Contacts of the helix formed by residues 646 - 676 (chain F) in PDB entry 3RCW


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 THR 646 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    642F  ASN*     3.4    25.3    -      -       +      +
    643F  ALA*     3.0    31.9    +      -       +      +
    645F  ASP*     1.3    83.7    -      -       +      +
    647F  VAL*     1.3    66.9    +      -       -      +
    648F  PHE*     3.9     5.2    +      -       -      -
    649F  TYR*     3.4     6.2    +      -       -      +
    650F  ARG*     3.3    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 647 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    586F  ILE*     4.5    16.8    -      -       +      -
    646F  THR*     1.3    72.9    -      -       -      +
    648F  PHE*     1.3    72.6    +      -       +      +
    650F  ARG*     3.3     6.3    +      -       -      +
    651F  ALA*     3.0    22.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 648 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    586F  ILE*     3.3    38.1    -      -       +      -
    587F  PHE*     4.4     0.3    -      -       -      -
    638F  CYS*     3.5    17.0    -      -       -      -
    642F  ASN*     3.4    37.0    -      -       -      +
    646F  THR*     3.3     3.8    +      -       -      +
    647F  VAL*     1.3    83.2    -      -       +      +
    649F  TYR*     1.3    62.1    +      -       -      +
    651F  ALA*     3.2     7.7    +      -       -      +
    652F  ALA      2.9    19.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 649 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    638F  CYS*     4.6     7.0    -      -       -      -
    639F  MET*     3.7    38.7    -      -       +      +
    642F  ASN*     3.6    21.4    -      -       +      +
    643F  ALA      3.4    20.4    -      -       -      +
    644F  ARG*     3.4    32.9    -      -       +      +
    646F  THR*     3.4    11.3    +      -       -      +
    647F  VAL      3.3     0.2    -      -       -      -
    648F  PHE*     1.3    77.8    -      -       -      +
    650F  ARG*     1.3    61.4    +      -       +      +
    652F  ALA*     3.1     6.5    +      -       -      +
    653F  VAL*     3.0    45.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 650 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    644F  ARG      5.7     1.1    -      -       -      +
    645F  ASP      5.2     2.5    -      -       -      +
    646F  THR      3.3     9.7    +      -       -      +
    647F  VAL*     3.7     8.7    -      -       -      +
    648F  PHE      3.3     0.6    -      -       -      -
    649F  TYR*     1.3    81.5    -      -       +      +
    651F  ALA*     1.3    68.3    +      -       -      +
    653F  VAL*     2.9     9.5    +      -       -      +
    654F  ARG*     2.8    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 651 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    581F  LYS      5.7     0.2    -      -       -      +
    582F  ASP*     5.7     0.9    -      -       -      +
    586F  ILE*     3.8    28.0    -      -       +      -
    587F  PHE*     4.4    11.1    -      -       +      -
    647F  VAL*     3.0    14.9    +      -       +      +
    648F  PHE*     3.4     8.7    -      -       -      +
    650F  ARG*     1.3    75.8    -      -       -      +
    652F  ALA*     1.3    56.7    +      -       -      +
    654F  ARG*     3.4     8.7    +      -       -      +
    655F  LEU*     2.9    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 652 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587F  PHE*     3.8    12.9    -      -       +      -
    635F  ILE*     3.0    23.6    -      -       +      +
    638F  CYS*     3.7    25.6    -      -       +      -
    639F  MET*     4.1    13.5    -      -       +      -
    648F  PHE      2.9    13.5    +      -       -      +
    649F  TYR      3.4     9.0    -      -       -      +
    651F  ALA*     1.3    76.2    -      -       -      +
    653F  VAL*     1.3    56.9    +      -       -      +
    656F  ARG*     2.9    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 653 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    639F  MET*     3.9    20.0    -      -       -      -
    649F  TYR*     3.0    34.0    +      -       +      +
    650F  ARG*     2.9    11.3    +      -       -      +
    652F  ALA*     1.3    74.4    -      -       -      +
    654F  ARG*     1.3    69.0    +      -       +      +
    656F  ARG*     3.2    23.4    +      -       -      +
    657F  ASP*     3.1    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 654 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    581F  LYS      6.0     1.1    -      -       -      +
    650F  ARG*     2.8    26.3    +      -       -      +
    651F  ALA*     3.9     7.2    -      -       -      +
    653F  VAL*     1.3    74.8    -      -       +      +
    655F  LEU*     1.3    58.9    +      -       -      +
    657F  ASP*     3.3     6.0    +      -       -      +
    658F  GLN*     2.9    51.5    +      -       +      +
    572H  ARG*     5.6    10.8    -      -       -      +
    576H  ASP*     4.8    13.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 655 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578F  LEU*     3.6    26.5    -      -       +      +
    581F  LYS*     3.8    27.7    +      -       +      +
    582F  ASP*     4.5     1.3    -      -       +      +
    587F  PHE*     3.3    37.7    -      -       +      -
    609F  PHE*     4.0    18.2    -      -       +      -
    631F  PHE*     3.8    13.3    -      -       +      -
    634F  ILE*     4.8     2.5    -      -       +      -
    635F  ILE*     3.7    19.5    -      -       +      -
