Contacts of the helix formed by residues 1 - 30 (chain F) in PDB entry 1VF5


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 MET 1 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33C  GLU*     3.3    34.8    +      -       +      +
     34C  VAL      3.7    20.6    -      -       -      +
     35C  GLU*     3.6    14.4    -      -       +      +
     36C  VAL      5.4     5.4    -      -       -      +
    243C  ASP*     4.7    14.4    -      -       -      +
    244C  ASP      5.4     3.1    -      -       -      +
    245C  THR*     4.3    18.6    -      -       -      +
      2F  THR*     1.3    70.3    +      -       -      +
      3F  GLU*     3.4     3.4    -      -       -      +
      4F  GLU*     2.8    52.2    +      -       -      +
      5F  MET*     4.5     2.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 2 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1F  MET*     1.3    75.2    -      -       -      +
      3F  GLU*     1.3    69.1    +      -       +      +
      4F  GLU      2.7    17.5    +      -       -      -
      5F  MET*     2.8    37.9    +      -       -      +
      6F  LEU*     3.0    39.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 3 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1F  MET*     3.4     2.1    -      -       -      -
      2F  THR*     1.3    84.6    -      -       +      +
      4F  GLU*     1.3    59.2    +      -       +      +
      5F  MET      3.4     0.2    -      -       -      -
      6F  LEU*     3.5    26.1    -      -       +      +
      7F  TYR*     3.3    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 4 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35C  GLU*     5.1     0.7    -      -       -      +
     38C  GLN*     6.0     2.4    -      -       -      +
      1E  MET      6.0     1.1    -      -       -      +
      2E  ILE*     4.2    12.6    -      -       +      +
      1F  MET*     2.8    57.5    -      -       -      +
      2F  THR      2.7     6.7    +      -       -      -
      3F  GLU*     1.3    77.0    -      -       +      +
      5F  MET*     1.3    56.5    +      -       +      +
      7F  TYR*     4.0    19.1    -      -       +      -
      8F  ALA*     3.1    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 5 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1E  MET      3.6    35.9    -      -       -      +
      2E  ILE      3.9     1.1    -      -       -      +
      4E  GLY*     4.9     1.8    -      -       -      -
      5E  ALA*     2.8    32.7    -      -       +      +
      8E  TYR*     3.9    24.0    -      -       +      -
      1F  MET      5.3     2.0    -      -       -      +
      2F  THR*     2.8    31.0    +      -       -      +
      4F  GLU*     1.3    75.2    -      -       -      +
      6F  LEU*     1.3    67.0    +      -       +      +
      7F  TYR      3.0     2.5    -      -       -      -
      8F  ALA*     2.7     8.8    +      -       -      -
      9F  ALA      2.5    33.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 6 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2F  THR*     3.0    38.1    +      -       +      +
      3F  GLU*     3.5    30.7    -      -       +      -
      4F  GLU      3.6     0.2    -      -       -      -
      5F  MET*     1.3    89.2    -      -       +      +
      7F  TYR*     1.3    57.8    +      -       -      +
      9F  ALA*     3.8     3.0    +      -       -      +
     10F  LEU*     2.8    34.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 7 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2E  ILE*     6.2     0.7    -      -       +      -
      3F  GLU      3.3    22.8    +      -       -      +
      4F  GLU*     4.0    19.3    -      -       +      -
      5F  MET      3.0     0.2    -      -       -      -
      6F  LEU*     1.3    77.5    -      -       -      +
      8F  ALA*     1.3    73.7    +      -       +      +
      9F  ALA      3.1     1.2    +      -       -      -
     10F  LEU*     3.4     9.9    +      -       +      +
     11F  LEU*     2.8    48.8    +      -       +      +
     15G  PHE*     5.8     7.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 8 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2E  ILE*     3.2    32.1    -      -       +      +
      5E  ALA*     4.2     2.2    -      -       +      -
      6E  VAL*     4.4     6.7    -      -       +      +
