Contacts of the helix formed by residues 40 - 66 (chain B) in PDB entry 1VGO


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 40 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  ASP*     2.6    34.0    +      -       -      +
    235A  LEU*     3.6    10.7    -      -       -      +
    236A  GLY*     5.9     0.4    -      -       -      -
     38B  VAL*     3.7     3.5    -      -       +      +
     39B  THR*     1.3    82.1    +      -       -      +
     41B  LYS*     1.3    65.2    +      -       -      +
     43B  ALA*     2.9    36.5    +      -       +      +
     44B  ARG*     3.1    21.3    +      -       -      +
    235B  LEU*     3.7    10.9    -      -       +      +
    236B  GLY      2.8    36.4    +      -       -      +
    237B  GLU*     3.7     5.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 41 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  GLY      2.6    30.3    +      -       -      -
     39A  THR*     3.6    20.1    -      -       +      +
     39B  THR      3.1     3.6    +      -       -      -
     40B  ASP*     1.3    71.4    +      -       -      +
     42B  GLU*     1.3    70.4    +      -       +      +
     44B  ARG*     3.1    19.9    +      -       -      +
     45B  GLU*     3.6    16.4    +      -       -      +
    236B  GLY      3.5    10.5    -      -       -      +
    237B  GLU*     3.1    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 42 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  LYS*     1.3    78.8    -      -       +      +
     43B  ALA*     1.3    66.9    +      -       -      +
     45B  GLU*     2.9    34.4    +      -       -      +
     46B  TYR*     3.2    27.8    +      -       +      -
    107B  LYS*     3.2    25.7    +      -       -      +
    168B  ARG*     4.7     6.4    +      -       -      -
    234B  ILE      3.4    12.1    -      -       -      +
    235B  LEU      4.9     0.7    -      -       -      +
    236B  GLY*     3.0    36.9    +      -       -      +
    237B  GLU*     3.2     2.1    +      -       -      -
    238B  THR*     3.0    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 43 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38B  VAL*     3.6    13.2    -      -       +      -
     40B  ASP*     2.9    34.6    +      -       +      +
     42B  GLU*     1.3    76.1    -      -       -      +
     44B  ARG*     1.3    61.7    +      -       -      +
     46B  TYR*     3.4     3.6    +      -       -      +
     47B  TYR*     3.2    28.4    +      -       -      -
    234B  ILE*     3.0    35.8    +      -       +      +
    235B  LEU*     4.4     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 44 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  THR*     5.4     0.7    -      -       -      -
     35B  GLY      3.9    13.1    +      -       -      -
     36B  TRP*     4.5     2.8    +      -       -      +
     38B  VAL*     2.9    35.2    +      -       +      +
     39B  THR      3.8    10.3    -      -       -      -
     40B  ASP      3.1    11.9    +      -       -      +
     41B  LYS*     3.5    10.3    -      -       -      +
     42B  GLU      3.0     0.6    -      -       -      -
     43B  ALA*     1.3    75.2    -      -       -      +
     45B  GLU*     1.3    63.0    +      -       +      +
     47B  TYR*     3.8     7.3    -      -       -      +
     48B  ALA*     3.2    23.2    +      -       -      +
    402B  SO4      3.4    33.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 45 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  LYS*     3.6    14.7    +      -       -      +
     42B  GLU*     2.9    33.4    +      -       -      +
     44B  ARG*     1.3    76.0    -      -       -      +
     46B  TYR*     1.3    68.4    +      -       +      +
     48B  ALA*     3.4     4.8    +      -       -      +
     49B  ILE*     3.1    37.4    +      -       +      +
    104B  LEU*     4.3    19.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 46 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42B  GLU*     3.2    34.9    +      -       +      -
     43B  ALA      3.4     5.4    +      -       -      +
     45B  GLU*     1.3    79.5    -      -       +      +
     47B  TYR*     1.3    55.9    +      -       -      +
     49B  ILE*     3.7     1.3    -      -       -      +
     50B  THR*     2.6    37.4    +      -       -      -
    101B  ASP*     3.4    43.7    -      -       -      +
    104B  LEU*     3.1    43.9    +      -       +      +
    105B  LEU*     3.1    21.2    +      -       +      +
    107B  LYS*     5.7     0.5    -      -       -      -
