Contacts of the helix formed by residues 725 - 751 (chain A) in PDB entry 4FUL


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with GLY 725 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    316A  ASP*     3.3    23.6    -      -       -      -
    317A  GLU      3.6     4.5    -      -       -      -
    318A  VAL*     4.2     5.6    -      -       -      +
    721A  LEU      5.1     0.6    +      -       -      -
    723A  GLY*     3.2     3.8    -      -       -      +
    724A  CYS*     1.3    82.3    -      -       -      +
    726A  THR*     1.4    59.9    +      -       -      -
    727A  ALA      3.5     2.7    -      -       -      -
    728A  MET      3.7     1.2    +      -       -      -
    729A  LEU*     3.1    35.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 726 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  LEU      3.6    11.7    +      -       -      +
    317A  GLU*     2.8    29.9    +      -       -      +
    319A  ARG*     5.1     5.0    +      -       -      +
    725A  GLY*     1.4    68.8    -      -       -      -
    727A  ALA*     1.3    66.8    +      -       -      +
    729A  LEU*     3.4    12.7    +      -       +      +
    730A  HIS*     3.1    23.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 727 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  LEU*     2.9    33.0    +      -       +      +
    316A  ASP*     3.9    16.4    -      -       -      +
    689A  LYS*     4.6     5.8    -      -       -      +
    725A  GLY      3.5     0.8    -      -       -      -
    726A  THR*     1.3    73.7    -      -       -      +
    728A  MET*     1.4    53.8    +      -       -      +
    730A  HIS*     3.2    14.9    +      -       +      -
    731A  ASP*     2.8    41.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 728 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  TYR*     3.6    12.1    -      -       -      -
    316A  ASP*     5.2     0.6    +      -       -      +
    689A  LYS*     3.5    66.4    -      -       +      +
    693A  HIS*     4.3     5.4    -      -       +      +
    720A  TYR*     3.5    24.7    -      -       -      +
    724A  CYS*     4.0    16.2    -      -       -      +
    725A  GLY      3.7     7.1    +      -       -      +
    726A  THR      3.4     0.4    -      -       -      -
    727A  ALA*     1.4    71.2    -      -       -      +
    729A  LEU*     1.3    60.2    +      -       -      +
    731A  ASP*     3.4    15.5    -      -       +      +
    732A  PHE*     2.9    55.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 729 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  PHE*     3.8    31.2    -      -       +      -
    153A  GLN*     4.6    11.4    -      -       +      +
    154A  LEU*     4.9     3.4    -      -       +      -
    157A  LEU*     3.7    24.9    -      -       +      +
    721A  LEU*     3.4    34.5    -      -       +      +
    724A  CYS*     3.7    11.4    -      -       -      -
    725A  GLY      3.1    29.4    +      -       -      +
    726A  THR*     3.6    12.6    -      -       +      +
    727A  ALA      3.3     0.4    -      -       -      -
    728A  MET*     1.3    76.1    -      -       -      +
    730A  HIS*     1.4    49.8    +      -       -      +
    732A  PHE*     3.7     3.9    +      -       -      +
    733A  THR*     2.7    37.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 730 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  GLN*     5.5     1.3    -      -       -      +
    726A  THR*     3.1    14.3    +      -       +      +
    727A  ALA*     3.3    12.8    -      -       +      +
    729A  LEU*     1.4    72.2    -      -       -      +
    731A  ASP*     1.4    92.9    +      -       -      +
    733A  THR*     3.4     7.6    +      -       -      -
    734A  GLN*     3.1    55.1    +      -       +      +
    792A  LYS*     5.5     4.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 731 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    689A  LYS*     5.7     1.6    +      -       -      -
    727A  ALA*     2.8    19.7    +      -       -      +
    728A  MET*     3.1    22.5    +      -       +      +
    730A  HIS*     1.4    94.7    +      -       -      +
    732A  PHE*     1.4    63.1    +      -       +      +
    734A  GLN*     3.2    16.3    +      -       -      +
    735A  GLN*     3.2    30.0    +      -       -      +
    783A  PHE*     5.7     0.2    -      -       -      -
    784A  ARG*     3.5    31.2    +      -       +      -
    792A  LYS*     4.5     7.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 732 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  LEU*     3.7    16.8    -      -       +      -
