Contacts of the helix formed by residues 10 - 36 (chain C) in PDB entry 1IES


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 THR 10 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5C  ARG*     4.1    14.4    -      -       -      +
      9C  SER*     1.3    70.1    -      -       -      +
     11C  GLU*     1.3    75.8    +      -       -      +
     13C  GLU*     3.6     8.0    -      -       -      +
     14C  ALA*     2.8    29.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 11 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9C  SER*     3.5    16.6    -      -       -      +
     10C  THR*     1.3    87.0    +      -       -      +
     12C  VAL*     1.3    57.4    +      -       -      +
     14C  ALA*     3.5     4.8    +      -       -      +
     15C  ALA*     3.0    28.6    +      -       -      +
    116C  LEU*     3.6    26.3    -      -       +      +
    120C  GLN*     3.0    26.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 12 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8C  TYR*     3.6    24.2    -      -       +      -
      9C  SER*     3.4    22.2    +      -       -      +
     10C  THR      3.2     0.4    -      -       -      -
     11C  GLU*     1.3    74.6    -      -       -      +
     13C  GLU*     1.3    66.0    +      -       -      +
     15C  ALA*     3.2     1.0    +      -       -      +
     16C  VAL*     2.8    26.0    +      -       +      +
    113C  LEU*     4.3     2.0    -      -       +      -
    116C  LEU*     3.7    20.0    -      -       +      -
    117C  GLY*     4.3     7.0    -      -       -      -
    120C  GLN*     4.2    12.3    -      -       +      -
    122C  ASP*     4.3     5.6    -      -       -      +
    125C  LEU*     3.6    39.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 13 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5C  ARG*     2.7    39.7    +      -       -      -
      8C  TYR*     3.9    17.2    -      -       +      -
      9C  SER      2.9    17.1    +      -       -      +
     10C  THR*     3.1    12.2    +      -       -      +
     12C  VAL*     1.3    73.8    -      -       -      +
     14C  ALA*     1.3    62.4    +      -       -      +
     16C  VAL      3.4     0.2    +      -       -      -
     17C  ASN*     3.2    22.1    +      -       -      +
     69C  GLN*     3.2    29.1    +      -       -      +
     74C  GLY*     3.6     3.7    -      -       -      -
     75C  ARG*     3.0    34.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 14 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10C  THR      2.8    17.2    +      -       -      +
     11C  GLU*     3.6     5.2    -      -       -      +
     13C  GLU*     1.3    79.7    -      -       -      +
     15C  ALA*     1.3    60.1    +      -       -      +
     17C  ASN*     3.5    10.1    +      -       -      +
     18C  ARG*     3.3    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 15 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11C  GLU      3.0    19.7    +      -       -      +
     12C  VAL      3.2     1.3    +      -       -      +
     14C  ALA*     1.3    74.4    -      -       -      +
     16C  VAL*     1.3    64.3    +      -       -      +
     18C  ARG*     3.3    12.7    +      -       -      +
     19C  LEU*     3.0    22.7    +      -       -      +
    113C  LEU*     3.5    29.0    -      -       +      +
    116C  LEU*     3.8     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 16 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8C  TYR*     3.6    13.5    -      -       -      +
     12C  VAL*     2.8    32.4    +      -       +      +
     13C  GLU      3.8     4.3    -      -       -      +
     15C  ALA*     1.3    69.5    -      -       -      +
     17C  ASN*     1.3    58.2    +      -       -      +
     19C  LEU*     3.0     8.7    +      -       -      +
     20C  VAL*     2.8    34.7    +      -       +      +
     65C  LEU*     4.0    29.6    -      -       +      +
     68C  MET*     3.9    22.9    -      -       +      -
     69C  GLN*     3.8    21.1    -      -       +      +
    113C  LEU*     4.3    14.4    -      -       +      -
    125C  LEU*     4.3     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 17 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13C  GLU*     3.2    16.0    +      -       -      +
     14C  ALA*     3.6    12.5    -      -       -      +
     15C  ALA      3.3     0.2    -      -       -      -
     16C  VAL*     1.3    77.5    -      -       -      +
     18C  ARG*     1.3    58.2    +      -       -      +