    651F  ALA      2.9    17.8    +      -       -      +
    652F  ALA      4.2     0.2    -      -       -      -
    654F  ARG*     1.3    75.3    -      -       -      +
    656F  ARG*     1.3    54.0    +      -       -      +
    658F  GLN*     4.9     2.2    -      -       -      -
    659F  GLY*     2.6    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 656 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631F  PHE*     4.7     6.1    -      -       +      -
    632F  ASP*     5.5     5.8    -      -       -      +
    635F  ILE*     3.5    28.7    -      -       +      +
    636F  ASP*     6.0     0.2    -      -       -      -
    639F  MET*     4.4    22.1    -      -       -      +
    652F  ALA      2.9    18.5    +      -       -      +
    653F  VAL*     3.2    21.9    +      -       -      +
    655F  LEU*     1.3    76.8    -      -       -      +
    657F  ASP*     1.3    83.7    +      -       -      +
    660F  GLY*     2.8    26.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 657 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653F  VAL*     3.1    25.0    +      -       -      +
    654F  ARG*     3.9     4.3    -      -       -      +
    656F  ARG*     1.3   105.8    +      -       -      +
    658F  GLN*     1.3    66.6    +      -       +      +
    660F  GLY*     3.3     9.2    +      -       -      -
    661F  VAL*     3.4    16.7    +      -       -      +
    664F  ARG*     5.2     1.7    +      -       -      -
    617H  GLU*     5.4     5.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 658 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    581F  LYS*     3.1    53.3    +      -       +      +
    654F  ARG*     2.9    35.6    +      -       +      +
    655F  LEU      4.3     0.9    -      -       -      +
    657F  ASP*     1.3    74.6    -      -       +      +
    659F  GLY*     1.3    67.4    +      -       -      +
    661F  VAL*     3.2    23.7    +      -       -      +
    662F  VAL*     3.4    10.9    +      -       -      +
    572H  ARG*     4.8    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 659 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578F  LEU*     4.3    12.5    -      -       -      +
    581F  LYS*     5.4     2.2    -      -       -      +
    631F  PHE*     4.0    19.5    -      -       -      -
    655F  LEU*     2.6    28.0    +      -       -      +
    656F  ARG      3.9     0.2    -      -       -      -
    658F  GLN*     1.3    73.2    -      -       -      +
    660F  GLY*     1.3    63.6    +      -       -      +
    662F  VAL*     2.9     6.6    +      -       -      +
    663F  LEU*     2.9    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 660 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631F  PHE*     4.8     1.0    -      -       -      -
    656F  ARG      2.8    18.2    +      -       -      -
    657F  ASP      3.3     2.9    +      -       -      -
    658F  GLN      3.2     0.4    -      -       -      -
    659F  GLY*     1.3    76.9    -      -       -      +
    661F  VAL*     1.3    60.9    +      -       -      +
    663F  LEU*     3.2     7.4    +      -       -      +
    664F  ARG*     2.9    42.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 661 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    657F  ASP      3.4    16.5    +      -       -      +
    658F  GLN*     3.2    12.5    +      -       -      +
    660F  GLY*     1.3    73.7    -      -       -      +
    662F  VAL*     1.3    64.3    +      -       +      +
    664F  ARG*     3.8    27.1    +      -       -      +
    665F  GLN*     3.3    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 662 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2F  EDO      5.8     1.1    +      -       -      -
    574F  VAL*     3.9    19.0    -      -       +      +
    577F  GLN*     3.8    35.9    -      -       +      +
    578F  LEU*     3.7    26.7    -      -       +      -
    581F  LYS*     4.3    19.5    -      -       +      +
    658F  GLN      3.8    11.2    -      -       -      +
    659F  GLY*     2.9     7.7    +      -       -      +
    661F  VAL*     1.3    79.7    -      -       +      +
    663F  LEU*     1.3    60.1    +      -       -      +
    665F  GLN*     3.3     7.0    +      -       +      +
    666F  ALA*     3.0    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 663 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    574F  VAL*     4.1    20.9    -      -       +      -
    578F  LEU*     4.9     4.3    -      -       +      -
    624F  LEU*     3.7    31.7    -      -       +      +
    627F  PHE*     4.3     5.8    -      -       +      -
    628F  GLU*     3.7    31.4    -      -       +      +
    631F  PHE*     3.2    44.9    -      -       +      -
    632F  ASP*     5.4     1.6    -      -       -      +
    659F  GLY      2.9    12.6    +      -       -      +
    660F  GLY*     3.9     6.3    -      -       -      +
    662F  VAL*     1.3    74.1    -      -       -      +
    664F  ARG*     1.3    61.4    +      -       -      +
    666F  ALA*     3.1     7.3    +      -       +      +
    667F  ARG*     2.9    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 664 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    657F  ASP      5.2     1.2    +      -       -      -
    660F  GLY*     2.9    30.3    +      -       -      +
    661F  VAL*     3.9    27.6    +      -       -      +
    663F  LEU*     1.3    76.7    -      -       -      +
    665F  GLN*     1.3    63.3    +      -       -      +
    667F  ARG*     3.1     9.3    +      -       +      +
    668F  ARG*     3.0    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 665 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2F  EDO      5.5     5.8    -      -       -      +
