Contacts of the helix formed by residues 140 - 166 (chain B) in PDB entry 3BRU


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 140 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72B  ALA*     5.7     2.3    -      -       -      +
     76B  LEU*     4.1    23.0    -      -       +      +
    138B  PRO*     4.1    13.0    -      -       -      +
    139B  ASP*     1.3    74.2    +      -       -      +
    141B  PHE*     1.3    74.4    +      -       +      +
    142B  ARG      3.3     0.7    +      -       -      -
    143B  ALA*     3.9     5.6    +      -       -      +
    144B  ALA*     3.7    18.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 141 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45B  TYR*     4.0    28.5    -      +       -      -
     72B  ALA*     3.4    31.4    -      -       +      -
     75B  GLY*     3.8    20.6    -      -       -      -
     76B  LEU*     3.8    16.8    -      -       +      -
     79B  ILE*     3.8    15.0    -      -       +      -
    130B  LEU*     4.2     6.5    -      -       +      -
    134B  MSE      4.2    12.6    -      -       -      -
    137B  LEU*     3.8    24.5    -      -       +      -
    138B  PRO*     2.9    40.9    +      -       +      +
    140B  ASP*     1.3    85.0    -      -       +      +
    142B  ARG*     1.3    65.4    +      -       -      +
    144B  ALA*     3.8     1.4    -      -       -      +
    145B  LEU*     2.9    28.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 142 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122A  ARG*     6.3     0.2    -      -       -      +
    194A  LYS      3.2    16.6    +      -       -      -
    195A  LEU*     2.5    47.3    +      -       +      +
    196A  GLU*     5.4     1.6    -      -       -      +
    197A  LEU*     3.5    33.2    -      -       -      +
    134B  MSE      3.4    49.1    +      -       +      +
    135B  GLY*     5.3     2.8    -      -       -      +
    139B  ASP*     3.2    20.0    +      -       -      +
    141B  PHE*     1.3    79.9    -      -       -      +
    143B  ALA*     1.3    58.7    +      -       -      +
    145B  LEU*     3.8     1.6    -      -       -      +
    146B  ILE*     3.0    42.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 143 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139B  ASP      4.5     1.5    +      -       -      +
    140B  ASP      3.9     6.5    +      -       -      +
    141B  PHE      3.4     0.4    -      -       -      -
    142B  ARG*     1.3    78.9    -      -       -      +
    144B  ALA*     1.3    57.7    +      -       -      +
    146B  ILE*     3.9     8.3    -      -       -      +
    147B  GLY*     2.9    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 144 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76B  LEU*     4.0    20.6    -      -       +      -
     79B  ILE*     4.2    15.0    -      -       +      +
    140B  ASP      3.7    12.9    +      -       -      +
    141B  PHE      3.3     6.0    +      -       -      +
    142B  ARG      3.3     0.8    -      -       -      -
    143B  ALA*     1.3    77.7    -      -       -      +
    145B  LEU*     1.3    62.6    +      -       -      +
    147B  GLY*     3.6     1.7    +      -       -      -
    148B  VAL*     3.2    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 145 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  LEU*     4.2    18.4    -      -       +      -
     79B  ILE*     3.8    26.2    -      -       +      -
    127B  VAL*     4.1    26.4    -      -       +      +
    130B  LEU*     3.8    28.3    -      -       +      +
    131B  GLY*     3.7    26.7    -      -       -      +
    134B  MSE      4.3     3.4    -      -       -      -
    137B  LEU*     4.2    11.0    -      -       +      -
    141B  PHE*     2.9    25.1    +      -       +      +
    142B  ARG      3.8     2.7    -      -       -      +
    144B  ALA*     1.3    74.8    -      -       -      +
    146B  ILE*     1.3    64.7    +      -       -      +
    148B  VAL*     3.3     7.4    +      -       -      +
    149B  LEU*     3.1    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 146 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  ARG*     6.0     0.9    -      -       -      +
    195A  LEU*     4.0    20.9    -      -       +      +
    196A  GLU*     3.8    34.1    -      -       +      +
    142B  ARG*     3.0    35.4    +      -       +      +
    143B  ALA*     4.1     7.0    -      -       -      +
    145B  LEU*     1.3    77.2    -      -       -      +
