Contacts of the helix formed by residues 633 - 658 (chain A) in PDB entry 3VF1


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 ASP 633 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  LYS*     3.4    30.0    +      -       -      +
    119A  ALA*     3.0    25.1    +      -       -      +
    494A  ILE*     5.7     1.3    -      -       +      -
    495A  TYR*     2.7    35.8    +      -       +      +
    631A  PHE*     3.7     0.9    -      -       -      +
    632A  GLY*     1.3    78.2    +      -       -      +
    634A  ALA*     1.3    64.7    +      -       -      +
    635A  ALA*     4.3     8.7    -      -       +      +
    636A  ALA*     3.0    18.8    +      -       +      +
    637A  HIS*     3.3    11.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 634 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    632A  GLY      3.3     4.3    +      -       -      +
    633A  ASP*     1.3    72.3    -      -       -      +
    635A  ALA*     1.3    61.3    +      -       -      +
    637A  HIS*     3.4    17.0    +      -       +      +
    638A  ALA*     3.1    21.1    +      -       -      +
    641B  ALA      4.6     2.3    -      -       -      +
    644B  LYS*     4.3    10.1    -      -       +      +
    645B  SER*     3.9    14.5    -      -       -      +
    648B  ALA*     4.0    27.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 635 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    494A  ILE*     3.4    37.1    -      -       +      +
    633A  ASP*     3.1     5.3    -      -       +      +
    634A  ALA*     1.3    77.2    -      -       -      +
    636A  ALA*     1.3    63.7    +      -       -      +
    638A  ALA*     3.3     4.9    +      -       -      +
    639A  ALA*     3.2    15.9    +      -       -      +
    645B  SER*     3.5    18.7    +      -       -      +
    649B  ASN*     6.1     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 636 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491A  ILE*     4.1     9.3    -      -       +      +
    494A  ILE*     3.8    10.2    -      -       +      +
    495A  TYR*     3.9    10.3    +      -       -      +
    631A  PHE*     3.5    41.7    -      -       +      -
    633A  ASP*     3.0    12.6    +      -       -      +
    635A  ALA*     1.3    77.3    -      -       -      +
    637A  HIS*     1.3    59.8    +      -       -      +
    639A  ALA*     3.1     4.3    +      -       -      +
    640A  MET*     2.9    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 637 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    629A  ASN*     3.0    23.3    +      -       -      -
    631A  PHE*     2.9    29.0    +      -       +      -
    632A  GLY*     3.7    18.2    -      -       -      -
    633A  ASP      3.3     7.7    +      -       -      -
    634A  ALA*     3.6    14.9    -      -       +      +
    635A  ALA      3.3     0.2    -      -       -      -
    636A  ALA*     1.3    78.6    -      -       -      +
    638A  ALA*     1.3    57.7    +      -       -      +
    640A  MET*     3.4    12.3    +      -       +      +
    641A  ALA*     2.9    30.0    +      -       -      +
    641B  ALA*     4.1     6.5    -      -       +      +
    644B  LYS*     6.2     0.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 638 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634A  ALA      3.1    13.4    +      -       -      +
    635A  ALA*     3.5     9.6    -      -       -      +
    636A  ALA      3.2     0.2    -      -       -      -
    637A  HIS*     1.3    77.9    -      -       -      +
    639A  ALA*     1.3    61.8    +      -       -      +
    641A  ALA*     3.4     1.9    +      -       -      +
    642A  LYS*     3.0    24.3    +      -       -      +
    638B  ALA      5.2     1.9    -      -       -      +
    641B  ALA*     3.8    31.4    -      -       -      +
    642B  LYS*     4.2     7.2    -      -       +      +
    645B  SER*     4.0    11.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 639 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    487A  PHE*     3.7     7.6    -      -       +      -
    490A  ASP*     4.0    25.9    -      -       +      +
    491A  ILE*     3.6    23.6    -      -       +      -
    494A  ILE*     4.5     4.0    -      -       +      -
    635A  ALA      3.2     8.9    +      -       -      +
    636A  ALA      3.1     9.0    +      -       -      +
    638A  ALA*     1.3    80.0    -      -       -      +
    640A  MET*     1.3    57.3    +      -       -      +
    642A  LYS*     3.3     9.1    +      -       -      +
    643A  PHE*     3.0    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 640 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    487A  PHE*     3.6    27.6    -      -       +      -
    491A  ILE*     5.1     0.9    -      -       +      -
    626A  TYR*     3.9    34.7    -      -       +      +
    629A  ASN*     3.6    41.3    -      -       +      +
    631A  PHE*     4.1    16.2    -      -       -      -
    636A  ALA      2.9    21.6    +      -       -      +
    637A  HIS*     3.7    10.8    -      -       +      +
    639A  ALA*     1.3    78.4    -      -       -      +
    641A  ALA*     1.3    56.9    +      -       -      +
    643A  PHE*     3.1     5.5    -      -       -      +
    644A  LYS*     3.0    34.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 641 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    637A  HIS      2.9    17.9    +      -       -      +
    638A  ALA      3.8     2.0    -      -       -      +