    661F  VAL*     3.3    13.0    +      -       +      +
    662F  VAL*     3.7     9.9    -      -       -      +
    663F  LEU      3.3     0.2    -      -       -      -
    664F  ARG*     1.3    76.3    -      -       -      +
    666F  ALA*     1.3    58.1    +      -       -      +
    668F  ARG*     3.4    15.5    +      -       -      +
    669F  GLU*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 666 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2F  EDO      4.9     5.5    +      -       -      -
    570F  LEU*     5.3     4.2    -      -       +      +
    571F  LEU*     6.0     0.7    -      -       +      -
    574F  VAL*     3.6    26.9    -      -       +      -
    624F  LEU*     3.9    18.4    -      -       +      -
    662F  VAL      3.0    13.4    +      -       -      +
    663F  LEU*     3.1    15.9    -      -       +      +
    665F  GLN*     1.3    74.0    -      -       -      +
    667F  ARG*     1.3    57.4    +      -       -      -
    669F  GLU*     3.3     7.3    +      -       -      +
    670F  VAL*     2.9    32.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 667 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    624F  LEU*     3.6    24.3    -      -       +      +
    628F  GLU*     5.2     9.6    -      -       -      +
    663F  LEU      2.9    12.6    +      -       -      +
    664F  ARG*     3.1    10.7    +      -       +      +
    666F  ALA*     1.3    71.8    -      -       -      +
    668F  ARG*     1.3    64.1    +      -       +      +
    670F  VAL*     2.9    21.7    +      -       -      +
    671F  ASP*     3.0    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 668 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    664F  ARG*     3.0    23.9    +      -       +      +
    665F  GLN*     3.5    15.3    -      -       -      +
    667F  ARG*     1.3    76.1    -      -       +      +
    669F  GLU*     1.3    57.8    +      -       -      +
    671F  ASP*     3.2     9.2    +      -       -      +
    672F  SER*     2.8    28.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 669 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2F  EDO      5.1     3.1    -      -       -      +
    570F  LEU*     3.8    31.2    -      -       +      -
    665F  GLN      2.9    16.2    +      -       -      +
    666F  ALA*     3.6     8.1    -      -       -      +
    668F  ARG*     1.3    75.9    -      -       -      +
    670F  VAL*     1.3    65.1    +      -       -      +
    672F  SER*     3.8    18.1    +      -       -      -
    673F  ILE*     3.0    40.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 670 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    567F  LEU*     4.9    12.6    -      -       +      -
    570F  LEU*     4.7    15.0    -      -       +      -
    624F  LEU*     4.1    23.8    -      -       +      +
    666F  ALA*     2.9    27.2    +      -       +      +
    667F  ARG*     2.9    17.1    +      -       -      +
    669F  GLU*     1.3    76.4    -      -       -      +
    671F  ASP*     1.3    61.7    +      -       -      +
    673F  ILE*     4.1     5.8    -      -       -      +
    674F  GLY*     3.3    18.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 671 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    667F  ARG*     3.0    28.0    +      -       -      +
    668F  ARG*     3.8     8.1    -      -       -      +
    670F  VAL*     1.3    84.5    -      -       -      +
    672F  SER*     1.3    65.6    +      -       -      +
    673F  ILE      3.3     0.2    -      -       -      -
    674F  GLY*     3.0     4.2    +      -       -      +
    675F  LEU*     2.9    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 672 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668F  ARG      2.8    20.6    +      -       -      -
    669F  GLU*     3.3    22.9    +      -       -      -
    671F  ASP*     1.3    72.1    -      -       -      +
    673F  ILE*     1.3    64.1    +      -       -      +
    675F  LEU*     2.9    18.4    +      -       -      +
    676F  GLU*     3.3    10.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 673 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    566F  PRO*     5.2    15.7    -      -       +      -
    570F  LEU*     3.5    32.5    -      -       +      -
    669F  GLU*     3.0    30.4    +      -       +      +
    670F  VAL*     4.1     5.8    -      -       -      +
    672F  SER*     1.3    74.6    +      -       -      +
    674F  GLY*     1.3    64.2    +      -       -      +
    676F  GLU*     3.1    24.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 674 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    670F  VAL      3.3    10.9    +      -       -      -
    671F  ASP*     3.0    10.5    +      -       -      -
    673F  ILE*     1.3    80.3    -      -       -      +
    675F  LEU*     1.3    58.4    +      -       -      +
    676F  GLU      4.5     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 675 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    671F  ASP      2.9     8.7    +      -       -      +
    672F  SER*     2.9    13.0    +      -       -      +
    674F  GLY*     1.3    73.3    -      -       -      +
    676F  GLU*     1.3    66.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 676 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    672F  SER      3.3     8.2    +      -       -      +
    673F  ILE*     3.1    19.7    +      -       +      +
    674F  GLY      4.5     2.9    -      -       -      +
    675F  LEU*     1.3    80.9    -      -       -      +
----------------------------------------------------------
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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