Contacts of the helix formed by residues 169 - 194 (chain A) in PDB entry 5E9W


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 ILE 169 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  SER      4.5     0.4    -      -       -      +
    168A  ARG*     1.3    86.3    -      -       +      +
    170A  PHE*     1.3    65.5    +      -       -      +
    171A  TYR      3.2     3.1    -      -       -      -
    172A  LEU*     3.0    17.3    +      -       +      +
    173A  ARG*     2.9    50.0    +      -       +      +
    340A  ILE*     4.1    27.6    -      -       +      +
    362A  LEU*     4.3    22.0    -      -       +      +
    363A  GLU*     4.0    27.4    -      -       +      +
    460A  GLU*     5.6     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  SER*     3.3    33.9    +      -       -      +
    169A  ILE*     1.3    77.0    -      -       -      +
    171A  TYR*     1.3    97.9    +      +       -      +
    173A  ARG*     3.5    30.7    +      -       +      +
    174A  ASN*     2.9    41.2    +      -       +      +
    415A  MET      4.6     0.7    -      -       -      -
    416A  GLN*     4.1    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  SER      4.7    11.2    -      -       -      -
    168A  ARG      5.5     0.6    +      -       -      -
    169A  ILE      3.2     0.8    -      -       -      -
    170A  PHE*     1.3   101.6    -      +       -      +
    172A  LEU*     1.3    57.5    +      -       -      +
    174A  ASN*     3.4     4.4    -      -       -      +
    175A  PHE*     2.9    29.1    +      -       -      +
    416A  GLN*     3.5    28.0    -      -       +      -
    455A  THR      5.2     5.6    -      -       -      +
    456A  LEU*     3.8    10.2    -      -       +      +
    460A  GLU*     4.1    26.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169A  ILE*     3.0    20.5    +      -       +      +
    171A  TYR*     1.3    76.0    -      -       -      +
    173A  ARG*     1.3    59.6    +      -       +      +
    175A  PHE*     3.3     6.4    +      -       +      +
    176A  ASN*     3.0    42.5    +      -       -      +
    340A  ILE*     3.9    21.8    -      -       +      -
    362A  LEU*     4.3    17.0    -      -       +      -
    456A  LEU*     4.5     8.9    -      -       +      +
    460A  GLU*     3.8    23.5    +      -       +      +
    463A  ALA*     3.9    21.3    -      -       +      -
    464A  THR*     3.8    32.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  SER      5.0     6.7    -      -       -      +
    169A  ILE*     2.9    42.7    +      -       +      +
    170A  PHE*     3.8    35.0    -      -       -      +
    172A  LEU*     1.3    74.2    -      -       +      +
    174A  ASN*     1.3    65.9    +      -       -      +
    176A  ASN*     3.2    12.1    +      -       -      +
    177A  ASN*     3.0    31.2    +      -       -      +
    362A  LEU*     6.2     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  PHE*     2.9    29.7    +      -       +      +
    171A  TYR*     3.4    10.1    -      -       -      +
    172A  LEU      3.2     0.2    -      -       -      -
    173A  ARG*     1.3    77.2    -      -       -      +
    175A  PHE*     1.3    58.2    -      -       -      +
    177A  ASN*     3.2    10.2    +      -       -      +
    178A  TRP*     2.9    25.5    +      -       -      +
    412A  LEU*     4.7     4.3    -      -       -      +
    415A  MET*     2.4    52.8    +      -       -      +
    416A  GLN*     3.1    25.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171A  TYR      2.9    14.5    +      -       -      +
    172A  LEU      3.4     5.6    -      -       -      +
    174A  ASN*     1.3    79.4    -      -       -      +
    176A  ASN*     1.3    64.0    +      -       -      +
    178A  TRP*     3.0    17.5    +      +       -      +
    179A  MET*     2.8    63.6    +      -       +      +
    395A  PHE*     4.3     3.8    -      +       +      -
    399A  TYR*     3.7    27.8    -      +       +      -
    412A  LEU*     4.5    11.7    -      -       +      -
    455A  THR*     4.7     6.1    -      -       +      -
    456A  LEU*     3.8    24.0    -      -       +      -
