1    +      -       +      +
   1590A  ILE*     4.2     6.2    -      -       +      +
   1591A  VAL*     3.1    38.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE1588 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1584A  VAL*     3.1    32.5    +      -       +      +
   1585A  VAL*     3.7     9.6    -      -       +      +
   1587A  ILE*     1.3    79.5    -      -       +      +
   1589A  SER*     1.3    57.3    +      -       -      +
   1591A  VAL*     3.5     5.3    +      -       -      +
   1592A  GLY*     2.9    26.3    +      -       -      -
   1615A  ALA*     3.3    31.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER1589 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1555A  ILE*     3.7    14.8    -      -       -      +
   1585A  VAL      2.9    18.6    +      -       -      -
   1586A  VAL*     3.3     8.3    +      -       -      -
   1588A  ILE*     1.3    75.8    -      -       -      +
   1590A  ILE*     1.3    64.9    +      -       -      +
   1592A  GLY*     3.5     1.1    +      -       -      -
   1593A  MET*     3.2    21.5    +      -       -      +
   1615A  ALA*     5.0    10.1    +      -       -      -
   1616A  ARG*     5.1     1.2    -      -       -      +
   1619A  ARG*     2.4    45.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE1590 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1555A  ILE*     4.1    14.8    -      -       +      -
   1559A  THR*     3.6    28.9    -      -       +      +
   1586A  VAL*     3.1    20.9    +      -       +      +
   1587A  ILE*     4.2     6.5    -      -       +      +
   1589A  SER*     1.3    73.8    -      -       -      +
   1591A  VAL*     1.3    66.4    +      -       +      +
   1593A  MET*     3.3    12.6    +      -       +      +
   1594A  PHE*     3.0    44.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL1591 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1587A  ILE*     3.1    28.0    +      -       +      +
   1588A  ILE*     3.8     4.9    -      -       -      +
   1589A  SER      3.3     0.4    -      -       -      -
   1590A  ILE*     1.3    79.4    -      -       +      +
   1592A  GLY*     1.3    59.3    +      -       -      +
   1594A  PHE*     4.5     5.4    -      -       -      -
   1595A  LEU*     2.8    59.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY1592 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1588A  ILE      2.9    18.0    +      -       -      -
   1589A  SER      3.5     1.8    +      -       -      -
   1590A  ILE      3.2     0.4    -      -       -      -
   1591A  VAL*     1.3    78.7    -      -       -      +
   1593A  MET*     1.3    61.3    +      -       -      +
   1595A  LEU*     4.7     0.7    -      -       -      -
   1596A  ALA*     3.2    23.9    +      -       -      +
   1612A  ILE*     3.6    28.5    -      -       -      +
   1613A  ARG*     5.5     3.1    -      -       -      +
   1615A  ALA*     4.7     5.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET1593 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1548A  TYR*     4.5    18.2    -      -       +      +
   1552A  VAL*     4.4    20.6    -      -       +      -
   1555A  ILE*     3.1    44.6    -      -       +      -
   1589A  SER      3.2    11.6    +      -       -      +
   1590A  ILE*     3.3    13.0    +      -       +      +
   1592A  GLY*     1.3    77.3    -      -       -      +
   1594A  PHE*     1.3    87.4    +      -       +      +
   1596A  ALA*     3.5     4.3    +      -       -      +
   1597A  ASP*     2.9    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE1594 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1590A  ILE*     3.0    32.9    +      -       +      +
   1591A  VAL*     3.9     5.6    -      -       -      +
   1593A  MET*     1.3    95.3    -      -       -      +
   1595A  LEU*     1.3    61.0    +      -       +      +
   1597A  ASP*     3.0    13.5    +      -       +      +
   1598A  LEU*     2.7    34.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1595 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1591A  VAL*     2.8    46.9    +      -       +      +
   1592A  GLY      4.2     2.2    -      -       -      +
   1594A  PHE*     1.3    76.2    -      -       +      +
   1596A  ALA*     1.3    53.4    +      -       -      +
   1598A  LEU*     3.6    19.2    -      -       +      +
   1599A  ILE*     2.7    49.1    +      -       +      +
