Contacts of the helix formed by residues 186 - 208 (chain D) in PDB entry 1XVP


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 PRO 186 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184D  SER      4.9     0.4    -      -       -      +
    185D  LEU*     1.3    88.4    -      -       +      +
    187D  ILE*     1.3    66.6    +      -       -      +
    188D  GLU*     3.1    12.6    -      -       +      +
    189D  ASP*     2.9    50.8    +      -       -      +
    190D  GLN*     3.1     8.8    +      -       -      +
    276D  THR*     3.2    11.4    -      -       -      +
    277D  GLN*     3.6    21.5    -      -       +      +
    280D  GLU*     5.1     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 187 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183D  ARG*     5.3     2.7    -      -       -      +
    185D  LEU      3.3     2.3    +      -       -      +
    186D  PRO*     1.3    71.9    -      -       -      +
    188D  GLU*     1.3    57.8    +      -       -      +
    190D  GLN*     3.3    24.4    +      -       -      +
    191D  ILE*     3.2    31.4    +      -       -      +
    691H  HIS*     4.5    19.1    -      -       +      +
    694H  LEU*     4.1    34.3    -      -       +      +
    695H  GLN*     4.4    17.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 188 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186D  PRO*     4.3    14.9    -      -       +      +
    187D  ILE*     1.3    76.8    -      -       +      +
    189D  ASP*     1.3    62.1    +      -       -      +
    191D  ILE*     4.1    13.2    -      -       +      +
    192D  SER*     3.0    23.4    +      -       -      -
    274D  GLY      4.3     3.5    -      -       -      +
    276D  THR*     3.5    24.8    -      -       +      +
    691H  HIS*     5.9     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 189 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185D  LEU*     3.8    10.5    -      -       +      +
    186D  PRO*     2.9    26.1    +      -       +      +
    188D  GLU*     1.3    75.4    -      -       -      +
    190D  GLN*     1.3    69.4    +      -       -      +
    191D  ILE      3.1     1.1    -      -       -      -
    192D  SER*     3.0    14.7    +      -       -      -
    193D  LEU*     3.1    19.1    +      -       -      +
    275D  VAL*     3.5     1.7    -      -       -      +
    276D  THR*     2.5    54.8    +      -       -      +
    277D  GLN*     2.9    20.8    +      -       -      +
    281D  ILE*     3.7    12.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 190 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182D  PHE*     2.8    73.4    -      -       +      +
    183D  ARG*     3.4    33.4    +      -       -      +
    185D  LEU*     2.9    23.4    +      -       +      +
    186D  PRO      3.1     9.0    -      -       -      +
    187D  ILE*     3.3    36.8    -      -       -      +
    189D  ASP*     1.3    78.2    -      -       -      +
    191D  ILE*     1.3    61.3    +      -       -      +
    193D  LEU*     3.3     1.3    +      -       -      -
    194D  LEU*     3.2    15.5    +      -       -      +
    694H  LEU*     4.3     9.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 191 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187D  ILE*     3.2    19.0    +      -       +      +
    188D  GLU*     4.2     8.7    -      -       -      +
    190D  GLN*     1.3    77.1    -      -       -      +
    192D  SER*     1.3    52.3    +      -       -      +
    194D  LEU*     3.3     7.0    +      -       -      +
    195D  LYS*     2.8    45.5    +      -       +      +
    687H  HIS*     4.5     7.9    -      -       +      +
    690H  LEU*     3.8    33.3    -      -       +      +
    691H  HIS*     3.2    39.5    -      -       +      +
    694H  LEU*     3.3    22.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 192 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188D  GLU      3.0    16.4    +      -       -      -
    189D  ASP      3.0     8.3    +      -       -      -
    191D  ILE*     1.3    76.6    -      -       -      +
    193D  LEU*     1.3    66.5    +      -       -      +
    195D  LYS*     3.3    19.0    +      -       -      +
    196D  GLY      3.5     7.3    +      -       -      -
    272D  ARG*     3.6    13.1    -      -       -      +
