Contacts of the helix formed by residues 170 - 194 (chain J) in PDB entry 5XVO


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 ASN 170 (chain J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164J  PHE*     4.1    15.0    -      -       -      -
    165J  THR      4.6     1.4    +      -       -      -
    168J  GLN      3.3    18.2    +      -       -      -
    169J  GLU*     1.3    75.7    +      -       -      +
    171J  ASP*     1.3    63.3    +      -       -      +
    172J  ILE*     2.9    12.8    +      -       +      +
    173J  ASN*     2.6    42.5    +      -       -      +
    174J  ALA*     3.1    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 171 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170J  ASN*     1.3    75.2    -      -       -      +
    172J  ILE*     1.3    63.4    +      -       +      +
    174J  ALA*     3.6     7.1    +      -       -      +
    175J  GLY      3.0    17.7    +      -       -      -
    233J  ARG      5.9     0.9    -      -       -      +
    235J  GLU      4.1     3.8    -      -       -      +
    236J  ALA*     4.1     8.0    -      -       -      +
    237J  PHE*     3.7    26.6    +      -       -      +
    240J  MET*     3.1    30.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 172 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160J  PHE*     3.7    47.1    -      -       +      -
    164J  PHE*     3.8    20.4    -      -       +      -
    170J  ASN*     2.9    11.4    +      -       -      +
    171J  ASP*     1.3    78.4    -      -       +      +
    173J  ASN*     1.3    58.6    +      -       -      +
    175J  GLY*     3.4     1.7    +      -       -      -
    176J  LEU*     3.0    34.2    +      -       +      +
    229J  ILE*     3.9     8.8    -      -       +      +
    233J  ARG*     4.0    33.4    -      -       +      +
    240J  MET*     4.4     6.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 173 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164J  PHE*     3.2    20.7    -      -       -      -
    165J  THR      3.1    19.4    +      -       -      -
    166J  ARG*     2.7    41.7    +      -       -      +
    167J  GLU      6.0     0.2    -      -       -      -
    168J  GLN      2.9    28.5    +      -       -      +
    169J  GLU*     5.4     0.9    -      -       -      -
    170J  ASN*     2.6    24.9    +      -       -      +
    172J  ILE*     1.3    70.4    -      -       -      +
    174J  ALA*     1.3    56.5    +      -       -      +
    176J  LEU*     3.1     3.1    +      -       -      +
    177J  ASN*     2.8    46.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 174 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72J  LEU*     5.5     3.0    -      -       +      +
    170J  ASN      3.1    17.3    +      -       -      +
    171J  ASP*     3.7     9.6    -      -       -      +
    173J  ASN*     1.3    76.7    -      -       -      +
    175J  GLY*     1.3    56.2    +      -       -      +
    177J  ASN*     3.5     9.4    +      -       -      +
    178J  TYR*     2.9    30.5    +      -       -      +
    237J  PHE*     3.6    24.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 175 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171J  ASP      3.0    15.6    +      -       -      -
    172J  ILE      3.7     2.0    -      -       -      -
    174J  ALA*     1.3    74.5    -      -       -      +
    176J  LEU*     1.3    64.4    +      -       -      +
    178J  TYR*     3.7     1.1    -      -       -      +
    179J  GLY*     3.0    19.1    +      -       -      -
    229J  ILE*     3.6    22.2    -      -       -      +
    237J  PHE*     3.7    13.2    -      -       -      -
    240J  MET*     4.1     4.5    -      -       -      -
    244J  LEU*     3.4    12.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 176 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156J  PHE*     3.8    23.8    -      -       +      -
    160J  PHE*     4.7     3.4    -      -       +      -
    164J  PHE*     4.5     2.2    -      -       +      -
    166J  ARG*     4.0    16.4    -      -       -      +
    172J  ILE*     3.0    28.4    +      -       +      +
    173J  ASN*     3.1    23.5    +      -       -      +
    175J  GLY*     1.3    74.8    -      -       -      +
    177J  ASN*     1.3    59.4    +      -       -      +
    179J  GLY*     3.3     1.6    +      -       -      -
    180J  TYR*     2.8    44.2    +      -       +      +
    225J  VAL*     3.9     4.6    -      -       +      +
    226J  ASP*     3.2    39.0    -      -       -      +
