Contacts of the helix formed by residues 76 - 99 (chain Q) in PDB entry 5FLX


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 GLY 76 (chain Q).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   15441    C      2.7    18.7    +      -       -      -
   16721    U      4.0     4.7    -      -       -      -
   16731    U      3.7    15.7    -      -       -      -
     75Q  GLY*     1.3    77.9    -      -       -      +
     77Q  HIS*     1.3    66.0    +      -       -      -
     78Q  VAL      3.3     2.0    -      -       -      -
     79Q  ALA*     3.7     7.8    -      -       -      +
     80Q  GLN*     3.1    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 77 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   15421    C      5.9     0.2    -      -       -      -
   15431    U      3.0    47.3    +      -       +      -
   15441    C      3.2    23.6    +      +       -      -
   15891    A      4.7     0.7    -      -       -      -
   15901    C      2.9    35.8    +      -       -      -
   15911    C      4.2    15.5    +      -       -      -
   16721    U      4.8     2.1    +      -       -      -
   16731    U      4.0     7.9    +      -       -      -
     43Q  GLU*     3.6    12.1    +      -       -      +
     44Q  PRO*     5.7     7.3    -      -       +      +
     47Q  LEU*     4.5     7.7    -      -       +      +
     76Q  GLY*     1.3    73.7    -      -       -      +
     78Q  VAL*     1.3    64.3    +      -       +      +
     80Q  GLN*     3.6    12.4    +      -       -      +
     81Q  ILE*     3.3    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 78 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   16731    U      3.6    30.1    +      -       -      +
   16741    G      3.8    19.7    -      -       -      +
     51F  HIS*     3.4    33.9    -      -       +      +
     87F  LEU*     5.2     7.2    -      -       +      -
     16Q  LYS*     4.8     8.5    -      -       -      +
     47Q  LEU*     4.2    15.5    -      -       +      -
     76Q  GLY      3.3     0.2    -      -       -      -
     77Q  HIS*     1.3    76.2    -      -       +      +
     79Q  ALA*     1.3    66.1    +      -       -      +
     81Q  ILE*     3.2    15.1    +      -       -      +
     82Q  TYR*     3.3    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 79 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   16721    U      5.8     1.3    -      -       -      +
   16731    U      3.7     6.6    +      -       -      +
     16Q  LYS*     3.9    17.3    -      -       +      +
     17Q  LYS*     6.1     2.0    -      -       +      -
     18Q  THR      3.3    27.6    -      -       -      +
     19Q  ALA*     3.6    11.7    -      -       +      +
     75Q  GLY      4.9     0.9    -      -       -      +
     76Q  GLY*     3.4    17.6    +      -       -      +
     77Q  HIS      3.3     0.6    -      -       -      -
     78Q  VAL*     1.3    80.5    -      -       -      +
     80Q  GLN*     1.3    56.9    +      -       -      +
     82Q  TYR      3.6     0.3    +      -       -      -
     83Q  ALA*     2.9    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 80 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   15431    U      4.3     2.6    +      -       -      -
   15441    C      3.4    41.9    +      -       -      +
     43Q  GLU*     3.5    28.7    +      -       -      +
     72Q  VAL*     3.5    41.8    +      -       +      -
     74Q  GLY      3.8     7.1    +      -       -      +
     76Q  GLY      3.1    18.1    +      -       -      +
     77Q  HIS*     3.9     7.1    -      -       -      +
     78Q  VAL      3.3     0.2    -      -       -      -
     79Q  ALA*     1.3    77.3    -      -       -      +
     81Q  ILE*     1.3    60.2    +      -       +      +
     83Q  ALA*     3.6     0.3    -      -       -      +
     84Q  ILE*     2.9    43.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 81 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42Q  ILE*     3.6    31.4    -      -       +      -
     43Q  GLU*     6.5     0.4    -      -       -      -
     44Q  PRO*     5.0     3.4    -      -       +      -
     47Q  LEU*     4.0    33.2    -      -       +      +
     50Q  LYS*     5.1     7.9    -      -       +      -
     51Q  LEU*     3.3    40.7    -      -       +      +
     77Q  HIS      3.3    18.4    -      -       -      +
     78Q  VAL*     3.2     8.0    +      -       -      +
     80Q  GLN*     1.3    81.1    -      -       +      +
