Contacts of the helix formed by residues 86 - 111 (chain B) in PDB entry 1GUL


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 LEU 86 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  TYR*     4.1    15.7    -      -       +      -
     77A  ASP*     4.2    29.4    -      -       +      +
     78A  LYS*     3.8    35.4    -      -       +      +
     85B  ASN*     1.3    73.0    -      -       -      +
     87B  LYS*     1.3    62.6    +      -       +      +
     89B  ARG*     4.0    15.0    -      -       +      +
     90B  THR*     2.5    53.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 87 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  ASP*     5.2     3.4    +      -       -      +
     63A  MET*     4.2    25.5    -      -       +      +
     74A  TYR*     3.3    34.6    +      -       -      -
     78A  LYS*     4.8     7.1    -      -       -      +
     85B  ASN*     2.8    17.8    +      -       -      +
     86B  LEU*     1.3    90.5    -      -       +      +
     88B  GLU*     1.3    61.0    +      -       +      +
     90B  THR*     3.3     5.2    +      -       -      +
     91B  LEU*     3.2    28.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 88 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83B  GLY*     3.5    14.4    -      -       -      -
     84B  LYS*     2.8    31.5    +      -       -      +
     85B  ASN*     3.0    31.1    +      -       -      +
     87B  LYS*     1.3    72.2    -      -       +      +
     89B  ARG*     1.3    68.0    +      -       -      +
     90B  THR      3.0     1.3    -      -       -      -
     91B  LEU*     2.8    17.3    +      -       +      +
     92B  ILE*     2.9    19.0    +      -       -      +
    149B  VAL*     3.9    19.2    -      -       +      +
    150B  GLY*     4.0    24.4    -      -       -      -
    152B  GLN*     5.5     2.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 89 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  ASP*     4.8     1.8    -      -       -      -
     89A  ARG*     3.6    35.8    -      -       -      +
     73B  HIS*     5.3     2.4    -      -       -      +
     77B  ASP*     2.7    43.0    +      -       -      -
     82B  PHE*     3.6    55.2    +      -       +      +
     85B  ASN      2.8    20.4    +      -       -      +
     86B  LEU*     3.4    21.1    -      -       +      +
     88B  GLU*     1.3    72.5    -      -       -      +
     90B  THR*     1.3    64.5    +      -       -      +
     92B  ILE*     3.6     1.9    -      -       -      +
     93B  ASP*     2.9    27.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  MET*     4.1    22.2    -      -       +      +
     65A  LEU*     4.1    20.2    -      -       +      -
     70A  SER*     5.6     3.4    -      -       -      +
     74A  TYR*     3.8    20.4    -      -       +      +
     86B  LEU*     2.5    46.1    +      -       -      +
     87B  LYS*     3.4     5.8    -      -       -      -
     89B  ARG*     1.3    76.3    -      -       -      +
     91B  LEU*     1.3    62.9    +      -       +      +
     93B  ASP*     3.4     6.3    -      -       +      +
     94B  MET*     3.0    28.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 91 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  MET*     5.8     6.7    -      -       +      -
     87B  LYS*     3.2    19.7    +      -       +      +
     88B  GLU*     2.8    13.6    +      -       +      +
     90B  THR*     1.3    70.9    -      -       +      +
     92B  ILE*     1.3    66.2    +      -       -      +
     94B  MET*     3.2    12.1    +      -       -      +
     95B  TYR*     2.8    55.5    +      -       +      +
    149B  VAL*     4.0    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 92 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  LEU      4.3     0.4    -      -       -      +
     82B  PHE*     3.7    23.1    -      -       +      -
     83B  GLY*     3.5    30.5    -      -       -      +
     88B  GLU      3.1    15.9    -      -       -      +
     89B  ARG      3.6     3.8    -      -       -      +
     91B  LEU*     1.3    75.0    -      -       -      +
     93B  ASP*     1.3    64.5    +      -       -      +
     95B  TYR*     3.6     1.9    -      -       -      +
     96B  VAL*     2.9    32.0    +      -       +      +
    149B  VAL*     3.9    24.7    -      -       +      +
    154B  SER*     3.5    24.2    -      -       -      +
    155B  LEU*     4.2    10.8    -      -       +      -
