Contacts of the helix formed by residues 170 - 195 (chain E) 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 E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167E  LYS*     3.2    13.8    +      -       +      +
    169E  GLU*     1.3    80.9    -      -       -      +
    171E  LYS*     1.3    64.3    +      -       -      +
    172E  ARG      3.3     1.3    -      -       -      -
    173E  GLN*     4.1     5.5    -      -       -      +
    174E  GLU*     3.1    35.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 171 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158E  GLN*     4.2     0.4    +      -       -      -
    160E  HIS*     2.9    64.2    -      -       +      +
    167E  LYS*     2.9    18.4    +      -       +      +
    168E  ASP*     3.5     4.7    +      -       -      -
    170E  LEU*     1.3    79.5    -      -       +      +
    172E  ARG*     1.3    91.5    +      -       -      +
    174E  GLU*     3.1    10.0    +      -       -      +
    175E  ILE*     3.0    44.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 172 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158E  GLN*     2.8    57.5    +      -       -      +
    160E  HIS*     4.3     7.2    -      -       +      +
    168E  ASP*     3.2    33.1    +      -       -      +
    169E  GLU*     4.5     4.3    -      -       -      +
    170E  LEU      3.3     0.4    -      -       -      -
    171E  LYS*     1.3    94.9    -      -       -      +
    173E  GLN*     1.3    61.4    +      -       +      +
    175E  ILE      3.3     1.4    +      -       -      -
    176E  LEU*     2.9    55.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 173 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142E  PRO*     3.2    45.9    -      -       +      +
    143E  SER*     4.8     7.3    -      -       -      -
    169E  GLU*     3.0    26.2    +      -       -      +
    170E  LEU*     4.2     6.0    -      -       -      +
    171E  LYS      3.2     0.4    -      -       -      -
    172E  ARG*     1.3    82.1    +      -       +      +
    174E  GLU*     1.3    63.3    +      -       -      +
    176E  LEU*     3.4    20.1    -      -       +      +
    177E  ILE*     2.9    35.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 174 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142E  PRO*     6.0     2.6    -      -       -      +
    170E  LEU*     3.1    35.1    +      -       +      +
    171E  LYS*     3.1    10.0    +      -       +      +
    173E  GLN*     1.3    80.8    -      -       -      +
    175E  ILE*     1.3    66.5    +      -       +      +
    177E  ILE*     3.1    21.4    +      -       -      +
    178E  ALA*     3.0    21.3    +      -       -      +
    221E  SER*     5.1     7.0    -      -       -      -
    226E  ARG*     5.0    10.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 175 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158E  GLN*     3.2    39.3    -      -       -      +
    160E  HIS*     5.1     0.7    -      -       -      +
    171E  LYS*     3.0    39.7    +      -       +      +
    172E  ARG      3.6     1.1    -      -       -      +
    174E  GLU*     1.3    77.4    -      -       +      +
    176E  LEU*     1.3    55.7    +      -       -      +
    178E  ALA*     3.3     6.0    +      -       -      +
    179E  LYS*     2.9    41.8    +      -       +      +
    217E  SER*     5.0     8.5    -      -       -      +
    221E  SER*     5.9     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 176 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145E  ASP*     5.3     7.9    -      -       -      +
    156E  LYS*     3.6    28.0    -      -       +      +
    157E  ILE*     5.6     0.2    -      -       -      -
    158E  GLN*     3.4    39.7    -      -       +      +
    172E  ARG*     2.9    50.4    +      -       +      +
    173E  GLN*     3.4    25.4    -      -       +      +
    174E  GLU      3.1     0.2    -      -       -      -
    175E  ILE*     1.3    76.7    -      -       -      +
    177E  ILE*     1.3    57.8    +      -       +      +
    179E  LYS*     3.3     5.8    +      -       +      +
    180E  THR*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 177 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137E  ALA*     4.6    20.2    -      -       +      +
    138E  LEU*     5.7     4.3    -      -       +      -
    140E  ASN      6.0     1.1    -      -       -      +
    142E  PRO*     5.3    17.7    -      -       +      +
    144E  TRP*     6.1     4.0    -      -       +      -
    173E  GLN*     2.9    20.5    +      -       +      +
    174E  GLU*     3.4    24.5    -      -       -      +
