Contacts of the helix formed by residues 92 - 119 (chain A) in PDB entry 1RCE


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with GLY 92 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  PHE*     3.9    12.7    -      -       -      -
     47A  PHE*     3.6    27.7    -      -       -      -
     91A  ASN*     1.3    70.3    -      -       -      +
     93A  LEU*     1.3    61.7    +      -       -      +
     95A  ALA*     3.5     2.4    +      -       -      +
     96A  LEU*     3.0    24.1    +      -       -      +
    151A  LEU*     3.9     7.9    -      -       -      -
    163A  GLU*     2.9    21.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  ASN*     3.0     9.4    +      -       -      +
     92A  GLY*     1.3    74.2    -      -       -      +
     94A  GLU*     1.3    57.5    +      -       -      +
     96A  LEU*     3.2     5.2    +      -       +      +
     97A  GLN*     2.9    48.7    +      -       -      +
    148A  ILE*     4.1    26.2    -      -       +      -
    151A  LEU*     3.7    31.6    -      -       +      +
    152A  LYS*     4.1    19.5    -      -       +      -
    155A  TRP*     4.2    42.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  ARG*     3.1    36.5    +      -       -      +
     89A  TRP      3.8     6.7    -      -       -      +
     90A  ALA*     3.4    18.4    -      -       -      +
     91A  ASN*     3.0    24.7    +      -       -      +
     93A  LEU*     1.3    75.1    -      -       -      +
     95A  ALA*     1.3    63.6    +      -       -      +
     97A  GLN*     3.3    14.9    +      -       -      +
     98A  THR*     2.9    30.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  MET*     3.9    13.3    -      -       -      +
     37A  PHE*     3.6    29.4    -      -       +      -
     51A  PHE*     3.9    13.5    -      -       +      -
     89A  TRP*     4.0    11.6    +      -       +      -
     91A  ASN      2.9    18.0    +      -       -      +
     92A  GLY      3.8     2.9    -      -       -      +
     94A  GLU*     1.3    75.0    -      -       -      +
     96A  LEU*     1.3    64.4    +      -       -      +
     98A  THR*     3.2     8.5    +      -       -      -
     99A  ALA*     3.0    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  PHE*     4.4     7.9    -      -       +      -
     50A  PHE*     4.1    11.2    -      -       +      -
     51A  PHE*     3.8    22.0    -      -       +      -
     92A  GLY      3.0    13.5    +      -       -      +
     93A  LEU*     3.4     6.7    -      -       +      +
     95A  ALA*     1.3    77.3    -      -       -      +
     97A  GLN*     1.3    60.7    +      -       -      +
     99A  ALA*     3.4     4.9    +      -       -      +
    100A  LEU      3.2    16.3    +      -       -      -
    144A  LEU*     4.1    22.7    -      -       +      +
    147A  HIS*     4.1    29.4    -      -       +      -
    148A  ILE*     3.9    23.4    -      -       +      +
    151A  LEU*     3.8    27.4    -      -       +      -
    166A  PHE*     4.2    11.0    -      -       +      -
    171A  LEU*     5.8     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93A  LEU*     2.9    33.8    +      -       -      +
     94A  GLU*     3.8    15.5    -      -       -      +
     96A  LEU*     1.3    72.9    -      -       -      +
     98A  THR*     1.3    65.7    +      -       -      +
    100A  LEU*     3.3    11.8    +      -       +      +
    101A  LYS*     3.3    18.2    +      -       -      +
    148A  ILE*     4.0    25.8    -      -       +      -
    152A  LYS*     3.7    25.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  VAL*     5.4     2.9    -      -       +      -
     33A  MET*     3.7    21.3    -      -       +      -
     85A  GLU*     6.1     0.9    -      -       -      +
     86A  ARG*     4.2    14.6    +      -       -      -
     89A  TRP*     3.9    14.3    -      -       +      -
     94A  GLU*     2.9    16.5    +      -       -      +
     95A  ALA*     3.2     9.0    +      -       -      -
