Contacts of the helix formed by residues 37 - 61 (chain C) in PDB entry 1BRR


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 PRO 37 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  ASP*     4.2    23.5    -      -       +      +
    106A  GLY      5.0     1.9    +      -       -      -
     35C  SER      3.2     7.9    -      -       -      +
     36C  ASP*     1.3    89.7    -      -       -      +
     38C  ASP*     1.3    63.6    +      -       +      +
     40C  LYS*     3.1    25.4    -      -       +      +
     41C  LYS*     3.4    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 38 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36C  ASP*     3.2    16.0    +      -       -      +
     37C  PRO*     1.3    84.8    -      -       +      +
     39C  ALA*     1.3    59.9    +      -       -      +
     40C  LYS      3.5     0.3    +      -       -      -
     41C  LYS*     3.7    25.8    +      -       -      +
     42C  PHE*     3.1    31.2    -      -       -      -
     99C  LEU      5.5     1.6    -      -       -      +
    229C  ILE      3.8     7.8    -      -       -      +
    230C  PHE*     4.4    11.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 39 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34C  VAL*     4.4    11.0    -      -       +      -
     36C  ASP*     2.7    23.6    +      -       +      +
     38C  ASP*     1.3    71.4    -      -       -      +
     40C  LYS*     1.3    65.9    +      -       -      +
     42C  PHE*     3.2    12.0    +      -       -      +
     43C  TYR*     3.1    32.5    +      -       +      -
    229C  ILE*     3.4    20.6    +      -       +      +
    231C  GLY*     3.5    17.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 40 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  ASP*     2.8    35.9    +      -       +      +
    106A  GLY*     4.2     7.4    -      -       -      -
    107A  THR*     3.3    28.5    -      -       +      +
   1000A  ARC      4.0    33.0    -      -       +      +
     34C  VAL*     4.4    20.2    -      -       +      +
     35C  SER*     4.5     8.4    +      -       -      +
     36C  ASP      2.9    11.9    +      -       -      +
     37C  PRO*     3.1    20.0    -      -       +      +
     39C  ALA*     1.3    76.7    -      -       -      +
     41C  LYS*     1.3    63.7    +      -       -      +
     43C  TYR*     3.1     6.2    +      -       -      +
     44C  ALA*     2.9    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 41 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  GLN*     3.8    37.0    +      -       +      +
    106A  GLY*     4.0    20.8    -      -       -      +
    109A  LEU*     5.8     2.0    -      -       +      -
     37C  PRO      3.5    15.0    -      -       -      +
     38C  ASP*     3.7    22.0    +      -       -      +
     40C  LYS*     1.3    76.7    -      -       -      +
     42C  PHE*     1.3    60.0    +      -       +      +
     44C  ALA*     3.1     3.9    +      -       -      +
     45C  ILE*     2.8    37.3    +      -       +      +
     99C  LEU*     3.9    40.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 42 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38C  ASP*     3.1    34.1    -      -       -      -
     39C  ALA*     3.2     6.9    +      -       -      +
     41C  LYS*     1.3    81.9    -      -       +      +
     43C  TYR*     1.3    56.7    +      -       +      +
     46C  THR*     2.5    35.9    +      -       -      +
     96C  ASP*     3.5    44.6    -      -       -      +
     99C  LEU*     3.7    36.6    -      -       +      -
    100C  LEU*     3.8    17.0    -      -       +      -
    223C  LEU*     4.4    12.8    -      -       +      -
    224C  LEU*     3.9    10.3    -      -       +      +
    229C  ILE*     3.4    38.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 43 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1000A  ARC      3.5    18.2    -      -       +      -
     27C  PHE      4.1    11.2    -      -       -      -
     30C  LYS*     3.4    30.4    +      -       +      -
     31C  GLY*     3.6    32.5    -      -       -      -
     34C  VAL*     4.1    25.9    -      -       +      +
     39C  ALA*     3.1    26.6    +      -       +      +
     40C  LYS*     3.6     6.3    -      -       -      +
     42C  PHE*     1.3    76.6    -      -       +      +
     44C  ALA*     1.3    58.8    +      -       -      +
     45C  ILE      3.2     0.2    +      -       -      -
     46C  THR*     3.3     0.9    +      -       -      -
