Contacts of the helix formed by residues 37 - 61 (chain A) in PDB entry 5FWP


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with GLU 37 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  ASN*     2.8    32.3    +      -       -      +
     36A  LYS*     1.3    72.7    -      -       -      +
     38A  ILE*     1.3    57.6    +      -       -      +
     39A  PHE      3.0    10.8    +      -       -      -
     40A  LEU      3.4     5.2    +      -       -      -
     41A  ARG      3.7     3.5    +      -       -      -
    192A  TYR*     4.4     3.6    +      -       -      -
    197A  ARG*     3.2    38.9    +      -       -      +
    201A  VAL*     3.3    34.8    -      -       +      +
    204A  LYS*     2.9    40.1    +      -       -      -
    205A  HIS*     3.9    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 38 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  TYR*     3.8    23.3    -      -       +      -
     35A  ASN*     3.1    27.4    -      -       +      +
     37A  GLU*     1.3    73.1    -      -       -      +
     39A  PHE*     1.3    60.7    +      -       -      +
     40A  LEU      3.4     0.2    -      -       -      -
     41A  ARG*     3.6    27.4    -      -       -      +
     42A  GLU*     2.9    33.7    +      -       +      +
    135A  SER*     3.4    33.9    -      -       -      +
    138A  LEU*     3.7    13.0    -      -       +      -
    205A  HIS*     5.2     2.7    -      -       +      -
    393A  GLU*     3.2    32.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 39 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  LYS      3.0    18.4    +      -       -      +
     37A  GLU*     3.0     0.6    -      -       -      -
     38A  ILE*     1.3    87.0    -      -       +      +
     40A  LEU*     1.3    95.3    +      -       +      +
     42A  GLU*     4.2     1.4    -      -       -      +
     43A  LEU*     3.1    42.5    +      -       +      +
     84A  LEU*     3.9    17.3    -      -       +      -
    135A  SER*     4.1     7.2    +      -       -      +
    136A  ALA*     3.1    43.5    -      -       +      -
    138A  LEU*     5.3     1.1    -      -       +      -
    139A  VAL*     3.4    31.0    -      -       +      -
    140A  ALA*     4.5     1.3    -      -       +      -
    183A  LEU*     3.7    22.0    -      -       +      -
    185A  LEU*     4.3     5.2    -      -       +      -
    192A  TYR*     5.5     9.0    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 40 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  GLU      3.4     2.2    +      -       -      -
     38A  ILE      3.4     0.2    -      -       -      -
     39A  PHE*     1.3   103.7    -      -       +      +
     41A  ARG*     1.3    65.9    +      -       -      +
     43A  LEU*     3.7     9.5    -      -       +      +
     44A  ILE*     2.9    40.3    +      -       +      +
     75A  ILE*     4.7    20.4    -      -       +      -
     84A  LEU*     4.8    11.2    -      -       +      -
     86A  LEU*     6.5     0.2    -      -       +      -
    183A  LEU*     5.3     2.7    -      -       +      -
    192A  TYR*     5.1     8.5    -      -       +      -
    198A  VAL*     4.4    21.3    -      -       +      +
    201A  VAL*     3.9    35.0    -      -       +      -
    202A  VAL*     4.1    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 41 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  TYR*     4.5     2.0    -      -       -      -
     37A  GLU      3.7     3.4    +      -       -      +
     38A  ILE*     3.3    33.4    +      -       -      +
     39A  PHE      3.3     0.6    -      -       -      -
     40A  LEU*     1.3    79.8    -      -       -      +
     42A  GLU*     1.3    80.2    +      -       -      +
     44A  ILE*     3.5     6.8    +      -       -      +
     45A  SER*     2.7    44.5    +      -       -      +
    201A  VAL*     5.0     1.2    -      -       -      +
    205A  HIS*     3.6    51.7    +      -       +      +
    206A  SER*     6.3     0.2    -      -       -      -
    360A  VAL*     4.1    20.6    -      -       +      -
    361A  PHE      4.8     5.4    +      -       -      -
    362A  ILE*     5.2     3.1    -      -       -      +
    391A  SER      3.4    14.5    +      -       -      -
    392A  ARG*     3.8    14.9    +      -       -      +
    393A  GLU*     2.7    33.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 42 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  TYR*     4.8     9.2    -      -       -      +
     38A  ILE*     2.9    32.7    +      -       +      +
