Contacts of the helix formed by residues 40 - 66 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  VAL      3.5     1.0    -      -       -      -
     39A  THR*     1.3    69.8    -      -       -      +
     41A  LYS*     1.3    67.3    +      -       -      +
     42A  GLU*     3.6     6.1    +      -       -      +
     43A  ALA*     3.0    37.6    +      -       +      +
     44A  ARG*     3.0    22.7    +      -       -      +
    234A  ILE      3.6     1.0    -      -       -      +
    235A  LEU*     4.0     2.9    -      -       -      -
    236A  GLY*     3.2    27.8    +      -       -      -
     39B  THR*     3.7     4.9    -      -       -      -
     40B  ASP*     2.6    37.7    +      -       -      +
    237B  GLU*     2.7    28.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 41 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  THR      2.7     4.9    +      -       -      -
     40A  ASP*     1.3    69.4    +      -       -      +
     42A  GLU*     1.3    65.1    +      -       -      +
     44A  ARG*     2.9    25.2    +      -       -      +
     45A  GLU*     3.4     6.2    +      -       -      +
    237A  GLU*     3.5    30.7    +      -       -      +
     37B  GLY      5.4     5.4    +      -       -      -
     39B  THR*     2.7    33.0    +      -       +      +
    311B  BNG      4.7    15.6    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     40A  ASP*     3.4     6.3    +      -       -      +
     41A  LYS*     1.3    80.4    -      -       +      +
     43A  ALA*     1.3    62.0    +      -       -      +
     45A  GLU*     3.2    27.4    +      -       -      +
     46A  TYR*     3.3    37.4    +      -       -      -
    104A  LEU*     5.4     2.3    -      -       -      +
    107A  LYS*     3.1    30.6    +      -       -      -
    168A  ARG*     4.9     3.8    +      -       -      -
    233A  ALA      5.2     1.2    -      -       -      +
    234A  ILE      3.7     4.9    -      -       -      +
    235A  LEU      4.5     0.5    -      -       -      +
    236A  GLY      2.5    31.3    -      -       -      +
    237A  GLU*     3.2    35.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 43 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  VAL*     3.8    11.9    -      -       +      -
     40A  ASP*     3.0    31.2    +      -       +      +
     42A  GLU*     1.3    76.7    -      -       -      +
     44A  ARG*     1.3    61.8    +      -       -      +
     45A  GLU      3.3     0.2    +      -       -      -
     46A  TYR*     3.3     6.3    +      -       -      +
     47A  TYR*     3.1    30.7    +      -       +      -
    234A  ILE*     3.1    34.7    +      -       +      +
    235A  LEU*     4.2     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 44 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  GLY      3.1    22.1    +      -       -      +
     36A  TRP*     3.3    28.7    +      -       -      +
     38A  VAL*     2.7    42.5    +      -       +      +
     39A  THR*     4.4     8.5    -      -       -      +
     40A  ASP      3.0    16.3    +      -       -      +
     41A  LYS*     2.9    14.1    +      -       -      +
     43A  ALA*     1.3    75.9    -      -       -      +
     45A  GLU*     1.3    61.6    +      -       -      +
     47A  TYR*     3.8     9.6    -      -       -      +
     48A  ALA*     3.2    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 45 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  LYS      3.4     4.5    +      -       -      +
     42A  GLU*     3.2    25.4    +      -       -      +
     43A  ALA      3.1     0.6    -      -       -      -
     44A  ARG*     1.3    78.7    -      -       -      +
     46A  TYR*     1.3    66.9    +      -       -      +
     48A  ALA*     3.3     6.8    +      -       +      +
     49A  ILE*     3.1    39.5    +      -       +      +
    104A  LEU*     4.0    27.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 46 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42A  GLU*     3.3    39.6    +      -       -      -
     43A  ALA      3.3     6.1    +      -       -      +
     45A  GLU*     1.3    78.5    -      -       +      +
     47A  TYR*     1.3    60.2    +      -       -      +
     49A  ILE*     3.4     3.2    +      -       -      +
     50A  THR*     2.5    33.4    +      -       -      -
    101A  ASP*     3.5    30.5    -      -       -      +
    104A  LEU*     3.3    34.4    +      -       +      +
