Contacts of the helix formed by residues 207 - 239 (chain A) in PDB entry 1M5I


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 CYS 207 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  TYR*     5.5     4.3    -      -       -      -
    206A  THR*     1.3    77.3    -      -       -      +
    208A  GLN*     1.3    79.1    +      -       -      +
    210A  MET*     3.9    18.3    -      -       +      +
    211A  GLU*     3.4    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206A  THR*     3.2    10.2    +      -       -      +
    207A  CYS*     1.3    92.6    +      -       -      +
    209A  ASP*     1.3    58.6    +      -       -      +
    211A  GLU*     2.9    41.6    +      -       -      +
    212A  LYS*     3.2    26.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205A  GLY*     3.3    11.5    -      -       -      -
    206A  THR*     2.6    49.1    +      -       -      +
    208A  GLN*     1.3    74.0    -      -       -      +
    210A  MET*     1.3    59.0    +      -       -      +
    212A  LYS*     3.8    10.3    -      -       -      +
    213A  ARG*     3.1    39.6    +      -       -      +
    216A  ARG*     4.5     3.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  GLU*     3.8    19.7    -      -       -      +
    155A  LYS*     3.4    45.1    -      -       +      +
    159A  TYR*     3.9    16.8    -      -       -      +
    200A  MET*     4.3     4.7    -      -       +      -
    204A  LEU*     3.6    36.3    -      -       +      +
    205A  GLY      5.0     1.1    -      -       -      +
    206A  THR      3.0    20.4    -      -       -      +
    207A  CYS*     3.9    17.9    -      -       +      +
    208A  GLN      3.2     0.8    -      -       -      -
    209A  ASP*     1.3    81.7    +      -       -      +
    211A  GLU*     1.3    60.9    +      -       -      +
    213A  ARG*     3.8     8.8    +      -       -      +
    214A  ALA*     3.7    17.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  CYS*     3.4    13.0    +      -       -      +
    208A  GLN*     2.9    49.3    +      -       -      +
    210A  MET*     1.3    80.0    -      -       -      +
    212A  LYS*     1.3    71.3    +      -       +      +
    213A  ARG      3.3     0.4    -      -       -      -
    214A  ALA*     3.7     7.3    +      -       -      +
    215A  GLN*     3.6    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208A  GLN*     3.2    30.3    +      -       -      +
    209A  ASP*     4.3     7.2    -      -       -      +
    211A  GLU*     1.3    86.7    +      -       +      +
    213A  ARG*     1.3    64.2    +      -       -      +
    214A  ALA      3.3     0.2    -      -       -      -
    215A  GLN*     3.3    16.9    +      -       +      +
    216A  ARG*     3.3    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  GLU*     3.2    40.1    +      -       -      +
    203A  GLN      5.7     0.2    -      -       -      -
    204A  LEU*     3.0    40.1    +      -       -      +
    205A  GLY*     4.2     2.4    -      -       -      +
    209A  ASP*     3.1    33.1    +      -       -      +
    210A  MET*     3.8    11.0    -      -       -      +
    211A  GLU      3.3     0.2    -      -       -      -
    212A  LYS*     1.3    78.4    -      -       -      +
    214A  ALA*     1.3    60.1    +      -       -      +
    216A  ARG*     2.9    28.1    +      -       -      +
    217A  ARG*     3.3    44.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  LEU*     4.0    21.5    -      -       +      -
    151A  GLU*     5.2     4.3    -      -       -      +
    152A  GLU*     5.2     8.7    -      -       -      +
    210A  MET      3.7     9.7    +      -       -      +
    211A  GLU*     3.7     9.8    +      -       -      +
    212A  LYS      3.3     0.4    -      -       -      -
    213A  ARG*     1.3    77.7    -      -       -      +
    215A  GLN*     1.3    60.7    +      -       -      +
    217A  ARG*     3.9     4.9    -      -       -      +
    218A  ILE*     3.0    40.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  GLU      3.6    13.8    +      -       -      +
    212A  LYS*     3.3    15.2    +      -       +      +
    213A  ARG      3.2     0.4    -      -       -      -
    214A  ALA*     1.3    78.6    -      -       -      +
    216A  ARG*     1.3    62.7    -      -       +      +
    218A  ILE*     3.5    22.1    +      -       -      +
    219A  ALA*     2.8    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  ASP*     4.5     3.6    +      -       -      +
    212A  LYS*     3.3    14.8    +      -       -      +
    213A  ARG*     2.9    48.6    +      -       -      +
    215A  GLN*     1.3    76.9    -      -       +      +
    217A  ARG*     1.3    60.1    +      -       -      +
    219A  ALA*     3.6     7.1    -      -       +      +
    220A  ARG*     2.8    32.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144A  LEU*     3.9    23.5    -      -       +      +
    147A  ASP*     3.2    48.4    +      -       -      +
    148A  LEU*     3.7    31.3    -      -       +      +
    151A  GLU*     3.4    36.8    +      -       -      +
    152A  GLU*     5.6     0.2    +      -       -      -
    213A  ARG*     3.3    31.6    +      -       +      +
    214A  ALA*     3.9     1.3    -      -       -      +
    215A  GLN      3.2     0.4    -      -       -      -
    216A  ARG*     1.3    79.5    -      -       -      +