     39A  PHE      4.2     1.3    -      -       -      +
     41A  ARG*     1.3    97.4    +      -       -      +
     43A  LEU*     1.3    66.9    +      -       +      +
     45A  SER*     3.4     3.2    +      -       -      -
     46A  ASN*     3.0    32.3    +      -       -      +
    132A  GLY*     4.3    11.5    -      -       -      +
    133A  PHE*     5.9     0.2    -      -       -      -
    135A  SER*     4.1    13.2    -      -       -      +
    392A  ARG*     2.8    36.5    +      -       -      -
   1691A  ATP      3.1    27.0    +      -       -      +
   1692A   MG      3.8     1.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 43 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  PHE*     3.1    46.3    +      -       +      +
     40A  LEU*     3.7     9.6    -      -       +      +
     42A  GLU*     1.3    77.6    -      -       +      +
     44A  ILE*     1.3    62.6    +      -       +      +
     46A  ASN*     3.3    10.6    +      -       -      +
     47A  ALA      3.1    16.6    +      -       -      -
     86A  LEU*     3.5    26.1    -      -       +      +
    133A  PHE*     5.0    13.7    -      -       +      +
    136A  ALA*     4.4    18.6    -      -       +      -
    181A  VAL*     4.5    13.2    -      -       +      -
    183A  LEU*     3.6    35.9    -      -       +      -
   1691A  ATP      5.0     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 44 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  LEU*     2.9    27.0    +      -       +      +
     41A  ARG*     3.8     5.4    -      -       -      +
     43A  LEU*     1.3    74.5    -      -       +      +
     45A  SER*     1.3    63.0    +      -       -      +
     47A  ALA*     3.1     8.3    +      -       -      +
     48A  SER*     2.9    26.0    +      -       -      -
     73A  ILE*     3.6    17.2    -      -       +      +
     75A  ILE*     4.1    22.2    -      -       +      -
     86A  LEU*     4.8     4.0    -      -       +      -
    202A  VAL*     4.0    26.7    -      -       +      -
    205A  HIS*     6.5     0.2    -      -       +      -
    206A  SER*     4.1    14.8    -      -       -      -
    209A  ILE*     4.2    15.5    -      -       +      -
    213A  ILE*     3.7    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 45 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  ARG*     2.7    33.1    +      -       -      +
     42A  GLU*     3.6     9.0    -      -       -      -
     44A  ILE*     1.3    78.5    -      -       -      +
     46A  ASN*     1.3    57.8    +      -       -      +
     48A  SER*     2.6    24.9    +      -       -      -
     49A  ASP*     2.9    20.2    +      -       -      +
    126A  ILE*     4.6    18.7    -      -       -      +
    209A  ILE*     5.5     3.9    -      -       -      +
    360A  VAL*     4.9     7.1    -      -       -      +
    392A  ARG*     4.1    14.2    +      -       -      -
   1692A   MG      4.6     5.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 46 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42A  GLU*     3.0    17.8    +      -       -      +
     43A  LEU*     3.6     9.5    -      -       -      +
     45A  SER*     1.3    72.5    -      -       -      +
     47A  ALA*     1.3    66.5    +      -       -      +
     49A  ASP*     3.2    10.3    +      -       -      +
     50A  ALA*     3.1    21.5    +      -       -      +
    132A  GLY      5.1     0.2    -      -       -      -
    133A  PHE*     4.4    16.8    -      -       -      +
   1691A  ATP      2.9    60.7    +      -       +      +
   1692A   MG      1.4    36.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 47 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  LEU      3.1    13.2    +      -       -      +
     44A  ILE      3.1     9.5    +      -       -      +
     46A  ASN*     1.3    77.0    -      -       -      +
     48A  SER*     1.3    56.1    +      -       -      +
     50A  ALA      3.2     1.6    +      -       -      -
     51A  LEU*     3.0    30.2    +      -       -      +
     73A  ILE*     3.8    28.5    -      -       +      -
     86A  LEU*     4.4     6.7    -      -       +      -
     88A  ASP*     3.3    33.6    -      -       +      +
   1691A  ATP      4.1     1.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 48 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  ILE      2.9    11.6    +      -       -      -
     45A  SER*     2.6    25.2    +      -       -      -
     47A  ALA*     1.3    73.6    -      -       -      +
     49A  ASP*     1.3    60.3    +      -       -      +
