Contacts of the helix formed by residues 179 - 206 (chain D) in PDB entry 3H90


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 179 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104D  HIS*     4.1    23.0    +      -       -      +
    110D  PRO*     4.6    11.7    -      -       -      +
    111D  MET      5.1     0.7    +      -       -      -
    112D  THR*     4.7    17.0    +      -       -      -
    164D  ILE*     3.7    26.5    -      -       +      +
    178D  ALA*     1.3    81.3    -      -       -      +
    180D  ALA*     1.3    54.9    +      -       -      +
    181D  LEU      3.5     0.2    -      -       -      -
    182D  PHE*     2.9    10.5    +      -       +      +
    183D  ALA*     2.6    41.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 180 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101D  GLY      3.7    10.1    -      -       -      +
    104D  HIS*     3.7    23.9    +      -       -      +
    105D  LEU*     3.7    30.3    -      -       +      -
    106D  ILE*     5.8     0.4    -      -       +      -
    178D  ALA*     3.2     9.2    -      -       +      +
    179D  ASP*     1.3    76.9    -      -       -      +
    181D  LEU*     1.3    55.7    +      -       -      +
    182D  PHE      2.9     1.0    +      -       -      -
    183D  ALA*     4.5     2.9    -      -       -      +
    184D  LEU*     2.7    40.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 181 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105D  LEU*     5.4     1.1    -      -       -      +
    177D  ARG*     6.0     5.4    -      -       +      +
    178D  ALA      4.5     5.1    +      -       -      +
    179D  ASP      3.5     0.6    -      -       -      -
    180D  ALA*     1.3    77.6    -      -       -      +
    182D  PHE*     1.3    78.1    +      -       +      +
    184D  LEU*     4.8     7.9    -      -       +      +
    185D  GLY*     3.5    19.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 182 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161D  ASN*     3.2    37.5    -      -       -      +
    163D  ALA*     4.6    19.3    -      -       +      -
    164D  ILE*     6.3     1.3    -      -       +      -
    178D  ALA      5.1     3.6    +      -       -      -
    179D  ASP*     2.9    12.2    +      -       +      +
    181D  LEU*     1.3   100.5    -      -       +      +
    183D  ALA*     1.3    63.1    +      -       -      +
    184D  LEU      3.2     2.0    -      -       -      -
    185D  GLY*     4.0     0.6    -      -       -      -
    186D  ILE*     3.2    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 183 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97D  LEU*     3.1    39.4    -      -       +      +
    100D  THR*     5.4     1.3    -      -       -      +
    101D  GLY*     4.3    10.1    -      -       -      +
    104D  HIS*     4.8     8.7    -      -       +      +
    179D  ASP*     2.6    31.4    +      -       +      +
    180D  ALA*     4.2     1.3    -      -       -      +
    182D  PHE*     1.3    71.7    -      -       -      +
    184D  LEU*     1.3    58.4    +      -       -      +
    186D  ILE*     5.0     2.5    -      -       -      -
    187D  GLY      3.5    11.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 184 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97D  LEU      4.6     0.4    -      -       -      -
     98D  PHE*     3.7    22.1    -      -       +      +
    101D  GLY*     3.8    13.9    -      -       -      +
    102D  ILE*     3.5    40.2    -      -       +      +
    105D  LEU*     4.7     8.5    -      -       +      -
    180D  ALA      2.7    18.7    +      -       -      +
    181D  LEU*     4.9     7.6    -      -       +      +
    183D  ALA*     1.3    78.0    -      -       -      +
    185D  GLY*     1.3    60.4    +      -       -      +
    186D  ILE      3.2     0.2    -      -       -      -
    187D  GLY*     3.0     3.5    +      -       -      -
    188D  ILE*     3.0    46.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 185 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181D  LEU      3.5    19.3    +      -       -      -
    182D  PHE*     3.5     1.3    +      -       -      -
    184D  LEU*     1.3    84.5    -      -       -      +
    186D  ILE*     1.3    59.9    +      -       -      +
    188D  ILE*     3.9     7.8    +      -       -      +