    176E  LEU*     1.3    76.0    -      -       +      +
    178E  ALA*     1.3    66.0    +      -       -      +
    180E  THR*     3.0    27.9    -      -       +      +
    181E  PHE*     3.0    10.0    +      -       +      +
    226E  ARG*     3.7    37.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 178 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174E  GLU      3.0    10.6    +      -       -      +
    175E  ILE*     3.3     9.6    +      -       -      +
    177E  ILE*     1.3    76.2    -      -       -      +
    179E  LYS*     1.3    58.3    +      -       -      +
    182E  ASN*     3.0    30.0    +      -       -      +
    216E  GLY      3.9     0.2    -      -       -      +
    217E  SER*     3.1    28.0    -      -       -      +
    220E  PHE*     3.2    35.8    +      -       -      +
    221E  SER*     3.6    10.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 179 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155E  GLU      5.4     1.5    +      -       -      +
    156E  LYS*     4.4    24.7    -      -       +      +
    157E  ILE      3.1    26.8    +      -       -      +
    158E  GLN*     3.6    20.1    -      -       +      +
    175E  ILE*     2.9    36.3    +      -       +      +
    176E  LEU*     3.6     7.0    -      -       +      +
    178E  ALA*     1.3    77.2    -      -       -      +
    180E  THR*     1.3    56.7    +      -       -      +
    182E  ASN*     3.5     5.8    +      -       -      +
    183E  PHE*     2.9    27.0    +      -       -      +
    217E  SER*     3.8    28.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 180 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137E  ALA*     4.4    21.3    -      -       +      +
    144E  TRP*     3.9    10.3    -      -       -      +
    156E  LYS*     3.2    31.8    +      -       -      +
    176E  LEU      2.9    15.3    +      -       -      +
    177E  ILE*     3.0    30.3    -      -       +      +
    179E  LYS*     1.3    73.7    -      -       -      +
    181E  PHE*     1.3    68.4    +      -       +      +
    183E  PHE*     3.0     9.4    +      -       -      +
    184E  TYR*     3.0    42.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 181 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135E  CYS*     3.8    15.7    -      -       +      -
    137E  ALA*     6.1     1.1    -      -       +      -
    138E  LEU*     3.5    33.7    -      -       +      -
    177E  ILE*     3.0    16.8    +      -       +      +
    178E  ALA      4.0     2.5    -      -       -      +
    180E  THR*     1.3    79.3    -      -       +      +
    182E  ASN*     1.3    58.2    +      -       -      +
    184E  TYR*     3.4     5.9    +      -       -      +
    185E  ASP*     2.9    24.8    +      -       -      +
    220E  PHE*     3.5    29.8    -      +       +      -
    226E  ARG*     3.2    36.6    -      -       +      -
    229E  ALA*     3.3    25.8    -      -       +      -
    230E  MET*     3.6    19.3    -      -       +      -
    233E  TYR*     3.9    15.9    -      +       -      -
----------------------------------------------------------
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Residues in contact with ASN 182 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178E  ALA      3.0    18.2    +      -       -      +
    179E  LYS*     3.6     7.7    +      -       -      +
    181E  PHE*     1.3    75.3    -      -       -      +
    183E  PHE*     1.3    68.9    +      -       -      +
    185E  ASP*     3.6     0.2    -      -       -      +
    186E  TYR*     2.9    23.7    +      -       -      +
    212E  TYR*     3.2    28.9    -      -       -      +
    213E  ASP*     2.8    38.7    +      -       -      +
    216E  GLY*     3.2    27.6    -      -       -      -
    217E  SER*     4.0     4.4    +      -       -      +
    220E  PHE*     3.5    12.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 183 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152E  PRO      4.8     3.1    -      -       -      -
    153E  TYR*     3.9    31.2    -      +       -      -
    155E  GLU*     3.9    42.4    -      -       +      -
    156E  LYS*     5.4     5.8    -      -       +      -
    179E  LYS      2.9    16.5    +      -       -      +
    180E  THR*     3.1    13.0    -      -       -      +
    182E  ASN*     1.3    81.1    -      -       -      +
    184E  TYR*     1.3    77.7    +      +       -      +
    186E  TYR*     3.6     5.8    +      -       -      +
    187E  MET*     3.0    54.6    +      -       +      +
    209E  LYS*     6.3     1.3    -      -       -      -
