Contacts of the helix formed by residues 71 - 96 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69B  SER      3.7    11.2    -      -       -      -
     70B  SER*     1.3    81.2    -      -       -      +
     72B  PRO*     1.3    79.8    -      -       +      +
     73B  VAL*     3.8    20.0    -      -       +      -
     74B  MET*     3.1    44.0    +      -       +      +
     75B  ASN*     2.9    26.6    +      -       -      +
    306B  GLN*     4.8     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 72 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  TYR*     4.3     6.3    -      -       -      +
     71B  PHE*     1.3    90.2    -      -       +      -
     73B  VAL*     1.3    57.1    +      -       +      +
     75B  ASN*     3.8     0.4    -      -       +      +
     76B  TYR*     2.8    37.1    +      -       -      -
    306B  GLN*     3.3    34.1    -      -       +      +
    307B  PHE      3.8    23.8    -      -       -      +
    308B  LEU*     4.1    16.6    -      -       +      -
    309B  ASP      5.4     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 73 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  PHE*     3.2    19.1    +      -       +      -
     72B  PRO*     1.3    76.5    -      -       +      +
     74B  MET*     1.3    58.5    +      -       -      +
     77B  GLY*     3.0    23.7    +      -       -      -
    308B  LEU*     3.6    24.0    -      -       +      -
    310B  GLU*     3.7    17.9    -      -       +      +
    313B  GLU*     4.0    18.2    -      -       +      +
    314B  LEU*     3.4    33.6    -      -       +      +
    317B  MET*     3.9    22.7    -      -       +      -
    318B  GLN*     4.9     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 74 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  SER*     4.6     2.0    -      -       -      +
     15B  CYS*     3.5    45.5    -      -       -      +
     18B  ALA*     4.3     5.6    -      -       +      -
     66B  ALA*     4.4    11.4    -      -       +      +
     69B  SER      4.7     1.6    -      -       -      +
     70B  SER*     3.7    35.9    -      -       -      -
     71B  PHE*     3.1    37.2    +      -       +      +
     73B  VAL*     1.3    77.3    -      -       -      +
     75B  ASN*     1.3    66.2    +      -       -      +
     77B  GLY*     3.1     3.4    +      -       -      -
     78B  THR*     3.0    25.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 75 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  CYS      4.6     1.2    -      -       -      +
     18B  ALA*     3.5    26.1    +      -       -      +
     19B  ALA*     3.7     8.9    +      -       -      +
     22B  VAL*     3.8    17.7    -      -       +      +
     24B  TYR*     3.5    22.0    -      -       +      -
     70B  SER*     3.5    21.1    +      -       -      -
     71B  PHE      2.9    15.0    +      -       -      +
     72B  PRO      3.8     1.6    -      -       -      +
     74B  MET*     1.3    77.2    -      -       -      +
     76B  TYR*     1.3    65.3    +      -       -      +
     78B  THR*     3.4     6.5    +      -       -      -
     79B  TYR*     2.9    24.1    +      -       -      +
    306B  GLN*     3.0    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 76 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  TYR*     2.9    31.4    -      +       -      -
     72B  PRO      2.8    30.0    +      -       -      +
     75B  ASN*     1.3    73.3    -      -       -      +
     77B  GLY*     1.3    59.4    +      -       -      +
     79B  TYR*     3.2     6.0    +      +       -      +
     80B  LEU*     2.9    34.7    +      -       +      +
    290B  PHE*     4.0    26.5    -      +       -      -
    299B  ARG*     4.6     5.1    +      -       +      -
    302B  LEU*     3.4    44.3    -      -       +      +
    303B  ARG*     4.0     7.8    +      -       -      +
    306B  GLN      4.2     1.5    +      -       -      -
    308B  LEU*     3.7    34.1    +      -       +      +
    314B  LEU*     3.6    31.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 77 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  VAL      3.0    13.4    +      -       -      -
     74B  MET*     3.1     5.0    +      -       -      -
     76B  TYR*     1.3    77.6    -      -       -      +
     78B  THR*     1.3    55.5    +      -       -      +
     80B  LEU*     3.7     2.2    -      -       -      +
     81B  ARG*     2.9    31.1    +      -       -      +
    231B  TYR*     4.3     5.0    +      -       -      -
