Contacts of the helix formed by residues 1915 - 1942 (chain X) in PDB entry 3HM6


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 PRO1915 (chain X).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1914X  ILE*     1.3    87.1    -      -       +      +
   1916X  GLU*     1.3    65.7    +      -       -      +
   1917X  ILE*     4.1    11.7    -      -       +      +
   1918X  TYR*     3.0    41.2    +      -       +      +
   1919X  LEU*     2.9    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU1916 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1914X  ILE      3.7     0.6    +      -       -      -
   1915X  PRO*     1.3    71.6    -      -       -      +
   1917X  ILE*     1.3    61.5    +      -       -      +
   1918X  TYR      3.1     0.3    +      -       -      -
   1919X  LEU*     4.6     5.8    -      -       -      +
   1920X  THR*     2.3    40.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1917 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1915X  PRO*     4.1     7.5    -      -       +      +
   1916X  GLU*     1.3    79.9    -      -       -      +
   1918X  TYR*     1.3    76.5    +      -       +      +
   1920X  THR*     3.8     5.5    +      -       -      -
   1921X  ARG*     3.3    18.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR1918 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1739X  LEU*     3.6    22.6    -      -       +      +
   1741X  ARG*     3.5    61.9    +      -       +      +
   1914X  ILE*     3.5    17.0    -      -       +      -
   1915X  PRO*     3.0    35.1    +      -       +      +
   1917X  ILE*     1.3    86.8    -      -       +      +
   1919X  LEU*     1.3    66.0    +      -       -      +
   1920X  THR      3.2     0.9    -      -       -      -
   1921X  ARG*     3.2     5.4    +      -       +      +
   1922X  LEU*     3.1    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1919 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1914X  ILE*     3.7    49.8    -      -       +      +
   1915X  PRO      2.9    11.2    +      -       -      +
   1916X  GLU*     4.0     5.2    -      -       -      +
   1918X  TYR*     1.3    72.9    -      -       -      +
   1920X  THR*     1.3    60.4    +      -       -      +
   1922X  LEU*     3.3    11.9    +      -       +      +
   1923X  LEU*     2.9    43.6    +      -       +      +
   2033X  ILE*     5.4     0.7    -      -       +      -
   2036X  LEU*     4.3    24.0    -      -       +      -
   2037X  LEU*     4.8    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR1920 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1916X  GLU*     2.3    36.5    +      -       -      +
   1917X  ILE*     3.8     6.0    -      -       -      -
   1919X  LEU*     1.3    70.0    -      -       -      +
   1921X  ARG*     1.3    61.2    +      -       -      +
   1923X  LEU*     4.0     8.4    -      -       +      +
   1924X  SER*     2.9    33.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG1921 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1731X  LYS      5.0     4.9    -      -       -      +
   1732X  TYR*     5.8     4.3    -      -       -      -
   1733X  THR      5.0     1.4    +      -       -      -
   1739X  LEU*     4.1    21.8    -      -       +      -
   1917X  ILE      3.3    11.7    +      -       -      +
   1918X  TYR*     3.2    13.6    +      -       +      +
   1920X  THR*     1.3    79.6    -      -       -      +
   1922X  LEU*     1.3    61.2    -      -       -      +
   1924X  SER*     3.5     6.5    -      -       -      -
   1925X  MET*     3.2    19.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1922 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1733X  THR*     3.2    26.0    -      -       +      +
   1734X  LEU*     3.6    22.1    -      -       -      +
   1735X  ASN      3.9    10.1    -      -       -      +
   1736X  ASP*     3.8    25.4    -      -       +      +
   1739X  LEU*     3.9    15.9    -      -       +      -
   1914X  ILE*     4.6     2.7    -      -       +      -
   1918X  TYR      3.1    21.0    +      -       -      +
   1919X  LEU*     3.7    20.4    -      -       +      +
   1921X  ARG*     1.3    78.3    -      -       -      +
   1923X  LEU*     1.3    58.5    +      -       -      +
   1925X  MET*     3.2     5.0    +      -       -      +
   1926X  LYS*     2.9    26.5    +      -       -      +
   2033X  ILE*     4.4     9.9    -      -       +      -
