Contacts of the helix formed by residues 49 - 76 (chain C) in PDB entry 2HUE


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 LEU 49 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120B  MET*     5.4     5.4    -      -       +      -
    121B  PRO*     3.5    24.8    -      -       +      +
     47C  SER*     3.0    13.6    +      -       -      +
     48C  GLY*     1.3    76.7    -      -       -      +
     50C  ILE*     1.3    63.7    +      -       -      +
     51C  TYR      3.3     0.8    +      -       -      -
     52C  GLU*     3.5     8.4    +      -       +      +
     53C  GLU*     3.2    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 50 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104B  PHE*     4.2    15.5    -      -       +      -
    119B  ILE*     3.6    31.0    -      -       +      +
    120B  MET*     3.5    31.6    -      -       -      +
    121B  PRO*     3.7     4.0    -      -       +      -
    124B  ILE*     3.5    19.3    -      -       +      -
     34C  ILE*     4.4    11.0    -      -       +      -
     38C  ALA*     6.1     0.2    -      -       +      -
     46C  ILE*     4.1    13.9    -      -       +      -
     47C  SER*     3.0    24.2    +      -       -      +
     49C  LEU*     1.3    76.5    -      -       -      +
     51C  TYR*     1.3    61.7    +      -       -      +
     53C  GLU*     4.3     1.8    -      -       -      -
     54C  THR*     2.8    46.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 51 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31C  LYS*     3.6    64.8    -      -       +      -
     34C  ILE*     3.7    31.9    -      -       +      +
     35C  ARG*     2.9    39.4    +      -       +      +
     46C  ILE*     3.6    19.1    -      -       +      +
     48C  GLY*     3.4    29.8    -      -       -      +
     49C  LEU      3.3     1.0    -      -       -      -
     50C  ILE*     1.3    78.4    -      -       -      +
     52C  GLU*     1.3    64.2    +      -       -      +
     55C  ARG*     3.0    34.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 52 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27C  GLN*     4.4    14.4    +      -       -      -
     48C  GLY      5.0     0.6    +      -       -      -
     49C  LEU*     3.5     9.4    +      -       +      +
     51C  TYR*     1.3    78.8    -      -       -      +
     53C  GLU*     1.3    65.4    +      -       -      +
     55C  ARG*     3.4    13.4    +      -       -      +
     56C  GLY*     3.0    24.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 53 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  PRO*     3.7    34.3    -      -       +      +
    124B  ILE*     4.0    19.7    -      -       +      -
    125B  GLN*     2.5    39.8    +      -       -      +
     49C  LEU      3.2    18.2    +      -       -      +
     50C  ILE*     3.8     5.2    -      -       -      +
     51C  TYR      3.3     0.2    -      -       -      -
     52C  GLU*     1.3    78.5    -      -       -      +
     54C  THR*     1.3    62.0    +      -       -      +
     56C  GLY*     3.2     3.4    +      -       -      -
     57C  VAL*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 54 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100B  LEU*     4.1    19.9    -      -       +      +
    103B  LEU*     6.2     2.0    -      -       +      -
    104B  PHE*     3.4    33.4    -      -       +      -
    124B  ILE*     3.6     9.8    -      -       -      +
     29C  ILE*     4.0    19.1    -      -       +      -
     34C  ILE*     4.2    11.8    -      -       +      +
     37C  LEU*     5.9     0.2    -      -       +      -
     50C  ILE*     2.8    32.1    +      -       -      +
     51C  TYR      3.8     2.9    -      -       -      -
     53C  GLU*     1.3    72.4    -      -       -      +
     55C  ARG*     1.3    58.4    +      -       -      +
     57C  VAL*     3.2     6.8    +      -       -      +
     58C  LEU*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 55 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70B  LEU*     6.2     0.2    -      -       -      +
     27C  GLN*     3.4    48.5    -      -       -      +
     29C  ILE*     2.9    36.3    +      -       +      -
     30C  THR*     3.7    13.1    -      -       -      +
     31C  LYS*     3.8    33.5    -      -       -      +
     34C  ILE*     4.0    12.0    -      -       +      +
     51C  TYR*     3.0    25.9    +      -       -      +
     52C  GLU*     3.7    17.3    +      -       -      +
