Contacts of the helix formed by residues 90 - 115 (chain A) in PDB entry 3GTU


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 GLU 90 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88A  GLU      3.8     0.6    +      -       -      -
     89A  SER*     1.3    71.7    -      -       -      +
     91A  LYS*     1.3    81.5    +      -       +      +
     93A  GLN*     3.2    17.0    +      -       -      +
     94A  ILE*     2.9    43.4    +      -       +      +
     70B  LYS*     5.3     1.4    -      -       -      -
     71B  ASN*     3.6    11.3    -      -       -      +
     82B  TYR*     3.5    14.4    -      -       -      -
     85B  ARG*     3.9    16.6    +      -       -      +
     86B  LYS*     2.9    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 91 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89A  SER*     2.9    11.6    +      -       -      +
     90A  GLU*     1.3   104.5    +      -       +      +
     92A  GLU*     1.3    65.7    +      -       +      +
     94A  ILE*     3.2    10.2    +      -       -      +
     95A  ARG*     3.1    27.5    +      -       -      +
     70B  LYS*     4.3    22.3    -      -       -      +
     71B  ASN*     4.6    16.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 92 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  GLY*     3.8    11.0    -      -       -      -
     88A  GLU*     3.0    16.1    +      -       -      +
     89A  SER*     2.8    37.4    +      -       -      +
     91A  LYS*     1.3    77.4    -      -       +      +
     93A  GLN*     1.3    56.7    -      -       -      +
     95A  ARG*     3.2     5.6    +      -       -      +
     96A  GLU*     2.8    26.0    +      -       -      +
    148A  LEU*     3.0    35.7    -      -       +      +
    151A  LYS*     3.2    37.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  GLY*     3.6    20.6    +      -       -      +
     88A  GLU      3.4    18.1    +      -       -      +
     89A  SER      2.9     9.7    +      -       -      +
     90A  GLU*     3.2    25.2    +      -       -      +
     92A  GLU*     1.3    73.2    -      -       -      +
     94A  ILE*     1.3    58.4    +      -       -      +
     96A  GLU*     3.3    14.1    +      -       -      +
     97A  ASP*     2.9    34.8    +      -       -      +
     85B  ARG*     3.3    41.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  GLU*     2.9    26.7    +      -       +      +
     91A  LYS*     3.6     7.6    -      -       -      +
     93A  GLN*     1.3    75.8    -      -       -      +
     95A  ARG*     1.3    63.1    +      -       +      +
     97A  ASP*     3.3     5.1    +      -       -      +
     98A  ILE*     3.0    51.7    +      -       +      +
     71B  ASN*     3.8    29.2    -      -       +      +
     72B  LYS      5.1     2.2    -      -       -      +
     73B  ILE*     3.7    18.2    -      -       +      -
     78B  ALA*     6.0     1.3    -      -       +      +
     82B  TYR*     3.6    38.6    -      -       +      -
     85B  ARG*     4.2     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  LYS*     3.1    17.2    +      -       -      +
     92A  GLU*     3.4    10.5    -      -       -      +
     94A  ILE*     1.3    76.2    -      -       +      +
     96A  GLU*     1.3    57.9    +      -       -      +
     98A  ILE*     3.9     3.3    -      -       -      +
     99A  LEU*     2.9    38.2    +      -       -      +
    140A  PHE*     3.1    66.0    +      -       +      +
    144A  GLN*     3.3    23.5    +      -       -      +
    147A  PHE*     2.7    33.7    +      -       -      +
    148A  LEU*     4.0    17.3    -      -       +      +
     59B  ASP*     5.7     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  ARG*     4.0    12.4    +      -       -      +
     86A  CYS*     3.5     7.9    -      -       -      +
     87A  GLY*     2.9    31.6    +      -       -      +
     92A  GLU      2.8    17.3    +      -       -      +
     93A  GLN*     3.3    13.5    -      -       -      +
     95A  ARG*     1.3    76.1    -      -       -      +
     97A  ASP*     1.3    62.1    +      -       -      +
     99A  LEU*     4.1     0.7    -      -       -      +
    100A  GLU*     3.0    31.0    +      -       -      +
    148A  LEU*     4.0     5.7    -      -       +      +
