Contacts of the helix formed by residues 64 - 95 (chain C) in PDB entry 4DAJ


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 ILE 64 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  THR*     1.3    83.1    -      -       -      +
     65C  TRP*     1.3    58.1    +      -       +      +
     67C  VAL*     3.7     8.7    -      -       +      +
     68C  VAL*     2.9    40.2    +      -       +      +
    131C  ASN*     5.8     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 65 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  THR      4.2     6.7    -      -       -      +
     64C  ILE*     1.3    78.0    -      -       +      +
     66C  GLN*     1.3    65.1    +      -       +      +
     68C  VAL*     3.0    19.0    +      -       +      +
     69C  PHE*     3.0    13.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 66 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  THR*     3.1    28.8    +      -       -      +
     65C  TRP*     1.3    82.7    -      -       +      +
     67C  VAL*     1.3    62.5    +      -       +      +
     69C  PHE*     3.2     9.2    +      -       -      +
     70C  ILE*     2.9    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 67 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  THR*     3.1    22.7    +      -       -      +
     64C  ILE*     3.7     8.5    -      -       +      +
     66C  GLN*     1.3    87.0    -      -       +      +
     68C  VAL*     1.3    58.0    +      -       +      +
     70C  ILE*     3.9     5.3    -      -       -      +
     71C  ALA*     2.9    29.9    +      -       +      +
    128C  ILE      5.3     9.2    -      -       -      +
    129C  ILE*     5.3     9.2    -      -       -      +
    131C  ASN*     6.4     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 68 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64C  ILE*     2.9    32.1    +      -       +      +
     65C  TRP*     3.0    11.8    +      -       +      +
     67C  VAL*     1.3    74.8    -      -       +      +
     69C  PHE*     1.3    66.5    +      -       -      +
     71C  ALA*     3.1     7.7    +      -       +      +
     72C  PHE*     2.9    25.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 69 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  TRP*     3.0    12.5    +      -       +      +
     66C  GLN*     3.5    12.6    -      -       -      +
     68C  VAL*     1.3    78.4    -      -       -      +
     70C  ILE*     1.3    57.4    +      -       -      +
     72C  PHE*     3.1     8.8    +      -       -      +
     73C  LEU*     2.9    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 70 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66C  GLN      2.9    18.7    +      -       -      +
     67C  VAL*     4.1     5.2    -      -       -      +
     69C  PHE*     1.3    72.8    -      -       -      +
     71C  ALA*     1.3    58.6    +      -       -      +
     73C  LEU*     2.9    20.6    -      -       +      +
     74C  THR*     2.9    25.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 71 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67C  VAL*     2.9    24.1    +      -       +      +
     68C  VAL*     3.1    10.7    +      -       +      +
     70C  ILE*     1.3    77.2    -      -       -      +
     72C  PHE*     1.3    56.7    -      -       -      +
     74C  THR*     2.9    26.2    +      -       -      -
     75C  GLY*     2.9     9.2    +      -       -      -
    125C  THR*     4.0    20.3    -      -       +      +
    129C  ILE*     5.5     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 72 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68C  VAL*     2.9    14.8    +      -       +      +
     69C  PHE*     3.7     8.5    -      -       -      +
     71C  ALA*     1.3    71.5    -      -       -      +
     73C  LEU*     1.3    60.6    +      -       -      +
     75C  GLY*     3.2     8.0    +      -       -      +
     76C  PHE*     2.9    29.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 73 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  PHE      2.9    10.6    +      -       -      +
     70C  ILE*     2.9    26.2    -      -       +      +
     72C  PHE*     1.3    74.0    -      -       -      +
     74C  THR*     1.3    62.9    +      -       -      +
     76C  PHE*     3.0    26.8    +      -       +      +
     77C  LEU*     3.0    21.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 74 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70C  ILE      2.9    10.7    +      -       -      -
     71C  ALA*     2.9    15.3    +      -       -      -
     73C  LEU*     1.3    74.3    -      -       -      +
     75C  GLY*     1.3    62.1    +      -       -      +
     77C  LEU*     3.2     9.4    +      -       -      +
     78C  ALA*     2.9    24.1    +      -       -      +
    121C  MET*     4.6     2.8    -      -       -      +
    125C  THR*     3.6    26.7    -      -       -      -
    530C  TRP*     3.8    22.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 75 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71C  ALA      2.9    11.4    +      -       -      -
     72C  PHE*     3.2    13.0    +      -       -      -
     73C  LEU      3.1     0.6    -      -       -      -
     74C  THR*     1.3    75.4    -      -       -      +
     76C  PHE*     1.3    62.7    +      -       -      +
     78C  ALA*     3.2     8.6    +      -       -      +
     79C  LEU*     2.9    23.1    +      -       -      +
    122C  ASN*     5.8     2.5    -      -       -      -
    125C  THR*     5.3     1.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 76 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  PHE*     2.9    17.3    +      -       +      +
