Contacts of the helix formed by residues 13 - 40 (chain H) in PDB entry 2RCR


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 ALA 13 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11H  ASP*     3.1     9.7    +      -       -      +
     12H  LEU*     1.3    78.7    -      -       -      +
     14H  SER*     1.3    67.0    +      -       -      +
     16H  ALA*     2.9    22.6    -      -       -      +
     17H  ILE*     3.5     4.7    +      -       -      +
    199M  PHE*     4.9     3.1    -      -       +      -
    284M  LEU*     4.7    12.1    -      -       +      -
    288M  VAL*     4.7    14.0    -      -       +      +
    289M  VAL*     5.0     4.0    -      -       +      -
    292M  TRP*     5.3     3.4    -      -       +      -
    295M  TRP*     3.2    37.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 14 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10H  PHE*     5.3    11.7    -      -       -      -
     11H  ASP*     3.2    18.4    +      -       -      +
     13H  ALA*     1.3    80.9    -      -       -      +
     15H  LEU*     1.3    66.0    +      -       -      +
     17H  ILE*     3.2    12.6    +      -       -      +
     18H  TYR*     3.5     8.3    +      -       -      +
    295M  TRP*     3.6    14.7    -      -       -      -
    299M  HIS*     3.8    26.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 15 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10H  PHE*     5.1     7.9    -      -       +      +
     11H  ASP      3.8    12.1    -      -       -      +
     12H  LEU*     3.1    39.7    -      -       +      +
     14H  SER*     1.3    72.9    -      -       -      +
     16H  ALA*     1.3    59.1    +      -       -      +
     17H  ILE      3.0     2.2    -      -       -      -
     18H  TYR*     2.8    12.3    +      -       +      +
     19H  SER*     2.5    46.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 16 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12H  LEU*     3.8     5.6    -      -       +      +
     13H  ALA*     2.9    26.0    -      -       -      +
     15H  LEU*     1.3    84.4    -      -       -      +
     17H  ILE*     1.3    55.4    +      -       -      +
     19H  SER*     3.3     9.7    -      -       -      -
     20H  PHE*     3.1    25.1    +      -       -      +
    199M  PHE*     4.4     9.2    -      -       +      -
    280M  ILE*     5.8     2.0    -      -       +      -
    284M  LEU*     4.4    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 17 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13H  ALA      4.4     4.5    -      -       -      +
     14H  SER      3.2     9.0    +      -       -      +
     15H  LEU      3.0     0.4    -      -       -      -
     16H  ALA*     1.3    79.0    -      -       -      +
     18H  TYR*     1.3    56.1    +      -       -      +
     19H  SER      3.2     0.2    -      -       -      -
     20H  PHE*     3.7    21.5    -      -       +      -
     21H  TRP*     2.6    71.9    +      -       +      +
    198M  PRO*     3.9    30.5    -      -       +      +
    199M  PHE*     3.4    39.5    -      -       +      -
    295M  TRP*     5.0     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 18 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14H  SER      3.5     4.0    +      -       -      +
     15H  LEU*     2.8    21.0    +      -       +      +
     17H  ILE*     1.3    72.8    -      -       -      +
     19H  SER*     1.3    68.9    +      -       -      +
     21H  TRP*     4.3     9.2    -      +       +      -
     22H  ILE*     3.2    53.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 19 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15H  LEU*     2.5    37.0    +      -       -      +
     16H  ALA*     3.3    12.0    +      -       -      -
     18H  TYR*     1.3    76.2    -      -       -      +
     20H  PHE*     1.3    62.5    +      -       -      +
     22H  ILE*     4.9     1.8    -      -       -      -
     23H  PHE*     3.0    45.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 20 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16H  ALA      3.1    13.6    +      -       -      +
     17H  ILE*     3.5    16.8    -      -       +      +
     18H  TYR      3.3     0.2    -      -       -      -
     19H  SER*     1.3    80.6    -      -       -      +
     21H  TRP*     1.3    78.4    +      +       -      +
     23H  PHE*     3.7     2.2    -      -       -      +
     24H  LEU*     2.8    48.8    +      -       +      +
    450L  BCL      6.5     0.7    -      -       +      -
