Contacts of the helix formed by residues 691 - 714 (chain A) in PDB entry 4EGA


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 691 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687A  LEU*     2.9    30.8    +      -       +      +
    689A  LYS      3.2     0.2    +      -       -      -
    690A  THR*     1.3    82.0    -      -       +      +
    692A  PRO*     1.3    66.9    -      -       -      +
    693A  GLU*     3.4    10.9    +      -       -      +
    694A  ARG*     3.2    33.4    +      -       +      +
    695A  LEU*     3.2    15.8    +      -       -      +
    421B  HIS*     3.2    33.4    +      -       +      +
    424B  PRO*     5.6     0.2    -      -       -      +
    433B  ARG*     4.0    11.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 692 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687A  LEU      4.0     4.3    -      -       -      +
    688A  VAL      4.1    16.2    -      -       -      +
    689A  LYS      4.0     8.1    -      -       -      +
    690A  THR      4.1     2.0    -      -       -      +
    691A  ASP*     1.3    87.4    -      -       -      +
    693A  GLU*     1.3    61.8    +      -       -      +
    695A  LEU*     3.3    15.8    +      -       +      +
    696A  ARG*     3.3    19.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 693 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632A  ALA*     3.9    23.0    -      -       +      +
    691A  ASP*     3.2     8.2    +      -       -      +
    692A  PRO*     1.3    80.9    -      -       +      +
    694A  ARG*     1.3    62.0    +      -       -      +
    696A  ARG*     3.1    49.2    +      -       -      +
    697A  THR      3.9     2.9    +      -       -      -
    421B  HIS      5.3     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 694 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632A  ALA*     5.7     0.7    -      -       -      -
    633A  ALA      4.0     7.1    +      -       -      -
    635A  THR*     3.5    18.9    +      -       -      +
    638A  ASP*     2.9    41.5    +      -       -      -
    682A  MET*     3.8    22.4    -      -       -      +
    687A  LEU*     3.7    22.9    -      -       +      -
    691A  ASP*     3.2    34.4    +      -       +      +
    693A  GLU*     1.3    74.6    -      -       -      +
    695A  LEU*     1.3    65.2    +      -       -      +
    696A  ARG      3.2     1.2    +      -       -      -
    697A  THR*     3.2    38.2    +      -       -      +
    698A  VAL*     3.2    19.9    +      -       +      +
    424B  PRO*     3.8    27.5    +      -       -      +
    430B  GLU*     5.0     4.1    +      -       -      +
    433B  ARG*     4.7     9.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 695 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    622A  ILE*     3.6    22.9    -      -       +      +
    624A  VAL*     6.2     1.8    -      -       +      -
    684A  PRO*     3.5    35.2    -      -       +      +
    687A  LEU*     4.0    12.5    -      -       +      +
    688A  VAL*     3.4    43.5    -      -       +      +
    691A  ASP      3.2     9.5    +      -       -      +
    692A  PRO*     3.3    11.6    +      -       +      +
    694A  ARG*     1.3    77.7    -      -       -      +
    696A  ARG*     1.3    57.0    +      -       -      +
    698A  VAL*     4.6     1.1    -      -       +      -
    699A  LEU*     2.8    47.5    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    629A  PRO*     3.5    26.0    -      -       +      +
    630A  SER*     2.6    51.4    +      -       -      +
    631A  PRO*     4.1     4.0    +      -       +      +
    632A  ALA*     4.0    12.7    -      -       -      +
    692A  PRO      3.4    13.6    +      -       -      +
    693A  GLU*     3.1    49.3    +      -       -      +
    694A  ARG      3.1     0.8    -      -       -      -
    695A  LEU*     1.3    78.0    -      -       +      +
    697A  THR*     1.3    57.6    +      -       -      +
    699A  LEU*     5.6     0.2    -      -       -      -
    700A  TYR*     2.9    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 697 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631A  PRO*     4.0     9.1    -      -       -      +
    632A  ALA*     2.8    36.0    +      -       -      +
    633A  ALA      3.7     6.6    +      -       -      +
    634A  TYR*     3.6    33.4    -      -       +      -
    638A  ASP*     3.8     5.2    -      -       -      +
    693A  GLU      3.9     2.1    +      -       -      -
    694A  ARG*     3.2    28.6    +      -       -      +
    696A  ARG*     1.3    77.8    -      -       -      +
    698A  VAL*     1.3    62.7    +      -       -      +