    105A  LEU*     3.2    41.9    +      -       +      +
    107A  LYS*     4.1     6.2    +      -       -      -
    168A  ARG*     4.3     3.3    +      -       -      -
    228A  LEU*     4.3     6.5    -      -       +      -
    229A  LEU*     4.2     8.5    -      -       +      -
    233A  ALA      4.6     1.3    +      -       -      -
    234A  ILE*     3.4    43.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 47 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  PHE*     3.4    20.2    -      -       -      -
     34A  ARG*     3.1    33.6    +      -       +      +
     35A  GLY*     3.5    31.0    -      -       -      +
     38A  VAL*     4.2    19.1    -      -       +      +
     43A  ALA*     3.1    28.0    +      -       +      +
     44A  ARG*     3.8     9.2    -      -       -      +
     46A  TYR*     1.3    79.8    -      -       -      +
     48A  ALA*     1.3    57.3    +      -       -      +
     50A  THR*     3.3     1.1    +      -       -      -
     51A  ILE*     2.9    42.6    +      -       +      +
    229A  LEU*     3.2    44.4    +      -       +      -
    234A  ILE*     3.7    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 48 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  ARG      3.2    15.7    +      -       -      +
     45A  GLU*     3.3     8.0    +      -       +      +
     47A  TYR*     1.3    80.0    -      -       -      +
     49A  ILE*     1.3    63.1    +      -       +      +
     51A  ILE*     3.7     9.2    +      -       -      +
     52A  LEU*     3.4    28.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 49 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  GLU*     3.1    26.9    +      -       +      +
     46A  TYR      3.7     3.4    -      -       -      +
     48A  ALA*     1.3    78.8    -      -       +      +
     50A  THR*     1.3    62.8    +      -       -      +
     52A  LEU*     3.6    17.5    +      -       -      +
     53A  VAL*     3.6    11.3    -      -       +      +
     97A  LEU*     3.4    42.7    -      -       +      +
    100A  LEU*     3.7    24.0    -      -       +      -
    101A  ASP*     3.5    15.9    -      -       -      +
    104A  LEU*     3.6    31.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 50 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  PHE*     4.1     5.6    -      -       +      -
     46A  TYR      2.5    24.2    +      -       -      -
     47A  TYR      3.8     2.5    -      -       -      -
     49A  ILE*     1.3    73.4    -      -       -      +
     51A  ILE*     1.3    60.6    +      -       -      +
     52A  LEU      3.1     2.5    -      -       -      -
     53A  VAL*     2.9    13.1    +      -       +      +
     54A  PRO*     2.9    27.5    -      -       -      +
     98A  LEU*     5.9     1.6    -      -       +      -
    101A  ASP*     3.1    21.1    +      -       -      +
    221A  LYS      4.9     2.5    -      -       -      +
    224A  PHE*     5.8     1.3    -      -       +      -
    225A  GLY*     3.7    22.9    -      -       -      -
    228A  LEU*     3.7     8.3    -      -       +      +
    229A  LEU*     3.6    27.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 51 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  THR*     3.5    18.5    -      -       +      +
     31A  PHE*     3.9    28.3    -      -       +      +
     32A  ILE*     3.6    44.9    -      -       +      -
     35A  GLY*     5.9     1.3    -      -       -      -
     47A  TYR*     2.9    38.3    +      -       +      +
     48A  ALA*     3.9     8.5    -      -       -      +
     50A  THR*     1.3    75.8    -      -       -      +
     52A  LEU*     1.3    63.0    +      -       +      +
     53A  VAL      3.3     0.2    +      -       -      -
     54A  PRO*     3.6     3.1    -      -       -      +
     55A  GLY*     3.1    21.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 52 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ALA*     3.4    18.4    +      -       +      +
     49A  ILE*     3.6    12.9    +      -       -      +
     50A  THR      3.1     0.8    -      -       -      -
     51A  ILE*     1.3    80.6    -      -       +      +
     53A  VAL*     1.3    66.3    +      -       -      +
     55A  GLY*     3.7     4.5    -      -       -      +
     56A  ILE*     3.0    36.4    +      -       +      +
     97A  LEU*     3.9    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 53 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  ILE      3.6    16.4    -      -       -      +
