Contacts of the helix formed by residues 686 - 712 (chain A) in PDB entry 3IAY


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 686 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    684A  GLU*     2.5    18.3    +      -       -      +
    685A  LYS*     1.3    73.2    -      -       -      +
    687A  PRO*     1.3    69.9    -      -       -      +
    688A  PHE*     2.4    40.4    +      -       -      +
    689A  LYS*     2.7    18.8    +      -       +      +
    690A  ARG*     2.9    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 687 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    685A  LYS      3.2     7.8    -      -       -      +
    686A  ASP*     1.3    91.6    -      -       -      +
    688A  PHE*     1.3    63.7    +      -       +      +
    690A  ARG*     3.6    10.7    +      -       +      +
    691A  ASP*     3.1    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 688 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    485A  HIS      5.4     1.1    -      -       -      -
    486A  PHE*     3.0    50.7    -      +       +      -
    530A  LYS*     3.5    44.4    -      -       +      -
    531A  LEU*     4.0    13.5    -      -       +      -
    686A  ASP*     2.4    25.4    +      -       -      +
    687A  PRO*     1.3    74.8    -      -       +      +
    689A  LYS*     1.3    68.9    +      -       +      -
    691A  ASP*     3.0    25.6    -      -       +      +
    692A  VAL*     3.2    14.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 689 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532A  MET*     6.0     1.3    -      -       -      +
    684A  GLU*     3.7    26.0    -      -       +      +
    686A  ASP*     2.7    22.6    +      -       +      +
    688A  PHE*     1.3    80.7    -      -       +      +
    690A  ARG*     1.3    57.9    +      -       -      +
    692A  VAL*     3.1     8.6    +      -       -      +
    693A  LEU*     2.8    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 690 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    681A  LEU*     3.2    58.6    +      -       +      +
    682A  ARG*     4.1    13.7    +      -       -      +
    684A  GLU*     2.7    34.7    +      -       +      +
    685A  LYS      3.8    12.8    -      -       -      -
    686A  ASP      2.9    15.2    +      -       -      +
    687A  PRO*     3.7     9.2    -      -       +      +
    688A  PHE      3.3     0.2    -      -       -      -
    689A  LYS*     1.3    76.3    -      -       -      +
    691A  ASP*     1.3    51.5    +      -       -      +
    693A  LEU*     3.2     1.7    +      -       -      -
    694A  ASN*     2.7    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 691 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472A  TYR*     4.1    19.6    +      -       -      -
    485A  HIS*     5.8     2.7    +      -       -      -
    486A  PHE*     5.3     6.6    -      -       +      -
    687A  PRO      3.1    14.5    +      -       -      +
    688A  PHE*     3.0    19.5    -      -       +      +
    690A  ARG*     1.3    75.8    -      -       -      +
    692A  VAL*     1.3    60.6    +      -       +      +
    694A  ASN*     2.8    24.3    +      -       -      +
    695A  GLY      3.1    10.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 692 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472A  TYR*     3.8    20.5    +      -       -      +
    486A  PHE*     6.1     0.7    -      -       +      -
    530A  LYS      3.7     6.1    -      -       -      +
    531A  LEU*     3.2    33.0    -      -       +      +
    532A  MET*     3.4    24.7    -      -       +      -
    536A  ASN*     4.2     3.7    +      -       -      +
    688A  PHE*     3.3    40.8    -      -       +      +
    689A  LYS*     3.1     8.0    +      -       -      +
    691A  ASP*     1.3    75.4    -      -       +      +
    693A  LEU*     1.3    62.6    +      -       -      +
    695A  GLY*     3.1     4.0    +      -       -      -
    696A  ARG*     3.1    19.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 693 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532A  MET*     3.9    22.9    -      -       +      -
    677A  ALA*     4.8     3.5    -      -       -      +
    680A  ASP*     3.5    32.1    -      -       +      +
    681A  LEU*     3.9    18.2    -      -       +      +
    684A  GLU*     3.7    22.4    -      -       +      +
    689A  LYS*     2.8    24.2    +      -       +      +
    690A  ARG*     3.6     7.0    -      -       -      +
    692A  VAL*     1.3    72.7    -      -       -      +
    694A  ASN*     1.3    62.2    +      -       -      +
