Contacts of the helix formed by residues 92 - 121 (chain A) in PDB entry 2DPD


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 ASP 92 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  GLY      3.4    15.9    -      -       -      +
     69A  ILE*     3.0    11.1    +      -       -      +
     91A  LYS*     1.3    79.5    -      -       +      +
     93A  TYR*     1.3    57.5    +      -       -      +
     94A  GLU*     3.1    15.3    +      -       -      +
     95A  ALA*     3.1    34.0    +      -       +      +
     96A  ALA*     3.1    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  GLU*     3.1    28.8    +      -       +      +
     90A  PHE*     3.6    55.8    -      +       +      +
     91A  LYS      3.9     3.2    +      -       -      -
     92A  ASP*     1.3    71.4    +      -       -      +
     94A  GLU*     1.3    61.5    +      -       +      +
     96A  ALA*     3.6     7.2    -      -       +      -
     97A  LYS*     2.9    56.7    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     92A  ASP*     3.1    10.2    +      -       -      +
     93A  TYR*     1.3    75.6    -      -       +      +
     95A  ALA*     1.3    66.3    +      -       -      +
     97A  LYS*     3.1    21.2    +      -       -      +
     98A  LEU*     2.9    28.7    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     67A  ASP      5.3     2.0    -      -       -      +
     68A  GLY      4.8     1.3    -      -       -      +
     69A  ILE*     3.9    20.1    -      -       +      +
     92A  ASP*     3.1    39.4    +      -       +      +
     94A  GLU*     1.3    77.0    -      -       -      +
     96A  ALA*     1.3    60.7    -      -       -      +
     98A  LEU*     3.5    11.1    +      -       -      +
     99A  TYR*     3.1    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  ILE*     4.4    13.4    -      -       +      +
     69A  ILE*     3.7    19.4    -      -       +      +
     90A  PHE*     3.6    31.2    -      -       +      -
     92A  ASP      3.1     8.7    +      -       -      +
     93A  TYR*     3.4    12.6    -      -       +      +
     94A  GLU      3.1     0.4    -      -       -      -
     95A  ALA*     1.3    72.2    -      -       -      +
     97A  LYS*     1.3    57.7    +      -       -      +
     98A  LEU      3.0     0.5    +      -       -      -
     99A  TYR*     3.0     5.6    +      -       -      +
    100A  LYS*     2.8    35.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  GLU*     5.4     2.9    -      -       -      +
     93A  TYR*     2.9    55.2    +      -       +      +
     94A  GLU*     3.1    19.9    +      -       -      +
     96A  ALA*     1.3    74.4    -      -       -      +
     98A  LEU*     1.3    63.5    +      -       +      +
    100A  LYS*     3.4     8.2    +      -       -      +
    101A  LYS*     3.1    46.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  GLU*     2.9    18.5    +      -       +      +
     95A  ALA*     3.6    11.9    -      -       -      +
     97A  LYS*     1.3    77.4    -      -       +      +
     99A  TYR*     1.3    62.1    +      -       -      +
    101A  LYS*     3.1    22.8    +      -       +      +
    102A  GLN*     3.1    25.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  ARG*     5.5     0.2    -      -       -      -
     17A  ALA*     3.9    17.8    -      -       -      +
     20A  LYS*     3.2    50.4    +      -       +      -
     24A  ILE*     3.5    21.1    -      -       +      -
     64A  LEU*     4.4     6.5    -      -       +      -
     67A  ASP*     5.9     1.8    -      -       -      -
     69A  ILE*     5.2    10.1    -      -       +      -
     95A  ALA      3.1    13.1    +      -       -      +
     96A  ALA*     3.0     5.5    +      -       -      +
     98A  LEU*     1.3    75.4    -      -       -      +
    100A  LYS*     1.3    65.6    +      -       -      +
    102A  GLN*     3.4    26.7    +      -       +      +
    103A  LEU*     3.1    53.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  LEU*     3.8    16.2    -      -       +      -
     24A  ILE*     3.7    24.4    -      -       +      +
     25A  THR*     3.4    26.1    -      -       -      +
     28A  GLU*     3.5    25.9    +      -       -      +
