Contacts of the helix formed by residues 1633 - 1655 (chain B) in PDB entry 5EK0


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 MET1633 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1629B  VAL*     3.6    10.8    -      -       -      +
   1630B  ILE*     3.3    25.1    -      -       +      +
   1631B  PRO      2.8     0.8    +      -       -      -
   1632B  GLY*     1.3    76.2    -      -       -      +
   1634B  LEU*     1.4    60.0    +      -       -      +
   1635B  SER      3.3     3.6    -      -       -      -
   1636B  VAL*     3.1    18.4    +      -       +      +
   1637B  ILE*     3.0    45.5    +      -       +      +
   1715B  LEU*     3.9    28.5    -      -       +      +
   1718B  ALA*     4.9     2.7    -      -       +      -
   1719B  ILE*     3.7    33.9    -      -       +      -
   1710C  PHE*     3.6    28.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1634 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1804A  PX4      5.5    12.3    -      -       +      -
   1630B  ILE*     3.3    39.4    +      -       +      +
   1631B  PRO*     3.0    20.0    +      -       +      +
   1633B  MET*     1.4    74.6    -      -       -      +
   1635B  SER*     1.3    59.5    +      -       -      +
   1637B  ILE*     3.6    14.1    -      -       +      +
   1638B  ALA*     3.0    29.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER1635 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1618A  GLN*     3.7    29.7    +      -       -      +
   1619A  MET*     5.8     0.2    -      -       -      -
   1622A  ILE*     3.2    39.6    -      -       -      +
   1804A  PX4      4.3     8.3    -      -       -      +
   1631B  PRO      4.7     0.4    +      -       -      -
   1633B  MET      3.3     0.8    -      -       -      -
   1634B  LEU*     1.3    75.4    -      -       -      +
   1636B  VAL*     1.4    55.6    +      -       -      +
   1638B  ALA*     3.3     7.5    +      -       -      +
   1639B  LEU      2.8    29.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL1636 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1622A  ILE*     4.7    11.9    -      -       +      -
   1626A  LEU*     5.6     5.2    -      -       +      -
   1633B  MET*     3.1    19.0    +      -       +      +
   1635B  SER*     1.4    77.5    -      -       -      +
   1637B  ILE*     1.4    58.2    +      -       -      +
   1639B  LEU*     3.6     8.9    +      -       +      +
   1640B  MET*     3.1    27.5    +      -       -      +
   1711B  VAL*     3.7    34.4    -      -       +      +
   1714B  ASN*     5.0     4.0    -      -       +      +
   1715B  LEU*     3.8    29.7    -      -       +      +
   1718B  ALA*     5.1     8.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE1637 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1630B  ILE*     3.8     8.3    -      -       +      +
   1633B  MET*     3.0    44.2    +      -       +      +
   1634B  LEU*     3.6    26.2    -      -       +      +
   1635B  SER      3.3     0.2    -      -       -      -
   1636B  VAL*     1.4    73.5    -      -       -      +
   1638B  ALA*     1.4    57.0    +      -       -      +
   1640B  MET*     3.4     8.1    +      -       -      +
   1641B  THR*     2.9    35.8    +      -       -      +
   1715B  LEU*     3.8    16.2    -      -       +      -
   1802B  PX4      4.6     9.5    -      -       +      +
   1706C  PHE*     6.1     4.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1638 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1619A  MET*     3.7    25.3    -      -       +      +
   1804A  PX4      4.6    20.1    -      -       +      +
   1634B  LEU*     3.0    20.0    +      -       +      +
   1635B  SER*     3.4     9.0    -      -       -      +
   1637B  ILE*     1.4    74.3    -      -       -      +
   1639B  LEU*     1.4    63.1    +      -       -      +
   1641B  THR*     3.4     8.5    +      -       -      -
   1642B  LEU*     3.2    17.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1639 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1613A  VAL*     4.2     8.7    -      -       +      -
   1619A  MET*     3.9    13.9    -      -       -      +
   1622A  ILE*     3.6    18.2    -      -       +      -
   1623A  VAL*     3.6    20.0    -      -       +      -