    156B  ALA*     3.9    26.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 93 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  SER*     3.1    26.4    +      -       -      +
     73A  HIS*     2.9    38.3    +      -       -      +
     73B  HIS*     4.6     4.9    +      -       -      -
     82B  PHE*     4.3    16.9    -      -       +      -
     89B  ARG*     2.9    19.2    +      -       +      +
     90B  THR*     3.4     7.3    -      -       -      +
     92B  ILE*     1.3    77.8    -      -       -      +
     94B  MET*     1.3    64.6    +      -       -      +
     96B  VAL*     3.1     7.1    +      -       -      +
     97B  GLU*     2.8    33.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 94 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  LEU*     4.5    13.0    -      -       +      -
     52A  PHE*     3.6     8.8    -      -       +      -
     64A  LYS      4.2     3.4    -      -       -      +
     65A  LEU*     3.3    29.4    -      -       +      -
     66A  VAL*     2.6    61.0    -      -       +      +
     67A  GLN*     4.2     2.4    -      -       +      +
     70A  SER*     3.8    20.9    -      -       -      -
     90B  THR*     3.0    19.9    +      -       +      +
     91B  LEU*     3.2    15.2    +      -       -      +
     93B  ASP*     1.3    76.5    -      -       -      +
     95B  TYR*     1.3    70.1    -      -       +      +
     97B  GLU*     3.2     2.2    +      -       -      +
     98B  GLY      2.9    20.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 95 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  LEU*     4.0    26.3    -      -       +      +
     52A  PHE*     4.4     6.5    -      +       -      -
     91B  LEU*     2.8    48.8    +      -       +      +
     92B  ILE      3.6     4.0    -      -       -      +
     94B  MET*     1.3    78.5    -      -       +      +
     96B  VAL*     1.3    61.5    +      -       -      +
     98B  GLY*     3.3     0.5    +      -       -      -
     99B  THR*     2.6    34.5    +      -       -      +
    135B  VAL*     5.3     0.4    -      -       +      -
    136B  PHE*     4.0    19.9    -      +       +      -
    139B  ILE*     3.2    33.3    -      -       +      +
    148B  LEU*     4.3    14.8    -      -       +      -
    149B  VAL*     3.4    31.4    -      -       +      -
    156B  ALA*     3.8    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 96 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72B  LEU*     5.4     3.8    -      -       +      -
     73B  HIS*     5.8     4.0    -      -       -      +
     92B  ILE*     2.9    23.6    +      -       +      +
     93B  ASP*     3.3     5.6    -      -       -      +
     95B  TYR*     1.3    80.8    -      -       -      +
     97B  GLU*     1.3    69.9    +      -       -      +
     99B  THR*     3.2     6.3    +      -       -      -
    100B  LEU*     2.8    41.1    +      -       +      +
    155B  LEU*     3.9    24.5    -      -       +      +
    156B  ALA*     3.7    28.9    -      -       -      +
    159B  ILE*     4.5    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 97 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  GLN*     3.4    27.7    -      -       +      +
     69A  ARG*     3.5    18.5    +      -       +      +
     70A  SER*     3.0    26.0    -      -       -      +
     73A  HIS*     4.9     1.0    -      -       -      -
     97A  GLU*     5.5     0.2    -      -       -      +
     69B  ARG*     2.7    44.0    +      -       -      +
     73B  HIS*     4.2    13.7    +      -       -      -
     93B  ASP*     2.8    26.8    +      -       -      +
     94B  MET      3.9     0.2    -      -       -      +
     96B  VAL*     1.3    77.0    -      -       -      +
     98B  GLY*     1.3    65.4    +      -       -      +
    100B  LEU*     3.2     7.2    +      -       -      +
    101B  ASP*     3.1    26.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 98 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  PHE*     3.7    20.6    -      -       -      -
     67A  GLN*     3.4    20.1    -      -       -      +
     94B  MET      2.9    10.5    +      -       -      -
     97B  GLU*     1.3    75.7    -      -       -      +
     99B  THR*     1.3    65.2    +      -       -      +
    101B  ASP*     2.9    19.3    +      -       -      +
    102B  LEU      3.4     1.2    +      -       -      -
    132B  TYR*     3.3    18.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 99 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  PHE*     4.9     0.2    -      -       -      -
