Contacts of the helix formed by residues 150 - 176 (chain F) in PDB entry 2FJC


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 ASP 150 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32F  ILE*     6.0     1.4    -      -       -      +
     35F  ILE*     3.8    12.6    -      -       +      +
     89F  ARG*     2.8    26.9    +      -       -      -
     93F  LEU*     4.0    13.3    -      -       -      +
    145F  ALA*     2.8    20.3    +      -       -      +
    148F  SER*     3.3    12.3    +      -       -      +
    149F  GLY*     1.3    72.4    -      -       -      +
    151F  ALA*     1.3    61.7    +      -       -      +
    152F  VAL*     3.6     1.2    +      -       -      +
    153F  THR*     2.6    30.0    +      -       -      -
    154F  ASP*     3.0    19.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149F  GLY      2.8     9.8    +      -       -      +
    150F  ASP*     1.3    70.9    +      -       -      +
    152F  VAL*     1.3    57.9    +      -       -      +
    154F  ASP*     3.1     9.1    -      -       -      +
    155F  GLY      2.9    25.3    +      -       -      -
    142J  GLN*     3.5    33.4    -      -       +      +
    158J  THR*     3.4    33.3    -      -       +      +
    161J  LEU*     4.6     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89F  ARG*     3.4    37.9    -      -       -      +
     92F  GLN*     4.6     2.9    -      -       -      +
    150F  ASP*     3.3     0.8    +      -       -      -
    151F  ALA*     1.3    76.5    -      -       -      +
    153F  THR*     1.3    63.9    +      -       -      +
    155F  GLY*     3.2     1.9    +      -       -      -
    156F  ILE*     2.9    35.8    +      -       +      +
    158J  THR*     4.2     6.5    -      -       -      +
    161J  LEU*     3.5    47.3    -      -       +      +
    162J  ARG*     3.5    21.6    +      -       +      +
    165J  GLY*     5.8     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 153 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35F  ILE*     4.0    18.4    -      -       +      -
     39F  LEU*     4.2     9.2    -      -       +      -
     89F  ARG*     2.8    27.5    +      -       +      +
     93F  LEU*     4.0     4.0    -      -       -      +
    141F  THR*     4.3     3.1    -      -       +      -
    145F  ALA*     4.0    12.6    -      -       +      -
    150F  ASP*     2.6    34.0    +      -       -      -
    152F  VAL*     1.3    75.8    -      -       -      +
    154F  ASP*     1.3    62.7    +      -       -      +
    156F  ILE*     3.2     5.3    +      -       -      -
    157F  ILE*     2.9    42.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142F  GLN*     2.8    31.0    -      -       -      +
    145F  ALA*     3.7    11.6    -      -       +      +
    146F  ALA*     3.6    20.1    -      -       -      +
    150F  ASP      3.0    14.8    +      -       -      +
    151F  ALA*     3.1    14.9    -      -       -      +
    153F  THR*     1.3    77.5    -      -       -      +
    155F  GLY*     1.3    55.8    +      -       -      +
    157F  ILE*     3.9     3.5    -      -       -      +
    158F  THR*     2.7    43.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 155 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151F  ALA      2.9    14.2    +      -       -      -
    152F  VAL      3.2     2.2    +      -       -      -
    154F  ASP*     1.3    76.5    -      -       -      +
    156F  ILE*     1.3    62.6    +      -       -      +
    158F  THR*     3.4     5.3    +      -       -      -
    159F  ASP*     3.0    30.4    +      -       -      +
    158J  THR*     4.8     6.5    -      -       -      -
    162J  ARG*     3.1    17.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 156 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85F  THR*     4.1    28.5    -      -       -      +
     86F  ILE*     4.4     7.4    -      -       +      -
     89F  ARG*     3.8    37.0    -      -       +      -
     92F  GLN*     5.4     2.5    -      -       -      +
    152F  VAL*     2.9    27.9    +      -       +      +
    153F  THR*     3.2     4.2    +      -       -      +
    155F  GLY*     1.3    78.2    -      -       -      +
    157F  ILE*     1.3    73.4    +      -       +      +
    159F  ASP*     3.4     3.5    +      -       -      +
    160F  ILE*     3.3    28.6    +      -       +      +
    162J  ARG*     3.9    32.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 157 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39F  LEU*     4.2    14.4    -      -       +      -
     86F  ILE*     4.8     7.6    -      -       +      -
     89F  ARG*     6.0     0.9    -      -       +      -
    138F  PHE*     3.3    46.9    -      -       +      +
    141F  THR*     4.0    14.8    -      -       +      -
    142F  GLN*     3.9    12.6    -      -       +      -
    153F  THR*     2.9    40.2    +      -       +      +
    154F  ASP      4.0     2.0    -      -       -      +
