Contacts of the helix formed by residues 732 - 764 (chain A) in PDB entry 6FF7


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 PRO 732 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    731A  LEU*     1.3    75.7    -      -       -      +
    733A  THR*     1.3    65.2    +      -       -      +
    734A  PRO*     3.6     3.8    -      -       +      -
    735A  ILE*     4.0     8.7    +      -       +      +
    736A  GLU*     3.6    20.3    +      -       -      +
    244C  GLU      4.3    18.2    -      -       -      +
    245C  TRP*     5.4     3.8    -      -       -      -
    246C  LYS      5.0     8.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 733 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    731A  LEU      3.7     2.0    +      -       -      -
    732A  PRO*     1.3    72.4    -      -       -      +
    734A  PRO*     1.4    60.0    -      -       -      +
    736A  GLU*     3.5     3.8    +      -       -      +
    737A  ASN*     3.0    31.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 734 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    696A  MET*     6.5     1.1    -      -       +      -
    732A  PRO*     3.6     3.4    -      -       +      -
    733A  THR*     1.4    74.7    -      -       -      +
    735A  ILE*     1.3    59.1    +      -       -      +
    737A  ASN*     3.9     2.0    -      -       +      -
    738A  MET*     3.0    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 735 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    693A  ILE*     6.3     2.2    -      -       +      -
    709A  ILE*     5.9     7.9    -      -       +      -
    732A  PRO*     4.0    10.9    +      -       +      +
    733A  THR      3.4     0.2    -      -       -      -
    734A  PRO*     1.3    79.9    -      -       -      +
    736A  GLU*     1.3    58.6    +      -       -      +
    738A  MET*     3.5     4.9    +      -       -      +
    739A  ILE*     3.0    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 736 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    731A  LEU*     5.2     9.6    -      -       +      -
    732A  PRO      3.6    15.8    +      -       -      +
    733A  THR*     3.5     5.6    +      -       -      +
    734A  PRO      3.3     0.6    -      -       -      -
    735A  ILE*     1.3    80.2    -      -       -      +
    737A  ASN*     1.3    57.6    +      -       -      +
    739A  ILE*     3.3     7.8    +      -       -      +
    740A  LEU*     2.9    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 737 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    733A  THR*     3.0    18.7    +      -       -      +
    734A  PRO*     4.6     2.0    -      -       +      +
    736A  GLU*     1.3    73.3    -      -       -      +
    738A  MET*     1.3    62.8    +      -       -      +
    740A  LEU*     3.6     9.1    -      -       +      +
    741A  ARG*     3.0    27.7    +      -       -      +
    461D  SER*     4.4    29.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 738 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    734A  PRO      3.0    19.5    +      -       -      +
    735A  ILE*     4.1     4.9    -      -       -      +
    736A  GLU      3.3     0.2    -      -       -      -
    737A  ASN*     1.3    73.3    -      -       -      +
    739A  ILE*     1.3    59.9    +      -       -      +
    741A  ARG*     4.0     4.7    -      -       -      +
    742A  TYR*     2.9    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 739 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    709A  ILE      6.0     0.2    -      -       -      +
    712A  HIS*     5.4     3.1    -      -       +      +
    713A  LEU*     4.7    26.4    -      -       +      +
    716A  ALA*     5.2     9.2    -      -       +      +
    735A  ILE      3.0    18.9    +      -       -      +
    736A  GLU*     3.5     8.1    -      -       -      +
    737A  ASN      3.3     0.2    -      -       -      -
    738A  MET*     1.3    76.8    -      -       -      +
    740A  LEU*     1.3    55.8    +      -       -      +
    742A  TYR*     3.8     6.0    -      -       -      +
    743A  VAL*     2.9    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 740 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    716A  ALA*     6.4     0.2    -      -       -      -
    736A  GLU      2.9    14.9    +      -       -      +
    737A  ASN*     3.6    13.0    -      -       +      +
    738A  MET      3.3     0.4    -      -       -      -
    739A  ILE*     1.3    77.2    -      -       -      +
    741A  ARG*     1.3    57.2    +      -       -      +
    743A  VAL*     3.5     3.8    +      -       -      +
    744A  LYS*     2.9    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 741 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    737A  ASN      3.0    16.6    +      -       -      +
    738A  MET*     4.2     4.5    -      -       -      +
    740A  LEU*     1.3    75.7    -      -       -      +
    742A  TYR*     1.3    56.7    +      -       -      +
    744A  LYS*     3.6     7.4    -      -       -      +
    745A  ALA*     2.9    28.8    +      -       -      +
    461D  SER      4.8     1.8    -      -       -      +
    462D  GLU*     4.7    26.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 742 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    685A  LEU*     6.5     0.9    -      -       +      -
    689A  VAL*     5.9     7.0    -      -       +      -
    713A  LEU*     6.4     1.6    -      -       +      -
    738A  MET      2.9    19.4    +      -       -      +
    739A  ILE*     3.8     6.5    -      -       -      +
    740A  LEU      3.3     0.2    -      -       -      -
    741A  ARG*     1.3    74.6    -      -       -      +
    743A  VAL*     1.3    60.2    +      -       -      +
