Contacts of the helix formed by residues 71 - 96 (chain C) in PDB entry 2OB1


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 PHE 71 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ARG*     4.4     0.9    -      -       -      +
     69C  SER      4.1     8.3    -      -       -      +
     70C  SER*     1.3    74.8    -      -       -      +
     72C  PRO*     1.3    77.6    -      -       +      +
     73C  VAL*     3.6    32.5    -      -       +      -
     74C  MET*     3.0    56.2    +      -       +      +
     75C  ASN*     3.0    16.3    +      -       -      -
    317C  MET*     6.3     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 72 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ARG*     4.3     8.5    -      -       -      +
     24C  TYR*     4.0     4.9    -      -       -      +
     71C  PHE*     1.3    86.5    -      -       +      +
     73C  VAL*     1.3    64.4    +      -       +      +
     75C  ASN*     3.1     2.9    +      -       -      +
     76C  TYR*     2.9    30.4    +      -       +      -
    306C  GLN*     3.3    38.8    -      -       +      +
    307C  PHE      3.5    28.5    -      -       -      +
    308C  LEU*     4.5     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 73 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71C  PHE*     3.2    21.5    +      -       +      -
     72C  PRO*     1.3    76.6    -      -       +      +
     74C  MET*     1.3    57.2    +      -       -      +
     76C  TYR*     3.5     3.6    +      -       -      +
     77C  GLY*     3.0    23.4    +      -       -      -
    308C  LEU*     3.5    26.2    -      -       +      -
    310C  GLU*     4.5     6.3    -      -       +      +
    313C  GLU*     4.3    11.2    -      -       +      +
    314C  LEU*     3.8    37.4    -      -       +      +
    317C  MET*     4.2    23.1    -      -       +      -
    318C  GLN*     4.7     1.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 74 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  CYS*     5.0    19.0    -      -       -      -
     66C  ALA*     5.0     6.7    -      -       +      +
     69C  SER*     4.3     4.5    -      -       -      +
     70C  SER*     3.9    17.5    -      -       -      -
     71C  PHE*     3.0    64.5    +      -       +      +
     73C  VAL*     1.3    77.5    -      -       -      +
     75C  ASN*     1.3    60.7    +      -       -      +
     77C  GLY*     3.0     4.0    +      -       -      -
     78C  THR*     2.8    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 75 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  CYS*     4.6     2.4    -      -       -      +
     18C  ALA*     3.7    14.3    -      -       -      +
     19C  ALA*     4.0    10.2    +      -       -      +
     22C  VAL*     4.1     5.7    -      -       -      +
     24C  TYR*     3.3    31.2    -      -       +      -
     70C  SER*     3.7    25.8    +      -       -      -
     71C  PHE      3.0    16.8    +      -       -      -
     72C  PRO      3.5     6.1    -      -       -      +
     74C  MET*     1.3    74.5    -      -       -      +
     76C  TYR*     1.3    60.5    +      -       -      +
     78C  THR*     3.3     6.5    +      -       -      +
     79C  TYR*     2.9    30.1    +      -       -      +
    306C  GLN*     3.0    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 76 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24C  TYR*     3.6    24.0    -      +       -      -
     72C  PRO*     2.9    26.6    +      -       +      -
     73C  VAL      3.5     9.0    -      -       -      +
     75C  ASN*     1.3    74.1    -      -       -      +
     77C  GLY*     1.3    66.3    +      -       -      +
     79C  TYR*     3.3     3.5    +      -       -      +
     80C  LEU*     3.0    33.3    +      -       +      +
    290C  PHE*     3.6    35.8    -      +       -      -
    299C  ARG      4.7     1.1    +      -       -      -
    302C  LEU*     3.6    42.2    +      -       +      +
    303C  ARG*     3.8    13.0    +      -       -      +
    306C  GLN      5.4     3.2    +      -       -      -
    308C  LEU*     4.0    32.5    -      -       +      +
    314C  LEU*     3.5    27.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 77 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73C  VAL      3.0    12.4    +      -       -      -
     74C  MET*     3.0     6.1    +      -       -      -
     76C  TYR*     1.3    74.9    -      -       -      +
     78C  THR*     1.3    56.8    -      -       -      +
     80C  LEU*     3.8     1.6    -      -       -      +