    696A  ARG*     3.4    33.2    +      -       -      +
    697A  GLN*     3.1    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 694 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    681A  LEU*     3.7    16.8    -      -       +      +
    690A  ARG      2.7    17.5    +      -       -      +
    691A  ASP*     2.8    15.5    +      -       -      +
    693A  LEU*     1.3    74.3    -      -       -      +
    695A  GLY*     1.3    53.7    +      -       -      +
    697A  GLN*     3.0    26.5    +      -       -      +
    698A  LEU*     3.0    53.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 695 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471A  GLU*     4.3    16.9    -      -       -      +
    472A  TYR*     5.4     8.7    -      -       -      -
    691A  ASP      3.1    10.3    +      -       -      -
    692A  VAL*     3.1     4.2    +      -       -      -
    694A  ASN*     1.3    73.2    -      -       -      +
    696A  ARG*     1.3    55.4    +      -       -      +
    698A  LEU*     3.2    10.4    +      -       -      +
    699A  ALA*     2.7    37.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 696 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532A  MET*     4.8     0.9    -      -       -      +
    536A  ASN*     3.7    41.6    +      -       +      +
    539A  GLU*     3.0    38.4    +      -       -      +
    676A  ARG*     4.6     6.1    -      -       -      +
    677A  ALA*     3.8    27.3    -      -       +      +
    680A  ASP*     2.7    34.6    +      -       -      +
    692A  VAL      3.1     8.9    +      -       -      +
    693A  LEU*     3.5    31.3    -      -       -      +
    694A  ASN      3.3     0.2    -      -       -      -
    695A  GLY*     1.3    77.5    -      -       -      +
    697A  GLN*     1.3    61.8    +      -       -      +
    699A  ALA*     3.3     7.0    +      -       -      +
    700A  LEU*     3.2    22.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 697 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674A  ARG*     2.8    48.9    +      -       +      +
    677A  ALA*     3.9    21.3    -      -       +      +
    678A  LYS*     3.7    24.6    -      -       +      +
    681A  LEU*     4.5     7.6    -      -       +      -
    693A  LEU      3.1    12.9    +      -       -      +
    694A  ASN*     3.0    27.6    +      -       -      +
    696A  ARG*     1.3    79.4    -      -       -      +
    698A  LEU*     1.3    94.1    +      -       -      +
    700A  LEU*     3.2     2.7    +      -       -      +
    701A  LYS*     3.0    17.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 698 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674A  ARG*     4.9     0.9    -      -       -      +
    694A  ASN*     3.0    44.1    +      -       -      +
    695A  GLY*     3.2     9.6    +      -       -      +
    697A  GLN*     1.3   115.3    -      -       -      +
    699A  ALA*     1.3    66.3    +      -       -      +
    701A  LYS*     3.1    22.6    +      -       +      +
    702A  ILE*     2.9    33.9    +      -       +      +
    986A  DCP      5.8     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 699 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471A  GLU*     3.8    22.0    -      -       -      +
    537A  TYR*     6.1     1.8    -      -       +      -
    540A  MET*     3.9    18.8    -      -       +      +
    556A  GLN*     5.6     0.9    +      -       -      -
    559A  LYS*     5.1     0.3    +      -       -      -
    695A  GLY      2.7    21.3    +      -       -      +
    696A  ARG*     3.3     7.6    +      -       -      +
    698A  LEU*     1.3    73.4    -      -       -      +
    700A  LEU*     1.3    57.8    +      -       -      +
    702A  ILE*     3.4    11.0    +      -       -      +
    703A  SER*     3.0    29.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 700 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    539A  GLU*     4.3    20.0    -      -       -      +
    540A  MET*     4.1    27.1    -      -       +      -
    543A  VAL*     4.8    14.1    -      -       +      -
    670A  LEU*     4.5    14.4    -      -       +      +
    673A  ALA*     3.8    22.2    -      -       +      +
    674A  ARG*     3.8    37.4    -      -       +      +
    677A  ALA*     4.4     8.3    -      -       +      -
    696A  ARG*     3.2    13.6    +      -       +      +
    697A  GLN      3.2     7.1    +      -       -      +
    698A  LEU      3.1     0.8    -      -       -      -
    699A  ALA*     1.3    75.2    -      -       -      +
    701A  LYS*     1.3    60.2    +      -       -      +
