Contacts of the helix formed by residues 1008 - 1031 (chain A) in PDB entry 3KSS


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 VAL1008 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  ILE*     3.9    26.0    -      -       +      -
    391A  MET*     4.5    14.4    -      -       +      -
    475A  PHE*     4.9     1.1    -      -       +      -
    478A  LEU*     4.4    20.6    -      -       +      -
    563A  PRO*     4.9     6.1    -      -       +      -
    565A  ILE*     4.5    15.0    -      -       +      -
    925A  ALA*     4.1    17.0    -      -       +      -
   1005A  GLY      4.4     8.5    -      -       -      +
   1006A  SER      2.9     0.4    -      -       -      -
   1007A  GLU*     1.3    81.3    -      -       -      +
   1009A  MET*     1.3    82.2    +      -       +      +
   1010A  SER      3.2     1.3    -      -       -      -
   1011A  ARG*     3.1    12.1    +      -       -      +
   1012A  ILE*     3.1    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET1009 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  ASN*     4.4    19.3    -      -       -      +
    338A  LEU*     4.3    17.0    -      -       +      -
    341A  LYS*     6.3     0.7    -      -       +      -
    390A  ILE*     6.0     1.8    -      -       +      -
    394A  GLY*     4.6    22.7    -      -       -      +
    397A  ALA*     4.8     9.9    -      -       -      -
    398A  ILE*     5.2     8.1    -      -       +      +
    478A  LEU*     6.4     2.0    -      -       +      -
    998A  ILE*     3.8    30.7    -      -       +      -
   1004A  ALA      5.0     0.7    -      -       -      +
   1005A  GLY      4.2     8.7    -      -       -      +
   1006A  SER*     3.0    29.9    +      -       -      +
   1008A  VAL*     1.3    91.1    -      -       +      +
   1010A  SER*     1.3    57.2    +      -       -      +
   1012A  ILE*     3.4    10.9    +      -       -      +
   1013A  ALA*     2.9    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER1010 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    918A  MET*     5.5     0.3    -      -       -      -
    920A  PHE*     3.4    25.6    -      -       -      -
    998A  ILE*     3.3    21.3    -      -       -      +
    999A  LEU*     3.5    16.5    -      -       -      +
   1006A  SER      3.4    17.4    +      -       -      -
   1007A  GLU*     5.1     1.8    -      -       -      -
   1008A  VAL      3.2     0.4    -      -       -      -
   1009A  MET*     1.3    76.5    -      -       -      +
   1011A  ARG*     1.3    57.6    +      -       -      +
   1013A  ALA*     2.7    21.1    +      -       -      -
   1014A  ALA*     2.8    18.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG1011 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    561A  PHE      2.7    28.7    +      -       -      -
    562A  LEU*     3.7     0.8    -      -       -      +
    563A  PRO*     3.3    23.9    -      -       +      +
    920A  PHE*     4.0    16.2    -      -       +      -
    921A  HIS*     2.9    41.5    +      -       -      +
    922A  LEU      2.7    25.5    +      -       -      +
    923A  SER*     3.3    28.8    +      -       -      +
    925A  ALA*     3.7     3.1    -      -       +      -
    926A  THR*     2.9    37.9    -      -       +      +
   1007A  GLU*     2.9    29.4    +      -       -      +
   1008A  VAL*     3.1     9.1    +      -       -      +
   1010A  SER*     1.3    77.3    -      -       -      +
   1012A  ILE*     1.3    57.4    +      -       -      +
   1014A  ALA*     4.7     0.2    -      -       -      +
   1015A  PRO*     3.2    12.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1012 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398A  ILE*     3.4    52.3    -      -       +      -
    475A  PHE*     4.7     2.2    -      -       +      -
    478A  LEU*     4.7     6.3    -      -       +      -
    925A  ALA*     3.0    36.3    -      -       +      +
    928A  THR*     4.0    20.0    -      -       +      +
    929A  GLY*     3.2    25.4    -      -       -      +
    932A  ALA*     6.0     2.0    -      -       +      -
   1008A  VAL*     3.1    21.5    -      -       +      +
   1009A  MET*     3.8     7.9    -      -       -      +
   1010A  SER      3.1     0.2    -      -       -      -
   1011A  ARG*     1.3    75.6    -      -       -      +
   1013A  ALA*     1.3    66.7    +      -       -      +
   1015A  PRO*     3.9     3.6    -      -       -      +
   1016A  MET*     4.1     9.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA1013 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398A  ILE*     5.8     3.4    -      -       +      -