    700A  TYR*     3.8     1.9    -      -       -      +
    701A  ILE*     3.2    28.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 698 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    678A  TYR*     3.5    33.5    -      -       +      +
    679A  VAL*     5.2     2.5    -      -       +      -
    682A  MET*     3.9    29.4    -      -       +      -
    684A  PRO*     4.6    18.2    -      -       +      -
    687A  LEU*     4.2    11.7    -      -       +      -
    694A  ARG*     3.2    33.9    +      -       -      +
    695A  LEU*     4.0     3.1    -      -       +      +
    697A  THR*     1.3    73.9    -      -       -      +
    699A  LEU*     1.3    66.2    +      -       -      +
    701A  ILE*     3.5     2.1    +      -       -      +
    702A  THR*     2.9    34.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 699 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617A  CYS*     3.6    36.6    -      -       +      +
    622A  ILE*     4.2    19.7    -      -       +      +
    623A  ASN*     3.6    38.1    -      -       +      +
    629A  PRO*     3.8    23.6    -      -       +      -
    684A  PRO*     6.2     0.4    -      -       +      -
    695A  LEU*     2.8    33.6    +      -       +      +
    696A  ARG*     5.6     0.2    -      -       -      -
    698A  VAL*     1.3    75.9    -      -       -      +
    700A  TYR*     1.3    62.7    +      -       -      +
    702A  THR*     3.3     5.6    +      -       -      -
    703A  LEU*     2.9    26.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 700 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    628A  TRP*     3.8    30.7    -      +       +      -
    629A  PRO*     3.4    30.9    -      -       -      +
    631A  PRO*     3.7    26.7    -      -       +      -
    634A  TYR*     3.9    17.3    -      -       -      -
    696A  ARG      2.9    18.1    +      -       -      +
    697A  THR      3.8     2.9    -      -       -      +
    699A  LEU*     1.3    79.0    -      -       -      +
    701A  ILE*     1.3    63.3    +      -       +      +
    703A  LEU*     3.4     3.4    +      -       -      +
    704A  GLU*     2.9    34.4    +      -       +      +
    743A  PHE*     4.1    15.9    -      +       -      -
    744A  GLY*     3.3    32.1    +      -       -      -
    746A  VAL      4.1     6.9    +      -       -      -
    748A  PRO*     4.4    14.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 701 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634A  TYR*     3.7    14.1    -      -       +      -
    638A  ASP*     3.7    16.8    -      -       +      -
    641A  LEU*     3.7    34.3    -      -       +      +
    642A  ILE*     3.4    36.8    -      -       +      -
    645A  ILE*     4.1     9.7    -      -       +      +
    675A  ILE*     5.5     0.2    -      -       -      +
    678A  TYR*     3.6    22.0    -      -       +      +
    697A  THR      3.2    15.0    +      -       -      +
    698A  VAL      4.0     3.4    -      -       -      +
    700A  TYR*     1.3    78.9    -      -       +      +
    702A  THR*     1.3    54.3    +      -       -      +
    704A  GLU*     3.3     3.8    +      -       -      +
    705A  GLY*     2.8    32.6    +      -       -      -
    743A  PHE*     4.5     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 702 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    613A  LEU*     4.6     6.5    -      -       +      +
    616A  ARG*     5.9     1.6    -      -       +      -
    617A  CYS*     3.4    28.3    -      -       +      +
    675A  ILE*     4.4    14.3    -      -       +      +
    678A  TYR*     4.4     3.7    -      -       -      -
    679A  VAL*     3.4    31.2    -      -       +      +
    698A  VAL*     2.9    25.0    +      -       -      +
    699A  LEU*     3.5     6.9    -      -       +      -
    701A  ILE*     1.3    77.7    -      -       -      +
    703A  LEU*     1.3    56.7    +      -       -      +
    705A  GLY*     3.3     1.0    +      -       -      -
    706A  VAL*     2.8    42.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 703 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617A  CYS*     3.4    39.0    -      -       +      +
    618A  THR*     4.6     0.2    -      -       +      -
    623A  ASN*     4.0    19.7    -      -       -      +
    627A  GLU      4.1     3.4    -      -       -      +
    628A  TRP*     3.8    30.4    -      -       +      -
    629A  PRO*     4.1    19.5    -      -       +      -
    699A  LEU*     2.9    21.0    +      -       +      +
    700A  TYR*     3.7     4.3    -      -       -      +
    702A  THR*     1.3    78.7    -      -       -      +