     51A  LEU*     3.2    10.5    +      -       -      +
     52A  ASP*     2.9    35.5    +      -       -      +
     73A  ILE*     3.8    14.6    -      -       -      +
    126A  ILE*     4.1    17.9    -      -       -      +
    209A  ILE*     4.2    18.6    -      -       -      +
    211A  TYR*     4.6     4.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 49 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  SER      2.9    21.2    +      -       -      +
     46A  ASN*     3.4    17.1    -      -       -      +
     48A  SER*     1.3    79.4    +      -       -      +
     50A  ALA*     1.3    56.6    +      -       -      +
     52A  ASP*     3.1     7.9    +      -       -      +
     53A  LYS*     2.9    36.2    +      -       -      +
    110A  THR*     4.0    22.6    -      -       +      +
    125A  MET*     3.5    14.9    -      -       -      +
    126A  ILE*     2.8    45.9    +      -       -      +
   1691A  ATP      4.1     3.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 50 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  ASN      3.1     5.6    +      -       -      +
     47A  ALA      3.2     2.2    +      -       -      +
     49A  ASP*     1.3    75.9    -      -       -      +
     51A  LEU*     1.3    61.2    +      -       -      +
     53A  LYS*     3.3    14.4    +      -       -      +
     54A  ILE*     3.2    13.3    +      -       -      +
     88A  ASP*     3.3    26.9    -      -       -      +
     90A  GLY*     3.5    12.1    -      -       -      -
     91A  ILE*     3.0    22.2    +      -       +      +
     92A  GLY      4.3     2.0    -      -       -      +
   1691A  ATP      3.7    21.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 51 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  ALA      3.0    15.5    +      -       -      +
     48A  SER*     3.4     7.6    -      -       -      +
     50A  ALA*     1.3    75.6    -      -       -      +
     52A  ASP*     1.3    59.1    +      -       -      +
     54A  ILE*     3.3     6.0    +      -       -      +
     55A  ARG*     3.0    26.3    +      -       -      +
     71A  LEU*     3.7    17.2    -      -       +      +
     72A  LYS      3.7     9.2    -      -       -      +
     73A  ILE*     3.5    33.4    -      -       +      -
     88A  ASP*     4.1     0.9    -      -       -      +
     89A  THR*     3.3    29.4    -      -       -      +
     90A  GLY*     3.5    16.6    -      -       -      +
    211A  TYR*     3.5    41.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 52 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  SER*     2.9    22.3    +      -       -      +
     49A  ASP*     3.3    16.5    -      -       -      +
     51A  LEU*     1.3    73.8    -      -       -      +
     53A  LYS*     1.3    64.8    +      -       -      +
     55A  ARG*     2.7    42.4    +      -       -      +
     56A  TYR*     3.1    19.1    +      -       -      +
    123A  ILE*     3.8    11.4    -      -       +      +
    124A  SER      3.3    21.9    -      -       -      +
    125A  MET*     3.8    15.7    -      -       +      +
    126A  ILE*     5.1     3.6    -      -       -      +
    211A  TYR*     3.6     7.3    -      -       -      -
    359A  ARG*     5.3     5.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 53 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  ASP*     2.9    24.6    +      -       -      +
     50A  ALA*     3.3    11.2    -      -       -      +
     52A  ASP*     1.3    76.8    -      -       -      +
     54A  ILE*     1.3    61.8    +      -       -      +
     56A  TYR*     3.4     3.2    +      -       -      +
     57A  GLU*     3.1    28.8    +      -       -      +
     91A  ILE*     3.5    26.8    -      -       +      +
     92A  GLY      5.2     2.8    +      -       -      -
     93A  MET*     5.6     1.6    -      -       -      +
    109A  GLY*     4.4     8.8    -      -       -      -
    110A  THR*     4.8     7.4    -      -       -      -
    113A  PHE*     3.5    42.6    -      -       +      -
    125A  MET*     3.5    18.4    -      -       +      -
   1691A  ATP      3.7    41.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 54 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  ALA      3.2     2.9    +      -       -      +
     51A  LEU*     3.5     5.4    -      -       +      +
     52A  ASP      3.3     0.2    -      -       -      -
     53A  LYS*     1.3    76.2    -      -       -      +
     55A  ARG*     1.3    68.2    +      -       -      +
     57A  GLU*     3.0     5.6    +      -       +      +