      4F  GLU      3.1    20.4    -      -       -      +
      5F  MET*     2.7    12.0    +      -       -      +
      7F  TYR*     1.3    92.5    -      -       +      +
      9F  ALA*     1.3    55.3    +      -       -      -
     11F  LEU*     3.9    12.1    -      -       -      +
     12F  SER*     3.2    17.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 9 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5E  ALA*     3.2    37.7    -      -       +      +
      8E  TYR*     5.2     2.0    -      -       +      -
      9E  ILE*     2.6    37.2    -      -       +      +
      5F  MET      2.5    11.1    +      -       -      +
      6F  LEU*     4.1     5.6    -      -       -      +
      8F  ALA*     1.3    71.3    -      -       -      +
     10F  LEU*     1.3    72.5    +      -       +      +
     11F  LEU      2.9     2.8    +      -       -      -
     12F  SER      3.0     5.7    +      -       -      -
     13F  PHE      3.4     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 10 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9E  ILE*     5.0     6.7    -      -       +      -
      6F  LEU*     2.8    26.2    -      -       +      +
      7F  TYR*     3.4     9.2    +      -       +      +
      9F  ALA*     1.3    79.5    -      -       +      +
     11F  LEU*     1.3    62.5    +      -       +      +
     13F  PHE*     3.5     6.5    +      -       -      +
     14F  GLY*     3.1    21.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 11 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7F  TYR*     2.8    49.5    +      -       +      +
      8F  ALA*     3.9     9.4    -      -       -      +
      9F  ALA      2.9     0.8    +      -       -      -
     10F  LEU*     1.3    76.1    -      -       +      +
     12F  SER*     1.3    61.4    +      -       -      +
     15F  LEU*     2.9    52.2    +      -       +      +
     19G  GLY*     6.3     2.0    -      -       -      -
      5H  VAL*     4.1    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 12 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6E  VAL*     3.4    26.1    +      -       -      +
      9E  ILE*     3.3    16.6    -      -       -      +
     10E  VAL*     4.1    15.0    -      -       -      -
      8F  ALA      3.2    16.6    +      -       -      -
      9F  ALA      3.0     1.4    +      -       -      -
     11F  LEU*     1.3    75.9    -      -       -      +
     13F  PHE*     1.3    67.0    +      -       -      +
     15F  LEU*     4.1     1.4    -      -       -      +
     16F  ILE*     3.0    26.6    +      -       -      +
     22G  PHE*     4.1    11.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 13 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9E  ILE*     3.4    30.4    -      -       +      +
     12E  ILE*     3.6    18.2    -      -       +      -
     13E  ALA*     3.4    39.9    -      -       +      -
     16E  PHE*     4.4    24.9    -      +       -      -
    101E  BCR      4.5     0.2    -      -       +      -
      9F  ALA      3.4     1.8    +      -       -      -
     10F  LEU*     3.7     8.5    -      -       -      +
     12F  SER*     1.3    77.2    -      -       -      +
     14F  GLY*     1.3    67.4    +      -       -      +
     16F  ILE*     2.9    24.1    +      -       -      +
     17F  PHE*     3.0    41.9    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLY 14 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10F  LEU      3.1    12.3    +      -       -      -
     13F  PHE*     1.3    82.6    -      -       -      +
     15F  LEU*     1.3    54.5    +      -       -      +
     17F  PHE*     2.6    37.4    +      -       -      +
     18F  VAL*     3.1    15.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 15 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11F  LEU*     2.9    47.4    +      -       +      +
     12F  SER      4.1     0.9    -      -       -      +
     14F  GLY*     1.3    73.1    -      -       -      +
     16F  ILE*     1.3    53.3    +      -       -      +
     18F  VAL*     3.1    19.5    +      -       +      +
     19F  GLY*     2.7    32.7    +      -       -      -
     19G  GLY*     3.5    22.4    -      -       -      +
     22G  PHE*     3.8    22.2    -      -       +      -
     26G  TYR*     3.0    30.3    +      -       +      +
      5H  VAL*     6.1     1.3    -      -       +      -