    703A  SER*     3.3     5.8    +      -       -      +
    704A  ALA*     3.1    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 701 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674A  ARG*     3.7    27.5    -      -       -      +
    697A  GLN      3.0    13.5    +      -       -      +
    698A  LEU*     3.4    22.8    -      -       +      +
    700A  LEU*     1.3    75.3    -      -       -      +
    702A  ILE*     1.3    69.5    +      -       +      +
    704A  ALA*     3.1     7.8    +      -       -      +
    705A  ASN*     2.9    38.0    +      -       -      +
    986A  DCP      2.8    73.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 702 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    446A  TYR*     5.7     0.2    -      -       -      +
    556A  GLN*     3.5    25.8    -      -       -      +
    698A  LEU*     2.9    27.3    +      -       +      +
    699A  ALA*     3.8     8.5    -      -       -      +
    701A  LYS*     1.3    83.2    -      -       +      +
    703A  SER*     1.3    53.5    +      -       -      +
    705A  ASN*     3.7     6.3    -      -       -      +
    706A  SER*     2.8    42.8    +      -       -      +
    986A  DCP      4.5    14.8    -      -       -      +
      4T    G      4.0    16.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 703 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540A  MET*     3.5    11.1    -      -       -      +
    544A  THR*     5.2     1.1    -      -       -      -
    556A  GLN*     4.1     9.9    -      -       -      -
    559A  LYS*     3.0    29.1    +      -       -      +
    560A  VAL*     5.0     1.9    -      -       -      +
    563A  GLN*     5.7     1.4    +      -       -      -
    670A  LEU*     3.9    19.7    -      -       -      +
    699A  ALA      3.0    16.1    +      -       -      -
    700A  LEU*     3.4    12.3    -      -       -      -
    701A  LYS      3.1     0.2    -      -       -      -
    702A  ILE*     1.3    76.2    -      -       -      +
    704A  ALA*     1.3    61.9    +      -       -      +
    706A  SER*     3.4     9.9    +      -       -      -
    707A  VAL*     3.4    17.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 704 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    614A  PRO*     4.1    19.5    -      -       +      +
    667A  LEU*     3.5    15.5    -      -       +      +
    670A  LEU*     3.8    22.6    -      -       +      +
    671A  ILE*     4.7    11.0    -      -       +      +
    674A  ARG*     6.4     0.4    -      -       -      -
    700A  LEU      3.1    13.2    +      -       -      +
    701A  LYS*     3.1     9.8    +      -       -      +
    703A  SER*     1.3    74.9    -      -       -      +
    705A  ASN*     1.3    66.3    +      -       -      +
    707A  VAL*     3.1    19.8    +      -       -      +
    708A  TYR*     3.7     2.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 705 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    613A  TYR*     4.5     0.2    -      -       -      +
    614A  PRO*     3.3    28.3    -      -       -      +
    701A  LYS*     2.9    33.3    +      -       -      +
    702A  ILE*     4.0     4.9    -      -       -      +
    704A  ALA*     1.3    76.6    -      -       -      +
    706A  SER*     1.3    57.8    +      -       -      +
    708A  TYR*     3.2    10.4    +      -       -      +
    709A  GLY      2.9    20.8    +      -       -      -
    986A  DCP      3.4    71.6    +      -       +      +
      4T    G      3.2    11.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 706 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    556A  GLN*     3.3    42.3    -      -       -      +
    560A  VAL*     3.8     8.2    -      -       -      +
    702A  ILE*     2.8    22.8    +      -       -      +
    703A  SER      3.5     7.4    -      -       -      -
    704A  ALA      3.1     0.4    -      -       -      -
    705A  ASN*     1.3    76.5    -      -       -      +
    707A  VAL*     1.3    58.1    +      -       -      +
    709A  GLY      3.6     0.6    -      -       -      -
    710A  PHE*     2.8    29.6    +      -       -      +
      4T    G      3.5    26.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 707 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    560A  VAL*     4.1    24.2    -      -       +      -
    563A  GLN*     5.1     2.0    -      -       -      +
    617A  MET*     4.3    10.3    -      -       +      -
    663A  LEU*     4.2    26.5    -      -       +      -
    666A  ILE*     4.0    15.7    -      -       +      -
    667A  LEU*     3.8    17.5    -      -       +      -
