Contacts of the helix formed by residues 170 - 194 (chain K) 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 K).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164K  PHE*     3.9    17.0    -      -       -      -
    168K  GLN*     3.1    23.7    +      -       -      +
    169K  GLU*     1.3    77.2    -      -       -      +
    171K  ASP*     1.3    63.1    +      -       -      +
    172K  ILE*     2.9    12.9    +      -       -      +
    173K  ASN*     2.6    40.5    +      -       -      +
    174K  ALA*     3.1    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 171 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170K  ASN*     1.3    77.8    -      -       -      +
    172K  ILE*     1.3    63.8    +      -       +      +
    174K  ALA*     3.7     5.9    -      -       -      +
    175K  GLY      3.0    17.0    +      -       -      -
    233K  ARG      5.9     0.4    -      -       -      +
    235K  GLU      4.1     3.7    -      -       -      +
    236K  ALA*     4.0     8.1    -      -       -      +
    237K  PHE*     3.6    30.6    +      -       -      +
    240K  MET*     3.1    28.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 172 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160K  PHE*     3.7    50.0    -      -       +      -
    164K  PHE*     4.0    17.9    -      -       +      -
    170K  ASN*     2.9    11.4    +      -       +      +
    171K  ASP*     1.3    79.3    -      -       +      +
    173K  ASN*     1.3    59.2    +      -       -      +
    176K  LEU*     2.9    18.9    +      -       +      +
    229K  ILE*     2.7    32.7    -      -       +      +
    233K  ARG*     4.0    31.4    -      -       +      +
    240K  MET*     4.0     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 173 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164K  PHE*     3.2    21.3    -      -       -      -
    165K  THR      3.1    21.8    +      -       -      -
    166K  ARG*     2.7    40.9    +      -       -      +
    168K  GLN      2.6    28.8    +      -       -      +
    169K  GLU*     5.1     3.6    -      -       +      -
    170K  ASN*     2.6    21.7    +      -       -      +
    172K  ILE*     1.3    69.7    -      -       -      +
    174K  ALA*     1.3    56.5    +      -       -      +
    176K  LEU*     3.1     3.0    +      -       -      +
    177K  ASN*     2.7    47.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 174 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169K  GLU*     6.0     0.8    -      -       -      +
    170K  ASN      3.1    17.5    +      -       -      +
    171K  ASP*     3.7     9.0    -      -       -      +
    173K  ASN*     1.3    76.8    -      -       -      +
    175K  GLY*     1.3    56.6    +      -       -      +
    177K  ASN*     3.7     8.9    -      -       -      +
    178K  TYR*     2.9    30.3    +      -       -      +
    237K  PHE*     3.6    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 175 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171K  ASP      3.0    13.2    +      -       -      -
    174K  ALA*     1.3    73.1    -      -       -      +
    176K  LEU*     1.3    64.7    +      -       -      +
    178K  TYR*     3.5     1.5    +      -       -      -
    179K  GLY*     3.0    18.9    +      -       -      -
    225K  VAL*     4.4     1.0    -      -       -      +
    229K  ILE*     3.5    19.5    -      -       -      -
    237K  PHE*     3.7    12.7    -      -       -      -
    240K  MET*     4.1     9.9    -      -       -      -
    244K  LEU*     3.4    14.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 176 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156K  PHE*     3.8    23.8    -      -       +      -
    160K  PHE*     4.6     3.4    -      -       +      -
    164K  PHE*     4.5     2.5    -      -       +      -
    166K  ARG*     4.0    16.8    -      -       -      +
    172K  ILE*     2.9    28.8    +      -       +      +
    173K  ASN*     3.5    23.8    -      -       -      +
    175K  GLY*     1.3    75.0    -      -       -      +
    177K  ASN*     1.3    54.3    -      -       -      +
    179K  GLY*     3.2     1.4    +      -       -      -
    180K  TYR*     2.8    49.1    +      -       +      +
    225K  VAL*     3.9     5.7    -      -       +      +
    226K  ASP*     3.2    29.8    -      -       -      +
    229K  ILE*     3.2    26.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 177 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166K  ARG*     2.7    34.9    +      -       -      +
    169K  GLU*     5.9     4.6    +      -       -      +
    173K  ASN*     2.7    38.5    +      -       -      +