    461A  TRP*     3.8    27.4    -      +       -      -
    464A  THR*     3.6    30.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  LEU*     3.0    29.0    +      -       -      +
    173A  ARG*     3.6    12.3    -      -       -      +
    175A  PHE*     1.3    74.3    -      -       -      +
    177A  ASN*     1.3    57.7    +      -       -      +
    179A  MET*     3.2     8.3    +      -       -      +
    180A  LYS*     2.9    36.6    +      -       -      +
    285A  PHE*     4.0    32.3    -      -       +      -
    362A  LEU*     6.2     2.6    -      -       -      +
    395A  PHE*     3.9     7.3    -      -       -      -
    464A  THR*     3.7    19.6    +      -       -      -
    467A  TYR*     5.7     4.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173A  ARG*     3.0    20.2    +      -       -      +
    174A  ASN*     3.3    12.1    -      -       -      +
    176A  ASN*     1.3    76.5    -      -       -      +
    178A  TRP*     1.3    57.6    +      -       -      +
    180A  LYS*     3.4    16.2    +      -       -      +
    181A  SER*     2.8    34.0    +      -       -      -
    210A  GLY*     4.1     5.0    -      -       -      +
    214A  LYS*     2.9    29.7    +      -       -      -
    415A  MET*     3.8    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  ASN      2.9    12.9    +      -       -      +
    175A  PHE*     3.0    15.2    +      +       -      +
    177A  ASN*     1.3    75.0    -      -       -      +
    179A  MET*     1.3    89.2    +      -       +      +
    181A  SER*     3.2     2.6    +      -       -      -
    182A  VAL*     3.1    36.8    +      -       +      +
    398A  PHE*     5.8     0.4    -      +       -      -
    399A  TYR*     3.8    26.2    -      +       -      -
    402A  LYS*     4.0    18.6    -      -       +      -
    403A  ILE*     3.9    24.7    -      -       +      -
    408A  ASN*     2.8    44.5    +      -       +      -
    411A  LEU*     3.9     9.5    -      -       +      +
    412A  LEU*     3.3    41.6    -      -       +      +
    415A  MET*     3.7    19.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  PHE*     2.8    52.0    +      -       +      +
    176A  ASN*     3.4     8.1    -      -       -      +
    178A  TRP*     1.3    93.8    -      -       +      +
    180A  LYS*     1.3    64.4    +      -       +      +
    182A  VAL*     3.4     1.1    +      -       -      -
    183A  LEU*     3.0    24.3    +      -       -      +
    317A  THR*     6.0     1.6    -      -       +      -
    395A  PHE*     3.4    63.3    -      -       +      +
    398A  PHE*     3.5    36.7    -      -       +      -
    399A  TYR*     4.5     2.0    -      -       -      -
    469A  VAL*     4.1     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  ASN*     2.9    20.5    +      -       -      +
    177A  ASN*     3.7    23.0    +      -       -      +
    179A  MET*     1.3    76.7    -      -       +      +
    181A  SER*     1.3    56.8    +      -       -      +
    183A  LEU*     3.3     7.0    +      -       -      +
    184A  ILE*     2.8    42.0    +      -       +      +
    210A  GLY*     4.7     2.2    -      -       -      -
    211A  ASP*     2.7    31.9    +      -       -      +
    214A  LYS*     4.0     8.5    -      -       +      -
    284A  GLN*     3.6    33.9    -      -       +      +
    285A  PHE*     3.9    18.6    -      -       +      -
    317A  THR*     5.1     3.1    -      -       +      +
    500A  SAH      2.6    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177A  ASN      2.8    22.5    +      -       -      -
    178A  TRP*     3.2     9.5    +      -       -      -
    180A  LYS*     1.3    76.1    -      -       -      +
    182A  VAL*     1.3    56.9    +      -       -      +
    184A  ILE*     3.8     3.0    -      -       -      +
    185A  GLY*     2.8    26.5    +      -       -      -
    214A  LYS*     3.2    27.0    -      -       -      +
    411A  LEU*     4.5    18.2    -      -       -      -
    415A  MET*     4.7     7.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  TRP*     3.1    41.1    +      -       +      +
