Contacts of the helix formed by residues 86 - 111 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  ASN*     1.3    73.9    -      -       -      +
     87A  LYS*     1.3    62.4    -      -       +      +
     89A  ARG*     4.0    15.7    -      -       +      +
     90A  THR*     2.5    53.5    +      -       -      +
     74B  TYR*     3.9    18.8    -      -       +      -
     77B  ASP*     4.1    28.9    -      -       +      +
     78B  LYS*     3.8    33.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 87 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  ASN*     2.8    18.2    +      -       -      +
     86A  LEU*     1.3    88.7    -      -       +      +
     88A  GLU*     1.3    60.6    -      -       +      +
     90A  THR*     3.3     5.6    +      -       -      +
     91A  LEU*     3.2    28.0    +      -       +      +
     61B  ASP*     5.1     3.2    +      -       -      +
     63B  MET*     3.9    26.6    -      -       +      +
     74B  TYR*     3.3    36.0    +      -       -      -
     78B  LYS*     5.0     6.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 88 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  GLY*     3.5    14.5    -      -       -      -
     84A  LYS*     2.8    32.7    +      -       -      +
     85A  ASN*     3.0    31.6    +      -       -      +
     87A  LYS*     1.3    71.8    -      -       +      +
     89A  ARG*     1.3    68.2    +      -       -      +
     90A  THR      3.0     1.3    -      -       -      -
     91A  LEU*     2.8    17.6    +      -       +      +
     92A  ILE*     2.9    19.6    +      -       -      +
    149A  VAL*     3.9    20.3    -      -       +      +
    150A  GLY*     4.0    24.1    -      -       -      -
    152A  GLN*     5.5     2.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 89 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  HIS*     5.3     2.6    -      -       -      +
     77A  ASP*     2.7    43.4    +      -       -      -
     82A  PHE*     3.6    57.2    +      -       +      +
     85A  ASN      2.8    19.7    +      -       -      +
     86A  LEU*     3.4    21.3    -      -       +      +
     88A  GLU*     1.3    72.6    -      -       -      +
     90A  THR*     1.3    65.4    +      -       -      +
     92A  ILE*     3.4     1.5    +      -       -      +
     93A  ASP*     2.9    27.3    +      -       +      +
     77B  ASP*     4.8     1.8    -      -       -      -
     89B  ARG*     3.6    36.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  LEU*     2.5    45.5    +      -       -      +
     87A  LYS*     3.4     6.9    -      -       -      -
     89A  ARG*     1.3    76.1    -      -       -      +
     91A  LEU*     1.3    62.7    +      -       +      +
     93A  ASP*     3.3     6.7    +      -       +      +
     94A  MET*     3.0    29.6    +      -       +      +
     63B  MET*     4.2    12.6    -      -       +      -
     65B  LEU*     4.0    32.5    -      -       +      -
     70B  SER*     5.5     4.7    -      -       -      +
     74B  TYR*     3.9    15.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 91 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  LYS*     3.2    19.0    +      -       +      +
     88A  GLU*     2.8    14.0    +      -       +      +
     90A  THR*     1.3    71.3    -      -       +      +
     92A  ILE*     1.3    66.9    +      -       -      +
     94A  MET*     3.2    11.3    +      -       -      +
     95A  TYR*     2.8    56.8    +      -       +      +
    149A  VAL*     4.0    21.5    -      -       +      -
     51B  LEU*     6.2     0.7    -      -       +      -
     63B  MET*     6.0     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 92 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  LEU      4.3     0.4    -      -       -      +
     82A  PHE*     3.7    23.3    -      -       +      -
     83A  GLY*     3.5    31.0    -      -       -      +
     88A  GLU      3.1    14.6    -      -       -      +
     89A  ARG      3.6     3.6    -      -       -      +
     91A  LEU*     1.3    75.3    -      -       -      +
     93A  ASP*     1.3    64.5    +      -       -      +
     95A  TYR*     3.3     2.2    +      -       -      +
     96A  VAL*     2.9    30.7    +      -       +      +
    149A  VAL*     3.9    23.8    -      -       +      +
    154A  SER*     3.5    24.5    -      -       -      +