   2037X  LEU*     3.8    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU1923 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1919X  LEU*     2.9    32.1    +      -       +      +
   1920X  THR*     4.0     6.5    -      -       +      +
   1922X  LEU*     1.3    73.0    -      -       -      +
   1924X  SER*     1.3    56.4    +      -       -      +
   1926X  LYS*     3.5     9.3    -      -       +      +
   1927X  GLY*     2.6    34.5    +      -       -      -
   2036X  LEU      4.9     2.9    -      -       -      +
   2037X  LEU*     3.4    40.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER1924 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1920X  THR*     2.9    21.6    +      -       -      -
   1921X  ARG*     3.5     8.5    -      -       -      -
   1923X  LEU*     1.3    76.1    -      -       -      +
   1925X  MET*     1.3    56.4    +      -       -      +
   1927X  GLY*     3.8     1.0    -      -       -      -
   1928X  THR*     2.9    37.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET1925 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1714X  ILE*     4.6     5.2    -      -       +      +
   1717X  GLN*     4.2    25.4    -      -       +      -
   1718X  VAL*     4.2    17.0    -      -       +      -
   1732X  TYR*     4.0    37.6    -      -       +      +
   1733X  THR      3.4    25.4    -      -       -      +
   1734X  LEU*     3.5    11.7    -      -       +      -
   1921X  ARG      3.2     8.3    +      -       -      +
   1922X  LEU      3.2     9.9    +      -       -      +
   1924X  SER*     1.3    75.1    -      -       -      +
   1926X  LYS*     1.3    65.2    +      -       -      +
   1928X  THR*     3.3     5.1    +      -       -      -
   1929X  LEU*     3.0    48.4    +      -       +      +
   2008X  VAL*     4.4    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS1926 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1734X  LEU*     3.3    13.3    -      -       +      +
   1922X  LEU      2.9    18.1    +      -       -      +
   1923X  LEU*     3.5    17.9    -      -       +      +
   1925X  MET*     1.3    69.5    -      -       -      +
   1927X  GLY*     1.3    67.4    +      -       -      +
   1929X  LEU*     3.1     4.6    +      -       -      +
   1930X  GLN*     3.1    46.4    +      -       -      +
   2037X  LEU*     3.1    31.2    +      -       +      +
   2038X  TYR*     3.6    30.4    +      -       +      -
   2040X  ARG*     3.2    24.2    -      -       -      +
   2041X  ASP*     2.6    30.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY1927 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1923X  LEU      2.6    20.9    +      -       -      -
   1924X  SER*     3.8     2.0    -      -       -      -
   1926X  LYS*     1.3    78.1    -      -       -      +
   1928X  THR*     1.3    60.3    +      -       -      +
   1929X  LEU      3.4     1.0    +      -       -      -
   1930X  GLN*     3.5    17.1    +      -       -      +
   1931X  LYS      4.9     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR1928 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1717X  GLN*     3.7    38.6    +      -       +      +
   1924X  SER*     2.9    23.1    +      -       -      -
   1925X  MET*     3.7     7.0    -      -       -      +
   1927X  GLY*     1.3    75.2    -      -       -      +
   1929X  LEU*     1.3    64.7    +      -       +      +
   1930X  GLN      3.5     0.4    +      -       -      -
   1931X  LYS*     5.1     2.6    +      -       -      +
   1932X  PHE*     4.3    11.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU1929 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1710X  LEU*     4.7     6.7    -      -       +      -
   1713X  GLY      3.9    10.1    -      -       -      +
   1714X  ILE*     3.7    47.3    -      -       +      +
   1717X  GLN*     4.8     3.6    -      -       +      -
   1734X  LEU*     4.5     8.1    -      -       +      -
   1925X  MET*     3.0    44.4    +      -       +      +
   1926X  LYS*     3.1     3.3    +      -       -      +
   1928X  THR*     1.3    86.5    -      -       +      +
   1930X  GLN*     1.3    59.4    +      -       -      +
   1931X  LYS      3.4     1.8    -      -       -      -
   1932X  PHE*     3.0    36.8    +      -       +      +
   1933X  VAL*     3.1    17.6    +      -       +      +
   2008X  VAL*     4.3     9.4    -      -       +      -
   2012X  ILE*     5.0     1.8    -      -       +      -