     81C  ARG*     3.0    32.8    +      -       -      +
    231C  TYR*     4.3     5.8    +      -       -      -
    318C  GLN*     3.3    32.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 78 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  CYS*     3.2    48.8    +      -       +      +
     16C  LYS*     3.9    15.0    -      -       +      +
     19C  ALA*     3.9    13.0    -      -       +      -
     25C  LEU*     4.5     0.4    -      -       +      -
     74C  MET      2.8    15.6    +      -       -      -
     75C  ASN*     3.7     6.5    +      -       -      -
     76C  TYR      3.2     0.2    -      -       -      -
     77C  GLY*     1.3    75.8    -      -       -      +
     79C  TYR*     1.3    62.8    +      -       -      +
     81C  ARG*     3.5    11.4    -      -       -      +
     82C  THR*     2.8    39.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 79 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19C  ALA*     4.9     0.4    -      -       -      +
     24C  TYR*     3.4    39.3    -      -       +      -
     25C  LEU*     3.9    17.2    -      -       +      +
     27C  SER*     3.9     1.3    -      -       -      -
     30C  LEU*     3.3    15.8    -      -       -      +
     75C  ASN      2.9    18.3    +      -       -      +
     76C  TYR*     3.7     4.3    -      +       -      +
     78C  THR*     1.3    77.2    -      -       -      +
     80C  LEU*     1.3    70.1    +      -       +      +
     82C  THR*     3.3     0.9    +      -       -      -
     83C  VAL*     2.8    61.3    +      -       +      +
    290C  PHE*     5.6     0.7    -      +       -      -
    294C  ILE*     3.7    15.5    -      -       +      +
    298C  GLU*     2.6    38.6    +      -       -      +
    301C  ARG*     3.7     3.8    -      -       -      -
    302C  LEU*     3.7    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 80 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  TYR*     3.0    25.4    +      -       +      +
     77C  GLY      3.8     2.9    -      -       -      +
     79C  TYR*     1.3    82.9    -      -       +      +
     81C  ARG*     1.3    59.5    +      -       -      +
     83C  VAL*     3.9     2.7    -      -       -      +
     84C  GLY*     2.8    28.9    +      -       -      -
    286C  MET*     3.2    40.0    -      -       +      +
    287C  TRP*     6.3     0.2    -      -       +      -
    289C  ILE*     4.3     4.3    -      -       +      +
    290C  PHE*     3.8    45.8    -      -       +      +
    294C  ILE*     3.8    19.3    -      -       +      -
    314C  LEU*     5.0     2.2    -      -       +      -
    318C  GLN*     3.7    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 81 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11C  ASP*     5.6     3.2    +      -       -      -
     12C  ALA*     3.7    30.7    -      -       -      +
     15C  CYS*     5.9     7.0    -      -       -      +
     77C  GLY      3.0    18.3    +      -       -      +
     78C  THR*     3.5    13.0    -      -       -      +
     80C  LEU*     1.3    75.9    -      -       -      +
     82C  THR*     1.3    59.0    +      -       -      +
     84C  GLY*     4.0     0.2    -      -       -      -
     85C  ILE*     3.1    35.2    +      -       -      +
    201C  GLU*     2.5    43.6    +      -       -      +
    202C  CYS*     3.7    30.3    -      -       -      +
    231C  TYR*     3.4    44.8    +      -       +      -
    286C  MET*     3.8     3.1    -      -       -      +
    321C  TYR*     5.9     1.6    -      -       -      -
    323C  LEU*     5.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 82 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16C  LYS*     3.1    35.6    +      -       -      +
     25C  LEU*     3.8    11.6    -      -       +      +
     31C  GLN*     3.4    23.8    -      -       -      +
     41C  TYR*     3.9     4.5    -      -       -      +
     78C  THR*     2.8    22.1    +      -       -      +
     79C  TYR      3.8     2.7    -      -       -      -
     81C  ARG*     1.3    76.1    -      -       -      +
     83C  VAL*     1.3    63.0    +      -       -      +
     85C  ILE      3.5     0.3    +      -       -      -
     86C  ASP*     2.9    34.1    +      -       -      +
    111C  ARG*     3.8    11.6    +      -       -      +
    201C  GLU*     5.1     0.9    +      -       -      -
   2004C  PO4      3.9     6.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 83 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25C  LEU*     3.8    14.6    -      -       +      -
     27C  SER*     3.7    30.5    -      -       -      +
