Contacts of the helix formed by residues 170 - 194 (chain I) 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 I).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164I  PHE*     3.8    13.7    -      -       -      -
    168I  GLN*     3.2    24.6    +      -       -      +
    169I  GLU*     1.3    75.9    -      -       -      +
    171I  ASP*     1.3    63.8    +      -       -      +
    172I  ILE*     2.9    13.3    +      -       +      +
    173I  ASN*     2.6    50.0    +      -       -      +
    174I  ALA*     3.1    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 171 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170I  ASN*     1.3    75.1    -      -       -      +
    172I  ILE*     1.3    62.9    +      -       +      +
    174I  ALA*     3.7     6.9    -      -       -      +
    175I  GLY      3.1    11.6    +      -       -      -
    233I  ARG      5.9     0.2    -      -       -      +
    235I  GLU      4.1     2.7    -      -       -      +
    236I  ALA*     4.0     8.0    -      -       -      +
    237I  PHE*     3.6    29.3    +      -       -      +
    240I  MET*     3.0    35.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 172 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160I  PHE*     3.7    47.1    -      -       +      -
    164I  PHE*     4.0    18.4    -      -       +      -
    170I  ASN*     2.9    10.6    +      -       +      +
    171I  ASP*     1.3    78.6    -      -       +      +
    173I  ASN*     1.3    59.0    +      -       -      +
    175I  GLY*     3.4     1.9    +      -       -      -
    176I  LEU*     3.0    34.3    +      -       +      +
    229I  ILE*     3.9     9.4    -      -       +      +
    233I  ARG*     4.0    31.0    -      -       +      +
    240I  MET*     4.0     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 173 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164I  PHE*     3.2    22.1    -      -       -      -
    166I  ARG*     2.7    47.7    +      -       -      +
    167I  GLU      5.2     0.2    -      -       -      -
    168I  GLN      2.7    40.0    +      -       -      +
    170I  ASN*     2.6    26.8    +      -       -      +
    172I  ILE*     1.3    71.9    -      -       -      +
    174I  ALA*     1.3    55.9    +      -       -      +
    176I  LEU*     3.1     3.3    +      -       -      +
    177I  ASN*     2.8    47.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 174 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170I  ASN      3.1    17.1    +      -       -      +
    171I  ASP*     3.7     9.4    -      -       -      +
    173I  ASN*     1.3    76.6    -      -       -      +
    175I  GLY*     1.3    55.3    +      -       -      +
    177I  ASN*     3.7     9.1    -      -       -      +
    178I  TYR*     2.9    30.1    +      -       -      +
    237I  PHE*     3.6    23.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 175 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171I  ASP      3.1    15.0    +      -       -      -
    172I  ILE      3.7     3.8    -      -       -      -
    174I  ALA*     1.3    73.1    -      -       -      +
    176I  LEU*     1.3    65.8    +      -       -      +
    178I  TYR*     3.5     1.5    +      -       -      +
    179I  GLY      3.0    18.0    +      -       -      -
    229I  ILE*     3.4    27.1    -      -       -      +
    237I  PHE*     3.7    13.0    -      -       -      -
    240I  MET*     4.1     7.2    -      -       -      -
    244I  LEU*     3.4     4.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 176 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156I  PHE*     3.8    23.3    -      -       +      -
    160I  PHE*     4.7     3.6    -      -       +      -
    164I  PHE*     4.5     2.0    -      -       +      -
    166I  ARG*     4.0    17.3    -      -       -      +
    172I  ILE*     3.0    28.5    +      -       +      +
    173I  ASN*     3.1    23.5    +      -       -      +
    175I  GLY*     1.3    76.8    -      -       -      +
    177I  ASN*     1.3    57.0    +      -       -      +
    179I  GLY*     3.2     2.1    +      -       -      -
    180I  TYR*     2.8    44.4    +      -       +      +
    225I  VAL*     3.9     8.4    -      -       +      +
    226I  ASP*     3.2    39.7    -      -       +      +
    229I  ILE*     3.9    13.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 177 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166I  ARG*     2.7    33.4    +      -       -      +
    173I  ASN*     2.8    34.1    +      -       -      +