    199M  PHE*     5.6     2.9    -      +       +      -
    202M  LEU*     3.0    45.5    -      -       +      -
    206M  PHE*     4.0    17.0    -      +       -      -
    273M  LEU*     5.3     9.6    -      -       +      -
    277M  THR*     4.1    21.5    -      -       +      -
    280M  ILE*     6.3     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 21 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17H  ILE*     2.6    59.3    +      -       +      +
     18H  TYR*     3.9    12.1    -      +       +      +
     20H  PHE*     1.3   102.5    -      +       -      +
     22H  ILE*     1.3    58.8    +      -       -      +
     24H  LEU*     2.8    25.8    -      -       -      +
     25H  ALA*     2.9     9.4    +      -       -      +
    450L  BCL      4.0    49.0    -      -       +      +
    198M  PRO*     5.8     2.3    +      -       +      +
    202M  LEU*     4.1     7.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 22 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18H  TYR*     3.2    42.1    +      -       +      +
     19H  SER*     4.6     0.7    -      -       -      -
     21H  TRP*     1.3    73.7    -      -       -      +
     23H  PHE*     1.3    90.5    +      -       +      +
     24H  LEU      2.8     4.7    -      -       -      -
     25H  ALA*     2.7    33.7    +      -       +      +
     26H  GLY*     2.7    14.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 23 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19H  SER*     3.0    30.9    +      -       -      +
     20H  PHE*     4.0     2.9    -      -       -      +
     22H  ILE*     1.3   106.8    -      -       +      +
     24H  LEU*     1.3    59.4    +      -       -      +
     26H  GLY*     3.2    16.5    +      -       -      +
     27H  LEU*     3.5     6.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 24 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20H  PHE*     2.8    32.5    +      -       +      +
     21H  TRP*     2.8    18.4    -      -       -      +
     23H  PHE*     1.3    75.1    -      -       -      +
     25H  ALA*     1.3    60.5    +      -       -      +
     26H  GLY      2.7     5.9    +      -       -      -
     27H  LEU*     3.1    24.6    +      -       +      +
     28H  ILE*     3.5    12.4    +      -       -      +
    450L  BCL      5.4    12.8    -      -       +      -
    273M  LEU*     6.3     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 25 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21H  TRP      2.9    11.7    +      -       -      +
     22H  ILE*     2.7    22.7    +      -       +      +
     24H  LEU*     1.3    72.6    -      -       -      +
     26H  GLY*     1.3    63.7    +      -       -      +
     28H  ILE*     3.5    26.9    -      -       +      +
     29H  TYR*     4.0     6.1    +      -       -      +
     30H  TYR*     4.7     2.6    -      -       -      -
    450L  BCL      6.0     2.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 26 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22H  ILE      2.7    10.0    +      -       -      -
     23H  PHE*     3.2    11.4    -      -       -      -
     24H  LEU      2.7     2.2    -      -       -      -
     25H  ALA*     1.3    80.1    -      -       -      +
     27H  LEU*     1.3    69.4    +      -       -      +
     30H  TYR*     3.1    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 27 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23H  PHE      3.5     6.4    +      -       -      +
     24H  LEU*     3.1    17.6    +      -       +      +
     26H  GLY*     1.3    73.5    -      -       -      +
     28H  ILE*     1.3    94.1    +      -       +      +
     30H  TYR      2.9     0.2    +      -       -      -
     31H  LEU*     2.9    29.8    +      -       +      +
     32H  GLN*     3.0    51.5    +      -       +      +
    269M  TRP*     3.8    37.0    -      -       +      -
    273M  LEU*     4.7    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 28 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24H  LEU      3.6    11.2    -      -       -      +
     25H  ALA*     3.5    22.2    -      -       +      +
     27H  LEU*     1.3   101.3    -      -       +      +
     29H  TYR*     1.3    76.0    +      -       +      +
     30H  TYR      2.6     9.2    +      -       -      -
     32H  GLN*     3.6    14.8    -      -       -      +
     33H  THR*     3.0    20.9    +      -       -      -
    450L  BCL      4.4    25.8    -      -       +      -