    314B  LEU*     4.1     0.6    -      -       -      +
    318B  GLN*     3.3    33.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 78 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  ALA      5.5     0.2    -      -       -      +
     15B  CYS*     3.3    52.9    +      -       +      +
     16B  LYS*     3.8    12.8    -      -       -      +
     19B  ALA*     3.7    12.6    -      -       +      -
     25B  LEU*     4.4     0.4    -      -       +      -
     74B  MET*     3.0    14.0    +      -       -      +
     75B  ASN*     3.7     8.2    -      -       -      -
     76B  TYR      3.3     0.2    -      -       -      -
     77B  GLY*     1.3    71.7    -      -       -      +
     79B  TYR*     1.3    65.6    +      -       -      +
     81B  ARG*     3.4    12.7    +      -       -      +
     82B  THR*     2.8    38.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 79 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  ALA*     4.6     0.6    -      -       -      +
     24B  TYR*     3.4    42.0    -      -       +      -
     25B  LEU*     3.9    17.0    -      -       +      -
     27B  SER*     4.0     1.1    -      -       -      -
     30B  LEU*     3.4     9.4    -      -       -      +
     75B  ASN      2.9    17.7    +      -       -      +
     76B  TYR*     3.4     8.5    -      +       -      +
     78B  THR*     1.3    76.7    -      -       -      +
     80B  LEU*     1.3    66.1    +      -       +      +
     82B  THR*     3.7     0.5    -      -       -      -
     83B  VAL*     2.9    51.7    +      -       +      +
    290B  PHE*     5.9     0.7    -      +       -      -
    294B  ILE*     3.6    26.8    -      -       +      +
    298B  GLU*     2.6    45.2    +      -       -      +
    301B  ARG*     3.8     3.4    -      -       -      -
    302B  LEU*     3.7    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 80 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76B  TYR*     2.9    24.0    +      -       +      +
     77B  GLY      3.7     3.8    -      -       -      +
     79B  TYR*     1.3    83.7    -      -       +      +
     81B  ARG*     1.3    55.9    +      -       -      +
     83B  VAL*     3.8     2.7    -      -       -      +
     84B  GLY*     2.8    29.1    +      -       -      -
    286B  MET*     3.2    36.3    -      -       +      +
    289B  ILE*     4.7     3.7    -      -       +      +
    290B  PHE*     3.8    31.9    -      -       +      +
    294B  ILE*     3.6    33.0    -      -       +      -
    314B  LEU*     4.7     7.6    -      -       +      -
    318B  GLN*     3.9    26.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 81 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  ALA*     3.8    29.5    -      -       -      +
     15B  CYS*     5.8     6.5    -      -       -      +
     77B  GLY      2.9    18.7    +      -       -      +
     78B  THR*     3.4    12.6    -      -       -      +
     80B  LEU*     1.3    74.3    -      -       -      +
     82B  THR*     1.3    64.7    +      -       -      +
     85B  ILE*     3.1    32.3    +      -       +      +
    201B  GLU*     2.7    38.7    +      -       -      +
    202B  CYS*     3.7    34.2    -      -       -      +
    231B  TYR*     3.4    44.3    +      -       +      -
    286B  MET*     3.7     3.1    -      -       -      +
    321B  TYR*     5.7     2.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 82 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  LYS*     3.3    23.9    +      -       -      +
     25B  LEU*     3.6    13.6    -      -       +      +
     31B  GLN*     3.3    28.9    -      -       -      +
     41B  TYR*     3.8    12.6    -      -       -      +
     78B  THR*     2.8    18.9    +      -       -      +
     79B  TYR      3.7     2.7    -      -       -      -
     81B  ARG*     1.3    81.0    -      -       -      +
     83B  VAL*     1.3    58.3    +      -       -      +
     86B  ASP*     2.9    37.7    +      -       -      +
    111B  ARG*     3.5    11.5    +      -       -      +
    201B  GLU*     5.3     1.4    +      -       -      -
   2003B  PO4      3.9     7.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 83 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25B  LEU*     3.9    15.5    -      -       +      -
     27B  SER*     3.9    13.2    -      -       -      -
     30B  LEU*     3.9    18.9    -      -       +      +
     31B  GLN*     4.2     6.5    -      -       +      -
     79B  TYR*     2.9    46.3    +      -       +      +
     80B  LEU*     3.8     4.7    -      -       -      +