     30C  LEU*     3.9    15.6    -      -       +      +
     31C  GLN*     4.4     5.8    -      -       +      -
     79C  TYR*     2.8    39.3    +      -       +      +
     80C  LEU*     3.9     4.9    -      -       -      +
     82C  THR*     1.3    69.9    -      -       -      +
     84C  GLY*     1.3    60.3    +      -       -      +
     86C  ASP*     4.1     5.3    -      -       -      +
     87C  ALA*     2.8    37.6    +      -       -      +
    289C  ILE*     5.6     0.4    -      -       +      -
    294C  ILE*     3.6    30.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 84 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80C  LEU      2.8    19.2    +      -       -      -
     81C  ARG      4.0     0.7    -      -       -      -
     83C  VAL*     1.3    79.0    -      -       -      +
     85C  ILE*     1.3    60.2    +      -       -      +
     87C  ALA*     3.9     3.4    -      -       -      +
     88C  ALA*     3.2    19.2    +      -       -      +
    286C  MET*     4.9     2.9    -      -       -      -
    289C  ILE*     5.0     8.5    -      -       -      -
    293C  GLN*     6.2     0.4    -      -       -      -
    323C  LEU*     3.4    28.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 85 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  ARG*     3.1    21.4    +      -       +      +
     84C  GLY*     1.3    73.8    -      -       -      +
     86C  ASP*     1.3    64.1    +      -       -      +
     88C  ALA*     3.3     4.5    +      -       -      +
     89C  ILE*     3.1    32.0    +      -       +      +
    111C  ARG*     3.6    28.7    -      -       -      +
    199C  ILE*     4.5    11.0    -      -       +      -
    201C  GLU*     3.5    45.1    -      -       +      +
    229C  ILE*     3.9    19.2    -      -       +      +
    231C  TYR*     4.1    10.5    -      -       +      -
    323C  LEU*     3.7    18.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 86 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31C  GLN*     2.7    47.7    -      -       +      +
     41C  TYR*     5.2     0.2    -      -       -      -
     82C  THR*     2.9    24.9    +      -       -      +
     83C  VAL      4.1     1.3    -      -       -      +
     85C  ILE*     1.3    76.0    -      -       -      +
     87C  ALA*     1.3    58.8    +      -       -      +
     89C  ILE*     3.2     9.9    +      -       -      +
     90C  LEU*     2.9    37.7    +      -       +      +
    111C  ARG*     2.7    37.0    +      -       -      +
    115C  LEU*     6.0     1.1    -      -       -      +
   2004C  PO4      4.8     4.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 87 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30C  LEU*     4.2    21.9    +      -       +      +
     83C  VAL      2.8    24.1    +      -       -      +
     84C  GLY*     3.9     4.3    -      -       -      +
     86C  ASP*     1.3    72.0    -      -       -      +
     88C  ALA*     1.3    57.8    +      -       -      +
     90C  LEU*     3.3     4.7    +      -       -      +
     91C  GLU*     3.1    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 88 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84C  GLY      3.2    13.5    +      -       -      +
     85C  ILE      3.5     9.0    -      -       -      +
     86C  ASP      3.2     0.2    -      -       -      -
     87C  ALA*     1.3    73.1    -      -       -      +
     89C  ILE*     1.3    63.5    +      -       -      +
     91C  GLU*     3.7     9.3    +      -       -      +
     92C  PHE      3.3    15.8    +      -       -      -
    227C  LEU*     3.5    12.6    -      -       +      +
    229C  ILE*     3.6    20.9    -      -       +      -
    323C  LEU*     4.9     0.7    -      -       +      -
    325C  LYS*     3.6    34.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 89 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85C  ILE*     3.1    20.2    +      -       +      +
     86C  ASP*     3.2    11.2    +      -       -      +
     88C  ALA*     1.3    73.6    -      -       -      +
     90C  LEU*     1.3    64.5    +      -       +      +
     92C  PHE*     3.3     4.3    +      -       -      +
     93C  LEU*     3.1    41.1    +      -       +      +
    101C  VAL*     5.4     1.6    -      -       +      -
    111C  ARG*     3.6    31.9    -      -       -      +
    115C  LEU*     4.0    26.5    -      -       +      -
    197C  ILE*     3.8    21.3    -      -       +      +
    199C  ILE*     3.7    17.3    -      -       +      -