     50A  THR*     2.9    14.2    +      -       +      +
     52A  LEU*     1.3    81.4    -      -       -      +
     54A  PRO*     1.3    69.0    -      -       +      +
     57A  ALA*     3.1    19.7    +      -       -      +
     94A  THR*     3.5    27.3    +      -       +      +
     97A  LEU*     3.8    22.2    -      -       +      -
     98A  LEU*     3.9    26.5    -      -       +      +
    101A  ASP*     5.3     0.9    -      -       -      +
    221A  LYS*     3.4    33.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 54 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  MET*     3.3    23.4    -      -       +      +
     28A  THR*     3.1    19.3    -      -       -      +
     31A  PHE*     4.0    26.2    -      -       +      -
     50A  THR      2.9    24.2    -      -       -      +
     51A  ILE      3.6     5.4    -      -       -      +
     53A  VAL*     1.3    86.0    -      -       +      +
     55A  GLY*     1.3    57.7    +      -       -      +
     57A  ALA*     3.7     2.0    -      -       +      -
     58A  SER*     2.8    33.3    +      -       -      -
    221A  LYS*     4.6     7.4    -      -       +      +
    222A  VAL*     4.1    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 55 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  THR*     3.2    18.9    +      -       -      -
     51A  ILE      3.1    17.5    +      -       -      -
     52A  LEU*     4.0     3.4    -      -       -      -
     53A  VAL      3.1     1.6    -      -       -      -
     54A  PRO*     1.3    76.7    -      -       -      +
     56A  ILE*     1.3    60.7    -      -       -      +
     58A  SER*     3.2    19.3    +      -       -      -
     59A  ALA*     3.4     7.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 56 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  LEU*     3.0    36.2    +      -       +      +
     53A  VAL      4.0     1.3    -      -       -      +
     55A  GLY*     1.3    75.1    -      -       -      +
     57A  ALA*     1.3    63.3    +      -       -      +
     59A  ALA*     3.4     8.4    +      -       +      +
     60A  ALA*     3.0    20.3    +      -       +      +
     89A  ALA      5.2     0.7    -      -       -      +
     90A  ASP*     4.4    17.5    -      -       -      +
     93A  PHE*     4.1    22.4    -      -       +      -
     94A  THR*     4.1    12.6    -      -       -      +
     97A  LEU*     4.0    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 57 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  MET*     3.3    36.6    -      -       +      -
     53A  VAL      3.1    16.8    +      -       -      +
     54A  PRO      3.6     0.2    -      -       -      +
     56A  ILE*     1.3    76.9    -      -       -      +
     58A  SER*     1.3    54.6    +      -       -      +
     60A  ALA*     3.2     0.9    +      -       -      +
     61A  TYR*     2.7    40.2    +      -       +      +
     90A  ASP*     3.7    16.6    +      -       -      +
    221A  LYS*     3.7    15.7    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
     21A  THR*     3.9     6.7    -      -       -      +
     24A  MET*     3.0    33.7    +      -       -      +
     25A  LEU*     3.0    29.5    +      -       -      +
     28A  THR*     3.7     1.6    +      -       -      -
     54A  PRO      2.8    19.0    +      -       -      -
     55A  GLY*     3.2    12.8    +      -       -      -
     57A  ALA*     1.3    75.6    -      -       -      +
     59A  ALA*     1.3    57.2    +      -       -      +
     61A  TYR*     3.2     5.8    +      -       -      +
     62A  LEU*     2.9    29.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 59 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  GLY      3.4     7.4    +      -       -      +
     56A  ILE*     3.7    10.1    -      -       +      +
     57A  ALA      3.3     0.4    -      -       -      -
     58A  SER*     1.3    76.2    -      -       -      +
     60A  ALA*     1.3    61.3    +      -       -      +
     62A  LEU*     3.1     9.8    +      -       -      +
     63A  ALA*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  ILE*     3.0    18.3    +      -       +      +
     57A  ALA      3.6     4.3    -      -       -      +
     59A  ALA*     1.3    75.2    -      -       -      +
     61A  TYR*     1.3    58.6    +      -       -      +
     63A  ALA*     3.5     7.0    +      -       -      +