    995A  LEU*     3.3    29.9    -      -       +      +
    998A  ILE*     4.1    17.3    -      -       +      -
    999A  LEU*     4.7     3.8    -      -       +      -
   1009A  MET      2.9    18.5    +      -       -      +
   1010A  SER*     2.7    11.2    +      -       -      +
   1012A  ILE*     1.3    81.9    -      -       +      +
   1014A  ALA*     1.3    66.5    +      -       -      +
   1016A  MET*     3.1    21.6    +      -       -      +
   1017A  ILE*     4.4     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA1014 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    911A  GLY      4.6     0.4    -      -       -      -
    914A  LEU*     2.8    42.2    -      -       +      +
    915A  LEU*     5.0     5.2    -      -       +      -
    918A  MET*     4.5    16.6    -      -       +      -
    920A  PHE*     4.7    11.2    -      -       +      -
    926A  THR*     6.4     0.2    -      -       +      -
    999A  LEU*     5.2     6.8    -      -       +      +
   1010A  SER*     2.8    17.7    +      -       -      +
   1011A  ARG      4.7     0.9    -      -       -      +
   1013A  ALA*     1.3    71.6    -      -       -      +
   1015A  PRO*     1.3    74.6    -      -       +      +
   1016A  MET      2.9     1.4    +      -       -      -
   1017A  ILE*     2.9    10.6    +      -       -      -
   1018A  GLY      3.4     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO1015 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    911A  GLY*     3.3    16.2    -      -       -      +
    915A  LEU*     4.9     6.5    -      -       +      -
    926A  THR*     3.5    17.0    -      -       -      +
    929A  GLY*     4.1     2.9    -      -       -      -
    930A  PHE*     3.1    48.2    -      -       +      +
    933A  LEU*     3.0    10.8    -      -       +      +
   1011A  ARG      3.2    17.7    -      -       -      +
   1012A  ILE      3.9     2.5    -      -       -      +
   1013A  ALA      3.7     2.0    -      -       -      -
   1014A  ALA*     1.3    96.3    -      -       +      +
   1016A  MET*     1.3    61.4    +      -       -      +
   1019A  GLY      2.9    21.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET1016 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398A  ILE*     5.6    14.1    -      -       -      +
    401A  GLY      6.3     1.6    -      -       -      -
    402A  ALA*     5.6     7.0    -      -       -      -
    929A  GLY*     2.8    41.1    -      -       -      +
    932A  ALA*     3.5    16.8    -      -       +      -
    933A  LEU*     3.2    22.9    -      -       -      +
    936A  VAL*     6.0     4.3    -      -       +      -
    991A  ILE*     4.3    12.8    -      -       +      -
    995A  LEU*     3.1    33.7    -      -       +      -
   1012A  ILE*     4.1     4.5    +      -       -      +
   1013A  ALA*     3.1     8.9    +      -       -      +
   1014A  ALA      3.0     0.4    -      -       -      -
   1015A  PRO*     1.3    80.5    -      -       -      +
   1017A  ILE*     1.3    54.2    +      -       -      +
   1019A  GLY*     3.6     1.2    -      -       -      -
   1020A  MET*     2.8    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1017 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    914A  LEU*     3.9    16.8    -      -       +      -
    992A  ILE*     3.6    44.7    -      -       +      +
    995A  LEU*     3.2    39.5    -      -       +      +
    996A  LEU*     4.2     3.4    -      -       +      +
    999A  LEU*     4.0    20.6    -      -       +      -
   1013A  ALA      4.4     1.3    -      -       -      +
   1014A  ALA*     2.9     9.6    +      -       -      +
   1016A  MET*     1.3    76.5    -      -       -      +
   1018A  GLY*     1.3    61.4    +      -       -      +
   1020A  MET*     2.7    21.5    +      -       -      +
   1021A  ILE*     2.9    14.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY1018 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    910A  GLY*     3.0    36.0    -      -       -      -
    911A  GLY*     3.1     8.5    -      -       -      -
    914A  LEU*     3.7     6.2    -      -       -      +
   1014A  ALA      3.4     7.1    +      -       -      -
   1017A  ILE*     1.3    81.1    -      -       -      +
   1019A  GLY*     1.3    62.5    +      -       -      +
   1021A  ILE*     3.1    22.6    +      -       -      +
   1022A  THR      3.2     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY1019 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    907A  ALA      3.1    23.7    -      -       -      +
