Contacts of the helix formed by residues 691 - 714 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  HIS*     3.1    33.0    -      -       +      +
    433A  ARG*     3.1    21.6    +      -       -      +
    687B  LEU*     2.8    31.7    +      -       +      +
    690B  THR*     1.3    79.9    -      -       +      +
    692B  PRO*     1.3    67.2    -      -       -      +
    693B  GLU*     3.4    10.4    +      -       -      +
    694B  ARG*     3.1    29.1    +      -       +      +
    695B  LEU*     3.1    16.6    +      -       -      +
    806B  GOL      4.8     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 692 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687B  LEU      3.4     6.5    -      -       -      +
    688B  VAL*     4.1    12.6    -      -       -      +
    689B  LYS      4.4     5.6    -      -       -      +
    690B  THR      4.1     3.6    -      -       -      +
    691B  ASP*     1.3    90.8    -      -       -      +
    693B  GLU*     1.3    63.0    +      -       -      +
    695B  LEU*     3.3     9.1    +      -       +      +
    696B  ARG*     3.2    25.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 693 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421A  HIS*     4.8     3.3    -      -       -      +
    632B  ALA*     3.6     9.3    -      -       +      +
    691B  ASP*     3.2     8.9    +      -       -      +
    692B  PRO*     1.3    76.7    -      -       -      +
    694B  ARG*     1.3    65.3    +      -       -      +
    696B  ARG*     3.2    49.6    +      -       -      +
    697B  THR*     3.7     6.9    +      -       -      -
    806B  GOL      2.7    43.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 694 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    424A  PRO*     3.7    23.6    +      -       -      +
    430A  GLU*     4.7     2.2    +      -       -      -
    433A  ARG*     4.4     8.5    -      -       -      +
    633B  ALA      3.9     5.9    +      -       -      -
    635B  THR*     3.7    21.6    +      -       -      +
    637B  GLU*     5.7     0.2    -      -       -      +
    638B  ASP*     2.7    43.4    +      -       -      -
    678B  TYR*     4.1     0.4    +      -       -      -
    682B  MET*     3.2    33.2    -      -       +      +
    687B  LEU*     4.1    15.0    -      -       +      -
    691B  ASP*     3.1    31.8    +      -       +      +
    693B  GLU*     1.3    76.0    -      -       -      +
    695B  LEU*     1.3    64.1    +      -       -      +
    697B  THR*     3.1    31.6    +      -       -      +
    698B  VAL*     3.0    33.4    +      -       +      +
    806B  GOL      3.7    14.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 695 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    622B  ILE*     3.6    16.2    -      -       +      +
    624B  VAL*     6.0     0.2    -      -       +      -
    684B  PRO*     3.4    37.0    -      -       +      +
    687B  LEU*     4.0     9.8    -      -       +      +
    688B  VAL*     3.6    39.0    -      -       +      +
    691B  ASP      3.1    12.3    +      -       -      +
    692B  PRO*     3.5    12.6    -      -       +      +
    693B  GLU      3.3     0.2    -      -       -      -
    694B  ARG*     1.3    74.0    -      -       -      +
    696B  ARG*     1.3    57.3    +      -       -      +
    698B  VAL*     4.3     5.4    -      -       +      -
    699B  LEU*     2.7    55.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 696 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    629B  PRO*     3.3    28.5    -      -       +      +
    630B  SER*     2.6    50.3    +      -       -      +
    631B  PRO*     4.0     4.1    +      -       -      -
    632B  ALA*     3.9    14.5    -      -       -      +
    692B  PRO      3.2    12.4    +      -       -      +
    693B  GLU*     3.2    44.7    +      -       -      +
    694B  ARG      3.2     0.2    -      -       -      -
    695B  LEU*     1.3    77.2    -      -       -      +
    697B  THR*     1.3    63.6    +      -       -      +
    699B  LEU*     5.7     0.2    -      -       -      -
    700B  TYR*     3.0    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 697 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631B  PRO*     3.9     8.9    -      -       +      +
    632B  ALA*     2.9    33.5    +      -       -      +
    633B  ALA      3.8     6.7    +      -       -      +
    634B  TYR*     3.5    36.3    -      -       +      -
    638B  ASP*     3.9     4.3    -      -       -      +
    693B  GLU      3.9     1.0    +      -       -      -
    694B  ARG*     3.1    30.5    +      -       -      +
    696B  ARG*     1.3    76.4    -      -       -      +