     20C  VAL*     3.5    12.3    -      -       -      +
     21C  ASN*     3.4    14.0    +      -       -      +
     66C  LEU*     5.0     1.2    -      -       -      +
     69C  GLN*     3.0    19.8    +      -       -      +
     75C  ARG      2.9    23.8    +      -       -      -
     76C  ALA*     3.2     7.1    -      -       -      +
     77C  LEU*     3.1    45.4    +      -       +      +
     79C  GLN*     3.8    13.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 18 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  ALA      3.3    13.0    +      -       -      +
     15C  ALA*     3.8    10.9    +      -       -      +
     16C  VAL      3.2     0.6    -      -       -      -
     17C  ASN*     1.3    76.8    -      -       -      +
     19C  LEU*     1.3    62.8    +      -       -      +
     21C  ASN*     3.1     7.0    +      -       +      +
     22C  LEU*     3.0    61.7    +      -       +      +
     79C  GLN*     4.2    16.8    -      -       -      +
    109C  ALA*     4.7    17.1    +      -       -      +
    112C  ASP*     5.4     6.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 19 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  ALA      3.0    12.7    +      -       -      +
     16C  VAL*     3.0    10.2    +      -       -      +
     18C  ARG*     1.3    75.8    -      -       -      +
     20C  VAL*     1.3    65.1    +      -       -      +
     22C  LEU*     3.3    10.1    +      -       +      +
     23C  TYR*     2.9    44.6    +      -       +      -
     65C  LEU*     3.9    24.5    -      -       +      -
    106C  LEU*     4.8     1.3    -      -       +      +
    109C  ALA*     3.5    34.1    -      -       +      +
    110C  LEU*     3.7    25.8    -      -       +      +
    113C  LEU*     3.5    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 20 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16C  VAL*     2.8    23.8    +      -       +      +
     17C  ASN*     3.5    13.0    -      -       -      +
     19C  LEU*     1.3    76.5    -      -       -      +
     21C  ASN*     1.3    62.0    +      -       -      +
     23C  TYR*     3.4     4.2    +      -       -      +
     24C  LEU*     3.0    41.7    +      -       +      +
     62C  ALA*     4.1     5.8    -      -       +      +
     65C  LEU*     3.8    28.0    -      -       +      +
     66C  LEU*     3.6    41.1    -      -       +      +
     77C  LEU      5.8     1.3    -      -       -      +
     78C  PHE*     4.3     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 21 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17C  ASN      3.4     7.8    +      -       -      +
     18C  ARG*     3.1    11.5    +      -       +      +
     20C  VAL*     1.3    79.8    -      -       -      +
     22C  LEU*     1.3    62.2    +      -       +      +
     24C  LEU*     3.2     7.8    +      -       -      +
     25C  ARG*     2.8    34.7    +      -       -      +
     79C  GLN*     3.4    43.0    +      -       -      +
     80C  ASP      3.1    26.7    +      -       -      +
     81C  LEU*     3.8    10.8    -      -       -      +
     82C  GLN      5.6     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 22 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  ARG*     3.0    47.0    +      -       +      +
     19C  LEU*     3.3    13.7    +      -       +      +
     21C  ASN*     1.3    79.2    -      -       -      +
     23C  TYR*     1.3    56.2    +      -       -      +
     25C  ARG*     3.3     5.9    +      -       -      +
     26C  ALA*     2.8    30.5    +      -       -      +
    105C  SER*     4.8     6.5    -      -       -      +
    106C  LEU*     3.9    20.1    -      -       +      +
    109C  ALA*     3.7    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 23 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19C  LEU*     2.9    44.4    +      -       +      +
     20C  VAL      3.9     0.2    -      -       -      +
     22C  LEU*     1.3    76.2    -      -       -      +
     24C  LEU*     1.3    58.7    +      -       -      +
     26C  ALA*     3.1     7.5    +      -       -      +
     27C  SER*     2.9    28.8    +      -       -      -
     57C  GLU      5.4     0.2    -      -       -      -
     58C  LYS*     3.5    47.9    -      -       +      +
     61C  GLY*     3.9     5.6    -      -       -      -
     62C  ALA*     3.8    28.5    -      -       +      -
     65C  LEU*     4.2     6.3    -      -       +      -
    106C  LEU*     4.0    19.6    -      -       +      +