    229C  ILE*     3.5    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 90 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29C  GLY      5.4     0.2    -      -       -      +
     30C  LEU      3.3    26.2    -      -       -      +
     31C  GLN*     3.5    22.9    -      -       -      +
     32C  ARG*     3.9    19.4    +      -       +      +
     86C  ASP*     2.9    25.5    +      -       +      +
     87C  ALA*     3.3     4.5    +      -       -      +
     89C  ILE*     1.3    73.5    -      -       +      +
     91C  GLU*     1.3    61.8    +      -       -      +
     93C  LEU*     3.3     6.0    +      -       -      +
     94C  VAL*     3.2    25.9    +      -       -      +
    115C  LEU*     4.5     7.9    -      -       +      -
    118C  MET*     4.2    13.9    -      -       +      -
    119C  PHE*     3.8    33.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 91 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  ALA      3.1    17.0    +      -       -      +
     88C  ALA*     3.7     9.4    -      -       -      +
     90C  LEU*     1.3    74.8    -      -       -      +
     92C  PHE*     1.3    64.4    +      -       -      +
     94C  VAL*     3.2    24.3    +      -       +      +
     95C  ALA*     3.6     6.2    +      -       -      +
    325C  LYS*     4.2    19.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 92 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88C  ALA      3.3     1.6    +      -       -      -
     89C  ILE      3.3     8.4    +      -       -      +
     91C  GLU*     1.3    80.1    -      -       -      +
     93C  LEU*     1.3    56.0    -      -       -      +
     95C  ALA*     3.4     2.7    +      -       -      -
     96C  ASN*     2.8    69.3    +      -       +      +
     99C  VAL*     3.8    21.3    -      -       +      -
    195C  PRO*     3.9    15.5    -      -       +      -
    196C  THR      4.5     0.4    -      -       -      -
    197C  ILE*     3.5    21.3    -      -       +      -
    225C  HIS*     5.2     1.3    -      -       +      -
    226C  GLY*     3.9    24.7    -      -       -      -
    227C  LEU*     3.6    43.3    -      -       +      -
    327C  GLN*     4.1    21.5    -      -       +      +
    328C  TRP      5.7     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 93 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89C  ILE*     3.1    37.8    +      -       +      +
     90C  LEU*     3.6     9.2    -      -       -      +
     91C  GLU      3.1     0.4    -      -       -      -
     92C  PHE*     1.3    75.6    -      -       -      +
     94C  VAL*     1.3    67.7    +      -       -      +
     96C  ASN      3.3    30.3    +      -       -      +
     97C  GLU*     3.8     9.0    +      -       -      +
     99C  VAL*     3.5    20.9    -      -       +      -
    115C  LEU*     4.2     1.3    -      -       +      -
    119C  PHE*     3.5    55.9    -      -       +      -
    122C  LEU*     3.7    22.7    -      -       +      -
    197C  ILE*     4.4     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 94 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32C  ARG*     4.5    16.8    -      -       -      +
     90C  LEU      3.2    15.8    +      -       -      +
     91C  GLU*     3.5    11.7    -      -       +      +
     93C  LEU*     1.3    79.0    -      -       -      +
     95C  ALA*     1.3    62.4    +      -       +      +
     97C  GLU*     5.0     5.9    +      -       -      +
    119C  PHE*     5.3     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 95 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  GLU      3.6     5.1    +      -       -      +
     92C  PHE*     3.4     4.7    +      -       -      +
     93C  LEU      3.3     0.2    -      -       -      -
     94C  VAL*     1.3    79.9    -      -       +      +
     96C  ASN*     1.3    75.0    +      -       -      +
     97C  GLU      4.1     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 96 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92C  PHE*     2.8    54.3    +      -       +      +
     93C  LEU*     3.3    16.3    +      -       -      +
     95C  ALA*     1.3    92.4    -      -       -      +
     97C  GLU*     1.3    59.2    +      -       -      +
     98C  LYS      3.5     2.2    -      -       -      +
     99C  VAL*     2.8    34.5    -      -       +      +
    195C  PRO*     3.6    23.9    -      -       +      +
    327C  GLN*     5.6     0.4    +      -       -      -
----------------------------------------------------------
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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