    698B  VAL*     1.3    64.4    +      -       -      +
    700B  TYR*     3.3     2.3    +      -       -      +
    701B  ILE*     3.0    27.9    +      -       +      +
    806B  GOL      4.3     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 698 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    678B  TYR*     3.6    27.9    -      -       +      +
    679B  VAL*     5.5     1.6    -      -       +      -
    682B  MET*     3.6    33.2    -      -       +      -
    684B  PRO*     4.7    16.8    -      -       +      -
    687B  LEU*     3.9    19.3    -      -       +      -
    694B  ARG*     3.0    27.7    +      -       +      +
    695B  LEU*     3.1     8.0    +      -       +      +
    697B  THR*     1.3    72.5    -      -       -      +
    699B  LEU*     1.3    65.0    +      -       -      +
    701B  ILE*     3.6     1.7    +      -       -      +
    702B  THR*     2.8    32.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 699 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617B  CYS*     3.5    39.0    -      -       +      +
    622B  ILE*     4.1    13.7    -      -       +      +
    623B  ASN*     3.7    39.7    -      -       +      +
    629B  PRO*     3.6    19.5    -      -       +      -
    684B  PRO*     6.3     0.2    -      -       -      -
    695B  LEU*     2.7    35.7    +      -       +      +
    696B  ARG*     5.7     0.4    -      -       -      -
    698B  VAL*     1.3    70.4    -      -       -      +
    700B  TYR*     1.3    62.5    +      -       -      +
    702B  THR*     3.1     5.8    +      -       -      -
    703B  LEU*     2.7    38.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 700 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    628B  TRP*     4.0    25.4    -      +       +      -
    629B  PRO*     3.2    31.8    -      -       -      +
    631B  PRO*     3.7    28.0    -      -       +      -
    634B  TYR*     3.7    18.4    -      -       -      -
    696B  ARG      3.0    19.1    +      -       -      +
    697B  THR      3.7     3.1    -      -       -      +
    699B  LEU*     1.3    77.1    -      -       -      +
    701B  ILE*     1.3    67.9    +      -       +      +
    703B  LEU*     3.4     2.7    +      -       -      +
    704B  GLU*     2.9    27.5    +      -       +      +
    743B  PHE*     4.1    16.9    -      +       -      -
    744B  GLY*     3.3    31.7    +      -       -      -
    746B  VAL      4.2    10.1    +      -       -      -
    748B  PRO*     4.6    11.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 701 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634B  TYR*     3.7    26.5    -      -       +      -
    638B  ASP*     3.5    28.7    -      -       +      +
    641B  LEU*     3.7    34.5    -      -       +      -
    642B  ILE*     3.9    18.2    -      -       +      -
    645B  ILE*     4.0     9.2    -      -       +      +
    675B  ILE*     5.9     0.2    -      -       -      +
    678B  TYR*     3.5    23.3    -      -       +      +
    697B  THR*     3.0    16.9    +      -       +      +
    698B  VAL      4.1     3.4    -      -       -      +
    700B  TYR*     1.3    80.1    -      -       +      +
    702B  THR*     1.3    65.8    +      -       -      +
    704B  GLU*     3.2     5.1    +      -       -      +
    705B  GLY*     2.8    21.0    +      -       -      -
    743B  PHE*     4.8     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 702 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    613B  LEU*     4.1     9.6    -      -       +      +
    616B  ARG*     6.0     0.9    -      -       +      -
    617B  CYS*     3.9    24.0    -      -       +      +
    675B  ILE*     4.0    19.1    -      -       +      +
    678B  TYR*     4.1     7.5    -      -       -      -
    679B  VAL*     3.6    31.8    -      -       +      +
    698B  VAL*     2.8    20.7    +      -       -      +
    699B  LEU*     3.1     6.1    +      -       -      -
    701B  ILE*     1.3    76.1    -      -       -      +
    703B  LEU*     1.3    63.8    +      -       -      +
    705B  GLY*     3.1     2.4    +      -       -      -
    706B  VAL*     3.0    23.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 703 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617B  CYS*     3.7    34.3    -      -       +      +
    618B  THR*     5.0     0.4    -      -       +      -
    623B  ASN*     4.0     7.2    -      -       -      +
    627B  GLU      3.9     8.7    -      -       -      +
    628B  TRP*     3.6    62.9    -      -       +      +
    629B  PRO*     3.9    10.5    -      -       +      -
    699B  LEU*     2.7    26.3    +      -       +      +
    700B  TYR*     3.7     2.7    -      -       -      +