    110C  LEU*     3.7    13.7    -      -       +      +
    133C  PHE*     3.3    33.2    -      +       -      -
    136C  GLU*     5.5     4.3    +      -       -      -
    137C  GLU*     3.7    16.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 24 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  VAL*     3.0    36.0    +      -       +      +
     21C  ASN*     3.5     4.5    -      -       -      +
     23C  TYR*     1.3    75.7    -      -       -      +
     25C  ARG*     1.3    57.6    +      -       -      +
     27C  SER*     3.0     8.8    -      -       -      -
     28C  TYR*     2.9    26.5    +      -       -      +
     59C  ARG*     4.6    17.3    -      -       +      +
     62C  ALA*     3.4    22.7    -      -       +      -
     63C  GLU*     6.2     0.9    -      -       +      -
     66C  LEU*     5.2     2.7    -      -       +      -
     78C  PHE*     4.6    16.4    -      -       +      -
     81C  LEU*     3.9    29.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 25 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  ASN*     2.8    25.1    +      -       -      +
     22C  LEU*     3.7     6.1    -      -       -      +
     24C  LEU*     1.3    77.3    -      -       -      +
     26C  ALA*     1.3    55.5    +      -       -      +
     28C  TYR*     3.2     6.1    +      -       +      +
     29C  THR*     2.9    41.2    +      -       -      +
     81C  LEU*     4.4     8.0    -      -       +      +
     82C  GLN*     3.5    57.3    +      -       -      +
     83C  LYS      3.1    21.3    +      -       -      -
     85C  SER*     3.6    23.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 26 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22C  LEU      2.8    18.3    +      -       -      +
     23C  TYR      3.5     7.4    -      -       -      +
     25C  ARG*     1.3    69.4    -      -       -      +
     27C  SER*     1.3    58.6    +      -       -      +
     29C  THR*     3.1     4.5    +      -       -      -
     30C  TYR*     2.9    36.6    +      -       +      -
     58C  LYS*     4.0     9.4    -      -       +      -
    102C  LEU*     4.1    24.4    -      -       +      +
    106C  LEU*     3.9    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 27 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23C  TYR      2.9    12.6    +      -       -      -
     24C  LEU*     3.0    19.1    -      -       -      -
     26C  ALA*     1.3    76.8    -      -       -      +
     28C  TYR*     1.3    54.5    +      -       -      +
     30C  TYR      3.3     0.5    +      -       -      -
     31C  LEU*     3.0    25.0    +      -       -      +
     55C  ALA*     3.0    33.2    +      -       -      +
     58C  LYS*     3.8    14.9    -      -       -      +
     59C  ARG*     3.5    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 28 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24C  LEU      2.9    12.6    +      -       -      +
     25C  ARG*     3.2     9.2    +      -       +      +
     27C  SER*     1.3    72.3    -      -       -      +
     29C  THR*     1.3    65.7    +      -       -      +
     31C  LEU*     3.3    24.0    +      -       +      +
     32C  SER*     3.1    18.4    +      -       -      -
     81C  LEU*     4.3    22.4    -      -       +      -
     82C  GLN      3.5    19.1    -      -       -      -
     83C  LYS*     3.7    24.5    -      -       +      +
     84C  PRO*     3.7    18.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 29 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25C  ARG*     2.9    22.1    +      -       -      -
     26C  ALA*     3.3    10.4    -      -       -      -
     28C  TYR*     1.3    75.3    -      -       -      +
     30C  TYR*     1.3    63.5    +      -       -      +
     32C  SER*     3.1     6.4    +      -       -      -
     33C  LEU*     3.0    28.9    +      -       +      +
     84C  PRO*     3.7    23.5    -      -       +      +
     85C  SER*     5.0     2.5    +      -       -      +
     89C  TRP*     4.1    24.5    -      -       +      -
    102C  LEU*     3.8    25.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 30 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26C  ALA*     2.9    28.3    +      -       +      +
     27C  SER      3.7     2.0    -      -       -      +
     29C  THR*     1.3    71.2    -      -       -      +
     31C  LEU*     1.3    62.5    +      -       -      +
     33C  LEU*     3.6    16.7    -      -       +      +
     34C  GLY*     2.8    22.3    +      -       -      -