     82Q  TYR*     1.3    69.1    +      -       +      +
     84Q  ILE*     3.2     3.0    +      -       +      -
     85Q  ARG*     2.9    26.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 82 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51F  HIS*     2.8    42.5    +      +       -      -
     52F  SER*     3.4    13.7    -      -       -      -
     53F  ALA*     5.0     4.7    -      -       +      -
     16Q  LYS*     3.6    42.6    -      -       +      -
     47Q  LEU*     5.7     2.5    -      -       +      -
     50Q  LYS*     3.8    29.4    -      -       +      +
     78Q  VAL*     3.3    41.3    +      -       +      -
     81Q  ILE*     1.3    80.4    -      -       +      +
     83Q  ALA*     1.3    61.6    +      -       -      +
     85Q  ARG*     3.9    21.7    -      -       -      +
     86Q  GLN*     2.9    34.4    +      -       -      +
    118Q  THR*     6.1     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 83 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14Q  GLY*     4.6    10.0    -      -       -      -
     16Q  LYS*     4.6     4.4    -      -       +      +
     19Q  ALA*     3.8    18.2    -      -       +      -
     20Q  THR      4.7     1.8    -      -       -      -
     21Q  ALA*     3.6    20.0    -      -       +      +
     72Q  VAL*     4.3     5.8    -      -       +      -
     79Q  ALA      2.9    21.7    +      -       -      +
     80Q  GLN*     3.6     7.4    -      -       -      +
     81Q  ILE      3.2     0.2    -      -       -      -
     82Q  TYR*     1.3    75.1    -      -       -      +
     84Q  ILE*     1.3    59.8    +      -       -      +
     86Q  GLN*     4.1     2.3    -      -       -      +
     87Q  SER*     2.9    31.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 84 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32Q  ILE*     5.9     0.9    -      -       +      -
     34Q  VAL*     3.5    41.3    -      -       +      -
     39Q  LEU*     4.8     2.7    -      -       +      -
     42Q  ILE*     6.4     0.4    -      -       +      -
     51Q  LEU*     3.6    31.0    -      -       +      -
     70Q  VAL*     3.8    16.2    -      -       +      -
     72Q  VAL*     3.5    20.6    -      -       +      -
     80Q  GLN*     2.9    28.6    +      -       +      +
     81Q  ILE*     3.7     6.7    -      -       +      +
     83Q  ALA*     1.3    76.7    -      -       -      +
     85Q  ARG*     1.3    62.0    +      -       -      +
     87Q  SER*     2.5    21.0    +      -       -      -
     88Q  ILE*     2.9    24.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 85 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50Q  LYS*     3.1    49.3    +      -       -      +
     51Q  LEU*     4.1    17.4    -      -       +      +
     53Q  GLU*     2.5    34.4    +      -       -      +
     54Q  PRO*     4.1    16.8    -      -       +      +
     81Q  ILE*     2.9    17.2    +      -       -      +
     82Q  TYR*     4.1    19.1    -      -       -      +
     84Q  ILE*     1.3    78.1    -      -       -      +
     86Q  GLN*     1.3    57.4    +      -       -      +
     88Q  ILE*     3.3     6.5    +      -       -      +
     89Q  SER*     2.9    31.1    +      -       -      -
    115Q  TYR*     3.4    14.5    -      -       -      -
    116Q  ASP*     4.7     2.4    +      -       -      -
    118Q  THR*     4.2    13.9    +      -       -      -
    119Q  LEU*     3.3    36.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 86 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14Q  GLY      3.5    14.8    +      -       -      +
     15Q  ARG      3.0    18.1    +      -       -      +
     16Q  LYS*     4.5     4.2    +      -       -      +
     82Q  TYR*     2.9    22.2    +      -       -      +
     83Q  ALA*     4.1     2.0    -      -       -      +
     85Q  ARG*     1.3    78.7    -      -       -      +
     87Q  SER*     1.3    57.7    +      -       -      +
     89Q  SER*     3.2     1.9    +      -       -      -
     90Q  LYS*     2.9    64.7    +      -       +      +
    118Q  THR      4.1     9.5    -      -       -      +
    119Q  LEU*     3.3    22.2    -      -       -      +
    121Q  VAL      4.0     1.8    -      -       -      -
    122Q  ALA*     3.4    27.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 87 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12Q  VAL*     4.4     8.3    -      -       -      +
     14Q  GLY      4.5     9.8    +      -       -      +
     21Q  ALA*     4.0    14.6    -      -       -      -
