Contacts of the helix formed by residues 65 - 92 (chain D) in PDB entry 3AEF


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 CYS 65 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63D  ASN*     3.3    27.0    +      -       -      +
     64D  PRO*     1.3    75.1    -      -       -      +
     66D  SER*     1.3    65.8    +      -       -      +
     67D  ALA*     4.0    10.3    -      -       -      +
     68D  MET*     3.6    27.8    -      -       -      +
     69D  ASP*     3.0    26.8    +      -       -      +
    127D  CYS*     4.4     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 66 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  CYS*     1.3    72.7    -      -       -      +
     67D  ALA*     1.3    56.5    +      -       -      +
     68D  MET      3.0     4.3    -      -       -      -
     69D  ASP*     2.6    39.5    +      -       -      +
     70D  TYR*     3.0    33.3    +      -       -      -
    120D  ASN*     4.9     6.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 67 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  CYS*     3.6    10.8    -      -       -      -
     66D  SER*     1.3    77.9    -      -       -      +
     68D  MET*     1.3    58.5    +      -       +      +
     70D  TYR*     3.7     8.3    +      -       -      +
     71D  SER*     2.7    36.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 68 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56D  LEU*     3.8    26.0    -      -       +      -
     59D  ALA*     4.5    10.3    -      -       +      -
     60D  ALA*     3.6    30.1    -      -       +      +
     63D  ASN*     3.5    25.8    -      -       -      +
     65D  CYS*     3.6    29.0    +      -       -      +
     66D  SER      3.0     0.2    -      -       -      -
     67D  ALA*     1.3    86.5    -      -       +      +
     69D  ASP*     1.3    62.2    +      -       -      +
     71D  SER*     4.2     4.6    -      -       -      +
     72D  LEU*     3.3    27.5    +      -       -      +
    127D  CYS*     4.5     3.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 69 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  CYS      3.0    15.7    -      -       -      +
     66D  SER*     2.6    25.6    +      -       -      +
     68D  MET*     1.3    72.3    -      -       -      +
     70D  TYR*     1.3    56.3    +      -       +      +
     72D  LEU*     3.6     6.8    +      -       -      +
     73D  ALA*     3.1    20.1    +      -       -      +
    120D  ASN*     3.4    31.1    +      -       +      +
    124D  VAL      4.9     1.7    -      -       -      +
    125D  GLY*     4.2     9.6    -      -       -      -
    126D  ILE*     3.4    16.9    +      -       -      +
    127D  CYS*     2.9    40.7    +      -       -      +
    128D  LYS      5.5     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 70 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66D  SER*     3.0    44.2    +      -       -      +
     67D  ALA*     4.3     6.5    -      -       -      +
     69D  ASP*     1.3    73.1    -      -       -      +
     71D  SER*     1.3    55.2    +      -       -      +
     72D  LEU      3.1     1.6    -      -       -      -
     73D  ALA*     2.9     4.7    +      -       -      +
     74D  ALA*     2.7    35.9    +      -       -      +
    113D  PHE*     4.7     2.2    -      -       +      -
    117D  CYS*     3.8    33.0    -      -       +      -
    120D  ASN*     3.5    27.4    -      -       +      +
    121D  TYR*     3.2    39.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 71 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56D  LEU*     3.7    26.6    -      -       -      +
     67D  ALA*     2.7    22.7    +      -       -      +
     68D  MET*     4.2     6.4    -      -       -      +
     70D  TYR*     1.3    76.8    -      -       -      +
     72D  LEU*     1.3    52.8    +      -       -      +
     74D  ALA*     3.3     6.2    +      -       -      +
     75D  ALA*     2.8    38.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 72 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53D  LEU*     4.8     5.8    -      -       +      -
     56D  LEU*     3.8    34.1    -      -       +      +
     57D  LEU*     3.8    21.1    -      -       +      -
     60D  ALA*     4.2    15.9    -      -       +      -
     68D  MET      3.3    18.8    +      -       -      +
     69D  ASP      3.6     5.4    -      -       -      +