     82B  THR*     1.3    74.6    -      -       -      +
     84B  GLY*     1.3    63.5    +      -       -      +
     86B  ASP*     4.3     5.8    -      -       -      -
     87B  ALA*     2.9    31.7    +      -       -      +
    289B  ILE*     5.7     0.4    -      -       +      -
    293B  GLN*     5.0     0.4    -      -       -      +
    294B  ILE*     3.6    31.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 84 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80B  LEU      2.8    19.9    +      -       -      -
     81B  ARG      4.1     0.2    -      -       -      -
     83B  VAL*     1.3    78.9    -      -       -      +
     85B  ILE*     1.3    62.2    +      -       -      +
     87B  ALA*     4.0     1.6    -      -       -      +
     88B  ALA*     3.2    18.7    +      -       -      +
    286B  MET*     4.8     0.4    -      -       -      -
    289B  ILE*     4.5     5.8    -      -       -      -
    293B  GLN*     4.3    14.6    -      -       -      +
    323B  LEU*     3.4    28.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 85 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  ARG*     3.1    22.1    +      -       +      +
     84B  GLY*     1.3    75.0    -      -       -      +
     86B  ASP*     1.3    57.6    +      -       -      +
     88B  ALA*     3.1     5.2    +      -       -      +
     89B  ILE*     2.9    41.5    +      -       +      +
    111B  ARG*     3.5    27.8    -      -       -      +
    199B  ILE*     4.7     8.7    -      -       +      -
    201B  GLU*     3.3    43.3    -      -       +      +
    229B  ILE*     4.0    13.4    -      -       +      +
    231B  TYR*     3.9    13.7    -      -       +      -
    323B  LEU*     3.8    23.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 86 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  LEU      4.8     0.4    -      -       -      +
     31B  GLN*     2.7    44.7    +      -       +      +
     82B  THR*     2.9    22.0    +      -       -      +
     83B  VAL      4.0     2.7    -      -       -      +
     85B  ILE*     1.3    77.7    -      -       -      +
     87B  ALA*     1.3    52.1    +      -       -      +
     89B  ILE*     3.3     7.8    +      -       -      +
     90B  LEU*     2.8    50.3    +      -       +      +
    111B  ARG*     2.6    38.1    +      -       -      +
    115B  LEU*     5.6     3.1    -      -       -      +
   2003B  PO4      4.9     3.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 87 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  LEU*     4.4    19.4    +      -       +      +
     32B  ARG*     4.7     3.5    +      -       -      +
     83B  VAL      2.9    19.8    +      -       -      +
     84B  GLY      4.0     2.7    -      -       -      +
     86B  ASP*     1.3    75.8    -      -       -      +
     88B  ALA*     1.3    62.8    +      -       -      +
     90B  LEU*     4.0     3.9    -      -       -      +
     91B  GLU*     3.1    36.1    +      -       +      +
    293B  GLN*     4.3    15.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 88 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84B  GLY      3.2    11.5    +      -       -      +
     85B  ILE      3.1    10.4    +      -       -      +
     87B  ALA*     1.3    78.6    -      -       -      +
     89B  ILE*     1.3    67.2    +      -       -      +
     91B  GLU*     3.6     6.5    +      -       -      +
     92B  PHE*     3.5    12.6    +      -       -      +
    227B  LEU*     3.7    12.6    -      -       +      +
    229B  ILE*     3.6    21.8    -      -       +      -
    323B  LEU*     5.1     0.9    -      -       +      -
    325B  LYS*     3.8    31.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 89 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85B  ILE*     2.9    22.6    +      -       +      +
     86B  ASP*     3.5    10.8    -      -       -      +
     88B  ALA*     1.3    75.7    -      -       -      +
     90B  LEU*     1.3    65.3    +      -       +      +
     92B  PHE*     3.1     5.4    +      -       -      +
     93B  LEU*     2.9    47.8    +      -       +      +
    101B  VAL*     5.2     2.2    -      -       +      -
    111B  ARG*     3.5    33.4    -      -       -      +
    115B  LEU*     4.0    18.6    -      -       +      -
    197B  ILE*     3.9    14.8    -      -       +      +
    199B  ILE*     3.6    20.2    -      -       +      -
    229B  ILE*     3.4    21.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 90 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  LEU      3.6    20.0    -      -       -      +
