Contacts of the helix formed by residues 646 - 673 (chain H) 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 H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    642H  ASN*     4.8     3.1    -      -       -      -
    643H  ALA*     3.0    28.9    +      -       -      +
    644H  ARG      2.7    20.0    +      -       -      +
    645H  ASP*     1.3    77.9    -      -       -      +
    647H  VAL*     1.3    64.6    +      -       -      +
    648H  PHE*     3.3    14.4    +      -       -      -
    649H  TYR      3.6     3.3    +      -       -      -
    650H  ARG*     3.6     8.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 647 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    594E  LYS      3.8    22.2    -      -       -      +
    595E  GLU*     4.5     8.3    -      -       -      +
    597E  PRO*     4.1    17.5    -      -       +      +
    645H  ASP      4.0     0.4    +      -       -      -
    646H  THR*     1.3    74.8    -      -       -      +
    648H  PHE*     1.3    61.1    +      -       +      +
    650H  ARG*     3.3    18.1    +      -       -      +
    651H  ALA*     2.6    37.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 648 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    594E  LYS*     5.1    10.1    -      -       +      -
    586H  ILE*     3.7    42.2    -      -       +      -
    638H  CYS*     3.6    19.5    -      -       -      -
    642H  ASN*     3.5    36.8    -      -       +      -
    646H  THR*     3.1     5.1    -      -       -      -
    647H  VAL*     1.3    85.1    -      -       +      +
    649H  TYR*     1.3    58.4    +      -       -      +
    651H  ALA*     4.0     4.7    -      -       -      -
    652H  ALA*     2.6    37.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 649 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    638H  CYS*     4.6     2.2    -      -       -      -
    639H  MET*     3.6    59.7    -      -       +      +
    642H  ASN*     4.4     9.4    -      -       -      +
    643H  ALA      3.5     7.9    +      -       -      +
    644H  ARG*     3.5    42.6    -      -       +      +
    646H  THR      3.6     1.6    +      -       -      -
    647H  VAL      3.5     0.6    -      -       -      -
    648H  PHE*     1.3    78.4    -      -       -      +
    650H  ARG*     1.3    57.6    +      -       +      +
    652H  ALA*     3.6     4.7    -      -       -      +
    653H  VAL*     2.7    51.9    +      -       +      +
    656H  ARG*     5.8     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 650 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    595E  GLU      5.8     1.0    +      -       -      -
    597E  PRO*     5.4     5.3    -      -       -      +
    644H  ARG*     3.2    27.7    +      -       -      +
    645H  ASP*     4.5    11.1    +      -       -      +
    646H  THR      3.6     2.5    -      -       -      -
    647H  VAL*     3.3    28.1    +      -       -      +
    648H  PHE      3.3     0.4    -      -       -      -
    649H  TYR*     1.3    81.4    -      -       +      +
    651H  ALA*     1.3    54.7    +      -       -      +
    653H  VAL*     3.0    12.5    +      -       +      +
    654H  ARG*     2.8    34.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 651 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    597E  PRO*     4.3    19.0    -      -       +      +
    586H  ILE*     4.2    20.6    -      -       +      -
    587H  PHE*     4.6     8.6    -      -       +      -
    647H  VAL      2.6    22.9    +      -       -      +
    648H  PHE*     3.6     8.7    -      -       -      +
    650H  ARG*     1.3    68.0    -      -       -      +
    652H  ALA*     1.3    55.2    +      -       -      +
    654H  ARG*     3.0     7.2    +      -       -      +
    655H  LEU*     2.8    36.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 652 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    587H  PHE*     4.0    13.9    -      -       +      -
    635H  ILE*     3.6    18.4    -      -       +      +
    638H  CYS*     3.6    21.8    -      -       -      -
    639H  MET*     3.8    17.7    -      -       +      -
    648H  PHE      2.6    21.9    +      -       -      +
    649H  TYR      3.8     3.4    -      -       -      +
    651H  ALA*     1.3    74.1    -      -       -      +
    653H  VAL*     1.3    60.8    +      -       -      +
    655H  LEU*     4.5     2.5    -      -       -      -
    656H  ARG*     3.1    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 653 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    639H  MET*     4.4    10.8    -      -       -      -
    649H  TYR*     2.7    43.3    +      -       +      +
    650H  ARG*     3.0    14.7    +      -       +      +
    652H  ALA*     1.3    74.5    -      -       -      +
    654H  ARG*     1.3    63.6    +      -       +      +
    656H  ARG*     3.3    20.9    +      -       -      +
    657H  ASP*     3.1    39.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 654 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    598E  ASP*     6.1     4.5    -      -       +      -
    601E  ASP*     5.8     2.2    -      -       -      +
    650H  ARG      2.8    17.7    +      -       -      +
    651H  ALA*     3.0     7.1    +      -       -      +
    653H  VAL*     1.3    74.4    -      -       +      +