    168B  ARG*     4.9     2.4    +      -       -      -
    228B  LEU*     4.4     3.6    -      -       +      -
    229B  LEU*     3.9     9.9    -      -       +      -
    233B  ALA      4.7     1.6    +      -       -      -
    234B  ILE*     3.2    49.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 47 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31B  PHE*     3.2    32.5    -      +       -      -
     34B  ARG*     3.0    42.3    +      -       +      +
     35B  GLY*     3.4    19.7    -      -       -      +
     38B  VAL*     3.7    24.6    -      -       +      +
     43B  ALA      3.2    22.8    +      -       -      -
     44B  ARG*     3.8     9.6    -      -       -      +
     46B  TYR*     1.3    78.3    -      -       -      +
     48B  ALA*     1.3    55.2    +      -       -      +
     50B  THR*     4.6     0.2    -      -       -      -
     51B  ILE*     2.7    49.1    +      -       +      +
    229B  LEU*     3.5    38.5    +      -       +      +
    234B  ILE*     4.0    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 48 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44B  ARG      3.2    14.8    +      -       -      +
     45B  GLU*     3.7     7.0    -      -       -      +
     46B  TYR      3.4     0.2    -      -       -      -
     47B  TYR*     1.3    79.6    -      -       -      +
     49B  ILE*     1.3    64.3    +      -       +      +
     51B  ILE*     3.9     8.5    -      -       -      +
     52B  LEU*     3.2    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 49 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45B  GLU*     3.1    22.7    +      -       +      +
     46B  TYR      3.7     2.5    -      -       -      +
     48B  ALA*     1.3    79.7    -      -       +      +
     50B  THR*     1.3    64.1    +      -       -      +
     52B  LEU*     3.3    23.8    +      -       -      +
     53B  VAL*     3.6     8.1    +      -       -      +
     97B  LEU*     3.4    41.8    -      -       +      +
    100B  LEU*     4.3    17.3    -      -       +      -
    101B  ASP*     3.7    14.6    -      -       -      +
    104B  LEU*     3.5    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 50 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31B  PHE*     4.3     6.1    -      -       +      -
     46B  TYR      2.6    25.8    +      -       -      -
     47B  TYR      3.9     0.4    -      -       -      -
     49B  ILE*     1.3    70.2    -      -       -      +
     51B  ILE*     1.3    61.0    +      -       -      +
     53B  VAL*     3.0    14.1    +      -       +      +
     54B  PRO*     2.8    28.2    -      -       -      +
     98B  LEU*     5.6     0.9    -      -       +      -
    101B  ASP*     2.9    24.4    +      -       -      +
    221B  LYS      4.9     2.5    -      -       -      +
    224B  PHE*     5.2     3.1    -      -       +      -
    225B  GLY*     3.7    23.1    -      -       -      -
    228B  LEU*     3.6     8.3    -      -       +      +
    229B  LEU*     3.6    28.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 51 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28B  THR*     3.9     7.8    -      -       +      +
     31B  PHE*     3.7    28.2    -      -       +      +
     32B  ILE*     3.6    48.0    -      -       +      +
     35B  GLY*     5.6     1.6    -      -       -      -
     47B  TYR*     2.7    38.9    +      -       +      +
     48B  ALA*     3.9     8.7    -      -       -      +
     50B  THR*     1.3    72.9    -      -       -      +
     52B  LEU*     1.3    68.5    +      -       +      +
     53B  VAL      3.2     0.2    +      -       -      -
     54B  PRO*     3.4     8.1    -      -       -      +
     55B  GLY*     3.1    19.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 52 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  ALA      3.2    17.5    -      -       -      +
     49B  ILE*     3.3    12.3    +      -       -      +
     50B  THR      3.1     0.8    -      -       -      -
     51B  ILE*     1.3    82.7    -      -       +      +
     53B  VAL*     1.3    57.9    +      -       -      +
     55B  GLY*     3.6     3.1    -      -       -      +
     56B  ILE*     2.7    47.5    +      -       +      +
     97B  LEU*     3.9    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 53 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49B  ILE      3.6    11.7    -      -       -      +
     50B  THR*     3.0    16.8    +      -       +      +
     52B  LEU*     1.3    80.5    -      -       -      +
