Contacts of the helix formed by residues 170 - 195 (chain F) in PDB entry 4P9U


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 LEU 170 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167F  LYS*     3.7    49.6    -      -       +      +
    169F  GLU*     1.3    81.7    -      -       +      +
    171F  LYS*     1.3    65.0    +      -       +      +
    172F  ARG      3.2     0.4    -      -       -      -
    173F  GLN*     3.9     6.4    -      -       -      +
    174F  GLU*     2.9    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 171 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162F  LYS*     4.3    10.5    +      -       -      +
    163F  GLU*     5.1     1.6    -      -       -      +
    165F  SER      5.4     0.8    +      -       -      -
    167F  LYS*     3.5    15.5    +      -       +      +
    168F  ASP*     3.3    19.3    +      -       -      +
    169F  GLU      4.3     0.2    -      -       -      +
    170F  LEU*     1.3    80.6    -      -       +      +
    172F  ARG*     1.3   103.5    +      -       -      +
    173F  GLN      3.1     0.4    -      -       -      -
    174F  GLU*     2.9     9.5    +      -       +      +
    175F  ILE*     2.8    38.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 172 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158F  GLN*     3.2    21.4    +      -       -      +
    160F  HIS*     3.2    17.9    +      -       -      -
    162F  LYS*     2.7    44.3    -      -       -      +
    168F  ASP*     2.2    55.7    +      -       -      +
    169F  GLU*     3.8     9.9    -      -       +      +
    171F  LYS*     1.3   119.4    -      -       -      +
    173F  GLN*     1.3    60.4    +      -       -      +
    175F  ILE*     3.4     0.6    +      -       -      +
    176F  LEU*     2.8    40.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 173 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142F  PRO*     3.7    35.6    +      -       +      +
    143F  SER*     3.8    23.6    -      -       -      +
    169F  GLU*     2.6    37.7    +      -       -      +
    170F  LEU*     4.2     7.6    -      -       +      +
    171F  LYS      3.1     0.2    -      -       -      -
    172F  ARG*     1.3    83.8    -      -       -      +
    174F  GLU*     1.3    62.3    +      -       -      +
    176F  LEU*     3.7    22.9    -      -       +      +
    177F  ILE*     2.9    34.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 174 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142F  PRO*     5.1     7.3    -      -       -      +
    170F  LEU*     2.9    26.0    -      -       -      +
    171F  LYS*     2.9    12.2    +      -       +      +
    173F  GLN*     1.3    81.1    -      -       -      +
    175F  ILE*     1.3    62.4    +      -       +      +
    177F  ILE*     3.1    21.4    +      -       -      +
    178F  ALA*     2.9    25.6    +      -       -      +
    221F  SER*     5.0    10.0    -      -       -      +
    226F  ARG*     5.2     8.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 175 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158F  GLN*     3.0    24.5    -      -       -      +
    160F  HIS*     3.4    32.5    -      -       +      +
    171F  LYS*     2.8    26.2    +      -       +      +
    172F  ARG*     4.7     2.9    -      -       -      +
    174F  GLU*     1.3    73.3    -      -       +      +
    176F  LEU*     1.3    57.0    +      -       -      +
    178F  ALA*     3.3     6.7    +      -       -      +
    179F  LYS*     2.8    41.6    +      -       +      +
    217F  SER*     4.8     9.9    -      -       -      +
    221F  SER*     5.7     4.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 176 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156F  LYS*     5.2     5.4    -      -       +      +
    157F  ILE*     4.7     6.3    -      -       -      +
    158F  GLN*     3.2    38.4    -      -       +      +
    172F  ARG*     2.8    30.6    +      -       +      +
    173F  GLN*     3.7    27.8    -      -       +      +
    175F  ILE*     1.3    75.6    -      -       -      +
    177F  ILE*     1.3    59.1    +      -       +      +
    179F  LYS*     3.7    11.9    -      -       +      +
    180F  THR*     2.9    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 177 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137F  ALA*     4.7    21.1    -      -       +      +
    138F  LEU*     5.4     7.0    -      -       +      -
    142F  PRO*     4.6    29.2    -      -       +      +
    144F  TRP*     6.1     1.6    -      -       +      -
    173F  GLN      2.9    24.1    +      -       -      +