   1612A  ILE*     4.3    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA1596 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1592A  GLY      3.2    18.3    +      -       -      +
   1593A  MET*     3.7     6.7    -      -       -      +
   1595A  LEU*     1.3    78.2    -      -       -      +
   1597A  ASP*     1.3    55.3    +      -       -      +
   1599A  ILE*     3.3     7.3    +      -       -      +
   1600A  GLU*     2.8    38.0    +      -       -      +
   1609A  PHE*     2.8    38.5    -      -       +      -
   1612A  ILE*     4.4     6.0    -      -       +      +
   1613A  ARG*     4.9     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP1597 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1548A  TYR*     3.7    30.6    +      -       -      -
   1593A  MET*     2.9    20.7    +      -       -      +
   1594A  PHE*     3.0    18.9    +      -       +      +
   1596A  ALA*     1.3    77.4    -      -       -      +
   1598A  LEU*     1.3    62.2    +      -       -      +
   1600A  GLU*     3.2    15.8    +      -       -      +
   1601A  THR*     2.8    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1598 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1594A  PHE      2.7    17.9    +      -       -      +
   1595A  LEU*     3.6    22.9    -      -       +      +
   1597A  ASP*     1.3    71.8    -      -       -      +
   1599A  ILE*     1.3    61.9    +      -       +      +
   1601A  THR*     2.7    16.4    -      -       +      +
   1602A  TYR*     2.7    54.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE1599 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1595A  LEU*     2.7    34.0    +      -       +      +
   1596A  ALA*     3.3     7.6    -      -       -      +
   1598A  LEU*     1.3    81.0    -      -       +      +
   1600A  GLU*     1.3    53.5    +      -       +      +
   1602A  TYR*     4.5     4.3    -      -       -      -
   1603A  PHE*     2.3    46.2    +      -       -      +
   1604A  VAL      5.0     1.3    -      -       -      +
   1605A  SER      4.2    17.9    -      -       -      +
   1608A  LEU*     3.9    28.5    -      -       +      -
   1609A  PHE*     4.4    22.0    -      -       +      +
   1612A  ILE*     4.2    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU1600 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1548A  TYR*     6.1     0.9    -      -       -      -
   1596A  ALA*     2.8    16.1    +      -       -      +
   1597A  ASP*     3.5    17.1    -      -       -      +
   1598A  LEU      3.2     0.2    -      -       -      -
   1599A  ILE*     1.3    79.3    -      -       +      +
   1601A  THR*     1.3    58.1    +      -       -      +
   1603A  PHE*     2.7    44.2    -      -       +      -
   1609A  PHE*     3.7    27.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR1601 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1597A  ASP      2.8    17.4    +      -       -      +
   1598A  LEU*     2.7    36.6    -      -       +      +
   1600A  GLU*     1.3    73.6    -      -       -      +
   1602A  TYR*     1.3    65.2    +      -       +      +
   1603A  PHE*     3.3    16.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR1602 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1598A  LEU*     2.7    39.3    +      -       +      +
   1599A  ILE*     4.0     3.8    -      -       -      +
   1601A  THR*     1.3    77.5    +      -       -      +
   1603A  PHE*     1.3    77.8    +      -       -      +
   1604A  VAL*     4.2     6.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE1603 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1599A  ILE*     2.3    34.8    +      -       -      +
   1600A  GLU*     2.7    35.0    -      -       +      -
   1601A  THR*     3.3    17.3    -      -       -      -
   1602A  TYR*     1.3    75.7    -      -       -      +
   1604A  VAL*     1.3    82.2    +      -       +      +
   1605A  SER      5.4     0.2    -      -       -      -
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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
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  Atomic class           I  II  III   IV   V   VI  VII  VIII
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   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
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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