Contacts of the helix formed by residues 59 - 86 (chain A) in PDB entry 1TAG


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with LEU 59 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  SER*     1.3    73.3    -      -       -      +
     60A  GLU*     1.3    62.9    +      -       +      +
     62A  CYS*     3.1     6.7    +      -       -      +
     63A  LEU*     2.9    44.5    +      -       +      +
    164A  VAL*     3.8    34.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  SER*     3.3     7.4    +      -       -      +
     59A  LEU*     1.3    81.7    -      -       +      +
     61A  GLU*     1.3    63.4    +      -       +      +
     63A  LEU*     3.3    16.7    +      -       +      +
     64A  GLU*     3.1    22.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  LYS*     3.1    29.8    +      -       -      -
     56A  GLY      3.6     1.2    -      -       -      +
     57A  TYR*     3.2    19.0    -      -       +      -
     58A  SER*     2.9    42.9    +      -       -      +
     60A  GLU*     1.3    78.5    -      -       +      +
     62A  CYS*     1.3    60.8    +      -       -      +
     64A  GLU*     2.4    40.4    -      -       -      +
     65A  PHE*     3.1    14.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 62 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  TYR*     3.6    24.7    -      -       -      -
     58A  SER      2.9    17.8    +      -       -      -
     59A  LEU*     3.1     8.7    +      -       -      +
     61A  GLU*     1.3    76.1    -      -       -      +
     63A  LEU*     1.3    64.0    +      -       -      +
     65A  PHE*     3.1    17.3    +      -       -      +
    164A  VAL*     3.7    13.9    -      -       +      -
    165A  PRO*     3.2    49.4    -      -       +      +
    166A  THR      5.2     3.1    -      -       -      -
    167A  GLU*     5.3     4.3    -      -       -      -
    170A  VAL*     4.6     7.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 63 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  LEU*     2.9    36.8    +      -       +      +
     60A  GLU*     3.7    18.6    -      -       +      +
     61A  GLU      3.3     0.4    -      -       -      -
     62A  CYS*     1.3    76.4    -      -       -      +
     64A  GLU*     1.3    60.4    +      -       -      +
     66A  ILE*     3.3    41.3    +      -       +      +
     67A  ALA      4.8     0.7    +      -       -      -
    163A  TYR      4.6     1.1    -      -       -      +
    164A  VAL*     4.1    23.1    -      -       +      -
    165A  PRO*     4.6     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 64 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  TYR*     5.3     0.5    -      -       -      -
     60A  GLU      3.1     8.9    +      -       -      +
     61A  GLU*     2.4    53.1    -      -       -      +
     63A  LEU*     1.3    75.4    -      -       -      +
     65A  PHE*     1.3    77.4    +      -       +      +
     66A  ILE      3.3     0.7    +      -       -      -
     67A  ALA*     4.1     9.7    +      -       -      +
     68A  ILE*     3.9    15.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 65 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  LYS*     5.1     6.1    -      -       +      -
     57A  TYR*     3.7    25.1    -      +       -      -
     61A  GLU      3.1    26.2    -      -       -      -
     62A  CYS      3.1     9.0    +      -       -      +
     64A  GLU*     1.3    96.3    -      -       +      +
     66A  ILE*     1.3    64.4    +      -       -      +
     67A  ALA      3.4     0.4    -      -       -      -
     68A  ILE*     3.3    23.7    +      -       +      +
     69A  ILE*     2.9    40.3    +      -       +      +
    165A  PRO*     4.3     0.9    -      -       +      -
    170A  VAL*     3.7    33.2    -      -       +      -
    173A  SER*     3.5    28.5    -      -       -      -
    175A  VAL*     5.3     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 66 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  CYS      3.8     0.2    +      -       -      -
     63A  LEU*     3.3    34.8    +      -       +      +
     65A  PHE*     1.3    77.3    -      -       -      +
     67A  ALA*     1.3    63.7    +      -       -      +
     69A  ILE*     3.2     4.3    +      -       -      +
     70A  TYR*     2.9    59.4    +      -       +      +
    163A  TYR*     3.4    29.8    -      -       +      +