     73C  LEU*     3.0    29.2    -      -       +      +
     75C  GLY*     1.3    73.4    -      -       -      +
     77C  LEU*     1.3    83.6    +      -       +      +
     79C  LEU*     2.8    27.0    +      -       +      +
     80C  VAL*     2.9    37.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 77 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73C  LEU*     3.0    11.5    +      -       +      +
     74C  THR*     3.2    10.7    +      -       -      +
     76C  PHE*     1.3    85.7    -      -       +      +
     78C  ALA*     1.3    57.4    +      -       -      +
     80C  VAL*     3.2     8.9    +      -       +      +
     81C  THR*     2.9    31.2    +      -       -      -
    121C  MET*     4.3    10.5    -      -       +      -
    530C  TRP*     4.5    13.7    -      -       +      -
    533C  TYR*     5.3     0.2    -      -       +      -
    534C  ILE*     3.6    30.5    -      -       +      +
    537C  THR*     3.5    35.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 78 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74C  THR      2.9    13.2    +      -       -      +
     75C  GLY*     3.5    11.2    -      -       -      +
     77C  LEU*     1.3    76.2    -      -       -      +
     79C  LEU*     1.3    58.0    +      -       -      +
     81C  THR*     3.4     1.6    +      -       -      -
     82C  ILE*     2.9    39.4    +      -       +      +
    117C  GLY      4.3     5.2    -      -       -      +
    121C  MET*     3.4    38.3    -      -       +      +
    122C  ASN*     4.7    11.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 79 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75C  GLY      2.9    11.5    +      -       -      +
     76C  PHE*     2.8    20.0    +      -       +      +
     78C  ALA*     1.3    74.3    -      -       -      +
     80C  VAL*     1.3    65.3    +      -       +      +
     82C  ILE*     2.9    38.1    -      -       +      +
     83C  ILE*     2.9    31.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 80 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76C  PHE*     2.9    51.5    +      -       +      +
     77C  LEU*     3.4    10.1    -      -       +      +
     79C  LEU*     1.3    75.9    -      -       +      +
     81C  THR*     1.3    63.7    +      -       -      +
     83C  ILE*     3.2    14.8    -      -       +      +
     84C  GLY*     2.9    22.2    +      -       -      -
    537C  THR*     4.2    18.2    -      -       +      +
    540C  PRO*     5.7     0.3    -      -       -      +
    541C  VAL*     5.7     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 81 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77C  LEU      2.9    12.1    +      -       -      -
     78C  ALA      3.5     8.3    -      -       -      -
     80C  VAL*     1.3    77.6    -      -       -      +
     82C  ILE*     1.3    59.6    +      -       -      +
     84C  GLY*     3.7     0.6    -      -       -      -
     85C  ASN*     2.8    53.9    +      -       -      +
    113C  ASP      3.7    12.1    -      -       -      +
    116C  ILE*     5.3     0.7    -      -       +      -
    117C  GLY*     4.2     9.4    -      -       -      +
    121C  MET*     4.2     8.7    -      -       -      -
    533C  TYR      5.8     0.2    -      -       -      +
    536C  SER*     4.0    19.1    -      -       -      +
    537C  THR*     2.7    36.3    +      -       -      +
    540C  PRO*     4.7     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 82 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78C  ALA*     2.9    25.8    +      -       +      +
     79C  LEU*     2.9    45.1    -      -       +      +
     81C  THR*     1.3    72.7    -      -       -      +
     83C  ILE*     1.3    69.0    +      -       +      +
     85C  ASN*     3.9     6.4    -      -       -      +
     86C  ILE*     3.0    30.5    +      -       +      +
    114C  LEU*     4.7     7.9    -      -       +      +
    117C  GLY*     3.7    30.7    -      -       -      +
    118C  VAL*     3.9    13.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 83 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79C  LEU*     2.9    38.5    +      -       +      +
     80C  VAL*     3.2    22.0    -      -       +      +
     82C  ILE*     1.3    76.8    -      -       +      +
     84C  GLY*     1.3    62.9    +      -       -      +
     86C  ILE*     3.1     9.1    +      -       -      +
     87C  LEU*     2.9    39.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 84 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80C  VAL      2.9    18.5    +      -       -      -
     81C  THR      3.7     0.9    -      -       -      -
     83C  ILE*     1.3    80.1    -      -       -      +
     85C  ASN*     1.3    57.7    +      -       -      +
     87C  LEU*     3.3    13.2    +      -       -      +
     88C  VAL*     3.0    32.6    +      -       -      +
    540C  PRO*     4.1    14.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 85 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81C  THR*     2.8    29.5    +      -       -      +
     82C  ILE      3.9     3.5    -      -       -      +
     84C  GLY*     1.3    71.9    -      -       -      +
     86C  ILE*     1.3    61.3    +      -       -      +
     88C  VAL*     3.0     9.5    +      -       -      +
     89C  ILE*     2.9    33.5    +      -       -      +
    110C  ALA*     3.6    26.4    -      -       -      +
    113C  ASP*     3.2    38.8    +      -       -      +
    114C  LEU*     3.3    14.6    -      -       +      +