    153A  THR*     4.6     3.5    -      -       -      +
    154A  PHE*     3.1    33.5    -      -       +      -
    155A  VAL*     3.7    26.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  ARG*     3.0    26.7    +      -       -      +
     93A  GLN*     2.9    17.7    +      -       -      +
     94A  ILE*     3.7     4.0    -      -       -      +
     96A  GLU*     1.3    76.6    -      -       -      +
     98A  ILE*     1.3    65.9    +      -       -      +
    100A  GLU*     3.4     1.8    +      -       -      +
    101A  ASN*     2.8    32.7    +      -       -      +
     78B  ALA*     3.6    21.1    -      -       +      +
     81B  ARG*     3.4    26.6    +      -       -      +
     85B  ARG*     2.6    30.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  ILE*     3.0    35.7    +      -       +      +
     95A  ARG*     4.0     5.4    -      -       -      +
     97A  ASP*     1.3    76.7    -      -       -      +
     99A  LEU*     1.3    52.6    +      -       +      +
    101A  ASN*     3.8     1.7    -      -       -      +
    102A  GLN*     2.8    38.5    +      -       +      +
    140A  PHE*     5.8     6.3    -      -       +      -
     59B  ASP*     5.9     4.5    -      -       +      +
     60B  PHE*     4.1    24.9    -      -       +      -
     72B  LYS      4.3     5.4    -      -       -      +
     73B  ILE*     3.9    15.5    -      -       +      -
     74B  THR*     3.6    39.5    -      -       -      +
     75B  GLN*     3.9     8.5    -      -       +      +
     78B  ALA*     3.8    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  ARG      2.9    20.0    +      -       -      +
     98A  ILE*     1.3    75.9    -      -       +      +
    100A  GLU*     1.3    57.4    +      -       -      +
    102A  GLN*     4.1     2.5    -      -       +      -
    103A  PHE*     2.7    64.1    +      -       +      -
    137A  TYR*     4.6     3.8    -      -       +      -
    140A  PHE*     3.4    38.6    -      -       +      -
    147A  PHE*     3.8    29.6    -      -       +      +
    148A  LEU*     4.3     7.6    -      -       +      -
    155A  VAL*     3.6    22.9    -      -       +      -
     60B  PHE*     4.2    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  ASN*     3.5    37.9    +      -       -      +
     77A  ARG*     2.8    47.3    +      -       -      -
     96A  GLU      3.0    20.5    +      -       -      +
     97A  ASP      3.4     2.8    +      -       -      +
     99A  LEU*     1.3    74.7    -      -       -      +
    101A  ASN*     1.3    71.4    +      -       -      +
    103A  PHE*     4.0     2.4    -      -       -      +
    104A  MET*     3.2    22.0    +      -       -      +
    154A  PHE*     3.6    14.3    -      -       +      -
    155A  VAL*     4.5     2.4    -      -       +      +
    158A  ILE*     4.4    20.6    -      -       +      +
     81B  ARG*     4.7     1.4    +      -       -      -
    104B  GLU*     4.3     9.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  ASN*     6.0     0.9    -      -       -      +
     97A  ASP*     2.8    30.0    +      -       -      +
    100A  GLU*     1.3    85.4    +      -       -      +
    102A  GLN*     1.3    65.7    +      -       -      +
    104A  MET*     3.0    10.2    +      -       -      +
    105A  ASP*     2.9    22.0    +      -       -      +
     75B  GLN*     3.4    29.5    -      -       +      +
     77B  ASN*     3.3    44.0    +      -       -      +
     78B  ALA*     4.1     5.5    -      -       -      +
     81B  ARG*     5.8     1.0    -      -       -      +
    104B  GLU*     5.9     0.6    +      -       -      -
    108B  MET*     4.5     5.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 102 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  ILE*     2.8    26.8    +      -       +      +
     99A  LEU*     3.6     6.7    -      -       +      +
    101A  ASN*     1.3    71.9    -      -       -      +
    103A  PHE*     1.3    57.0    +      -       -      +
    105A  ASP*     3.0    27.3    -      -       -      +
    106A  SER*     3.3     4.2    +      -       -      -
    133A  MET*     6.1     2.0    -      -       -      +
    136A  LEU*     5.7     2.4    -      -       -      +
    137A  TYR*     3.1    40.1    +      -       +      +