    704A  GLU*     1.3    57.5    +      -       -      +
    706A  VAL*     3.3     2.6    +      -       -      +
    707A  ARG*     2.8    28.2    +      -       -      +
    728A  LEU*     4.0    24.2    -      -       +      +
    752A  LEU*     4.3    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 704 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    628A  TRP*     3.3    19.7    -      -       +      -
    700A  TYR*     2.9    22.3    +      -       +      +
    701A  ILE      3.9     2.7    -      -       -      +
    703A  LEU*     1.3    73.4    -      -       -      +
    705A  GLY*     1.3    65.0    +      -       -      +
    707A  ARG*     2.7    43.4    +      -       -      +
    708A  VAL*     3.1    26.6    +      -       +      +
    743A  PHE*     3.4    37.2    -      -       +      -
    744A  GLY*     2.7    30.8    +      -       -      +
    745A  ALA      4.5     0.4    -      -       -      -
    746A  VAL      4.6     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 705 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645A  ILE*     3.7    26.1    -      -       -      +
    675A  ILE*     3.8    14.4    -      -       -      -
    701A  ILE      2.8    21.7    +      -       -      -
    702A  THR      3.7     0.9    -      -       -      -
    704A  GLU*     1.3    73.6    -      -       -      +
    706A  VAL*     1.3    62.2    +      -       -      +
    708A  VAL*     3.3     1.9    +      -       -      +
    709A  THR*     2.9    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 706 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    610A  LEU*     5.0     3.6    -      -       +      -
    613A  LEU*     3.7    39.9    -      -       +      -
    614A  VAL*     3.7    27.1    -      -       +      -
    617A  CYS*     4.4     8.3    -      -       -      -
    672A  LEU*     5.0     1.1    -      -       +      -
    675A  ILE*     4.2     1.3    -      -       -      +
    702A  THR*     2.8    29.3    +      -       +      +
    703A  LEU*     3.7     5.2    -      -       -      +
    705A  GLY*     1.3    71.5    -      -       -      +
    707A  ARG*     1.3    62.2    +      -       -      +
    709A  THR*     3.0     7.1    +      -       -      +
    710A  THR*     2.9    37.9    +      -       -      +
    724A  ILE*     4.3     1.3    -      -       +      -
    728A  LEU*     4.2    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 707 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    628A  TRP*     4.0     4.7    -      -       +      -
    703A  LEU      2.8    18.3    +      -       -      +
    704A  GLU*     2.7    42.2    +      -       -      +
    705A  GLY      3.2     0.4    -      -       -      -
    706A  VAL*     1.3    76.4    -      -       -      +
    708A  VAL*     1.3    68.4    -      -       -      +
    710A  THR      3.2     1.7    +      -       -      -
    711A  LEU*     2.9    33.2    +      -       -      +
    725A  PHE*     3.4    22.8    -      -       +      -
    728A  LEU*     3.8    13.9    -      -       +      +
    730A  VAL*     3.9    14.4    -      -       +      -
    734A  HIS      3.9    16.6    +      -       -      -
    740A  ASN*     2.9    31.5    +      -       -      +
    742A  GLU      3.2    13.1    +      -       -      -
    745A  ALA*     3.8    12.3    -      -       -      +
    746A  VAL*     3.6    27.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 708 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645A  ILE*     4.2    23.3    -      -       +      +
    648A  LEU*     5.2     3.6    -      -       +      -
    649A  PRO*     4.1    25.1    -      -       +      -
    704A  GLU*     3.1    24.7    +      -       -      +
    705A  GLY      4.0     2.0    -      -       -      +
    707A  ARG*     1.3   103.0    -      -       -      +
    709A  THR*     1.3    67.3    +      -       +      +
    711A  LEU*     3.2     9.9    +      -       +      +
    712A  LEU*     3.1    29.2    +      -       +      +
    740A  ASN      4.8     1.3    -      -       -      +
    741A  PHE*     4.3    14.1    -      -       -      +
    742A  GLU      4.9     0.4    -      -       -      +
    743A  PHE*     5.1     2.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 709 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    610A  LEU*     5.1     1.0    -      -       -      +
    645A  ILE*     6.0     1.1    -      -       +      -
    648A  LEU*     3.7    25.6    -      -       +      -
    668A  VAL*     3.6    19.8    -      -       +      +
    671A  VAL*     3.9    19.5    -      -       +      -