   2038X  TYR*     5.6     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN1930 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1926X  LYS*     3.1    31.5    +      -       -      +
   1927X  GLY*     3.5    15.4    +      -       -      +
   1928X  THR      3.5     0.2    -      -       -      -
   1929X  LEU*     1.3    74.2    -      -       -      +
   1931X  LYS*     1.3    61.0    +      -       -      +
   1933X  VAL*     4.1     5.9    -      -       -      +
   1934X  ASP*     2.8    53.3    +      -       -      +
   2038X  TYR*     3.4    24.2    +      -       -      -
   2041X  ASP*     3.2    21.6    +      -       -      +
   2045X  TYR*     2.8    29.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS1931 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1927X  GLY      4.9     1.2    +      -       -      -
   1928X  THR      5.1     2.0    +      -       -      +
   1929X  LEU      3.4     0.4    -      -       -      -
   1930X  GLN*     1.3    76.5    -      -       -      +
   1932X  PHE*     1.3    68.9    +      -       +      +
   1934X  ASP*     3.7     7.5    -      -       +      +
   1935X  ASP*     2.7    74.0    +      -       -      +
   1938X  GLN*     5.2     0.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE1932 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18X  UNX      2.7    30.1    -      -       -      -
   1706X  PRO      4.5     0.5    -      -       -      +
   1709X  MET*     3.9    40.8    -      -       +      -
   1710X  LEU*     3.7    23.0    -      -       +      +
   1713X  GLY*     4.0    21.1    -      -       -      -
   1928X  THR*     4.3    11.0    -      -       +      -
   1929X  LEU*     3.0    32.5    +      -       +      +
   1931X  LYS*     1.3    86.8    -      -       +      +
   1933X  VAL*     1.3    60.1    +      -       -      +
   1935X  ASP*     4.6     1.8    -      -       -      -
   1936X  LEU*     3.2    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL1933 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1710X  LEU*     4.2    18.4    -      -       +      -
   1929X  LEU*     3.1    18.2    +      -       +      +
   1930X  GLN*     3.7    14.6    -      -       -      +
   1932X  PHE*     1.3    74.7    -      -       -      +
   1934X  ASP*     1.3    56.0    -      -       -      +
   1936X  LEU*     3.1     5.1    +      -       -      +
   1937X  PHE*     2.9    60.8    +      -       +      -
   2012X  ILE*     4.2    24.2    -      -       +      -
   2038X  TYR*     4.3    16.4    -      -       +      +
   2045X  TYR*     3.7    17.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP1934 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1930X  GLN*     2.8    39.7    +      -       -      +
   1931X  LYS*     3.7     8.1    -      -       +      +
   1933X  VAL*     1.3    70.0    -      -       -      +
   1935X  ASP*     1.3    61.4    +      -       -      +
   1937X  PHE*     4.1     2.9    -      -       -      +
   1938X  GLN*     2.9    50.2    +      -       -      +
   2044X  ARG*     3.3    24.6    +      -       -      +
   2045X  TYR*     2.7    31.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP1935 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18X  UNX      3.7    13.5    -      -       -      -
   1706X  PRO*     4.1     7.0    -      -       +      +
   1931X  LYS*     2.7    64.1    +      -       -      +
   1932X  PHE*     4.9     2.1    -      -       -      -
   1934X  ASP*     1.3    77.5    -      -       -      +
   1936X  LEU*     1.3    60.3    +      -       -      +
   1938X  GLN*     3.3    17.9    -      -       -      +
   1939X  VAL*     3.2    32.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU1936 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18X  UNX      4.4     0.9    -      -       -      -
   1703X  VAL*     3.6    30.1    -      -       +      +
   1706X  PRO*     3.9    12.1    -      -       +      +
   1707X  LEU*     3.7    36.1    -      -       +      +
   1710X  LEU*     3.7    28.7    -      -       +      -
   1932X  PHE      3.2    16.8    +      -       -      +
   1933X  VAL      3.1     4.7    +      -       -      +
   1935X  ASP*     1.3    76.5    -      -       -      +
   1937X  PHE*     1.3    76.5    +      -       +      +
   1939X  VAL*     3.4     2.4    +      -       -      +
   1940X  ILE*     3.1    33.1    +      -       +      +
   1990X  ILE*     4.4    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE1937 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1933X  VAL*     2.9    25.8    +      -       +      +