     96A  ALA      2.8    18.1    +      -       -      +
     97A  LYS*     3.6    10.1    -      -       -      +
     99A  TYR*     1.3    72.8    -      -       -      +
    101A  LYS*     1.3    59.3    +      -       +      +
    103A  LEU*     3.3     3.9    +      -       -      +
    104A  LYS      3.0    21.8    +      -       -      -
    121B  ASN      2.8    28.8    +      -       -      -
    122B  PHE*     3.5    24.6    -      -       +      -
----------------------------------------------------------
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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  LYS*     3.1    32.1    +      -       -      +
     98A  LEU*     3.1    15.5    +      -       +      +
    100A  LYS*     1.3    76.1    -      -       +      +
    102A  GLN*     1.3    66.5    +      -       -      +
    104A  LYS*     3.1     9.5    +      -       -      +
    105A  VAL*     3.1    23.5    +      -       -      +
    122B  PHE*     5.4     0.4    -      -       -      -
----------------------------------------------------------
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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  LEU*     3.1    23.5    +      -       +      +
     99A  TYR*     3.6    32.5    +      -       +      +
    101A  LYS*     1.3    75.8    -      -       +      +
    103A  LEU*     1.3    57.9    +      -       +      +
    105A  VAL*     3.0    13.4    +      -       -      +
    106A  GLU*     2.9    32.2    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     13A  VAL*     4.7     3.4    -      -       +      -
     17A  ALA*     3.5    34.1    -      -       +      +
     21A  LEU*     3.7    43.3    -      -       +      +
     24A  ILE*     4.9     0.2    -      -       +      -
     99A  TYR*     3.1    59.7    +      -       +      +
    100A  LYS*     3.6     5.6    -      -       -      +
    101A  LYS      3.2     0.2    -      -       -      -
    102A  GLN*     1.3    72.0    -      -       -      +
    104A  LYS*     1.3    60.9    +      -       -      +
    106A  GLU*     3.5    17.3    -      -       +      +
    107A  LEU*     2.9    34.1    +      -       +      +
    122B  PHE*     4.2     2.5    -      -       -      -
----------------------------------------------------------
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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  LYS      3.0     7.6    +      -       -      +
    101A  LYS*     3.1    13.4    +      -       -      +
    103A  LEU*     1.3    75.5    -      -       -      +
    105A  VAL*     1.3    53.8    +      -       +      +
    107A  LEU*     3.2     3.5    +      -       -      +
    108A  ASP*     2.8    69.7    +      -       -      +
    118B  LEU*     3.7    17.9    -      -       +      +
    122B  PHE*     3.6    54.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  LYS      3.1    10.1    +      -       -      +
    102A  GLN*     3.0    13.1    +      -       -      +
    104A  LYS*     1.3    81.4    -      -       +      +
    106A  GLU*     1.3    64.6    +      -       +      +
    108A  ASP*     3.1    10.4    +      -       -      +
    109A  ARG*     3.0    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  PHE      5.2     1.6    -      -       -      +
     12A  LEU      5.6     0.3    -      -       -      -
     13A  VAL*     3.9    33.9    +      -       +      +
     14A  LYS*     5.0     2.8    +      -       -      +
     17A  ALA*     4.6     4.3    -      -       -      +
    102A  GLN*     2.9    18.4    +      -       +      +
    103A  LEU*     3.5    22.7    -      -       +      +
    105A  VAL*     1.3    78.4    -      -       +      +
    107A  LEU*     1.3    59.0    +      -       -      +
    109A  ARG*     3.3    22.0    +      -       -      +
    110A  SER*     2.9    31.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  VAL*     3.8    33.4    -      -       +      -
     18A  PHE*     4.6    12.6    -      -       +      -
     21A  LEU*     3.8    26.2    -      -       +      -
    103A  LEU*     2.9    20.5    +      -       +      +
    104A  LYS      3.7     0.7    -      -       -      +
    106A  GLU*     1.3    74.7    -      -       -      +