     58A  SER*     2.7    29.6    +      -       -      +
     64A  LYS*     5.5     2.0    -      -       +      +
     65A  LEU*     3.4    30.1    -      -       +      -
     71A  LEU*     3.4    21.5    -      -       +      -
     89A  THR      3.2    27.1    -      -       -      +
     90A  GLY*     3.3    14.6    -      -       -      -
     91A  ILE*     3.4    30.1    -      -       +      +
    177A  ARG*     3.4    16.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 55 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  LEU      3.0     4.4    +      -       -      +
     52A  ASP*     2.7    43.0    +      -       -      +
     54A  ILE*     1.3    79.6    -      -       -      +
     56A  TYR*     1.3    57.1    +      -       -      +
     58A  SER*     3.0     7.3    +      -       -      +
     59A  LEU*     2.8    35.8    +      -       +      +
     71A  LEU*     4.6     5.8    -      -       +      -
    122A  ASP*     4.2     5.9    +      -       -      -
    123A  ILE*     3.6    37.5    -      -       +      +
    124A  SER      4.4     3.0    +      -       -      +
    211A  TYR*     2.8    35.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 56 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  ASP      3.1     6.6    +      -       -      +
     53A  LYS*     3.7     7.4    -      -       -      +
     55A  ARG*     1.3    82.1    -      -       -      +
     57A  GLU*     1.3    77.1    +      -       +      +
     59A  LEU*     3.1    12.3    +      -       +      +
     60A  THR*     3.1    50.5    +      -       +      +
    113A  PHE*     5.1     2.7    -      +       +      -
    116A  ALA      5.2     2.4    +      -       -      -
    117A  LEU*     3.3    28.1    -      -       +      +
    119A  ALA*     3.7    19.4    +      -       +      +
    120A  GLY*     3.4    35.4    +      -       -      -
    123A  ILE*     3.8    25.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 57 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  LYS      3.1    15.8    +      -       -      +
     54A  ILE*     3.0     4.9    +      -       -      +
     56A  TYR*     1.3    92.5    -      -       +      +
     58A  SER*     1.3    52.6    +      -       -      +
     60A  THR*     3.2     6.5    +      -       -      -
     61A  ASP*     2.7    36.9    +      -       -      +
     64A  LYS*     3.5    35.9    +      -       +      +
     91A  ILE*     3.3    31.9    -      -       -      +
    113A  PHE*     3.8    23.7    -      -       +      -
    149A  HIS*     4.4    10.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 58 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ILE*     2.7    28.8    +      -       -      +
     55A  ARG*     3.0    13.0    +      -       -      +
     57A  GLU*     1.3    72.3    -      -       -      +
     59A  LEU*     1.3    63.2    +      -       -      +
     61A  ASP      3.4     9.9    -      -       -      -
     62A  PRO*     3.0    25.6    -      -       -      +
     64A  LYS*     4.0     3.5    -      -       -      +
     65A  LEU*     3.5    40.5    -      -       -      +
     71A  LEU*     5.6     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 59 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  ARG*     2.8    24.4    +      -       +      +
     56A  TYR*     3.2    20.6    -      -       +      +
     58A  SER*     1.3    79.4    +      -       -      +
     60A  THR*     1.3    64.6    +      -       +      +
     62A  PRO*     4.6     4.5    -      -       -      +
    120A  GLY*     6.1     0.4    -      -       -      -
    122A  ASP*     4.5    22.2    -      -       -      +
    123A  ILE*     4.9     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  TYR*     3.1    47.3    +      -       +      +
     57A  GLU*     3.2    11.6    +      -       -      -
     59A  LEU*     1.3    83.5    -      -       +      +
     61A  ASP*     1.3    61.8    +      -       -      +
     62A  PRO*     3.9     3.6    -      -       -      +
    119A  ALA*     5.4     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  GLU      2.7    11.3    +      -       -      +
     58A  SER*     3.2     4.3    -      -       -      -
     60A  THR*     1.3    83.8    -      -       -      +
     62A  PRO*     1.3    57.1    -      -       -      +
     63A  SER*     2.6    31.1    +      -       -      -
     64A  LYS*     2.9    51.5    +      -       +      +
----------------------------------------------------------
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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