     23Q  ALA*     3.3    18.9    -      -       -      +
     70Q  VAL*     3.8    14.1    -      -       -      +
     83Q  ALA      2.9    16.8    +      -       -      -
     84Q  ILE*     2.5    25.5    +      -       -      -
     86Q  GLN*     1.3    76.9    -      -       -      +
     88Q  ILE*     1.3    49.9    +      -       -      +
     90Q  LYS*     5.1     2.5    -      -       -      -
     91Q  ALA*     2.7    39.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 88 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32Q  ILE*     5.3    15.9    -      -       +      -
     51Q  LEU*     5.4     4.0    -      -       +      -
     54Q  PRO*     4.2    22.4    -      -       +      -
     55Q  VAL*     6.3     1.8    -      -       +      -
     68Q  ILE*     3.6    33.7    -      -       +      -
     70Q  VAL*     3.8    15.9    -      -       +      -
     84Q  ILE*     2.9    28.8    +      -       +      +
     85Q  ARG*     3.6     8.1    -      -       -      +
     87Q  SER*     1.3    73.9    -      -       -      +
     89Q  SER*     1.3    66.9    +      -       -      +
     91Q  ALA*     3.0     2.8    +      -       -      -
     92Q  LEU*     3.0    47.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 89 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54Q  PRO*     4.0    11.1    -      -       -      +
     58Q  LEU*     5.4     4.9    -      -       -      -
     85Q  ARG      2.9    17.9    +      -       -      -
     86Q  GLN      3.2     4.2    +      -       -      -
     88Q  ILE*     1.3    77.2    -      -       -      +
     90Q  LYS*     1.3    61.0    +      -       -      +
     92Q  LEU*     3.9     3.8    +      -       -      +
     93Q  VAL*     3.3    22.1    +      -       -      +
    112Q  LEU*     3.7    21.2    -      -       -      +
    119Q  LEU*     3.3    45.6    -      -       -      +
    120Q  LEU*     6.1     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 90 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   13961    A      5.7     2.8    +      -       -      -
     12Q  VAL*     3.5    28.3    -      -       +      +
     13Q  PHE*     5.0    12.8    +      -       -      +
     14Q  GLY      5.0     0.4    +      -       -      -
     15Q  ARG*     5.2     2.8    -      -       -      +
     86Q  GLN*     2.9    50.3    +      -       +      +
     87Q  SER*     5.8     0.2    -      -       -      -
     89Q  SER*     1.3    74.4    -      -       -      +
     91Q  ALA*     1.3    65.8    +      -       -      +
     93Q  VAL*     3.0    12.0    +      -       +      +
     94Q  ALA*     2.9    22.0    +      -       -      +
    119Q  LEU      4.1     6.3    -      -       -      +
    120Q  LEU*     3.1    38.0    +      -       +      +
    122Q  ALA*     4.3     9.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 91 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12Q  VAL*     3.7    13.0    -      -       +      +
     23Q  ALA*     3.6    25.1    -      -       +      +
     25Q  CYS*     3.7    10.8    -      -       +      -
     68Q  ILE*     4.5    12.6    -      -       +      -
     87Q  SER      2.7    22.7    +      -       -      +
     88Q  ILE*     3.0     6.0    +      -       -      +
     90Q  LYS*     1.3    77.7    -      -       -      +
     92Q  LEU*     1.3    64.0    +      -       -      +
     94Q  ALA*     3.2     3.1    +      -       -      +
     95Q  TYR*     2.9    23.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 92 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58Q  LEU*     3.5    29.2    -      -       +      -
     62Q  ARG*     3.5    36.1    -      -       +      +
     66Q  VAL*     5.9     6.5    -      -       +      -
     68Q  ILE*     3.5    26.9    -      -       +      -
     88Q  ILE*     3.0    40.1    +      -       +      +
     89Q  SER      4.2     4.9    -      -       -      +
     91Q  ALA*     1.3    76.5    -      -       -      +
     93Q  VAL*     1.3    59.4    +      -       +      +
     95Q  TYR*     3.3     7.9    +      -       +      +
     96Q  TYR*     2.9    44.2    +      -       +      -
    108Q  ILE*     6.1     0.9    -      -       +      -
    112Q  LEU*     5.7     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 93 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89Q  SER      3.3    18.4    -      -       -      +
     90Q  LYS*     3.0    12.5    +      -       -      +
     92Q  LEU*     1.3    77.4    -      -       +      +
