Contacts of the helix formed by residues 759 - 784 (chain A) in PDB entry 6CNC


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 GLU 759 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    742A  ILE*     5.0     1.2    -      -       -      +
    745A  PHE*     3.5    46.7    -      -       +      -
    758A  GLU*     1.3    76.3    -      -       +      +
    760A  GLN*     1.3    60.8    +      -       -      +
    761A  THR*     3.2     7.3    +      -       -      +
    762A  LEU*     3.3    19.0    -      -       +      +
    763A  GLU*     3.1    23.9    +      -       +      +
    840A  LYS*     3.5    35.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 760 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    755A  GLY*     5.1     4.9    -      -       -      +
    757A  ASN*     2.8    49.9    -      -       -      +
    758A  GLU      2.5    33.4    +      -       -      +
    759A  GLU*     1.3    76.7    -      -       -      +
    761A  THR*     1.3    61.0    +      -       -      +
    763A  GLU*     3.5    18.4    -      -       +      +
    764A  ALA*     2.9    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 761 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    750A  LEU*     5.8     3.4    -      -       +      -
    751A  GLU      3.2    23.3    -      -       -      +
    752A  THR*     3.7    25.8    -      -       +      +
    753A  GLN*     3.1    35.1    +      -       +      +
    755A  GLY*     4.8     7.3    +      -       -      -
    757A  ASN      4.3    11.7    +      -       -      -
    758A  GLU*     4.4     0.7    -      -       -      -
    759A  GLU      4.0     5.7    +      -       -      +
    760A  GLN*     1.3    77.7    -      -       -      +
    762A  LEU*     1.3    58.8    +      -       -      +
    764A  ALA*     3.8     2.9    -      -       -      +
    765A  LYS*     2.9    37.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 762 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    741A  LEU*     4.1    18.2    -      -       +      +
    742A  ILE*     4.8    13.2    -      -       +      -
    745A  PHE*     3.5    48.9    -      -       +      -
    750A  LEU*     3.7    23.1    -      -       +      +
    759A  GLU*     3.3    22.8    -      -       +      +
    761A  THR*     1.3    80.0    -      -       -      +
    763A  GLU*     1.3    66.1    +      -       +      +
    765A  LYS*     3.4    11.1    -      -       -      +
    766A  ILE*     2.9    38.7    +      -       +      +
    840A  LYS*     5.9     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 763 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    759A  GLU*     3.1    20.6    +      -       +      +
    760A  GLN*     3.6    19.5    -      -       +      +
    761A  THR      3.2     0.4    -      -       -      -
    762A  LEU*     1.3    81.9    -      -       +      +
    764A  ALA*     1.3    64.5    +      -       -      +
    766A  ILE*     3.3    10.2    -      -       -      +
    767A  GLY*     2.9    21.7    +      -       -      -
    821A  ASN*     5.4     4.2    +      -       -      +
    822A  ARG*     3.1    44.0    +      -       -      +
    840A  LYS*     6.0     0.9    -      -       -      +
    845A  LYS*     4.5    14.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 764 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    760A  GLN*     2.9    17.8    +      -       +      +
    761A  THR*     4.0     2.7    -      -       -      +
    763A  GLU*     1.3    81.5    +      -       -      +
    765A  LYS*     1.3    64.7    +      -       -      +
    767A  GLY*     3.0     4.3    +      -       -      +
    768A  GLY*     2.9    18.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 765 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    741A  LEU*     4.4    21.9    -      -       +      +
    750A  LEU*     5.0     5.3    -      -       -      +
    751A  GLU*     2.7    38.4    +      -       -      +
    753A  GLN*     3.3    37.6    -      -       -      +
    761A  THR*     2.9    28.1    +      -       -      +
    762A  LEU*     3.2    13.9    +      -       +      +
    764A  ALA*     1.3    73.6    -      -       -      +
    766A  ILE*     1.3    55.0    +      -       -      +
    768A  GLY*     2.7    24.1    +      -       -      -
    769A  LEU*     2.9    23.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 766 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    734A  ALA      5.4     1.1    -      -       -      +
    738A  CYS*     3.5    41.1    -      -       +      -
    741A  LEU*     4.0    11.5    -      -       +      +
    762A  LEU*     2.9    27.4    +      -       +      +
    763A  GLU*     3.3    11.4    -      -       -      +
    765A  LYS*     1.3    72.9    -      -       -      +
    767A  GLY*     1.3    60.6    +      -       -      +
    769A  LEU*     2.8    31.7    +      -       +      +
    770A  LEU*     2.9    44.7    +      -       +      +
    822A  ARG*     3.4    20.6    -      -       -      +
    840A  LYS      5.8     0.9    -      -       -      +
    842A  PRO*     4.5     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 767 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    763A  GLU      2.9    19.1    +      -       -      -
    764A  ALA*     3.2     8.7    -      -       -      -
    765A  LYS      3.0     1.0    -      -       -      -
    766A  ILE*     1.3    77.9    -      -       -      +
    768A  GLY*     1.3    56.9    +      -       -      +