    218A  ILE*     1.3    57.5    +      -       -      +
    220A  ARG*     3.3     5.0    +      -       -      +
    221A  ILE*     2.8    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  LEU*     4.1    22.9    -      -       +      -
    214A  ALA*     3.0    23.1    +      -       +      +
    215A  GLN*     3.9    23.8    -      -       -      +
    217A  ARG*     1.3    76.5    -      -       -      +
    219A  ALA*     1.3    63.4    +      -       -      +
    221A  ILE*     3.5     7.7    +      -       -      +
    222A  GLN*     3.0    46.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215A  GLN*     2.8    20.2    +      -       -      +
    216A  ARG*     3.6     8.5    -      -       +      +
    218A  ILE*     1.3    77.4    -      -       -      +
    220A  ARG*     1.3    56.5    +      -       -      +
    222A  GLN*     3.3    12.5    +      -       -      +
    223A  GLN*     2.8    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  TYR*     5.0     5.5    +      -       -      -
    137A  LEU*     4.0    11.7    -      -       -      +
    140A  GLU*     3.0    33.4    +      -       -      +
    144A  LEU*     3.3    27.1    -      -       +      -
    216A  ARG      2.8    21.7    +      -       -      +
    217A  ARG*     3.7     1.6    -      -       -      +
    219A  ALA*     1.3    70.9    -      -       -      +
    221A  ILE*     1.3    54.9    +      -       -      +
    223A  GLN*     3.1    27.5    +      -       -      +
    224A  ILE*     2.7    54.8    +      -       +      +
    227A  ASP*     4.1     6.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 221 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  ARG*     4.2    18.8    -      -       +      +
    144A  LEU*     3.5    33.7    -      -       +      -
    145A  LEU*     3.6    35.2    -      -       +      +
    148A  LEU*     3.9    15.7    -      -       +      -
    217A  ARG      2.8    25.1    +      -       -      +
    218A  ILE*     3.9     6.7    -      -       -      +
    220A  ARG*     1.3    73.2    -      -       -      +
    222A  GLN*     1.3    58.4    +      -       +      +
    224A  ILE*     3.4     6.7    +      -       -      +
    225A  GLU*     2.8    53.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 222 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218A  ILE*     3.0    41.9    +      -       +      +
    219A  ALA*     3.6     9.1    -      -       -      +
    221A  ILE*     1.3    77.9    -      -       +      +
    223A  GLN*     1.3    63.5    +      -       -      +
    225A  GLU*     3.5    18.1    +      -       -      +
    226A  LYS*     3.3    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 223 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219A  ALA      2.8    18.0    +      -       -      +
    220A  ARG*     3.6    26.2    -      -       -      +
    222A  GLN*     1.3    75.5    -      -       -      +
    224A  ILE*     1.3    64.4    +      -       -      +
    226A  LYS*     3.2    42.6    +      -       -      +
    227A  ASP*     2.9    34.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 224 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  LEU*     3.6    27.6    -      -       +      +
    140A  GLU*     3.4    39.9    -      -       +      +
    141A  ARG*     4.0    15.3    -      -       +      +
    144A  LEU*     3.9    10.3    -      -       +      -
    220A  ARG*     2.7    49.5    +      -       +      +
    221A  ILE*     3.6     4.9    -      -       -      +
    223A  GLN*     1.3    74.0    -      -       -      +
    225A  GLU*     1.3    58.2    +      -       -      +
    227A  ASP*     3.2     9.5    +      -       -      +
    228A  ILE*     3.0    42.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 225 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  ARG*     2.9    42.1    +      -       -      +
    221A  ILE*     2.8    32.8    +      -       -      +
    222A  GLN*     3.7    21.2    -      -       -      +
    223A  GLN      3.3     0.6    -      -       -      -
    224A  ILE*     1.3    78.8    -      -       -      +
    226A  LYS*     1.3    60.4    +      -       -      +
    228A  ILE*     3.8     7.6    +      -       -      +
    229A  LEU*     3.5    28.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 226 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222A  GLN*     3.3    24.6    +      -       -      +
    223A  GLN*     3.2    47.8    +      -       -      +
    225A  GLU*     1.3    76.8    -      -       -      +
    227A  ASP*     1.3    66.7    +      -       -      +
    229A  LEU*     3.5     9.6    +      -       +      +
    230A  ARG*     3.2    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 227 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  TYR*     5.6     2.0    +      -       +      -
    137A  LEU*     4.1    20.5    -      -       +      +
    220A  ARG*     4.1     8.7    +      -       -      -
    223A  GLN*     2.9    39.3    +      -       -      +
    224A  ILE*     3.2    13.6    +      -       -      +
    226A  LYS*     1.3    78.4    -      -       -      +
    228A  ILE*     1.3    62.0    +      -       -      +
    230A  ARG*     3.2     7.5    +      -       -      +
    231A  ILE*     2.9    31.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 228 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  LEU*     3.8    15.0    -      -       +      +
    137A  LEU*     3.9    19.7    -      -       +      +