    273D  PRO      4.3     6.4    +      -       -      +
    274D  GLY*     3.3    36.3    +      -       -      -
    275D  VAL*     3.7     8.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 193 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182D  PHE*     3.4    23.3    -      -       +      -
    185D  LEU*     3.8    22.2    -      -       +      -
    189D  ASP      3.1    16.3    +      -       -      +
    190D  GLN      3.5     4.0    -      -       -      +
    192D  SER*     1.3    75.4    -      -       -      +
    194D  LEU*     1.3    57.4    +      -       -      +
    196D  GLY*     3.5     1.6    +      -       -      -
    197D  ALA*     2.9    32.4    +      -       -      +
    267D  LEU*     3.5    27.0    -      -       +      +
    268D  PHE*     4.4     8.7    -      -       +      -
    269D  SER      3.5    28.0    -      -       -      +
    272D  ARG*     4.1     6.0    +      -       +      -
    275D  VAL*     3.6    17.3    -      -       +      -
    281D  ILE*     4.2    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 194 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169D  VAL*     6.2     0.2    -      -       +      -
    172D  VAL*     4.2    33.0    -      -       +      +
    173D  ILE*     4.8    15.9    -      -       +      -
    176D  THR*     4.2    15.7    -      -       +      +
    182D  PHE*     4.0    22.2    -      -       +      -
    190D  GLN      3.2    15.9    +      -       -      +
    191D  ILE*     3.6     8.1    -      -       -      +
    193D  LEU*     1.3    75.9    -      -       -      +
    195D  LYS*     1.3    58.1    +      -       -      +
    196D  GLY      3.1     5.6    -      -       -      -
    197D  ALA*     4.5     0.7    -      -       -      -
    198D  ALA*     2.9    43.4    +      -       +      +
    201D  ILE*     4.9     3.6    -      -       +      -
    267D  LEU*     4.7     2.2    -      -       +      -
    346D  ILE*     3.8     7.6    -      -       +      +
    690H  LEU*     6.0     7.6    -      -       +      -
    694H  LEU*     4.3    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 195 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191D  ILE*     2.8    34.1    +      -       +      +
    192D  SER*     3.3    12.7    +      -       -      +
    194D  LEU*     1.3    75.7    -      -       -      +
    196D  GLY*     1.3    55.9    +      -       -      +
    273D  PRO      5.3     7.4    -      -       -      -
    323D  ASN*     4.9     4.7    -      -       -      +
    345D  GLU      4.1     9.4    -      -       -      +
    346D  ILE*     3.1    39.3    +      -       +      +
    348D  SER*     2.7    36.5    +      -       -      -
    685H  GLU*     5.2     5.4    -      -       -      -
    687H  HIS*     3.4    29.6    -      -       +      -
    690H  LEU*     4.5     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 196 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192D  SER      3.5     4.0    +      -       -      -
    193D  LEU      3.5     2.8    +      -       -      -
    195D  LYS*     1.3    79.0    -      -       -      +
    197D  ALA*     1.3    58.8    +      -       -      +
    198D  ALA      3.8     0.2    -      -       -      -
    199D  VAL      5.3     0.2    -      -       -      -
    200D  GLU*     2.5    29.6    -      -       -      +
    272D  ARG*     3.4    24.5    +      -       -      -
    273D  PRO*     6.4     0.9    -      -       -      -
    323D  ASN*     3.0    16.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 197 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193D  LEU      2.9    20.3    +      -       -      +
    194D  LEU*     4.5     0.2    -      -       -      -
    196D  GLY*     1.3    78.4    -      -       -      +
    198D  ALA*     1.3    55.9    +      -       -      +
    199D  VAL      3.3     2.2    -      -       -      -
    200D  GLU*     2.9     7.2    +      -       -      +
    201D  ILE*     2.7    53.1    +      -       +      +
    266D  ALA      3.1    28.7    -      -       -      +
    267D  LEU*     3.4     7.0    -      -       +      -
    272D  ARG*     4.0     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 198 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169D  VAL*     4.3    20.0    -      -       +      -