    213E  ASP*     5.3     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 184 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130E  ASN*     4.5     7.2    -      -       -      -
    131E  VAL*     3.8    19.7    -      -       +      +
    134E  SER*     3.4    47.2    +      -       -      -
    135E  CYS*     3.8    26.5    -      -       -      -
    144E  TRP*     4.3     5.3    -      +       -      -
    148E  ILE*     3.9     8.7    -      -       -      +
    153E  TYR*     2.7    28.3    +      +       -      -
    180E  THR*     3.0    40.5    +      -       -      +
    181E  PHE      4.0     1.1    -      -       -      +
    183E  PHE*     1.3    86.9    -      +       -      +
    185E  ASP*     1.3    60.2    +      -       -      +
    187E  MET*     3.3    27.8    +      -       +      +
    188E  LEU*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 185 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105E  ARG*     3.7     7.0    +      -       -      -
    181E  PHE      2.9    16.4    +      -       -      +
    182E  ASN*     3.6     4.7    -      -       -      +
    184E  TYR*     1.3    76.7    -      -       -      +
    186E  TYR*     1.3    62.6    +      -       -      +
    188E  LEU*     3.1     5.2    +      -       -      +
    189E  PHE*     3.0    38.6    +      -       -      -
    212E  TYR*     2.6    34.9    +      -       +      -
    220E  PHE*     3.6    25.4    -      -       +      -
    233E  TYR*     2.4    35.1    +      -       -      +
    255E  TYR*     4.4     6.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 186 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182E  ASN      2.9    16.6    +      -       -      +
    183E  PHE*     3.8     5.2    -      -       -      +
    185E  ASP*     1.3    76.3    +      -       -      +
    187E  MET*     1.3    70.9    +      -       +      +
    189E  PHE*     4.2     0.8    -      -       -      +
    190E  GLN*     2.9    47.8    +      -       +      +
    205E  PHE*     3.2    39.2    +      +       +      -
    206E  ASN*     3.5    19.2    +      -       -      -
    209E  LYS*     3.5    45.8    -      -       +      +
    212E  TYR*     3.5    41.0    -      +       +      -
    213E  ASP*     4.2     9.2    -      -       -      +
     76F  GLU      5.3     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 187 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127E  ILE*     5.7     1.8    -      -       +      +
    130E  ASN*     4.2    19.1    -      -       -      +
    131E  VAL*     4.6     7.4    -      -       +      -
    183E  PHE*     3.0    47.3    +      -       +      +
    184E  TYR*     3.4    23.8    -      -       +      +
    186E  TYR*     1.3    82.1    -      -       +      +
    188E  LEU*     1.3    61.4    +      -       -      +
    190E  GLN*     5.0     1.3    -      -       -      -
    191E  ARG*     2.9    76.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 188 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113E  MET*     4.4     1.8    -      -       +      -
    127E  ILE*     5.9     2.7    -      -       -      -
    128E  MET*     4.7    18.8    -      -       +      +
    131E  VAL*     3.7    30.5    -      -       +      +
    184E  TYR      2.9    13.8    +      -       -      +
    185E  ASP*     3.1    10.7    +      -       -      +
    187E  MET*     1.3    76.6    -      -       -      +
    189E  PHE*     1.3    88.2    +      -       +      +
    191E  ARG*     4.1     1.9    -      -       -      +
    192E  LEU*     2.9    49.9    +      -       +      +
    233E  TYR*     3.5    36.8    -      -       +      -
    236E  LEU*     4.4    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 189 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105E  ARG*     3.6    35.2    -      -       +      -
    109E  SER*     3.6    21.1    -      -       -      -
    112E  PHE*     3.7     8.6    -      +       -      -
    113E  MET*     3.6    21.5    -      -       +      -
    185E  ASP*     3.0    32.1    +      -       -      +
    186E  TYR      4.2     1.6    -      -       -      +
    188E  LEU*     1.3    93.2    -      -       +      +
    190E  GLN*     1.3    57.9    +      -       -      +
    192E  LEU*     3.6     1.7    +      -       -      -
    193E  ALA*     2.9    29.0    +      -       -      +
    205E  PHE*     3.4    22.9    -      +       +      -
    212E  TYR*     3.1    23.8    -      -       +      +
    232E  PHE*     3.7    28.3    -      +       -      -
    233E  TYR*     4.7     1.8    -      +       -      -