     60B  PHE*     3.8    38.4    -      -       +      +
     62B  ASN*     4.6     5.2    +      -       -      +
     74B  THR*     5.4     0.3    +      -       -      -
     75B  GLN*     2.9    32.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  LEU*     2.7    54.1    +      -       +      +
    100A  GLU      4.0     0.9    -      -       -      +
    102A  GLN*     1.3    69.1    -      -       -      +
    104A  MET*     1.3    65.3    +      -       -      +
    105A  ASP      3.2     1.8    -      -       -      -
    106A  SER*     3.4     3.6    +      -       -      -
    107A  ARG*     3.0    23.3    +      -       -      +
    137A  TYR*     3.5    46.0    -      +       -      -
    147A  PHE*     4.1    13.2    -      +       -      -
    155A  VAL*     4.2    12.3    -      -       +      -
    158A  ILE*     3.7    24.7    -      -       +      -
    159A  ALA*     3.7    30.3    -      -       +      -
    162A  VAL*     3.5    32.0    -      -       +      +
    163A  LEU*     4.9     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  LEU*     5.0     3.8    -      -       +      -
     72A  SER*     4.9    11.7    -      -       -      -
     73A  ASN*     3.6    31.6    -      -       -      +
    100A  GLU      3.2    13.8    +      -       -      +
    101A  ASN*     3.0    12.0    +      -       -      +
    103A  PHE*     1.3    73.6    -      -       -      +
    105A  ASP*     1.3    65.7    +      -       -      +
    107A  ARG*     3.3    27.7    +      -       -      +
    108A  MET*     3.0    61.5    +      -       +      +
    158A  ILE*     5.2     0.4    -      -       -      +
    108B  MET*     6.4     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  ASN      2.9     9.1    +      -       -      +
    102A  GLN*     3.0    23.1    -      -       -      +
    104A  MET*     1.3    78.4    -      -       -      +
    106A  SER*     1.3    62.4    +      -       -      +
    108A  MET*     3.3     5.4    +      -       -      +
    109A  GLN*     3.0    29.1    +      -       -      +
     62B  ASN*     5.0     2.8    +      -       -      -
     75B  GLN*     3.5    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  GLN*     3.3     4.0    +      -       -      -
    103A  PHE*     3.7     8.3    -      -       -      -
    104A  MET      3.3     0.4    -      -       -      -
    105A  ASP*     1.3    77.5    -      -       -      +
    107A  ARG*     1.3    64.4    +      -       -      +
    109A  GLN*     3.2    11.6    +      -       -      +
    110A  LEU*     3.1    22.5    +      -       -      +
    126A  TYR*     4.8     3.6    +      -       -      -
    133A  MET*     3.4    35.4    -      -       -      +
    137A  TYR*     2.7    28.8    +      -       -      -
    162A  VAL*     5.1    10.3    -      -       -      -
    166A  ASN*     5.5     1.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  LEU*     3.6    32.1    -      -       -      +
     15A  SER*     3.8    10.7    +      -       -      -
     72A  SER*     5.7     2.8    -      -       -      -
     73A  ASN*     5.2     2.4    +      -       -      -
     76A  LEU*     6.3     0.4    -      -       -      +
    103A  PHE      3.0    14.2    +      -       -      +
    104A  MET*     3.5    36.5    -      -       -      +
    106A  SER*     1.3    76.9    -      -       -      +
    108A  MET*     1.3    70.5    +      -       +      +
    110A  LEU*     3.3     7.1    +      -       -      +
    111A  ALA*     2.9    30.7    +      -       +      +
    158A  ILE*     3.7    30.9    +      -       -      +
    161A  ASP*     3.0    28.2    +      -       -      -
    162A  VAL*     3.8    20.4    -      -       +      +
    165A  ARG*     4.3    22.2    +      -       -      +
    208A  PHE*     6.2     0.2    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     12A  LEU*     4.5    10.8    -      -       +      -
    104A  MET*     3.0    49.1    +      -       +      +
    105A  ASP*     3.7     5.6    -      -       -      +
    107A  ARG*     1.3   100.9    -      -       +      +
    109A  GLN*     1.3    65.6    +      -       -      +
    111A  ALA*     3.7    11.6    -      -       +      +
    112A  LYS*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  ASP*     3.0    20.2    +      -       -      +