    639A  ALA      3.3     0.4    -      -       -      -
    640A  MET*     1.3    73.2    -      -       -      +
    642A  LYS*     1.3    66.7    +      -       -      +
    644A  LYS*     3.3    12.0    +      -       -      +
    645A  SER*     3.0    22.3    +      -       -      -
    634B  ALA      4.5     2.4    -      -       -      +
    637B  HIS*     4.1     7.5    -      -       +      +
    638B  ALA*     4.0    15.4    -      -       -      +
    641B  ALA*     3.6    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 642 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    486A  GLN*     3.4    27.6    -      -       -      +
    490A  ASP*     2.9    30.6    +      -       -      +
    638A  ALA      3.0    17.0    +      -       -      +
    639A  ALA*     3.6     5.4    -      -       -      +
    641A  ALA*     1.3    72.1    -      -       -      +
    643A  PHE*     1.3    60.7    +      -       -      +
    645A  SER*     3.2     3.5    +      -       -      -
    646A  ASN*     2.9    48.8    +      -       -      +
    638B  ALA*     4.1    15.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 643 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    483A  VAL*     3.4    36.8    -      -       +      -
    484A  ILE*     3.8    22.2    -      -       +      -
    487A  PHE*     3.4    39.9    -      +       +      +
    549A  VAL*     5.6     1.8    -      -       +      -
    623A  LEU*     4.4    10.3    -      -       +      -
    624A  GLY*     4.0    19.1    -      -       -      -
    626A  TYR*     3.8    28.3    -      +       -      -
    639A  ALA      3.0    14.4    +      -       -      +
    640A  MET      3.1    10.1    -      -       -      +
    642A  LYS*     1.3    77.3    -      -       -      +
    644A  LYS*     1.3    63.2    +      -       -      +
    646A  ASN*     3.1     9.9    +      -       -      +
    647A  LEU*     3.0    44.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 644 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    624A  GLY*     3.5    35.9    +      -       -      +
    625A  ASP*     4.9    11.3    +      -       -      +
    626A  TYR      5.6     0.4    -      -       -      +
    640A  MET*     3.0    21.2    +      -       +      +
    641A  ALA*     3.3    12.5    +      -       -      +
    643A  PHE*     1.3    75.2    -      -       +      +
    645A  SER*     1.3    57.0    +      -       -      +
    647A  LEU*     3.4    10.4    +      -       -      +
    648A  ALA*     3.0    27.7    +      -       -      +
    634B  ALA*     4.2     7.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 645 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    641A  ALA      3.0    13.6    +      -       -      -
    642A  LYS*     3.5     9.0    -      -       -      -
    643A  PHE      3.1     0.2    -      -       -      -
    644A  LYS*     1.3    74.4    -      -       -      +
    646A  ASN*     1.3    68.6    +      -       -      +
    648A  ALA*     3.4     3.3    +      -       -      +
    649A  ASN*     3.2    31.6    +      -       -      +
    634B  ALA*     3.6    22.6    -      -       -      +
    635B  ALA*     3.4    24.3    +      -       -      +
    638B  ALA*     4.0    10.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 646 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    483A  VAL*     3.7    30.2    +      -       +      +
    486A  GLN*     4.8    10.9    -      -       -      +
    642A  LYS*     2.9    43.6    +      -       -      +
    643A  PHE*     3.5     9.3    -      -       -      +
    645A  SER*     1.3    76.1    +      -       -      +
    647A  LEU*     1.3    64.5    +      -       -      +
    649A  ASN*     3.3    15.0    +      -       -      +
    650A  ILE*     3.2    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 647 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    480A  LEU*     4.0    15.9    -      -       +      -
    483A  VAL*     3.7    23.1    -      -       +      -
    484A  ILE*     5.7     0.2    -      -       +      -
    623A  LEU*     3.4    57.2    -      -       +      +
    624A  GLY*     3.9     9.6    -      -       -      -
    643A  PHE*     3.0    29.4    +      -       +      +
    644A  LYS*     3.6     9.9    -      -       -      +
    645A  SER      3.3     0.2    -      -       -      -
    646A  ASN*     1.3    74.7    -      -       -      +
    648A  ALA*     1.3    60.1    +      -       -      +
    649A  ASN      3.1     0.2    -      -       -      -
    650A  ILE*     3.0     7.6    +      -       +      +
    651A  THR*     2.9    32.8    +      -       -      -
    670A  PRO*     3.6    13.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 648 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    644A  LYS      3.0    17.4    +      -       -      +
    645A  SER      3.6     6.5    -      -       -      +
    647A  LEU*     1.3    76.9    -      -       -      +
    649A  ASN*     1.3    63.7    +      -       -      +
    651A  THR*     3.5     9.5    -      -       -      -
    652A  LYS*     3.2    21.0    +      -       -      +
    634B  ALA*     3.8    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 649 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645A  SER*     3.2    24.4    +      -       -      +
    646A  ASN*     3.6    16.3    +      -       -      +
    647A  LEU      3.1     0.8    -      -       -      -
    648A  ALA*     1.3    79.3    -      -       -      +
    650A  ILE*     1.3    63.9    +      -       +      +