    745A  ALA*     3.3     7.7    +      -       -      +
    746A  LYS*     2.9    27.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 743 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    713A  LEU      5.3     1.8    -      -       -      +
    716A  ALA*     5.0     7.9    -      -       +      +
    717A  TRP*     4.6    27.8    -      -       +      +
    720A  TRP*     5.5     6.7    -      -       +      -
    739A  ILE      2.9    17.2    +      -       -      +
    740A  LEU*     4.2     4.0    -      -       -      +
    742A  TYR*     1.3    75.9    -      -       -      +
    744A  LYS*     1.3    57.9    +      -       -      +
    746A  LYS*     3.7     7.6    -      -       -      +
    747A  ALA*     2.8    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 744 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    740A  LEU      2.9    18.8    +      -       -      +
    741A  ARG*     3.6     9.9    -      -       -      +
    742A  TYR      3.2     0.4    -      -       -      -
    743A  VAL*     1.3    76.5    -      -       -      +
    745A  ALA*     1.3    59.1    +      -       -      +
    747A  ALA*     3.3     7.4    +      -       -      +
    748A  ASP*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 745 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    741A  ARG      2.9    16.5    +      -       -      +
    742A  TYR*     3.3     7.8    +      -       -      +
    744A  LYS*     1.3    73.2    -      -       -      +
    746A  LYS*     1.3    61.5    +      -       -      +
    748A  ASP*     3.3     7.4    +      -       -      +
    749A  TRP*     3.0    27.9    +      -       -      +
    206D  TRP*     5.4    13.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 746 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    717A  TRP*     6.3     2.5    -      -       +      -
    742A  TYR      2.9    17.1    +      -       -      +
    743A  VAL*     3.8     8.5    -      -       +      +
    745A  ALA*     1.3    76.3    -      -       -      +
    747A  ALA*     1.3    56.7    +      -       -      +
    749A  TRP*     3.5     6.1    +      -       -      +
    750A  TRP*     2.9    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 747 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    720A  TRP*     6.6     0.2    -      -       +      -
    743A  VAL      2.8    18.9    +      -       -      +
    744A  LYS*     3.5     9.6    -      -       -      +
    745A  ALA      3.2     0.2    -      -       -      -
    746A  LYS*     1.3    73.8    -      -       -      +
    748A  ASP*     1.3    60.2    +      -       -      +
    750A  TRP*     3.6     6.4    -      -       -      +
    751A  THR*     2.9    31.7    +      -       -      -
    214R  THR*     5.0     4.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 748 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    744A  LYS      2.9    16.2    +      -       -      +
    745A  ALA*     3.3     8.7    +      -       -      +
    747A  ALA*     1.3    76.6    -      -       -      +
    749A  TRP*     1.3    56.9    +      -       -      +
    751A  THR*     4.1     0.5    -      -       -      -
    752A  ASN*     2.9    33.3    +      -       -      +
    204D  LEU      5.5     3.6    -      -       -      -
    205D  GLY*     5.0    17.9    -      -       -      +
    212R  ASN      5.7     4.0    -      -       -      +
    214R  THR*     4.9    13.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 749 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    745A  ALA      3.0    16.0    +      -       -      +
    746A  LYS*     3.8     7.4    -      -       -      +
    748A  ASP*     1.3    76.0    -      -       -      +
    750A  TRP*     1.3    57.0    +      -       -      +
    752A  ASN*     3.8     4.3    -      -       -      +
    753A  THR*     2.9    32.1    +      -       -      -
    224D  ALA*     5.3    11.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 750 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    746A  LYS      2.9    19.0    +      -       -      +
    747A  ALA*     3.6     9.0    -      -       -      +
    749A  TRP*     1.3    77.4    -      -       -      +
    751A  THR*     1.3    56.6    +      -       -      +
    753A  THR*     3.8     4.5    -      -       -      -
    754A  ALA*     2.9    28.3    +      -       -      +
    778A  ARG*     5.9     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 751 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    747A  ALA      2.9    16.3    +      -       -      -
    748A  ASP      4.3     0.4    -      -       -      -
    750A  TRP*     1.3    74.5    -      -       -      +
    752A  ASN*     1.3    61.6    +      -       -      +
    754A  ALA*     3.6     7.4    -      -       -      +
    755A  HIS*     2.9    30.0    +      -       -      +
    214R  THR*     4.3    24.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 752 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    748A  ASP      2.9    20.5    +      -       -      +
    749A  TRP*     4.1     4.3    -      -       -      +
    751A  THR*     1.3    76.0    -      -       -      +
    753A  THR*     1.3    60.0    +      -       -      +
    755A  HIS*     4.4     5.4    -      -       -      +
    756A  TYR*     3.4    20.8    +      -       -      +
    204D  LEU*     4.7    21.3    -      -       +      +
    225D  ASP*     6.4     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 753 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    749A  TRP      2.9    19.0    +      -       -      -
    750A  TRP*     3.9     4.5    -      -       -      -
    752A  ASN*     1.3    76.1    -      -       -      +
    754A  ALA*     1.3    60.2    +      -       -      +
    756A  TYR*     3.7     4.5    -      -       -      +