    702B  THR*     1.3    73.0    -      -       -      +
    704B  GLU*     1.3    63.1    +      -       -      +
    706B  VAL*     3.3     2.9    +      -       -      +
    707B  ARG      3.1    17.7    +      -       -      -
    728B  LEU*     3.9    23.1    -      -       +      +
    752B  LEU*     4.6     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 704 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    628B  TRP*     3.3    18.8    -      -       +      -
    645B  ILE*     4.6     0.2    -      -       -      -
    700B  TYR*     2.9    25.6    +      -       +      +
    701B  ILE      3.8     2.9    -      -       -      +
    703B  LEU*     1.3    77.1    -      -       -      +
    705B  GLY*     1.3    62.3    +      -       -      +
    707B  ARG*     2.9    43.9    +      -       -      +
    708B  VAL*     3.1    24.8    +      -       +      +
    743B  PHE*     3.5    36.5    -      -       +      -
    744B  GLY*     2.6    31.3    +      -       -      +
    745B  ALA      3.3     1.9    +      -       -      -
    746B  VAL*     4.5     3.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 705 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645B  ILE*     3.4    30.2    -      -       -      +
    675B  ILE*     3.8    15.0    -      -       -      -
    701B  ILE      2.8    11.6    +      -       -      -
    702B  THR      3.1     3.6    +      -       -      -
    704B  GLU*     1.3    73.7    -      -       -      +
    706B  VAL*     1.3    54.2    +      -       -      +
    708B  VAL*     3.4     1.0    +      -       -      +
    709B  THR*     2.7    40.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 706 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    610B  LEU*     5.4     2.0    -      -       +      -
    613B  LEU*     3.8    37.7    -      -       +      +
    614B  VAL*     4.1    13.0    -      -       +      +
    617B  CYS*     4.1    14.8    -      -       -      -
    672B  LEU*     5.2     2.2    -      -       +      -
    675B  ILE*     4.3     0.6    -      -       +      +
    702B  THR*     3.0    15.9    +      -       +      +
    703B  LEU      3.7     7.4    -      -       -      +
    705B  GLY*     1.3    73.9    -      -       -      +
    707B  ARG*     1.3    59.5    +      -       -      +
    709B  THR*     2.8    15.7    +      -       -      +
    710B  THR*     2.6    34.1    +      -       -      +
    724B  ILE*     4.0     9.6    -      -       +      -
    728B  LEU*     3.5    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 707 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    628B  TRP*     4.1     7.9    -      -       +      -
    703B  LEU      3.1    12.7    +      -       -      +
    704B  GLU*     2.9    36.7    +      -       -      +
    705B  GLY      3.3     0.2    -      -       -      -
    706B  VAL*     1.3    78.3    -      -       -      +
    708B  VAL*     1.3    70.1    +      -       -      +
    710B  THR*     3.6     1.8    -      -       -      -
    711B  LEU*     2.8    38.4    +      -       -      +
    725B  PHE*     3.9    21.2    -      -       +      -
    728B  LEU*     4.0     8.9    -      -       +      +
    730B  VAL*     4.1    10.3    -      -       +      -
    734B  HIS      3.9    15.0    +      -       -      -
    740B  ASN*     2.7    25.7    +      -       -      +
    742B  GLU      2.9    28.3    +      -       -      -
    745B  ALA*     3.1    15.2    -      -       -      +
    746B  VAL*     3.4    27.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 708 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645B  ILE*     4.1    34.8    -      -       +      +
    648B  LEU*     4.6     5.4    -      -       +      -
    649B  PRO*     4.1    20.9    -      -       +      -
    704B  GLU*     3.1    20.1    +      -       +      +
    705B  GLY      4.2     1.3    -      -       -      +
    706B  VAL      3.3     0.4    -      -       -      -
    707B  ARG*     1.3   106.2    -      -       -      +
    709B  THR*     1.3    58.7    +      -       +      +
    711B  LEU*     3.4     8.7    +      -       +      +
    712B  LEU*     3.1    34.8    +      -       +      +
    740B  ASN      4.9     0.4    -      -       -      +
    741B  PHE*     4.0    12.6    -      -       -      +
    742B  GLU      4.8     1.1    -      -       -      +
    743B  PHE*     5.1     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 709 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    610B  LEU*     5.2     0.7    -      -       -      +
    645B  ILE*     6.0     0.7    -      -       +      -
    648B  LEU*     3.9    22.9    -      -       +      -
    668B  VAL*     3.6    16.7    -      -       +      +