    652A  LYS*     3.3    11.4    +      -       -      +
    653A  GLN*     3.1    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 650 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476A  ASP      5.2     0.4    -      -       -      +
    479A  LEU*     3.6    43.5    -      -       +      +
    480A  LEU*     4.0    18.6    -      -       +      +
    483A  VAL*     3.6    33.9    -      -       +      -
    646A  ASN      3.2    10.6    +      -       -      +
    647A  LEU*     3.0    10.8    +      -       +      +
    649A  ASN*     1.3    75.0    -      -       +      +
    651A  THR*     1.3    65.4    +      -       -      +
    653A  GLN*     3.1    12.3    +      -       -      +
    654A  ILE*     2.9    43.5    +      -       +      +
    670A  PRO*     4.2    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 651 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647A  LEU      2.9    13.3    +      -       -      -
    648A  ALA*     3.5    13.4    -      -       -      +
    650A  ILE*     1.3    77.4    -      -       -      +
    652A  LYS*     1.3    57.3    +      -       -      +
    654A  ILE*     3.8     4.6    -      -       -      +
    655A  THR*     2.9    41.2    +      -       -      +
    669A  ILE*     4.3    16.4    -      -       +      +
    670A  PRO*     3.2    29.5    -      -       -      +
    671A  GLY      4.6     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 652 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    648A  ALA      3.2    11.2    +      -       -      +
    649A  ASN*     3.5    14.6    -      -       -      +
    650A  ILE      3.1     0.4    -      -       -      -
    651A  THR*     1.3    79.3    -      -       -      +
    653A  GLN*     1.3    63.9    +      -       +      +
    655A  THR*     3.5     5.7    +      -       -      -
    656A  GLU*     3.1    56.3    +      -       +      +
    118B  LYS*     6.1     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 653 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    479A  LEU*     3.6    36.0    -      -       +      +
    649A  ASN*     3.1    22.9    +      -       -      +
    650A  ILE*     3.1    14.3    +      -       -      +
    652A  LYS*     1.3    74.2    -      -       +      +
    654A  ILE*     1.3    65.7    +      -       -      +
    656A  GLU*     3.1    13.5    +      -       -      +
    657A  ARG*     3.0    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 654 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476A  ASP*     3.4    31.0    -      -       +      +
    479A  LEU*     5.3     1.8    -      -       +      -
    650A  ILE*     2.9    35.6    +      -       +      +
    651A  THR      3.8     3.8    -      -       -      +
    653A  GLN*     1.3    76.9    -      -       +      +
    655A  THR*     1.3    57.0    +      -       -      +
    657A  ARG*     3.4    19.3    +      -       -      +
    658A  ASN*     2.9    44.8    +      -       -      +
    665A  TYR      4.0     2.9    -      -       -      +
    668A  LEU      3.6    28.3    -      -       -      +
    669A  ILE*     3.6    27.1    -      -       +      -
    670A  PRO*     4.4     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 655 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    651A  THR*     2.9    28.7    +      -       -      +
    652A  LYS*     3.7     7.6    -      -       -      -
    654A  ILE*     1.3    78.0    -      -       -      +
    656A  GLU*     1.3    64.5    +      -       +      +
    658A  ASN*     3.3     8.2    +      -       -      +
    659A  GLN*     3.2    31.3    +      -       -      +
    669A  ILE*     5.2     7.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 656 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    652A  LYS*     3.1    53.0    +      -       +      +
    653A  GLN*     3.1    11.7    +      -       -      +
    655A  THR*     1.3    79.0    -      -       +      +
    657A  ARG*     1.3    63.9    +      -       -      +
    659A  GLN*     3.2    21.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 657 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472A  TYR*     3.6    43.1    +      -       +      +
    475A  ASP*     4.4    10.1    -      -       -      +
    476A  ASP*     2.9    42.2    +      -       -      -
    653A  GLN      3.0    15.0    +      -       -      +
    654A  ILE*     3.7    13.4    -      -       -      +
    656A  GLU*     1.3    72.5    -      -       -      +
    658A  ASN*     1.3    81.4    +      -       -      +
    659A  GLN      3.0    13.4    +      -       -      +
    661A  MET*     3.4    21.4    -      -       +      +
    665A  TYR*     3.1    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 658 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    654A  ILE*     2.9    26.8    +      -       -      +
    655A  THR*     3.3     8.2    +      -       -      +
    657A  ARG*     1.3   103.2    +      -       -      +
    659A  GLN*     1.3    63.5    +      -       -      +
    660A  GLY      3.2     3.1    +      -       -      -
    661A  MET*     3.2    25.2    +      -       -      +
    664A  PRO*     3.5    27.3    -      -       +      +
    665A  TYR      2.9    27.8    +      -       -      +
    666A  THR*     3.7     8.7    -      -       -      +
    669A  ILE*     4.7     2.8    -      -       -      +
----------------------------------------------------------
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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