    757A  ASN*     2.9    32.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 754 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    750A  TRP      2.9    18.2    +      -       -      +
    751A  THR*     3.2    10.3    +      -       -      +
    753A  THR*     1.3    73.7    -      -       -      +
    755A  HIS*     1.3    60.8    +      -       -      +
    757A  ASN*     4.7     1.3    -      -       -      +
    758A  ARG*     2.9    32.2    +      -       -      +
    775A  ASN*     5.7     4.6    -      -       +      +
    778A  ARG*     3.8    31.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 755 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    751A  THR      2.9    16.5    +      -       -      +
    752A  ASN*     4.4     6.3    -      -       -      +
    754A  ALA*     1.3    75.3    -      -       -      +
    756A  TYR*     1.3    57.0    +      -       -      +
    758A  ARG*     3.7     4.6    -      -       -      +
    759A  GLU*     3.0    30.0    +      -       -      +
    223R  PHE*     6.1     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 756 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    752A  ASN      3.4    17.8    +      -       -      +
    753A  THR*     3.3     6.7    +      -       -      +
    754A  ALA      3.3     0.4    -      -       -      -
    755A  HIS*     1.3    80.0    -      -       -      +
    757A  ASN*     1.3    58.5    +      -       -      +
    759A  GLU*     3.3     6.9    +      -       -      +
    760A  ARG*     2.9    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 757 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    753A  THR      2.9    15.3    +      -       -      +
    754A  ALA*     4.7     1.8    -      -       -      +
    756A  TYR*     1.3    75.0    -      -       -      +
    758A  ARG*     1.3    60.3    +      -       -      +
    760A  ARG*     3.7     9.4    -      -       +      +
    761A  ILE*     2.9    30.0    +      -       -      +
    771A  VAL*     5.5    12.6    -      -       +      +
    775A  ASN*     5.7     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 758 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    754A  ALA      2.9    21.4    +      -       -      +
    755A  HIS*     3.7     5.6    -      -       -      +
    757A  ASN*     1.3    76.6    -      -       -      +
    759A  GLU*     1.3    57.9    +      -       -      +
    761A  ILE*     3.5     3.9    +      -       -      +
    762A  ARG*     2.9    30.6    +      -       -      +
    775A  ASN*     5.5     9.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 759 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    755A  HIS      3.0    17.8    +      -       -      +
    756A  TYR*     3.6     7.0    -      -       -      +
    758A  ARG*     1.3    75.9    -      -       -      +
    760A  ARG*     1.3    58.0    +      -       -      +
    762A  ARG*     3.5     6.7    -      -       -      +
    763A  ARG*     3.0    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 760 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    756A  TYR      2.9    16.3    +      -       -      +
    757A  ASN*     3.7    10.3    -      -       +      +
    758A  ARG      3.3     0.4    -      -       -      -
    759A  GLU*     1.3    77.2    -      -       -      +
    761A  ILE*     1.3    54.8    +      -       -      +
    763A  ARG*     4.0     1.7    -      -       -      +
    764A  GLY      3.0     6.9    +      -       -      -
    765A  ALA*     2.6    50.0    +      -       +      +
    766A  THR*     4.7     6.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 761 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    757A  ASN      2.9    16.9    +      -       -      +
    758A  ARG*     3.7     3.8    -      -       -      +
    760A  ARG*     1.3    75.1    -      -       -      +
    762A  ARG*     1.3    62.5    +      -       -      +
    764A  GLY*     4.0     5.4    +      -       -      +
    766A  THR*     4.5    15.9    -      -       -      +
    771A  VAL*     6.5     0.4    -      -       +      -
    772A  CYS*     5.7    11.7    -      -       +      -
    775A  ASN*     6.5     0.4    -      -       +      -
    902A  TYR*     4.4    14.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 762 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    758A  ARG      2.9    19.3    +      -       -      +
    759A  GLU*     3.5     9.4    -      -       -      +
    760A  ARG      3.2     0.2    -      -       -      -
    761A  ILE*     1.3    80.0    -      -       -      +
    763A  ARG*     1.3    63.9    +      -       -      +
    764A  GLY      3.4     0.5    +      -       -      -
    902A  TYR*     5.1    13.7    -      -       -      +
    903A  SER*     4.7    19.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 763 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    759A  GLU      3.0    15.8    +      -       -      +
    760A  ARG*     4.6     2.2    -      -       -      +
    762A  ARG*     1.3    77.2    -      -       -      +
    764A  GLY*     1.3    59.6    +      -       -      +
    765A  ALA*     5.1     1.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 764 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     375    G      5.3     4.3    +      -       -      -
     395    C      4.2     7.6    +      -       -      -
    760A  ARG      3.0     5.2    +      -       -      -
    761A  ILE*     4.0     6.3    -      -       -      -
    762A  ARG      3.2     4.7    -      -       -      -
    763A  ARG*     1.3    80.2    -      -       -      +
    765A  ALA*     1.3    66.0    +      -       -      +
    766A  THR      3.8     4.5    -      -       -      -
----------------------------------------------------------
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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