    671B  VAL*     4.1    17.5    -      -       +      -
    672B  LEU*     3.4    30.6    -      -       +      +
    675B  ILE*     4.3     0.4    -      -       +      -
    705B  GLY*     2.7    23.3    +      -       -      +
    706B  VAL*     2.8    18.5    +      -       -      +
    708B  VAL*     1.3    74.8    -      -       +      +
    710B  THR*     1.3    58.3    +      -       -      -
    712B  LEU*     3.4     1.3    +      -       -      -
    713B  LEU*     2.8    34.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 710 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    610B  LEU*     4.6     5.5    -      -       -      +
    706B  VAL*     2.6    28.5    +      -       -      +
    707B  ARG*     3.6     3.8    -      -       -      -
    709B  THR*     1.3    76.6    +      -       -      +
    711B  LEU*     1.3    58.8    +      -       -      +
    713B  LEU*     3.1     8.6    +      -       -      +
    714B  SER*     2.8    28.9    +      -       -      -
    721B  SER*     3.7    30.7    -      -       -      +
    724B  ILE*     3.4    37.9    -      -       +      +
    725B  PHE*     3.8    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 711 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275B  VAL*     3.9    19.6    -      -       +      +
    707B  ARG*     2.8    25.0    +      -       -      +
    708B  VAL*     3.5     9.6    -      -       +      +
    710B  THR*     1.3    76.0    -      -       -      +
    712B  LEU*     1.3    63.8    +      -       +      +
    714B  SER*     2.7    24.9    +      -       -      +
    715B  PRO*     3.6     2.8    -      -       -      +
    725B  PHE*     3.8    15.0    -      -       +      -
    734B  HIS      4.4     1.8    -      -       -      +
    735B  ARG*     2.8    38.4    -      -       -      +
    736B  LYS*     4.4     0.2    -      -       -      -
    737B  GLY      4.8     0.9    -      -       -      +
    740B  ASN*     3.7    22.7    -      -       +      +
    741B  PHE*     3.4    37.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 712 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272B  TYR*     4.5    11.4    -      -       +      -
    275B  VAL*     6.2     0.2    -      -       +      -
    648B  LEU*     3.5    36.6    -      -       +      -
    649B  PRO*     3.7    17.3    -      -       +      +
    652B  ALA*     3.6    24.5    -      -       +      -
    656B  TYR*     2.8    28.7    +      -       +      -
    668B  VAL*     4.2    13.6    -      -       +      +
    708B  VAL*     3.1    19.7    +      -       +      +
    709B  THR      4.0     3.6    -      -       -      +
    711B  LEU*     1.3    75.8    -      -       +      +
    713B  LEU*     1.3    58.2    +      -       -      +
    714B  SER      3.4     0.2    -      -       -      -
    715B  PRO*     3.5     4.7    -      -       -      +
    741B  PHE*     4.0    39.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 713 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    579B  TYR*     5.1     1.1    -      -       +      -
    610B  LEU*     4.2    17.3    -      -       +      -
    665B  ILE*     4.6    12.1    -      -       +      -
    668B  VAL*     3.6    28.9    -      -       +      -
    669B  PHE*     3.6    33.4    -      -       +      -
    672B  LEU*     4.0    10.5    -      -       +      -
    709B  THR      2.8    17.6    +      -       -      +
    710B  THR*     3.1     7.4    +      -       -      +
    712B  LEU*     1.3    74.1    -      -       -      +
    714B  SER*     1.3    59.0    +      -       -      +
    715B  PRO*     3.2     4.3    -      -       -      -
    716B  ILE*     2.9    45.1    +      -       +      +
    717B  LEU*     3.0    24.9    +      -       +      +
    721B  SER*     5.2     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 714 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275B  VAL*     3.5    18.4    -      -       -      +
    710B  THR      2.8    11.2    +      -       -      -
    711B  LEU*     2.7    24.6    +      -       -      +
    713B  LEU*     1.3    78.9    -      -       -      +
    715B  PRO*     1.3    64.9    -      -       -      +
    717B  LEU      4.0     0.9    -      -       -      -
    718B  PRO*     3.1    30.3    -      -       -      +
    721B  SER*     3.4    26.0    -      -       -      -
    725B  PHE*     4.8     6.3    -      -       -      -
    735B  ARG      5.1     0.7    +      -       -      -
    805B  GOL      3.6    11.2    +      -       -      -
----------------------------------------------------------
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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