Contacts of the helix formed by residues 182 - 208 (chain B) in PDB entry 3JRQ


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 SER 182 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  VAL*     3.7     3.8    -      -       -      -
    181B  ASN*     1.3    75.7    -      -       -      +
    183B  GLU*     1.3    62.8    +      -       -      +
    184B  GLU*     3.3    22.8    +      -       -      +
    185B  ASP*     2.9    37.6    +      -       -      -
    186B  THR*     2.9    28.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 183 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  LEU*     5.4     6.6    -      -       -      +
     56B  ARG      3.4    18.9    -      -       -      +
     57B  CYS*     3.9    13.4    -      -       +      -
     58B  SER      4.6     0.5    +      -       -      -
    177B  VAL*     4.0    20.9    -      -       +      +
    182B  SER*     1.3    73.7    -      -       -      +
    184B  GLU*     1.3    73.5    +      -       +      +
    186B  THR*     3.8     1.8    -      -       -      -
    187B  ARG*     3.0    49.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 184 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182B  SER*     3.2    15.8    +      -       -      +
    183B  GLU*     1.3    95.3    +      -       +      +
    185B  ASP*     1.3    64.4    +      -       -      +
    187B  ARG*     3.8    11.5    -      -       -      +
    188B  LEU*     2.9    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 185 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298A  ILE*     3.2    34.8    -      -       +      +
    299A  GLN*     5.3     1.6    +      -       -      +
    300A  TRP*     4.3     0.7    -      -       +      -
    180B  GLY      5.0     0.5    -      -       -      +
    181B  ASN*     3.0    31.0    +      -       +      +
    182B  SER*     2.9    39.0    +      -       -      +
    184B  GLU*     1.3    77.5    -      -       -      +
    186B  THR*     1.3    60.1    +      -       -      +
    188B  LEU*     3.1     8.1    +      -       -      +
    189B  PHE*     2.9    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 186 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300A  TRP*     3.6    22.9    -      -       +      -
     57B  CYS*     3.9    14.1    -      -       +      -
    144B  LEU*     5.0     3.8    -      -       +      -
    173B  TYR*     5.4     0.7    -      -       +      -
    175B  VAL*     3.6    30.5    -      -       +      -
    176B  ASP      4.4     2.0    -      -       -      +
    177B  VAL*     3.7     4.4    -      -       -      +
    178B  PRO*     3.3    27.2    -      -       +      +
    181B  ASN*     4.2     0.3    -      -       -      +
    182B  SER      2.9    19.2    +      -       -      -
    183B  GLU*     3.8     4.3    -      -       -      -
    184B  GLU      3.2     0.4    -      -       -      -
    185B  ASP*     1.3    80.0    -      -       -      +
    187B  ARG*     1.3    64.0    +      -       -      +
    189B  PHE*     3.3     2.8    +      -       -      +
    190B  ALA*     3.0    24.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 187 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57B  CYS*     3.8     6.5    -      -       -      -
     58B  SER      2.9    25.5    +      -       -      +
     59B  SER*     3.5    12.9    +      -       -      -
    173B  TYR*     3.4    10.5    -      -       -      +
    183B  GLU*     3.0    48.8    +      -       -      +
    184B  GLU*     3.8    10.5    -      -       -      +
    186B  THR*     1.3    79.9    -      -       -      +
    188B  LEU*     1.3    57.3    +      -       -      +
    191B  ASP*     2.7    53.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 188 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296A  LYS*     3.7    41.1    -      -       +      +
    298A  ILE*     4.0    25.4    -      -       +      -
    306A  PHE*     4.1    29.8    -      -       +      +
    184B  GLU      2.9    14.9    +      -       -      +
    185B  ASP*     3.1     9.2    +      -       -      +
    187B  ARG*     1.3    78.4    -      -       -      +
    189B  PHE*     1.4    60.5    +      -       -      +
    191B  ASP*     4.3     2.6    -      -       +      +
    192B  THR*     2.8    34.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 189 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298A  ILE*     4.2     9.6    -      -       +      +