    174K  ALA*     3.7     8.0    -      -       -      +
    176K  LEU*     1.3    72.7    -      -       -      +
    178K  TYR*     1.3    63.6    +      -       -      +
    180K  TYR*     3.3     5.4    +      -       -      +
    181K  THR*     2.9    31.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 178 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70K  LYS*     6.0     1.8    -      -       -      -
    174K  ALA      2.9    18.5    +      -       -      +
    175K  GLY*     3.7     5.2    -      -       -      +
    177K  ASN*     1.3    77.5    -      -       -      +
    179K  GLY*     1.3    63.4    +      -       -      +
    181K  THR*     2.7    21.7    +      -       -      -
    182K  LEU*     3.1    40.4    +      -       +      +
    237K  PHE*     4.3    11.7    -      +       +      -
    241K  LYS*     3.4    44.7    +      -       +      +
    244K  LEU*     3.7    13.0    -      -       +      -
    245K  PHE*     3.3    24.3    -      +       -      -
     25O    T      3.0    46.6    +      +       -      -
----------------------------------------------------------
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Residues in contact with GLY 179 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175K  GLY      3.0    11.1    +      -       -      -
    176K  LEU      3.7     2.7    -      -       -      -
    178K  TYR*     1.3    78.9    -      -       -      +
    180K  TYR*     1.3    62.7    +      -       -      +
    182K  LEU*     3.1    19.4    +      -       -      +
    183K  LEU*     3.1    10.0    +      -       -      +
    225K  VAL*     3.7    26.6    -      -       -      +
    244K  LEU*     3.7    20.4    -      -       -      -
    247K  LEU*     5.2     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 180 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156K  PHE*     3.7    14.1    -      +       -      -
    166K  ARG*     3.4    35.0    -      -       -      -
    176K  LEU*     2.8    26.4    +      -       +      +
    177K  ASN*     3.6     6.1    -      -       -      +
    179K  GLY*     1.3    76.6    -      -       -      +
    181K  THR*     1.3    58.1    +      -       +      +
    183K  LEU*     3.3     4.7    +      -       +      +
    184K  LEU*     2.8    28.5    +      -       -      +
    218K  MET*     3.5    13.7    -      -       +      +
    222K  ARG*     3.5    64.7    +      -       +      +
    225K  VAL*     4.0    11.9    -      -       +      -
    226K  ASP*     2.5    33.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 181 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70K  LYS*     5.0     8.7    +      -       -      +
     72K  LEU*     5.2     0.9    -      -       -      +
    177K  ASN*     2.9    17.9    +      -       +      +
    178K  TYR*     2.7    24.9    +      -       -      -
    180K  TYR*     1.3    74.1    -      -       +      +
    182K  LEU*     1.3    65.4    +      -       -      +
    184K  LEU*     3.2    17.4    +      -       +      +
    185K  SER*     3.0    23.7    +      -       -      -
     25O    T      3.6    22.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 182 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178K  TYR*     3.1    58.3    +      -       +      +
    179K  GLY*     3.1     6.9    +      -       -      +
    181K  THR*     1.3    74.6    -      -       -      +
    183K  LEU*     1.3    61.5    +      -       -      +
    185K  SER*     2.8    21.0    +      -       -      -
    186K  ILE*     3.2    13.3    +      -       +      +
    244K  LEU*     4.2    12.6    -      -       +      +
    245K  PHE*     4.2    12.1    -      -       +      -
    247K  LEU*     4.1    20.4    -      -       +      -
    248K  PHE*     3.5    36.9    -      -       +      -
     25O    T      3.6    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 183 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179K  GLY      3.1    10.6    +      -       -      +
    180K  TYR*     3.5     8.1    -      -       +      +
    182K  LEU*     1.3    75.6    -      -       -      +
    184K  LEU*     1.3    68.7    +      -       -      +
    186K  ILE*     3.0    18.9    +      -       +      +
    187K  PHE*     3.2    25.4    +      -       +      -
    218K  MET*     3.8    20.0    -      -       +      -
    221K  PHE*     3.7    40.2    -      -       +      +
    222K  ARG*     4.1     7.0    -      -       -      +
    224K  LEU*     5.5     0.9    -      -       +      -
    225K  VAL*     3.6    23.3    -      -       +      -
    247K  LEU*     4.8    10.5    -      -       +      -