    155A  LEU*     4.2    10.5    -      -       +      -
    156A  ALA*     3.9    26.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  HIS*     4.6     4.4    +      -       -      -
     82A  PHE*     4.3    17.3    -      -       +      -
     89A  ARG*     2.9    20.1    +      -       +      +
     90A  THR*     3.4     7.7    -      -       -      +
     92A  ILE*     1.3    78.1    -      -       -      +
     94A  MET*     1.3    63.3    +      -       -      +
     96A  VAL*     3.1     7.5    +      -       -      +
     97A  GLU*     2.8    35.5    +      -       -      +
     70B  SER*     2.9    30.0    +      -       -      +
     73B  HIS*     2.8    36.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  THR*     3.0    18.8    +      -       +      +
     91A  LEU*     3.6    15.0    -      -       -      +
     93A  ASP*     1.3    77.3    -      -       -      +
     95A  TYR*     1.3    70.5    +      -       +      +
     97A  GLU*     3.2     2.0    +      -       -      +
     98A  GLY      2.9    19.6    +      -       -      -
     51B  LEU*     4.4    13.7    -      -       +      -
     52B  PHE*     3.5     9.5    -      -       +      -
     64B  LYS      4.2     3.4    -      -       -      +
     65B  LEU*     3.4    25.6    -      -       +      -
     66B  VAL*     2.5    69.1    -      -       +      +
     67B  GLN*     4.1     4.0    -      -       +      +
     70B  SER*     3.8    15.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  LEU*     2.8    47.7    +      -       +      +
     92A  ILE      3.6     3.6    -      -       -      +
     94A  MET*     1.3    78.4    -      -       +      +
     96A  VAL*     1.3    61.4    +      -       -      +
     98A  GLY*     3.8     0.7    -      -       -      -
     99A  THR*     2.6    34.7    +      -       -      +
    135A  VAL*     5.3     0.2    -      -       +      -
    136A  PHE*     4.0    19.9    -      +       +      -
    139A  ILE*     3.2    34.4    -      -       +      +
    148A  LEU*     4.3    14.5    +      -       +      -
    149A  VAL*     3.4    33.0    -      -       +      -
    156A  ALA*     3.8    19.7    -      -       +      +
     51B  LEU*     4.0    27.9    -      -       +      +
     52B  PHE*     4.2     6.3    -      +       -      -
----------------------------------------------------------
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Residues in contact with VAL 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  LEU*     5.4     3.6    -      -       +      -
     73A  HIS*     5.8     3.6    -      -       -      +
     92A  ILE      2.9    23.2    +      -       -      +
     93A  ASP*     3.3     7.0    -      -       -      +
     95A  TYR*     1.3    80.2    -      -       -      +
     97A  GLU*     1.3    71.3    +      -       -      +
     99A  THR*     3.2     5.5    +      -       -      -
    100A  LEU*     2.8    41.7    +      -       +      +
    155A  LEU*     3.9    24.9    -      -       +      +
    156A  ALA*     3.7    29.2    -      -       -      +
    159A  ILE*     4.5    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ARG*     2.7    44.3    +      -       -      +
     73A  HIS*     4.2    13.9    +      -       -      -
     93A  ASP*     2.8    26.1    +      -       -      +
     96A  VAL*     1.3    76.5    -      -       -      +
     98A  GLY*     1.3    65.4    +      -       -      +
    100A  LEU*     3.2     6.9    +      -       -      +
    101A  ASP*     3.1    26.6    +      -       -      +
     67B  GLN*     3.3    29.0    -      -       +      +
     69B  ARG*     3.5    21.1    +      -       +      +
     70B  SER*     3.2    23.1    -      -       -      +
     73B  HIS*     5.1     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  MET      2.9    14.6    +      -       -      -
     95A  TYR      3.8     0.9    -      -       -      -
     97A  GLU*     1.3    76.1    -      -       -      +
     99A  THR*     1.3    63.8    +      -       -      +
    101A  ASP*     2.9    20.0    +      -       -      +
    102A  LEU      3.4     1.2    +      -       -      -
    132A  TYR*     3.3    22.2    -      -       -      -
     52B  PHE*     3.8    11.7    -      -       -      -
     67B  GLN*     3.4    20.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  TYR*     2.6    25.1    +      -       -      +