    911A  GLY      3.1     4.3    -      -       -      +
    933A  LEU*     3.3    21.3    -      -       -      -
   1015A  PRO      2.9    10.7    +      -       -      -
   1016A  MET      3.6     1.1    -      -       -      -
   1018A  GLY*     1.3    75.3    -      -       -      +
   1020A  MET*     1.3    49.5    +      -       -      +
   1021A  ILE      3.2     0.4    -      -       -      -
   1023A  ALA*     2.5    43.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET1020 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    936A  VAL*     4.0    22.9    -      -       +      -
    940A  PHE*     3.5    39.3    -      -       +      -
    987A  THR*     4.2     5.6    -      -       -      +
    988A  VAL*     3.3    23.6    -      -       +      +
    991A  ILE*     3.2    50.0    -      -       +      -
    992A  ILE*     3.6    11.4    -      -       +      +
   1016A  MET*     2.8    19.3    +      -       -      +
   1017A  ILE      2.7    13.8    +      -       -      +
   1019A  GLY*     1.3    72.0    -      -       -      +
   1021A  ILE*     1.3    56.4    +      -       -      -
   1023A  ALA*     4.4     5.2    -      -       -      -
   1024A  PRO*     3.0    22.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1021 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    910A  GLY*     4.6     4.3    -      -       -      -
    988A  VAL*     5.4     3.8    -      -       +      -
    992A  ILE*     4.7    15.7    -      -       +      -
   1017A  ILE*     2.9    10.8    +      -       +      +
   1018A  GLY*     3.1    18.1    +      -       -      +
   1020A  MET*     1.3    82.3    -      -       -      +
   1022A  THR*     1.3    72.7    +      -       -      +
   1024A  PRO*     3.6     7.2    -      -       -      +
   1025A  LEU*     4.0    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR1022 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    906A  PHE*     3.0    31.0    -      -       +      +
    907A  ALA*     3.5    17.0    -      -       -      -
    909A  VAL*     4.4     4.6    -      -       +      +
    910A  GLY*     3.3    21.4    +      -       -      +
   1018A  GLY      3.2     6.9    +      -       -      -
   1021A  ILE*     1.3    85.3    -      -       -      +
   1023A  ALA*     1.3    53.1    +      -       -      +
   1024A  PRO*     3.4     0.9    -      -       -      -
   1025A  LEU*     3.4    13.3    +      -       +      +
   1026A  LEU*     2.8    35.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA1023 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    907A  ALA*     4.5     3.4    -      -       +      -
    933A  LEU*     5.5     0.9    -      -       +      -
    936A  VAL*     5.2     2.0    -      -       +      -
    937A  ALA*     4.2    17.7    -      -       +      +
    940A  PHE*     4.4     7.4    -      -       +      -
   1019A  GLY      2.5    24.5    +      -       -      +
   1020A  MET*     4.2    13.2    -      -       -      -
   1022A  THR*     1.3    70.5    -      -       -      +
   1024A  PRO*     1.3    69.4    -      -       +      +
   1026A  LEU*     2.6    33.8    -      -       +      +
   1027A  SER*     2.7    13.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO1024 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    940A  PHE*     4.9     4.7    -      -       +      -
    980A  ARG*     4.1     5.0    +      -       -      +
    984A  LYS*     5.3     7.2    -      -       +      -
    988A  VAL*     3.3    32.5    -      -       +      -
   1020A  MET*     3.0    30.1    -      -       -      +
   1021A  ILE*     3.6     6.1    -      -       -      +
   1022A  THR      3.4     4.5    -      -       -      -
   1023A  ALA*     1.3    93.6    -      -       +      +
   1025A  LEU*     1.3    62.7    +      -       -      +
   1027A  SER*     3.3     7.6    +      -       -      +
   1028A  LEU*     3.0    32.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU1025 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1021A  ILE      4.0    12.6    -      -       -      +
   1022A  THR*     3.4    15.9    +      -       +      +
   1024A  PRO*     1.3    81.2    -      -       -      +
   1026A  LEU*     1.3    70.6    +      -       +      +
   1028A  LEU*     3.1    26.9    -      -       -      +
   1029A  PHE*     3.1    32.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU1026 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    903A  SER*     3.8     3.1    -      -       -      +