     51C  PHE*     3.5    53.5    -      +       -      +
     52C  ARG      4.7     0.3    +      -       -      -
     54C  LEU*     3.8    26.5    -      -       +      -
     55C  ALA*     3.7    10.1    -      -       -      +
     58C  LYS*     4.1    15.9    -      -       +      -
     99C  ALA*     3.6    14.9    +      -       +      -
    102C  LEU*     3.7    18.3    -      -       +      +
    103C  GLU*     2.6    40.3    +      -       -      +
    144C  MET*     3.7     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 31 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27C  SER      3.0    13.2    +      -       -      +
     28C  TYR*     3.3    31.4    +      -       +      +
     30C  TYR*     1.3    74.1    -      -       -      +
     32C  SER*     1.3    64.1    +      -       -      +
     34C  GLY*     3.9     0.8    -      -       -      -
     35C  PHE*     3.0    56.5    +      -       +      +
     52C  ARG*     4.8    11.4    -      -       -      +
     55C  ALA*     3.9    13.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 32 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28C  TYR*     3.1     9.1    +      -       -      -
     29C  THR      3.1    10.6    +      -       -      -
     31C  LEU*     1.3    82.4    -      -       -      +
     33C  LEU*     1.3    59.0    +      -       -      +
     35C  PHE*     3.6     4.0    +      -       -      +
     36C  TYR*     3.1    24.1    +      -       -      +
     84C  PRO*     3.8    16.1    -      -       -      +
     86C  GLN      3.9     6.4    +      -       -      -
     87C  ASP*     4.9     4.2    +      -       -      -
     89C  TRP*     3.1    21.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 33 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29C  THR*     3.0    23.9    +      -       +      +
     30C  TYR*     3.6    37.0    -      -       +      +
     32C  SER*     1.3    70.8    +      -       -      +
     34C  GLY*     1.3    65.5    +      -       -      +
     36C  TYR*     3.1     7.6    +      -       -      +
     37C  PHE*     3.1    26.6    +      -       +      -
     51C  PHE*     3.8    20.6    -      -       +      -
     89C  TRP*     3.5    49.1    -      -       +      -
     95C  ALA*     3.8    25.6    -      -       +      +
     98C  ALA*     5.4     1.3    -      -       +      -
     99C  ALA*     4.9     8.3    -      -       +      +
    102C  LEU*     5.6     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 34 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30C  TYR      2.8    20.2    +      -       -      -
     31C  LEU      3.9     0.7    -      -       -      -
     33C  LEU*     1.3    74.2    -      -       -      +
     35C  PHE*     1.3    60.7    +      -       -      +
     36C  TYR      3.2     0.7    +      -       -      -
     37C  PHE      3.4     4.2    +      -       -      -
     38C  ASP      3.5     1.2    +      -       -      -
     48C  CYS*     3.3    43.0    -      -       -      +
     51C  PHE*     3.6    15.6    -      -       -      +
     52C  ARG*     4.0     7.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 35 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31C  LEU*     3.0    45.4    +      -       +      +
     32C  SER*     4.2     3.6    -      -       -      +
     34C  GLY*     1.3    75.3    -      -       -      +
     36C  TYR*     1.3    62.1    +      -       -      +
     38C  ASP*     3.5    33.8    +      -       +      +
     39C  ARG*     3.8     8.8    +      -       -      +
     48C  CYS*     5.6     1.1    -      -       -      -
     52C  ARG*     3.4    46.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 36 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32C  SER      3.1    14.9    +      -       -      +
     33C  LEU      3.1     8.7    +      -       -      +
     35C  PHE*     1.3    74.6    -      -       -      +
     37C  PHE*     1.3    82.8    +      +       -      +
     38C  ASP      3.1     0.7    -      -       -      -
     39C  ARG*     3.0    62.4    +      -       -      +
     42C  VAL*     3.6    26.0    -      -       +      +
     87C  ASP      4.5     4.9    -      -       -      +
     88C  GLU*     3.9    18.7    +      -       +      +
     89C  TRP*     3.6    33.2    -      +       +      -
     90C  GLY*     2.9    40.7    +      -       -      -
----------------------------------------------------------
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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