   1934X  ASP      4.1     2.5    -      -       -      +
   1936X  LEU*     1.3    82.4    -      -       +      +
   1938X  GLN*     1.3    67.0    +      -       -      +
   1940X  ILE*     3.2     5.6    +      -       +      -
   1941X  LEU*     3.0    30.9    +      -       +      +
   1990X  ILE*     4.4     8.7    -      -       +      -
   2012X  ILE*     3.6    44.0    -      -       +      -
   2015X  THR*     4.1     5.6    -      -       +      -
   2016X  PHE*     3.7    44.2    -      +       +      -
   2045X  TYR*     3.5    57.9    -      +       +      -
   2048X  MET*     4.1     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN1938 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1931X  LYS*     5.2     0.2    +      -       -      -
   1934X  ASP*     2.9    29.1    +      -       -      +
   1935X  ASP*     3.3    25.3    -      -       -      +
   1937X  PHE*     1.3    75.0    -      -       -      +
   1939X  VAL*     1.3    59.4    +      -       +      +
   1941X  LEU      3.5     0.9    -      -       -      -
   1942X  SER*     2.8    34.5    +      -       -      -
   2044X  ARG*     3.9    19.7    -      -       -      +
   2048X  MET*     3.7    22.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL1939 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1698X  PHE*     4.3    11.6    -      -       +      -
   1702X  SER*     3.7    39.3    -      -       -      +
   1703X  VAL*     4.1    10.3    -      -       +      -
   1706X  PRO*     4.1    15.5    -      -       +      -
   1935X  ASP*     3.2    20.3    +      -       +      +
   1936X  LEU      3.4     4.0    +      -       -      +
   1937X  PHE      3.3     0.2    -      -       -      -
   1938X  GLN*     1.3    75.0    -      -       +      +
   1940X  ILE*     1.3    65.7    +      -       -      +
   1942X  SER*     3.6    14.7    +      -       -      -
   1945X  ARG*     4.3    22.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1940 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1698X  PHE*     5.1     4.3    -      -       -      -
   1703X  VAL*     3.9    16.6    -      -       +      -
   1707X  LEU*     6.2     0.2    -      -       +      -
   1936X  LEU*     3.1    37.9    +      -       +      +
   1937X  PHE*     3.2     4.0    +      -       +      +
   1939X  VAL*     1.3    76.7    -      -       -      +
   1941X  LEU*     1.3    63.4    +      -       +      +
   1942X  SER      3.8     0.3    +      -       -      -
   1986X  TRP*     3.4    68.2    +      -       +      +
   1990X  ILE*     4.5    11.4    -      -       +      -
   2016X  PHE*     3.9    24.7    -      -       +      -
   2052X  TYR*     3.7    19.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU1941 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1937X  PHE*     3.0    21.4    +      -       +      +
   1938X  GLN      3.5     1.6    -      -       -      -
   1940X  ILE*     1.3    80.8    -      -       +      +
   1942X  SER*     1.3    63.1    +      -       -      +
   1943X  THR*     3.7     4.0    +      -       -      -
   1982X  PRO*     5.5     4.3    -      -       +      -
   1986X  TRP*     6.1     0.2    -      -       +      -
   2016X  PHE*     4.2    33.0    -      -       +      -
   2019X  ALA*     5.7     0.4    -      -       +      -
   2020X  CYS*     5.4     1.8    -      -       -      -
   2045X  TYR*     4.3     6.3    -      -       +      +
   2048X  MET*     4.0    37.6    -      -       +      +
   2049X  VAL*     4.0    27.6    -      -       +      -
   2051X  ARG*     6.0     0.2    -      -       -      +
   2052X  TYR*     3.4    48.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER1942 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1938X  GLN      2.8    22.7    +      -       -      -
   1939X  VAL*     3.6    10.0    +      -       -      -
   1940X  ILE      3.5     3.0    +      -       -      -
   1941X  LEU*     1.3    75.3    -      -       -      +
   1943X  THR*     1.3    57.7    +      -       -      +
   1944X  SER*     2.4    34.2    +      -       -      -
   1945X  ARG*     3.6    27.2    +      -       -      +
   1947X  VAL*     5.7     2.8    -      -       -      +
   2052X  TYR*     4.0    11.8    -      -       -      -
   2055X  ASP*     4.7     1.9    -      -       -      +
----------------------------------------------------------
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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