     95B  TYR*     2.6    25.8    +      -       -      +
     96B  VAL*     3.6     3.5    -      -       -      -
     98B  GLY*     1.3    76.2    -      -       -      +
    100B  LEU*     1.3    57.0    +      -       -      +
    102B  LEU*     2.8    28.4    +      -       +      +
    103B  LEU*     2.9    12.4    +      -       -      +
    132B  TYR*     4.8     4.0    -      -       -      -
    136B  PHE*     3.6    18.2    -      -       +      -
    156B  ALA      5.3     1.2    +      -       -      -
    159B  ILE*     3.8    20.4    -      -       +      +
    160B  LEU*     4.1    17.9    +      -       +      +
    163B  THR*     3.4    31.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 100 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  SER*     4.6     7.2    -      -       -      +
     68B  THR*     5.6     5.2    -      -       +      -
     69B  ARG*     3.8    48.9    +      -       +      +
     72B  LEU*     4.8    14.6    -      -       +      -
     96B  VAL*     2.8    36.5    +      -       +      +
     97B  GLU*     3.2     8.7    +      -       -      +
     99B  THR*     1.3    71.3    -      -       -      +
    101B  ASP*     1.3    63.4    +      -       -      +
    103B  LEU*     3.7    26.5    -      -       +      +
    104B  GLU*     3.0    26.0    +      -       -      +
    159B  ILE*     3.9    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  GLN*     4.2     4.0    +      -       -      +
     67A  GLN*     3.1    24.9    +      -       -      +
    301A  IBG      3.3    29.8    +      -       -      +
     69B  ARG*     4.6     9.7    +      -       -      -
     97B  GLU      3.1    13.8    +      -       -      +
     98B  GLY      2.9    11.4    +      -       -      +
    100B  LEU*     1.3    80.6    -      -       -      +
    102B  LEU*     1.3    60.9    +      -       -      +
    104B  GLU*     3.6    14.1    -      -       -      +
    105B  LEU*     4.2     8.8    +      -       -      +
    132B  TYR*     3.7    13.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 102 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98B  GLY      3.4     1.9    +      -       -      +
     99B  THR*     2.8    15.2    +      -       +      +
    101B  ASP*     1.3    77.3    -      -       -      +
    103B  LEU*     1.3    66.8    +      -       -      +
    104B  GLU      3.0     2.0    +      -       -      -
    105B  LEU*     3.0    32.8    +      -       +      +
    106B  LEU*     3.9     3.6    +      -       +      +
    124B  MET*     4.4     6.3    -      -       +      +
    127B  LYS*     4.2    18.4    -      -       +      -
    128B  ALA*     4.2    12.3    -      -       +      +
    132B  TYR*     3.7    47.5    +      -       +      -
    133B  PHE*     4.5     6.1    -      -       +      -
    136B  PHE*     6.3     0.4    -      -       +      -
    160B  LEU*     6.0     1.6    -      -       +      -
    163B  THR*     4.0    20.6    -      -       +      -
    167B  LEU*     4.1    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 103 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  SER*     3.8    22.7    -      -       -      +
     99B  THR      2.9    14.0    +      -       -      +
    100B  LEU*     3.7    23.8    -      -       +      +
    102B  LEU*     1.3    78.6    -      -       -      +
    104B  GLU*     1.3    62.7    +      -       -      +
    106B  LEU*     2.8    34.7    +      -       +      +
    107B  ILE*     3.0    29.3    +      -       +      +
    159B  ILE*     4.8     0.2    -      -       +      -
    162B  GLN*     3.8    23.3    -      -       +      +
    163B  THR*     3.8    32.0    -      -       +      +
    166B  ALA*     5.0     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  ARG*     2.9    42.1    +      -       -      -
    100B  LEU      3.0    19.6    +      -       -      +
    101B  ASP*     3.6    12.1    -      -       -      +
    103B  LEU*     1.3    77.5    -      -       -      +
    105B  LEU*     1.3    66.0    +      -       +      +
    107B  ILE*     3.0    11.4    +      -       -      +
    108B  MET*     2.8    53.2    +      -       -      +
    301B  IBG      5.0     0.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101B  ASP      4.3     8.5    -      -       -      +
    102B  LEU*     3.3    22.4    -      -       +      +
    104B  GLU*     1.3    79.9    -      -       +      +
    106B  LEU*     1.3    64.3    +      -       +      +