    174I  ALA*     3.7     7.2    -      -       -      +
    176I  LEU*     1.3    75.6    -      -       -      +
    178I  TYR*     1.3    61.9    +      -       -      +
    180I  TYR*     3.3     8.2    +      -       -      +
    181I  THR*     2.9    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 178 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174I  ALA      2.9    18.3    +      -       -      +
    175I  GLY*     3.7     5.2    -      -       -      +
    176I  LEU      3.3     0.2    -      -       -      -
    177I  ASN*     1.3    77.1    -      -       -      +
    179I  GLY*     1.3    63.4    +      -       -      +
    181I  THR*     2.7    22.7    +      -       -      -
    182I  LEU*     3.1    33.1    +      -       +      +
    237I  PHE*     4.3    11.0    -      +       +      -
    241I  LYS*     3.5    47.0    +      -       +      +
    244I  LEU*     3.7    14.4    -      -       +      -
    245I  PHE*     3.2    26.2    -      +       -      -
     25P    T      3.5    46.5    +      +       +      -
----------------------------------------------------------
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Residues in contact with GLY 179 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175I  GLY      3.0    10.5    +      -       -      -
    176I  LEU      3.7     2.2    -      -       -      -
    178I  TYR*     1.3    78.1    -      -       -      +
    180I  TYR*     1.3    63.1    +      -       -      +
    182I  LEU*     3.1    18.6    +      -       -      +
    183I  LEU*     3.2    10.0    +      -       -      +
    225I  VAL*     3.7    27.3    -      -       -      +
    244I  LEU*     3.6    20.2    -      -       -      -
    247I  LEU*     4.8     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 180 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156I  PHE*     3.7    13.9    -      +       -      -
    166I  ARG*     3.3    34.1    -      -       -      -
    176I  LEU*     2.8    26.4    +      -       +      +
    177I  ASN*     3.6     6.3    -      -       -      +
    179I  GLY*     1.3    77.7    -      -       -      +
    181I  THR*     1.3    56.7    +      -       +      +
    183I  LEU*     3.4     4.7    +      -       -      +
    184I  LEU*     2.9    27.8    +      -       -      +
    218I  MET*     3.5    14.7    -      -       +      +
    222I  ARG*     3.4    64.4    +      -       +      +
    225I  VAL*     4.0    12.8    -      -       +      -
    226I  ASP*     2.5    33.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 181 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72I  LEU*     5.4     0.5    -      -       -      +
    177I  ASN*     2.9    18.3    +      -       +      +
    178I  TYR*     2.7    25.6    +      -       -      -
    180I  TYR*     1.3    75.0    -      -       +      +
    182I  LEU*     1.3    66.6    +      -       -      +
    184I  LEU*     3.2    25.2    +      -       +      +
    185I  SER*     3.2    12.8    +      -       -      -
     25P    T      4.1    22.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 182 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178I  TYR*     3.1    40.3    +      -       +      +
    179I  GLY*     3.1    12.3    +      -       -      +
    181I  THR*     1.3    76.8    -      -       -      +
    183I  LEU*     1.3    63.3    +      -       -      +
    185I  SER*     2.9    25.3    +      -       -      -
    186I  ILE*     3.4    11.8    +      -       +      +
    244I  LEU*     4.4    11.4    -      -       +      +
    245I  PHE*     4.4     8.7    -      -       +      -
    247I  LEU*     4.4    16.2    -      -       +      -
    248I  PHE*     4.1    29.1    -      -       +      -
     25P    T      3.4    41.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 183 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179I  GLY      3.2     8.8    +      -       -      +
    180I  TYR*     3.5     8.5    -      -       +      +
    181I  THR      3.3     0.2    -      -       -      -
    182I  LEU*     1.3    76.8    -      -       -      +
    184I  LEU*     1.3    69.7    +      -       -      +
    185I  SER      3.1     0.5    +      -       -      -
    186I  ILE*     3.1    17.6    +      -       +      +
    187I  PHE*     3.2    25.3    -      -       +      -
    218I  MET*     3.8    20.2    -      -       +      -
    221I  PHE*     3.7    40.2    -      -       +      +
    222I  ARG*     4.1     6.3    -      -       -      -
    224I  LEU*     5.4     0.9    -      -       +      -