    255E  TYR*     4.8     3.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLN 190 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186E  TYR*     2.9    48.6    +      -       +      +
    187E  MET*     4.3     1.9    -      -       -      +
    189E  PHE*     1.3    75.4    -      -       -      +
    191E  ARG*     1.3    76.5    +      -       -      +
    193E  ALA*     2.9    21.2    +      -       -      +
    194E  PHE*     3.0    35.0    +      -       +      -
    202E  GLY*     4.2     6.1    -      -       -      +
    205E  PHE*     3.7    19.2    -      -       +      -
    206E  ASN*     3.0    24.5    +      -       -      -
     76F  GLU*     3.3    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 191 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127E  ILE*     3.6    36.9    -      -       +      +
    187E  MET*     2.9    66.3    +      -       -      +
    188E  LEU*     5.1     0.2    -      -       -      -
    190E  GLN*     1.3    89.2    +      -       -      +
    192E  LEU*     1.3    61.0    +      -       -      +
    194E  PHE*     3.4     4.1    +      -       -      +
    195E  HIS*     2.8    36.7    +      -       +      +
     76F  GLU*     5.7     4.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 192 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112E  PHE*     3.6    13.6    -      -       +      +
    113E  MET*     4.1    19.7    -      -       +      -
    116E  ALA*     3.6    23.4    -      -       +      +
    117E  PHE*     4.1    10.8    -      -       +      -
    124E  ALA*     3.7    31.0    -      -       +      -
    127E  ILE*     3.8    16.4    -      -       +      -
    128E  MET*     4.0    24.9    -      -       +      -
    188E  LEU*     2.9    41.7    +      -       +      +
    189E  PHE*     3.9     3.8    -      -       -      +
    191E  ARG*     1.3    78.0    -      -       -      +
    193E  ALA*     1.3    60.9    +      -       -      +
    195E  HIS*     3.5    10.7    +      -       +      +
    196E  SER      3.8     1.4    +      -       -      -
    236E  LEU*     4.9     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 193 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112E  PHE*     3.4    16.2    -      -       +      -
    189E  PHE      2.9    19.2    +      -       -      +
    190E  GLN      2.9     7.9    +      -       -      +
    192E  LEU*     1.3    78.3    -      -       -      +
    194E  PHE*     1.3    55.3    +      -       -      +
    195E  HIS      3.5     0.2    -      -       -      -
    196E  SER*     2.9    18.3    +      -       -      -
    198E  ASN      3.6     1.6    -      -       -      +
    201E  TYR*     3.4    36.4    -      -       +      +
    202E  GLY*     3.6     6.4    +      -       -      +
    205E  PHE*     3.7    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 194 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190E  GLN*     3.0    35.5    +      -       -      +
    191E  ARG*     4.0     6.3    -      -       -      +
    192E  LEU      3.2     0.2    -      -       -      -
    193E  ALA*     1.3    76.1    -      -       -      +
    195E  HIS*     1.3    62.5    +      -       +      +
    196E  SER      3.0     9.6    +      -       -      -
    197E  GLY*     3.5    10.9    +      -       -      -
    198E  ASN      4.5     3.8    +      -       -      +
    199E  GLN*     3.6    34.1    -      -       +      -
    202E  GLY*     3.5    19.3    -      -       -      -
    203E  LEU*     3.8    12.8    -      -       +      -
    206E  ASN*     3.1    28.3    -      -       -      -
     75F  MET*     3.1    28.7    -      -       +      -
     76F  GLU*     4.2     8.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 195 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115E  TYR      4.6     0.2    -      -       -      +
    116E  ALA*     3.2    24.4    -      -       +      -
    119E  LEU*     4.8     1.0    -      -       -      +
    120E  ASN*     3.6    36.8    +      -       +      +
    123E  SER*     3.5    37.0    +      -       -      -
    124E  ALA*     5.5     1.1    -      -       -      +
    126E  ARG*     5.1     6.2    +      -       -      -
    127E  ILE*     4.7    15.3    -      -       +      -
    191E  ARG*     2.8    29.8    +      -       +      +
    192E  LEU*     3.5     8.8    +      -       +      +
    194E  PHE*     1.3    80.9    -      -       +      +
    196E  SER*     1.3    58.6    +      -       -      +
    197E  GLY      3.3     1.8    -      -       -      -
----------------------------------------------------------
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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