    147B  GLY*     1.3    56.1    +      -       -      +
    149B  LEU*     3.4     8.3    +      -       +      +
    150B  GLU*     3.0    54.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 147 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143B  ALA      2.9    18.6    +      -       -      -
    144B  ALA      3.6     2.7    +      -       -      -
    145B  LEU      3.3     0.4    -      -       -      -
    146B  ILE*     1.3    77.0    -      -       -      +
    148B  VAL*     1.3    56.2    +      -       -      +
    150B  GLU*     3.9     9.7    -      -       -      +
    151B  THR*     2.9    32.9    +      -       -      -
    154B  ARG*     4.5     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 148 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  ILE*     4.2    15.9    -      -       +      +
     83B  ASP*     4.0    33.0    -      -       +      +
    127B  VAL*     3.8    17.5    -      -       +      -
    144B  ALA      3.2    15.0    -      -       -      +
    145B  LEU*     3.3     7.6    +      -       -      +
    146B  ILE      3.2     0.4    -      -       -      -
    147B  GLY*     1.3    75.2    -      -       -      +
    149B  LEU*     1.3    65.2    +      -       -      +
    151B  THR*     3.3     6.9    +      -       -      -
    152B  TRP*     3.2    57.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 149 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191A  LEU*     5.8     2.2    -      -       +      -
    192A  ARG*     3.8    47.6    -      -       -      +
    195A  LEU*     3.8    19.1    -      -       +      -
    127B  VAL*     3.7    21.8    -      -       +      +
    131B  GLY*     6.3     0.2    -      -       -      -
    145B  LEU      3.1    16.7    +      -       -      +
    146B  ILE*     3.4     8.7    +      -       +      +
    148B  VAL*     1.3    77.5    -      -       -      +
    150B  GLU*     1.3    56.2    +      -       +      +
    152B  TRP*     3.4    28.9    +      -       +      +
    153B  GLN*     3.1    32.3    +      -       -      +
    183B  TRP*     5.0     5.9    -      -       +      -
    187B  GLU*     4.3    17.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 150 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  ARG*     5.5     3.4    -      -       -      +
    196A  GLU*     5.6     1.2    -      -       -      +
    198A  ARG*     5.1     8.8    +      -       -      -
    146B  ILE*     3.0    39.9    +      -       +      +
    147B  GLY*     3.9     7.2    -      -       -      +
    149B  LEU*     1.3    73.6    -      -       +      +
    151B  THR*     1.3    66.1    +      -       -      +
    153B  GLN*     3.2    19.0    +      -       -      +
    154B  ARG*     2.9    48.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 151 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83B  ASP*     5.0     8.8    +      -       -      +
    147B  GLY      2.9    17.9    +      -       -      -
    148B  VAL*     3.3    10.2    +      -       -      -
    150B  GLU*     1.3    76.4    -      -       -      +
    152B  TRP*     1.3    66.8    +      -       +      +
    154B  ARG*     3.3    25.2    +      -       -      +
    155B  ARG*     3.3    34.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 152 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  TYR*     3.9    18.2    -      +       -      -
     83B  ASP*     4.1    10.1    +      -       -      -
     86B  PHE*     3.4    38.3    -      +       +      +
     87B  ALA*     5.2     3.6    -      -       -      +
     90B  LEU*     3.6    20.1    -      -       +      +
     94B  PHE*     5.1     0.3    -      -       -      -
    125B  CYS*     3.9     5.2    -      -       -      -
    127B  VAL*     3.8    19.7    -      -       +      -
    148B  VAL*     3.2    31.9    +      -       +      +
    149B  LEU*     3.6    25.4    -      -       +      +
    150B  GLU      3.3     0.2    -      -       -      -
    151B  THR*     1.3    80.5    -      -       +      +
    153B  GLN*     1.3    55.1    +      -       -      +
    155B  ARG*     3.4     7.9    +      -       -      +
    156B  THR*     2.7    36.9    +      -       -      -
    183B  TRP*     3.4    42.1    -      +       +      -
    187B  GLU*     3.6    21.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 153 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  ARG*     2.8    42.5    +      -       -      +
    149B  LEU      3.1    21.3    +      -       -      +