      9H  VAL*     5.2     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 16 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10E  VAL*     5.5     2.9    -      -       +      -
     13E  ALA*     4.1    13.5    -      -       +      -
    101E  BCR      3.4    65.3    -      -       +      -
     12F  SER      3.0    24.2    -      -       -      +
     13F  PHE      2.9    13.9    +      -       -      +
     14F  GLY      2.7     4.6    +      -       -      -
     15F  LEU*     1.3    76.2    -      -       -      +
     17F  PHE*     1.3    55.3    +      -       +      +
     19F  GLY*     3.3     1.0    +      -       -      -
     20F  TRP*     2.7    35.6    +      -       +      +
     22G  PHE*     3.9    22.4    -      -       +      -
     29G  TYR*     4.0    16.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 17 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13E  ALA*     4.9     1.1    -      -       +      -
    101E  BCR      3.3    53.2    -      -       +      -
     13F  PHE*     3.0    58.6    -      +       -      -
     14F  GLY*     2.6    17.3    +      -       -      +
     16F  ILE*     1.3    76.5    -      -       +      +
     18F  VAL*     1.3    57.0    +      -       +      +
     20F  TRP*     3.6    22.0    -      +       +      +
     21F  GLY*     2.7    30.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 18 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14F  GLY      3.1    14.3    +      -       -      +
     15F  LEU*     3.4    27.8    -      -       +      +
     17F  PHE*     1.3    77.8    -      -       +      +
     19F  GLY*     1.3    63.1    +      -       -      +
     21F  GLY*     3.3     2.2    +      -       -      -
     22F  LEU*     3.1    42.1    +      -       +      +
     26G  TYR*     4.9     4.0    -      -       +      -
     13H  VAL*     6.0     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 19 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15F  LEU      2.7    11.5    +      -       -      -
     18F  VAL*     1.3    75.5    -      -       -      +
     20F  TRP*     1.3    65.2    +      -       -      +
     22F  LEU*     3.1     4.9    +      -       -      +
     23F  GLY      3.0    18.0    +      -       -      -
     26G  TYR*     3.4    28.3    -      -       -      -
     29G  TYR*     3.0    26.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 20 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101E  BCR      3.5    63.0    -      -       +      -
     16F  ILE*     2.7    24.0    +      -       +      +
     17F  PHE*     3.6    26.7    -      +       +      +
     19F  GLY*     1.3    70.6    -      -       -      +
     21F  GLY*     1.3    64.8    +      -       -      +
     23F  GLY*     2.9     3.8    +      -       -      -
     24F  VAL*     2.9    43.0    +      -       +      +
     29G  TYR*     3.3    21.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 21 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17F  PHE      2.7    22.1    +      -       -      -
     18F  VAL*     3.6     2.2    -      -       -      -
     19F  GLY      3.1     0.2    -      -       -      -
     20F  TRP*     1.3    73.5    -      -       -      +
     22F  LEU*     1.3    53.0    +      -       -      +
     24F  VAL*     2.9    11.4    +      -       -      +
     25F  LEU*     2.7    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 22 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18F  VAL*     3.1    23.8    +      -       +      +
     19F  GLY      3.1     4.5    +      -       -      +
     21F  GLY*     1.3    73.1    -      -       -      +
     23F  GLY*     1.3    51.0    +      -       -      +
     25F  LEU*     3.9    21.3    -      -       +      -
     26F  LEU*     2.7    50.5    +      -       +      +
     23G  TYR*     5.6     2.7    -      -       +      -
     26G  TYR*     3.8    31.6    -      -       +      +
     13H  VAL*     4.0    23.8    -      -       +      -
     17H  TRP*     5.0    17.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 23 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19F  GLY      3.0     8.2    +      -       -      -
     20F  TRP      2.9     8.4    +      -       -      -
     22F  LEU*     1.3    74.4    -      -       -      +
     24F  VAL*     1.3    65.7    +      -       -      +