    108A  ASP*     1.3    59.5    +      -       -      +
    110A  SER*     3.1     3.6    +      -       -      -
    111A  LYS*     2.8    31.4    +      -       -      +
    114B  ILE*     3.8    14.8    -      -       +      +
    117B  ALA*     3.8    23.1    -      -       +      -
    118B  LEU*     3.5    33.9    -      -       +      +
    122B  PHE*     4.1     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104A  LYS*     2.8    51.8    +      -       -      +
    105A  VAL*     3.4    12.2    -      -       -      +
    106A  GLU      3.1     0.2    -      -       -      -
    107A  LEU*     1.3    77.2    -      -       -      +
    109A  ARG*     1.3    61.5    +      -       -      +
    111A  LYS*     3.5    11.5    +      -       -      +
    112A  LYS*     3.0    29.3    +      -       -      +
    118B  LEU*     3.8    12.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  GLY*     2.3    40.7    +      -       -      -
     11A  PHE      2.7    18.4    +      -       -      -
    105A  VAL*     3.0    22.9    +      -       +      +
    106A  GLU*     3.6    20.5    +      -       -      +
    108A  ASP*     1.3    71.5    -      -       -      +
    110A  SER*     1.3    59.8    -      -       -      +
    112A  LYS*     2.8    30.6    +      -       +      +
    113A  LEU*     2.8    20.2    +      -       -      +
     48B  ILE*     2.9    45.6    +      -       +      +
     49B  GLY*     3.4    16.4    +      -       -      -
     50B  PHE      3.7     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  PHE      4.8     1.1    +      -       -      -
     12A  LEU*     3.4    19.2    -      -       -      +
     13A  VAL*     3.0    37.1    +      -       -      +
    106A  GLU      2.9    12.9    +      -       -      -
    107A  LEU*     3.4    11.9    -      -       -      -
    109A  ARG*     1.3    76.6    -      -       -      +
    111A  LYS*     1.3    66.0    +      -       -      +
    113A  LEU*     3.4     2.1    +      -       -      -
    114A  ILE*     3.1    26.3    +      -       -      +
    114B  ILE*     3.8    19.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  LEU      2.8    12.8    +      -       -      +
    108A  ASP*     3.6    15.0    -      -       -      +
    110A  SER*     1.3    71.0    -      -       -      +
    112A  LYS*     1.3    64.1    +      -       -      +
    114A  ILE*     3.0     7.8    +      -       -      +
    115A  GLU*     2.8    53.1    +      -       +      +
    111B  LYS*     5.8     3.6    -      -       +      +
    114B  ILE*     3.6    23.5    -      -       +      +
    115B  GLU*     3.6    33.7    +      -       +      +
    118B  LEU*     5.1    13.5    -      -       +      -
----------------------------------------------------------
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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  ASP*     3.0    20.1    +      -       -      +
    109A  ARG*     2.8    19.5    +      -       +      +
    111A  LYS*     1.3    71.8    -      -       -      +
    113A  LEU*     1.3    50.7    +      -       -      +
    115A  GLU*     3.2     7.5    +      -       -      +
    116A  LYS*     2.7    37.6    +      -       -      +
     48B  ILE*     3.5    36.6    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     10A  GLY      4.1     8.3    -      -       -      +
     11A  PHE*     3.9    33.4    -      -       +      +
     12A  LEU*     3.9    19.7    -      -       +      -
    109A  ARG*     2.8    20.0    +      -       -      +
    110A  SER*     3.7     6.5    -      -       -      +
    112A  LYS*     1.3    71.0    -      -       -      +
    114A  ILE*     1.3    67.8    +      -       +      +
    116A  LYS*     2.9     6.4    +      -       -      +
    117A  ALA*     2.8    25.6    +      -       -      +
     18B  PHE*     4.1    11.7    -      -       +      -
     45B  PHE*     3.5    34.1    -      -       +      -
     48B  ILE*     3.7    19.0    -      -       +      +
     50B  PHE*     3.9    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  LEU*     3.2    44.2    -      -       +      -
    110A  SER      3.1     5.6    +      -       -      +
    111A  LYS*     3.0    10.8    +      -       -      +