    150B  GLU*     3.2    18.0    +      -       -      +
    152B  TRP*     1.3    74.0    -      -       -      +
    154B  ARG*     1.3    60.1    +      -       +      +
    156B  THR*     3.2     0.9    +      -       -      -
    157B  ALA*     2.8    31.6    +      -       -      +
    176B  ASP      5.7     0.4    -      -       -      +
    179B  ALA*     3.5    17.4    -      -       +      +
    180B  GLU*     3.8    28.1    +      -       -      +
    183B  TRP*     3.8    24.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 154 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147B  GLY      4.5     1.8    +      -       -      -
    150B  GLU*     2.9    39.8    +      -       -      +
    151B  THR*     3.3    36.7    +      -       -      +
    153B  GLN*     1.3    75.3    -      -       +      +
    155B  ARG*     1.3    58.5    +      -       +      +
    157B  ALA*     3.5     6.9    +      -       -      +
    158B  GLN*     3.1    27.7    +      -       -      +
    161B  ARG*     4.9     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 155 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87B  ALA*     3.2    33.7    +      -       -      +
     90B  LEU*     3.5    29.6    +      -       +      +
     91B  ASP*     2.7    37.2    +      -       -      +
     94B  PHE*     3.9    21.9    -      -       +      +
     95B  LEU*     4.2    15.0    -      -       -      +
    151B  THR*     3.3    25.7    +      -       +      +
    152B  TRP*     3.6     8.7    -      -       -      +
    153B  GLN      3.2     0.6    -      -       -      -
    154B  ARG*     1.3    75.8    -      -       +      +
    156B  THR*     1.3    59.0    +      -       -      +
    158B  GLN*     3.4    17.2    +      -       -      +
    159B  LEU*     3.1    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 156 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94B  PHE*     3.7    19.0    -      -       +      -
    105B  LEU*     4.5     9.2    -      -       +      -
    152B  TRP      2.7    18.1    +      -       -      -
    153B  GLN      3.2     3.3    +      -       -      -
    155B  ARG*     1.3    73.2    -      -       -      +
    157B  ALA*     1.3    60.8    +      -       -      +
    159B  LEU*     3.2     5.7    +      -       +      +
    160B  PHE*     2.9    59.5    +      -       +      -
    179B  ALA*     3.9     9.6    -      -       +      -
    182B  PHE*     4.4    10.3    -      -       +      -
    183B  TRP*     2.8    22.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 157 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153B  GLN      2.8    17.6    +      -       -      +
    154B  ARG*     3.6     8.7    -      -       -      +
    155B  ARG      3.4     0.2    -      -       -      -
    156B  THR*     1.3    75.1    -      -       -      +
    158B  GLN*     1.3    56.3    +      -       -      +
    160B  PHE*     3.0     3.7    +      -       -      +
    161B  ARG*     2.9    36.5    +      -       -      +
    175B  PRO*     3.8    19.5    -      -       -      +
    176B  ASP*     3.6    24.7    -      -       -      +
    179B  ALA*     3.5     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 158 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  LEU*     5.9     5.0    -      -       -      +
    154B  ARG      3.1    16.2    +      -       -      +
    155B  ARG*     3.7    18.3    +      -       -      +
    156B  THR      3.2     0.2    -      -       -      -
    157B  ALA*     1.3    75.6    -      -       -      +
    159B  LEU*     1.3    62.1    +      -       -      +
    160B  PHE      3.3     0.3    +      -       -      -
    161B  ARG*     3.3    18.9    +      -       +      +
    162B  GLU*     3.2    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 159 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94B  PHE*     3.7    44.4    -      -       +      +
    101B  PRO*     3.6    33.0    -      -       +      +
    104B  ARG*     3.7    37.0    -      -       +      +
    105B  LEU*     4.0    20.2    -      -       +      +
    155B  ARG      3.1    13.4    +      -       -      +
    156B  THR*     3.4     9.4    -      -       +      +
    158B  GLN*     1.3    76.9    -      -       -      +
    160B  PHE*     1.3    64.4    +      -       +      +
    162B  GLU*     3.3     9.4    +      -       -      +
    163B  ALA*     3.0    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 160 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  LEU*     3.8    31.4    -      -       +      -