     70D  TYR      3.1     0.2    -      -       -      -
     71D  SER*     1.3    79.9    -      -       -      +
     73D  ALA*     1.3    57.2    +      -       -      +
     76D  LEU*     2.8    42.1    +      -       +      +
    126D  ILE*     3.7    33.4    -      -       +      -
    127D  CYS*     4.7     4.5    -      -       -      -
   1306D  EPH      4.0    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 73 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69D  ASP      3.1    14.1    +      -       -      +
     70D  TYR*     2.9    11.2    +      -       -      +
     72D  LEU*     1.3    74.1    -      -       -      +
     74D  ALA*     1.3    67.3    +      -       -      +
     77D  THR*     3.1    29.3    +      -       -      +
    113D  PHE*     3.9    14.4    -      -       +      -
    116D  LEU*     3.9    34.1    -      -       +      -
    117D  CYS*     4.9     2.2    -      -       -      +
    120D  ASN*     4.0    10.1    -      -       -      +
    126D  ILE*     4.3     2.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 74 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70D  TYR      2.7    15.7    +      -       -      +
     71D  SER*     3.6    10.1    -      -       -      +
     73D  ALA*     1.3    73.9    -      -       -      +
     75D  ALA*     1.3    59.3    +      -       -      +
     77D  THR*     3.7     2.1    +      -       -      -
     78D  LEU*     2.9    33.3    +      -       -      +
    113D  PHE*     3.6    20.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 75 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49D  VAL*     5.2    10.4    -      -       +      +
     52D  LEU*     5.3     8.3    -      -       +      -
     53D  LEU*     3.8    18.2    -      -       +      +
     56D  LEU*     3.7    22.9    -      -       +      -
     71D  SER      2.8    20.8    +      -       -      +
     72D  LEU      4.4     0.2    -      -       -      +
     74D  ALA*     1.3    72.9    -      -       -      +
     76D  LEU*     1.3    57.5    +      -       -      +
     78D  LEU*     4.5     4.5    -      -       -      -
     79D  HIS*     2.8    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 76 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56C  VAL*     3.8    34.9    -      -       +      +
   1305C  HEM      3.9    32.9    -      -       +      +
     53D  LEU*     3.6    24.8    -      -       +      +
     57D  LEU*     5.2     4.0    -      -       +      -
     72D  LEU*     2.8    30.7    +      -       +      +
     73D  ALA*     4.0     2.5    -      -       -      +
     75D  ALA*     1.3    76.9    -      -       -      +
     77D  THR*     1.3    57.8    +      -       +      +
     79D  HIS*     4.1     0.9    -      -       -      +
     80D  GLY*     3.0    24.8    +      -       -      -
    116D  LEU*     4.8     4.5    -      -       +      -
    126D  ILE*     4.9     4.7    -      -       +      -
   1306D  EPH      3.9    36.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 77 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56C  VAL*     4.5     3.6    -      -       +      -
     73D  ALA      3.1    19.3    +      -       -      +
     74D  ALA      3.7     2.1    +      -       -      -
     76D  LEU*     1.3    74.7    -      -       -      +
     78D  LEU*     1.3    58.0    +      -       -      +
     80D  GLY*     4.7     1.3    -      -       -      -
     81D  HIS*     2.6    37.0    +      -       -      +
    109D  SER*     4.6     9.1    +      -       -      -
    112D  THR*     3.7    25.4    -      -       +      -
    113D  PHE*     3.5    28.8    -      -       -      +
    116D  LEU*     3.6    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 78 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49D  VAL*     3.8    20.6    -      -       +      -
     74D  ALA      2.9    19.9    +      -       -      +
     75D  ALA*     4.0     3.6    -      -       -      +
     77D  THR*     1.3    75.5    +      -       -      +
     79D  HIS*     1.3    66.2    +      -       -      +
     81D  HIS*     3.3     9.8    +      -       +      +
     82D  TRP*     3.0    72.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 79 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1305C  HEM      2.1    85.6    +      +       +      -
     46D  GLU*     4.7     1.0    +      -       -      +
     49D  VAL*     4.1    19.7    -      -       +      +
     50D  SER*     3.3    31.4    +      -       -      -