     97A  GLN*     1.3    76.8    -      -       -      +
     99A  ALA*     1.3    58.4    +      -       -      +
    101A  LYS*     3.1    20.1    +      -       -      +
    102A  LEU*     2.9    28.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  TYR*     3.7    29.6    -      -       +      +
     33A  MET*     4.4     2.6    -      -       +      +
     51A  PHE*     4.2    11.9    -      -       +      -
     95A  ALA      3.0    12.4    +      -       -      +
     96A  LEU      3.6     9.4    -      -       -      +
     97A  GLN      3.2     0.2    -      -       -      -
     98A  THR*     1.3    78.4    -      -       -      +
    100A  LEU*     1.3    56.3    +      -       -      +
    102A  LEU*     3.4     8.1    -      -       -      +
    103A  GLN*     2.8    34.1    +      -       -      +
    144A  LEU*     3.9    13.7    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     96A  LEU      3.2     6.6    +      -       -      +
     97A  GLN*     3.6     9.4    -      -       -      +
     98A  THR      3.2     0.4    -      -       -      -
     99A  ALA*     1.3    75.9    -      -       -      +
    101A  LYS*     1.3    63.2    +      -       +      +
    103A  GLN*     3.4     1.0    +      -       -      +
    104A  LYS*     3.0    45.2    +      -       +      +
    141A  ILE*     3.7    42.0    -      -       +      +
    144A  LEU*     4.0    15.9    -      -       +      +
    145A  GLY*     4.3     8.3    -      -       -      +
    148A  ILE*     3.7    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  GLN      3.3    12.8    +      -       -      +
     98A  THR*     3.1    19.0    +      -       -      +
    100A  LEU*     1.3    74.7    -      -       +      +
    102A  LEU*     1.3    67.8    +      -       -      +
    104A  LYS*     3.1     9.7    +      -       -      +
    105A  SER*     3.0    24.8    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     22A  LEU*     6.5     1.1    -      -       +      -
     25A  HIS*     5.2     7.4    -      -       +      -
     26A  SER*     3.9    27.6    -      -       -      -
     29A  VAL*     4.0    31.2    -      -       +      -
     30A  TYR*     3.7    35.2    -      -       +      +
     33A  MET*     5.6     0.9    -      -       +      -
     98A  THR*     2.9    16.1    +      -       +      +
     99A  ALA*     3.4     8.7    -      -       -      +
    101A  LYS*     1.3    76.4    -      -       -      +
    103A  GLN*     1.3    65.4    +      -       -      +
    105A  SER*     2.9    22.8    +      -       -      +
    106A  VAL*     3.0    21.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  LYS*     5.4     3.5    +      -       -      +
     26A  SER*     5.6     1.4    +      -       -      -
     30A  TYR*     2.8    36.1    +      -       -      +
     54A  ARG*     5.1     1.2    -      -       -      +
     58A  ALA*     6.0     1.0    -      -       -      +
     99A  ALA      2.8    18.3    +      -       -      +
    100A  LEU      3.8     3.6    -      -       -      +
    102A  LEU*     1.3    74.1    -      -       -      +
    104A  LYS*     1.3    57.9    +      -       -      +
    106A  VAL*     3.5    12.8    +      -       -      +
    107A  ASN*     2.9    29.1    +      -       -      +
    136A  GLU*     3.8    18.8    +      -       -      +
    137A  SER*     4.8    10.3    +      -       -      +
    140A  THR*     4.1    18.6    -      -       +      +
    141A  ILE*     4.0    16.7    -      -       +      +
    144A  LEU*     3.7    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100A  LEU*     3.0    40.6    +      -       +      +
    101A  LYS*     3.1     7.4    +      -       -      +
    103A  GLN*     1.3    74.5    -      -       -      +
    105A  SER*     1.3    60.7    +      -       -      +
    107A  ASN*     3.3     9.0    +      -       -      +
    108A  GLN*     2.9    28.5    +      -       -      +
    141A  ILE*     3.9    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  LEU*     4.7     3.8    -      -       -      +