     54B  PRO*     1.3    72.1    -      -       +      +
     57B  ALA*     3.0    19.2    +      -       -      +
     94B  THR*     3.5    28.7    +      -       +      -
     97B  LEU*     3.8    24.2    -      -       +      +
     98B  LEU*     4.0    24.7    -      -       +      +
    101B  ASP*     5.3     0.4    -      -       -      +
    221B  LYS*     3.5    30.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 54 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  MET*     3.3    33.4    -      -       +      +
     28B  THR*     3.2    23.5    +      -       -      +
     31B  PHE*     3.9    27.1    -      -       +      -
     50B  THR      2.8    25.6    -      -       -      +
     51B  ILE      3.4     6.3    -      -       -      +
     53B  VAL*     1.3    83.7    -      -       +      +
     55B  GLY*     1.3    63.5    +      -       -      +
     57B  ALA*     3.9     2.0    -      -       +      -
     58B  SER*     2.9    21.0    +      -       -      -
    221B  LYS*     4.7     7.0    -      -       +      +
    222B  VAL*     4.3    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 55 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28B  THR*     3.2    18.5    +      -       -      -
     51B  ILE      3.1    15.9    +      -       -      -
     52B  LEU*     3.6     4.5    -      -       -      -
     53B  VAL      3.0     1.4    -      -       -      -
     54B  PRO*     1.3    76.5    -      -       -      +
     56B  ILE*     1.3    61.4    +      -       -      +
     58B  SER*     2.8    22.8    +      -       -      -
     59B  ALA*     3.4     8.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 56 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  LEU*     2.7    35.1    +      -       +      +
     53B  VAL      4.0     2.2    -      -       -      +
     55B  GLY*     1.3    71.5    -      -       -      -
     57B  ALA*     1.3    61.8    +      -       -      +
     59B  ALA*     3.3     9.2    +      -       +      +
     60B  ALA*     3.1    20.3    +      -       +      +
     90B  ASP*     4.7    12.8    -      -       -      -
     93B  PHE*     4.0    31.0    -      -       +      -
     94B  THR*     4.2     9.9    -      -       -      +
     97B  LEU*     3.8    24.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 57 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  MET*     3.4    35.7    -      -       +      -
     53B  VAL      3.0    17.4    +      -       -      +
     55B  GLY      3.1     0.2    -      -       -      -
     56B  ILE*     1.3    79.9    -      -       -      +
     58B  SER*     1.3    57.3    +      -       -      +
     60B  ALA*     3.2     1.7    +      -       -      +
     61B  TYR*     3.0    34.5    +      -       -      -
     90B  ASP*     3.6    14.6    -      -       -      +
     94B  THR*     4.5     0.2    +      -       -      -
    221B  LYS*     3.6    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 58 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21B  THR*     3.7    19.3    -      -       -      +
     24B  MET*     3.6    20.4    -      -       -      +
     25B  LEU*     4.0    23.5    -      -       -      +
     28B  THR*     4.5     1.0    +      -       -      -
     54B  PRO      2.9    13.0    +      -       -      -
     55B  GLY*     2.8    22.0    +      -       -      -
     57B  ALA*     1.3    75.4    -      -       -      +
     59B  ALA*     1.3    57.5    +      -       -      +
     61B  TYR*     3.8     5.3    -      -       -      +
     62B  LEU*     3.1    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 59 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55B  GLY      3.4     6.5    +      -       -      +
     56B  ILE*     3.3    12.7    +      -       +      +
     57B  ALA      3.2     0.6    -      -       -      -
     58B  SER*     1.3    79.6    +      -       -      +
     60B  ALA*     1.3    63.5    +      -       -      +
     62B  LEU*     3.8     8.5    +      -       -      +
     63B  ALA*     3.5    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 60 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56B  ILE*     3.1    11.1    +      -       +      +
     57B  ALA      3.2     6.9    +      -       -      +
     59B  ALA*     1.3    77.1    -      -       -      +
     61B  TYR*     1.3    58.9    +      -       -      +
     62B  LEU      3.4     0.2    -      -       -      -
     63B  ALA*     3.5     1.2    +      -       -      -
     64B  MET*     3.0    35.7    +      -       +      +