    189D  TYR*     3.4    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 186 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97D  LEU*     4.0    19.7    -      -       +      -
    156D  SER*     5.0     7.2    -      -       -      +
    159D  MET*     3.6    51.4    -      -       +      +
    161D  ASN*     4.4    13.2    -      -       -      +
    182D  PHE*     3.2    23.9    +      -       +      +
    183D  ALA*     5.0     2.2    -      -       -      -
    185D  GLY*     1.3    75.3    -      -       -      +
    187D  GLY*     1.3    59.4    +      -       -      +
    189D  TYR*     3.1     4.6    +      -       -      -
    190D  ILE*     2.8    52.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 187 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94D  ALA*     3.4    25.6    -      -       -      +
     97D  LEU*     4.2     6.0    -      -       -      +
     98D  PHE*     3.9    14.6    -      -       -      +
    183D  ALA      3.5    10.5    +      -       -      -
    184D  LEU      3.0     7.6    +      -       -      -
    186D  ILE*     1.3    79.0    -      -       -      +
    188D  ILE*     1.3    59.2    +      -       -      +
    190D  ILE*     5.2     0.2    -      -       -      -
    191D  LEU*     3.2    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 188 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98D  PHE*     3.6    33.2    -      -       +      -
    184D  LEU*     3.0    27.4    +      -       +      +
    185D  GLY*     4.0     7.2    -      -       -      +
    187D  GLY*     1.3    72.9    -      -       -      +
    189D  TYR*     1.3    69.6    +      -       +      +
    191D  LEU*     3.0     7.9    +      -       -      +
    192D  TYR*     2.9    27.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 189 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152D  LEU*     5.9     1.6    -      -       +      -
    155D  GLN*     5.4     4.7    +      -       +      -
    159D  MET*     4.1    26.9    -      -       +      -
    185D  GLY      3.4    14.0    +      -       -      +
    186D  ILE*     3.1     4.1    +      -       -      +
    188D  ILE*     1.3    82.2    -      -       +      +
    190D  ILE*     1.3    76.2    +      -       +      +
    192D  TYR*     3.8    13.3    +      +       -      +
    193D  SER*     3.1    50.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 190 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90D  ILE*     4.0    23.1    -      -       +      +
     93D  SER*     6.4     0.2    -      -       -      -
     94D  ALA*     3.8    17.0    -      -       +      +
    152D  LEU*     4.3    19.2    -      -       +      +
    155D  GLN*     4.7     2.7    -      -       +      -
    156D  SER*     4.2    34.5    -      -       -      +
    159D  MET*     4.3     5.6    -      -       -      -
    186D  ILE*     2.8    40.0    +      -       +      +
    187D  GLY*     5.2     0.2    -      -       -      -
    189D  TYR*     1.3    92.0    -      -       +      +
    191D  LEU*     1.3    54.1    +      -       -      +
    193D  SER*     3.1     3.1    +      -       -      -
    194D  ALA*     2.7    33.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 191 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91D  SER*     3.3    40.4    -      -       -      +
     94D  ALA*     3.4    10.9    -      -       +      +
     95D  LEU*     4.5    24.2    -      -       +      +
     98D  PHE*     5.7     8.3    -      -       +      -
    187D  GLY      3.2    20.0    +      -       -      +
    188D  ILE*     3.0     5.9    +      -       -      +
    190D  ILE*     1.3    76.7    -      -       -      +
    192D  TYR*     1.3    62.9    +      -       -      +
    194D  ALA*     3.4     3.2    +      -       -      -
    195D  LEU*     3.1    47.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 192 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188D  ILE*     2.9    20.7    +      -       +      +
    189D  TYR*     3.9    13.9    -      +       -      +
    191D  LEU*     1.3    77.5    -      -       -      +
    193D  SER*     1.3    71.0    +      -       -      +
    195D  LEU*     3.3     7.3    +      -       -      +
    196D  ARG*     3.0    55.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 193 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152D  LEU*     3.6    24.6    -      -       -      +
