Contacts of the helix formed by residues 686 - 709 (chain A) in PDB entry 6CNB


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 GLY 686 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    681A  ILE      4.5     0.2    -      -       -      +
    682A  LEU*     3.0    22.4    +      -       -      +
    684A  ASP      3.5     2.4    +      -       -      -
    685A  TYR*     1.3    84.9    -      -       -      +
    687A  PRO*     1.3    77.3    -      -       -      +
    688A  GLN      3.4     2.7    +      -       -      -
    689A  GLU*     3.5     8.3    +      -       -      +
    690A  ALA      3.6     5.7    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    538A  LYS*     3.0    39.9    -      -       +      +
    539A  ASN*     3.1    26.9    -      -       -      +
    541A  LEU*     5.3     1.1    -      -       +      -
    682A  LEU*     3.2    19.0    -      -       +      -
    686A  GLY*     1.3    81.7    -      -       -      +
    688A  GLN*     1.3    62.1    +      -       +      +
    690A  ALA*     2.5    27.6    +      -       +      -
    691A  ALA*     3.0    12.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 688 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    538A  LYS*     3.3    34.3    -      -       +      +
    686A  GLY      3.4     1.2    +      -       -      -
    687A  PRO*     1.3    81.9    -      -       +      +
    689A  GLU*     1.3    59.6    +      -       -      +
    691A  ALA*     4.5     1.6    -      -       -      +
    692A  ASN*     3.4    24.7    +      -       -      +
    695A  ASN*     6.1     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 689 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    614A  ILE      4.7     1.2    -      -       -      +
    620A  SER*     4.7     6.8    -      -       -      -
    621A  PRO*     5.3    10.5    -      -       +      +
    622A  VAL*     3.4    38.5    -      -       +      +
    681A  ILE*     4.4     6.5    -      -       +      -
    685A  TYR*     4.5    13.7    +      -       +      +
    686A  GLY      3.5     8.8    +      -       -      +
    687A  PRO      2.7     4.0    +      -       -      -
    688A  GLN*     1.3    76.3    -      -       -      +
    690A  ALA*     1.3    68.7    +      -       -      +
    692A  ASN*     3.0    21.3    +      -       -      +
    693A  ALA*     3.0    18.7    +      -       +      +
    696A  ARG*     4.6    12.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 690 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541A  LEU*     4.3    11.7    -      -       +      -
    678A  PHE*     4.4     8.0    -      -       -      +
    681A  ILE*     3.8    14.0    -      -       +      +
    682A  LEU*     3.7    37.7    -      -       +      +
    686A  GLY      3.6     2.0    +      -       -      -
    687A  PRO*     2.5    16.5    +      -       +      +
    689A  GLU*     1.3    72.3    -      -       -      +
    691A  ALA*     1.3    55.7    +      -       -      +
    693A  ALA*     2.7    32.8    +      -       -      +
    694A  MET*     3.2     9.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 691 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389A  ILE*     4.1    20.8    -      -       +      +
    390A  ASP*     5.1     1.3    -      -       -      +
    537A  VAL*     6.3     0.2    -      -       +      -
    538A  LYS*     3.9    31.6    -      -       +      -
    541A  LEU*     4.5     6.0    -      -       +      +
    687A  PRO      3.0     7.6    +      -       -      +
    688A  GLN*     4.8     1.8    -      -       -      +
    690A  ALA*     1.3    76.5    -      -       -      +
    692A  ASN*     1.3    57.2    +      -       -      +
    694A  MET*     3.9    16.0    -      -       +      +
    695A  ASN*     2.9    37.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 692 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    588A  GLU*     5.0     0.3    -      -       -      +
    688A  GLN*     3.4    23.9    +      -       -      +
    689A  GLU*     3.0    29.5    +      -       -      +
    690A  ALA      3.0     0.6    -      -       -      -
    691A  ALA*     1.3    74.2    -      -       -      +
    693A  ALA*     1.3    67.0    +      -       -      +
    695A  ASN*     3.1    14.0    +      -       -      +
    696A  ARG*     3.1    50.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 693 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    613A  LEU*     4.1    11.0    -      -       +      +
    614A  ILE*     5.8     4.3    -      -       +      +