    300A  TRP*     3.6    29.2    -      +       +      -
    306A  PHE      3.7    10.5    +      -       -      -
    307A  GLY*     3.5    36.3    -      -       -      -
    308A  VAL*     4.2    11.0    -      -       +      -
      1B  A8S      3.1    42.4    -      -       +      -
    114B  LEU*     5.9     1.3    -      -       +      -
    115B  PRO*     3.7    12.8    -      -       +      -
    144B  LEU*     3.9    24.9    -      -       +      -
    185B  ASP      2.9    18.6    +      -       -      +
    186B  THR      3.3     3.6    +      -       -      +
    188B  LEU*     1.4    75.9    -      -       -      +
    190B  ALA*     1.3    67.3    +      -       -      +
    192B  THR*     3.5     3.3    -      -       -      -
    193B  VAL*     3.2    31.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 190 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  A8S      4.1    22.2    -      -       +      -
    144B  LEU*     5.3     5.4    -      -       +      -
    147B  TYR*     4.8     3.1    -      -       +      -
    173B  TYR*     3.5    35.2    -      -       +      +
    175B  VAL*     5.7     0.4    -      -       +      -
    186B  THR*     3.0    14.2    +      -       +      +
    189B  PHE*     1.3    81.7    -      -       +      +
    191B  ASP*     1.3    63.6    +      -       -      +
    193B  VAL*     3.2     2.3    +      -       -      +
    194B  ILE*     3.1    28.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 191 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  SER*     3.2    20.2    +      -       -      -
     60B  LEU      5.6     0.2    -      -       -      +
     61B  LEU*     3.4    23.6    -      -       +      +
    173B  TYR*     2.7    29.3    +      -       -      -
    187B  ARG*     2.7    42.2    +      -       -      +
    188B  LEU*     4.3     3.6    -      -       +      +
    190B  ALA*     1.3    74.1    -      -       -      +
    192B  THR*     1.3    56.0    +      -       -      +
    194B  ILE      4.6     0.2    -      -       -      +
    195B  ARG*     2.9    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 192 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306A  PHE*     3.6    43.5    -      -       +      +
    308A  VAL*     4.3    11.7    -      -       +      -
    320A  LEU*     4.6     7.4    -      -       +      -
    188B  LEU*     2.8    25.0    +      -       -      +
    189B  PHE      3.5     4.7    -      -       -      -
    191B  ASP*     1.3    77.0    -      -       -      +
    193B  VAL*     1.3    61.9    +      -       -      +
    195B  ARG*     4.0     4.5    -      -       -      +
    196B  LEU*     3.2    36.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 193 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308A  VAL*     4.7     9.6    -      -       +      -
      1B  A8S      3.6    43.5    -      -       +      -
     88B  PHE*     4.0    26.9    -      -       +      -
    114B  LEU*     6.0     1.3    -      -       +      -
    189B  PHE*     3.2    34.5    +      -       +      +
    190B  ALA      3.2     6.0    +      -       -      +
    192B  THR*     1.3    73.8    -      -       -      +
    194B  ILE*     1.3    66.8    +      -       -      +
    195B  ARG      3.2     0.5    +      -       -      -
    196B  LEU*     3.2     8.9    +      -       -      +
    197B  ASN*     3.0    29.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 194 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  A8S      3.4    22.9    -      -       +      -
     61B  LEU*     4.0    15.0    -      -       +      -
    147B  TYR*     3.2    22.9    -      -       -      +
    171B  GLU*     3.6    31.2    -      -       +      +
    173B  TYR*     3.4    28.5    -      -       +      -
    190B  ALA      3.1    17.3    +      -       -      +
    191B  ASP      4.3     2.0    -      -       -      +
    193B  VAL*     1.3    74.4    -      -       -      +
    195B  ARG*     1.3    57.7    +      -       -      +
    197B  ASN*     3.3     9.2    +      -       -      +
    198B  LEU*     2.9    48.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 195 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  LEU*     3.9    31.2    -      -       +      +
     62B  ALA      2.7    39.7    +      -       -      +
     63B  GLN*     3.9    11.3    +      -       -      -