    179A  MET*     4.0     2.9    -      -       -      +
    181A  SER*     1.3    73.4    -      -       -      +
    183A  LEU*     1.3    61.8    +      -       -      +
    185A  GLY*     3.7     1.3    -      -       -      -
    186A  GLU*     2.9    28.1    +      -       -      +
    398A  PHE*     4.4     4.5    -      -       +      -
    402A  LYS*     3.5    33.0    -      -       +      +
    408A  ASN*     3.4    43.5    -      -       -      +
    411A  LEU*     4.6     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  MET      3.0    17.3    +      -       -      +
    180A  LYS*     3.6     5.2    -      -       -      +
    182A  VAL*     1.3    74.2    -      -       -      +
    184A  ILE*     1.3    66.0    +      -       -      +
    186A  GLU*     3.2    10.9    +      -       -      +
    187A  PHE*     3.3    52.2    +      -       +      +
    284A  GLN*     3.9    31.6    -      -       -      +
    315A  ILE*     4.2    11.7    -      -       +      -
    316A  GLY      4.1    21.3    -      -       -      +
    317A  THR*     4.6     7.2    -      -       +      -
    391A  TYR*     3.8    13.0    -      -       +      +
    398A  PHE*     4.1    17.8    -      -       +      -
    469A  VAL*     4.7     7.6    -      -       +      -
    470A  PHE      4.6     5.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180A  LYS*     2.8    26.1    +      -       +      +
    181A  SER*     3.9     3.8    -      -       -      +
    183A  LEU*     1.3    73.5    -      -       -      +
    185A  GLY*     1.3    63.0    +      -       -      +
    187A  PHE*     3.4     0.9    +      -       -      +
    188A  LEU*     3.0    34.5    +      -       +      +
    211A  ASP*     4.3    11.9    -      -       -      +
    214A  LYS*     4.1    32.1    -      -       +      +
    215A  TRP*     3.4    56.5    -      -       +      +
    280A  ILE*     5.2     0.5    -      -       -      +
    282A  SER*     4.4     5.2    -      -       -      +
    284A  GLN*     4.8     5.2    -      -       -      +
    315A  ILE*     4.4    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  SER      2.8    19.7    +      -       -      -
    182A  VAL*     3.7     2.7    -      -       -      -
    183A  LEU      3.1     0.2    -      -       -      -
    184A  ILE*     1.3    79.6    -      -       -      +
    186A  GLU*     1.3    61.3    +      -       -      +
    188A  LEU*     3.6     6.4    +      -       -      +
    189A  GLU*     3.4    21.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  VAL      2.9    17.1    +      -       -      +
    183A  LEU*     3.2     5.3    +      -       -      +
    185A  GLY*     1.3    76.9    -      -       -      +
    187A  PHE*     1.3    63.1    +      -       +      +
    189A  GLU*     3.4     9.6    +      -       -      +
    190A  LYS*     2.3    60.3    +      -       +      +
    391A  TYR*     2.7    35.9    +      -       -      -
    398A  PHE*     4.3     1.7    -      -       -      -
    401A  GLU*     5.2     0.8    -      -       -      +
    402A  LYS*     3.0    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  LEU*     3.3    35.4    +      -       +      +
    184A  ILE      4.4     0.9    -      -       -      +
    186A  GLU*     1.3    80.2    -      -       +      +
    188A  LEU*     1.3    60.8    +      -       -      +
    189A  GLU      3.2     1.1    -      -       -      -
    190A  LYS*     3.7    22.7    -      -       +      +
    191A  VAL*     2.9    33.4    +      -       -      +
    280A  ILE*     3.9    14.8    -      -       +      -
    313A  TYR*     3.7    37.6    -      +       +      -
    315A  ILE*     3.9    16.8    -      -       +      -
    390A  VAL*     4.2     6.5    -      -       +      -
    391A  TYR*     3.1    38.6    -      +       -      -
    471A  ALA*     3.3    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184A  ILE*     3.0    28.0    +      -       +      +
    185A  GLY*     3.9     7.0    -      -       -      +
    187A  PHE*     1.3    77.5    -      -       -      +
    189A  GLU*     1.3    58.7    +      -       -      +
    191A  VAL*     3.5     3.3    +      -       +      +