    770A  LEU*     5.1     1.5    -      -       -      +
    771A  SER*     4.2    15.9    +      -       -      -
    815A  GLN*     5.4     6.4    -      -       -      +
    822A  ARG*     4.8    13.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 768 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    764A  ALA      2.9     7.3    +      -       -      -
    765A  LYS      2.7    11.7    +      -       -      -
    767A  GLY*     1.3    72.4    -      -       -      -
    769A  LEU*     1.3    61.9    +      -       -      +
    770A  LEU      3.4     0.2    -      -       -      -
    771A  SER*     3.9     4.4    -      -       -      -
    772A  LYS*     2.9    31.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 769 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    734A  ALA*     4.9     4.5    -      -       +      +
    737A  LYS*     3.5    45.5    -      -       +      +
    741A  LEU*     4.4    14.8    -      -       +      -
    765A  LYS*     2.9    32.3    +      -       +      +
    766A  ILE*     2.8    24.2    +      -       +      +
    768A  GLY*     1.3    80.7    -      -       -      +
    770A  LEU*     1.3    57.9    +      -       +      +
    772A  LYS*     3.2    14.6    +      -       +      +
    773A  VAL*     2.9    33.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 770 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    731A  VAL*     5.7     0.4    -      -       +      -
    734A  ALA*     3.7    29.2    -      -       +      +
    735A  TYR*     5.3     3.4    -      -       +      -
    766A  ILE*     2.9    35.9    +      -       +      +
    767A  GLY      5.1     0.4    -      -       -      +
    769A  LEU*     1.3    73.2    -      -       -      +
    771A  SER*     1.3    61.0    +      -       -      +
    773A  VAL*     3.9     2.0    -      -       +      +
    774A  ARG*     2.9    29.7    +      -       -      +
    814A  GLY      6.3     0.2    -      -       -      -
    815A  GLN*     3.2    47.1    -      -       +      +
    822A  ARG*     4.6     2.7    -      -       -      +
    842A  PRO*     4.0    19.5    -      -       +      -
    847A  PHE*     3.8    31.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 771 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    767A  GLY      4.2    15.1    +      -       -      -
    768A  GLY*     3.8     4.0    +      -       -      -
    769A  LEU      3.4     0.2    -      -       -      -
    770A  LEU*     1.3    76.8    -      -       -      +
    772A  LYS*     1.3    59.5    +      -       -      +
    774A  ARG*     3.5    17.5    +      -       -      +
    775A  GLU*     2.9    32.4    +      -       -      +
    814A  GLY      6.5     0.4    -      -       -      -
    815A  GLN*     5.2     7.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 772 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    737A  LYS*     5.0    14.6    -      -       -      +
    768A  GLY      2.9    23.0    +      -       -      +
    769A  LEU*     3.2    18.4    -      -       +      +
    770A  LEU      3.2     0.2    -      -       -      -
    771A  SER*     1.3    78.7    -      -       -      +
    773A  VAL*     1.3    62.1    +      -       +      +
    775A  GLU*     3.6     7.2    +      -       -      +
    776A  GLU*     2.9    34.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 773 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    730A  LEU      3.5    25.8    -      -       -      +
    731A  VAL*     3.9    17.7    -      -       +      +
    733A  ILE*     3.7    20.2    -      -       +      -
    734A  ALA*     3.7    16.4    -      -       +      -
    737A  LYS*     5.2     8.1    -      -       +      -
    769A  LEU*     2.9    22.6    +      -       +      +
    770A  LEU*     4.2     2.5    -      -       +      +
    772A  LYS*     1.3    76.4    -      -       +      +
    774A  ARG*     1.3    65.9    +      -       -      +
    776A  GLU*     3.1    20.6    -      -       -      +
    777A  VAL*     2.9    33.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 774 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    731A  VAL*     6.3     0.2    -      -       -      -
    770A  LEU      2.9    20.5    +      -       -      +
    771A  SER*     3.5    16.2    +      -       -      +
    773A  VAL*     1.3    75.2    -      -       -      +
    775A  GLU*     1.3    66.4    +      -       -      +
    777A  VAL*     2.8    23.3    +      -       -      +
    778A  GLY      3.3     6.6    +      -       -      -
    804A  LEU*     3.2    38.0    +      -       -      +
    807A  SER*     4.7     8.4    +      -       -      +
    808A  GLN*     3.0    39.3    -      -       -      +
    812A  VAL*     4.2    26.2    +      -       +      +
    813A  VAL*     3.9     6.5    -      -       -      +
    814A  GLY*     3.6    37.6    +      -       -      +
    847A  PHE*     5.5     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 775 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    771A  SER*     2.9    21.6    +      -       -      +
    772A  LYS*     4.0     5.7    -      -       -      +
    774A  ARG*     1.3    81.8    -      -       -      +
    776A  GLU*     1.3    67.4    +      -       -      +
    778A  GLY*     2.9    17.3    +      -       -      +
    779A  ASP*     3.4     5.2    +      -       -      +
    807A  SER*     6.0     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 776 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    730A  LEU*     4.2    20.9    -      -       +      +