    165A  PRO*     3.6    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 67 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  LEU      4.8     0.6    +      -       -      -
     64A  GLU      4.1     7.9    +      -       -      +
     65A  PHE      3.4     0.4    -      -       -      -
     66A  ILE*     1.3    79.0    -      -       -      +
     68A  ILE*     1.3    58.4    +      -       +      +
     70A  TYR      3.4     0.5    +      -       -      -
     71A  GLY*     3.0    25.3    +      -       -      -
    112A  GLU      5.4     1.1    -      -       -      +
    113A  GLY*     3.4    35.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 68 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  GLU*     3.9    16.8    -      -       +      +
     65A  PHE*     3.7    32.1    -      -       +      +
     66A  ILE      3.3     0.4    -      -       -      -
     67A  ALA*     1.3    78.3    -      -       +      +
     69A  ILE*     1.3    58.7    +      -       -      +
     71A  GLY*     3.3     2.1    +      -       -      -
     72A  ASN*     2.9    41.3    +      -       -      +
    173A  SER*     4.0    14.6    -      -       -      +
    174A  ARG      3.5    26.5    -      -       -      +
    175A  VAL*     4.1    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  PHE*     2.9    26.4    +      -       +      +
     66A  ILE*     3.7     4.5    -      -       -      +
     68A  ILE*     1.3    77.1    -      -       -      +
     70A  TYR*     1.3    64.1    +      -       +      +
     72A  ASN*     3.3     7.7    +      -       -      +
     73A  THR*     2.8    38.2    +      -       -      +
    151A  TYR*     3.6    37.9    -      -       +      +
    158A  LEU*     4.2    12.3    -      -       +      -
    163A  TYR*     3.7    24.0    -      -       +      +
    165A  PRO*     3.9    14.1    -      -       +      -
    169A  ASP*     3.8    25.1    -      -       +      +
    170A  VAL*     4.9     0.4    -      -       -      -
    173A  SER*     4.2     8.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  ILE*     2.9    40.9    +      -       +      +
     67A  ALA      3.8     0.2    -      -       -      +
     69A  ILE*     1.3    78.0    -      -       +      +
     71A  GLY*     1.3    60.0    +      -       -      +
     73A  THR*     3.3     7.2    +      -       -      -
     74A  LEU*     2.9    31.2    +      -       -      +
    113A  GLY*     3.5    30.3    -      -       -      +
    114A  THR*     4.0     8.5    -      -       -      +
    115A  MET*     3.5    38.6    -      -       +      +
    155A  LEU*     5.6     1.8    -      -       +      -
    158A  LEU*     2.5    41.7    +      -       +      -
    159A  VAL*     3.8    15.9    -      -       +      +
    163A  TYR*     4.2     7.2    -      +       -      +
----------------------------------------------------------
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Residues in contact with GLY 71 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  ALA      3.0    14.7    +      -       -      -
     68A  ILE*     3.7     3.1    -      -       -      -
     70A  TYR*     1.3    76.0    -      -       -      +
     72A  ASN*     1.3    58.4    +      -       -      +
     74A  LEU*     3.3     6.1    +      -       -      +
     75A  GLN*     2.9    39.6    +      -       -      +
    113A  GLY*     4.5    10.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 72 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ILE*     2.9    22.9    +      -       -      +
     69A  ILE*     3.5     5.8    -      -       -      +
     71A  GLY*     1.3    77.7    -      -       -      +
     73A  THR*     1.3    57.3    +      -       -      +
     75A  GLN*     3.5     4.6    +      -       -      +
     76A  SER*     2.9    34.0    +      -       -      +
    145A  ASN*     4.7     5.2    +      -       -      +
    151A  TYR*     4.1    16.7    -      -       +      -
    172A  ARG      4.6     0.3    -      -       -      +
    173A  SER*     3.3    14.4    -      -       -      -
    174A  ARG*     2.9    50.5    +      -       -      +
    176A  LYS*     4.5     8.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ILE*     2.8    27.1    +      -       -      +
     70A  TYR*     3.6     8.6    -      -       -      -
     72A  ASN*     1.3    73.4    -      -       -      +
     74A  LEU*     1.3    65.8    +      -       -      +
     76A  SER*     3.3     7.2    +      -       -      -