    693A  HIS*     4.0    25.1    -      -       -      -
    696A  PHE*     3.6    46.4    -      +       +      -
    697A  TRP*     4.8     0.2    -      -       -      -
    720A  TYR*     3.6    28.0    -      +       -      -
    721A  LEU*     4.0    17.0    -      -       +      -
    724A  CYS*     4.3     1.8    -      -       -      -
    728A  MET*     2.9    53.2    +      -       +      +
    729A  LEU*     4.0     3.4    -      -       -      +
    731A  ASP*     1.4    73.4    -      -       +      +
    733A  THR*     1.4    55.4    +      -       -      +
    735A  GLN*     3.1    16.9    +      -       -      +
    736A  VAL*     2.8    38.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    153A  GLN*     3.3    32.5    +      -       -      +
    157A  LEU*     3.5    13.8    -      -       +      +
    729A  LEU      2.7    24.2    +      -       -      -
    730A  HIS*     3.5     9.4    -      -       -      -
    731A  ASP      3.4     0.2    -      -       -      -
    732A  PHE*     1.4    72.8    -      -       -      +
    734A  GLN*     1.3    58.7    +      -       +      +
    736A  VAL*     3.9     2.6    -      -       -      +
    737A  GLN*     3.0    57.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 734 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    730A  HIS*     3.1    38.8    +      -       +      +
    731A  ASP*     3.2     8.9    +      -       -      +
    733A  THR*     1.3    77.0    -      -       +      +
    735A  GLN*     1.3    63.1    +      -       -      +
    737A  GLN*     4.0    11.4    -      -       -      +
    738A  VAL*     3.4    28.4    +      -       -      +
    780A  PRO*     3.2    26.5    -      -       +      +
    781A  GLU*     4.4     9.7    +      -       -      +
    782A  SER*     2.8    39.7    +      -       -      +
    783A  PHE*     3.9     6.8    -      -       +      +
    792A  LYS*     6.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 735 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    693A  HIS*     3.4    13.0    +      -       -      -
    697A  TRP*     3.1    38.9    +      -       +      -
    731A  ASP*     3.2    32.1    +      -       -      +
    732A  PHE*     3.1    15.7    +      -       -      +
    734A  GLN*     1.3    72.9    -      -       -      +
    736A  VAL*     1.3    60.3    +      -       -      +
    738A  VAL*     3.5     2.7    +      -       -      +
    739A  ILE*     2.9    36.5    +      -       -      +
    783A  PHE*     4.4     7.6    -      -       +      -
    784A  ARG*     3.4    49.6    -      -       -      +
    786A  PRO*     4.1     5.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 736 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  ALA*     3.7    11.4    -      -       +      +
    157A  LEU*     3.9    10.1    -      -       +      -
    696A  PHE*     3.9    30.1    -      -       +      -
    697A  TRP*     4.3     5.6    -      -       +      -
    700A  ARG*     3.4    34.5    -      -       -      +
    732A  PHE      2.8    21.0    +      -       -      +
    733A  THR*     4.0     3.8    -      -       -      +
    735A  GLN*     1.3    78.0    -      -       -      +
    737A  GLN*     1.3    56.4    +      -       +      +
    739A  ILE*     3.6     6.1    -      -       -      +
    740A  GLU*     2.9    45.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 737 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    733A  THR*     3.0    40.4    +      -       +      +
    734A  GLN*     4.0    15.4    -      -       -      +
    735A  GLN      3.3     0.2    -      -       -      -
    736A  VAL*     1.3    75.8    -      -       +      +
    738A  VAL*     1.3    57.5    +      -       -      +
    740A  GLU*     3.5     5.7    -      -       -      +
    741A  MET*     3.0    53.9    +      -       +      +
    778A  GLN      5.6     0.2    -      -       -      +
    780A  PRO*     4.0    20.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 738 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    734A  GLN      3.4    17.6    +      -       -      +
    735A  GLN      3.9     3.4    -      -       -      +
    736A  VAL      3.4     0.2    -      -       -      -
    737A  GLN*     1.3    72.1    -      -       -      +
    739A  ILE*     1.4    63.6    +      -       +      +
    741A  MET*     3.2     8.7    +      -       -      +
    742A  LEU*     2.9    54.4    +      -       +      +
    779A  LEU*     4.4    13.5    -      -       +      -
