Contacts of the helix formed by residues 28 - 53 (chain B) in PDB entry 2OKC


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 GLY 28 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  ALA*     5.3     2.7    -      -       -      -
     26B  GLY      3.6     5.3    +      -       -      -
     27B  ILE*     1.3    78.3    -      -       -      +
     29B  PHE*     1.3    59.9    +      -       -      -
     30B  THR*     3.4     2.7    -      -       -      -
     31B  ASP*     3.4    11.6    +      -       -      +
     32B  TYR*     3.0    25.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 29 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  TRP*     5.2     8.5    -      +       +      -
     19B  ALA*     3.6    31.4    -      -       +      -
     23B  ALA*     5.9     1.9    -      -       -      +
     28B  GLY*     1.3    72.4    -      -       -      -
     30B  THR*     1.3    57.4    +      -       -      +
     32B  TYR*     3.1    12.4    +      +       -      +
     33B  ILE*     2.9    59.7    +      -       +      +
    137B  ILE*     3.4    33.2    -      -       +      -
    140B  LYS*     5.4     5.2    -      -       +      -
    141B  ASN*     3.1    32.5    -      -       +      +
    144B  ASP*     5.7     3.6    -      -       -      +
    147B  SER*     4.7     7.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 30 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28B  GLY      5.2     0.2    -      -       -      -
     29B  PHE*     1.3    78.9    -      -       -      +
     31B  ASP*     1.3    57.4    +      -       -      +
     33B  ILE*     3.6     5.0    +      -       -      +
     34B  THR*     2.7    33.3    +      -       -      -
    141B  ASN*     3.2    19.8    +      -       -      +
    147B  SER*     4.4     7.9    +      -       -      -
    149B  ALA*     3.4    17.0    -      -       -      +
    152B  TYR*     4.6    13.4    -      -       +      -
    218B  LEU*     3.5    37.0    -      -       +      -
    222B  LEU*     5.2     4.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 31 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  ILE*     4.3     9.8    -      -       +      -
     28B  GLY*     3.4    14.6    +      -       -      +
     29B  PHE      3.4     0.4    -      -       -      -
     30B  THR*     1.3    77.4    -      -       -      +
     32B  TYR*     1.3    64.6    +      -       -      +
     34B  THR*     3.4     6.2    +      -       -      -
     35B  GLN*     3.0    30.3    +      -       -      +
    103B  LYS*     3.6    43.6    -      -       +      +
    218B  LEU*     4.3    15.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 32 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  VAL*     2.8    36.3    +      -       +      +
     18B  LEU*     3.5    26.2    -      -       +      +
     19B  ALA*     3.6    34.1    -      -       +      +
     22B  LEU*     3.7    23.1    -      -       +      -
     27B  ILE*     4.1    13.4    -      -       +      +
     28B  GLY      3.0    14.1    +      -       -      +
     29B  PHE*     3.1    18.8    +      +       -      +
     31B  ASP*     1.3    76.7    -      -       -      +
     33B  ILE*     1.3    55.6    +      -       -      +
     35B  GLN*     3.3     6.4    +      -       +      +
     36B  LEU*     2.8    52.2    +      -       +      +
    104B  ILE*     5.5     0.4    -      -       +      -
    113B  VAL*     4.3    11.9    -      -       +      -
    116B  MSE      3.5    16.3    -      -       -      +
    137B  ILE*     4.7     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 33 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29B  PHE*     2.9    55.7    +      -       +      +
     30B  THR*     4.0     5.4    -      -       -      +
     32B  TYR*     1.3    76.0    -      -       +      +
     34B  THR*     1.4    54.0    +      -       -      +
     36B  LEU*     3.6    10.9    -      -       +      +
     37B  THR*     2.8    39.8    +      -       -      +
    134B  TYR*     4.6     8.3    -      -       +      +
    137B  ILE*     4.2    19.5    -      -       +      +
    138B  LEU*     4.4    17.3    -      -       +      -
    141B  ASN*     3.4    23.3    -      -       +      +
    222B  LEU*     3.5    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 34 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  THR      2.7    21.8    +      -       -      -
     31B  ASP*     3.6     8.8    -      -       -      -
     33B  ILE*     1.4    75.4    -      -       -      +
     35B  GLN*     1.3    69.4    +      -       -      +