   1626A  LEU*     3.5    31.9    -      -       +      -
   1635B  SER      2.8    20.8    +      -       -      +
   1636B  VAL*     3.8     5.6    -      -       -      +
   1638B  ALA*     1.4    68.9    -      -       -      +
   1640B  MET*     1.3    58.7    +      -       -      +
   1642B  LEU*     3.3     2.8    +      -       -      +
   1643B  PHE*     2.9    70.0    +      -       +      -
   1711B  VAL*     4.2    18.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET1640 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1636B  VAL      3.1    18.2    +      -       -      +
   1637B  ILE*     3.4     8.5    -      -       -      +
   1638B  ALA      3.3     0.2    -      -       -      -
   1639B  LEU*     1.3    77.5    -      -       -      +
   1641B  THR*     1.4    56.0    +      -       -      +
   1643B  PHE*     3.2     9.6    +      -       -      +
   1644B  PHE*     2.8    31.5    +      -       +      +
   1677B  MET*     4.1     2.2    -      -       -      -
   1708B  VAL*     3.3    48.5    -      -       +      +
   1711B  VAL*     3.7    26.9    -      -       +      -
   1712B  MET*     3.6    33.7    -      -       +      +
   1715B  LEU*     6.2     1.3    -      -       +      -
   1802B  PX4      3.7    24.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR1641 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1637B  ILE*     2.9    19.9    +      -       -      +
   1638B  ALA*     3.4     7.7    +      -       -      -
   1640B  MET*     1.4    74.7    -      -       -      +
   1642B  LEU*     1.4    57.7    +      -       -      +
   1644B  PHE*     3.2     8.8    +      -       -      +
   1645B  TYR*     3.0    53.3    +      -       +      +
   1670B  PHE*     5.0     5.4    -      -       +      -
   1802B  PX4      4.2    20.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1642 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1518A  MET*     4.0    30.3    -      -       +      -
   1612A  LEU*     3.9    35.7    -      -       +      +
   1613A  VAL*     3.6    33.9    -      -       +      +
   1619A  MET*     3.9    23.3    -      -       +      -
   1804A  PX4      5.2     8.7    -      -       +      -
   1638B  ALA      3.2    10.4    +      -       -      +
   1639B  LEU*     3.6     9.0    -      -       -      +
   1640B  MET      3.3     0.2    -      -       -      -
   1641B  THR*     1.4    75.4    -      -       -      +
   1643B  PHE*     1.3    61.7    +      -       -      +
   1645B  TYR*     3.2     8.6    +      -       +      +
   1646B  ILE*     3.2    35.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE1643 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1613A  VAL*     3.5    25.6    -      -       +      -
   1623A  VAL*     4.4     9.2    -      -       +      -
   1626A  LEU*     6.0     0.9    -      -       +      -
   1639B  LEU*     2.9    51.4    +      -       +      +
   1640B  MET*     3.4    13.7    -      -       -      +
   1642B  LEU*     1.3    74.6    -      -       -      +
   1644B  PHE*     1.3    63.2    +      -       +      +
   1646B  ILE*     3.7     9.5    +      -       +      +
   1647B  PHE*     3.2    37.3    +      +       +      -
   1707B  VAL*     3.6    32.1    -      -       +      -
   1708B  VAL*     5.9     2.2    -      -       +      -
   1711B  VAL*     3.9    26.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE1644 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1640B  MET*     2.8    19.8    +      -       +      +
   1641B  THR*     3.2    13.4    +      -       -      +
   1643B  PHE*     1.3    75.0    -      -       -      +
   1645B  TYR*     1.4    53.8    +      -       -      +
   1647B  PHE*     3.5     6.0    +      -       -      +
   1648B  ALA*     2.8    36.2    +      -       -      +
   1670B  PHE*     3.7    36.6    -      +       +      -
   1673B  LEU*     3.5    29.2    -      -       +      +
   1674B  PHE*     3.6    29.8    -      +       +      -
   1677B  MET*     3.5    28.9    -      -       -      -
   1704B  PHE*     4.1     5.4    -      +       -      -
   1708B  VAL*     3.7    17.9    -      -       +      -
   1802B  PX4      3.7    24.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR1645 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1518A  MET*     4.1    26.2    -      -       +      -