     31B  GLN*     3.4    24.9    -      -       -      +
     32B  ARG*     3.8    26.0    -      -       +      +
     86B  ASP*     2.8    31.5    +      -       +      +
     87B  ALA*     3.4     3.3    +      -       -      +
     89B  ILE*     1.3    73.1    -      -       -      +
     91B  GLU*     1.3    59.1    +      -       -      +
     93B  LEU*     3.9     2.4    -      -       -      +
     94B  VAL*     2.9    36.5    +      -       -      +
    115B  LEU*     3.8    19.5    -      -       +      -
    118B  MET*     3.8    12.3    -      -       +      -
    119B  PHE*     3.6    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 91 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32B  ARG*     3.8    18.6    -      -       -      +
     87B  ALA*     3.1    25.8    +      -       -      +
     88B  ALA*     3.9     6.0    -      -       -      +
     89B  ILE      3.2     0.2    -      -       -      -
     90B  LEU*     1.3    76.8    -      -       -      +
     92B  PHE*     1.3    61.7    +      -       -      +
     94B  VAL*     3.6     4.8    +      -       -      +
     95B  ALA*     3.2    22.2    +      -       -      +
    325B  LYS*     5.6     5.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 92 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  ALA      3.5     1.4    +      -       -      -
     89B  ILE      3.1     8.1    +      -       -      +
     91B  GLU*     1.3    78.4    -      -       -      +
     93B  LEU*     1.3    59.5    -      -       -      +
     95B  ALA*     3.2     2.3    +      -       -      -
     96B  ASN*     2.8    63.5    +      -       -      +
     99B  VAL*     3.8    23.1    -      -       +      -
    195B  PRO*     3.9    18.2    -      -       +      -
    196B  THR      4.4     0.4    -      -       -      -
    197B  ILE*     3.4    25.6    -      -       +      -
    225B  HIS*     5.2     0.9    -      -       +      -
    226B  GLY*     4.1    21.3    -      -       -      -
    227B  LEU*     3.8    36.6    -      -       +      -
    327B  GLN*     4.0    22.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 93 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89B  ILE*     2.9    38.1    +      -       +      +
     90B  LEU*     3.9     1.3    -      -       +      +
     92B  PHE*     1.3    75.1    -      -       -      +
     94B  VAL*     1.3    61.3    +      -       -      +
     96B  ASN      3.0    21.7    +      -       -      +
     97B  GLU*     4.0     3.3    +      -       -      -
     99B  VAL*     3.1    37.9    -      -       +      +
    101B  VAL*     4.3     0.4    -      -       +      -
    115B  LEU*     3.9     8.7    -      -       +      -
    119B  PHE*     3.5    54.5    -      -       +      -
    122B  LEU*     3.9    17.3    -      -       +      -
    197B  ILE*     3.5    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 94 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  GLY*     5.3     5.4    -      -       -      +
     32A  ARG*     3.7    43.7    -      -       +      +
     32B  ARG*     3.4    23.1    -      -       -      +
     90B  LEU*     2.9    21.2    +      -       +      +
     91B  GLU*     3.9     4.5    -      -       -      +
     93B  LEU*     1.3    78.6    -      -       -      +
     95B  ALA*     1.3    60.7    +      -       -      +
     96B  ASN      3.5     1.0    +      -       -      -
     97B  GLU*     5.0     1.9    +      -       -      +
    119B  PHE*     4.1    19.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 95 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  GLU      3.2    15.4    +      -       -      +
     92B  PHE*     3.2     3.3    +      -       -      -
     94B  VAL*     1.3    77.0    -      -       -      +
     96B  ASN*     1.3    74.9    +      -       -      +
     97B  GLU      4.0     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 96 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92B  PHE*     2.8    65.0    +      -       +      +
     93B  LEU      3.0    12.2    -      -       -      +
     94B  VAL      3.3     1.2    -      -       -      -
     95B  ALA*     1.3    90.7    -      -       -      +
     97B  GLU*     1.3    66.6    +      -       -      +
     98B  LYS      3.4     4.8    +      -       -      +
     99B  VAL*     3.6    13.0    -      -       +      +
    195B  PRO*     4.0    22.5    -      -       +      +
----------------------------------------------------------
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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