    106A  SER*     3.2    12.9    +      -       -      +
    108A  MET*     1.3    78.7    -      -       -      +
    110A  LEU*     1.3    61.7    +      -       -      +
    112A  LYS*     4.2    10.6    -      -       -      +
    113A  LEU*     3.5    19.4    +      -       -      +
    126A  TYR*     3.4    30.7    -      -       +      -
    129A  ALA*     5.4     7.4    -      -       -      +
    130A  LEU*     5.9     1.0    +      -       -      -
    133A  MET*     4.3    19.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  SER      3.1     8.1    +      -       -      +
    107A  ARG*     3.9     7.2    -      -       -      +
    109A  GLN*     1.3    76.0    -      -       -      +
    111A  ALA*     1.3    67.8    +      -       -      +
    113A  LEU*     3.2     8.9    +      -       +      +
    114A  CYS*     2.9    46.5    +      -       -      -
    126A  TYR*     3.8    35.6    -      -       +      +
    162A  VAL      5.5     0.4    -      -       -      +
    165A  ARG*     3.7    40.4    -      -       +      +
    166A  ASN*     4.1    16.4    -      -       -      +
    169A  PHE*     4.2    19.5    -      -       +      -
    208A  PHE*     4.4     5.8    -      -       +      -
    214A  TRP*     5.2     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ARG*     2.9    19.5    +      -       +      +
    108A  MET*     3.7    19.1    -      -       +      +
    109A  GLN      3.4     0.2    -      -       -      -
    110A  LEU*     1.3    75.1    -      -       -      +
    112A  LYS*     1.3    64.0    +      -       -      +
    114A  CYS*     3.0    12.1    +      -       -      -
    115A  TYR*     3.0    27.2    -      -       +      -
    208A  PHE*     3.8    25.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  MET      3.0    15.5    +      -       -      +
    109A  GLN*     4.2     9.9    -      -       -      +
    111A  ALA*     1.3    77.0    -      -       -      +
    113A  LEU*     1.3    57.5    +      -       -      +
    115A  TYR*     3.2     5.9    +      -       -      +
    116A  ASP*     2.9    40.7    +      -       +      +
    116B  ARG*     4.8    18.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 113 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  GLN      3.5    12.0    +      -       -      +
    110A  LEU*     3.2    14.1    +      -       +      +
    111A  ALA      3.2     0.6    -      -       -      -
    112A  LYS*     1.3    79.5    -      -       -      +
    114A  CYS*     1.3    69.6    +      -       -      +
    115A  TYR      3.2     1.2    +      -       -      -
    116A  ASP*     3.2    18.8    +      -       -      +
    119A  PHE*     3.5    35.1    -      -       +      +
    122A  LEU*     3.5    46.7    -      -       +      +
    123A  LYS*     3.8     4.3    -      -       -      +
    126A  TYR*     4.2    19.7    -      -       +      -
    169A  PHE*     3.8    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  LEU*     2.9    35.8    +      -       -      +
    111A  ALA      3.6     2.0    -      -       -      +
    113A  LEU*     1.3    83.8    -      -       -      +
    115A  TYR*     1.3    60.6    +      -       -      +
    119A  PHE*     4.0     8.1    -      -       -      -
    169A  PHE*     4.2     0.7    -      -       -      -
    208A  PHE*     3.4    38.8    -      -       +      -
    212A  ALA      3.7     0.5    -      -       -      -
    213A  VAL*     2.7    28.5    +      -       -      +
    214A  TRP*     3.1    33.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  ALA*     3.0    33.4    +      -       +      +
    112A  LYS*     3.9     5.6    -      -       -      +
    114A  CYS*     1.3    79.0    -      -       -      +
    116A  ASP*     1.3    64.8    +      -       -      +
    117A  PRO*     3.4     7.8    -      -       -      +
    208A  PHE*     3.3    35.0    -      +       +      +
    209A  THR*     2.9    45.9    +      -       -      +
    211A  MET*     3.9    17.0    -      -       +      +
    212A  ALA*     3.5    21.5    -      -       +      -
    213A  VAL*     3.6    10.4    -      -       -      +
----------------------------------------------------------
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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