Contacts of the helix formed by residues 165 - 193 (chain E) in PDB entry 6C3P


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 165 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95E  SER*     4.8     8.5    +      -       -      -
    157E  PHE*     4.6     2.3    -      -       -      -
    163E  GLY*     3.0     4.8    -      -       -      -
    164E  PHE*     1.3    76.5    +      -       -      +
    166E  GLN*     1.3    56.6    +      -       -      +
    167E  LEU*     3.0     6.1    -      -       -      +
    168E  ARG*     2.7    58.1    +      -       -      +
    169E  PHE      3.5     1.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 166 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163E  GLY      3.3    13.0    +      -       -      +
    164E  PHE      3.4     4.0    +      -       -      +
    165E  SER*     1.3    72.9    -      -       -      +
    167E  LEU*     1.3    56.1    +      -       -      +
    169E  PHE*     3.0    14.5    +      -       +      +
    170E  CYS*     3.0    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 167 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91E  GLU*     6.3     2.9    -      -       +      -
    165E  SER*     3.0     4.9    -      -       -      -
    166E  GLN*     1.3    75.8    -      -       -      +
    168E  ARG*     1.3    64.4    +      -       -      +
    170E  CYS*     4.4     5.8    -      -       -      +
    171E  LEU*     2.9    40.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 168 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91E  GLU*     5.3     6.2    +      -       -      +
     92E  GLY*     5.8     1.4    -      -       -      -
     95E  SER*     4.0    21.4    +      -       -      -
    106E  LEU*     4.0    30.8    +      -       -      +
    153E  LYS*     4.5    14.1    -      -       -      +
    157E  PHE*     3.5    30.1    -      -       +      -
    165E  SER*     2.7    38.8    +      -       -      +
    167E  LEU*     1.3    74.1    -      -       -      +
    169E  PHE*     1.3    51.2    +      -       -      +
    171E  LEU*     3.9     4.8    -      -       -      +
    172E  THR*     2.6    43.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 169 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154E  PHE*     3.5    37.8    -      +       -      -
    157E  PHE*     3.4    36.9    -      +       +      -
    158E  LEU*     4.3    26.9    -      -       +      -
    163E  GLY*     6.0     0.7    -      -       -      -
    165E  SER      3.5     1.4    +      -       -      -
    166E  GLN*     3.0    18.7    +      -       +      +
    168E  ARG*     1.3    77.3    -      -       -      +
    170E  CYS*     1.3    69.7    +      -       +      +
    172E  THR*     3.3     2.5    +      -       -      -
    173E  GLY*     3.0    20.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 170 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166E  GLN      3.0    14.7    +      -       -      +
    167E  LEU*     3.4     6.9    +      -       -      +
    169E  PHE*     1.3    82.1    -      -       +      +
    171E  LEU*     1.3    63.8    +      -       +      +
    173E  GLY*     3.4     0.9    +      -       -      -
    174E  LEU*     2.8    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84E  VAL*     4.1     9.4    -      -       +      +
     87E  CYS*     4.1    16.2    -      -       +      +
     88E  GLU*     3.9    41.5    -      -       +      +
     91E  GLU*     5.2     7.0    -      -       +      -
    167E  LEU*     2.9    35.1    +      -       +      +
    168E  ARG*     4.0     4.3    -      -       -      +
    170E  CYS*     1.3    85.0    -      -       +      +
    172E  THR*     1.3    57.7    +      -       -      +
    174E  LEU*     3.4     7.4    -      -       +      +
    175E  LEU*     2.9    41.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 172 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150E  LYS*     4.3    14.3    +      -       -      +
    153E  LYS*     3.4    31.0    +      -       +      +
    154E  PHE*     3.6    39.5    -      -       +      +
    157E  PHE*     5.0     4.9    -      -       +      -
    168E  ARG*     2.6    27.0    +      -       -      +
    169E  PHE*     3.6     5.6    -      -       -      -
    171E  LEU*     1.3    75.7    -      -       -      +