    156B  THR*     2.9    31.8    +      -       +      -
    157B  ALA      3.0     7.4    +      -       -      +
    159B  LEU*     1.3    83.8    -      -       +      +
    161B  ARG*     1.3    59.9    +      -       -      +
    163B  ALA*     3.3     9.9    +      -       +      +
    164B  GLN*     3.1    30.0    +      -       -      +
    169B  LEU*     3.9     7.4    -      -       +      +
    175B  PRO*     3.6    31.4    -      -       +      -
    178B  LEU*     3.6    43.5    -      -       +      -
    179B  ALA*     3.6     7.9    -      -       -      -
    182B  PHE*     4.4     2.7    -      -       +      -
    209B  PHE*     4.4     7.0    -      +       -      -
    213B  PHE*     4.1    21.3    -      +       -      -
----------------------------------------------------------
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Residues in contact with ARG 161 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154B  ARG      4.9     1.0    +      -       -      -
    157B  ALA*     2.9    15.7    +      -       -      +
    158B  GLN*     3.7    36.3    -      -       +      +
    160B  PHE*     1.3    72.9    -      -       -      +
    162B  GLU*     1.3    60.8    +      -       -      +
    164B  GLN*     3.3    12.9    +      -       -      +
    165B  ALA*     3.0    26.0    +      -       -      +
    175B  PRO*     3.6    21.7    -      -       +      +
    176B  ASP*     2.6    36.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 162 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101B  PRO*     3.9    12.5    -      -       +      +
    104B  ARG*     2.5    40.2    +      -       -      -
    158B  GLN*     3.2    10.5    +      -       +      +
    159B  LEU*     3.4    13.2    -      -       -      +
    161B  ARG*     1.3    77.3    -      -       -      +
    163B  ALA*     1.3    64.4    +      -       -      +
    165B  ALA*     3.3    18.7    +      -       +      +
    166B  CYS*     3.4    16.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 163 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101B  PRO*     3.9    12.9    -      -       +      +
    102B  LEU*     5.0     3.6    -      -       +      +
    159B  LEU      3.0    13.2    +      -       -      +
    160B  PHE*     3.3    14.3    +      -       +      +
    162B  GLU*     1.3    75.4    -      -       -      +
    164B  GLN*     1.3    58.1    +      -       -      +
    166B  CYS*     3.5     1.7    +      -       -      -
    167B  GLY      3.2     2.9    +      -       -      -
    168B  GLU*     2.7    53.5    +      -       +      +
    169B  LEU*     3.9    13.5    -      -       +      -
    213B  PHE*     5.2     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 164 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160B  PHE      3.1    14.7    +      -       -      +
    161B  ARG*     3.5    12.2    -      -       -      +
    162B  GLU      3.2     0.2    -      -       -      -
    163B  ALA*     1.3    72.0    -      -       -      +
    165B  ALA*     1.3    66.8    +      -       -      +
    166B  CYS      3.1     2.0    -      -       -      -
    167B  GLY*     3.0    14.0    +      -       -      -
    169B  LEU*     3.4    28.2    -      -       +      +
    170B  SER      2.8    22.2    +      -       -      -
    171B  ALA*     3.6    13.6    +      -       -      +
    173B  HIS*     3.2    22.5    +      -       -      +
    175B  PRO*     3.3    28.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 165 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161B  ARG      3.0    13.3    +      -       -      +
    162B  GLU*     3.3    15.0    +      -       +      +
    164B  GLN*     1.3    75.1    -      -       -      +
    166B  CYS*     1.3    58.5    +      -       +      +
    167B  GLY      4.0     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 166 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100B  ALA*     5.9     0.4    -      -       -      -
    101B  PRO*     4.0    25.1    -      -       -      -
    162B  GLU*     3.4    16.8    -      -       -      -
    163B  ALA*     3.9     6.1    -      -       -      -
    164B  GLN      3.1     0.4    -      -       -      -
    165B  ALA*     1.3    78.2    -      -       -      +
    167B  GLY*     1.3    61.6    +      -       -      +
    168B  GLU*     3.3    14.7    +      -       -      +
----------------------------------------------------------
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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