Contacts of the helix formed by residues 646 - 674 (chain G) 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 G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    642G  ASN*     3.6    12.2    -      -       +      +
    643G  ALA*     2.9    32.6    +      -       +      +
    644G  ARG      3.5     0.8    +      -       -      -
    645G  ASP*     1.3    90.9    -      -       -      +
    647G  VAL*     1.3    66.4    +      -       -      +
    648G  PHE*     3.6     5.0    +      -       -      -
    649G  TYR*     3.2    14.6    +      -       -      +
    650G  ARG*     3.2    28.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 647 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    594A  LYS      3.9    17.0    -      -       -      +
    595A  GLU*     3.9    22.7    -      -       -      +
    597A  PRO*     4.5    11.1    -      -       +      +
    646G  THR*     1.3    72.2    -      -       -      +
    648G  PHE*     1.3    81.1    +      -       +      +
    650G  ARG*     3.6    20.3    +      -       -      +
    651G  ALA*     3.0    28.6    +      -       -      +
    654G  ARG*     5.2     0.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 648 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    594A  LYS*     4.5    10.1    -      -       +      -
    586G  ILE*     3.8    43.7    -      -       +      -
    587G  PHE*     4.3     0.2    -      -       -      -
    638G  CYS*     3.5    15.6    -      -       -      -
    642G  ASN*     3.8    32.8    -      -       -      +
    646G  THR*     3.2     4.9    +      -       -      +
    647G  VAL*     1.3    92.0    -      -       +      +
    649G  TYR*     1.3    66.2    +      -       -      +
    651G  ALA*     3.0     6.0    +      -       -      +
    652G  ALA      3.0    18.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 649 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    638G  CYS*     4.6     3.1    -      -       -      -
    639G  MET*     3.3    47.2    -      -       +      +
    642G  ASN*     3.4    24.9    -      -       -      +
    643G  ALA      3.3    18.4    -      -       -      +
    644G  ARG*     3.6    38.8    -      -       +      +
    646G  THR*     3.2     8.2    +      -       -      +
    648G  PHE*     1.3    75.0    -      -       -      +
    650G  ARG*     1.3    69.8    +      -       +      +
    652G  ALA*     3.0     9.5    +      -       -      +
    653G  VAL*     3.0    37.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 650 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    644G  ARG      4.4    13.5    +      -       -      +
    645G  ASP*     3.6    33.7    +      -       -      +
    646G  THR*     3.2    21.3    +      -       -      +
    647G  VAL*     3.8    19.8    -      -       -      +
    649G  TYR*     1.3    83.7    -      -       +      +
    651G  ALA*     1.3    61.5    +      -       -      +
    653G  VAL*     3.6     7.8    +      -       -      +
    654G  ARG*     3.1    49.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 651 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    597A  PRO*     4.1    22.7    -      -       +      -
    586G  ILE*     4.3     8.1    -      -       +      -
    587G  PHE*     4.0    18.1    -      -       +      -
    647G  VAL      3.0    19.0    +      -       -      +
    648G  PHE*     3.0     6.0    +      -       -      +
    650G  ARG*     1.3    74.2    -      -       -      +
    652G  ALA*     1.3    61.5    +      -       -      +
    654G  ARG*     3.3    12.7    +      -       -      +
    655G  LEU*     2.8    30.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 652 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587G  PHE*     3.8    10.7    -      -       +      -
    635G  ILE*     3.6    19.9    -      -       +      +
    638G  CYS*     3.8    26.7    -      -       +      -
    639G  MET*     3.9    15.0    -      -       +      -
    648G  PHE      3.0    11.2    +      -       -      +
    649G  TYR      3.0    10.1    +      -       -      +
    651G  ALA*     1.3    74.0    -      -       -      +
    653G  VAL*     1.3    56.3    +      -       -      +
    655G  LEU*     3.1     0.9    +      -       -      -
    656G  ARG*     2.8    35.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 653 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    639G  MET*     3.7    18.8    -      -       +      -