    266M  TRP*     4.9    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 29 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25H  ALA      4.0     3.8    +      -       -      +
     26H  GLY      3.9     1.4    +      -       -      -
     27H  LEU      3.7     0.4    -      -       -      -
     28H  ILE*     1.3    87.7    -      -       +      +
     30H  TYR*     1.3    79.4    +      +       +      +
     33H  THR*     2.7    27.7    +      -       -      +
     36H  MET*     4.7    10.8    -      -       +      +
     57H  PRO*     4.1    34.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 30 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25H  ALA      4.9     2.5    -      -       -      -
     26H  GLY*     3.1    26.7    -      -       -      +
     27H  LEU      2.9     3.0    +      -       -      +
     28H  ILE      2.6     4.8    +      -       -      -
     29H  TYR*     1.3    95.3    -      +       +      +
     31H  LEU*     1.3    72.1    +      -       -      +
     32H  GLN      3.5     0.2    -      -       -      -
     33H  THR*     3.0    17.0    -      -       -      +
     34H  GLU*     3.6     5.7    +      -       -      +
     57H  PRO*     5.5    15.0    -      -       +      -
     59H  PRO*     6.1     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 31 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27H  LEU*     2.9    19.3    +      -       +      +
     30H  TYR*     1.3    79.0    -      -       -      +
     32H  GLN*     1.3    55.4    +      -       -      +
     33H  THR      2.6    13.0    +      -       -      +
     34H  GLU*     3.1    32.8    -      -       +      +
    265M  ARG*     5.1     6.0    -      -       -      +
    269M  TRP*     4.1    27.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 32 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27H  LEU*     3.0    52.1    +      -       +      +
     28H  ILE*     3.4    12.4    -      -       -      +
     31H  LEU*     1.3    78.2    -      -       -      +
     33H  THR*     1.3    64.9    +      -       -      +
    262M  GLY      5.0     0.3    -      -       -      +
    265M  ARG*     5.1     5.1    -      -       -      +
    266M  TRP*     3.0    64.1    +      -       +      -
    269M  TRP*     3.1    45.8    -      -       -      +
    270M  MET*     5.7     3.4    -      -       -      +
    273M  LEU*     5.2     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 33 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28H  ILE*     3.0     6.2    +      -       -      +
     29H  TYR*     2.7    39.2    +      -       -      +
     30H  TYR      3.0     5.6    -      -       -      +
     31H  LEU      2.6     5.9    +      -       -      +
     32H  GLN*     1.3    82.9    -      -       -      +
     34H  GLU*     1.3    87.3    +      -       -      +
     35H  ASN*     2.8    38.9    +      -       +      +
     36H  MET*     4.3    24.9    -      -       +      +
     57H  PRO*     6.5     0.2    -      -       +      -
     59H  PRO*     6.0     3.8    -      -       +      -
    262M  GLY*     4.7     3.6    -      -       -      -
    265M  ARG*     5.1     1.6    -      -       -      -
    266M  TRP*     4.9     3.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 34 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30H  TYR      3.6     3.9    +      -       -      +
     31H  LEU*     3.1    33.4    -      -       +      +
     33H  THR*     1.3    87.3    -      -       -      +
     35H  ASN*     1.3    53.3    -      -       -      -
     36H  MET*     2.9    12.4    +      -       -      +
     37H  ARG*     2.9    66.1    +      -       +      +
     59H  PRO*     4.1    22.7    -      -       +      +
     60H  LYS*     5.6     3.8    -      -       -      -
     62H  LYS*     4.2    10.0    -      -       -      +
    259M  THR*     4.1     5.4    +      -       -      +
    261M  GLU*     5.3     6.6    -      -       -      +
    262M  GLY*     5.7     2.2    -      -       -      -
    265M  ARG*     4.7    21.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 35 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33H  THR*     2.8    28.5    +      -       +      +
     34H  GLU*     1.3    75.8    -      -       -      +
     36H  MET*     1.3    58.1    +      -       +      +
     37H  ARG      3.4     3.1    -      -       -      -
     38H  GLU      3.9     4.9    -      -       -      +
     40H  TYR*     4.0     4.9    -      -       -      -
    256M  PHE*     4.9     6.2    -      -       +      -
    257M  ASN*     3.7    16.1    -      -       -      +
    258M  ALA*     3.3    33.1    -      -       -      +