    655H  LEU*     1.3    60.3    +      -       -      +
    657H  ASP*     3.3     5.1    +      -       -      +
    658H  GLN*     3.0    52.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 655 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578H  LEU*     4.1    10.5    -      -       +      +
    581H  LYS*     3.8    36.1    +      -       +      +
    582H  ASP*     4.8     2.9    -      -       +      +
    587H  PHE*     3.6    31.2    -      -       +      -
    609H  PHE*     3.9    21.1    -      -       +      -
    631H  PHE*     3.3    15.7    -      -       +      -
    634H  ILE*     4.6     2.9    -      -       +      -
    635H  ILE*     3.8    21.8    -      -       +      -
    651H  ALA      2.8    16.2    +      -       -      +
    652H  ALA*     4.0     1.1    -      -       -      +
    654H  ARG*     1.3    77.1    -      -       -      +
    656H  ARG*     1.3    55.7    +      -       -      +
    658H  GLN*     4.9     1.6    -      -       -      -
    659H  GLY*     2.7    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 656 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631H  PHE*     4.4     7.3    -      -       +      -
    632H  ASP*     6.1     0.9    -      -       -      +
    635H  ILE*     3.7    32.3    -      -       +      +
    636H  ASP*     5.7     1.3    -      -       -      -
    639H  MET*     4.4    21.3    -      -       -      +
    649H  TYR*     5.8     0.8    +      -       -      -
    652H  ALA      3.1    18.2    +      -       -      +
    653H  VAL*     3.4    20.4    +      -       -      +
    654H  ARG      3.2     0.2    -      -       -      -
    655H  LEU*     1.3    79.1    -      -       -      +
    657H  ASP*     1.3    80.8    +      -       -      +
    660H  GLY*     2.9    26.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 657 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653H  VAL*     3.1    24.3    +      -       -      +
    654H  ARG*     3.3     4.5    +      -       -      +
    656H  ARG*     1.3   108.0    +      -       -      +
    658H  GLN*     1.3    65.3    +      -       +      +
    660H  GLY*     3.5     1.4    +      -       -      -
    661H  VAL*     3.4    24.9    +      -       -      +
    664H  ARG*     4.9     3.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 658 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    601E  ASP*     4.1    26.3    +      -       -      +
    581H  LYS*     3.5    46.8    -      -       +      +
    654H  ARG*     3.0    31.9    +      -       -      +
    657H  ASP*     1.3    76.0    -      -       +      +
    659H  GLY*     1.3    66.0    +      -       -      +
    661H  VAL*     3.2    17.0    +      -       -      +
    662H  VAL*     3.4    15.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 659 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    578H  LEU*     3.5    24.1    -      -       -      +
    581H  LYS*     4.4     3.4    -      -       -      +
    631H  PHE*     3.8     8.3    -      -       -      -
    655H  LEU*     2.7    26.6    +      -       -      -
    656H  ARG      3.9     0.2    -      -       -      -
    658H  GLN*     1.3    76.3    -      -       -      +
    660H  GLY*     1.3    59.5    +      -       -      -
    662H  VAL*     3.3     5.5    +      -       -      +
    663H  LEU*     3.1    26.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 660 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    631H  PHE*     4.5     2.2    -      -       -      -
    656H  ARG      2.9    21.1    +      -       -      -
    657H  ASP      3.5     2.2    +      -       -      -
    658H  GLN      3.2     0.4    -      -       -      -
    659H  GLY*     1.3    76.5    -      -       -      +
    661H  VAL*     1.3    56.3    +      -       -      +
    663H  LEU*     3.3     8.8    +      -       -      +
    664H  ARG*     2.9    49.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 661 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    657H  ASP      3.4    15.0    +      -       -      +
    658H  GLN*     3.2    10.7    +      -       -      +
    659H  GLY      3.1     0.6    -      -       -      -
    660H  GLY*     1.3    74.7    -      -       -      +
    662H  VAL*     1.3    67.3    +      -       +      +
    664H  ARG*     3.2    29.7    +      -       -      +
    665H  GLN*     3.1    24.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 662 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    574H  VAL*     3.9    29.8    -      -       +      +
    577H  GLN*     3.6    39.9    -      -       +      +
    578H  LEU*     4.1    11.4    -      -       +      -
    581H  LYS*     4.2    22.0    -      -       +      +
    658H  GLN      3.7    12.3    -      -       -      +
    659H  GLY*     3.3     7.4    +      -       -      +
    661H  VAL*     1.3    78.6    -      -       +      +
    663H  LEU*     1.3    57.8    +      -       -      +
    665H  GLN*     3.3     8.7    +      -       -      +
    666H  ALA*     3.0    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 663 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    574H  VAL*     3.9    25.4    -      -       +      -
    578H  LEU*     4.8     3.6    -      -       +      -
    624H  LEU*     4.4    17.2    -      -       +      +
    627H  PHE*     4.1    17.9    -      -       +      -