    189D  TYR*     3.1    42.0    +      -       -      -
    190D  ILE*     3.1     5.6    +      -       -      -
    192D  TYR*     1.3    84.9    -      -       -      +
    194D  ALA*     1.3    57.5    +      -       -      +
    195D  LEU      3.3     0.2    -      -       -      -
    196D  ARG*     4.1     5.2    -      -       -      +
    197D  MET*     3.1    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 194 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87D  SER*     2.6    32.5    +      -       -      +
     90D  ILE*     3.8    27.1    -      -       +      -
     91D  SER*     3.7    26.3    +      -       -      +
    152D  LEU*     3.6     8.5    -      -       +      +
    190D  ILE      2.7    16.3    +      -       -      +
    191D  LEU      3.8     1.6    -      -       -      +
    192D  TYR      3.2     0.4    -      -       -      -
    193D  SER*     1.3    75.5    -      -       -      +
    195D  LEU*     1.3    58.5    +      -       -      +
    197D  MET*     3.6     3.4    -      -       -      +
    198D  GLY      3.3     4.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 195 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87D  SER*     4.8     1.3    -      -       -      +
     91D  SER*     3.5    18.8    -      -       -      +
    191D  LEU*     3.1    39.2    +      -       +      +
    192D  TYR*     3.9     5.8    -      -       -      +
    194D  ALA*     1.3    77.1    -      -       -      +
    196D  ARG*     1.3    61.2    +      -       -      +
    197D  MET      3.0     1.1    -      -       -      -
    198D  GLY*     3.0     1.7    +      -       -      -
    199D  TYR*     2.9    33.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 196 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192D  TYR*     3.0    44.3    +      -       +      +
    193D  SER*     4.2     6.5    -      -       -      +
    195D  LEU*     1.3    75.9    -      -       -      +
    197D  MET*     1.3    61.4    +      -       -      +
    199D  TYR*     4.0    34.6    -      -       -      +
    200D  GLU*     3.5    39.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 197 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83D  ALA*     4.1    11.9    -      -       +      +
     87D  SER*     4.2    15.9    -      -       -      -
     90D  ILE*     6.3     0.2    -      -       +      -
    145D  GLN*     3.7    26.2    -      -       +      +
    148D  ARG*     3.9    35.4    -      -       -      +
    149D  ALA*     3.8    29.6    -      -       +      +
    152D  LEU*     4.3    13.2    -      -       +      -
    193D  SER      3.1    20.5    +      -       -      +
    194D  ALA*     3.6     8.5    -      -       -      +
    196D  ARG*     1.3    77.8    -      -       -      +
    198D  GLY*     1.3    61.7    +      -       -      +
    200D  GLU*     3.4    12.4    -      -       -      +
    201D  ALA*     3.3    17.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 198 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84D  LEU*     3.4     6.6    -      -       -      +
     87D  SER*     3.1    26.0    -      -       -      -
    194D  ALA      3.3     4.0    +      -       -      -
    195D  LEU*     3.0     5.8    +      -       -      -
    197D  MET*     1.3    77.4    -      -       -      +
    199D  TYR*     1.3    59.8    +      -       -      +
    201D  ALA*     3.2    10.9    -      -       -      +
    202D  VAL*     3.0    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 199 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195D  LEU      2.9    16.3    +      -       -      +
    196D  ARG*     4.0    33.9    -      -       -      +
    198D  GLY*     1.3    73.5    -      -       -      +
    200D  GLU*     1.3    62.1    +      -       +      +
    201D  ALA      3.0     1.1    -      -       -      -
    202D  VAL*     2.9    18.4    +      -       +      +
    203D  GLN*     2.8    71.0    +      -       +      +
    208D  ARG*     4.9     4.8    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    145D  GLN*     3.8    11.4    +      -       -      +
    148D  ARG*     2.8    39.1    +      -       -      +
    196D  ARG*     3.5    31.3    +      -       +      +
    197D  MET*     3.4    12.4    +      -       -      +