    174F  GLU*     3.1    24.9    +      -       -      +
    176F  LEU*     1.3    73.1    -      -       +      +
    178F  ALA*     1.3    65.5    +      -       -      +
    180F  THR*     3.1    12.1    -      -       +      +
    181F  PHE*     3.0    24.4    +      -       +      +
    226F  ARG*     3.4    39.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 178 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174F  GLU      2.9    12.3    +      -       -      +
    175F  ILE*     3.4    10.1    -      -       -      +
    176F  LEU      3.3     0.2    -      -       -      -
    177F  ILE*     1.3    77.4    -      -       -      +
    179F  LYS*     1.3    56.8    +      -       -      +
    182F  ASN*     2.9    31.6    +      -       -      +
    216F  GLY      4.1     0.2    -      -       -      +
    217F  SER*     3.2    26.7    -      -       -      +
    220F  PHE*     3.2    35.4    +      -       -      +
    221F  SER*     3.6     7.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 179 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155F  GLU      5.4     4.0    -      -       -      +
    156F  LYS*     5.8     6.3    -      -       -      -
    157F  ILE      3.1    29.4    +      -       -      +
    158F  GLN*     3.4    23.2    -      -       -      +
    160F  HIS*     6.0     0.2    -      -       -      +
    175F  ILE*     2.8    35.2    +      -       +      +
    176F  LEU*     3.7    13.7    -      -       +      +
    178F  ALA*     1.3    77.0    -      -       -      +
    180F  THR*     1.3    57.2    +      -       -      +
    182F  ASN*     3.6     5.6    +      -       -      +
    183F  PHE*     2.9    26.9    +      -       -      +
    217F  SER*     4.0    29.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 180 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137F  ALA*     4.6    11.9    -      -       +      -
    144F  TRP*     3.6    35.6    -      -       -      +
    153F  TYR*     5.5     3.3    +      -       -      -
    156F  LYS*     5.8     9.1    -      -       -      +
    176F  LEU      2.9    17.8    +      -       -      +
    177F  ILE*     3.1    22.4    -      -       +      +
    179F  LYS*     1.3    73.6    -      -       -      +
    181F  PHE*     1.3    66.0    +      -       +      +
    183F  PHE*     3.2     9.7    +      -       -      +
    184F  TYR*     3.0    35.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 181 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135F  CYS*     3.7    20.4    -      -       -      -
    137F  ALA*     6.3     0.7    -      -       +      -
    138F  LEU*     3.7    26.5    -      -       +      -
    177F  ILE*     3.0    18.6    +      -       +      +
    178F  ALA      3.9     2.5    -      -       -      +
    180F  THR*     1.3    79.0    -      -       +      +
    182F  ASN*     1.3    58.1    +      -       -      +
    184F  TYR*     3.3     6.0    +      -       -      +
    185F  ASP*     2.9    24.3    +      -       -      +
    220F  PHE*     3.4    37.9    -      +       +      -
    226F  ARG*     3.0    48.5    -      -       +      -
    229F  ALA*     3.5    12.6    -      -       +      -
    230F  MET*     3.7    14.4    -      -       +      -
    233F  TYR*     3.7    15.3    -      +       -      -
----------------------------------------------------------
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Residues in contact with ASN 182 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178F  ALA      2.9    19.0    +      -       -      +
    179F  LYS*     3.7     6.5    +      -       -      +
    181F  PHE*     1.3    74.3    -      -       -      +
    183F  PHE*     1.3    68.0    +      -       -      +
    185F  ASP*     3.2     1.2    +      -       -      +
    186F  TYR*     2.9    22.9    +      -       -      +
    212F  TYR*     3.1    20.8    -      -       -      +
    213F  ASP*     3.1    37.1    +      -       -      +
    216F  GLY*     3.1    37.2    -      -       -      -
    217F  SER*     4.0     4.3    +      -       -      +
    220F  PHE*     3.4    12.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 183 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153F  TYR*     4.7     8.5    -      +       -      -
    155F  GLU*     4.2    22.2    -      -       +      -
    156F  LYS*     3.7    38.8    -      -       +      -
    179F  LYS      2.9    15.3    +      -       -      +
    180F  THR*     3.2    12.5    +      -       -      +
    182F  ASN*     1.3    80.6    -      -       -      +
    184F  TYR*     1.3    82.5    +      +       -      +
    186F  TYR*     3.5     9.7    +      +       -      +