    192A  ARG*     3.0    46.9    +      -       -      +
    199A  ILE*     3.9    19.5    -      -       +      -
    214A  LYS      4.9     0.7    -      -       -      +
    215A  TRP*     3.8    25.6    -      -       +      -
    218A  GLY*     3.6    30.7    -      -       -      +
    220A  ILE*     3.7    21.3    -      -       +      -
    280A  ILE*     4.0    11.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185A  GLY      3.4    10.4    +      -       -      +
    186A  GLU*     3.6    11.8    -      -       -      +
    187A  PHE      3.2     0.6    -      -       -      -
    188A  LEU*     1.3    78.4    -      -       -      +
    190A  LYS*     1.3    60.6    +      -       +      +
    192A  ARG*     3.2     7.8    +      -       +      +
    193A  GLN*     2.8    53.9    +      -       -      +
    231C  VAL*     5.2    10.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  GLU*     2.3    49.3    +      -       +      +
    187A  PHE*     3.7    31.6    -      -       +      +
    189A  GLU*     1.3    77.5    -      -       +      +
    191A  VAL*     1.3    64.6    +      -       -      +
    193A  GLN*     3.3    16.3    +      -       -      +
    194A  LYS*     3.3    20.2    +      -       -      +
    313A  TYR*     3.9    27.6    -      -       +      +
    390A  VAL*     4.8     6.3    -      -       +      +
    391A  TYR*     4.4     4.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  PHE      2.9    21.3    +      -       -      +
    188A  LEU*     3.7     6.1    -      -       -      +
    190A  LYS*     1.3    75.2    -      -       -      +
    192A  ARG*     1.3    63.4    +      -       -      +
    194A  LYS*     3.3    17.2    +      -       -      +
    196A  LYS*     3.4    24.2    +      -       +      +
    199A  ILE*     3.5    29.4    -      -       +      -
    279A  ASP*     3.9    20.9    -      -       +      +
    280A  ILE*     3.7    25.6    -      -       +      -
    311A  GLY      5.3     2.0    -      -       -      +
    312A  GLY*     5.4     0.4    -      -       -      -
    313A  TYR*     3.8    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  LEU*     3.0    36.3    +      -       -      +
    189A  GLU*     3.2     8.2    +      -       -      +
    191A  VAL*     1.3    77.9    -      -       -      +
    193A  GLN*     1.3    56.1    +      -       -      +
    195A  LYS*     3.0    19.8    +      -       -      -
    196A  LYS      3.7    18.9    +      -       -      +
    197A  ARG      4.6     7.1    +      -       -      -
    199A  ILE*     4.0    22.6    -      -       +      +
    218A  GLY*     2.5    32.1    +      -       -      -
    219A  ARG*     3.0    52.1    +      -       -      +
    230C  ASP*     3.7     8.3    -      -       -      +
    231C  VAL*     4.1    18.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  GLU*     2.8    45.2    +      -       -      +
    190A  LYS*     3.3     8.5    +      -       -      +
    192A  ARG*     1.3    68.6    -      -       -      +
    194A  LYS*     1.3    58.7    +      -       +      +
    195A  LYS      3.0     4.9    -      -       -      -
    208C  LYS*     6.2     0.4    -      -       -      +
    228C  ILE      3.3    12.0    -      -       -      +
    229C  ALA*     3.4    34.2    -      -       +      +
    230C  ASP*     2.9    31.5    +      -       -      +
    231C  VAL*     3.4    29.1    -      -       +      +
    232C  SER*     4.0     9.3    +      -       -      -
    259C  THR*     4.6     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  LYS      3.3    12.9    +      -       -      +
    191A  VAL*     3.6     9.9    -      -       -      +
    192A  ARG      3.2     0.6    -      -       -      -
    193A  GLN*     1.3    77.6    -      -       -      +
    195A  LYS*     1.3    67.7    +      -       -      +
    196A  LYS*     3.4     6.9    +      -       +      +
    311A  GLY*     2.8    30.9    +      -       -      +
    313A  TYR*     3.0    21.4    +      -       +      -
    473A  GLU*     2.3    32.5    +      -       -      -
    228C  ILE      5.2     1.1    -      -       -      -
    259C  THR*     5.5     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