    670A  LEU*     4.0    18.8    -      -       +      -
    703A  SER      3.4    13.4    +      -       -      +
    704A  ALA      3.1    10.2    +      -       -      +
    706A  SER*     1.3    73.5    -      -       -      +
    708A  TYR*     1.3    69.1    +      -       -      +
    710A  PHE*     3.5    11.1    +      -       -      +
    711A  THR*     3.5    14.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 708 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587A  TYR*     2.8    26.5    +      -       -      -
    613A  TYR*     3.5    39.4    -      +       +      -
    614A  PRO*     5.6     1.1    -      -       +      -
    617A  MET*     3.9    22.0    -      -       -      -
    704A  ALA      3.7     2.9    +      -       -      +
    705A  ASN*     3.2     9.5    +      -       -      +
    707A  VAL*     1.3    79.5    -      -       -      +
    709A  GLY*     1.3    71.6    +      -       -      +
    711A  THR*     2.7    26.8    +      -       -      -
    712A  GLY      3.4     3.1    +      -       -      -
    724A  SER*     3.6    27.8    -      -       -      -
    727A  VAL*     3.9    22.0    -      -       +      -
    728A  THR*     3.2    18.1    -      -       +      +
    986A  DCP      3.8     5.2    -      -       +      -
      4T    G      3.4    22.2    -      -       -      -
      5T    G      3.9    18.5    +      -       -      +
      6T    T      4.7     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 709 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    705A  ASN      2.9    11.7    +      -       -      -
    706A  SER      3.4     0.6    +      -       -      -
    707A  VAL      3.3     0.4    -      -       -      -
    708A  TYR*     1.3    78.5    -      -       -      +
    710A  PHE*     1.3    61.7    +      -       -      +
    712A  GLY      2.9    13.2    +      -       -      -
    713A  ALA*     3.0    14.9    +      -       -      +
      4T    G      3.4    33.0    -      -       -      -
      5T    G      3.5    16.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 710 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    557A  GLN*     3.6    39.0    -      -       +      -
    560A  VAL*     3.7    27.8    -      -       +      -
    561A  VAL*     3.9    22.9    -      -       +      -
    564A  LEU*     4.2    17.5    -      -       +      -
    624A  TYR*     3.2    29.4    -      +       -      -
    663A  LEU*     6.4     0.4    -      -       +      -
    706A  SER      2.8    21.9    +      -       -      +
    707A  VAL      3.5     7.2    -      -       -      +
    708A  TYR      3.2     0.2    -      -       -      -
    709A  GLY*     1.3    71.6    -      -       -      +
    711A  THR*     1.3    62.8    +      -       +      +
    713A  ALA*     3.2    21.8    +      -       -      +
    718A  LEU*     3.8    32.7    +      -       +      +
      1T    T      4.0    15.5    -      +       +      -
      4T    G      4.2     3.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 711 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617A  MET*     4.7     1.3    -      -       +      -
    624A  TYR*     3.6    24.0    -      -       +      +
    663A  LEU*     3.7    25.6    -      -       +      -
    707A  VAL      3.6    12.8    -      -       -      +
    708A  TYR*     2.7    18.9    +      -       -      -
    710A  PHE*     1.3    78.5    -      -       +      +
    712A  GLY*     1.3    56.8    +      -       -      +
    713A  ALA      3.4     0.2    -      -       -      -
    719A  PRO*     3.5     3.2    -      -       -      +
    720A  CYS      2.8    44.8    +      -       -      +
    721A  LEU*     3.7     2.1    -      -       -      +
    723A  ILE*     3.7    15.2    -      -       +      +
    724A  SER*     3.4    18.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 712 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587A  TYR*     3.8    19.9    -      -       -      -
    708A  TYR      3.4     2.0    +      -       -      -
    709A  GLY      2.9    10.6    +      -       -      -
    711A  THR*     1.3    82.0    +      -       -      +
    713A  ALA*     1.3    55.8    +      -       -      +
    714A  THR*     3.4     8.8    +      -       -      +
    721A  LEU*     4.0     7.4    -      -       -      +
    724A  SER*     3.5    20.6    -      -       -      -
      5T    G      3.5    15.4    -      -       -      +
      6T    T      4.7     1.2    +      -       -      -
----------------------------------------------------------
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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