     64A  MET*     3.1    37.0    +      -       +      +
     86A  ALA*     3.7    15.8    -      -       +      +
     89A  ALA*     6.1     0.2    -      -       +      -
     90A  ASP*     3.6    32.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  LEU*     3.5    44.4    -      -       +      +
     20A  GLY*     3.8    22.2    -      -       -      +
     21A  THR*     3.2    24.2    +      -       -      +
     24A  MET*     4.2    19.1    -      -       +      -
     57A  ALA      2.7    30.0    +      -       -      +
     58A  SER      3.6     3.6    -      -       -      +
     60A  ALA*     1.3    73.5    -      -       -      +
     62A  LEU*     1.3    63.3    +      -       -      +
     64A  MET*     3.7    21.0    +      -       +      +
     65A  PHE*     3.1    18.0    +      -       -      +
     87A  ARG*     5.6     2.3    +      -       -      -
     90A  ASP*     4.4     8.7    -      -       -      -
    210A  THR      5.2     0.4    +      -       -      -
    213A  PHE*     3.7     2.9    +      -       -      +
    214A  MET*     3.3    30.8    +      -       +      -
    217A  ASP*     2.8    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 62 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  THR*     3.8    21.3    +      -       +      +
     25A  LEU*     6.2     0.7    -      -       +      -
     58A  SER      2.9    13.4    +      -       -      +
     59A  ALA*     3.1    11.4    +      -       -      +
     61A  TYR*     1.3    73.7    -      -       -      +
     63A  ALA*     1.3    67.0    +      -       -      +
     65A  PHE*     3.1    18.6    +      -       +      +
     66A  PHE*     3.2    47.2    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 63 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  ALA      2.9    14.9    +      -       -      +
     60A  ALA*     3.7     7.0    -      -       -      +
     62A  LEU*     1.3    77.2    -      -       -      +
     64A  MET*     1.3    61.9    +      -       -      +
     65A  PHE      3.2     0.3    +      -       -      -
     66A  PHE*     3.2     3.1    +      -       -      -
     67A  GLY      3.2     3.5    +      -       -      -
     68A  ILE*     2.8    56.8    +      -       +      +
     86A  ALA*     4.4    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 64 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11A  ARG*     2.8    26.9    +      -       -      -
     17A  LEU*     3.6    23.5    -      -       +      +
     60A  ALA*     3.1    23.1    +      -       +      +
     61A  TYR*     3.9    39.5    -      -       +      +
     63A  ALA*     1.3    76.8    -      -       -      +
     65A  PHE*     1.3    58.6    +      -       -      +
     67A  GLY      3.1     2.6    +      -       -      +
     68A  ILE      4.6     2.2    -      -       -      -
     84A  TYR*     3.6    43.4    -      -       +      -
     86A  ALA*     3.7    14.4    -      -       +      -
     87A  ARG*     4.0    34.5    -      -       +      +
     90A  ASP*     5.3     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 65 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  LEU*     3.5    24.7    -      -       +      -
      7A  LEU*     3.1    48.1    -      -       +      +
     11A  ARG*     3.6     7.3    +      -       -      -
     14A  THR*     3.4    28.6    -      -       -      +
     17A  LEU*     4.3     8.9    -      -       +      +
     18A  GLY*     3.8    18.2    -      -       -      -
     21A  THR*     4.6     3.8    -      -       -      +
     61A  TYR      3.1    15.2    +      -       -      +
     62A  LEU*     3.1    17.3    +      -       +      +
     64A  MET*     1.3    79.0    -      -       -      +
     66A  PHE*     1.3    91.5    +      +       -      +
     67A  GLY      3.0     3.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 66 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  LEU*     3.9    16.3    -      -       +      +
     11A  ARG*     4.7     0.4    -      -       -      -
     62A  LEU*     3.2    49.4    +      -       +      +
     63A  ALA      3.2     2.7    +      -       -      +
     65A  PHE*     1.3   103.1    -      +       -      +
     67A  GLY*     1.3    63.1    +      -       -      +
     68A  ILE*     3.2    22.7    +      -       +      +
----------------------------------------------------------
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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