    225I  VAL*     3.7    24.0    -      -       +      -
    247I  LEU*     4.8    10.5    -      -       +      -
    261I  LEU*     3.9    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 184 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72I  LEU*     4.8     7.9    -      -       +      -
    180I  TYR      2.9    14.0    +      -       -      +
    181I  THR*     3.3    23.1    -      -       +      +
    183I  LEU*     1.3    78.2    -      -       -      +
    185I  SER*     1.3    57.7    +      -       -      +
    187I  PHE*     3.2     1.5    +      -       -      -
    188I  ALA*     2.9    27.5    +      -       -      +
    209I  ASN*     5.2     4.7    -      -       -      +
    211I  PHE*     4.0    31.4    -      -       +      +
    214I  ALA*     3.6    27.1    -      -       +      +
    215I  SER*     3.6    26.0    -      -       -      +
    218I  MET*     3.8    14.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 185 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70I  LYS      3.6    19.8    +      -       -      -
     71I  ARG*     4.1     7.6    -      -       -      +
     72I  LEU*     3.3    28.0    -      -       -      -
    181I  THR      3.2     6.2    +      -       -      -
    182I  LEU*     2.9    20.8    +      -       -      -
    183I  LEU      3.1     0.8    -      -       -      -
    184I  LEU*     1.3    77.8    -      -       -      +
    186I  ILE*     1.3    68.9    +      -       -      +
    188I  ALA*     3.7     0.9    -      -       -      +
    189I  ARG*     3.1    35.7    +      -       -      +
    248I  PHE*     5.7     1.9    -      -       -      -
     25P    T      4.4     6.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 186 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182I  LEU*     3.5    15.3    -      -       +      +
    183I  LEU*     3.1    16.1    +      -       +      +
    185I  SER*     1.3    84.1    -      -       -      +
    187I  PHE*     1.3    62.3    +      -       +      +
    189I  ARG*     3.6    28.1    -      -       -      +
    190I  GLU*     3.5    19.2    +      -       -      +
    248I  PHE*     3.7    29.8    -      -       +      -
    261I  LEU*     4.1    26.0    -      -       +      +
    262I  THR*     4.4    14.6    -      -       +      +
    265I  ALA*     3.4    30.0    -      -       +      +
    266I  THR*     6.2     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 187 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183I  LEU*     3.2    29.3    +      -       +      -
    184I  LEU      3.2     5.7    +      -       -      +
    185I  SER      3.2     0.4    -      -       -      -
    186I  ILE*     1.3    78.5    -      -       +      +
    188I  ALA*     1.3    67.1    +      -       -      +
    189I  ARG      3.2     1.6    -      -       -      -
    190I  GLU*     3.8     4.2    -      -       -      +
    191I  LEU*     3.1    28.6    +      -       +      +
    214I  ALA*     4.2    19.5    -      -       +      +
    217I  LEU*     4.1    15.5    -      -       +      -
    218I  MET*     3.7    22.7    -      -       +      -
    221I  PHE*     3.5    44.6    -      +       +      -
    261I  LEU*     5.9     1.6    -      -       +      -
    265I  ALA*     3.6    33.7    -      -       +      -
    268I  TYR*     4.1    10.1    -      +       -      -
    269I  THR*     3.4    20.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 188 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72I  LEU*     4.0     6.3    -      -       +      -
     73I  PRO*     3.9    14.1    -      -       +      -
    184I  LEU      2.9    17.6    +      -       -      +
    185I  SER      3.7     5.2    -      -       -      +
    187I  PHE*     1.3    79.1    -      -       -      +
    189I  ARG*     1.3    61.5    -      -       -      +
    191I  LEU*     3.7     1.4    -      -       -      +
    192I  VAL*     3.2    28.6    +      -       -      +
    198I  THR*     3.9     5.3    -      -       +      +
    211I  PHE*     3.8    29.2    -      -       +      -
    214I  ALA*     3.8    11.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 189 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41I  LEU*     3.9    21.2    -      -       +      +
     43I  GLU*     2.7    43.3    +      -       -      -
     65I  LEU*     5.0     1.7    -      -       -      +
     67I  CYS*     4.0    14.8    -      -       -      -
     71I  ARG*     3.1    45.4    +      -       -      +
     73I  PRO*     4.0     9.6    -      -       +      +