    113A  LEU*     1.3    80.8    -      -       +      +
    115A  GLU*     1.3    60.8    +      -       -      +
    117A  ALA*     3.3     5.5    +      -       -      +
    118A  LEU*     2.8    35.9    +      -       +      +
     12B  LEU*     5.6     0.7    -      -       +      -
     13B  VAL*     4.6     7.9    -      -       +      -
     18B  PHE*     4.9     5.2    -      -       +      -
    107B  LEU*     3.7    19.1    -      -       +      +
    110B  SER*     4.0    20.9    -      -       -      +
    111B  LYS*     3.6    37.2    -      -       +      +
    114B  ILE*     5.3     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  LYS*     2.8    53.2    +      -       +      +
    112A  LYS*     3.8     5.9    -      -       -      +
    114A  ILE*     1.3    78.8    -      -       -      +
    116A  LYS*     1.3    56.4    +      -       -      +
    118A  LEU*     3.9     7.4    -      -       +      +
    119A  SER*     3.1    26.9    +      -       -      -
    111B  LYS*     3.4    40.2    +      -       +      -
    115B  GLU*     3.9     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  LYS      2.7    21.0    +      -       -      +
    113A  LEU      3.5     3.4    -      -       -      +
    115A  GLU*     1.3    72.7    -      -       -      +
    117A  ALA*     1.3    64.8    +      -       -      +
    119A  SER*     3.1     4.5    +      -       -      -
    120A  ASP*     2.8    51.9    +      -       -      +
     22B  TYR*     3.7     3.8    +      -       -      -
     44B  GLU*     2.6    58.0    +      -       -      +
     45B  PHE*     3.6    25.5    -      -       +      -
     48B  ILE*     4.4    16.8    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    113A  LEU      2.8     9.0    +      -       -      +
    114A  ILE*     3.5     4.0    -      -       -      +
    116A  LYS*     1.3    75.5    -      -       -      +
    118A  LEU*     1.3    62.4    +      -       -      +
    119A  SER      3.1     1.2    +      -       -      -
    121A  ASN*     3.1    31.8    +      -       -      +
     18B  PHE*     3.4    35.9    -      -       +      -
     21B  LEU*     5.1     2.2    -      -       +      -
     22B  TYR*     3.2    18.7    +      -       +      -
    107B  LEU*     3.6    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  ILE*     2.8    24.7    +      -       +      +
    115A  GLU*     3.9     9.2    -      -       +      +
    117A  ALA*     1.3    76.8    -      -       -      +
    119A  SER*     1.3    58.8    +      -       -      +
    122A  PHE*     3.5    38.4    +      -       +      +
    104B  LYS*     3.5    31.0    -      -       +      +
    107B  LEU*     3.5    33.8    -      -       +      +
    108B  ASP*     3.7    11.2    -      -       -      +
    111B  LYS*     5.3    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  GLU      3.1    17.6    +      -       -      -
    116A  LYS*     3.1     8.2    +      -       -      -
    117A  ALA      3.0     1.0    -      -       -      -
    118A  LEU*     1.3    77.4    -      -       -      +
    120A  ASP*     1.3    67.5    +      -       -      +
    122A  PHE*     3.1    18.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  LYS*     2.8    36.1    +      -       -      +
    119A  SER*     1.3    83.7    +      -       -      +
    121A  ASN*     1.3    73.2    +      -       -      +
    122A  PHE*     3.6     1.7    +      -       -      +
     22B  TYR*     2.6    27.6    +      -       +      -
     25B  THR*     4.6     7.0    -      -       -      +
     26B  MET*     6.1     2.5    -      -       +      -
     44B  GLU*     3.0     9.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ALA      3.1    16.2    +      -       -      +
    120A  ASP*     1.3    77.1    -      -       -      +
    122A  PHE*     1.3    62.8    +      -       +      +
     21B  LEU*     2.9    53.6    -      -       +      +
     22B  TYR*     3.3    33.7    -      -       -      +
     25B  THR*     2.4    33.6    +      -       -      +
    100B  LYS*     2.8    29.5    +      -       -      -
----------------------------------------------------------
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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