     53C  GLU      3.3     0.2    -      -       -      -
     54C  THR*     1.3    75.9    -      -       -      +
     56C  GLY*     1.3    61.7    +      -       -      +
     58C  LEU*     3.3     7.2    +      -       -      +
     59C  LYS*     3.0    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 56 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  ARG*     5.8     0.2    -      -       -      -
     52C  GLU*     3.0    20.6    +      -       -      -
     53C  GLU      3.2     3.6    +      -       -      -
     55C  ARG*     1.3    75.1    -      -       -      +
     57C  VAL*     1.3    62.9    +      -       -      +
     59C  LYS*     3.2     9.4    +      -       -      +
     60C  VAL*     3.1    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 57 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  TYR*     3.4    28.2    +      -       +      +
    100B  LEU*     4.9     1.8    -      -       +      -
    103B  LEU*     3.7    20.9    -      -       +      -
    124B  ILE*     3.7    16.2    -      -       +      -
    125B  GLN*     3.8    12.3    -      -       -      +
    128B  ARG*     3.6    36.7    +      -       -      +
     53C  GLU      3.0    16.2    +      -       -      +
     54C  THR*     3.2     5.8    +      -       -      +
     56C  GLY*     1.3    73.0    -      -       -      +
     58C  LEU*     1.3    66.0    +      -       -      +
     60C  VAL*     3.3     4.3    +      -       -      +
     61C  PHE*     3.0    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 58 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67B  PHE*     4.7     5.6    -      -       +      -
     70B  LEU*     4.4    12.3    -      -       +      -
     96B  SER*     3.8    31.0    -      -       -      +
     99B  TYR*     5.3     0.4    -      -       +      -
    100B  LEU*     4.4    20.1    -      -       +      +
     29C  ILE*     3.6    42.6    -      -       +      +
     54C  THR      2.9    16.3    +      -       -      +
     55C  ARG*     3.6     6.7    -      -       -      +
     56C  GLY      3.3     0.2    -      -       -      -
     57C  VAL*     1.3    79.3    -      -       -      +
     59C  LYS*     1.3    57.6    +      -       -      +
     61C  PHE*     3.2    12.3    +      -       +      +
     62C  LEU*     2.9    48.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 59 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70B  LEU*     5.4     8.7    -      -       +      -
     74B  ILE*     4.5    11.2    -      -       +      -
     24C  ASP*     5.2     6.5    +      -       -      +
     55C  ARG      3.0    17.4    +      -       -      +
     56C  GLY*     3.7     7.4    -      -       -      +
     57C  VAL      3.2     0.2    -      -       -      -
     58C  LEU*     1.3    79.8    -      -       -      +
     60C  VAL*     1.3    58.0    +      -       +      +
     62C  LEU*     3.5     6.5    +      -       -      +
     63C  GLU*     2.9    59.8    +      -       +      +
    502C  GOL      3.0    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 60 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  ARG*     3.6    28.7    -      -       -      +
     56C  GLY      3.1    15.1    +      -       -      +
     57C  VAL*     3.7     6.7    -      -       -      +
     59C  LYS*     1.3    75.5    -      -       +      +
     61C  PHE*     1.3    67.0    +      -       -      +
     63C  GLU*     3.2    13.8    +      -       -      +
     64C  ASN*     3.0    42.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 61 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92B  LEU*     5.1     1.6    -      -       +      -
     95B  ALA*     4.0     6.1    -      -       +      -
     96B  SER*     3.8    32.5    -      -       -      -
     99B  TYR*     3.7    53.6    -      +       +      -
     57C  VAL      3.0    14.0    +      -       -      +
     58C  LEU*     3.5    11.7    -      -       +      +
     60C  VAL*     1.3    78.1    -      -       -      +
     62C  LEU*     1.3    70.9    +      -       +      +
     64C  ASN*     3.4     6.0    +      -       -      +
     65C  VAL*     3.0    42.0    +      -       +      +
     90C  LEU*     3.7    25.1    -      -       +      -
     93C  GLN*     3.8    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 62 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67B  PHE*     4.0    20.0    -      -       +      -
     70B  LEU*     3.7    31.4    -      -       +      -
     71B  VAL*     4.7     9.0    -      -       +      -