    101A  LYS      3.0    11.8    +      -       -      -
    102A  LEU*     2.9    22.3    +      -       -      +
    104A  LYS*     1.3    74.1    -      -       -      +
    106A  VAL*     1.3    63.7    +      -       -      +
    108A  GLN*     3.4     8.2    +      -       -      +
    109A  ALA*     3.1    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  THR*     5.9     1.1    -      -       +      -
     22A  LEU*     4.2    28.9    -      -       +      +
     23A  LYS*     3.8    35.7    -      -       +      +
     26A  SER*     4.4    22.2    -      -       -      +
    102A  LEU*     3.0    28.4    +      -       +      +
    103A  GLN*     3.8    14.1    -      -       -      +
    105A  SER*     1.3    74.2    -      -       -      +
    107A  ASN*     1.3    67.2    +      -       -      +
    109A  ALA*     3.3     2.8    +      -       -      +
    110A  LEU*     3.1    29.5    +      -       +      +
    137A  SER*     5.5     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  GLN      2.9    18.6    +      -       -      +
    104A  LYS*     3.5     6.3    +      -       -      +
    105A  SER      3.3     0.2    -      -       -      -
    106A  VAL*     1.3    78.6    -      -       -      +
    108A  GLN*     1.3    60.9    +      -       -      +
    110A  LEU*     3.4     4.8    +      -       -      +
    111A  LEU*     3.1    39.2    +      -       -      +
    134A  LEU*     4.3    14.2    -      -       -      +
    137A  SER*     3.1    34.2    +      -       -      -
    138A  VAL*     4.8     8.2    -      -       -      +
    141A  ILE*     4.0    17.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  LYS      2.9    16.5    +      -       -      +
    105A  SER*     3.6    10.3    -      -       -      +
    106A  VAL      3.2     0.2    -      -       -      -
    107A  ASN*     1.3    77.7    -      -       -      +
    109A  ALA*     1.3    61.3    +      -       -      +
    111A  LEU*     3.2    21.3    +      -       -      +
    112A  ASP*     3.0    43.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  THR*     5.0     9.4    +      -       +      +
     22A  LEU*     3.4    33.0    -      -       +      -
    105A  SER      3.1    10.9    +      -       -      +
    106A  VAL      3.3     4.4    +      -       -      +
    108A  GLN*     1.3    77.4    -      -       -      +
    110A  LEU*     1.3    56.6    +      -       -      +
    112A  ASP*     3.1    11.1    +      -       -      +
    113A  LEU*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     19A  THR*     3.9    26.0    -      -       +      -
     23A  LYS*     4.8    13.5    -      -       -      +
     65A  LEU*     5.6     3.4    -      -       +      -
    106A  VAL*     3.1    27.1    +      -       +      +
    107A  ASN*     3.7     5.4    -      -       -      +
    108A  GLN      3.3     0.2    -      -       -      -
    109A  ALA*     1.3    72.9    -      -       -      +
    111A  LEU*     1.3    59.6    +      -       -      +
    113A  LEU*     3.3     7.9    +      -       +      +
    114A  HIS*     2.8    28.9    +      -       -      +
    129A  LEU*     4.6    17.6    -      -       +      +
    133A  TYR*     4.1    31.6    -      -       +      +
    134A  LEU*     3.6    19.9    -      -       +      +
    136A  GLU*     5.0     0.4    -      -       -      +
    137A  SER*     3.5    25.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ASN*     3.1    34.9    +      -       -      +
    108A  GLN*     3.2    29.4    +      -       -      +
    110A  LEU*     1.3    75.8    -      -       -      +
    112A  ASP*     1.3    57.8    +      -       -      +
    114A  HIS*     3.2     8.3    +      -       +      +
    115A  ALA*     2.9    28.3    +      -       -      +
    134A  LEU*     4.2    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  GLN*     3.0    39.8    +      -       -      +
    109A  ALA*     3.3    11.7    -      -       -      +
    111A  LEU*     1.3    74.4    -      -       -      +
    113A  LEU*     1.3    64.9    +      -       -      +
