Contacts of the helix formed by residues 791 - 818 (chain A) in PDB entry 1QU2


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 791 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    679A  ARG*     3.2    37.2    +      -       -      +
    683A  ASN*     2.9    20.1    +      -       -      +
    789A  GLU      4.2     0.4    +      -       -      -
    790A  VAL*     1.3    70.9    -      -       -      +
    792A  GLN*     1.3    59.9    +      -       -      +
    793A  ALA*     2.9    12.5    +      -       -      +
    794A  LEU*     2.9    26.3    +      -       +      +
    795A  LEU*     3.2    23.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 792 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687A  GLU*     4.8     1.4    -      -       -      +
    790A  VAL*     3.2    16.9    +      -       +      +
    791A  ASP*     1.3    70.1    +      -       -      +
    793A  ALA*     1.3    60.1    +      -       -      +
    795A  LEU*     3.3    16.8    +      -       -      +
    796A  ASP*     2.7    59.6    +      -       -      +
    799A  ARG*     3.2    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 793 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    791A  ASP*     2.9     8.5    +      -       -      +
    792A  GLN*     1.3    75.6    -      -       -      +
    794A  LEU*     1.3    65.8    +      -       -      +
    796A  ASP*     3.4     8.8    +      -       -      +
    797A  LYS*     3.0    25.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 794 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676A  GLU*     3.6    20.6    -      -       +      +
    679A  ARG*     3.6    26.2    -      -       -      +
    680A  TYR*     3.5    28.5    -      -       +      +
    683A  ASN*     3.5    26.7    -      -       +      +
    791A  ASP*     2.9    27.6    +      -       -      +
    793A  ALA*     1.3    77.5    -      -       -      +
    795A  LEU*     1.3    57.9    +      -       -      +
    797A  LYS*     3.3     6.4    +      -       +      +
    798A  TRP*     2.9    64.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 795 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    680A  TYR*     4.2    10.6    -      -       +      -
    683A  ASN*     4.0    24.0    -      -       +      -
    684A  ARG*     3.8    30.5    -      -       +      -
    687A  GLU*     3.8    27.4    -      -       +      +
    790A  VAL*     3.9    23.1    -      -       +      -
    791A  ASP      3.2    10.3    +      -       -      +
    792A  GLN*     3.5    28.0    -      -       -      +
    793A  ALA      3.2     0.6    -      -       -      -
    794A  LEU*     1.3    77.0    -      -       -      +
    796A  ASP*     1.3    54.8    +      -       -      +
    798A  TRP*     3.2     1.4    +      -       -      +
    799A  ARG*     2.7    48.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 796 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    792A  GLN*     2.7    55.0    +      -       -      +
    793A  ALA*     3.9     8.0    -      -       -      +
    795A  LEU*     1.3    70.7    -      -       -      +
    797A  LYS*     1.3    64.9    +      -       -      +
    799A  ARG*     3.2    19.4    +      -       -      +
    800A  THR*     3.1    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 797 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676A  GLU*     2.8    31.4    +      -       -      +
    793A  ALA      3.0    18.4    +      -       -      +
    794A  LEU*     3.5     7.2    -      -       +      +
    796A  ASP*     1.3    80.8    -      -       -      +
    798A  TRP*     1.3    62.1    +      -       +      +
    800A  THR*     3.3     7.3    +      -       -      -
    801A  PHE*     3.0    20.6    +      -       -      +
    842A  PHE*     3.5    15.7    -      -       +      -
    845A  SER*     2.9    41.9    +      -       -      -
    846A  PHE*     3.7    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 798 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676A  GLU*     3.5    31.9    +      -       +      +
    677A  VAL*     3.8    41.1    -      -       +      -
    680A  TYR*     3.4    42.8    -      +       +      +
    794A  LEU*     2.9    42.8    +      -       +      +
    797A  LYS*     1.3    77.0    -      -       +      +
    799A  ARG*     1.3    57.9    +      -       -      +
    800A  THR      3.1     1.6    -      -       -      -
    801A  PHE*     3.5    38.4    -      +       -      +
    802A  MET*     2.7    52.1    +      -       +      +
    846A  PHE*     3.6    30.1    -      +       -      -