    187F  MET*     2.9    60.1    +      -       +      +
    209F  LYS*     5.7     6.1    -      -       -      -
    213F  ASP*     5.4     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 184 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130F  ASN*     4.6     6.5    -      -       -      -
    131F  VAL*     3.8    23.0    -      -       +      +
    134F  SER*     3.3    46.4    +      -       -      -
    135F  CYS*     3.8    25.1    -      -       -      -
    144F  TRP*     4.2     7.6    -      +       -      -
    148F  ILE*     4.4     5.7    -      -       -      +
    153F  TYR*     2.7    27.2    +      +       -      -
    180F  THR*     3.0    42.4    +      -       +      +
    181F  PHE*     3.9     1.3    -      -       -      +
    183F  PHE*     1.3    86.4    -      +       -      +
    185F  ASP*     1.3    61.5    +      -       -      +
    187F  MET*     3.5    26.8    -      -       -      +
    188F  LEU*     2.9    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 185 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105F  ARG*     3.8     3.7    +      -       -      -
    181F  PHE      2.9    16.5    +      -       -      +
    182F  ASN      3.4     5.6    -      -       -      +
    184F  TYR*     1.3    75.6    -      -       -      +
    186F  TYR*     1.3    62.4    +      -       -      +
    188F  LEU*     3.1     6.2    +      -       -      +
    189F  PHE*     3.0    32.0    +      -       -      -
    212F  TYR*     2.3    39.9    +      -       +      -
    220F  PHE*     3.4    28.7    -      -       +      -
    233F  TYR*     2.6    35.8    +      -       -      +
    255F  TYR*     4.2     6.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 186 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182F  ASN      2.9    15.9    +      -       -      +
    183F  PHE*     3.7    10.3    -      +       -      +
    185F  ASP*     1.3    73.9    +      -       -      +
    187F  MET*     1.3    71.2    +      -       +      +
    189F  PHE*     4.1     1.1    -      -       -      +
    190F  GLN*     2.9    46.5    +      -       +      +
    205F  PHE*     3.3    41.2    +      +       +      -
    206F  ASN*     3.4    23.4    +      -       -      -
    209F  LYS*     3.4    46.6    -      -       +      +
    212F  TYR*     3.8    38.6    -      +       +      -
    213F  ASP*     4.4     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 187 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127F  ILE*     5.6     1.3    -      -       +      +
    130F  ASN*     4.2    18.4    -      -       -      +
    131F  VAL*     4.4    12.6    -      -       +      -
    183F  PHE*     2.9    50.8    +      -       +      +
    184F  TYR*     3.5    19.7    -      -       +      +
    185F  ASP      3.3     0.2    -      -       -      -
    186F  TYR*     1.3    82.0    -      -       +      +
    188F  LEU*     1.3    65.0    +      -       -      +
    190F  GLN*     4.9     1.6    -      -       -      -
    191F  ARG*     2.9    77.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 188 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113F  MET*     4.4     1.6    -      -       +      -
    127F  ILE*     5.9     2.7    -      -       -      -
    128F  MET*     4.5    21.1    -      -       +      +
    131F  VAL*     3.8    30.2    -      -       +      +
    184F  TYR      2.9    13.9    +      -       -      +
    185F  ASP*     3.3     9.9    -      -       -      +
    187F  MET*     1.3    75.4    -      -       -      +
    189F  PHE*     1.3    85.5    +      -       +      +
    191F  ARG*     4.2     1.5    -      -       -      +
    192F  LEU*     2.9    51.1    +      -       +      +
    233F  TYR*     3.7    35.7    -      -       +      -
    236F  LEU*     4.4    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 189 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105F  ARG*     3.6    34.3    -      -       +      -
    109F  SER*     3.6    22.9    -      -       -      -
    112F  PHE*     3.8    10.2    -      +       -      -
    113F  MET*     3.7    19.3    -      -       +      -
    185F  ASP*     3.0    32.8    +      -       -      +
    186F  TYR      4.1     2.2    -      -       -      +
    188F  LEU*     1.3    88.9    -      -       +      +
    190F  GLN*     1.3    58.8    +      -       -      +
    192F  LEU*     4.6     2.5    -      -       -      -
    193F  ALA*     2.9    28.8    +      -       -      +
    205F  PHE*     3.6    24.2    -      +       +      -
    212F  TYR*     3.2    23.8    -      -       +      +
    232F  PHE*     3.9    25.6    -      +       -      -