   1522A  MET*     3.6    45.1    -      -       +      +
   1804A  PX4      5.5    11.5    -      -       +      +
   1641B  THR*     3.0    42.8    +      -       +      +
   1642B  LEU*     3.2    11.8    +      -       +      +
   1644B  PHE*     1.4    70.0    -      -       -      +
   1646B  ILE*     1.4    54.9    +      -       -      +
   1648B  ALA*     2.8     6.9    +      -       -      +
   1649B  ILE*     2.8    38.8    +      -       +      +
   1666B  LEU*     4.2     3.4    -      -       +      -
   1670B  PHE*     3.5    32.1    -      +       -      -
   1802B  PX4      4.1    13.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE1646 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1518A  MET*     5.2     1.1    -      -       -      -
   1606A  ILE*     3.4    31.7    -      -       +      +
   1609A  ILE*     3.8    38.8    -      -       +      +
   1610A  LEU*     3.8    25.4    -      -       +      -
   1613A  VAL*     4.5    11.9    -      -       +      -
   1642B  LEU*     3.2    35.8    +      -       +      +
   1643B  PHE*     4.0    11.9    -      -       +      +
   1645B  TYR*     1.4    74.0    -      -       +      +
   1647B  PHE*     1.4    61.8    +      -       +      +
   1649B  ILE*     3.5     3.7    +      -       -      +
   1650B  MET*     3.2    36.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE1647 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1643B  PHE*     3.2    30.6    +      +       +      +
   1644B  PHE      3.8     3.6    -      -       -      +
   1645B  TYR      3.2     0.6    -      -       -      -
   1646B  ILE*     1.4    75.0    -      -       +      +
   1648B  ALA*     1.4    60.2    +      -       -      +
   1649B  ILE      3.4     0.2    -      -       -      -
   1650B  MET*     3.5    18.7    +      -       +      -
   1651B  ALA      3.1    20.6    +      -       -      -
   1673B  LEU*     3.4    20.6    -      -       +      +
   1700B  PHE*     3.5    36.4    -      +       -      -
   1703B  PRO*     4.9     3.4    -      -       +      -
   1704B  PHE*     3.5    48.7    -      +       +      -
   1707B  VAL*     3.7    34.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1648 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1644B  PHE*     2.8    21.4    +      -       +      +
   1645B  TYR      2.8     4.2    +      -       -      +
   1647B  PHE*     1.4    69.0    -      -       -      +
   1649B  ILE*     1.4    62.1    +      -       -      +
   1650B  MET      3.2     1.6    -      -       -      -
   1652B  THR*     2.9    32.4    +      -       -      -
   1666B  LEU*     3.9     9.6    -      -       +      +
   1669B  SER*     3.6    10.9    -      -       -      -
   1670B  PHE*     3.6    31.0    -      -       +      -
   1673B  LEU*     3.5    13.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE1649 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1518A  MET*     3.8    32.1    -      -       +      +
   1521A  MET*     3.8    18.8    -      -       +      +
   1522A  MET*     4.0    10.3    -      -       +      -
   1524A  GLU*     4.0     1.9    -      -       -      +
   1605A  ARG*     3.4    26.3    +      -       -      +
   1606A  ILE*     3.7    15.9    -      -       +      -
   1609A  ILE*     4.0    17.0    -      -       +      -
   1645B  TYR*     2.8    28.5    +      -       +      +
   1646B  ILE      3.7     5.2    -      -       -      +
   1648B  ALA*     1.4    74.2    -      -       -      +
   1650B  MET*     1.3    60.4    +      -       -      +
   1652B  THR*     4.4     2.5    -      -       -      -
   1653B  GLN*     3.6    19.4    +      -       -      +
   1666B  LEU*     3.7    20.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET1650 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1603A  LEU*     3.7    29.4    -      -       +      -
   1606A  ILE*     3.5    29.8    -      -       +      -
   1610A  LEU*     5.9     0.7    -      -       +      -
   1646B  ILE*     3.2    41.6    +      -       +      +
   1647B  PHE*     3.5    32.3    -      -       +      +
   1648B  ALA      3.2     0.2    -      -       -      -
   1649B  ILE*     1.3    76.5    -      -       -      +