    847A  ASP      6.2     0.2    -      -       -      -
    852A  LEU*     3.9    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 799 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    680A  TYR*     5.6     5.2    -      -       +      +
    684A  ARG*     6.0     4.0    -      -       -      +
    687A  GLU*     2.9    30.9    +      -       -      -
    792A  GLN*     3.2    32.8    +      -       -      +
    795A  LEU*     2.7    39.8    +      -       +      +
    796A  ASP*     3.4    16.3    +      -       -      +
    798A  TRP*     1.3    72.4    -      -       -      +
    800A  THR*     1.3    58.7    +      -       -      +
    802A  MET*     3.3     8.1    +      -       -      +
    803A  ASN*     3.1    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 800 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    796A  ASP      3.1    12.2    +      -       -      -
    797A  LYS*     3.4    10.3    -      -       -      -
    799A  ARG*     1.3    75.0    -      -       -      +
    801A  PHE*     1.3    65.8    +      -       -      +
    803A  ASN*     3.1    10.7    +      -       -      +
    804A  LEU*     3.0    21.1    +      -       -      +
    837A  PHE*     3.5    28.7    -      -       +      -
    842A  PHE*     3.4    21.8    -      -       +      -
    873A  HIS*     4.2     8.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 801 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    719A  PHE*     5.2     0.7    -      +       -      -
    797A  LYS      3.0     8.7    +      -       -      +
    798A  TRP*     3.1    28.7    +      +       -      +
    800A  THR*     1.3    76.1    -      -       -      +
    802A  MET*     1.3    65.5    +      -       +      +
    804A  LEU*     3.1     6.5    +      -       +      +
    805A  ARG*     2.7    39.0    +      -       +      -
    842A  PHE*     3.7     9.1    -      +       -      -
    843A  LEU*     4.2    10.3    -      -       +      -
    846A  PHE*     3.4    38.8    -      +       +      -
    849A  LEU*     3.8    16.6    -      -       +      -
    852A  LEU*     3.6    35.4    -      -       +      -
    853A  PHE*     3.4    39.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with MET 802 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    680A  TYR*     3.9    27.4    -      -       +      +
    715A  GLU*     5.6     1.3    -      -       -      +
    719A  PHE*     3.4    48.2    -      -       +      -
    798A  TRP*     2.7    36.3    +      -       +      +
    799A  ARG*     3.6     8.1    -      -       -      +
    800A  THR      3.1     0.2    -      -       -      -
    801A  PHE*     1.3    77.8    -      -       +      +
    803A  ASN*     1.3    67.1    +      -       -      +
    805A  ARG*     3.0    36.4    +      -       -      +
    806A  ASP*     3.0    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 803 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    799A  ARG*     3.1    23.2    +      -       -      +
    800A  THR*     3.1     7.2    +      -       -      +
    802A  MET*     1.3    78.0    -      -       -      +
    804A  LEU*     1.3    61.1    +      -       -      +
    806A  ASP*     3.5    23.1    +      -       -      +
    807A  ASP*     3.5    17.3    +      -       -      +
    873A  HIS*     3.6    26.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 804 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    800A  THR      3.0    12.7    +      -       -      +
    801A  PHE*     3.3    11.4    -      -       +      +
    802A  MET      3.0     0.2    -      -       -      -
    803A  ASN*     1.3    77.7    -      -       -      +
    805A  ARG*     1.3    63.2    +      -       -      +
    807A  ASP*     3.2    13.0    +      -       +      +
    808A  VAL*     3.2    17.2    +      -       +      +
    831A  ILE*     4.1    13.5    -      -       +      -
    837A  PHE*     3.9    27.4    -      -       +      -
    839A  ALA*     4.8     1.3    -      -       +      -
    842A  PHE*     4.0     5.8    -      -       +      -
    843A  LEU*     3.9    29.8    -      -       +      -
    853A  PHE*     3.5    29.4    -      -       +      -
    873A  HIS*     3.8    29.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 805 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    718A  ASN*     3.5    20.6    +      -       -      +
    719A  PHE*     3.8    34.2    -      -       -      +
    722A  ASP*     5.8     0.4    +      -       -      -
    801A  PHE*     2.7    17.4    +      -       +      +
    802A  MET*     3.0    25.4    +      -       -      +