     77A  ILE*     3.2    22.5    +      -       -      +
    115A  MET*     4.5     8.3    -      -       +      -
    123A  ILE*     4.9     2.2    -      -       +      -
    151A  TYR*     3.4    28.1    -      -       +      +
    152A  LEU*     3.7    26.4    -      -       +      +
    155A  LEU*     4.1    24.2    -      -       +      -
    158A  LEU*     4.3     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  TYR      2.9    18.0    +      -       -      +
     71A  GLY*     3.8     5.4    -      -       -      +
     73A  THR*     1.3    77.4    -      -       -      +
     75A  GLN*     1.3    74.5    +      -       -      +
     77A  ILE*     3.3     9.3    -      -       +      +
     78A  LEU*     3.0    46.1    +      -       +      +
    103A  LEU*     4.0    14.4    -      -       +      -
    107A  ALA*     4.1    17.3    -      -       +      +
    110A  ILE*     4.1    16.2    -      -       +      -
    114A  THR      5.6     0.7    -      -       -      +
    115A  MET*     4.3     9.1    -      -       +      +
    119A  MET*     3.8    36.6    -      -       +      -
    123A  ILE*     4.4     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  GLY*     2.9    23.8    +      -       -      +
     72A  ASN*     4.0     5.4    -      -       -      +
     74A  LEU*     1.3    87.1    -      -       -      +
     76A  SER*     1.3    62.1    +      -       -      +
     78A  LEU*     3.6    24.4    +      -       -      +
     79A  ALA*     3.1    24.1    +      -       -      +
     82A  ARG*     4.7    11.4    +      -       -      +
    145A  ASN*     5.3     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 76 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  ASN      2.9    19.8    +      -       -      -
     73A  THR*     3.5     7.7    -      -       -      -
     74A  LEU      3.2     0.2    -      -       -      -
     75A  GLN*     1.3    76.7    -      -       -      +
     77A  ILE*     1.3    62.3    +      -       -      +
     79A  ALA*     3.3     5.2    +      -       -      +
     80A  ILE*     3.2    24.9    +      -       -      +
    144A  LEU*     3.6     8.7    -      -       -      +
    145A  ASN*     2.8    27.0    +      -       -      +
    147A  SER      5.0     0.2    -      -       -      -
    148A  ALA*     3.6    30.3    -      -       -      +
    151A  TYR*     5.7     1.8    -      -       -      -
    152A  LEU*     4.1     8.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 77 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  THR      3.2    10.6    +      -       -      +
     74A  LEU*     3.3    17.3    -      -       +      +
     76A  SER*     1.3    76.7    -      -       -      +
     78A  LEU*     1.3    59.9    +      -       -      +
     80A  ILE*     3.2    13.4    +      -       +      +
     81A  VAL*     2.9    35.1    +      -       +      +
    103A  LEU*     4.1    21.8    -      -       +      -
    123A  ILE*     3.9    37.5    -      -       +      -
    126A  LEU*     4.3    21.5    -      -       +      -
    127A  TRP*     4.7     5.8    -      -       +      +
    132A  ILE*     4.6    11.4    -      -       +      -
    152A  LEU*     4.0    23.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 78 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  LEU*     3.0    40.7    +      -       +      +
     75A  GLN*     3.8    20.6    -      -       -      +
     77A  ILE*     1.3    75.4    -      -       -      +
     79A  ALA*     1.3    57.3    +      -       -      +
     81A  VAL*     3.3     2.2    +      -       -      +
     82A  ARG*     2.9    61.8    +      -       -      +
    103A  LEU*     4.0    25.1    -      -       +      -
    104A  MET*     3.6    29.6    -      -       +      +
    107A  ALA*     3.9    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 79 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  GLN      3.1    17.9    +      -       -      +
     76A  SER      3.5     5.2    -      -       -      +
     77A  ILE      3.2     0.2    -      -       -      -
     78A  LEU*     1.3    77.0    -      -       -      +
     80A  ILE*     1.3    61.2    +      -       -      +
     82A  ARG*     3.5    14.5    +      -       -      +
     83A  ALA*     3.1    24.1    +      -       -      +
    142A  TYR*     3.9    12.5    -      -       +      +