     37B  THR*     3.2     4.5    +      -       -      -
     38B  TYR*     3.0    56.7    +      -       +      +
    101B  GLN      5.3     0.2    -      -       -      +
    218B  LEU*     3.6    39.0    -      -       +      +
    221B  THR*     4.5     4.7    -      -       +      -
    222B  LEU*     4.1    11.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 35 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31B  ASP*     3.0    19.4    +      -       -      +
     32B  TYR      3.8     3.6    -      -       -      +
     34B  THR*     1.3    76.3    -      -       -      +
     36B  LEU*     1.3    65.5    +      -       -      +
     38B  TYR*     3.4    16.3    +      -       -      +
     39B  LEU*     3.0    34.7    +      -       +      +
     79B  TYR*     2.6    39.9    +      -       +      +
    101B  GLN      2.9    24.2    +      -       -      -
    102B  ASN*     3.5     4.7    -      -       -      +
    103B  LYS*     3.4    22.2    -      -       +      +
    104B  ILE*     3.9    33.2    -      -       +      -
    113B  VAL*     5.6     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 36 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  VAL*     3.8    31.0    -      -       +      -
     32B  TYR*     2.8    31.2    +      -       +      +
     33B  ILE*     3.6    11.9    -      -       +      +
     35B  GLN*     1.3    78.8    -      -       -      +
     37B  THR*     1.3    57.7    +      -       -      +
     39B  LEU*     3.5     1.9    +      -       -      +
     40B  LEU*     2.9    37.1    +      -       +      +
    113B  VAL*     4.0    21.9    -      -       +      +
    116B  MSE      4.0    11.7    -      -       +      -
    117B  ILE*     3.4    32.5    -      -       +      -
    122B  TRP*     5.8     0.9    -      -       +      -
    134B  TYR*     6.2     4.9    -      -       +      -
    137B  ILE*     5.2     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 37 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33B  ILE      2.8    21.6    +      -       -      -
     34B  THR*     3.5     6.1    -      -       -      -
     36B  LEU*     1.3    74.0    -      -       -      +
     38B  TYR*     1.3    66.3    +      -       -      +
     40B  LEU*     4.3     5.8    -      -       -      -
     41B  PHE*     3.0    24.6    +      -       -      +
     96B  ILE*     4.7     5.4    -      -       +      -
    134B  TYR*     2.6    30.3    +      -       -      +
    221B  THR*     3.7    23.6    -      -       +      -
    222B  LEU*     3.7     1.4    -      -       -      +
    225B  MSE      3.5    35.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 38 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34B  THR*     3.0    30.3    +      -       +      +
     35B  GLN*     3.5    30.5    -      -       -      +
     37B  THR*     1.3    76.4    -      -       -      +
     39B  LEU*     1.3    63.1    +      -       -      +
     42B  LEU*     3.2     8.0    +      -       -      +
     79B  TYR*     3.5     9.0    -      -       +      +
     83B  LEU*     3.7    15.7    -      -       +      -
     96B  ILE*     3.6    22.9    -      -       +      -
     97B  TYR*     2.6    48.6    +      +       +      -
     98B  THR      4.5     2.3    +      -       -      -
     99B  LYS      4.5     1.0    +      -       -      -
    100B  ALA*     3.4    19.1    -      -       +      -
    101B  GLN*     3.2    41.6    +      -       -      +
    217B  PRO*     6.1     0.3    -      -       -      +
    218B  LEU*     5.2     3.5    -      -       -      +
    221B  THR*     3.7    17.2    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 39 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35B  GLN*     3.0    20.7    +      -       +      +
     36B  LEU      3.9     2.7    -      -       -      +
     38B  TYR*     1.3    81.2    -      -       -      +
     40B  LEU*     1.3    57.3    +      -       -      +
     42B  LEU*     3.1     9.1    +      -       +      +
     43B  LYS*     2.9    23.9    +      -       -      +
     64B  TRP*     3.4    17.1    -      -       +      -
     67B  LEU*     3.4    33.4    -      -       +      -
     79B  TYR*     3.5    26.5    -      -       +      +
    110B  LEU*     4.6     6.7    -      -       +      -
    113B  VAL*     3.8    27.8    -      -       +      -
    114B  ILE*     3.8    22.2    -      -       +      +
    117B  ILE*     4.3     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 40 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36B  LEU*     2.9    25.4    +      -       +      +
     37B  THR*     3.8     2.5    -      -       -      +