    649G  TYR*     3.0    42.6    +      -       +      +
    650G  ARG*     3.7    10.5    -      -       -      +
    652G  ALA*     1.3    75.0    -      -       -      +
    654G  ARG*     1.3    65.3    +      -       +      +
    656G  ARG*     3.4    23.4    +      -       -      +
    657G  ASP*     3.1    39.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 654 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    597A  PRO*     4.4    14.1    -      -       -      +
    598A  ASP*     3.5    53.0    +      -       -      +
    601A  ASP*     4.4     2.2    -      -       -      -
    641A  TYR*     5.5     0.4    +      -       -      -
    650G  ARG*     3.1    54.6    +      -       -      +
    651G  ALA*     3.6    13.3    -      -       -      +
    652G  ALA      3.2     0.4    -      -       -      -
    653G  VAL*     1.3    79.6    -      -       +      +
    655G  LEU*     1.3    55.9    +      -       -      +
    657G  ASP*     3.4     8.4    +      -       -      +
    658G  GLN*     3.0    54.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 655 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578G  LEU*     3.7    24.5    -      -       -      +
    581G  LYS*     3.9    24.2    -      -       +      +
    582G  ASP*     4.5     2.2    -      -       +      -
    587G  PHE*     3.5    36.6    -      -       +      -
    609G  PHE*     4.0    20.6    -      -       +      -
    631G  PHE*     3.5    12.8    -      -       +      -
    634G  ILE*     4.4     3.1    -      -       +      -
    635G  ILE*     3.8    18.2    -      -       +      -
    651G  ALA      2.8    17.0    +      -       -      +
    652G  ALA      3.8     2.7    -      -       -      +
    654G  ARG*     1.3    72.8    -      -       -      +
    656G  ARG*     1.3    58.0    +      -       -      +
    658G  GLN*     4.5     2.2    -      -       -      +
    659G  GLY*     2.7    36.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 656 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631G  PHE*     4.5     7.1    -      -       +      -
    632G  ASP*     6.0     1.6    -      -       -      +
    635G  ILE*     3.8    29.8    -      -       +      +
    639G  MET*     4.1    23.6    -      -       -      +
    652G  ALA      2.8    16.7    +      -       -      +
    653G  VAL*     3.4    25.7    -      -       -      +
    655G  LEU*     1.3    71.9    -      -       -      +
    657G  ASP*     1.3    75.5    +      -       -      +
    660G  GLY*     2.7    32.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 657 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653G  VAL*     3.1    26.6    +      -       -      +
    654G  ARG*     3.8     9.6    -      -       -      +
    655G  LEU      3.4     0.2    -      -       -      -
    656G  ARG*     1.3   103.5    +      -       -      +
    658G  GLN*     1.3    67.0    +      -       +      +
    660G  GLY*     3.6     3.8    +      -       -      -
    661G  VAL*     3.5    19.1    +      -       -      +
    664G  ARG*     4.9     2.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 658 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    601A  ASP*     3.3    30.3    +      -       -      +
    668B  ARG*     5.6     9.2    -      -       -      +
    581G  LYS*     3.5    41.9    -      -       +      +
    654G  ARG*     3.0    36.6    +      -       -      +
    655G  LEU*     4.4     1.8    -      -       -      +
    657G  ASP*     1.3    80.1    -      -       +      +
    659G  GLY*     1.3    65.6    -      -       -      +
    661G  VAL*     3.3    22.5    +      -       -      +
    662G  VAL*     3.6    11.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 659 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578G  LEU*     3.6    23.6    -      -       -      -
    581G  LYS*     4.8     2.9    -      -       -      +
    631G  PHE*     3.8     7.9    -      -       -      -
    655G  LEU*     2.7    25.1    +      -       -      +
    658G  GLN*     1.3    70.5    -      -       -      +
    660G  GLY*     1.3    63.4    +      -       -      -
    662G  VAL*     3.2     5.8    +      -       -      +
    663G  LEU*     3.1    27.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 660 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631G  PHE*     4.6     2.7    -      -       -      -
    656G  ARG      2.7    23.4    +      -       -      -