    108B  MET*     4.0    24.3    -      -       +      +
    109B  HIS*     3.1    24.4    +      -       -      +
    120B  GLU*     5.0     8.5    -      -       -      +
    123B  ASN*     4.1    20.6    -      -       -      +
    124B  MET*     3.8    46.1    -      -       +      +
    127B  LYS*     4.2    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 106 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102B  LEU*     4.1    11.0    -      -       +      +
    103B  LEU*     2.8    28.1    +      -       +      +
    105B  LEU*     1.3    82.9    -      -       +      +
    107B  ILE*     1.4    62.4    +      -       +      +
    109B  HIS*     3.3    17.6    -      -       -      +
    110B  PRO*     3.3     7.1    -      -       -      +
    124B  MET*     3.8    24.9    -      -       +      -
    163B  THR*     4.8     1.6    -      -       +      -
    166B  ALA*     4.1    30.3    -      -       +      +
    167B  LEU*     3.9    30.5    -      -       +      -
    170B  LYS*     4.2    20.8    +      -       +      -
    208B  PRO*     5.9     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  GLY*     3.9    27.9    -      -       -      +
     15B  ARG*     4.0    32.8    -      -       +      +
     18B  SER*     6.0     0.2    -      -       -      +
    103B  LEU*     3.0    32.5    +      -       +      +
    104B  GLU*     3.5    23.6    -      -       -      +
    106B  LEU*     1.4    77.1    -      -       +      +
    108B  MET*     1.3    61.0    +      -       -      +
    110B  PRO*     3.5    11.1    -      -       -      +
    111B  PHE*     3.6    14.0    -      -       -      -
    301B  IBG      3.6    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 108 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104B  GLU*     2.8    45.9    +      -       -      +
    105B  LEU*     4.0    28.9    -      -       +      +
    107B  ILE*     1.3    73.8    -      -       -      +
    109B  HIS*     1.3    66.9    +      -       -      +
    110B  PRO*     3.3     0.2    -      -       -      -
    111B  PHE*     2.9    24.1    +      -       -      +
    112B  LEU*     3.7    20.6    +      -       +      +
    120B  GLU*     5.4     6.7    -      -       -      +
    301B  IBG      4.6    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 109 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  LEU      3.1    12.2    +      -       -      +
    106B  LEU      3.3    11.9    -      -       -      +
    108B  MET*     1.3    75.1    -      -       -      +
    110B  PRO*     1.3    69.8    -      -       +      +
    111B  PHE      3.0     1.6    +      -       -      -
    112B  LEU*     3.1    21.1    +      -       +      +
    117B  GLN*     2.8    66.6    +      -       +      -
    118B  GLN*     5.7     0.7    -      -       -      -
    120B  GLU*     3.9    12.8    -      -       +      -
    121B  VAL*     3.7    13.4    -      -       +      +
    124B  MET*     3.6    19.7    -      -       +      -
    170B  LYS*     2.7    32.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106B  LEU      3.3    11.2    -      -       -      +
    107B  ILE      3.5     9.2    -      -       -      +
    108B  MET      3.3     4.5    -      -       -      -
    109B  HIS*     1.3    99.3    -      -       +      +
    111B  PHE*     1.3    70.3    +      -       +      +
    112B  LEU      3.3     3.9    +      -       -      +
    117B  GLN*     3.6    14.5    +      -       -      +
    170B  LYS*     5.5     2.0    -      -       -      +
    208B  PRO*     3.8    29.4    -      -       +      +
    212B  TYR*     5.4     0.9    -      -       +      -
    213B  VAL*     3.8    32.8    -      -       +      +
    217B  TYR*     5.1     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  ILE      3.6    23.8    -      -       -      -
    108B  MET*     2.9    10.9    +      -       +      +
    110B  PRO*     1.3    88.3    -      -       +      +
    112B  LEU*     1.3    65.5    -      -       -      +
    113B  LYS*     4.6     6.4    +      -       -      +
    212B  TYR*     3.9    20.0    -      +       -      -
    213B  VAL*     3.8    19.3    -      -       +      -
    216B  VAL*     3.0    36.3    -      -       +      -
    217B  TYR*     3.7    37.5    +      +       +      +
    301B  IBG      4.1    32.8    -      +       +      -
----------------------------------------------------------
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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