    261K  LEU*     3.9    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 184 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72K  LEU*     4.7    11.7    -      -       +      -
    180K  TYR      2.8    15.1    +      -       -      +
    181K  THR*     3.2    22.4    +      -       +      +
    183K  LEU*     1.3    76.3    -      -       -      +
    185K  SER*     1.3    57.4    +      -       -      +
    187K  PHE*     3.2     1.0    +      -       -      -
    188K  ALA*     2.8    30.0    +      -       -      +
    209K  ASN*     5.2     4.9    -      -       -      +
    211K  PHE*     4.1    29.8    -      -       +      +
    214K  ALA*     3.6    26.7    -      -       +      +
    215K  SER*     3.7    25.1    -      -       -      +
    218K  MET*     3.8    14.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 185 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71K  ARG      4.0     7.4    -      -       -      +
     72K  LEU*     3.4    26.5    -      -       -      -
    181K  THR      3.0     6.9    +      -       -      -
    182K  LEU      2.8    13.7    +      -       -      -
    183K  LEU      3.1     0.2    -      -       -      -
    184K  LEU*     1.3    74.1    -      -       -      +
    186K  ILE*     1.3    66.1    +      -       -      +
    188K  ALA*     3.7     0.9    -      -       -      +
    189K  ARG*     3.1    44.1    +      -       -      +
    248K  PHE*     5.9     0.2    -      -       -      -
     25O    T      2.9    31.6    -      -       -      +
     26O    T      5.4     0.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 186 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182K  LEU*     3.5    13.7    -      -       +      +
    183K  LEU*     3.0    16.9    +      -       +      +
    185K  SER*     1.3    84.6    +      -       -      +
    187K  PHE*     1.3    60.1    +      -       +      +
    189K  ARG*     3.6    27.5    +      -       -      +
    190K  GLU*     3.2    30.0    +      -       +      +
    247K  LEU*     6.2     0.7    -      -       +      -
    248K  PHE*     3.7    29.4    -      -       +      -
    261K  LEU*     4.1    25.8    -      -       +      -
    262K  THR*     4.5    14.6    -      -       +      +
    265K  ALA*     3.5    31.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 187 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183K  LEU*     3.2    31.5    +      -       +      +
    184K  LEU      4.0     3.8    -      -       -      +
    186K  ILE*     1.3    80.5    -      -       +      +
    188K  ALA*     1.3    67.6    +      -       -      +
    189K  ARG      3.2     0.4    -      -       -      -
    190K  GLU*     3.8     3.2    -      -       -      +
    191K  LEU*     3.0    29.0    +      -       +      +
    214K  ALA*     4.2    19.1    -      -       +      +
    217K  LEU*     4.1    15.7    -      -       +      -
    218K  MET*     3.7    22.9    -      -       +      -
    221K  PHE*     3.5    44.9    -      +       +      -
    261K  LEU*     5.8     1.3    -      -       +      -
    265K  ALA*     3.6    31.6    -      -       +      -
    268K  TYR*     4.1     9.6    -      +       -      -
    269K  THR*     3.4    21.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 188 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72K  LEU*     4.0     6.7    -      -       +      -
     73K  PRO*     3.8    18.6    -      -       +      -
    184K  LEU      2.8    18.3    +      -       -      +
    185K  SER      3.7     4.9    -      -       -      +
    187K  PHE*     1.3    77.7    -      -       -      +
    189K  ARG*     1.3    62.0    +      -       -      +
    191K  LEU*     3.4     1.7    +      -       -      +
    192K  VAL*     3.2    28.9    +      -       -      +
    198K  THR*     3.9     5.6    -      -       +      +
    211K  PHE*     3.8    24.2    -      -       +      -
    214K  ALA*     3.8    11.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 189 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41K  LEU*     3.9    26.8    -      -       +      +
     43K  GLU*     2.7    41.9    +      -       -      -
     65K  LEU*     5.0     2.1    -      -       -      +
     67K  CYS*     4.0     8.7    -      -       -      -
     71K  ARG*     3.1    42.5    +      -       -      +
     73K  PRO*     4.0     9.6    -      -       +      +
    185K  SER*     3.1    32.6    +      -       -      +
    186K  ILE*     3.6    28.7    +      -       -      +
    188K  ALA*     1.3    83.2    -      -       -      +
    190K  GLU*     1.3    66.2    +      -       +      +
    192K  VAL*     3.4     3.2    +      -       -      +
    193K  GLN*     3.1    27.6    +      -       -      +
    262K  THR*     4.5    10.9    -      -       -      +
