Contacts of the helix formed by residues 633 - 658 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118B  LYS*     3.4    30.0    +      -       -      +
    119B  ALA*     3.0    24.3    +      -       -      +
    494B  ILE*     5.7     1.6    -      -       +      -
    495B  TYR*     2.7    34.5    +      -       +      +
    631B  PHE*     3.7     1.5    -      -       -      +
    632B  GLY*     1.3    78.7    +      -       -      +
    634B  ALA*     1.3    65.8    +      -       -      +
    635B  ALA*     4.3     9.2    -      -       +      +
    636B  ALA*     3.0    18.9    +      -       +      +
    637B  HIS*     3.3    12.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 634 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    641A  ALA      4.5     1.9    -      -       -      +
    644A  LYS*     4.2     7.6    -      -       +      +
    645A  SER*     3.6    21.8    -      -       -      +
    648A  ALA*     3.8    28.5    -      -       +      -
    632B  GLY      3.3     4.9    +      -       -      +
    633B  ASP*     1.3    71.0    -      -       -      +
    635B  ALA*     1.3    61.2    +      -       -      +
    637B  HIS*     3.4    16.7    +      -       -      +
    638B  ALA      3.1    17.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 635 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645A  SER*     3.4    16.9    +      -       -      +
    649A  ASN*     6.0     2.5    -      -       -      +
    494B  ILE*     3.4    36.4    -      -       +      +
    633B  ASP*     3.1     5.1    -      -       +      +
    634B  ALA*     1.3    76.9    -      -       -      +
    636B  ALA*     1.3    64.1    +      -       -      +
    638B  ALA*     3.3     5.2    +      -       -      +
    639B  ALA*     3.2    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 636 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491B  ILE*     4.1     9.5    -      -       +      +
    494B  ILE*     3.8    10.8    -      -       +      +
    495B  TYR*     3.9    10.1    -      -       +      +
    631B  PHE*     3.5    41.7    -      -       +      -
    633B  ASP*     3.0    12.0    +      -       -      +
    635B  ALA*     1.3    77.5    -      -       -      +
    637B  HIS*     1.3    59.2    +      -       -      +
    639B  ALA*     3.1     4.3    +      -       -      +
    640B  MET*     2.9    33.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 637 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    641A  ALA*     4.1     8.5    -      -       +      +
    629B  ASN*     3.0    23.3    +      -       -      -
    631B  PHE*     2.9    28.8    +      -       +      -
    632B  GLY*     3.7    18.4    -      -       -      -
    633B  ASP      3.3     6.7    +      -       -      -
    634B  ALA*     3.5    14.9    -      -       -      +
    635B  ALA      3.3     0.6    -      -       -      -
    636B  ALA*     1.3    77.9    -      -       -      +
    638B  ALA*     1.3    57.9    +      -       -      +
    640B  MET*     3.4    13.5    +      -       +      +
    641B  ALA*     2.9    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 638 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    638A  ALA      5.2     2.3    -      -       -      +
    641A  ALA*     4.0    24.6    -      -       -      +
    642A  LYS*     4.1    11.7    -      -       +      +
    645A  SER*     4.0    11.2    -      -       -      +
    634B  ALA      3.1    12.9    +      -       -      +
    635B  ALA      3.5    10.3    -      -       -      +
    636B  ALA      3.2     0.2    -      -       -      -
    637B  HIS*     1.3    77.5    -      -       -      +
    639B  ALA*     1.3    61.0    +      -       -      +
    641B  ALA*     3.4     2.1    +      -       -      +
    642B  LYS*     3.0    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 639 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    487B  PHE*     3.7     8.0    -      -       +      -
    490B  ASP*     4.0    27.3    -      -       +      +
    491B  ILE*     3.6    22.7    -      -       +      -
    494B  ILE*     4.5     4.5    -      -       +      -
    635B  ALA      3.2     8.9    +      -       -      +
    636B  ALA      3.1     9.1    +      -       -      +
    638B  ALA*     1.3    79.0    -      -       -      +
    640B  MET*     1.3    57.3    +      -       -      +
    642B  LYS*     3.3     9.1    +      -       -      +
    643B  PHE*     3.0    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 640 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    487B  PHE*     3.6    28.3    -      -       +      -
    491B  ILE*     5.1     0.9    -      -       +      -
    626B  TYR*     3.9    34.3    -      -       +      +
    629B  ASN*     3.6    40.8    -      -       +      +
    631B  PHE*     4.1    15.9    -      -       -      -
    636B  ALA      2.9    23.1    +      -       -      +
    637B  HIS*     3.7    10.1    -      -       +      +
    639B  ALA*     1.3    78.2    -      -       -      +
    641B  ALA*     1.3    57.6    +      -       -      +
    643B  PHE*     3.1     6.0    -      -       -      +
    644B  LYS*     3.0    34.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 641 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634A  ALA      4.6     1.9    -      -       -      +
    637A  HIS*     4.1     5.6    -      -       +      +
    638A  ALA*     3.8    18.0    -      -       -      +
    641A  ALA*     3.6    24.9    -      -       +      -