    259M  THR*     3.7    17.7    -      -       -      +
    262M  GLY*     3.5    13.3    -      -       -      -
    266M  TRP*     2.9    43.3    +      -       -      +
    750M   UQ      4.6     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 36 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29H  TYR*     4.7    13.7    -      -       +      +
     33H  THR*     4.3    21.5    -      -       +      -
     34H  GLU      2.9     2.3    -      -       -      -
     35H  ASN*     1.3    79.6    -      -       -      +
     37H  ARG*     1.3    61.3    +      -       -      +
     38H  GLU      2.9     7.4    -      -       -      -
     40H  TYR*     2.9    77.7    -      -       +      +
     55H  PRO*     5.3     2.7    -      -       +      -
     57H  PRO*     4.1    26.0    -      -       +      -
     58H  LEU*     4.5    26.9    -      -       +      +
     59H  PRO*     5.0    12.3    -      -       +      -
     76H  PRO*     6.0     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 37 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34H  GLU*     2.9    51.4    +      -       +      +
     35H  ASN      3.4     0.6    -      -       -      -
     36H  MET*     1.3    80.2    -      -       -      +
     38H  GLU*     1.3    58.8    +      -       -      +
     40H  TYR      5.0     4.2    -      -       -      +
     59H  PRO*     3.1    33.3    -      -       -      +
     60H  LYS*     3.0    27.5    +      -       -      +
     62H  LYS*     2.9    38.5    -      -       -      +
     64H  PHE*     6.0     0.2    -      -       -      -
     75H  VAL*     3.1    62.3    -      -       +      +
     76H  PRO*     4.2    15.7    -      -       -      +
    259M  THR*     4.3     7.2    -      -       +      -
    261M  GLU*     4.5    13.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 38 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35H  ASN      3.9     5.5    -      -       -      +
     36H  MET      3.7     1.2    -      -       -      -
     37H  ARG*     1.3    85.0    -      -       -      +
     39H  GLY*     1.3    60.4    +      -       -      +
     40H  TYR*     3.1    21.2    -      -       -      -
     73H  LEU*     5.9     1.9    -      -       -      +
     75H  VAL*     3.7    18.7    -      -       +      +
     79H  GLU*     3.4    10.0    -      -       -      +
      5L  PHE*     4.3     8.6    -      -       +      -
    235M  GLN      5.2     0.9    -      -       -      +
    236M  ILE      4.9     7.1    -      -       -      +
    237M  ALA      5.6     2.1    -      -       -      +
    239M  ARG*     2.8    54.9    +      -       +      +
    257M  ASN*     5.1     2.8    +      -       -      +
    258M  ALA      4.7     5.5    -      -       -      +
    259M  THR*     3.7    25.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 39 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38H  GLU*     1.3    74.1    -      -       -      +
     40H  TYR*     1.3    73.7    +      -       -      +
     41H  PRO      3.7     4.3    -      -       -      -
     42H  LEU*     3.0     3.8    -      -       -      +
      3L  LEU*     2.8    26.0    -      -       -      +
      4L  SER*     4.0    13.7    -      -       -      -
      5L  PHE*     3.5    22.9    -      -       -      -
    239M  ARG*     3.7     9.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 40 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35H  ASN      4.0     5.2    -      -       -      -
     36H  MET*     2.9    70.4    -      -       +      +
     37H  ARG      5.0     4.0    -      -       -      +
     38H  GLU      3.1    13.2    -      -       -      -
     39H  GLY*     1.3    92.0    -      -       -      +
     41H  PRO*     1.4    72.3    +      -       +      +
     42H  LEU*     3.2    33.2    -      -       +      +
     55H  PRO*     4.5    10.3    -      -       +      -
     58H  LEU*     4.3    16.4    -      -       +      +
     76H  PRO*     5.3     3.3    -      -       -      +
     77H  GLY      4.0    13.2    -      -       -      +
     78H  PRO      4.9     2.3    -      -       -      +
     79H  GLU*     5.8     1.0    -      -       -      +
      3L  LEU*     4.6     6.1    -      -       +      -
      4L  SER*     4.1     1.8    +      -       -      -
    251M  ARG*     4.5    12.0    +      -       -      -
    257M  ASN*     4.6    10.9    +      -       -      -
----------------------------------------------------------
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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