    678A  PHE*     3.6    24.2    -      -       +      -
    681A  ILE*     4.2    16.6    -      -       +      -
    689A  GLU*     3.0    10.7    +      -       +      +
    690A  ALA      2.7    15.5    +      -       -      +
    692A  ASN*     1.3    69.1    -      -       -      +
    694A  MET*     1.3    54.8    +      -       -      +
    696A  ARG*     2.7    39.7    +      -       -      +
    697A  MET      2.9     9.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 694 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389A  ILE*     3.5    31.0    -      -       +      -
    501A  ASN*     6.1     0.2    -      -       -      -
    503A  CYS*     4.8    12.8    -      -       -      -
    541A  LEU*     3.4    33.9    -      -       +      -
    551A  ILE*     3.8    28.7    -      -       +      +
    552A  ALA*     4.1     8.7    -      -       -      -
    678A  PHE*     3.3    42.2    -      -       +      -
    690A  ALA*     3.2     4.6    +      -       +      +
    691A  ALA*     3.9    10.1    -      -       -      +
    693A  ALA*     1.3    77.7    -      -       -      +
    695A  ASN*     1.3    63.8    +      -       -      +
    697A  MET*     3.1    10.3    +      -       +      +
    698A  ALA*     2.9    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 695 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  SER*     2.3    33.2    +      -       -      +
    389A  ILE*     2.5    33.9    +      -       -      +
    501A  ASN*     4.4     1.4    +      -       -      +
    688A  GLN*     6.1     0.8    -      -       -      +
    691A  ALA*     2.9    25.1    +      -       -      +
    692A  ASN*     3.3    14.2    +      -       -      +
    694A  MET*     1.3    74.1    -      -       -      +
    696A  ARG*     1.3    65.5    +      -       +      +
    698A  ALA*     3.3     6.2    +      -       -      +
    699A  LYS*     3.0    33.5    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    583A  MET*     3.4    30.5    -      -       +      +
    584A  SER*     4.6     5.8    -      -       -      -
    588A  GLU*     2.8    32.1    +      -       -      -
    613A  LEU*     3.3    30.6    +      -       +      -
    614A  ILE      4.3     2.4    +      -       -      -
    616A  PRO*     3.1    42.2    -      -       -      +
    617A  ASN*     5.7     2.2    -      -       -      +
    620A  SER*     5.7     1.6    -      -       -      -
    689A  GLU*     4.6    10.3    +      -       -      -
    692A  ASN*     3.4    37.6    +      -       -      +
    693A  ALA*     2.7    17.2    +      -       -      +
    695A  ASN*     1.3    70.6    -      -       +      +
    697A  MET*     1.3    65.5    +      -       -      +
    699A  LYS*     3.3     1.4    +      -       -      -
    700A  LEU*     2.9    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 697 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    503A  CYS*     5.9     1.6    -      -       -      -
    553A  ALA*     4.7    12.1    -      -       +      -
    557A  PHE*     4.6    11.2    -      -       +      +
    561A  SER*     3.0    23.3    -      -       -      +
    610A  PHE*     3.4    37.7    -      -       +      -
    613A  LEU*     3.7    12.0    -      -       +      +
    669A  LEU*     3.6    16.6    -      -       +      -
    678A  PHE*     3.7    33.2    -      -       +      -
    693A  ALA      2.9     6.1    +      -       -      -
    694A  MET*     3.2    10.1    -      -       +      +
    696A  ARG*     1.3    73.8    -      -       -      +
    698A  ALA*     1.3    65.1    +      -       -      +
    700A  LEU*     2.9     8.0    +      -       -      +
    701A  CYS*     2.9    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 698 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385A  PRO*     4.0    19.5    -      -       -      +
    501A  ASN*     4.1    12.1    -      -       -      +
    503A  CYS*     5.1     1.3    -      -       -      -
    557A  PHE*     3.4    34.8    -      -       +      -
    694A  MET      2.9    14.3    +      -       -      +
    695A  ASN*     3.5     7.6    -      -       -      +
    697A  MET*     1.3    75.1    -      -       -      +
    699A  LYS*     1.3    59.9    +      -       -      +
    700A  LEU      2.8     7.1    +      -       -      -
    702A  ALA*     3.0    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 699 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385A  PRO      4.5     2.5    -      -       -      +