    637B  HIS      2.9    18.3    +      -       -      +
    638B  ALA      3.7     2.0    -      -       -      +
    639B  ALA      3.3     0.2    -      -       -      -
    640B  MET*     1.3    73.2    -      -       -      +
    642B  LYS*     1.3    66.7    +      -       -      +
    644B  LYS*     3.3    12.8    +      -       -      +
    645B  SER*     3.0    22.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 642 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    638A  ALA*     4.2    12.7    -      -       +      +
    486B  GLN*     3.4    27.3    -      -       -      +
    490B  ASP*     2.9    30.6    +      -       -      +
    638B  ALA      3.0    17.1    +      -       -      +
    639B  ALA*     3.6     5.8    -      -       -      +
    641B  ALA*     1.3    72.7    -      -       -      +
    643B  PHE*     1.3    61.3    +      -       -      +
    645B  SER*     3.2     4.4    +      -       -      -
    646B  ASN*     2.9    48.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 643 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    483B  VAL*     3.4    36.6    -      -       +      -
    484B  ILE*     3.8    21.8    -      -       +      -
    487B  PHE*     3.4    39.7    -      +       +      -
    549B  VAL*     5.6     2.2    -      -       +      -
    623B  LEU*     4.4     9.9    -      -       +      -
    624B  GLY*     4.0    20.0    -      -       -      -
    626B  TYR*     3.8    27.1    -      +       -      -
    639B  ALA      3.0    13.5    +      -       -      +
    640B  MET      3.1    10.1    -      -       -      +
    642B  LYS*     1.3    77.7    -      -       -      +
    644B  LYS*     1.3    61.8    +      -       -      +
    646B  ASN*     3.1     9.6    +      -       -      +
    647B  LEU*     3.0    43.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 644 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634A  ALA*     4.3    10.5    -      -       +      +
    637A  HIS*     6.2     0.4    +      -       -      -
    624B  GLY*     3.5    36.0    +      -       -      +
    625B  ASP*     4.9    11.0    +      -       -      +
    626B  TYR      5.6     0.8    -      -       -      +
    640B  MET*     3.0    22.3    +      -       +      +
    641B  ALA*     3.7    11.7    -      -       -      +
    643B  PHE*     1.3    76.1    -      -       -      +
    645B  SER*     1.3    56.3    +      -       -      +
    647B  LEU*     3.4    10.8    +      -       -      +
    648B  ALA*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 645 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634A  ALA*     3.9    22.4    -      -       -      -
    635A  ALA*     3.5    22.5    +      -       -      +
    638A  ALA*     4.0    10.1    -      -       -      +
    641B  ALA      3.0    13.7    +      -       -      -
    642B  LYS*     3.5     9.2    -      -       -      -
    643B  PHE      3.1     0.2    -      -       -      -
    644B  LYS*     1.3    74.0    -      -       -      +
    646B  ASN*     1.3    67.0    +      -       -      +
    648B  ALA*     3.4     2.9    +      -       -      +
    649B  ASN*     3.2    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 646 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    483B  VAL*     3.7    30.7    +      -       +      +
    486B  GLN*     4.8     9.9    -      -       -      +
    642B  LYS*     2.9    42.9    +      -       -      +
    643B  PHE*     3.1     9.3    +      -       -      +
    645B  SER*     1.3    75.4    +      -       -      +
    647B  LEU*     1.3    64.5    +      -       -      +
    649B  ASN*     3.3    15.2    +      -       -      +
    650B  ILE*     3.2    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 647 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    480B  LEU*     4.0    15.0    -      -       +      -
    483B  VAL*     3.7    23.8    -      -       +      -
    484B  ILE*     5.7     0.2    -      -       +      -
    623B  LEU*     3.4    57.0    -      -       +      +
    624B  GLY*     3.9     9.9    -      -       -      -
    643B  PHE*     3.0    28.3    +      -       +      +
    644B  LYS*     3.7    10.8    -      -       -      +
    646B  ASN*     1.3    75.1    -      -       -      +
    648B  ALA*     1.3    59.2    +      -       -      +
    649B  ASN      3.1     0.2    -      -       -      -
    650B  ILE*     3.0     8.5    +      -       +      +
    651B  THR*     2.9    32.8    +      -       -      -
    670B  PRO*     3.6    12.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 648 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    634A  ALA*     4.0    20.0    -      -       +      -
    644B  LYS      3.0    18.3    +      -       -      +
    645B  SER      3.6     7.0    -      -       -      +
    646B  ASN      3.3     0.4    -      -       -      -
    647B  LEU*     1.3    76.0    -      -       -      +
    649B  ASN*     1.3    64.5    +      -       -      +
    651B  THR*     3.5     9.7    -      -       -      +
    652B  LYS*     3.2    20.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 649 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645B  SER*     3.2    24.7    +      -       -      +
    646B  ASN*     3.6    16.5    +      -       -      +
    647B  LEU      3.1     0.6    -      -       -      -
    648B  ALA*     1.3    79.6    -      -       -      +
    650B  ILE*     1.3    63.2    +      -       +      +
    652B  LYS*     3.3    12.3    +      -       -      +