    191B  ASP      2.9    21.1    +      -       -      +
    192B  THR*     4.0     5.6    -      -       -      +
    193B  VAL      3.1     0.4    -      -       -      -
    194B  ILE*     1.3    78.1    -      -       -      +
    196B  LEU*     1.3    58.6    +      -       +      +
    198B  LEU*     3.3     8.0    +      -       -      +
    199B  GLN*     2.9    60.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 196 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238A  GLU*     4.7     5.6    -      -       -      +
    319A  TYR*     3.7    53.8    -      -       +      +
    320A  LEU*     5.1     0.9    -      -       +      -
     87B  HIS*     3.4    25.1    +      -       +      -
     88B  PHE*     3.9    21.1    -      -       +      -
    192B  THR*     3.2    33.0    +      -       +      +
    193B  VAL      3.2     4.0    +      -       -      +
    195B  ARG*     1.3    78.8    -      -       +      +
    197B  ASN*     1.3    63.7    +      -       -      +
    199B  GLN*     3.4    19.1    +      -       -      +
    200B  LYS      3.0    17.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 197 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  A8S      3.8    16.8    +      -       -      +
     85B  TYR*     3.2    31.5    -      -       +      -
     86B  LYS*     3.7    27.3    -      -       -      +
     87B  HIS*     3.3    27.3    +      -       -      +
     88B  PHE*     4.4     5.2    -      -       -      -
    171B  GLU*     5.4     5.1    +      -       -      +
    193B  VAL*     3.0    31.3    +      -       -      +
    194B  ILE*     3.5    10.1    -      -       -      +
    196B  LEU*     1.3    73.4    -      -       -      +
    198B  LEU*     1.3    58.7    +      -       +      +
    200B  LYS*     3.2     1.3    +      -       -      +
    201B  LEU      2.8    23.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 198 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  LEU*     4.0    22.0    -      -       +      +
     62B  ALA      5.0     0.2    -      -       -      -
     63B  GLN*     3.6    29.5    -      -       +      +
     85B  TYR*     5.2     4.3    -      -       +      +
    151B  THR*     5.6     1.8    -      -       +      -
    169B  VAL*     3.9    26.7    -      -       +      +
    171B  GLU*     4.3    19.3    -      -       +      +
    194B  ILE*     2.9    40.8    +      -       +      +
    195B  ARG*     3.6    12.6    -      -       -      +
    196B  LEU      3.2     0.2    -      -       -      -
    197B  ASN*     1.3    76.4    -      -       -      +
    199B  GLN*     1.3    61.8    +      -       -      +
    201B  LEU*     3.5    17.7    -      -       +      +
    202B  ALA*     2.8    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 199 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238A  GLU*     5.3     3.1    -      -       -      +
     63B  GLN*     3.8    16.4    -      -       -      +
    195B  ARG*     2.9    41.9    +      -       -      +
    196B  LEU*     3.8    24.0    -      -       -      +
    198B  LEU*     1.3    77.6    -      -       -      +
    200B  LYS*     1.3    57.5    +      -       -      +
    202B  ALA*     3.6     5.1    -      -       -      +
    203B  SER*     3.1    28.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 200 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83B  GLN      4.0    15.2    +      -       -      -
     84B  ILE      3.6    16.6    +      -       -      -
     85B  TYR*     2.9    26.5    -      -       -      +
     86B  LYS      4.0     7.1    +      -       -      -
     87B  HIS*     3.5    41.9    +      -       +      +
    196B  LEU      3.0    18.6    +      -       -      +
    197B  ASN      3.6     0.9    -      -       -      +
    199B  GLN*     1.3    74.7    -      -       -      +
    201B  LEU*     1.3    64.1    +      -       -      +
    203B  SER*     3.7     5.4    -      -       -      -
    204B  ILE*     3.0    42.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 201 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  ILE*     4.0    17.3    -      -       +      -
     72B  VAL*     4.2     4.3    -      -       +      +
     75B  VAL*     3.6    26.5    -      -       +      -
     76B  VAL*     3.7    27.4    -      -       +      -
     85B  TYR*     3.8    22.8    -      -       +      +
    151B  THR*     5.9     0.2    -      -       +      -