     39B  LEU*     1.3    73.3    -      -       -      +
     41B  PHE*     1.3    65.9    +      -       -      +
     43B  LYS*     4.4     3.4    -      -       -      -
     44B  MSE      3.0    37.5    +      -       +      +
    117B  ILE*     4.2    12.0    -      -       +      +
    122B  TRP*     3.3    63.9    -      -       +      +
    134B  TYR*     5.4    11.0    -      -       +      -
    225B  MSE      3.7    23.3    -      -       +      -
    229B  LEU*     5.5     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 41 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37B  THR      3.0    18.1    +      -       -      +
     40B  LEU*     1.3    76.0    -      -       -      +
     42B  LEU*     1.3    62.5    +      -       -      +
     44B  MSE      3.5     6.2    +      -       +      +
     45B  ASP*     3.1    26.1    +      -       +      +
     58B  ILE*     5.1     6.5    -      -       +      -
     92B  LEU*     4.0    20.0    -      -       +      -
     93B  ILE*     3.7    30.7    -      -       +      -
     96B  ILE*     3.9    34.5    -      -       +      -
     97B  TYR*     3.6    25.1    -      +       -      +
    225B  MSE      3.9    11.9    -      -       +      +
    228B  TYR*     3.8    36.8    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 42 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38B  TYR      3.2    12.0    +      -       -      +
     39B  LEU*     3.1    12.0    +      -       +      +
     41B  PHE*     1.3    74.4    -      -       -      +
     43B  LYS*     1.3    63.9    +      -       -      +
     45B  ASP*     3.4     4.9    +      -       -      +
     46B  ALA*     3.3    15.6    +      -       -      +
     58B  ILE*     3.6    31.9    -      -       +      -
     62B  TYR      3.8    17.5    -      -       -      +
     63B  GLN*     4.3     3.4    -      -       -      +
     64B  TRP*     3.9    40.1    +      -       +      +
     67B  LEU*     4.0    20.6    -      -       +      -
     79B  TYR*     5.9     1.8    -      -       +      -
     82B  THR*     4.1    16.6    -      -       +      -
     86B  LEU*     4.1    11.4    -      -       +      -
     97B  TYR*     3.5     4.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 43 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39B  LEU      2.9     9.7    +      -       -      +
     40B  LEU*     3.8     3.8    -      -       -      +
     42B  LEU*     1.3    74.8    -      -       -      +
     44B  MSE      1.3    64.3    +      -       -      +
     46B  ALA*     3.0     8.3    +      -       +      +
     47B  GLU*     3.0    58.3    +      -       -      +
     64B  TRP*     3.4    36.0    -      -       +      +
    117B  ILE*     3.4    31.2    -      -       +      -
    118B  ASP*     3.6    31.6    -      -       -      -
    120B  GLU      3.6    11.9    +      -       -      -
    121B  GLN*     4.9     2.0    -      -       -      +
    122B  TRP*     3.8     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MSE 44 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40B  LEU*     3.0    37.9    +      -       +      +
     41B  PHE*     3.9     5.8    -      -       +      +
     43B  LYS*     1.3    78.1    -      -       -      +
     45B  ASP*     1.3    61.4    +      -       -      +
     47B  GLU*     3.3     8.1    +      -       -      +
     48B  ASN*     3.1    23.0    +      -       -      +
    122B  TRP*     3.9    24.9    -      -       +      -
    123B  LEU*     3.5    32.9    -      -       +      +
    130B  LYS*     4.0    19.1    -      -       -      +
    225B  MSE      4.4     7.0    -      -       -      -
    228B  TYR*     3.9    31.0    -      -       +      +
    229B  LEU*     4.2    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 45 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  PHE*     3.1    23.0    +      -       +      +
     42B  LEU      3.7     6.3    -      -       -      +
     43B  LYS      3.2     0.4    -      -       -      -
     44B  MSE      1.3    76.5    -      -       -      +
     46B  ALA*     1.3    63.0    +      -       -      +
     48B  ASN*     3.3    10.3    +      -       -      +
     49B  VAL*     3.2    20.3    +      -       -      +
     56B  SER*     2.6    48.7    +      -       -      +
     58B  ILE*     3.8    21.1    -      -       +      +
     63B  GLN*     5.8     1.2    -      -       -      +
     93B  ILE*     4.9     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 46 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42B  LEU      3.3     2.6    +      -       -      +