    906A  PHE*     3.2    42.0    -      -       +      -
    907A  ALA*     3.7    13.5    -      -       +      -
    937A  ALA*     4.3    10.3    -      -       +      +
   1022A  THR*     2.8    18.6    +      -       +      +
   1023A  ALA*     2.6    48.5    -      -       +      +
   1024A  PRO      3.2     0.2    -      -       -      -
   1025A  LEU*     1.3    77.9    -      -       +      +
   1027A  SER*     1.3    74.4    +      -       -      +
   1028A  LEU      2.9     2.3    +      -       -      -
   1029A  PHE*     2.9     2.0    +      -       -      +
   1030A  ILE*     2.8    55.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER1027 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    937A  ALA      4.3     0.3    +      -       -      -
    940A  PHE*     3.0    37.7    -      -       -      +
    941A  GLY*     4.1     1.7    +      -       -      -
    944A  MET*     5.2     0.2    -      -       -      -
    980A  ARG*     3.4    26.1    +      -       -      -
   1023A  ALA      2.7    21.8    +      -       -      -
   1024A  PRO*     3.6     1.6    -      -       -      -
   1026A  LEU*     1.3    89.6    -      -       -      +
   1028A  LEU*     1.3    57.4    +      -       -      +
   1030A  ILE*     3.9     5.6    -      -       -      -
   1031A  ILE*     3.1    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1028 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    525A  TYR*     3.0    54.2    +      -       +      +
    944A  MET*     6.2     0.2    -      -       -      +
    980A  ARG*     3.0    42.4    -      -       -      +
    981A  VAL*     4.7     2.9    -      -       +      -
   1024A  PRO*     3.0    21.2    +      -       +      +
   1025A  LEU*     3.1    19.5    -      -       -      +
   1026A  LEU      2.9     0.2    -      -       -      -
   1027A  SER*     1.3    79.7    -      -       -      +
   1029A  PHE*     1.3    76.9    +      -       +      +
   1030A  ILE      3.6     0.2    -      -       -      -
   1031A  ILE*     4.1     2.1    -      -       -      +
   1032A  PRO*     3.0    23.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE1029 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    525A  TYR*     4.1    18.6    -      +       -      -
    528A  LEU*     4.8    13.2    -      -       +      -
    529A  LEU*     5.0     5.4    -      -       -      -
    532A  VAL*     4.5    38.6    -      -       +      -
    539A  THR*     4.8    12.9    +      -       +      -
   1025A  LEU*     3.1    35.8    +      -       +      +
   1026A  LEU*     2.9     4.8    +      -       -      +
   1028A  LEU*     1.3   105.0    -      -       +      +
   1030A  ILE*     1.3    63.5    +      -       -      +
   1031A  ILE      3.4     1.1    -      -       -      -
   1032A  PRO*     3.5     9.0    -      -       +      -
   1033A  ALA*     3.8    18.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE1030 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    899A  LEU*     3.4    39.4    -      -       +      +
    900A  ILE*     5.7     0.7    -      -       +      -
    903A  SER*     3.9     6.7    -      -       -      +
    906A  PHE*     3.3    37.5    -      -       +      -
    941A  GLY*     4.6    16.6    -      -       -      -
    945A  LEU*     5.8     0.5    -      -       -      +
   1026A  LEU*     2.8    41.6    +      -       +      +
   1027A  SER*     3.8     9.2    -      -       -      +
   1029A  PHE*     1.3    80.4    -      -       -      +
   1031A  ILE*     1.3    69.8    +      -       +      +
   1032A  PRO      3.6     0.4    -      -       -      -
   1034A  ALA*     3.0    31.3    -      -       +      +
   1035A  TYR      4.2     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE1031 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    899A  LEU*     6.1     0.2    -      -       +      -
    941A  GLY*     3.9     5.6    -      -       -      +
    944A  MET*     3.2    31.6    -      -       +      -
    945A  LEU*     3.3    54.5    -      -       +      +
    948A  LEU*     3.2    24.3    -      -       +      +
    973A  LEU*     5.9     1.6    -      -       +      -
   1027A  SER      3.1    22.0    -      -       -      +
   1028A  LEU      4.1     2.2    -      -       -      +
   1030A  ILE*     1.3    90.7    -      -       +      +
   1032A  PRO*     1.3    70.5    -      -       +      +
   1035A  TYR*     3.1    26.0    -      -       -      +
----------------------------------------------------------
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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