    657G  ASP      3.6     2.2    +      -       -      -
    659G  GLY*     1.3    71.5    -      -       -      +
    661G  VAL*     1.3    55.3    +      -       -      +
    663G  LEU*     3.4     7.8    +      -       -      +
    664G  ARG*     2.8    52.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 661 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668B  ARG*     3.5    52.0    -      -       +      +
    671B  ASP*     6.0     2.2    -      -       +      +
    657G  ASP      3.5    17.6    +      -       -      +
    658G  GLN*     3.5    10.5    -      -       -      +
    659G  GLY      3.2     0.6    -      -       -      -
    660G  GLY*     1.3    75.0    -      -       -      +
    662G  VAL*     1.3    60.5    +      -       +      +
    664G  ARG*     3.3    22.1    +      -       -      +
    665G  GLN*     2.9    29.1    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 662 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    671B  ASP*     4.7     8.5    -      -       +      +
    675B  LEU*     3.7     4.7    -      -       +      +
    574G  VAL*     4.0    26.0    -      -       +      -
    577G  GLN*     3.8    36.6    -      -       +      +
    578G  LEU*     4.1    13.2    -      -       +      -
    581G  LYS*     4.4    20.2    -      -       +      -
    658G  GLN      3.6    14.8    -      -       -      +
    659G  GLY*     3.2     7.5    +      -       -      +
    661G  VAL*     1.3    78.7    -      -       +      +
    663G  LEU*     1.3    58.9    +      -       -      +
    665G  GLN*     3.2     7.8    +      -       -      +
    666G  ALA*     2.8    26.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 663 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    574G  VAL*     3.7    27.4    -      -       +      -
    578G  LEU*     4.6     5.4    -      -       +      -
    624G  LEU*     4.1    11.8    -      -       +      +
    627G  PHE*     4.1    19.1    -      -       +      -
    628G  GLU*     4.0    32.7    -      -       +      +
    631G  PHE*     3.7    35.4    -      -       +      -
    632G  ASP*     5.3     2.0    -      -       -      +
    659G  GLY      3.1    17.6    +      -       -      +
    660G  GLY*     3.8     6.5    -      -       -      +
    662G  VAL*     1.3    76.3    -      -       -      +
    664G  ARG*     1.3    65.8    +      -       +      +
    665G  GLN      3.1     0.9    -      -       -      -
    666G  ALA*     3.7     3.1    -      -       +      +
    667G  ARG*     2.9    23.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 664 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    657G  ASP      4.9     1.6    +      -       -      -
    660G  GLY*     2.8    36.3    +      -       -      +
    661G  VAL*     3.8    31.8    -      -       -      +
    663G  LEU*     1.3    71.5    -      -       -      +
    665G  GLN*     1.3    59.3    +      -       -      +
    667G  ARG*     3.4     8.6    +      -       -      +
    668G  ARG*     2.9    40.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 665 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668B  ARG      5.6     0.4    -      -       -      +
    671B  ASP*     5.5     0.9    -      -       +      -
    672B  SER*     3.1    46.1    +      -       -      +
    675B  LEU*     4.0    11.7    -      -       +      -
    661G  VAL*     2.9    19.3    +      -       +      +
    662G  VAL*     3.5     7.9    -      -       -      +
    663G  LEU      3.1     0.4    -      -       -      -
    664G  ARG*     1.3    75.4    -      -       -      +
    666G  ALA*     1.3    64.3    +      -       -      +
    668G  ARG*     3.0    52.3    +      -       -      +
    669G  GLU*     3.3    31.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 666 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    675B  LEU*     3.8     7.1    -      -       +      +
    570G  LEU*     3.9     6.6    -      -       +      +
    574G  VAL*     3.6    27.4    -      -       +      -
    624G  LEU*     3.7    19.3    -      -       +      -
    662G  VAL      2.8    17.1    +      -       -      +
    663G  LEU*     3.2     7.6    +      -       -      +
    665G  GLN*     1.3    75.7    -      -       -      +
    667G  ARG*     1.3    64.2    +      -       -      +
    669G  GLU*     3.1     9.7    +      -       -      +