    386A  ASN*     3.7    46.8    +      -       -      +
    387A  LEU      5.7     0.2    -      -       -      +
    388A  SER*     5.9     1.8    -      -       -      +
    582A  MET      3.1    18.5    -      -       -      +
    583A  MET*     3.9    12.3    -      -       -      +
    584A  SER*     4.6     1.8    -      -       -      +
    585A  ASP*     3.2    51.0    +      -       -      +
    695A  ASN*     3.0    30.1    +      -       +      +
    696A  ARG*     3.6     0.7    -      -       -      -
    698A  ALA*     1.3    71.6    -      -       -      +
    700A  LEU*     1.3    58.1    +      -       -      +
    702A  ALA*     4.7     4.3    -      -       -      -
    703A  ARG*     3.6    21.3    -      -       -      +
     93K  ILE      6.1     0.2    -      -       -      -
     94K  PRO*     5.2     5.6    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    561A  SER*     6.2     0.2    -      -       -      +
    564A  ILE*     3.9    22.7    -      -       +      -
    579A  LEU*     4.1    31.2    -      -       +      +
    582A  MET*     4.7     3.8    -      -       +      -
    583A  MET*     3.9    37.9    -      -       +      +
    609A  VAL*     5.2    10.8    -      -       +      +
    610A  PHE*     5.1    15.5    -      -       +      -
    613A  LEU*     5.5     2.0    -      -       +      -
    696A  ARG      2.9    17.8    +      -       -      +
    697A  MET*     2.9     6.3    +      -       -      +
    698A  ALA      2.8     0.8    +      -       -      -
    699A  LYS*     1.3    76.9    -      -       -      +
    701A  CYS*     1.3    69.0    +      -       +      +
    702A  ALA      3.0     1.4    +      -       -      -
    703A  ARG*     3.2     2.9    +      -       -      +
    704A  PHE*     2.9    27.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 701 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    556A  ASP*     3.2    30.1    -      -       -      -
    557A  PHE*     3.4    27.6    -      -       +      +
    560A  GLY*     3.4    23.3    -      -       -      -
    561A  SER*     3.6    10.3    -      -       -      +
    564A  ILE*     5.5     1.6    -      -       +      -
    697A  MET*     2.9    18.8    +      -       -      +
    700A  LEU*     1.3    77.2    -      -       +      +
    702A  ALA*     1.3    67.6    +      -       -      +
    704A  PHE*     4.7     5.8    -      -       -      -
    705A  LEU*     2.9    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 702 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385A  PRO*     3.9    18.6    -      -       +      -
    386A  ASN*     5.6     1.8    -      -       -      +
    556A  ASP*     6.5     1.1    -      -       -      -
    557A  PHE*     4.2     7.0    -      -       +      -
    698A  ALA      3.0    19.1    +      -       -      +
    699A  LYS*     4.8     1.3    -      -       -      -
    700A  LEU      3.0     0.2    +      -       -      -
    701A  CYS*     1.3    82.0    -      -       -      +
    703A  ARG*     1.3    68.3    +      -       +      +
    704A  PHE      3.1     0.3    +      -       -      -
    705A  LEU*     3.2     8.1    +      -       -      +
    706A  GLY      3.8     6.1    +      -       -      -
    763B  SER      2.8    16.8    -      -       -      +
    764B  GLY*     3.5    26.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 703 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    386A  ASN*     2.7    45.7    +      -       -      +
    582A  MET*     3.4    31.9    +      -       +      +
    699A  LYS*     3.6    24.8    +      -       -      +
    700A  LEU      3.2     2.4    +      -       -      -
    702A  ALA*     1.3    81.9    -      -       +      +
    704A  PHE*     1.3    59.8    +      -       -      +
    706A  GLY      4.4     0.2    +      -       -      -
    707A  ASN*     3.6    17.2    +      -       -      +
    763B  SER      3.7     7.4    -      -       -      +
   1008B  ILE*     5.2     6.7    -      -       +      +
     70K  HIS*     5.2     9.3    +      -       -      -
     92K  SER*     3.7    18.4    +      -       -      +
     93K  ILE*     2.4    42.2    +      -       -      +
     94K  PRO      3.8     4.6    +      -       -      -
     95K  HIS*     4.1     2.6    -      -       -      +
     96K  PRO*     4.5     6.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 704 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    560A  GLY      4.5     8.1    -      -       -      -
    563A  LEU*     5.0     2.5    -      -       +      -