     53D  LEU*     3.7    19.9    -      -       +      +
     75D  ALA      2.8    22.4    +      -       -      +
     76D  LEU      4.1     0.7    -      -       -      +
     78D  LEU*     1.3    72.6    -      -       -      +
     80D  GLY*     1.3    62.9    +      -       -      +
     82D  TRP*     3.3     4.2    +      -       -      +
     83D  GLY*     3.0    20.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 80 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53C  SER*     3.7    21.0    +      -       -      -
   1305C  HEM      4.4     9.6    -      -       -      -
     76D  LEU      3.0    19.2    +      -       -      -
     77D  THR*     3.7     1.8    -      -       -      -
     79D  HIS*     1.3    77.7    -      -       -      +
     81D  HIS*     1.3    62.5    +      -       -      +
     83D  GLY*     3.2     1.6    +      -       -      -
     84D  ILE*     3.1    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 81 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77D  THR      2.6    23.2    +      -       -      +
     78D  LEU*     3.6    12.1    -      -       +      +
     80D  GLY*     1.3    73.9    -      -       -      +
     82D  TRP*     1.3    80.2    +      +       -      +
     85D  GLY*     3.1    17.7    +      -       -      -
    102D  LYS*     5.0     4.2    -      -       +      +
    105D  LEU*     3.6    43.3    -      -       +      +
    106D  LEU*     3.9    28.2    -      -       +      +
    109D  SER*     2.6    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 82 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42D  HIS*     3.3    36.1    +      +       -      -
     45D  GLY*     3.7    16.2    -      -       -      -
     46D  GLU*     3.6    51.8    -      -       +      +
     49D  VAL*     3.9    20.4    -      -       +      -
     78D  LEU*     3.0    48.5    +      -       +      +
     79D  HIS*     4.0     3.1    -      -       -      +
     81D  HIS*     1.3    92.5    -      +       -      +
     83D  GLY*     1.3    64.6    +      -       -      +
     85D  GLY*     3.3     3.0    +      -       -      -
     86D  GLN*     3.2    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 83 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1305C  HEM      3.5    39.1    -      -       -      +
     79D  HIS*     3.0    13.5    +      -       -      -
     80D  GLY      3.2     2.9    +      -       -      -
     82D  TRP*     1.3    73.8    -      -       -      +
     84D  ILE*     1.3    65.4    +      -       -      +
     86D  GLN*     3.1    19.3    +      -       -      +
     87D  VAL*     3.2     8.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 84 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50C  ILE*     4.2    25.8    -      -       +      +
     53C  SER*     4.4    16.6    -      -       -      -
   1305C  HEM      3.8    18.3    -      -       +      +
     80D  GLY      3.1    13.8    +      -       -      +
     83D  GLY*     1.3    71.1    -      -       -      +
     85D  GLY*     1.3    56.4    +      -       -      +
     87D  VAL*     3.0    11.4    +      -       +      +
     88D  VAL*     2.7    46.2    +      -       +      +
    105D  LEU*     3.7    34.3    -      -       +      -
    108D  LEU*     6.2     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 85 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81D  HIS      3.1    15.1    +      -       -      -
     82D  TRP*     3.5     7.4    -      -       -      -
     83D  GLY      3.1     1.2    -      -       -      -
     84D  ILE*     1.3    75.8    -      -       -      +
     86D  GLN*     1.3    49.4    +      -       -      +
     88D  VAL*     3.2     2.8    +      -       -      +
     89D  THR*     2.5    43.7    +      -       -      +
    102D  LYS*     3.9    12.0    -      -       -      -
    105D  LEU*     3.5    11.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 86 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213B  TYR*     5.4     3.2    +      -       -      +
    214B  ARG*     2.7    38.8    +      -       -      +
    216B  HIS*     4.4     9.4    -      -       +      -
     46C  ARG*     4.2     5.8    -      -       -      +
   1305C  HEM      4.1    14.4    -      -       -      +
     42D  HIS*     3.9    12.5    +      -       -      -
     43D  TRP*     5.9     1.8    -      -       -      -
     46D  GLU*     2.7    36.2    +      -       -      +