     47C  THR*     2.6    39.1    +      -       -      -
    224C  LEU*     3.5    45.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 44 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  GLY*     3.2    29.4    -      -       -      +
    109A  LEU*     4.7     5.4    -      -       +      -
    110A  ALA*     3.7    16.4    -      -       +      +
   1000A  ARC      3.6    18.1    -      -       +      +
     40C  LYS      2.9    11.3    +      -       -      +
     41C  LYS*     3.5     8.1    -      -       -      +
     43C  TYR*     1.3    78.7    -      -       -      +
     45C  ILE*     1.3    60.2    +      -       -      +
     47C  THR*     4.3     1.0    -      -       -      -
     48C  LEU*     3.5    30.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 45 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  LEU*     3.3    22.7    -      -       +      -
     41C  LYS*     2.8    23.1    +      -       +      +
     44C  ALA*     1.3    71.2    -      -       -      +
     46C  THR*     1.3    63.5    +      -       -      +
     47C  THR      3.1     2.5    +      -       -      -
     48C  LEU*     3.3    13.0    +      -       -      +
     49C  VAL*     3.4    17.9    +      -       +      +
     92C  LEU*     3.2    43.7    -      -       +      +
     95C  LEU*     3.8    24.5    -      -       +      -
     96C  ASP*     3.4    23.8    -      -       -      +
     99C  LEU*     3.8    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 46 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27C  PHE*     3.5     9.4    -      -       +      -
     42C  PHE      2.5    23.7    +      -       -      -
     43C  TYR      4.1     1.6    -      -       -      -
     45C  ILE*     1.3    75.2    -      -       -      +
     47C  THR*     1.3    56.6    +      -       -      +
     49C  VAL*     4.4     6.6    -      -       +      +
     50C  PRO*     3.1    20.8    -      -       -      +
     93C  LEU*     6.2     1.3    -      -       +      -
     96C  ASP*     2.6    24.8    +      -       -      +
    216C  LYS      5.2     1.6    -      -       -      +
    219C  PHE*     5.1     2.5    -      -       +      -
    220C  GLY*     3.3    39.3    -      -       -      +
    223C  LEU*     3.6     8.3    -      -       +      +
    224C  LEU*     4.0    16.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 47 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1000A  ARC      3.4    41.8    -      -       +      +
     24C  THR*     4.0    18.1    -      -       +      +
     27C  PHE*     3.9    19.9    +      -       +      +
     28C  LEU*     4.0    21.1    -      -       +      +
     43C  TYR*     2.6    24.1    +      -       -      -
     44C  ALA      4.3     0.2    -      -       -      -
     46C  THR*     1.3    78.2    -      -       -      +
     48C  LEU*     1.3    61.4    +      -       -      +
     49C  VAL      3.2     0.7    -      -       -      -
     50C  PRO*     3.0    18.5    -      -       -      +
     51C  ALA*     3.2    10.7    +      -       -      +
    224C  LEU*     5.5     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 48 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  LEU*     3.7    21.1    -      -       +      +
    110A  ALA*     4.2     3.8    -      -       -      -
    113A  GLY*     3.7    36.8    -      -       -      -
    114A  ALA      3.8     0.2    -      -       -      +
    117A  ILE*     3.9    17.9    -      -       +      -
   1000A  ARC      3.6    30.3    -      -       +      -
   1002A  ARC      5.0     8.5    -      -       +      -
     44C  ALA      3.5    19.2    +      -       -      +
     45C  ILE*     3.3     5.9    +      -       -      +
     47C  THR*     1.3    78.1    -      -       -      +
     49C  VAL*     1.3    60.2    +      -       -      +
     51C  ALA*     4.0     3.1    -      -       +      -
     52C  ILE*     2.8    44.7    +      -       +      +
     92C  LEU*     4.6     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 49 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45C  ILE*     3.4    17.9    -      -       +      +
     46C  THR*     4.4     4.7    -      -       +      +
     48C  LEU*     1.3    77.5    -      -       -      +
     50C  PRO*     1.3    66.1    -      -       +      +
     52C  ILE*     3.6     2.4    +      -       -      -
     53C  ALA*     3.1    25.5    +      -       -      +
     89C  THR*     3.5    27.5    +      -       +      +
     92C  LEU*     3.9    21.3    -      -       +      -
     93C  LEU*     3.5    27.8    -      -       +      -