    780A  PRO*     3.6    25.8    -      -       +      +
    783A  PHE*     3.6    47.6    -      -       +      -
    815A  PHE*     5.1     0.2    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    697A  TRP*     4.1    17.7    -      -       +      -
    700A  ARG*     4.2    14.8    -      -       -      +
    735A  GLN      2.9    28.8    +      -       -      +
    736A  VAL*     3.6    10.8    -      -       -      +
    738A  VAL*     1.4    73.6    -      -       +      +
    740A  GLU*     1.3    67.1    +      -       -      +
    742A  LEU*     3.2     1.4    +      -       -      +
    743A  GLN*     2.9    60.1    +      -       -      +
    783A  PHE*     6.2     1.6    -      -       +      -
    786A  PRO*     4.6     5.6    -      -       +      -
    832A  PHE*     3.9    17.4    -      -       +      -
    872A  THR*     3.9    18.6    -      -       +      +
    878A  MET*     4.1    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 740 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  ALA*     4.4     3.5    -      -       -      +
    700A  ARG*     3.6    14.8    +      -       -      -
    736A  VAL*     2.9    38.5    +      -       +      +
    737A  GLN*     3.5     7.4    -      -       -      +
    739A  ILE*     1.3    85.8    -      -       -      +
    741A  MET*     1.3    61.6    +      -       +      +
    743A  GLN*     3.5    22.2    +      -       -      +
    744A  LYS*     3.4    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 741 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    737A  GLN*     3.0    43.4    +      -       +      +
    738A  VAL*     3.2     6.3    +      -       -      +
    740A  GLU*     1.3    78.5    -      -       +      +
    742A  LEU*     1.4    58.1    +      -       -      +
    744A  LYS*     3.8     6.9    +      -       -      +
    745A  VAL*     3.3    27.0    +      -       -      +
    774A  LEU*     3.8    26.4    -      -       +      +
    778A  GLN*     3.4    66.0    -      -       +      +
    779A  LEU*     4.1     8.1    -      -       +      -
    780A  PRO*     4.7     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 742 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    738A  VAL*     2.9    39.2    +      -       +      +
    739A  ILE      3.9     0.7    -      -       -      +
    741A  MET*     1.4    73.5    -      -       -      +
    743A  GLN*     1.4    52.9    +      -       -      +
    744A  LYS      3.3     0.4    -      -       -      -
    745A  VAL*     3.4     5.8    +      -       +      +
    746A  THR*     2.7    40.5    +      -       -      -
    771A  LEU*     4.4    11.9    -      -       +      -
    774A  LEU*     4.0    20.4    -      -       +      -
    779A  LEU*     4.9     8.3    -      -       +      -
    783A  PHE*     5.5     0.4    -      -       +      -
    796A  LEU*     4.9     3.4    -      -       +      -
    811A  LEU*     4.4     1.5    -      -       +      +
    813A  LEU*     3.8    24.9    -      -       +      -
    815A  PHE*     4.1    12.8    -      -       +      -
    830A  ILE*     6.2     0.9    -      -       +      -
    832A  PHE*     3.6    39.5    -      -       +      -
    878A  MET*     6.0     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 743 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    700A  ARG*     5.9     0.2    -      -       -      +
    739A  ILE*     2.9    30.2    +      -       -      +
    740A  GLU*     3.5    28.7    +      -       -      +
    742A  LEU*     1.4    72.1    -      -       -      +
    744A  LYS*     1.4    62.0    +      -       +      +
    746A  THR*     3.3     4.9    +      -       -      -
    747A  LEU*     3.0    38.0    +      -       +      +
    832A  PHE*     3.7    13.0    -      -       +      -
    872A  THR*     2.7    39.7    +      -       -      +
    873A  GLY*     4.9     0.2    -      -       -      -
    876A  ILE*     3.7    29.9    -      -       +      +
----------------------------------------------------------
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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  GLU*     3.4    25.0    +      -       -      +
    741A  MET*     4.0     8.7    -      -       -      +
    742A  LEU      3.3     0.4    -      -       -      -
    743A  GLN*     1.4    74.6    -      -       +      +
    745A  VAL*     1.4    65.2    +      -       +      +
    747A  LEU*     3.2    12.3    +      -       +      +
    748A  ASP*     3.0    38.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 745 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    741A  MET      3.3    17.4    +      -       -      +