    564A  ILE*     3.5    36.6    -      -       +      -
    571A  TYR*     4.2    19.3    -      +       -      -
    575A  THR*     6.2     1.6    -      -       +      -
    579A  LEU*     3.5    35.0    -      -       +      -
    582A  MET*     3.5     6.4    -      -       +      +
    700A  LEU*     2.9    22.2    +      -       +      +
    701A  CYS*     4.7     3.6    -      -       -      -
    703A  ARG*     1.3    78.1    -      -       -      +
    705A  LEU*     1.3    78.9    +      -       +      +
    707A  ASN*     3.1     6.6    +      -       +      -
    708A  ARG*     2.9    60.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 705 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    556A  ASP*     3.9    31.6    -      -       +      +
    559A  THR*     4.6     4.7    -      -       +      -
    560A  GLY*     3.7    23.3    -      -       -      +
    563A  LEU*     4.2    19.7    -      -       +      -
    701A  CYS*     2.9    21.3    +      -       -      +
    702A  ALA*     3.2     3.8    +      -       -      +
    704A  PHE*     1.3    88.9    -      -       +      +
    706A  GLY*     1.3    52.6    +      -       -      +
    708A  ARG*     3.3     1.4    +      -       +      +
    709A  GLY*     2.6    38.4    +      -       -      +
    710A  PHE*     4.6    11.2    -      -       +      -
    761B  SER*     3.5    32.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 706 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    702A  ALA      3.8     7.1    +      -       -      -
    703A  ARG      4.9     0.9    -      -       -      -
    704A  PHE      3.3     0.2    -      -       -      -
    705A  LEU*     1.3    80.3    -      -       -      +
    707A  ASN*     1.3    61.9    +      -       -      +
    708A  ARG      3.0     2.9    +      -       -      -
    709A  GLY*     3.3     8.5    +      -       -      -
    760B  MET*     4.6     4.9    -      -       -      +
    761B  SER      3.0    24.0    +      -       -      +
    762B  TYR*     3.9    20.9    -      -       -      +
    763B  SER      4.8     0.7    -      -       -      -
   1006B  SER*     4.2     4.4    +      -       -      -
   1013B  LEU*     3.6    10.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 707 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578A  GLN*     4.8    13.5    -      -       -      +
    582A  MET*     5.0     9.0    -      -       +      +
    703A  ARG      3.6    18.8    +      -       -      +
    704A  PHE*     3.1    10.1    +      -       +      +
    706A  GLY*     1.3    73.2    -      -       -      +
    708A  ARG*     1.3    56.9    +      -       -      +
   1006B  SER*     3.7    16.2    +      -       -      +
   1008B  ILE*     4.3    22.0    -      -       +      +
   1009B  THR*     2.4    37.4    +      -       -      -
   1011B  GLU*     4.4    10.9    -      -       -      +
   1012B  CYS      5.5     0.9    -      -       -      +
   1013B  LEU*     3.8     9.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 708 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    563A  LEU*     3.3    41.8    +      -       -      +
    571A  TYR*     6.4     0.2    -      -       -      -
    704A  PHE*     2.9    49.6    +      -       +      +
    705A  LEU*     3.9     2.7    -      -       +      +
    706A  GLY      3.5     1.3    -      -       -      -
    707A  ASN*     1.3    79.1    -      -       -      +
    709A  GLY*     1.3    70.8    +      -       -      +
    710A  PHE*     5.1     2.2    -      -       -      -
    788A  TRP*     3.4    33.5    -      -       -      -
   1013B  LEU*     3.1     8.4    -      -       -      +
   1014B  GLN*     3.0    78.9    +      -       +      +
   1015B  ALA*     4.2     4.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    563A  LEU*     5.0     0.2    -      -       -      +
    705A  LEU*     2.6    22.6    +      -       -      +
    706A  GLY      3.3     7.1    +      -       -      -
    708A  ARG*     1.3    96.6    +      -       -      +
    710A  PHE*     1.3    64.2    +      -       -      +
    760B  MET*     4.6    10.8    -      -       -      -
    761B  SER      4.8     0.2    -      -       -      -
   1013B  LEU*     4.4     6.7    -      -       -      -
   1015B  ALA*     3.8    14.0    -      -       -      +
   1017B  ILE*     5.3     1.8    -      -       -      -
----------------------------------------------------------
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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