     96A  VAL*     3.6     3.6    -      -       -      -
     98A  GLY*     1.3    77.4    -      -       -      +
    100A  LEU*     1.3    53.7    +      -       -      +
    102A  LEU*     2.8    31.1    +      -       +      +
    103A  LEU*     2.9    11.9    +      -       -      +
    132A  TYR*     4.5     3.9    -      -       -      -
    136A  PHE*     3.6    18.8    -      -       +      -
    156A  ALA      5.3     1.4    +      -       -      -
    159A  ILE*     3.8    20.4    -      -       +      +
    160A  LEU*     4.1    17.9    -      -       +      +
    163A  THR*     3.4    31.2    -      -       +      +
     52B  PHE*     5.1     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  SER*     4.6     6.7    -      -       -      +
     68A  THR*     5.6     5.4    -      -       +      -
     69A  ARG*     3.8    50.2    +      -       +      +
     72A  LEU*     4.8    14.1    -      -       +      -
     96A  VAL*     2.8    38.4    +      -       +      +
     97A  GLU*     3.2     7.2    +      -       -      +
     99A  THR*     1.3    70.7    -      -       -      +
    101A  ASP*     1.3    63.4    +      -       -      +
    103A  LEU*     3.7    27.3    -      -       +      +
    104A  GLU*     3.0    26.2    +      -       -      +
    159A  ILE*     3.9    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ARG*     4.6     9.5    +      -       -      -
     97A  GLU      3.1    13.9    +      -       -      +
     98A  GLY      2.9    11.9    +      -       -      +
    100A  LEU*     1.3    81.4    -      -       -      +
    102A  LEU*     1.3    60.3    +      -       -      +
    104A  GLU*     3.6    14.2    -      -       -      +
    105A  LEU*     4.2     9.0    +      -       -      +
    132A  TYR*     3.7    14.5    +      -       -      +
     54B  GLN*     4.2     4.8    +      -       -      +
     67B  GLN*     3.4    18.0    +      -       -      +
    301B  IBG      3.4    33.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 102 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  GLY      3.4     1.7    +      -       -      +
     99A  THR*     2.8    16.0    +      -       +      +
    101A  ASP*     1.3    77.7    -      -       -      +
    103A  LEU*     1.3    66.5    +      -       -      +
    104A  GLU      3.0     3.0    +      -       -      -
    105A  LEU*     3.0    32.6    +      -       +      +
    106A  LEU*     3.9     3.5    +      -       +      +
    124A  MET*     4.4     6.5    -      -       +      +
    127A  LYS*     4.2    18.2    -      -       +      -
    128A  ALA*     4.2    12.6    -      -       +      +
    132A  TYR*     3.7    48.0    +      -       +      -
    133A  PHE*     4.5     6.3    -      -       +      -
    136A  PHE*     6.3     0.4    -      -       +      -
    160A  LEU*     6.0     1.3    -      -       +      -
    163A  THR*     4.0    20.9    -      -       +      -
    167A  LEU*     4.1    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  SER*     3.8    22.0    -      -       -      +
     99A  THR      2.9    14.2    +      -       -      +
    100A  LEU*     3.7    22.7    -      -       +      +
    102A  LEU*     1.3    77.7    -      -       -      +
    104A  GLU*     1.3    63.4    +      -       -      +
    106A  LEU*     2.8    34.6    +      -       +      +
    107A  ILE*     3.0    29.0    +      -       +      +
    159A  ILE*     4.8     0.9    -      -       +      -
    162A  GLN*     3.8    23.6    -      -       +      +
    163A  THR*     3.8    31.8    -      -       +      +
    166A  ALA*     5.0     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15A  ARG*     2.9    42.2    +      -       -      -
    100A  LEU      3.0    18.7    +      -       -      +
    101A  ASP*     3.6    12.6    -      -       -      +
    103A  LEU*     1.3    77.3    -      -       -      +
    105A  LEU*     1.3    65.4    +      -       +      +
    107A  ILE*     3.0    12.4    +      -       -      +
    108A  MET*     2.8    52.3    +      -       -      +
    301A  IBG      5.0     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  ASP      4.3     9.0    -      -       -      +
    102A  LEU*     3.3    22.0    -      -       +      +
    104A  GLU*     1.3    80.2    -      -       +      +
    106A  LEU*     1.3    64.8    +      -       +      +