     86B  ALA*     3.5    20.7    -      -       +      +
     90B  ASP*     3.6    34.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 61 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17B  LEU*     3.4    34.5    -      -       +      +
     20B  GLY*     3.7    25.1    -      -       -      -
     21B  THR*     3.4    17.8    +      -       -      +
     24B  MET*     4.5    11.0    -      -       +      -
     57B  ALA      3.0    25.4    +      -       -      +
     58B  SER*     3.8     4.3    -      -       -      +
     59B  ALA      3.3     0.2    -      -       -      -
     60B  ALA*     1.3    76.9    -      -       -      +
     62B  LEU*     1.3    58.9    +      -       -      +
     64B  MET*     3.4    28.0    +      -       +      +
     65B  PHE*     2.8    30.0    +      -       -      +
     87B  ARG*     5.6     2.8    +      -       -      -
     90B  ASP*     4.2    10.1    -      -       -      -
    210B  THR*     6.2     0.9    -      -       +      -
    213B  PHE*     4.2     1.7    -      -       -      +
    214B  MET*     3.3    32.0    +      -       +      +
    217B  ASP*     2.7    32.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 62 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21B  THR*     3.7    20.1    +      -       +      -
     58B  SER      3.1    17.4    +      -       -      +
     59B  ALA*     4.0     8.5    -      -       -      +
     61B  TYR*     1.3    76.0    -      -       -      +
     63B  ALA*     1.3    63.7    +      -       -      +
     65B  PHE*     3.2     9.4    -      -       +      +
     66B  PHE*     3.1    58.7    +      -       +      -
     68B  ILE*     6.0     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 63 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  ALA      3.5    11.9    +      -       -      +
     60B  ALA*     3.7     8.7    -      -       -      +
     61B  TYR      3.2     0.2    -      -       -      -
     62B  LEU*     1.3    78.3    -      -       -      +
     64B  MET*     1.3    60.3    +      -       -      +
     66B  PHE      3.2     2.3    +      -       -      -
     67B  GLY      3.0     4.2    +      -       -      -
     68B  ILE*     2.7    57.9    +      -       +      +
     69B  GLY      4.9     1.8    -      -       -      +
     86B  ALA*     4.3    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 64 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11B  ARG*     2.7    32.4    +      -       -      -
     17B  LEU*     3.1    29.8    -      -       +      +
     60B  ALA*     3.0    21.8    +      -       +      +
     61B  TYR*     3.4    46.2    -      -       +      +
     63B  ALA*     1.3    75.7    -      -       -      +
     65B  PHE*     1.3    51.7    +      -       -      +
     67B  GLY*     3.0     3.5    +      -       -      -
     68B  ILE      4.7     0.7    -      -       -      +
     69B  GLY      5.4     1.3    -      -       -      +
     84B  TYR*     3.8    30.4    -      -       +      -
     86B  ALA*     3.6    15.3    -      -       +      -
     87B  ARG*     3.8    42.0    -      -       +      +
     90B  ASP*     5.3     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 65 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  LEU*     3.9    20.4    -      -       +      -
      7B  LEU*     3.2    45.4    -      -       +      +
     11B  ARG*     3.2    11.4    +      -       -      -
     14B  THR*     3.3    40.2    -      -       -      +
     17B  LEU*     3.8     8.7    -      -       +      -
     18B  GLY*     3.9    17.0    -      -       -      -
     21B  THR*     4.5     3.8    -      -       -      +
     61B  TYR      2.8    19.4    +      -       -      +
     62B  LEU*     3.2    13.9    -      -       +      +
     63B  ALA      3.1     0.2    -      -       -      -
     64B  MET*     1.3    72.4    -      -       -      +
     66B  PHE*     1.3    84.2    +      +       -      +
     67B  GLY      2.9     7.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 66 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7B  LEU*     3.9    19.3    -      -       +      +
     11B  ARG*     4.1     3.7    +      -       -      -
     62B  LEU*     3.1    53.9    +      -       +      -
     65B  PHE*     1.3    96.3    -      +       -      +
     67B  GLY*     1.3    63.5    +      -       -      +
     68B  ILE*     3.2    28.3    +      -       +      +
----------------------------------------------------------
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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