     94Q  ALA*     1.3    57.4    +      -       -      +
     96Q  TYR*     3.2     1.9    +      -       -      -
     97Q  GLN*     2.9    33.1    +      -       -      +
    105Q  LYS*     3.1    41.6    -      -       +      +
    108Q  ILE*     5.5     3.4    -      -       +      -
    109Q  LYS*     4.9    12.1    -      -       +      +
    112Q  LEU*     4.0    17.7    -      -       +      -
    120Q  LEU*     4.3    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 94 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10Q  VAL*     3.5    31.4    -      -       +      -
     12Q  VAL*     3.8    17.5    -      -       +      -
     90Q  LYS      2.9     6.4    +      -       -      +
     91Q  ALA      3.6     7.0    -      -       -      +
     93Q  VAL*     1.3    74.9    -      -       -      +
     95Q  TYR*     1.3    60.6    +      -       -      +
     97Q  GLN*     2.8    36.2    +      -       -      +
     98Q  LYS*     3.0    17.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 95 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8Q  GLN*     5.7     5.4    -      -       +      -
      9Q  SER*     6.0     1.3    -      -       -      -
     10Q  VAL*     5.0     4.5    -      -       +      -
     25Q  CYS*     3.7    31.5    -      -       +      -
     26Q  LYS*     4.7     0.7    -      -       -      -
     27Q  ARG*     4.1    31.8    -      -       +      +
     65Q  GLY      4.3     4.0    +      -       -      -
     66Q  VAL*     3.5    33.5    -      -       +      +
     91Q  ALA      2.9    16.7    +      -       -      +
     92Q  LEU*     3.7     7.4    -      -       -      +
     94Q  ALA*     1.3    75.8    -      -       -      +
     96Q  TYR*     1.3    73.8    +      +       -      +
     98Q  LYS*     4.7     0.9    -      -       +      +
     99Q  TYR*     2.9    76.3    +      +       +      +
    100Q  VAL*     3.8     6.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 96 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62Q  ARG*     2.5    56.7    +      -       +      +
     66Q  VAL*     5.7     2.6    -      -       +      +
     92Q  LEU*     2.9    33.9    +      -       +      +
     93Q  VAL      3.5     0.2    -      -       -      -
     94Q  ALA      3.1     0.2    -      -       -      -
     95Q  TYR*     1.3    88.0    -      +       -      +
     97Q  GLN*     1.3    58.9    +      -       -      +
    100Q  VAL*     2.7    62.3    -      -       +      +
    101Q  ASP      4.1     2.9    -      -       -      +
    102Q  GLU*     4.4     1.2    -      -       -      +
    104Q  SER*     4.6     7.0    -      -       -      -
    105Q  LYS*     3.5    30.3    -      -       +      +
    108Q  ILE*     3.9    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 97 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   13981    G      5.5     2.3    -      -       -      +
     10Q  VAL*     5.8     0.2    -      -       -      +
     93Q  VAL*     2.9    31.0    +      -       -      +
     94Q  ALA*     2.8    27.0    +      -       -      +
     96Q  TYR*     1.3    79.6    -      -       -      +
     98Q  LYS*     1.3    70.4    -      -       +      +
    100Q  VAL      3.9     5.7    -      -       -      +
    102Q  GLU*     4.4     8.8    -      -       -      +
    105Q  LYS*     3.6    23.5    -      -       -      +
     60g  ARG*     6.0     4.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 98 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9Q  SER      5.5     0.4    -      -       -      +
     10Q  VAL*     3.5    31.6    -      -       +      -
     94Q  ALA      3.0     9.8    +      -       -      +
     95Q  TYR*     4.5     1.1    -      -       -      +
     97Q  GLN*     1.3    86.8    -      -       +      +
     99Q  TYR*     1.3    62.9    +      -       +      +
    100Q  VAL      3.7     0.7    +      -       -      +
     94g  THR      4.6     6.5    +      -       -      +
     96g  THR*     4.0    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 99 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8Q  GLN*     3.4    32.3    -      -       +      +
     27Q  ARG*     4.5    16.2    -      -       -      -
     95Q  TYR*     2.9    56.2    +      +       +      +
     98Q  LYS*     1.3    78.9    -      -       +      +
    100Q  VAL*     1.3    69.4    +      -       +      +
----------------------------------------------------------
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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