   1651B  ALA*     1.3    58.8    +      -       -      +
   1652B  THR      3.4     0.2    -      -       -      -
   1653B  GLN*     3.3     5.5    +      -       -      +
   1654B  LEU*     3.1    33.7    +      -       -      +
   1700B  PHE*     3.6    19.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA1651 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1647B  PHE      3.1    17.5    +      -       -      +
   1648B  ALA      3.6     0.2    +      -       -      -
   1650B  MET*     1.3    71.4    -      -       -      +
   1652B  THR*     1.3    65.2    +      -       -      +
   1655B  PHE*     3.1    39.8    +      -       +      +
   1656B  GLY      3.3     5.2    +      -       -      -
   1663B  PHE*     3.6    30.7    -      -       +      +
   1669B  SER*     3.9    11.7    -      -       -      +
   1673B  LEU*     4.3     6.5    -      -       +      -
   1700B  PHE*     4.1     8.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR1652 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1524A  GLU*     3.9    24.7    -      -       -      +
   1525A  LYS*     4.0     7.6    -      -       -      -
   1526A  GLU      4.8     0.4    +      -       -      +
   1648B  ALA      2.9    15.6    +      -       -      -
   1649B  ILE*     4.4     4.7    -      -       -      -
   1651B  ALA*     1.3    75.6    -      -       -      +
   1653B  GLN*     1.3    62.7    +      -       -      +
   1656B  GLY*     3.2    20.1    -      -       -      -
   1657B  GLU*     4.5     0.5    +      -       -      +
   1663B  PHE      3.2    18.6    -      -       -      +
   1664B  GLY      3.6    18.8    -      -       -      +
   1665B  THR      3.3    11.8    +      -       -      -
   1666B  LEU*     3.8     6.0    -      -       +      +
   1669B  SER*     2.7    21.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN1653 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1524A  GLU*     3.8    11.8    +      -       -      +
   1599A  ARG*     2.8    37.9    +      -       +      +
   1602A  ARG*     3.2    24.4    +      -       -      +
   1603A  LEU*     3.2    42.1    -      -       -      +
   1605A  ARG*     3.3    32.5    +      -       -      +
   1606A  ILE*     4.5     2.8    -      -       -      +
   1649B  ILE      3.6    13.2    +      -       -      +
   1650B  MET      3.3     8.5    +      -       -      +
   1651B  ALA      3.3     0.2    -      -       -      -
   1652B  THR*     1.3    82.5    -      -       -      +
   1654B  LEU*     1.3    63.2    +      -       -      +
   1656B  GLY      4.5     0.3    +      -       -      -
   1657B  GLU*     4.7    10.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU1654 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1599A  ARG*     3.5    52.6    -      -       +      +
   1600A  VAL*     4.4    10.8    -      -       +      -
   1603A  LEU*     3.8    27.8    -      -       +      -
   1650B  MET      3.1    19.2    +      -       -      +
   1653B  GLN*     1.3    78.2    -      -       -      +
   1655B  PHE*     1.3    83.8    +      -       +      +
   1657B  GLU*     4.3     6.1    +      -       -      +
   1694B  TYR*     3.5    10.7    +      -       -      -
   1700B  PHE*     4.2    25.4    -      -       +      -
   1801B  PX4      4.1    21.1    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE1655 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1651B  ALA*     3.1    24.6    +      -       +      +
   1654B  LEU*     1.3    84.2    -      -       +      +
   1656B  GLY*     1.3    55.1    +      -       -      +
   1657B  GLU      3.1     3.8    +      -       -      -
   1658B  ARG      3.5     2.1    +      -       -      -
   1659B  PHE*     2.8    37.0    +      -       +      +
   1663B  PHE*     3.6    20.0    -      +       +      -
   1690B  LEU*     3.7    12.6    -      -       +      -
   1694B  TYR*     3.6    30.6    +      +       +      -
   1697B  ALA*     4.0    19.5    -      -       +      -
   1700B  PHE*     3.8    30.5    -      +       +      -
   1701B  PHE*     3.5    34.5    -      +       -      -
   1801B  PX4      3.8    19.3    -      -       -      -
----------------------------------------------------------
 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