    115A  ALA*     3.2     8.5    +      -       -      +
    116A  VAL*     3.1    26.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     11A  ASP      4.8     1.3    -      -       -      +
     12A  CYS*     4.3     7.6    -      -       -      +
     15A  GLY*     3.6    32.1    -      -       -      +
     16A  LEU*     4.1    14.6    -      -       +      -
     18A  ARG*     5.7     0.2    -      -       -      +
     19A  THR*     3.5    28.0    -      -       +      +
     65A  LEU*     5.8     0.4    -      -       +      -
    109A  ALA      2.9    16.1    +      -       -      +
    110A  LEU*     3.7     8.1    -      -       +      +
    112A  ASP*     1.3    74.1    -      -       -      +
    114A  HIS*     1.3    63.9    +      -       -      +
    116A  VAL*     3.1    12.3    +      -       +      +
    117A  ALA*     3.0    21.0    +      -       -      +
    125A  MET*     3.7    28.7    -      -       +      +
    129A  LEU*     3.9    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  LEU      2.8    14.1    +      -       -      +
    111A  LEU*     3.3    15.5    -      -       +      +
    112A  ASP      3.2     0.2    -      -       -      -
    113A  LEU*     1.3    77.6    -      -       -      +
    115A  ALA*     1.3    58.1    +      -       -      +
    117A  ALA*     3.2     4.9    +      -       -      +
    118A  ALA*     2.9    32.7    +      -       +      +
    126A  THR*     3.3    41.3    +      -       +      +
    129A  LEU*     3.9    20.1    -      -       +      +
    130A  GLU*     2.8    35.7    +      -       +      -
    134A  LEU*     4.1    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  LEU      2.9    13.6    +      -       -      +
    112A  ASP*     3.2    13.4    +      -       -      +
    114A  HIS*     1.3    78.7    +      -       -      +
    116A  VAL*     1.3    57.8    +      -       +      +
    118A  ALA*     3.7     6.1    -      -       -      +
    119A  ASP*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  ASP*     3.9    29.2    -      -       +      +
     12A  CYS*     3.7    19.7    -      -       -      -
     18A  ARG*     6.1     2.5    -      -       -      +
    112A  ASP      3.1    14.2    +      -       -      +
    113A  LEU*     3.1    14.1    +      -       +      +
    115A  ALA*     1.3    77.0    -      -       +      +
    117A  ALA*     1.3    59.0    +      -       -      +
    119A  ASP*     3.2     8.9    +      -       -      +
    120A  LYS*     2.8    43.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  CYS*     3.8    12.3    -      -       -      -
    113A  LEU      3.0    13.0    +      -       -      +
    114A  HIS*     3.2    10.1    +      -       -      +
    116A  VAL*     1.3    75.6    -      -       -      +
    118A  ALA*     1.3    60.2    +      -       -      +
    120A  LYS      3.3     1.9    +      -       -      -
    121A  SER      3.1     4.7    +      -       -      -
    122A  ASP*     2.9    28.4    +      -       +      +
    125A  MET*     4.0    33.4    -      -       +      -
    126A  THR*     3.7    17.3    -      -       +      +
    129A  LEU*     4.8     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  HIS*     2.9    23.5    +      -       +      +
    115A  ALA*     3.7     7.6    -      -       -      +
    117A  ALA*     1.3    75.4    -      -       -      +
    119A  ASP*     1.3    57.8    +      -       -      +
    121A  SER*     2.9    21.9    +      -       -      +
    122A  ASP      4.8     1.1    -      -       -      +
    126A  THR*     3.7    13.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  ALA      2.9    19.0    +      -       -      +
    116A  VAL*     3.5     7.6    -      -       -      +
    118A  ALA*     1.3    77.1    -      -       -      +
    120A  LYS*     1.3    82.5    +      -       -      +
    121A  SER*     3.2     3.4    +      -       -      -
----------------------------------------------------------
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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