    670G  VAL*     3.0    24.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 667 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1G  EDO      3.2    44.4    +      -       -      -
    624G  LEU*     3.5    26.1    -      -       +      +
    625G  HIS*     4.0     9.1    +      -       -      +
    628G  GLU*     4.0    14.4    +      -       -      +
    663G  LEU      2.9    13.6    +      -       -      +
    664G  ARG*     3.5    14.1    -      -       -      +
    666G  ALA*     1.3    77.4    -      -       -      +
    668G  ARG*     1.3    57.9    +      -       +      +
    670G  VAL*     3.4    14.2    +      -       -      +
    671G  ASP*     2.9    48.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 668 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    664G  ARG*     2.9    28.5    +      -       -      +
    665G  GLN*     3.0    39.5    +      -       -      +
    667G  ARG*     1.3    74.6    -      -       +      +
    669G  GLU*     1.3    68.1    +      -       -      +
    671G  ASP*     3.3    17.5    -      -       -      +
    672G  SER*     3.1    23.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 669 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    672B  SER*     4.9     4.7    +      -       -      +
    675B  LEU*     3.9    31.1    -      -       +      +
    676B  GLU*     4.4     8.2    -      -       -      +
    679B  SER*     4.2    21.8    +      -       -      -
    570G  LEU*     4.1    18.2    -      -       +      -
    665G  GLN*     3.3    31.2    +      -       -      +
    666G  ALA*     3.1    10.5    +      -       -      +
    668G  ARG*     1.3    79.7    -      -       -      +
    670G  VAL*     1.3    51.8    +      -       -      +
    672G  SER*     2.9    10.4    +      -       -      -
    673G  ILE*     2.7    45.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 670 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1G  EDO      3.6    35.4    -      -       -      +
    567G  LEU*     5.0     7.0    -      -       +      -
    570G  LEU*     3.8    17.9    -      -       +      +
    624G  LEU*     4.3    14.6    -      -       +      -
    666G  ALA      3.0    14.1    +      -       -      +
    667G  ARG*     3.7    19.5    -      -       -      +
    669G  GLU*     1.3    72.1    -      -       -      +
    671G  ASP*     1.3    68.1    +      -       -      +
    673G  ILE*     4.6     6.1    -      -       +      +
    674G  GLY*     2.8    24.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 671 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    667G  ARG*     2.9    42.4    +      -       -      +
    668G  ARG*     3.3    21.9    -      -       -      +
    670G  VAL*     1.3    76.6    -      -       -      +
    672G  SER*     1.3    63.5    +      -       -      +
    674G  GLY*     3.7     4.9    +      -       -      -
    675G  LEU*     3.7    18.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 672 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    679B  SER*     5.5     4.9    -      -       -      -
    668G  ARG      3.1    10.3    +      -       -      -
    669G  GLU*     2.9    15.2    +      -       -      -
    671G  ASP*     1.3    76.9    -      -       -      +
    673G  ILE*     1.3    68.3    +      -       -      +
    675G  LEU*     3.2    26.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 673 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    678B  ALA*     3.6    33.0    -      -       +      +
    679B  SER*     3.9    25.8    -      -       -      +
    566G  PRO*     4.4    24.0    -      -       +      +
    567G  LEU*     6.3     0.4    -      -       -      -
    570G  LEU*     5.0     5.4    -      -       +      -
    669G  GLU*     2.7    34.7    +      -       +      +
    670G  VAL*     4.4     5.4    -      -       -      +
    672G  SER*     1.3    75.6    -      -       -      +
    674G  GLY*     1.3    61.5    +      -       -      +
    675G  LEU      3.2     9.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 674 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    670G  VAL*     2.8    20.7    +      -       -      -
    671G  ASP      4.1     3.1    -      -       -      -
    672G  SER      3.2     0.4    -      -       -      -
    673G  ILE*     1.3    76.6    -      -       -      +
    675G  LEU*     1.3    60.1    +      -       -      +
----------------------------------------------------------
 Back to top of page


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