    172D  VAL*     4.1     9.7    -      -       +      +
    194D  LEU*     2.9    28.4    +      -       +      +
    196D  GLY      3.8     0.2    -      -       -      -
    197D  ALA*     1.3    76.0    -      -       -      +
    199D  VAL*     1.3    63.2    +      -       -      +
    201D  ILE*     3.3    12.7    +      -       -      +
    202D  CYS*     3.0    29.7    +      -       -      -
    346D  ILE*     3.6    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 199 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169D  VAL*     5.5     0.7    -      -       +      -
    197D  ALA      3.3     0.6    -      -       -      -
    198D  ALA*     1.3    75.9    -      -       -      +
    200D  GLU*     1.3    67.2    +      -       -      +
    202D  CYS*     3.1    18.3    +      -       -      +
    203D  HIS*     3.1    25.9    +      -       +      -
    322D  ILE*     5.3     0.4    -      -       +      -
    323D  ASN*     3.2    27.4    -      -       -      +
    326D  TYR*     3.9    27.6    -      -       +      -
    343D  LEU*     4.2     6.3    -      -       +      -
    346D  ILE*     4.1    13.2    -      -       +      +
    347D  CYS*     4.0    14.6    -      -       -      -
   1003D  CID      3.6    28.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 200 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196D  GLY      2.5    23.3    -      -       -      +
    197D  ALA*     2.9     8.1    +      -       -      +
    199D  VAL*     1.3    77.0    -      -       -      +
    201D  ILE*     1.3    61.8    +      -       -      +
    203D  HIS*     3.1     2.8    +      -       -      -
    204D  ILE*     3.0    28.6    +      -       -      +
    266D  ALA*     4.3    12.0    -      -       +      +
    272D  ARG*     3.2    27.2    +      -       -      -
    316D  LEU*     4.1     4.3    -      -       -      +
    319D  LEU*     2.8    63.5    -      -       +      +
    320D  ARG*     4.0    11.6    +      -       -      +
    322D  ILE*     6.0     0.4    -      -       +      -
    323D  ASN*     3.4    12.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 201 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125D  MET*     4.8     6.3    -      -       +      -
    172D  VAL*     4.0    23.6    -      -       +      -
    175D  PHE*     5.4     8.3    -      -       +      -
    176D  THR*     5.7     1.6    -      -       +      -
    194D  LEU*     4.9     4.0    -      -       +      -
    197D  ALA*     2.7    57.0    +      -       +      +
    198D  ALA*     3.5    10.3    -      -       -      +
    200D  GLU*     1.3    69.6    -      -       -      +
    202D  CYS*     1.3    63.4    +      -       -      +
    204D  ILE*     3.8     7.7    -      -       -      +
    205D  VAL*     2.8    46.8    +      -       +      +
    263D  ALA*     4.2    16.4    -      -       +      +
    266D  ALA*     4.0    13.2    -      -       +      -
    267D  LEU*     4.4    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 202 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128D  MET*     6.0     0.2    -      -       -      -
    168D  MET*     3.8    25.4    -      -       -      +
    169D  VAL*     3.8    25.4    -      -       -      -
    172D  VAL*     3.4    23.3    -      -       -      -
    198D  ALA      3.0    21.5    +      -       -      -
    199D  VAL      3.1     9.6    +      -       -      +
    201D  ILE*     1.3    75.5    -      -       -      +
    203D  HIS*     1.3    57.5    +      -       -      +
    205D  VAL*     3.9     2.5    -      -       -      -
    206D  LEU*     2.8    32.8    +      -       -      +
   1003D  CID      4.0    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 203 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199D  VAL*     3.1    32.9    +      -       +      +
    200D  GLU      3.1     9.6    +      -       -      +
    202D  CYS*     1.3    75.8    -      -       +      +
    204D  ILE*     1.3    63.3    +      -       -      +
    206D  LEU*     4.1     5.6    -      -       +      +
    207D  ASN*     3.0    18.4    +      -       -      +
    238D  PHE*     5.3     1.4    -      -       -      -
    242D  LEU*     3.7    25.4    -      -       +      +
    245D  PHE*     4.6     3.1    -      +       +      -