     74B  ILE*     3.6    19.3    -      -       +      -
     92B  LEU*     4.3    17.9    -      -       +      -
     96B  SER*     3.4    22.2    -      -       -      +
     58C  LEU*     2.9    34.5    +      -       +      +
     61C  PHE*     1.3    81.1    -      -       +      +
     63C  GLU*     1.3    61.5    +      -       -      +
     65C  VAL*     4.7     1.6    -      -       -      -
     66C  ILE*     2.8    41.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 63 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  ILE*     3.9    24.2    -      -       +      -
     78B  PHE*     3.6    12.8    -      -       +      -
     59C  LYS*     2.9    57.4    +      -       +      +
     60C  VAL*     3.2    17.0    +      -       -      +
     62C  LEU*     1.3    76.7    -      -       -      +
     64C  ASN*     1.3    59.0    +      -       -      +
     67C  ARG*     2.9    43.7    +      -       -      +
    502C  GOL      4.8     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 64 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134B  ARG      6.0     4.2    -      -       -      -
     60C  VAL*     3.0    38.1    +      -       -      +
     61C  PHE*     3.7     6.4    -      -       -      +
     63C  GLU*     1.3    77.1    -      -       -      +
     65C  VAL*     1.3    64.5    +      -       +      +
     67C  ARG*     3.0    29.0    +      -       -      +
     68C  ASP*     3.4    27.6    +      -       -      +
     92C  ARG*     5.4     4.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 65 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92B  LEU*     3.5    29.6    -      -       +      -
     61C  PHE*     3.0    34.2    +      -       +      +
     62C  LEU*     4.0     2.9    -      -       -      +
     64C  ASN*     1.3    77.1    -      -       +      +
     66C  ILE*     1.3    58.5    +      -       -      +
     68C  ASP*     3.2     2.9    +      -       -      -
     69C  ALA*     2.9    26.1    +      -       +      +
     86C  VAL*     4.5     4.7    -      -       +      +
     89C  ALA*     3.5    32.0    -      -       +      +
     90C  LEU*     3.9    29.8    -      -       +      -
     93C  GLN*     6.2     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 66 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  VAL*     4.0    27.1    -      -       +      +
     74B  ILE*     3.8    23.1    -      -       +      -
     75B  ALA*     3.9    28.3    -      -       +      +
     78B  PHE*     4.0     6.5    -      -       +      -
     84B  PHE*     4.0     7.4    -      -       +      -
     92B  LEU*     4.0    24.0    -      -       +      -
     62C  LEU*     2.8    35.8    +      -       +      +
     63C  GLU      4.3     1.3    -      -       -      +
     65C  VAL*     1.3    68.4    -      -       -      +
     67C  ARG*     1.3    60.3    +      -       -      +
     69C  ALA*     4.1     5.8    -      -       -      -
     70C  VAL*     2.8    41.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 67 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78B  PHE*     3.7    43.7    -      -       +      -
     63C  GLU*     2.9    30.0    +      -       -      +
     64C  ASN*     3.0    42.0    +      -       -      +
     66C  ILE*     1.3    78.4    -      -       -      +
     68C  ASP*     1.3    68.2    +      -       -      +
     70C  VAL*     3.9     2.8    -      -       -      +
     71C  THR*     3.0    30.1    +      -       -      +
     92C  ARG*     5.9     2.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 68 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64C  ASN      3.4    11.7    +      -       -      +
     65C  VAL*     3.2     8.0    +      -       -      +
     67C  ARG*     1.3    86.3    +      -       -      +
     69C  ALA*     1.3    65.2    +      -       -      +
     71C  THR*     3.1    19.3    +      -       -      -
     72C  TYR*     3.1    36.9    +      -       +      +
     89C  ALA*     3.8    15.7    -      -       +      +
     92C  ARG*     2.8    48.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 69 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84B  PHE*     5.4     2.5    -      -       +      -
     65C  VAL*     2.9    17.5    +      -       +      +
     66C  ILE*     3.7     8.7    -      -       -      +
     68C  ASP*     1.3    75.9    -      -       -      +
     70C  VAL*     1.3    62.8    +      -       +      +
     72C  TYR*     3.3    12.7    +      -       -      +
     73C  THR*     2.9    27.1    +      -       -      -