     26F  LEU*     2.9     6.7    +      -       -      +
     27F  LEU*     2.9    25.6    +      -       -      +
     26G  TYR      3.9     9.3    +      -       -      -
     29G  TYR      3.7    27.6    -      -       -      -
     30G  LYS*     3.9     3.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 24 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20F  TRP*     2.9    41.2    +      -       +      +
     21F  GLY*     2.9     6.9    +      -       -      +
     23F  GLY*     1.3    72.9    -      -       -      +
     25F  LEU*     1.3    65.8    +      -       -      +
     27F  LEU*     2.9    14.8    +      -       +      +
     28F  LYS*     2.8    42.1    +      -       +      +
     29G  TYR      4.3     2.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 25 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21F  GLY      2.7    19.6    +      -       -      +
     22F  LEU*     3.8    21.1    -      -       +      +
     24F  VAL*     1.3    73.8    -      -       -      +
     26F  LEU*     1.3    61.1    +      -       -      +
     28F  LYS*     3.4    20.2    +      -       +      +
     29F  ILE*     3.2    33.6    +      -       +      +
     17H  TRP*     3.8    35.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 26 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22F  LEU*     2.7    37.0    +      -       +      +
     23F  GLY*     2.9     5.6    +      -       -      +
     25F  LEU*     1.3    71.5    -      -       +      +
     27F  LEU*     1.3    67.7    +      -       -      +
     29F  ILE*     3.0    34.0    +      -       +      +
     30F  GLN*     3.4     8.8    -      -       -      +
     26G  TYR      6.0     1.1    -      -       -      +
     27G  GLN*     5.7     4.9    -      -       -      +
     30G  LYS*     3.3    43.1    -      -       +      +
     17H  TRP*     2.9    38.4    -      -       +      +
     20H  ALA*     5.0    11.4    -      -       +      -
     21H  MET*     5.1     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 27 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277C  LYS*     4.8     2.0    -      -       -      +
    278C  GLN*     3.8     4.3    -      -       -      +
     23F  GLY      2.9    15.5    +      -       -      +
     24F  VAL*     3.4    12.1    -      -       +      +
     26F  LEU*     1.3    75.5    -      -       -      +
     28F  LYS*     1.3    53.2    +      -       -      +
     30F  GLN*     2.8    30.2    +      -       -      +
     31F  GLY*     2.7    37.1    +      -       -      +
     32F  ALA*     3.9    23.1    -      -       +      -
     29G  TYR      4.7     1.6    -      -       -      +
     30G  LYS*     3.2    27.1    -      -       +      +
     31G  ARG*     3.8    30.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 28 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24F  VAL*     2.8    27.2    +      -       +      +
     25F  LEU*     3.5    30.8    -      -       +      +
     27F  LEU*     1.3    76.9    -      -       -      +
     29F  ILE*     1.3    60.3    +      -       +      +
     30F  GLN      3.1     4.7    +      -       -      -
     31F  GLY*     3.8     6.4    +      -       -      +
     32F  ALA*     4.5    13.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 29 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25F  LEU*     3.2    33.6    +      -       +      +
     26F  LEU*     3.0    36.6    -      -       +      +
     28F  LYS*     1.3    76.0    -      -       +      +
     30F  GLN*     1.3    59.0    +      -       +      +
     17H  TRP*     4.1    13.2    -      -       +      -
     21H  MET*     4.3    15.5    -      -       +      -
     24H  TRP*     4.9    17.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 30 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278C  GLN*     2.2    55.7    +      -       -      +
    280C  GLU*     5.6     0.6    +      -       -      -
     26F  LEU      3.4    12.1    -      -       -      +
     27F  LEU*     2.8    32.5    +      -       -      +
     28F  LYS      3.0     1.6    +      -       -      -
     29F  ILE*     1.3    77.9    -      -       +      +
     31F  GLY*     1.3    67.0    +      -       -      +
     30G  LYS*     4.6     2.7    -      -       -      -
     24H  TRP*     5.2    13.5    -      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il