    216C  LYS*     3.5    33.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 50 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  MET*     3.8    19.9    -      -       -      +
     23C  GLY      4.8     1.3    -      -       -      -
     24C  THR*     3.0    22.2    +      -       -      +
     27C  PHE*     4.2    18.8    -      -       +      -
     46C  THR      3.1    19.1    -      -       -      +
     47C  THR      3.0    16.6    -      -       -      +
     49C  VAL*     1.3    89.2    -      -       +      +
     51C  ALA*     1.3    51.8    +      -       -      -
     53C  ALA*     3.2     8.1    +      -       +      +
     54C  PHE*     2.7    35.9    +      -       -      +
    216C  LYS*     4.8    11.2    -      -       +      -
    217C  VAL*     4.8     7.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 51 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ILE*     3.9    20.8    -      -       +      +
   1000A  ARC      4.8    13.2    -      -       +      -
     24C  THR*     3.2    22.8    +      -       +      -
     47C  THR      3.2    12.3    +      -       -      +
     48C  LEU*     3.2    12.9    +      -       +      +
     50C  PRO*     1.3    77.6    -      -       -      +
     52C  ILE*     1.3    61.7    +      -       -      +
     54C  PHE*     3.3    16.7    +      -       -      +
     55C  THR*     3.3    17.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 52 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ILE*     4.5     8.3    -      -       +      -
   1002A  ARC      4.0    43.5    -      -       +      -
     48C  LEU*     2.8    28.5    +      -       +      +
     49C  VAL      3.7     3.4    -      -       -      +
     51C  ALA*     1.3    70.6    -      -       -      +
     53C  ALA*     1.3    63.9    +      -       -      +
     55C  THR*     3.2     9.6    +      -       -      -
     56C  MET*     3.0    22.9    +      -       +      +
     85C  ASP*     3.6    30.5    -      -       -      +
     88C  PHE*     4.3    17.3    -      -       +      -
     89C  THR*     3.8     7.6    -      -       -      +
     92C  LEU*     4.0    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 53 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  MET*     3.6    25.6    -      -       +      -
     49C  VAL      3.1    15.6    +      -       -      +
     50C  PRO      3.5     4.9    -      -       -      +
     52C  ILE*     1.3    78.8    -      -       -      +
     54C  PHE*     1.3    59.2    +      -       -      +
     56C  MET      3.7     0.2    -      -       -      -
     57C  TYR*     2.8    37.2    +      -       +      +
     85C  ASP*     3.2    22.2    +      -       -      +
    216C  LYS*     3.9    12.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 54 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140A  ILE*     4.1    31.2    -      -       +      -
   1000A  ARC      6.3     4.0    -      -       +      -
     17C  THR*     3.6    36.6    -      -       +      -
     20C  MET*     4.2    12.5    -      -       +      +
     21C  GLY*     3.7    21.3    -      -       -      +
     24C  THR*     5.1     0.4    -      -       -      +
     50C  PRO      2.7    16.9    +      -       -      +
     51C  ALA*     3.4    12.3    -      -       -      +
     52C  ILE      3.2     0.4    -      -       -      -
     53C  ALA*     1.3    72.0    -      -       -      +
     55C  THR*     1.3    66.2    +      -       -      +
     57C  TYR*     3.2     3.7    +      -       -      +
     58C  LEU*     2.9    44.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 55 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ILE*     3.7    17.2    -      -       -      +
    121A  THR*     3.7    16.1    +      -       -      +
    124A  VAL*     5.5     1.6    -      -       +      -
    137A  TRP*     3.4    32.6    -      -       +      -
    140A  ILE*     4.9     3.8    -      -       -      +
   1002A  ARC      3.7    11.9    -      -       +      -
     51C  ALA      3.3    10.3    +      -       -      -
     52C  ILE*     3.2    10.0    +      -       -      -
     54C  PHE*     1.3    87.8    -      -       -      +
     56C  MET*     1.3    80.6    +      -       +      +
     58C  LEU*     4.6     0.7    -      -       -      -
     59C  SER*     3.2    20.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 56 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  VAL*     5.1     1.8    -      -       +      -
    137A  TRP*     5.9     0.2    -      -       +      -
   1002A  ARC      3.5    42.0    -      -       +      -