     26O    T      4.2    10.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 190 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41K  LEU*     5.7     0.3    -      -       -      +
    186K  ILE*     3.2    20.9    +      -       +      +
    187K  PHE*     3.8     3.1    -      -       -      +
    188K  ALA      3.3     0.4    -      -       -      -
    189K  ARG*     1.3    81.3    +      -       -      +
    191K  LEU*     1.3    63.5    +      -       -      +
    193K  GLN*     3.3    28.0    +      -       -      +
    194K  THR*     3.1    25.6    +      -       -      +
    262K  THR*     4.3     5.5    -      -       -      +
    265K  ALA*     4.0    18.6    -      -       +      +
    266K  THR*     3.1    41.9    +      -       -      +
    269K  THR*     3.7    22.4    -      -       -      +
    270K  LYS*     5.8     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 191 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187K  PHE      3.0    21.0    +      -       -      +
    188K  ALA      3.8     4.3    -      -       -      +
    190K  GLU*     1.3    75.3    -      -       -      +
    192K  VAL*     1.3    65.4    +      -       -      +
    194K  THR*     2.7    23.5    +      -       -      -
    196K  CYS*     3.2    19.0    +      -       +      +
    198K  THR*     4.0    11.2    -      -       +      -
    213K  LEU*     3.7    32.1    -      -       +      +
    214K  ALA*     3.6    36.1    -      -       +      +
    217K  LEU*     3.8    14.6    -      -       +      -
    269K  THR*     3.8    20.9    -      -       +      -
    273K  VAL*     4.2    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 192 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63K  LEU*     4.6     6.9    -      -       -      +
     65K  LEU*     3.4    34.1    -      -       +      -
     73K  PRO*     3.6    22.7    -      -       +      -
    188K  ALA      3.2    17.4    +      -       -      +
    189K  ARG      3.7     3.6    -      -       -      +
    191K  LEU*     1.3    76.2    -      -       -      +
    193K  GLN*     1.3    63.3    +      -       -      +
    195K  GLY*     3.0    13.7    +      -       -      -
    196K  CYS      3.8    12.6    -      -       -      +
    197K  PHE*     5.9     0.2    -      -       -      -
    198K  THR*     4.0    14.8    -      -       +      -
     80L  PHE*     3.5    25.1    -      -       +      -
     81L  TYR*     4.5     4.9    -      -       -      +
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Residues in contact with GLN 193 (chain K). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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      5K  THR*     3.2    31.6    +      -       -      +
      7K  VAL*     5.5     1.4    -      -       -      +
     39K  VAL*     4.2    17.1    -      -       +      +
     41K  LEU*     3.5    26.1    -      -       +      +
     63K  LEU*     3.9    15.4    -      -       -      +
     65K  LEU*     3.9    22.2    -      -       +      -
     84K  HIS*     5.4     1.4    -      -       -      -
     86K  SER*     4.4     3.1    -      -       -      -
    189K  ARG*     3.1    13.1    +      -       -      +
    190K  GLU*     3.3    41.1    +      -       -      +
    191K  LEU      3.1     0.4    -      -       -      -
    192K  VAL*     1.3    78.5    -      -       -      +
    194K  THR*     1.3    60.7    +      -       +      +
    195K  GLY      3.5     0.2    +      -       -      -
    266K  THR*     5.4     3.8    -      -       -      +
    270K  LYS*     6.0     1.4    -      -       -      -
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Residues in contact with THR 194 (chain K). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     86K  SER*     4.3     7.8    -      -       -      +
     89K  GLN*     3.4    19.1    -      -       -      +
    190K  GLU      3.1    17.5    -      -       -      +
    191K  LEU*     2.7    15.9    +      -       -      -
    193K  GLN*     1.3    77.7    -      -       +      +
    195K  GLY*     1.3    56.4    +      -       -      +
    196K  CYS*     3.4    19.9    -      -       -      -
    269K  THR*     4.3    15.0    -      -       +      -
    270K  LYS*     4.4    22.7    -      -       +      -
    273K  VAL*     4.1    14.5    -      -       +      +
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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
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  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) +   -    +    +   +   +    +    -
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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