    169B  VAL*     4.3     5.4    -      -       +      -
    197B  ASN      2.8    14.6    +      -       -      +
    198B  LEU*     3.5    27.6    -      -       +      +
    200B  LYS*     1.3    78.4    -      -       -      +
    202B  ALA*     1.3    63.7    +      -       -      +
    204B  ILE*     4.5     1.3    -      -       +      -
    205B  THR*     2.8    57.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 202 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  GLN*     4.0    17.0    -      -       -      +
     65B  ILE*     3.7    28.2    -      -       +      +
    198B  LEU      2.8    17.9    +      -       -      +
    199B  GLN*     3.6     6.3    -      -       -      +
    201B  LEU*     1.3    78.9    -      -       -      +
    203B  SER*     1.3    63.8    +      -       -      +
    205B  THR*     3.3     1.2    +      -       -      -
    206B  GLU*     3.0    37.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 203 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199B  GLN      3.1    13.9    +      -       -      -
    200B  LYS*     3.7     8.3    -      -       -      -
    202B  ALA*     1.3    79.7    -      -       -      +
    204B  ILE*     1.3    63.9    +      -       -      +
    206B  GLU*     3.7     8.9    +      -       -      +
    207B  ALA*     3.3    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 204 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  VAL*     4.8     5.6    -      -       +      -
     84B  ILE*     2.6    54.1    -      -       +      +
     85B  TYR*     3.6    12.3    -      -       +      -
    200B  LYS*     3.0    35.5    +      -       +      +
    201B  LEU*     3.9     3.8    -      -       -      +
    203B  SER*     1.3    73.0    -      -       -      +
    205B  THR*     1.3    64.6    +      -       +      +
    207B  ALA*     3.3    13.4    +      -       -      +
    208B  MET*     3.3    31.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 205 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  ILE*     3.2    24.4    -      -       -      +
     67B  ALA*     3.8    10.2    -      -       -      +
     71B  THR*     4.0     4.4    -      -       -      +
     72B  VAL*     3.8    26.7    -      -       +      +
     75B  VAL*     4.0     7.2    -      -       +      -
    201B  LEU*     2.8    52.6    +      -       +      -
    202B  ALA      3.3     0.2    +      -       -      -
    204B  ILE*     1.3    75.7    -      -       +      +
    206B  GLU*     1.3    55.0    +      -       -      +
    208B  MET*     3.2    46.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 206 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  ARG      4.4     2.8    -      -       -      +
     65B  ILE*     3.7    11.9    -      -       +      -
     66B  HIS*     2.8    60.5    +      -       +      +
     67B  ALA*     4.2     4.7    -      -       -      -
    202B  ALA*     3.0    29.4    +      -       -      +
    203B  SER*     4.3     5.9    +      -       -      +
    205B  THR*     1.3    72.2    -      -       -      +
    207B  ALA*     1.3    62.9    +      -       -      +
    208B  MET      3.3     7.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 207 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203B  SER      3.3    18.4    +      -       -      +
    204B  ILE*     3.6     8.1    -      -       -      +
    205B  THR      3.3     0.2    -      -       -      -
    206B  GLU*     1.3    72.5    -      -       -      +
    208B  MET*     1.3    66.1    +      -       +      +
    209B  ASN      3.9     5.4    -      -       -      +
    210B  ARG*     5.1     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 208 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  THR*     3.0    38.6    -      -       +      +
     74B  SER*     5.1     1.6    -      -       -      +
     75B  VAL*     3.6    20.6    -      -       +      -
     84B  ILE*     6.2     0.2    -      -       -      -
    204B  ILE*     3.3    16.4    -      -       +      +
    205B  THR*     3.2    41.4    +      -       +      +
    206B  GLU      3.5     8.5    -      -       -      +
    207B  ALA*     1.3    82.2    -      -       -      +
    209B  ASN*     1.3    69.3    +      -       -      +
    210B  ARG*     4.4    15.3    -      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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