     52C  ILE*     3.0    14.3    +      -       +      +
     55C  THR*     1.3   104.1    -      -       +      +
     57C  TYR*     1.3    60.1    +      -       -      +
     59C  SER*     3.1    21.5    +      -       -      +
     60C  MET*     3.2    22.7    -      -       +      +
     80C  TRP*     5.0     2.5    -      -       -      -
     81C  ALA*     3.2    37.5    -      -       -      +
     84C  ALA*     3.7    15.9    -      -       +      -
     85C  ASP*     3.4    36.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 57 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13C  LEU*     3.7    34.4    -      -       +      +
     16C  GLY*     3.8    20.4    -      -       -      +
     17C  THR*     3.7    17.9    +      -       -      -
     20C  MET*     4.3    15.5    -      -       +      -
     53C  ALA*     2.8    28.8    +      -       +      +
     54C  PHE*     3.7     3.6    -      -       -      +
     56C  MET*     1.3    74.7    -      -       -      +
     58C  LEU*     1.3    66.1    +      -       -      +
     60C  MET*     3.2    29.2    +      -       +      +
     61C  LEU*     3.0    20.6    +      -       -      +
     82C  ARG*     3.9     5.8    +      -       -      -
     85C  ASP*     4.6     7.9    -      -       -      -
    205C  THR*     4.8     1.4    +      -       +      -
    208C  PHE      3.6     1.0    +      -       -      -
    209C  MET*     3.3    30.5    +      -       +      +
    212C  ASP*     2.9    37.2    +      -       +      -
    213C  VAL*     6.1     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 58 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  VAL*     4.2    12.1    -      -       +      -
    137A  TRP*     3.7    17.5    -      -       +      -
    140A  ILE*     3.4    33.0    -      -       +      -
     17C  THR*     3.8    20.1    +      -       +      -
     54C  PHE*     2.9    27.4    +      -       +      +
     55C  THR      3.7     3.6    -      -       -      +
     57C  TYR*     1.3    77.3    -      -       -      +
     59C  SER*     1.3    51.5    +      -       -      +
     61C  LEU*     2.9    21.7    +      -       +      +
     62C  LEU*     2.7    55.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 59 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  VAL*     5.3     1.8    -      -       -      -
    137A  TRP*     3.8    19.9    -      -       -      -
     55C  THR      3.2    11.2    +      -       -      -
     56C  MET*     3.1    21.1    +      -       -      -
     58C  LEU*     1.3    78.2    -      -       -      +
     60C  MET*     1.3    64.8    +      -       -      +
     62C  LEU*     3.2     2.2    +      -       -      +
     63C  GLY      3.1    17.5    +      -       -      -
     64C  TYR*     3.2    28.0    +      -       -      -
     65C  GLY*     3.2    10.2    +      -       -      -
     80C  TRP*     6.3     0.4    -      -       -      -
     81C  ALA*     3.5    17.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 60 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13C  LEU*     3.4    20.9    -      -       +      +
     56C  MET*     3.2    22.7    -      -       +      +
     57C  TYR*     3.2    37.8    +      -       +      +
     59C  SER*     1.3    80.9    +      -       -      +
     61C  LEU*     1.3    62.2    +      -       -      +
     63C  GLY*     3.5     8.3    +      -       -      -
     65C  GLY*     4.4     5.8    -      -       -      +
     66C  LEU*     5.1     0.4    -      -       -      +
     79C  TYR*     3.4    43.3    +      -       +      -
     81C  ALA*     3.7    14.4    -      -       +      -
     82C  ARG*     3.6    52.3    -      -       +      +
     85C  ASP*     6.0     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 61 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6C  GLY      5.6     1.4    -      -       -      +
     10C  TRP*     3.5    41.1    -      -       +      +
     13C  LEU*     4.1    10.6    -      -       +      +
     14C  ALA*     4.1    17.3    -      -       +      +
     17C  THR*     4.2    14.6    -      -       +      +
     57C  TYR      3.0    12.0    +      -       -      +
     58C  LEU*     2.9    27.9    +      -       +      +
     60C  MET*     1.3    79.2    -      -       -      +
     62C  LEU*     1.3    67.3    +      -       +      +
     63C  GLY      3.1     5.1    +      -       -      -
----------------------------------------------------------
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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