    233F  TYR*     5.0     2.0    -      +       -      -
    255F  TYR*     4.7     4.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLN 190 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76E  GLU*     3.0    26.6    +      -       -      +
    186F  TYR*     2.9    47.0    +      -       +      +
    187F  MET*     4.2     1.8    -      -       -      +
    189F  PHE*     1.3    75.5    -      -       -      +
    191F  ARG*     1.3    83.5    +      -       -      +
    193F  ALA*     2.9    21.7    +      -       -      +
    194F  PHE*     3.0    26.8    +      -       +      -
    202F  GLY      4.3     5.6    -      -       -      +
    205F  PHE*     3.9    17.9    -      -       +      -
    206F  ASN*     2.8    32.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 191 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76E  GLU*     5.6     5.6    +      -       -      +
    127F  ILE*     3.6    35.2    -      -       +      +
    131F  VAL*     6.0     0.4    -      -       -      -
    187F  MET*     2.9    64.0    +      -       -      +
    188F  LEU*     4.2     0.9    -      -       -      +
    190F  GLN*     1.3    90.1    +      -       -      +
    192F  LEU*     1.3    61.5    +      -       -      +
    194F  PHE*     3.3     5.1    +      -       -      +
    195F  HIS*     2.8    38.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 192 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112F  PHE*     3.6    14.5    -      -       +      -
    113F  MET*     4.1    20.2    -      -       +      -
    116F  ALA*     3.5    27.5    -      -       +      +
    117F  PHE*     4.3    10.1    -      -       +      -
    124F  ALA*     3.7    31.0    -      -       +      -
    127F  ILE*     3.8    15.9    -      -       +      -
    128F  MET*     4.0    26.0    -      -       +      -
    188F  LEU*     2.9    42.8    +      -       +      +
    189F  PHE*     3.9     3.4    -      -       -      +
    191F  ARG*     1.3    77.1    -      -       -      +
    193F  ALA*     1.3    61.4    +      -       -      +
    194F  PHE      3.5     0.3    +      -       -      -
    195F  HIS*     3.5     5.9    +      -       +      +
    196F  SER*     3.8     1.2    +      -       -      -
    236F  LEU*     4.9     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 193 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112F  PHE*     3.5    19.1    -      -       +      -
    189F  PHE      2.9    19.0    +      -       -      +
    190F  GLN      2.9     8.4    +      -       -      +
    192F  LEU*     1.3    76.9    -      -       -      +
    194F  PHE*     1.3    54.6    +      -       -      +
    196F  SER*     2.7    21.3    +      -       -      -
    198F  ASN      3.5     4.2    -      -       -      +
    201F  TYR*     3.4    38.2    -      -       +      +
    202F  GLY*     3.7     4.2    +      -       -      +
    205F  PHE*     3.9    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 194 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75E  MET*     3.1    32.5    -      -       +      -
     76E  GLU*     4.1     8.3    -      -       -      -
    190F  GLN*     3.0    34.2    +      -       -      -
    191F  ARG*     3.3     8.5    +      -       -      +
    192F  LEU      3.2     0.4    -      -       -      -
    193F  ALA*     1.3    77.1    -      -       -      +
    195F  HIS*     1.3    62.8    +      -       +      +
    196F  SER*     3.0    10.3    +      -       -      -
    197F  GLY*     3.6    10.2    +      -       -      -
    198F  ASN      4.7     3.4    +      -       -      +
    199F  GLN*     3.7    34.3    -      -       +      -
    202F  GLY*     3.5    16.8    -      -       -      -
    203F  LEU*     3.9     9.9    -      -       +      -
    206F  ASN*     3.1    27.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 195 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116F  ALA*     3.3    23.6    -      -       +      -
    119F  LEU*     4.7     0.7    -      -       -      +
    120F  ASN*     3.5    38.3    +      -       +      +
    123F  SER*     3.3    35.4    -      -       -      -
    124F  ALA*     5.3     1.8    -      -       -      +
    127F  ILE*     4.2    21.5    -      -       +      +
    191F  ARG*     2.8    33.7    +      -       +      +
    192F  LEU*     3.5     7.7    +      -       +      +
    194F  PHE*     1.3    81.5    -      -       +      +
    196F  SER*     1.3    59.4    +      -       -      +
    197F  GLY      3.4     1.1    -      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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