    742A  LEU*     3.4     9.0    +      -       -      +
    744A  LYS*     1.4    74.5    -      -       +      +
    746A  THR*     1.4    62.7    +      -       -      +
    748A  ASP*     3.4     6.9    +      -       -      -
    749A  ILE*     3.1    41.9    +      -       +      +
    767A  LEU*     3.9     9.6    -      -       +      -
    770A  LYS*     4.2    21.5    -      -       +      +
    771A  LEU*     4.5     9.4    -      -       +      -
    774A  LEU*     3.9    27.8    -      -       +      -
    811A  LEU*     3.8    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 746 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    742A  LEU      2.7    28.2    +      -       -      -
    743A  GLN*     3.4     9.2    -      -       -      -
    745A  VAL*     1.4    74.1    -      -       -      +
    747A  LEU*     1.3    56.1    +      -       -      +
    749A  ILE*     3.6     3.6    +      -       -      +
    750A  LYS*     3.1    28.7    +      -       +      +
    809A  LYS      5.2     5.8    -      -       -      +
    811A  LEU*     3.6    17.7    -      -       +      +
    832A  PHE*     3.4    39.2    -      -       -      +
    833A  LYS      4.0     3.6    -      -       -      -
    834A  HIS*     4.0    28.0    -      -       +      +
    876A  ILE*     4.4     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 747 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    743A  GLN*     3.0    25.9    +      -       +      +
    744A  LYS*     3.8    11.7    -      -       +      +
    746A  THR*     1.3    73.2    -      -       -      +
    748A  ASP*     1.4    62.5    +      -       -      +
    750A  LYS*     3.3     8.4    +      -       +      +
    751A  SER*     2.9    30.9    +      -       -      -
    834A  HIS*     3.4    42.8    -      -       +      +
    876A  ILE*     4.3    11.2    -      -       +      -
----------------------------------------------------------
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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*     3.0    28.4    +      -       -      +
    745A  VAL*     3.9     5.9    -      -       -      +
    747A  LEU*     1.4    75.4    -      -       -      +
    749A  ILE*     1.4    69.7    +      -       +      +
    751A  SER*     3.2    25.4    +      -       -      -
    752A  LEU*     3.4    13.2    -      -       +      +
    770A  LYS*     4.2    20.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 749 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    745A  VAL*     3.1    42.4    +      -       +      +
    746A  THR      4.0     2.2    -      -       -      +
    748A  ASP*     1.4    75.0    -      -       +      +
    750A  LYS*     1.4    63.5    +      -       -      +
    752A  LEU*     3.0    29.7    +      -       +      +
    753A  SER*     3.4    10.2    +      -       -      -
    763A  VAL*     4.0    13.9    -      -       +      -
    766A  GLN*     4.4     3.4    -      -       +      +
    767A  LEU*     4.1    34.3    -      -       +      +
    770A  LYS*     4.3    15.0    -      -       +      -
    803A  VAL*     3.9    24.0    -      -       +      -
    809A  LYS*     4.4     7.2    -      -       +      +
    811A  LEU*     3.9    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 750 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    746A  THR*     3.1    17.4    +      -       +      +
    747A  LEU*     3.4    15.3    -      -       +      +
    749A  ILE*     1.4    76.5    -      -       -      +
    751A  SER*     1.4    56.5    +      -       -      +
    752A  LEU      3.2     1.2    +      -       -      -
    753A  SER      2.9    27.2    -      -       -      +
    807A  LYS      5.3     2.0    -      -       -      +
    808A  LYS*     3.6    20.9    -      -       -      +
    809A  LYS*     3.9    28.1    -      -       +      +
    834A  HIS*     2.7    61.1    +      -       +      +
    835A  GLY*     4.0     3.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 751 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    747A  LEU      2.9    17.1    +      -       -      -
    748A  ASP*     3.4    13.9    -      -       -      -
    749A  ILE      3.2     0.6    -      -       -      -
    750A  LYS*     1.4    73.9    -      -       -      +
    752A  LEU*     1.4    64.4    +      -       -      +
    753A  SER      3.8     0.2    -      -       -      -
----------------------------------------------------------
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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