    173E  GLY*     1.3    64.3    +      -       -      +
    175E  LEU*     3.1     7.5    +      -       -      +
    176E  VAL*     3.0    25.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 173 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154E  PHE*     3.7    22.7    -      -       -      -
    169E  PHE      3.0    11.6    +      -       -      -
    170E  CYS*     3.9     2.0    -      -       -      -
    172E  THR*     1.3    77.2    -      -       -      +
    174E  LEU*     1.3    60.8    +      -       -      +
    176E  VAL*     3.2     8.3    +      -       -      +
    177E  ILE*     2.9    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 174 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84E  VAL*     3.6    42.0    -      -       +      -
    170E  CYS*     2.8    25.1    +      -       -      +
    171E  LEU*     3.4    10.3    -      -       +      +
    172E  THR      3.1     0.2    -      -       -      -
    173E  GLY*     1.3    76.3    -      -       -      +
    175E  LEU*     1.3    65.4    +      -       +      +
    177E  ILE*     3.2     8.8    +      -       +      +
    178E  LEU*     2.9    51.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81E  LEU*     4.4     5.4    -      -       +      -
     84E  VAL*     3.6    31.0    -      -       +      +
     85E  LEU*     3.5    28.3    -      -       +      -
     88E  GLU*     4.5    14.4    -      -       -      +
    150E  LYS*     3.9    22.9    -      -       -      +
    171E  LEU*     2.9    26.9    +      -       +      +
    172E  THR      3.7     4.0    -      -       -      +
    174E  LEU*     1.3    79.0    -      -       +      +
    176E  VAL*     1.3    63.9    +      -       -      +
    178E  LEU*     3.2     5.0    +      -       +      +
    179E  TYR*     2.9    57.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 176 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147E  PHE*     3.2    22.2    -      -       +      -
    150E  LYS*     3.6    37.5    -      -       +      +
    151E  THR*     3.6    24.5    -      -       +      +
    154E  PHE*     4.1    16.8    -      -       +      -
    172E  THR*     3.0    16.1    +      -       +      +
    173E  GLY*     3.2     9.8    +      -       -      +
    175E  LEU*     1.3    78.5    -      -       -      +
    177E  ILE*     1.3    69.9    +      -       +      +
    179E  TYR*     3.3     0.4    +      -       -      -
    180E  GLY      2.9    18.5    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    147E  PHE*     5.4     0.2    -      -       -      -
    173E  GLY*     2.9    17.3    +      -       -      +
    174E  LEU*     3.7    10.3    -      -       +      +
    176E  VAL*     1.3    83.1    -      -       +      +
    178E  LEU*     1.3    63.7    +      -       +      +
    180E  GLY*     3.3     1.9    +      -       -      +
    181E  MET*     2.9    49.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 178 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77E  LEU*     4.3    20.5    -      -       +      +
     80E  MET*     3.9    11.7    -      -       +      -
     81E  LEU*     3.5    48.4    -      -       +      +
     84E  VAL*     4.0     3.4    -      -       +      -
    174E  LEU*     2.9    57.3    +      -       +      +
    175E  LEU*     3.2     9.4    +      -       +      +
    177E  ILE*     1.3    83.3    -      -       +      +
    179E  TYR*     1.3    58.6    +      -       -      +
    181E  MET*     3.3     7.0    +      -       +      +
    182E  LEU*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 179 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36E  HIS*     3.8    20.4    +      -       -      -
     81E  LEU*     3.5    21.0    -      -       +      +
     85E  LEU*     4.8     1.7    -      -       -      +
    113E  ALA*     4.7     6.8    -      -       -      +
    143E  TRP*     3.5    38.7    -      +       +      +
    146E  ALA*     3.9    25.4    -      -       +      -
    147E  PHE*     3.5    25.9    -      +       +      +
    150E  LYS*     3.4    36.5    -      -       +      +
    175E  LEU*     2.9    37.3    +      -       +      +
    176E  VAL*     5.0     0.2    -      -       -      -
    178E  LEU*     1.3    77.9    -      -       -      +
    180E  GLY*     1.3    57.6    +      -       -      +