    108A  MET*     4.0    25.2    -      -       +      +
    109A  HIS*     3.1    24.8    +      -       -      +
    120A  GLU*     5.0     7.9    -      -       -      +
    123A  ASN*     4.1    20.2    -      -       -      +
    124A  MET*     3.8    44.8    -      -       +      +
    127A  LYS*     4.2    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  LEU*     4.1    11.0    -      -       +      +
    103A  LEU*     2.8    26.1    +      -       +      +
    105A  LEU*     1.3    83.8    -      -       +      +
    107A  ILE*     1.4    62.5    +      -       +      +
    109A  HIS*     3.3    17.4    -      -       -      +
    110A  PRO*     3.3     7.1    -      -       -      +
    124A  MET*     3.8    24.2    -      -       +      -
    163A  THR*     4.8     1.6    -      -       +      -
    166A  ALA*     4.1    30.1    -      -       +      +
    167A  LEU*     3.9    30.1    -      -       +      -
    170A  LYS*     4.2    21.4    +      -       +      -
    208A  PRO*     5.9     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  GLY*     3.9    28.3    -      -       -      +
     15A  ARG*     4.0    32.1    -      -       +      +
     18A  SER*     6.0     0.2    -      -       -      +
    100A  LEU      6.0     0.2    -      -       -      +
    103A  LEU*     3.0    32.1    +      -       +      +
    104A  GLU*     3.0    23.5    +      -       -      +
    106A  LEU*     1.4    77.4    -      -       +      +
    108A  MET*     1.3    60.2    +      -       -      +
    110A  PRO*     3.5    10.4    -      -       -      +
    111A  PHE*     3.6    14.4    -      -       -      -
    301A  IBG      3.6    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  GLU*     2.8    45.4    +      -       -      +
    105A  LEU*     4.0    29.2    -      -       +      +
    107A  ILE*     1.3    73.0    -      -       -      +
    109A  HIS*     1.3    66.5    +      -       -      +
    110A  PRO*     3.3     0.7    -      -       -      -
    111A  PHE*     2.9    24.2    +      -       -      +
    112A  LEU*     3.7    20.4    +      -       +      +
    120A  GLU*     5.4     7.0    -      -       -      +
    301A  IBG      4.6    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  LEU      3.1    11.1    +      -       -      +
    106A  LEU*     3.3    11.7    -      -       -      +
    108A  MET*     1.3    75.8    -      -       -      +
    110A  PRO*     1.3    69.6    -      -       +      +
    111A  PHE      3.0     1.4    +      -       -      -
    112A  LEU*     3.1    21.6    +      -       +      +
    117A  GLN*     2.8    66.6    +      -       +      -
    118A  GLN*     5.7     0.7    -      -       -      -
    120A  GLU*     3.9    12.1    -      -       +      -
    121A  VAL*     3.7    14.3    -      -       +      +
    124A  MET*     3.6    20.6    -      -       +      -
    170A  LYS*     2.7    32.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  LEU      3.3    10.8    -      -       -      +
    107A  ILE      3.5     8.7    -      -       -      +
    108A  MET      3.3     4.5    -      -       -      -
    109A  HIS*     1.3    97.9    -      -       +      +
    111A  PHE*     1.3    70.6    +      -       +      +
    112A  LEU      3.3     3.9    +      -       -      +
    117A  GLN*     3.6    13.4    +      -       -      +
    170A  LYS*     5.5     1.6    -      -       -      +
    208A  PRO*     3.8    29.8    -      -       +      +
    212A  TYR*     5.4     1.1    -      -       +      -
    213A  VAL*     3.8    32.8    -      -       +      +
    217A  TYR*     5.1     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ILE      3.6    24.2    -      -       -      -
    108A  MET*     2.9    11.1    +      -       +      +
    110A  PRO*     1.3    86.3    -      -       +      +
    112A  LEU*     1.3    65.6    +      -       -      +
    113A  LYS*     4.6     6.2    +      -       -      +
    212A  TYR*     3.9    19.1    -      +       -      -
    213A  VAL*     3.8    18.8    -      -       +      -
    216A  VAL*     3.0    37.5    -      -       +      -
    217A  TYR*     3.7    37.9    +      +       +      +
    301A  IBG      4.1    32.3    -      +       +      -
----------------------------------------------------------
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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