    138A  GLU*     3.7    27.4    -      -       +      +
    141A  ARG*     4.6    11.2    -      -       -      -
    224A  ILE*     3.0    36.1    +      -       +      +
    225A  GLU*     3.9     8.1    -      -       -      +
    226A  LYS      3.3     0.2    -      -       -      -
    227A  ASP*     1.3    76.7    -      -       -      +
    229A  LEU*     1.3    64.9    +      -       +      +
    231A  ILE*     3.2     3.6    +      -       -      +
    232A  ARG*     3.0    62.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 229 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225A  GLU*     3.5    16.1    +      -       +      +
    226A  LYS*     3.5    12.5    +      -       +      +
    227A  ASP      3.3     0.2    -      -       -      -
    228A  ILE*     1.3    80.3    -      -       +      +
    230A  ARG*     1.3    59.5    +      -       +      +
    232A  ARG*     3.3    22.2    +      -       +      +
    233A  GLN*     2.9    47.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 230 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    226A  LYS*     3.2    17.0    +      -       +      +
    227A  ASP*     3.2     9.3    +      -       -      +
    229A  LEU*     1.3    77.2    -      -       -      +
    231A  ILE*     1.3    58.2    +      -       +      +
    233A  GLN*     3.3    29.1    +      -       -      +
    234A  LEU*     2.8    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 231 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  TYR*     3.9    22.4    -      -       +      -
    134A  LEU*     3.9    22.0    -      -       +      +
    137A  LEU*     3.5    32.1    -      -       +      -
    227A  ASP*     2.9    22.6    +      -       +      +
    228A  ILE      3.2     4.2    +      -       -      +
    230A  ARG*     1.3    75.2    -      -       +      +
    232A  ARG*     1.3    64.0    +      -       -      +
    234A  LEU*     3.5    14.7    +      -       +      +
    235A  LEU*     3.1    36.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 232 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  LEU*     4.0    18.7    -      -       +      +
    138A  GLU*     2.5    31.7    +      -       -      +
    228A  ILE*     3.0    41.0    +      -       -      +
    229A  LEU*     3.6    20.3    -      -       +      +
    231A  ILE*     1.3    74.0    -      -       -      +
    233A  GLN*     1.3    59.3    +      -       +      +
    235A  LEU*     3.4     7.2    +      -       -      +
    236A  GLN*     2.7    43.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 233 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229A  LEU*     2.9    43.0    +      -       -      +
    230A  ARG*     3.5    29.1    +      -       -      +
    232A  ARG*     1.3    78.3    -      -       +      +
    234A  LEU*     1.3    52.0    +      -       -      +
    236A  GLN*     3.1     8.5    +      -       -      +
    237A  SER*     2.7    40.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 234 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230A  ARG      2.8    17.4    +      -       -      +
    231A  ILE*     3.5    16.8    -      -       +      +
    233A  GLN*     1.3    75.4    -      -       -      +
    235A  LEU*     1.3    71.5    +      -       +      +
    237A  SER*     3.3    20.7    -      -       -      -
    238A  GLN*     3.2    31.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 235 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  THR      6.1     0.4    -      -       -      +
    134A  LEU*     4.5    18.6    -      -       +      -
    231A  ILE*     3.1    29.9    +      -       +      +
    232A  ARG*     3.8     6.3    -      -       -      +
    233A  GLN      3.3     0.2    -      -       -      -
    234A  LEU*     1.3    83.2    -      -       +      +
    236A  GLN*     1.3    66.7    +      -       -      +
    238A  GLN*     3.1    19.4    +      -       -      +
    239A  ALA*     3.3    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 236 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232A  ARG*     2.7    42.2    +      -       -      +
    233A  GLN*     3.1     9.6    +      -       -      +
    235A  LEU*     1.3    80.2    -      -       -      +
    237A  SER*     1.3    68.0    +      -       -      +
    239A  ALA*     3.1    25.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 237 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233A  GLN*     2.7    24.7    +      -       -      +
    234A  LEU*     3.3    15.9    -      -       -      -
    236A  GLN*     1.3    73.2    -      -       -      +
    238A  GLN*     1.3    66.2    +      -       -      +
    239A  ALA      4.4     1.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 238 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    234A  LEU*     3.3    29.5    +      -       +      +
    235A  LEU*     3.1    40.4    +      -       -      +
    236A  GLN      3.1     0.2    -      -       -      -
    237A  SER*     1.3    84.5    -      -       -      +
    239A  ALA*     1.3    62.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 239 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235A  LEU      3.3    14.4    +      -       -      +
    236A  GLN*     3.1    18.7    +      -       +      +
    237A  SER      4.4     1.8    -      -       -      -
    238A  GLN*     1.3    84.8    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il