    182E  LEU*     3.2     5.4    +      -       -      +
    183E  LEU*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 180 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147E  PHE*     3.5    20.3    -      -       -      -
    176E  VAL      2.9    12.0    +      -       -      -
    177E  ILE*     3.7     3.4    -      -       -      -
    179E  TYR*     1.3    77.4    -      -       -      +
    181E  MET*     1.3    56.2    +      -       -      +
    183E  LEU*     3.1     9.3    +      -       -      +
    184E  LEU*     2.9    27.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 181 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77E  LEU*     3.5    30.5    -      -       +      -
    177E  ILE*     2.9    36.9    +      -       +      +
    178E  LEU*     3.3     2.9    +      -       +      +
    180E  GLY*     1.3    75.4    -      -       -      +
    182E  LEU*     1.3    57.6    +      -       -      +
    184E  LEU*     3.3    22.6    +      -       +      +
    185E  VAL*     2.9    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 182 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74E  ARG*     4.4    24.7    -      -       +      +
     77E  LEU*     3.6    21.9    -      -       +      +
     78E  THR*     4.7     7.2    -      -       -      +
     81E  LEU*     6.0     2.2    -      -       +      -
    143E  TRP*     3.3    61.9    -      -       +      +
    178E  LEU      2.9    14.2    +      -       -      +
    179E  TYR*     3.4    12.3    -      -       +      +
    181E  MET*     1.3    74.5    -      -       -      +
    183E  LEU*     1.3    60.3    +      -       -      +
    185E  VAL*     3.1     9.1    +      -       +      +
    186E  GLU*     2.9    31.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 183 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140E  LEU*     3.6    33.0    -      -       +      +
    143E  TRP*     4.9     8.0    -      -       +      +
    144E  THR*     3.8    24.2    -      -       +      +
    147E  PHE*     5.9     7.4    -      -       +      -
    179E  TYR      2.9    13.1    +      -       -      +
    180E  GLY*     3.4    11.4    -      -       -      +
    182E  LEU*     1.3    77.1    -      -       -      +
    184E  LEU*     1.3    60.7    +      -       -      +
    186E  GLU*     2.9     8.4    +      -       +      +
    187E  VAL*     2.9    39.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 184 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180E  GLY      2.9    12.7    +      -       -      +
    181E  MET*     3.5    26.5    -      -       -      +
    182E  LEU      3.2     0.2    -      -       -      -
    183E  LEU*     1.3    76.0    -      -       +      +
    185E  VAL*     1.3    61.1    +      -       -      +
    187E  VAL*     3.0    20.2    -      -       +      +
    188E  ASN*     2.7    45.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 185 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69E  PRO      5.4     3.1    -      -       -      +
     70E  GLY*     4.5     7.4    -      -       -      +
     73E  LEU*     4.7     8.7    -      -       +      -
     74E  ARG*     3.5    51.8    -      -       +      +
     77E  LEU*     3.7    19.1    -      -       +      -
    181E  MET      2.9    18.7    +      -       -      +
    182E  LEU*     3.1    12.5    +      -       +      +
    184E  LEU*     1.3    75.4    -      -       -      +
    186E  GLU*     1.3    57.8    +      -       -      +
    188E  ASN*     3.2    13.4    +      -       +      +
    189E  VAL*     3.0    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 186 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74E  ARG*     3.9    13.9    +      -       -      -
    136E  LEU*     4.4     4.7    -      -       -      +
    137E  ILE*     3.9    25.8    +      -       -      +
    139E  LEU*     4.4    11.3    -      -       -      +
    140E  LEU*     3.8    40.6    -      -       +      +
    143E  TRP*     5.9     1.1    -      -       +      -
    182E  LEU*     2.9    20.9    +      -       +      +
    183E  LEU*     2.9    15.9    +      -       +      +
    185E  VAL*     1.3    78.0    -      -       -      +
    187E  VAL*     1.3    57.7    +      -       -      +
    189E  VAL*     3.0    15.5    -      -       -      +