     81C  VAL*     4.0    21.1    -      -       +      -
     85C  ASP*     3.7    18.6    -      -       +      +
     86C  VAL*     4.3     9.2    -      -       +      -
     89C  ALA*     4.0     2.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 70 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  ALA*     4.9     1.8    -      -       +      -
     78B  PHE*     4.5    16.4    -      -       +      +
     79B  LYS*     4.1     7.6    -      -       +      -
     82B  LEU*     3.5    34.3    -      -       +      -
     84B  PHE*     5.0     0.2    -      -       +      -
     66C  ILE*     2.8    36.7    +      -       +      +
     67C  ARG      3.9     4.5    -      -       -      +
     69C  ALA*     1.3    76.6    -      -       +      +
     71C  THR*     1.3    56.5    +      -       -      +
     73C  THR*     3.2     7.3    +      -       -      -
     74C  GLU*     2.9    49.9    +      -       +      +
     81C  VAL*     4.5     8.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 71 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  TYR*     3.9    21.3    -      -       +      -
     67C  ARG*     3.0    19.3    +      -       -      +
     68C  ASP*     3.1    14.8    +      -       -      -
     70C  VAL*     1.3    77.2    -      -       -      +
     72C  TYR*     1.3    66.0    +      -       +      +
     74C  GLU*     3.4    11.7    +      -       -      +
     75C  HIS*     2.9    48.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 72 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  TYR*     3.8    53.4    +      +       +      +
     68C  ASP*     3.1    41.7    +      -       +      +
     69C  ALA*     3.7     2.9    -      -       -      +
     70C  VAL      3.2     0.2    -      -       -      -
     71C  THR*     1.3    81.0    -      -       +      +
     73C  THR*     1.3    63.3    +      -       -      +
     75C  HIS*     3.3     2.4    +      -       -      +
     76C  ALA*     3.1    24.3    +      -       -      +
     78C  ARG*     4.1     0.9    +      -       -      -
     85C  ASP*     3.6    35.0    -      -       -      +
     88C  TYR*     3.3    41.1    -      +       +      -
     89C  ALA*     4.1    10.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 73 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  LEU*     4.0    13.0    -      -       +      -
     69C  ALA      2.9    12.0    +      -       -      -
     70C  VAL*     3.2    11.2    +      -       -      -
     72C  TYR*     1.3    78.0    -      -       -      +
     74C  GLU*     1.3    61.7    +      -       -      +
     76C  ALA      3.2     6.4    +      -       -      -
     78C  ARG*     3.1    65.2    +      -       +      +
     80C  THR      3.4    18.4    -      -       -      +
     81C  VAL*     3.5    12.8    -      -       -      +
     85C  ASP*     2.8    19.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 74 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78B  PHE      4.7     2.8    -      -       -      +
     79B  LYS*     3.1    45.0    +      -       +      +
     82B  LEU*     5.7     0.2    -      -       +      -
     70C  VAL*     2.9    27.5    +      -       +      +
     71C  THR*     3.7    12.1    +      -       -      +
     73C  THR*     1.3    78.7    -      -       +      +
     75C  HIS*     1.3    63.0    +      -       +      +
     77C  LYS*     3.0    20.4    +      -       -      +
     78C  ARG      4.3     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 75 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  TYR*     3.2    41.4    -      +       -      +
     71C  THR*     2.9    37.0    +      -       +      +
     72C  TYR      3.3     2.4    +      -       -      +
     73C  THR      3.3     0.2    -      -       -      -
     74C  GLU*     1.3    82.0    -      -       +      +
     76C  ALA*     1.3    57.9    +      -       -      +
     77C  LYS*     3.1     5.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 76 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  TYR      3.1    10.0    +      -       -      +
     73C  THR      3.7     2.0    -      -       -      +
     74C  GLU      3.2     0.8    -      -       -      -
     75C  HIS*     1.3    75.2    -      -       -      +
     77C  LYS*     1.3    72.0    +      -       -      +
     78C  ARG*     3.3    41.6    +      -       -      +
----------------------------------------------------------
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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