    229J  ILE*     3.9    18.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 177 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81I  TYR*     6.0     1.8    -      -       -      +
    166J  ARG*     2.7    35.3    +      -       -      +
    173J  ASN*     2.8    33.5    +      -       -      +
    174J  ALA*     3.7     7.8    -      -       -      +
    176J  LEU*     1.3    72.3    -      -       -      +
    178J  TYR*     1.3    61.2    +      -       -      +
    180J  TYR*     3.3     7.1    +      -       -      +
    181J  THR*     2.9    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 178 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41J  LEU*     3.8    13.9    -      -       -      +
     43J  GLU*     4.7     1.4    +      -       -      +
     67J  CYS*     5.7     1.1    -      -       -      -
     71J  ARG      4.0     8.4    +      -       -      -
     72J  LEU*     4.2    11.0    -      -       +      -
     73J  PRO*     3.4    35.3    -      -       +      +
    174J  ALA      2.9    18.7    +      -       -      +
    175J  GLY      3.7     4.7    -      -       -      +
    176J  LEU      3.3     0.2    -      -       -      -
    177J  ASN*     1.3    76.9    -      -       -      +
    179J  GLY*     1.3    64.7    +      -       -      +
    181J  THR*     3.2     9.0    +      -       -      -
    182J  LEU*     3.1    44.5    +      -       +      +
    237J  PHE*     4.3     7.0    -      +       +      -
    241J  LYS*     3.4    49.6    +      -       +      +
    244J  LEU*     3.7    13.9    -      -       +      -
    245J  PHE*     3.5    22.4    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLY 179 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175J  GLY      3.0    10.5    +      -       -      -
    176J  LEU      3.7     2.9    -      -       -      -
    178J  TYR*     1.3    79.4    -      -       -      +
    180J  TYR*     1.3    62.2    +      -       -      +
    182J  LEU*     3.1    18.4    +      -       -      +
    183J  LEU*     3.1    10.2    +      -       -      +
    225J  VAL*     3.7    26.3    -      -       -      +
    244J  LEU*     3.7    20.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 180 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156J  PHE*     3.7    14.7    -      +       -      -
    166J  ARG*     3.4    34.5    -      -       -      -
    176J  LEU*     2.8    25.8    +      -       +      +
    177J  ASN*     3.6     5.8    -      -       -      +
    179J  GLY*     1.3    75.9    -      -       -      +
    181J  THR*     1.3    57.6    +      -       -      +
    183J  LEU*     3.3     4.3    +      -       +      +
    184J  LEU*     2.9    27.2    +      -       -      +
    218J  MET*     3.5    13.8    -      -       +      +
    222J  ARG*     3.5    64.3    +      -       +      +
    225J  VAL*     4.0    12.1    -      -       +      -
    226J  ASP*     2.5    33.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 181 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80I  PHE*     3.7    43.7    -      -       +      -
     81I  TYR*     4.4    13.5    +      -       -      +
     65J  LEU*     5.8     0.7    -      -       +      -
     73J  PRO*     4.0    19.4    -      -       +      +
    177J  ASN*     2.9    16.6    +      -       -      +
    178J  TYR*     3.2     8.5    +      -       -      -
    180J  TYR*     1.3    75.0    -      -       -      +
    182J  LEU*     1.3    64.0    +      -       +      +
    184J  LEU*     3.2     8.6    +      -       +      +
    185J  SER*     2.8    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 182 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41J  LEU*     5.1     3.1    -      -       +      -
     63J  LEU*     5.0     0.7    -      -       -      +
     65J  LEU*     4.4    20.6    -      -       +      -
     73J  PRO*     5.5     6.1    -      -       +      -
    178J  TYR*     3.1    47.2    +      -       +      +
    179J  GLY*     3.1    12.5    +      -       -      +
    181J  THR*     1.3    79.9    -      -       +      +
    183J  LEU*     1.3    63.3    +      -       -      +
    185J  SER*     3.2     7.5    +      -       -      -
    186J  ILE*     3.2    26.0    +      -       +      +
    244J  LEU*     4.4    11.2    -      -       +      +
    245J  PHE*     4.7     9.2    -      -       +      -
    247J  LEU*     4.3    16.6    -      -       +      -
    248J  PHE*     4.2    32.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 183 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179J  GLY      3.1    10.4    +      -       -      +