    190E  ILE*     2.9    28.6    +      -       +      +
    195E  TYR*     4.7     2.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 187 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140E  LEU*     5.1     7.2    -      -       +      -
    183E  LEU*     2.9    33.5    +      -       +      +
    184E  LEU*     3.0    38.4    -      -       +      +
    186E  GLU*     1.3    74.2    -      -       +      +
    188E  ASN*     1.3    62.4    +      -       -      +
    190E  ILE*     3.5     7.1    -      -       +      +
    191E  ARG*     2.9    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 188 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69E  PRO*     5.3     1.6    -      -       -      +
     70E  GLY*     6.5     1.3    -      -       -      -
    184E  LEU*     2.7    46.4    +      -       -      +
    185E  VAL*     3.3    14.5    -      -       +      +
    187E  VAL*     1.3    81.4    -      -       -      +
    189E  VAL*     1.3    57.1    +      -       -      +
    191E  ARG*     3.8     3.3    -      -       -      +
    192E  VAL*     2.9    37.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 189 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68E  PHE*     4.4     8.3    -      -       -      +
     69E  PRO*     3.7    40.6    +      -       +      +
     74E  ARG*     3.5    23.6    -      -       -      +
    124E  TYR*     5.3     3.8    -      -       +      +
    133E  PRO*     6.2     3.6    -      -       +      -
    185E  VAL      3.0    15.5    +      -       -      +
    186E  GLU*     3.0    32.5    -      -       -      +
    188E  ASN*     1.3    75.1    -      -       -      +
    190E  ILE*     1.3    62.6    +      -       -      +
    192E  VAL*     3.9     0.7    -      -       -      +
    193E  ARG*     2.9    27.1    +      -       +      +
    195E  TYR*     4.8     2.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 190 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137E  ILE*     5.8     3.6    -      -       +      -
    140E  LEU*     6.3     3.1    -      -       +      -
    186E  GLU*     2.9    23.0    +      -       +      +
    187E  VAL*     3.5     9.9    -      -       +      +
    189E  VAL*     1.3    77.5    -      -       +      +
    191E  ARG*     1.3    64.3    +      -       -      +
    193E  ARG      2.8    13.5    +      -       -      -
    194E  ARG*     2.9    17.8    +      -       -      -
    195E  TYR*     4.5    19.1    -      -       +      +
    196E  ILE*     6.0     5.8    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    187E  VAL      2.9    20.4    +      -       -      +
    188E  ASN*     3.8     4.3    -      -       -      +
    190E  ILE*     1.3    74.4    -      -       -      +
    192E  VAL*     1.3    66.7    +      -       +      +
    193E  ARG      3.2     0.9    +      -       -      -
    194E  ARG*     3.2    19.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 192 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69E  PRO*     3.5    38.8    -      -       +      -
    188E  ASN*     2.9    24.1    +      -       +      +
    189E  VAL      3.9     0.4    -      -       -      +
    191E  ARG*     1.3    78.3    -      -       +      +
    193E  ARG*     1.3    59.0    +      -       +      +
    194E  ARG      3.6     0.9    +      -       -      -
    200E  THR      4.9     0.3    -      -       -      +
    201E  PRO      3.2    11.8    -      -       -      +
    202E  ARG*     3.5    19.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 193 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68E  PHE      6.3     0.4    -      -       -      +
     69E  PRO*     5.7     3.1    -      -       +      -
    133E  PRO*     5.1     7.9    -      -       +      -
    189E  VAL*     2.9    20.7    +      -       +      +
    190E  ILE      2.8     5.9    +      -       -      -
    192E  VAL*     1.3    79.9    -      -       +      +
    194E  ARG*     1.3    47.8    -      -       -      +
    195E  TYR*     2.1    53.2    +      -       +      +
    200E  THR      4.1     0.9    -      -       -      -
    201E  PRO*     3.3    17.9    -      -       +      +
----------------------------------------------------------
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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