    246D  HIS*     3.1    34.7    +      -       +      +
    249D  LEU*     4.9     0.5    -      -       -      +
    319D  LEU*     3.6    15.0    -      -       +      -
    322D  ILE*     4.2    19.0    -      -       +      +
    326D  TYR*     5.2     2.8    -      -       -      -
   1003D  CID      3.5    47.8    +      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 204 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200D  GLU      3.0    17.0    +      -       -      +
    201D  ILE*     3.8     5.2    -      -       -      +
    202D  CYS      3.4     0.2    -      -       -      -
    203D  HIS*     1.3    74.3    -      -       -      +
    205D  VAL*     1.3    60.4    +      -       +      +
    207D  ASN*     2.9    27.5    +      -       -      +
    208D  THR*     3.9     2.8    +      -       -      +
    249D  LEU*     4.7     9.6    -      -       +      -
    259D  TYR*     3.8    41.6    -      -       +      +
    262D  LEU*     4.0    14.8    -      -       +      +
    263D  ALA*     3.3    35.2    -      -       +      +
    266D  ALA*     3.8    17.0    -      -       +      -
    316D  LEU*     4.8     1.6    -      -       +      -
    319D  LEU*     3.6    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 205 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121D  HIS*     4.8     6.5    -      -       +      +
    125D  MET*     3.3    42.8    -      -       +      -
    126D  GLY*     4.2     4.0    -      -       -      +
    128D  MET*     3.8    27.4    -      -       +      -
    129D  PHE*     3.1    12.8    -      -       +      -
    201D  ILE*     2.8    29.8    +      -       +      +
    202D  CYS*     4.1     4.0    -      -       -      +
    204D  ILE*     1.3    77.9    -      -       +      +
    206D  LEU*     1.3    56.2    +      -       -      +
    207D  ASN      3.4     0.2    -      -       -      -
    208D  THR*     3.0    27.7    +      -       +      +
    259D  TYR*     6.2     0.2    -      -       -      -
    263D  ALA*     4.9     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 206 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129D  PHE*     3.2    30.5    -      -       +      -
    168D  MET*     4.3     4.5    -      -       +      -
    202D  CYS      2.8    20.1    +      -       -      +
    203D  HIS*     3.7    20.6    -      -       -      +
    204D  ILE      3.1     0.4    -      -       -      -
    205D  VAL*     1.3    75.2    -      -       -      +
    207D  ASN*     1.3    61.2    +      -       -      +
    208D  THR      3.1     2.7    -      -       -      -
    209D  THR*     3.0    25.3    +      -       -      +
    217D  PHE*     3.4    35.2    -      -       +      -
    219D  CYS*     4.6     2.7    -      -       -      -
   1003D  CID      3.5    48.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 207 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203D  HIS      3.0    11.5    +      -       -      +
    204D  ILE      2.9    13.7    +      -       -      +
    206D  LEU*     1.3    74.1    -      -       -      +
    208D  THR*     1.3    64.8    +      -       -      +
    209D  THR      3.0     4.1    +      -       -      -
    210D  PHE*     3.1    15.6    +      -       -      +
    246D  HIS*     3.0    51.5    +      -       -      +
    249D  LEU*     3.0    28.4    -      -       +      +
    250D  ARG*     3.2    20.2    +      -       -      +
    259D  TYR*     2.9    27.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with THR 208 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121D  HIS*     6.3     0.9    -      -       -      +
    126D  GLY*     5.6     3.6    -      -       -      -
    129D  PHE*     4.7     2.8    -      -       -      -
    204D  ILE      4.4     2.7    -      -       -      +
    205D  VAL*     3.0    24.4    +      -       +      +
    207D  ASN*     1.3    78.2    -      -       -      +
    209D  THR*     1.3    65.2    +      -       -      +
    250D  ARG*     3.0    32.1    +      -       -      +
    256D  GLU*     6.3     2.5    -      -       +      -
    259D  TYR*     4.3    32.3    -      -       +      -
----------------------------------------------------------
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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