    180J  TYR*     3.5     8.7    -      -       +      +
    182J  LEU*     1.3    79.4    -      -       -      +
    184J  LEU*     1.3    63.9    +      -       -      +
    186J  ILE*     3.0    18.0    +      -       +      +
    187J  PHE*     3.2    26.6    +      -       +      -
    218J  MET*     3.8    20.0    -      -       +      -
    221J  PHE*     3.7    42.4    -      -       +      +
    222J  ARG*     4.1     6.3    -      -       -      +
    224J  LEU*     5.5     0.7    -      -       +      -
    225J  VAL*     3.7    23.3    -      -       +      -
    247J  LEU*     4.8    10.8    -      -       +      -
    261J  LEU*     3.9    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 184 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80I  PHE*     4.0    25.1    -      -       +      -
    180J  TYR      2.9    14.3    +      -       -      +
    181J  THR*     3.2    15.0    +      -       +      +
    183J  LEU*     1.3    78.1    -      -       -      +
    185J  SER*     1.3    57.1    +      -       -      +
    187J  PHE*     3.2     1.3    +      -       -      -
    188J  ALA*     2.8    31.2    +      -       +      +
    211J  PHE*     3.6    35.0    -      -       +      -
    214J  ALA*     3.6    27.6    -      -       +      +
    215J  SER*     3.6    28.0    -      -       -      +
    218J  MET*     3.8    12.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 185 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80I  PHE*     3.4    20.4    -      -       -      -
     63J  LEU*     3.7    28.7    -      -       -      +
     65J  LEU*     3.5    11.9    -      -       -      +
     76J  LYS*     3.2    17.8    -      -       -      +
    181J  THR*     2.8    15.6    +      -       -      +
    182J  LEU*     3.5     8.5    -      -       -      -
    184J  LEU*     1.3    78.3    -      -       -      +
    186J  ILE*     1.3    62.4    +      -       -      +
    188J  ALA*     4.2     2.2    -      -       -      -
    189J  ARG*     3.1    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 186 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39J  VAL*     6.1     0.2    -      -       +      -
     63J  LEU*     4.4    11.7    -      -       +      -
    182J  LEU*     3.2    14.3    +      -       +      +
    183J  LEU*     3.0    16.5    +      -       +      +
    185J  SER*     1.3    78.3    -      -       -      +
    187J  PHE*     1.3    61.1    +      -       +      +
    189J  ARG*     3.5     8.0    +      -       -      +
    190J  GLU*     3.2    29.9    +      -       +      +
    247J  LEU*     6.1     0.9    -      -       +      -
    248J  PHE*     3.7    31.2    -      -       +      -
    261J  LEU*     4.0    25.6    -      -       +      -
    262J  THR*     4.5    20.0    -      -       +      -
    265J  ALA*     3.5    30.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 187 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183J  LEU*     3.2    29.5    +      -       +      +
    184J  LEU      4.0     4.3    -      -       -      +
    186J  ILE*     1.3    82.9    -      -       +      +
    188J  ALA*     1.3    66.6    +      -       -      +
    190J  GLU*     3.8     3.2    -      -       -      +
    191J  LEU*     3.0    29.3    +      -       +      +
    214J  ALA*     4.2    19.7    -      -       +      +
    217J  LEU*     4.0    20.0    -      -       +      -
    218J  MET*     3.8    18.4    -      -       +      -
    221J  PHE*     3.5    49.4    -      +       +      -
    261J  LEU*     5.8     1.6    -      -       +      -
    265J  ALA*     3.6    30.1    -      -       +      -
    268J  TYR*     4.1     7.0    -      +       -      -
    269J  THR*     3.5    21.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 188 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78I  LEU*     5.3     9.6    -      -       +      -
     80I  PHE*     6.4     0.7    -      -       +      -
     76J  LYS*     3.9    18.4    -      -       +      -
     78J  LEU*     6.0     2.0    -      -       +      -
    184J  LEU*     2.8    19.3    +      -       +      +
    185J  SER*     3.7     5.4    -      -       -      +
    187J  PHE*     1.3    78.1    -      -       -      +
    189J  ARG*     1.3    61.7    +      -       -      +
    191J  LEU*     3.8     2.1    -      -       -      +
    192J  VAL*     3.2    29.3    +      -       +      +
    198J  THR*     3.9    11.8    -      -       +      +