    628H  GLU*     4.1    32.4    -      -       +      +
    631H  PHE*     3.4    39.0    -      -       +      -
    632H  ASP*     5.6     0.2    -      -       -      +
    659H  GLY      3.1    18.5    +      -       -      +
    660H  GLY*     3.8     7.4    -      -       -      +
    662H  VAL*     1.3    74.0    -      -       -      +
    664H  ARG*     1.3    61.2    +      -       +      +
    665H  GLN      3.1     1.6    -      -       -      -
    666H  ALA*     3.2     4.6    +      -       -      +
    667H  ARG*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 664 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    657H  ASP*     4.9     3.2    +      -       -      +
    660H  GLY*     2.9    38.5    +      -       -      +
    661H  VAL*     3.2    31.5    -      -       -      +
    663H  LEU*     1.3    75.8    -      -       +      +
    665H  GLN*     1.3    60.5    +      -       -      +
    667H  ARG*     3.4     9.7    +      -       -      +
    668H  ARG*     3.1    42.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 665 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    661H  VAL*     3.1    16.2    +      -       +      +
    662H  VAL*     3.4    12.1    -      -       -      +
    663H  LEU      3.1     0.2    -      -       -      -
    664H  ARG*     1.3    75.6    -      -       -      +
    666H  ALA*     1.3    62.7    +      -       -      +
    668H  ARG*     3.1    38.4    +      -       -      +
    669H  GLU*     3.3    46.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 666 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    570H  LEU*     4.2     9.2    -      -       +      +
    574H  VAL*     3.6    30.1    -      -       +      -
    624H  LEU*     3.4    22.4    -      -       +      -
    662H  VAL      3.0    11.5    +      -       -      +
    663H  LEU*     3.2     8.7    +      -       -      +
    665H  GLN*     1.3    73.3    -      -       -      +
    667H  ARG*     1.3    66.0    +      -       -      +
    669H  GLU*     3.1    10.8    +      -       -      +
    670H  VAL*     2.9    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 667 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    624H  LEU*     3.0    40.1    -      -       +      +
    625H  HIS*     4.0    16.2    +      -       -      +
    628H  GLU*     4.1     6.2    +      -       -      +
    663H  LEU      2.9    13.4    +      -       -      +
    664H  ARG*     3.4    15.0    -      -       -      +
    666H  ALA*     1.3    77.0    -      -       -      +
    668H  ARG*     1.3    55.2    +      -       +      +
    670H  VAL*     3.3    29.3    +      -       -      +
    671H  ASP*     2.9    54.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 668 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    664H  ARG*     3.1    27.8    +      -       -      +
    665H  GLN*     3.1    42.3    +      -       -      +
    667H  ARG*     1.3    79.9    -      -       +      +
    669H  GLU*     1.3    64.6    +      -       -      +
    671H  ASP*     3.4    15.7    -      -       -      +
    672H  SER*     3.3    19.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 669 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    570H  LEU*     4.7    18.8    -      -       +      -
    665H  GLN*     3.4    34.1    +      -       +      +
    666H  ALA*     3.1    10.7    +      -       -      +
    668H  ARG*     1.3    76.3    -      -       -      +
    670H  VAL*     1.3    64.7    +      -       -      +
    672H  SER*     2.7    26.3    +      -       -      -
    673H  ILE*     3.1     9.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 670 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    570H  LEU*     4.2    13.2    -      -       +      +
    624H  LEU*     4.1    27.6    -      -       +      +
    666H  ALA      2.9    16.1    +      -       -      +
    667H  ARG*     3.4    24.9    -      -       -      +
    669H  GLU*     1.3    76.3    -      -       -      +
    671H  ASP*     1.3    64.8    +      -       -      +
    673H  ILE*     3.0    27.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 671 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    667H  ARG*     2.9    40.2    +      -       -      +
    668H  ARG*     3.4    22.4    -      -       -      +
    670H  VAL*     1.3    77.6    -      -       -      +
    672H  SER*     1.3    60.8    +      -       -      +
    673H  ILE      4.2     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 672 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668H  ARG      3.3     5.8    +      -       -      -
    669H  GLU*     2.7    34.0    +      -       -      -
    671H  ASP*     1.3    79.4    -      -       -      +
    673H  ILE*     1.3    64.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 673 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    566H  PRO*     6.3     3.4    -      -       +      -
    669H  GLU      3.1    10.9    +      -       -      +
    670H  VAL*     3.0    21.6    +      -       +      +
    671H  ASP      4.2     3.3    -      -       -      +
    672H  SER*     1.3    81.8    +      -       -      +
----------------------------------------------------------
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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