    804A  LEU*     1.3    78.0    -      -       -      +
    806A  ASP*     1.3    69.3    +      -       -      +
    808A  VAL*     3.2     3.9    +      -       -      +
    809A  ASN*     2.9    47.6    +      -       -      +
    852A  LEU      4.3    14.5    +      -       -      -
    853A  PHE*     3.9    26.3    -      -       +      +
    854A  ILE*     5.8     6.3    -      -       -      +
     40T    G      4.3     2.0    +      -       -      -
     41T    G      3.1    26.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 806 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    802A  MET*     3.0    21.2    +      -       -      +
    803A  ASN*     3.6    21.1    -      -       -      +
    804A  LEU      3.2     0.2    -      -       -      -
    805A  ARG*     1.3    91.9    +      -       -      +
    807A  ASP*     1.3    63.3    +      -       -      +
    809A  ASN*     3.4     8.3    +      -       -      +
    810A  ARG*     3.0    22.9    +      -       -      +
     42T    U      4.2    14.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 807 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    803A  ASN      3.5     6.9    +      -       -      +
    804A  LEU*     3.2     8.5    +      -       +      +
    806A  ASP*     1.3    75.7    -      -       -      +
    808A  VAL*     1.3    61.4    +      -       -      +
    810A  ARG*     3.1     9.9    +      -       -      +
    811A  ALA*     2.8    27.9    +      -       -      +
    871A  TYR*     3.7    23.6    -      -       +      -
    872A  GLU*     2.5    29.4    -      -       -      +
    873A  HIS*     2.8    42.6    +      -       +      +
    876A  ILE*     3.9     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 808 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    804A  LEU*     3.4    20.9    -      -       +      +
    805A  ARG*     3.2     7.8    +      -       -      +
    807A  ASP*     1.3    76.9    -      -       -      +
    809A  ASN*     1.3    52.1    +      -       -      +
    811A  ALA*     2.8     7.6    +      -       -      +
    812A  LEU*     2.6    53.6    +      -       +      +
    829A  VAL*     4.2    24.5    -      -       +      -
    831A  ILE*     4.7     4.5    -      -       +      -
    853A  PHE*     3.8    39.7    -      -       +      -
    876A  ILE*     3.8    17.7    -      -       +      -
    878A  ILE*     5.0     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 809 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    805A  ARG*     2.9    48.4    +      -       -      +
    806A  ASP*     3.7     7.0    -      -       -      +
    808A  VAL*     1.3    77.9    -      -       -      +
    810A  ARG*     1.3    52.7    +      -       -      +
    812A  LEU*     3.6    23.3    -      -       -      +
    813A  GLU*     2.8    36.9    +      -       -      +
    816A  ARG*     4.9     0.4    +      -       -      +
    824A  SER*     5.8     1.4    -      -       -      -
    853A  PHE*     4.8     7.9    +      -       -      +
     41T    G      3.6    39.4    +      -       -      +
     42T    U      3.8     7.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 810 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    806A  ASP      3.0    15.0    +      -       -      +
    807A  ASP*     3.2    12.6    -      -       -      +
    809A  ASN*     1.3    72.7    -      -       -      +
    811A  ALA*     1.3    65.7    +      -       -      +
    813A  GLU*     3.2    10.8    +      -       -      +
    814A  THR*     3.0    52.0    +      -       -      +
    817A  ASN*     4.0     9.5    -      -       -      +
    871A  TYR*     3.7    21.3    -      -       +      +
     42T    U      3.6    42.9    +      -       -      -
     43T    G      3.8    15.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 811 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    807A  ASP      2.8     9.7    +      -       -      +
    808A  VAL      2.8     9.3    +      -       -      +
    810A  ARG*     1.3    76.9    -      -       -      +
    812A  LEU*     1.3    63.3    +      -       -      +
    814A  THR*     3.4     5.0    +      -       -      -
    815A  ALA*     3.2    23.0    +      -       -      +
    869A  THR*     5.5     0.2    -      -       -      +
    871A  TYR*     3.4    22.2    -      -       +      +
    876A  ILE*     3.6    22.0    -      -       +      +
    878A  ILE*     3.6    22.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 812 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    808A  VAL*     2.6    28.3    +      -       +      +