    185I  SER*     3.1    26.9    +      -       -      +
    186I  ILE*     3.6    29.2    +      -       -      +
    188I  ALA*     1.3    81.3    -      -       -      +
    190I  GLU*     1.3    62.2    +      -       -      +
    191I  LEU      3.3     0.3    +      -       -      -
    192I  VAL*     3.4     3.5    +      -       -      +
    193I  GLN*     3.1    24.8    +      -       -      +
    262I  THR*     4.2    17.2    -      -       -      +
     26P    T      4.6     5.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 190 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186I  ILE      3.5     9.9    +      -       -      +
    187I  PHE*     3.4     5.4    +      -       -      +
    188I  ALA      3.4     0.2    -      -       -      -
    189I  ARG*     1.3    80.7    -      -       -      +
    191I  LEU*     1.3    64.1    +      -       -      +
    193I  GLN*     3.3    34.8    +      -       -      +
    194I  THR*     3.1    23.2    -      -       -      +
    265I  ALA      4.0     2.2    -      -       -      +
    266I  THR*     3.3    59.2    -      -       +      +
    269I  THR*     3.8    20.4    -      -       -      +
    270I  LYS*     4.8     3.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 191 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96I  TRP*     5.8     0.2    -      -       +      -
    187I  PHE      3.1    21.1    +      -       -      +
    188I  ALA      3.7     3.8    -      -       -      +
    189I  ARG      3.2     0.2    -      -       -      -
    190I  GLU*     1.3    79.0    -      -       -      +
    192I  VAL*     1.3    62.7    +      -       -      +
    194I  THR*     2.7    23.9    +      -       -      -
    196I  CYS*     3.2    19.4    +      -       +      +
    198I  THR*     4.0    11.4    -      -       +      -
    213I  LEU*     3.7    33.4    -      -       +      +
    214I  ALA*     3.6    34.5    -      -       +      +
    217I  LEU*     3.9    15.0    -      -       +      -
    269I  THR*     3.8    20.0    -      -       +      -
    273I  VAL*     4.1    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 192 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63I  LEU*     4.6     5.5    -      -       -      +
     65I  LEU*     3.4    33.7    -      -       +      +
     73I  PRO*     3.6    23.1    -      -       +      -
    188I  ALA      3.2    13.4    +      -       -      +
    189I  ARG      3.7     7.2    -      -       -      +
    191I  LEU*     1.3    76.3    -      -       -      +
    193I  GLN*     1.3    62.7    +      -       -      +
    195I  GLY*     3.0    14.2    +      -       -      -
    196I  CYS      3.8    12.7    -      -       -      +
    198I  THR*     4.0    15.0    -      -       +      +
     80J  PHE*     3.4    24.7    -      -       +      -
     81J  TYR*     4.3     6.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 193 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5I  THR*     3.2    32.4    +      -       -      +
      7I  VAL*     5.4     1.8    -      -       -      +
     39I  VAL*     4.2    17.4    -      -       +      +
     41I  LEU*     3.4    26.0    -      -       +      +
     63I  LEU*     3.9    16.2    -      -       -      +
     65I  LEU*     3.9    22.4    -      -       +      +
     84I  HIS*     5.4     1.2    -      -       -      -
     86I  SER*     4.5     2.4    -      -       -      -
    189I  ARG*     3.1    13.4    +      -       -      +
    190I  GLU*     3.3    40.6    +      -       -      +
    192I  VAL*     1.3    78.4    -      -       -      +
    194I  THR*     1.3    61.2    +      -       +      +
    195I  GLY      3.5     0.3    +      -       -      -
    266I  THR*     5.3     2.2    -      -       -      +
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Residues in contact with THR 194 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86I  SER*     4.4     6.9    -      -       -      +
     89I  GLN*     3.4    19.6    -      -       -      +
    190I  GLU*     3.1    26.2    -      -       -      +
    191I  LEU*     2.7    18.6    +      -       -      +
    193I  GLN*     1.3    77.6    -      -       +      +
    195I  GLY*     1.3    56.4    +      -       -      +
    196I  CYS*     3.3    19.4    -      -       -      -
    269I  THR*     4.5    10.5    -      -       +      -
    270I  LYS*     4.6    14.4    -      -       +      -
    273I  VAL*     4.1    16.8    -      -       +      +
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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