    199D  TYR*     1.3    83.3    -      -       +      +
    201D  ALA*     1.3    61.2    +      -       -      +
    203D  GLN*     3.5     8.8    +      -       -      +
    204D  SER*     3.1    26.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 201 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80D  SER*     3.6    21.5    -      -       -      +
     83D  ALA*     4.4     8.1    -      -       +      -
     84D  LEU*     3.9    19.1    -      -       +      +
    145D  GLN*     4.1    11.8    -      -       -      +
    197D  MET*     3.3     7.0    +      -       +      +
    198D  GLY*     3.2    14.8    +      -       -      +
    199D  TYR      3.0     0.6    -      -       -      -
    200D  GLU*     1.3    77.2    -      -       -      +
    202D  VAL*     1.3    64.3    +      -       -      +
    204D  SER*     3.1     5.0    +      -       -      -
    205D  LEU*     3.0    28.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 202 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  LEU*     3.9    17.5    -      -       +      -
     84D  LEU*     3.6    25.4    -      -       +      -
    198D  GLY      3.0    14.4    +      -       -      +
    199D  TYR*     2.9    28.6    +      -       +      +
    201D  ALA*     1.3    72.6    -      -       -      +
    203D  GLN*     1.3    67.0    +      -       +      +
    205D  LEU*     2.8    25.6    +      -       -      +
    206D  LEU*     2.8    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 203 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  TYR*     4.4     4.8    +      -       -      -
     71B  HIS*     2.9    28.5    +      -       -      -
    199D  TYR*     2.8    62.7    +      -       +      +
    200D  GLU*     3.6     9.6    -      -       -      +
    202D  VAL*     1.3    75.8    -      -       -      +
    204D  SER*     1.3    52.0    +      -       -      +
    206D  LEU*     2.5    32.9    -      -       -      +
    208D  ARG*     2.7    60.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 204 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77D  LYS*     3.3    21.9    -      -       -      -
     80D  SER*     3.7    18.8    -      -       -      -
    145D  GLN*     4.0    12.1    +      -       -      -
    200D  GLU      3.1    14.2    +      -       -      -
    201D  ALA      3.6     7.6    -      -       -      -
    202D  VAL      3.0     0.6    -      -       -      -
    203D  GLN*     1.3    73.9    -      -       -      +
    205D  LEU*     1.3    60.4    +      -       -      +
    206D  LEU      2.9    13.4    -      -       -      +
    207D  ASP*     4.2     2.3    -      -       -      -
    208D  ARG*     4.7     3.1    +      -       -      +
    238D  GLN*     4.7    13.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 205 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  LYS*     3.5    30.5    +      -       -      +
     81B  LEU*     3.9    18.6    -      -       +      -
    205B  LEU*     4.3    18.0    -      -       +      +
     77D  LYS*     3.7    17.8    +      -       +      +
     80D  SER*     4.1    21.8    -      -       -      +
     81D  LEU*     3.5    32.1    -      -       +      +
     84D  LEU*     3.5    31.2    -      -       +      -
    201D  ALA      3.0    17.2    +      -       -      +
    202D  VAL*     2.8     8.4    +      -       -      +
    204D  SER*     1.3    74.9    -      -       -      +
    206D  LEU*     1.3    63.8    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     62B  TYR*     4.3    23.1    -      -       +      -
     71B  HIS*     4.2    15.7    -      -       +      +
     75B  HIS*     5.3     6.7    -      -       -      +
     77B  LYS*     3.9     9.2    -      -       +      -
     78B  ALA*     3.6    30.3    -      -       +      +
     81B  LEU*     3.4    26.7    -      -       +      -
    202D  VAL*     2.8    28.2    +      -       +      +
    203D  GLN*     2.5    48.7    -      -       -      +
    204D  SER      2.9     7.1    -      -       -      +
    205D  LEU*     1.3    72.9    -      -       -      +
    207D  ASP*     1.3    55.1    +      -       -      +
    208D  ARG      2.6     7.1    +      -       -      -
----------------------------------------------------------
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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