    809A  ASN*     3.6    29.6    -      -       -      +
    810A  ARG      3.2     0.2    -      -       -      -
    811A  ALA*     1.3    74.5    -      -       -      +
    813A  GLU*     1.3    56.3    +      -       -      +
    815A  ALA*     3.5     3.8    +      -       -      +
    816A  ARG*     2.8    42.7    +      -       -      +
    821A  ILE*     3.9     8.7    -      -       +      +
    824A  SER*     4.1    13.5    -      -       -      -
    827A  ALA*     3.7    27.4    -      -       +      -
    829A  VAL*     4.2     3.8    -      -       +      -
    853A  PHE      4.4     2.9    -      -       -      +
    855A  VAL*     3.8    20.6    -      -       +      -
    878A  ILE*     3.5    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 813 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    809A  ASN      2.8    12.2    +      -       -      +
    810A  ARG*     3.5    20.4    -      -       -      +
    812A  LEU*     1.3    71.1    -      -       -      +
    814A  THR*     1.3    66.3    +      -       -      +
    816A  ARG*     2.7    36.9    +      -       -      +
    817A  ASN*     2.8    46.1    +      -       -      +
     30T    C      4.6     2.3    +      -       -      +
     40T    G      4.2     0.2    +      -       -      -
     41T    G      2.6    51.5    +      -       -      +
     42T    U      2.9    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 814 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    810A  ARG*     3.0    30.9    +      -       -      +
    811A  ALA*     3.7    10.2    -      -       -      -
    813A  GLU*     1.3    76.6    -      -       -      +
    815A  ALA*     1.3    64.2    +      -       -      +
    817A  ASN*     3.1    17.8    +      -       -      +
    818A  GLU*     3.2    32.7    +      -       +      +
    869A  THR*     6.5     0.9    -      -       +      -
    871A  TYR*     4.9     4.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 815 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    811A  ALA      3.2    14.5    +      -       -      +
    812A  LEU      3.8     3.6    -      -       -      +
    814A  THR*     1.3    79.4    -      -       -      +
    816A  ARG*     1.3    59.1    +      -       -      +
    818A  GLU*     3.2    16.3    +      -       -      +
    820A  VAL*     3.1    38.4    +      -       +      +
    821A  ILE*     3.6     8.5    +      -       +      -
    878A  ILE*     3.7    30.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 816 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    809A  ASN*     4.9     0.4    +      -       -      +
    812A  LEU*     2.8    28.9    +      -       -      +
    813A  GLU*     2.7    43.5    +      -       -      +
    815A  ALA*     1.3    74.1    -      -       -      +
    817A  ASN*     1.3    66.3    +      -       -      +
    818A  GLU      3.0     1.8    -      -       -      -
    819A  LYS*     3.1    19.8    +      -       -      +
    821A  ILE*     3.5    24.1    -      -       +      +
    822A  GLY      3.0    21.4    +      -       -      -
    823A  LYS*     4.6     0.4    -      -       -      +
    824A  SER*     4.3    15.2    -      -       -      +
     30T    C      4.1    14.3    +      -       -      +
     31T    C      3.3    39.8    +      -       -      +
     40T    G      4.2     8.2    +      -       -      +
     41T    G      3.5    20.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 817 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    810A  ARG*     4.0     9.1    -      -       -      +
    813A  GLU*     2.8    41.2    +      -       -      +
    814A  THR*     3.1    11.6    +      -       -      +
    816A  ARG*     1.3    77.9    -      -       -      +
    818A  GLU*     1.3    58.6    +      -       +      +
    819A  LYS*     3.2    14.6    +      -       -      +
     30T    C      4.3    17.9    +      -       -      +
     42T    U      5.6     1.0    +      -       -      -
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Residues in contact with GLU 818 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    814A  THR*     3.2    28.9    +      -       -      +
    815A  ALA*     3.5    13.6    -      -       -      +
    816A  ARG      3.0     0.8    -      -       -      -
    817A  ASN*     1.3    79.0    -      -       +      +
    819A  LYS*     1.3    63.8    +      -       -      +
    820A  VAL*     2.8    30.8    +      -       +      +
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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