    653B  GLN*     3.1    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 650 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476B  ASP      5.3     0.7    -      -       -      +
    479B  LEU*     3.6    45.5    -      -       +      +
    480B  LEU*     3.9    18.2    -      -       +      +
    483B  VAL*     3.5    33.7    -      -       +      -
    646B  ASN      3.2    11.0    +      -       -      +
    647B  LEU*     3.0    10.6    +      -       +      +
    649B  ASN*     1.3    75.0    -      -       +      +
    651B  THR*     1.3    66.8    +      -       -      +
    653B  GLN*     3.1    13.4    +      -       -      +
    654B  ILE*     3.0    41.9    +      -       +      +
    670B  PRO*     4.2     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 651 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647B  LEU      2.9    13.3    +      -       -      -
    648B  ALA*     3.5    13.0    -      -       -      +
    650B  ILE*     1.3    77.1    -      -       -      +
    652B  LYS*     1.3    58.4    +      -       -      +
    654B  ILE*     3.5     4.2    +      -       -      +
    655B  THR*     3.0    42.4    +      -       -      +
    669B  ILE*     4.3    16.3    -      -       +      +
    670B  PRO*     3.2    30.0    -      -       -      +
    671B  GLY      4.6     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 652 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  LYS*     6.4     0.2    -      -       -      +
    648B  ALA      3.2    11.0    +      -       -      +
    649B  ASN*     3.5    14.8    -      -       -      +
    650B  ILE      3.1     0.6    -      -       -      -
    651B  THR*     1.3    79.5    -      -       -      +
    653B  GLN*     1.3    65.7    +      -       +      +
    655B  THR*     3.5     6.1    +      -       -      -
    656B  GLU*     3.1    56.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 653 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    479B  LEU*     3.6    36.6    -      -       +      +
    649B  ASN*     3.1    23.2    +      -       -      +
    650B  ILE*     3.1    14.7    +      -       -      +
    652B  LYS*     1.3    73.9    -      -       +      +
    654B  ILE*     1.3    66.0    +      -       -      +
    656B  GLU*     3.1    14.0    +      -       -      +
    657B  ARG*     3.0    23.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 654 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    476B  ASP*     3.4    33.2    -      -       +      +
    479B  LEU*     5.3     2.0    -      -       +      -
    650B  ILE*     3.0    35.1    +      -       +      +
    651B  THR      3.8     3.6    -      -       -      +
    653B  GLN*     1.3    78.1    -      -       +      +
    655B  THR*     1.3    57.3    +      -       -      +
    657B  ARG*     3.4    18.0    +      -       -      +
    658B  ASN*     2.9    44.2    +      -       -      +
    665B  TYR      4.0     2.2    -      -       -      +
    668B  LEU      3.6    28.7    -      -       -      +
    669B  ILE*     3.6    26.7    -      -       +      -
    670B  PRO*     4.4     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 655 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    651B  THR*     3.0    28.9    +      -       -      +
    652B  LYS*     3.7     7.4    -      -       -      -
    654B  ILE*     1.3    79.3    -      -       -      +
    656B  GLU*     1.3    65.4    +      -       +      +
    658B  ASN*     3.3     8.0    +      -       -      +
    659B  GLN*     3.2    31.7    +      -       -      +
    669B  ILE*     5.2     8.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 656 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    652B  LYS*     3.1    53.5    +      -       +      +
    653B  GLN*     3.1    11.3    +      -       -      +
    655B  THR*     1.3    78.4    -      -       +      +
    657B  ARG*     1.3    61.5    +      -       -      +
    659B  GLN*     3.2    21.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 657 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472B  TYR*     3.6    43.7    +      -       +      +
    475B  ASP*     4.4    10.3    -      -       -      +
    476B  ASP*     2.9    42.2    +      -       -      -
    653B  GLN      3.0    15.2    +      -       -      +
    654B  ILE*     3.7    12.5    -      -       -      +
    656B  GLU*     1.3    72.9    -      -       -      +
    658B  ASN*     1.3    81.2    +      -       -      +
    659B  GLN      3.0    13.5    +      -       -      +
    661B  MET*     3.4    21.2    -      -       +      +
    665B  TYR*     3.1    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 658 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    654B  ILE*     2.9    26.4    +      -       -      +
    655B  THR*     3.3     8.4    +      -       -      +
    657B  ARG*     1.3   103.0    +      -       -      +
    659B  GLN*     1.3    63.5    +      -       -      +
    660B  GLY      3.2     3.3    +      -       -      -
    661B  MET*     3.2    26.2    +      -       -      +
    664B  PRO*     3.5    27.9    -      -       +      +
    665B  TYR      2.9    27.8    +      -       -      +
    666B  THR*     3.7     8.3    -      -       -      +
    669B  ILE*     4.7     2.6    -      -       -      +
----------------------------------------------------------
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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