    211J  PHE*     5.4     2.9    -      -       +      -
    214J  ALA*     3.8    16.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 189 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38J  ASP*     3.0    46.6    +      -       -      +
     39J  VAL*     4.6     2.8    -      -       -      +
     61J  LYS*     3.2    29.8    +      -       +      +
     62J  ILE      4.8     0.2    -      -       -      -
     63J  LEU*     3.4    26.9    -      -       +      +
     76J  LYS*     3.6    21.2    -      -       -      +
     79J  PRO*     6.2     1.3    -      -       +      -
    185J  SER      3.1    11.5    +      -       -      +
    186J  ILE*     3.6     8.1    +      -       -      +
    188J  ALA*     1.3    83.4    -      -       -      +
    190J  GLU*     1.3    82.3    +      -       -      +
    192J  VAL*     3.4     5.6    +      -       -      +
    193J  GLN*     3.1    31.6    +      -       +      +
    262J  THR*     3.6    23.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 190 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186J  ILE*     3.2    18.7    +      -       +      +
    187J  PHE*     3.3     3.5    +      -       -      +
    189J  ARG*     1.3   105.2    +      -       -      +
    191J  LEU*     1.3    63.2    +      -       -      +
    193J  GLN*     3.3    14.3    -      -       -      +
    194J  THR*     3.1    26.0    +      -       -      +
    262J  THR*     4.0     5.7    -      -       -      +
    265J  ALA*     4.0    18.6    -      -       +      +
    266J  THR*     3.1    40.2    +      -       -      +
    269J  THR*     3.7    23.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 191 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96J  TRP*     5.9     0.2    -      -       +      -
    187J  PHE      3.0    19.7    +      -       -      +
    188J  ALA      3.8     3.8    -      -       -      +
    190J  GLU*     1.3    74.9    -      -       -      +
    192J  VAL*     1.3    64.0    +      -       -      +
    194J  THR*     2.7    23.8    +      -       -      -
    196J  CYS*     3.2    18.6    +      -       +      -
    198J  THR*     4.0    11.7    -      -       +      -
    213J  LEU*     3.7    33.0    -      -       +      +
    214J  ALA*     3.6    34.8    -      -       +      +
    217J  LEU*     3.8    14.8    -      -       +      -
    269J  THR*     3.8    21.5    -      -       +      -
    273J  VAL*     4.2    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 192 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76J  LYS*     6.2     0.4    -      -       -      +
     78J  LEU*     3.8    27.4    -      -       +      -
     79J  PRO*     3.6    33.4    -      -       +      +
     80J  PHE      5.3     1.1    -      -       -      +
     81J  TYR      5.2     0.2    -      -       -      +
     82J  GLY*     3.5    27.4    +      -       -      +
    188J  ALA      3.2    13.4    +      -       -      +
    189J  ARG*     3.7     9.6    -      -       -      +
    191J  LEU*     1.3    77.4    -      -       -      +
    193J  GLN*     1.3    64.3    +      -       -      +
    195J  GLY*     3.0    14.4    +      -       -      -
    196J  CYS      3.7    12.8    -      -       -      +
    198J  THR*     4.1    12.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 193 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61J  LYS*     3.0    43.9    +      -       +      +
     79J  PRO*     5.4     6.3    -      -       -      +
     82J  GLY*     2.9    33.6    +      -       -      +
     83J  ARG*     3.1    31.0    +      -       -      +
    189J  ARG*     3.1    27.5    +      -       +      +
    190J  GLU*     3.3    21.8    -      -       -      +
    192J  VAL*     1.3    81.6    -      -       -      +
    194J  THR*     1.3    57.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 194 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83J  ARG*     3.5    15.0    +      -       -      +
     89J  GLN*     3.4    19.4    -      -       -      +
    190J  GLU      3.1    17.3    -      -       -      +
    191J  LEU      2.7    14.4    +      -       -      +
    193J  GLN*     1.3    76.5    -      -       +      +
    195J  GLY*     1.3    56.8    +      -       -      +
    196J  CYS*     3.3    19.3    -      -       -      -
    269J  THR*     4.3    15.5    -      -       +      -
    270J  LYS*     4.5    20.4    -      -       +      +
    273J  VAL*     4.1    13.3    -      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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