    733A  ILE*     4.6     6.3    -      -       -      +
    772A  LYS*     2.9    22.6    +      -       +      +
    773A  VAL*     3.1    37.3    -      -       -      +
    774A  ARG      3.1     0.2    -      -       -      -
    775A  GLU*     1.3    82.3    +      -       -      +
    777A  VAL*     1.3    54.7    +      -       +      +
    779A  ASP*     2.9    32.1    +      -       +      +
    780A  VAL*     3.9     4.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 777 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    723A  LEU*     4.0     9.0    -      -       +      -
    727A  LYS*     4.7     8.1    -      -       +      -
    730A  LEU*     3.7    42.2    -      -       +      -
    731A  VAL*     4.4    10.1    -      -       +      -
    773A  VAL*     3.1    17.0    -      -       +      +
    774A  ARG      2.8    13.8    +      -       -      +
    776A  GLU*     1.3    73.2    -      -       +      +
    778A  GLY*     1.3    57.1    +      -       -      +
    780A  VAL*     3.6     2.2    -      -       -      +
    781A  CYS*     2.9    29.4    +      -       -      +
    811A  ALA*     3.4    25.4    -      -       +      -
    812A  VAL*     4.2    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 778 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    774A  ARG      3.3     6.0    +      -       -      -
    775A  GLU*     2.9    13.9    +      -       -      -
    777A  VAL*     1.3    76.0    -      -       -      +
    779A  ASP*     1.3    66.2    +      -       -      +
    781A  CYS*     3.2    15.0    +      -       -      +
    782A  ILE*     3.3    19.8    +      -       -      +
    803A  THR*     4.4     7.2    +      -       -      -
    807A  SER*     3.9    14.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 779 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    775A  GLU*     3.4     7.2    +      -       -      +
    776A  GLU*     2.9    18.5    +      -       +      +
    778A  GLY*     1.3    79.3    -      -       -      +
    780A  VAL*     1.3    68.9    +      -       +      +
    781A  CYS      3.1     0.2    +      -       -      -
    782A  ILE*     3.8     3.4    -      -       -      +
    783A  ASN*     3.3    32.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 780 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    723A  LEU*     3.6    25.7    -      -       +      +
    726A  LYS*     4.3    15.0    -      -       +      -
    730A  LEU*     3.7    26.9    -      -       +      -
    776A  GLU      4.4     1.8    -      -       -      +
    777A  VAL*     3.6     9.0    -      -       -      +
    779A  ASP*     1.3    83.5    -      -       +      +
    781A  CYS*     1.3    66.0    +      -       -      +
    782A  ILE      3.6     0.2    -      -       -      -
    783A  ASN*     4.2     2.2    -      -       -      -
    784A  GLU*     3.7    50.4    -      -       -      +
    785A  LEU      4.6     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 781 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    723A  LEU*     3.5    21.1    -      -       -      +
    777A  VAL      2.9    21.7    +      -       -      +
    778A  GLY*     3.4    12.1    -      -       -      +
    779A  ASP      3.0     0.4    -      -       -      -
    780A  VAL*     1.3    79.9    -      -       -      +
    782A  ILE*     1.3    60.5    +      -       -      +
    785A  LEU*     3.1    29.6    -      -       -      +
    803A  THR*     5.3     2.7    -      -       -      +
    806A  VAL*     5.2     4.9    -      -       -      -
    807A  SER*     4.0    20.2    -      -       -      -
    810A  VAL*     4.4     8.1    -      -       -      -
    811A  ALA*     3.7    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 782 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632A  VAL*     5.8     6.3    -      -       +      -
    778A  GLY      3.5    14.6    -      -       -      +
    779A  ASP*     3.8     4.5    -      -       -      +
    781A  CYS*     1.3    78.4    -      -       -      +
    783A  ASN*     1.3    73.6    +      -       +      +
    785A  LEU*     3.4    22.0    +      -       +      +
    792A  LEU*     4.7    18.7    -      -       +      +
    796A  THR*     4.0    20.4    -      -       -      +
    803A  THR*     4.4    25.6    -      -       +      +
    806A  VAL*     6.5     0.4    -      -       +      -
     19H  ARG*     5.8     7.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 783 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    779A  ASP*     3.3    27.2    +      -       -      +
    780A  VAL*     4.7     0.7    -      -       -      -
    782A  ILE*     1.3    85.9    -      -       +      +
    784A  GLU*     1.3    66.9    +      -       +      +
    785A  LEU      3.2     8.1    +      -       -      +
     19H  ARG*     5.9     2.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 784 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    722A  ASP*     3.1    42.7    -      -       -      +
    723A  LEU      4.5     0.7    +      -       -      -
    726A  LYS*     3.6    26.3    +      -       -      +
    780A  VAL*     3.7    41.1    +      -       -      +
    782A  ILE      3.5     0.2    -      -       -      -
    783A  ASN*     1.3    81.1    -      -       +      +
    785A  LEU*     1.3    61.9    +      -       -      +
----------------------------------------------------------
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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