    144A  LEU*     3.9    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 80 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  SER      3.2    15.7    +      -       -      +
     77A  ILE*     3.2    11.6    +      -       +      +
     79A  ALA*     1.3    74.4    -      -       -      +
     81A  VAL*     1.3    61.2    +      -       -      +
     83A  ALA      3.3     1.6    +      -       -      -
     84A  MET*     3.3    18.2    +      -       -      +
    127A  TRP*     4.0    17.0    -      -       +      -
    132A  ILE*     3.8    38.8    -      -       +      +
    135A  CYS*     3.4    10.2    -      -       -      -
    136A  PHE*     3.8    26.7    -      -       +      +
    142A  TYR*     3.6    25.4    -      -       -      +
    144A  LEU*     3.8    13.2    -      -       +      -
    148A  ALA*     5.0     0.2    -      -       +      -
    152A  LEU*     4.2    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 81 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  ILE*     2.9    24.6    +      -       +      +
     78A  LEU*     3.7     4.7    -      -       -      +
     80A  ILE*     1.3    75.6    -      -       -      +
     82A  ARG*     1.3    61.9    +      -       -      +
     84A  MET*     3.0    25.7    +      -       -      +
     85A  THR*     3.9     3.6    +      -       -      -
     91A  TYR*     3.7    16.9    +      -       -      +
    100A  ALA*     3.8    15.3    -      -       +      +
    103A  LEU*     4.3     6.3    -      -       +      -
    104A  MET*     3.3    24.2    -      -       +      -
    126A  LEU*     4.3    22.9    -      -       +      -
    132A  ILE*     4.2    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 82 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  GLN*     4.7    10.3    +      -       -      +
     78A  LEU*     2.9    63.5    +      -       -      +
     79A  ALA*     3.9    12.8    -      -       -      +
     81A  VAL*     1.3    73.8    -      -       -      +
     83A  ALA*     1.3    57.5    +      -       -      +
     85A  THR*     3.1    22.9    +      -       -      -
     86A  THR*     3.1    17.7    +      -       -      +
    104A  MET*     3.9    22.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 83 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  ALA      3.1    18.2    +      -       -      +
     81A  VAL      3.2     0.2    -      -       -      -
     82A  ARG*     1.3    73.1    -      -       -      +
     84A  MET*     1.3    60.6    +      -       -      +
     85A  THR      3.1     2.0    -      -       -      -
     86A  THR*     3.8    10.1    -      -       -      -
     87A  LEU*     2.8    36.4    +      -       +      +
    135A  CYS*     3.4    23.3    -      -       -      -
    142A  TYR*     3.7    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 84 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  ILE      3.3     8.8    +      -       -      +
     81A  VAL      3.0    15.3    +      -       -      +
     83A  ALA*     1.3    75.5    -      -       -      +
     85A  THR*     1.3    57.9    +      -       -      +
     88A  ASN*     2.9     8.5    +      -       -      -
     89A  ILE*     2.8    54.3    +      -       -      +
     90A  GLN      3.7     2.0    -      -       -      +
     91A  TYR*     3.7    50.0    -      -       +      +
    131A  GLY      3.6    25.8    -      -       -      +
    132A  ILE*     3.8    17.3    -      -       +      +
    135A  CYS*     3.6    27.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 85 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  VAL      4.7     3.1    +      -       -      -
     82A  ARG*     3.1    11.2    +      -       -      -
     83A  ALA      3.1     0.2    -      -       -      -
     84A  MET*     1.3    77.2    -      -       -      +
     86A  THR*     1.3    68.3    +      -       -      +
     88A  ASN*     2.9    17.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 86 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  ARG*     3.1    17.9    +      -       -      +
     83A  ALA*     4.1     8.6    -      -       -      -
     85A  THR*     1.3    81.0    -      -       -      +
     87A  LEU*     1.3    69.7    +      -       +      +
     88A  ASN*     5.0     1.2    -      -       -      +
    142A  TYR*     6.3     3.1    -      -       +      -
----------------------------------------------------------
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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