     43B  LYS*     3.0    11.4    +      -       +      +
     45B  ASP*     1.3    80.3    +      -       -      +
     47B  GLU*     1.3    59.6    +      -       +      +
     48B  ASN      3.1     0.2    -      -       -      -
     49B  VAL*     3.5     7.6    +      -       -      +
     50B  GLU*     3.0    29.8    +      -       -      +
     63B  GLN*     6.1     1.8    -      -       +      -
     64B  TRP*     3.8    31.6    -      -       +      +
     65B  ALA      5.4     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 47 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43B  LYS*     3.0    43.8    +      -       -      +
     44B  MSE      3.3    10.8    +      -       -      +
     46B  ALA*     1.3    76.1    -      -       +      +
     48B  ASN*     1.3    56.9    +      -       -      +
     50B  GLU*     3.7     7.2    -      -       -      +
     51B  MSE      2.9    38.9    +      -       +      +
    121B  GLN*     3.2    12.5    -      -       -      +
    122B  TRP*     2.9    50.2    +      -       -      +
    123B  LEU*     3.3    23.6    +      -       +      +
    124B  ILE*     4.5     2.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 48 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44B  MSE      3.1    13.1    +      -       -      +
     45B  ASP*     3.5    14.5    +      -       -      +
     46B  ALA      3.1     0.2    -      -       -      -
     47B  GLU*     1.3    75.0    -      -       -      +
     49B  VAL*     1.3    60.8    +      -       -      +
     51B  MSE      4.4     1.6    -      -       -      +
     52B  PHE*     2.9    61.7    +      -       -      +
     54B  GLU*     3.2    35.7    +      -       -      +
     55B  GLU      5.0     2.8    +      -       -      -
    123B  LEU*     3.4    11.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 49 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45B  ASP*     3.2    16.1    +      -       -      +
     46B  ALA*     3.7     8.5    -      -       -      +
     48B  ASN*     1.3    78.3    -      -       -      +
     50B  GLU*     1.3    58.1    +      -       -      +
     53B  GLY*     3.0    30.6    +      -       -      -
     54B  GLU      3.6    26.0    -      -       -      +
     55B  GLU*     3.8    12.1    -      -       -      +
     56B  SER*     3.8    19.7    -      -       -      -
     63B  GLN*     5.9     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 50 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46B  ALA      3.0    16.4    +      -       -      +
     47B  GLU*     3.7     8.0    -      -       -      +
     48B  ASN      3.3     0.2    -      -       -      -
     49B  VAL*     1.3    82.9    -      -       -      +
     51B  MSE      1.3    63.2    +      -       +      +
     53B  GLY      4.7     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with MSE 51 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  TRP*     6.2     2.9    -      -       +      -
     20A  THR*     5.2     9.6    -      -       +      -
     47B  GLU*     2.9    25.9    +      -       +      +
     48B  ASN      4.3     0.4    -      -       -      +
     49B  VAL      3.3     0.2    -      -       -      -
     50B  GLU*     1.3    85.4    -      -       +      +
     52B  PHE*     1.3   100.6    +      -       +      +
     53B  GLY      3.5     1.2    +      -       -      -
    123B  LEU*     4.1    21.5    -      -       -      +
    124B  ILE*     4.0    29.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 52 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  LYS*     4.3    30.7    -      -       +      -
     16A  TRP*     5.2    12.1    -      -       +      -
     17A  ASN*     6.1     4.0    -      -       +      -
     48B  ASN*     2.9    34.9    +      -       -      +
     51B  MSE      1.3   119.0    -      -       +      +
     53B  GLY*     1.3    56.9    +      -       -      +
     54B  GLU*     2.8    34.1    +      -       -      +
    123B  LEU*     4.6    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 53 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49B  VAL*     3.0    17.3    +      -       -      -
     50B  GLU      4.7     0.4    +      -       -      -
     51B  MSE      3.5     2.6    +      -       -      -
     52B  PHE*     1.3    74.6    -      -       -      +
     54B  GLU*     1.3    64.0    +      -       -      +
     55B  GLU      3.9     0.3    +      -       -      -
----------------------------------------------------------
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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