    672A  LEU*     3.2    31.9    -      -       +      +
    675A  ILE*     4.3     1.3    -      -       +      -
    705A  GLY*     2.9    21.6    +      -       -      +
    706A  VAL*     3.0    10.2    +      -       -      +
    708A  VAL*     1.3    76.0    -      -       +      +
    710A  THR*     1.3    57.1    +      -       -      +
    712A  LEU*     3.4     2.1    +      -       -      +
    713A  LEU*     2.9    34.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 710 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    610A  LEU*     4.3     6.4    -      -       -      +
    706A  VAL*     2.9    25.6    +      -       -      +
    707A  ARG      3.5     4.0    -      -       -      -
    709A  THR*     1.3    73.7    +      -       -      +
    711A  LEU*     1.3    65.9    +      -       -      +
    713A  LEU*     3.2    10.4    +      -       +      -
    714A  SER*     2.9    22.2    +      -       -      -
    721A  SER*     3.7    30.1    -      -       -      -
    724A  ILE*     3.4    39.9    -      -       +      +
    725A  PHE*     3.9    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 711 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275A  VAL*     4.8     9.5    -      -       +      +
    707A  ARG*     2.9    23.3    +      -       -      +
    708A  VAL*     3.2    11.9    +      -       +      +
    710A  THR*     1.3    70.7    -      -       -      +
    712A  LEU*     1.3    62.3    +      -       +      +
    714A  SER*     2.7    28.8    +      -       -      +
    715A  PRO*     3.8     2.4    -      -       -      +
    725A  PHE*     3.5    16.0    -      -       +      -
    734A  HIS      4.6     0.4    -      -       -      +
    735A  ARG*     3.1    36.6    -      -       -      +
    736A  LYS*     4.1     4.7    -      -       -      +
    737A  GLY      4.5     1.6    -      -       -      +
    740A  ASN*     3.3    34.5    -      -       +      +
    741A  PHE*     3.4    32.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 712 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272A  TYR*     4.0    27.6    -      -       +      +
    648A  LEU*     4.0    15.7    -      -       +      -
    649A  PRO*     3.5    41.5    -      -       +      +
    652A  ALA*     3.7    19.1    -      -       +      -
    656A  TYR*     2.6    32.3    +      -       +      -
    668A  VAL*     4.0    17.1    -      -       +      +
    708A  VAL*     3.1    22.4    +      -       +      +
    709A  THR*     3.9     3.8    -      -       -      +
    711A  LEU*     1.3    78.2    -      -       +      +
    713A  LEU*     1.3    55.3    +      -       -      +
    714A  SER      3.3     0.4    -      -       -      -
    715A  PRO*     3.3     5.3    -      -       -      +
    716A  ILE*     4.5     0.3    -      -       -      +
    741A  PHE*     4.4    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 713 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    579A  TYR*     5.1     0.4    -      -       +      -
    610A  LEU*     4.1    22.7    -      -       +      -
    665A  ILE*     4.5    10.1    -      -       +      -
    668A  VAL*     3.6    21.5    -      -       +      -
    669A  PHE*     3.8    35.0    -      -       +      -
    672A  LEU*     4.2     6.7    -      -       +      -
    709A  THR      2.9    22.1    +      -       -      +
    710A  THR*     3.2     9.2    +      -       +      +
    712A  LEU*     1.3    74.2    -      -       -      +
    714A  SER*     1.3    58.5    +      -       -      +
    715A  PRO*     3.3     2.7    -      -       -      -
    716A  ILE*     3.0    28.3    +      -       +      +
    717A  LEU*     2.8    41.1    +      -       +      -
    721A  SER*     5.1     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 714 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275A  VAL*     3.6    18.7    -      -       -      +
    710A  THR      2.9    10.2    +      -       -      -
    711A  LEU*     2.7    25.1    +      -       -      +
    713A  LEU*     1.3    78.8    -      -       -      +
    715A  PRO*     1.3    67.6    -      -       -      +
    716A  ILE      3.3     0.5    +      -       -      -
    717A  LEU      4.3     0.2    -      -       -      -
    718A  PRO*     3.3    23.6    -      -       -      +
    721A  SER*     3.5    25.8    -      -       -      -
    725A  PHE*     5.0     5.6    -      -       -      -
    735A  ARG      5.2     1.2    +      -       -      -
    803A  GOL      3.5    14.0    +      -       -      -
----------------------------------------------------------
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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