     47D  ARG*     5.2     1.6    -      -       -      +
     82D  TRP      3.2    13.4    +      -       -      +
     83D  GLY*     3.1     9.5    +      -       -      +
     85D  GLY*     1.3    73.1    -      -       -      +
     87D  VAL*     1.3    56.9    +      -       -      +
     89D  THR*     3.3     6.5    +      -       -      +
     90D  ASP*     2.9    35.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 87 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46C  ARG*     3.2    37.5    -      -       -      +
     50C  ILE*     4.3    23.6    -      -       +      -
   1305C  HEM      4.2     9.2    -      -       +      -
     83D  GLY      3.2    11.0    +      -       -      +
     84D  ILE*     3.0    17.6    +      -       +      +
     86D  GLN*     1.3    72.5    -      -       -      +
     88D  VAL*     1.3    71.0    +      -       +      +
     90D  ASP*     3.3     1.1    +      -       -      +
     91D  TYR*     3.1    45.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 88 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84D  ILE*     2.7    37.8    +      -       +      +
     85D  GLY      3.5     3.6    -      -       -      +
     87D  VAL*     1.3    75.6    -      -       +      +
     89D  THR*     1.3    59.9    +      -       -      +
     90D  ASP      3.1     0.2    +      -       -      -
     92D  VAL*     2.8    49.8    +      -       +      +
     98D  GLN*     4.2     9.4    -      -       +      -
    101D  ALA*     3.8    33.0    -      -       +      -
    102D  LYS*     4.2    18.8    -      -       -      +
    105D  LEU*     4.9     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 89 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174B  ASN*     4.3     1.7    +      -       -      -
    209B  PRO*     5.0     5.2    -      -       +      +
    210B  PHE*     3.8    29.6    -      -       -      -
    214B  ARG*     3.3    24.3    +      -       -      +
     85D  GLY      2.5    39.0    +      -       -      +
     86D  GLN*     3.3    12.3    +      -       -      +
     88D  VAL*     1.3    75.4    -      -       -      +
     90D  ASP*     1.3    59.9    +      -       -      +
     92D  VAL      4.7     3.0    +      -       -      +
     93D  ARG*     6.1     0.2    -      -       -      -
     98D  GLN*     3.2    20.6    -      -       -      +
    102D  LYS*     3.6    19.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 90 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170B  SER*     5.6     2.9    -      -       -      -
    173B  TRP*     4.2     7.5    -      -       +      +
    174B  ASN*     2.7    28.1    +      -       -      +
    214B  ARG*     2.7    35.6    +      -       -      +
    216B  HIS*     2.7    26.3    +      -       -      -
     46C  ARG*     2.8    21.3    +      -       -      +
     86D  GLN      2.9    15.7    +      -       -      +
     87D  VAL      3.6     5.4    -      -       -      +
     88D  VAL      3.1     0.2    -      -       -      -
     89D  THR*     1.3    79.5    -      -       -      +
     91D  TYR*     1.3    77.9    +      -       +      +
     92D  VAL      5.4     0.2    -      -       -      -
     93D  ARG*     4.5     4.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 91 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173B  TRP*     3.5    40.8    +      +       +      -
     46C  ARG*     3.1    36.2    +      -       -      +
     50C  ILE*     6.0     1.8    -      -       +      -
     87D  VAL*     3.1    34.6    +      -       +      +
     90D  ASP*     1.3    86.0    -      -       +      +
     92D  VAL*     1.3    64.9    +      -       +      +
     93D  ARG*     3.3    16.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 92 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88D  VAL*     2.8    47.4    +      -       +      +
     89D  THR      4.9     2.5    -      -       -      +
     90D  ASP      3.7     0.6    -      -       -      -
     91D  TYR*     1.3    75.2    -      -       +      +
     93D  ARG*     1.3    59.3    +      -       -      +
     94D  GLY      3.8     1.0    +      -       -      -
     97D  LEU*     3.8    42.0    -      -       +      +
     98D  GLN*     3.8    30.5    -      -       +      +
    101D  ALA*     4.6     8.1    -      -       +      -
----------------------------------------------------------
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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