    540C  PRO*     3.1    23.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 86 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82C  ILE*     3.0    20.1    +      -       +      +
     83C  ILE*     3.4    11.7    -      -       -      +
     85C  ASN*     1.3    77.3    -      -       -      +
     87C  LEU*     1.3    62.7    +      -       +      +
     89C  ILE*     4.1     4.2    -      -       +      +
     90C  VAL*     2.9    52.0    +      -       +      +
    114C  LEU*     3.7    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 87 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83C  ILE*     2.9    23.1    +      -       +      +
     84C  GLY*     3.4    13.0    -      -       -      +
     86C  ILE*     1.3    80.3    -      -       +      +
     88C  VAL*     1.3    59.0    +      -       +      +
     90C  VAL*     4.6     4.7    -      -       +      -
     91C  ALA*     2.8    37.1    +      -       +      +
    554C  PHE*     4.5    30.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 88 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84C  GLY      3.0    19.7    +      -       -      +
     85C  ASN*     3.0     9.4    +      -       -      +
     87C  LEU*     1.3    76.7    -      -       +      +
     89C  ILE*     1.3    58.1    +      -       -      +
     91C  ALA*     3.7     3.0    -      -       -      +
     92C  PHE*     2.9    31.2    +      -       +      +
    106C  LEU*     4.6     2.7    -      -       +      +
    107C  LEU*     4.7     7.6    -      -       +      -
    110C  ALA*     3.4    26.2    -      -       +      -
    540C  PRO*     4.2    11.2    -      -       +      +
    543C  TYR*     3.8    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 89 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85C  ASN      2.9    19.0    +      -       -      +
     86C  ILE*     4.1     5.4    -      -       +      +
     88C  VAL*     1.3    69.8    -      -       -      +
     90C  VAL*     1.3    70.6    +      -       +      +
     92C  PHE*     3.2     5.9    +      -       -      +
     93C  LYS*     2.9    28.4    +      -       +      +
    107C  LEU*     4.0    23.7    -      -       +      +
    110C  ALA*     4.4     9.9    -      -       +      +
    111C  CYS*     4.1    25.8    -      -       -      -
    114C  LEU*     3.8    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 90 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86C  ILE*     2.9    47.1    +      -       +      +
     87C  LEU*     4.1     5.4    -      -       +      +
     89C  ILE*     1.3    75.4    -      -       +      +
     91C  ALA*     1.3    67.6    +      -       -      +
     93C  LYS*     3.0     4.5    +      -       -      +
     94C  VAL*     2.9    36.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 91 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87C  LEU*     2.8    25.9    +      -       +      +
     88C  VAL*     3.7     3.4    -      -       -      +
     90C  VAL*     1.3    75.0    -      -       -      +
     92C  PHE*     1.3    62.9    +      -       -      +
     94C  VAL*     3.5     8.3    +      -       -      +
     95C  ASN*     3.0    29.8    +      -       -      +
     98C  LEU*     3.8     6.1    -      -       +      -
    553C  THR*     3.6    26.9    -      -       +      -
    554C  PHE*     5.4     4.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 92 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88C  VAL*     2.9    20.3    +      -       +      +
     89C  ILE      3.2     3.6    +      -       -      +
     91C  ALA*     1.3    75.7    -      -       -      +
     93C  LYS*     1.3    66.9    +      -       +      +
     95C  ASN      2.9    25.1    +      -       -      +
     98C  LEU*     3.6    27.3    -      -       +      +
     99C  LYS*     3.4    47.9    +      -       +      +
    100C  THR      4.2     0.2    -      -       -      -
    103C  ASN*     3.6    32.3    -      -       +      -
    104C  TYR*     3.9    27.4    -      +       -      -
    107C  LEU*     3.3    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 93 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89C  ILE*     2.9    23.1    +      -       +      +
     90C  VAL*     3.7     4.7    -      -       -      +
     92C  PHE*     1.3    82.4    -      -       +      +
     94C  VAL*     1.3    59.9    +      -       +      +
     99C  LYS*     2.9    24.2    +      -       -      +
    107C  LEU*     6.1     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 94 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  VAL*     2.9    29.8    +      -       +      +
     91C  ALA*     3.5    12.8    -      -       -      +
     93C  LYS*     1.3    77.1    -      -       +      +
     95C  ASN*     1.3    60.7    +      -       +      +
     96C  LYS      4.2     1.1    +      -       -      -
    553C  THR*     5.9     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 95 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91C  ALA      3.0    18.8    +      -       -      +
     92C  PHE      2.9    16.5    -      -       -      +
     93C  LYS      3.3     0.4    -      -       -      -
     94C  VAL*     1.3    82.3    -      -       +      +
     96C  LYS*     1.3    63.5    +      -       -      +
     97C  GLN*     2.9    26.2    +      -       -      +
     98C  LEU*     3.3    21.6    +      -       +      +
     99C  LYS*     3.4    12.8    +      -       -      +
    549C  THR*     5.4     1.4    -      -       -      +
    553C  THR*     3.4    31.5    +      -       +      +
----------------------------------------------------------
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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