    156F  ILE*     1.3    88.3    -      -       +      +
    158F  THR*     1.3    52.7    +      -       -      +
    160F  ILE*     3.1     9.4    +      -       -      +
    161F  LEU*     2.7    44.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 158 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151B  ALA*     3.6    32.5    -      -       +      +
    152B  VAL*     4.3     4.9    -      -       -      +
    155B  GLY*     4.8    11.0    -      -       -      -
    142F  GLN*     3.9    10.4    -      -       -      +
    154F  ASP*     2.7    39.0    +      -       -      -
    155F  GLY*     3.8     5.8    -      -       -      -
    157F  ILE*     1.3    77.4    -      -       -      +
    159F  ASP*     1.3    59.4    +      -       -      +
    161F  LEU*     3.1    10.3    +      -       -      +
    162F  ARG*     2.8    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 159 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155F  GLY      3.0    17.9    +      -       -      +
    156F  ILE      3.6     5.8    -      -       -      +
    157F  ILE      3.2     0.2    -      -       -      -
    158F  THR*     1.3    76.2    -      -       -      +
    160F  ILE*     1.3    62.7    +      -       +      +
    162F  ARG*     3.2    29.6    +      -       -      +
    163F  THR*     3.3    19.3    +      -       -      +
    162J  ARG*     2.9    33.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 160 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46F  LEU*     6.2     0.2    -      -       +      -
     82F  ALA*     3.7    29.6    -      -       +      -
     85F  THR*     4.3     3.4    -      -       -      +
     86F  ILE*     3.6    36.1    -      -       +      -
    138F  PHE*     3.8    31.2    -      -       +      -
    156F  ILE*     3.3    21.3    +      -       +      +
    157F  ILE*     3.1     9.3    +      -       -      +
    159F  ASP*     1.3    74.7    -      -       +      +
    161F  LEU*     1.3    66.4    +      -       -      +
    163F  THR*     3.0    12.7    +      -       -      +
    164F  LEU*     2.9    26.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 161 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151B  ALA*     4.7     7.2    -      -       +      -
    152B  VAL*     3.7    21.4    -      -       +      +
    135F  SER*     3.6    30.7    +      -       -      +
    138F  PHE*     3.3    29.4    -      -       +      -
    139F  SER*     4.1    22.4    -      -       -      +
    142F  GLN*     4.1    14.4    -      -       +      -
    157F  ILE*     2.7    33.9    +      -       +      +
    158F  THR*     3.3    11.9    -      -       -      +
    160F  ILE*     1.3    74.4    -      -       -      +
    162F  ARG*     1.3    56.6    +      -       -      +
    164F  LEU*     3.6     4.0    -      -       +      +
    165F  GLY*     2.9    25.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 162 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92B  GLN*     5.2     2.3    +      -       -      +
    152B  VAL*     3.8    24.7    +      -       +      +
    155B  GLY*     3.2    25.9    -      -       -      -
    156B  ILE*     4.0    29.7    -      -       +      +
    159B  ASP*     2.9    30.9    +      -       -      +
    158F  THR*     2.8    17.9    +      -       +      +
    159F  ASP*     3.4    24.6    +      -       -      +
    160F  ILE      3.1     0.2    -      -       -      -
    161F  LEU*     1.3    76.8    -      -       -      +
    163F  THR*     1.3    64.2    +      -       +      +
    165F  GLY*     3.4     2.1    +      -       -      -
    166F  LYS*     3.2    24.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 163 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78F  SER*     4.5    14.5    +      -       -      +
    159F  ASP      3.3    13.9    +      -       -      +
    160F  ILE*     3.0    15.8    +      -       -      +
    162F  ARG*     1.3    78.6    -      -       +      +
    164F  LEU*     1.3    66.2    +      -       -      +
    166F  LYS*     3.4     8.1    +      -       -      +
    167F  ALA*     3.1    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 164 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131F  PHE*     3.8    46.0    -      -       +      +
    134F  LEU*     4.0     7.4    -      -       +      -
    135F  SER*     3.9    23.3    -      -       -      +
    138F  PHE*     3.5    37.2    -      -       +      -
    160F  ILE*     2.9    23.2    +      -       +      +
    161F  LEU*     3.6     8.5    -      -       +      +
    163F  THR*     1.3    79.8    +      -       -      +
    165F  GLY*     1.3    58.9    +      -       -      +
    167F  ALA*     3.2     4.5    +      -       +      +
    168F  ILE*     2.8    41.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 165 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89B  ARG*     5.1     4.9    -      -       -      -
     92B  GLN*     3.8    19.7    -      -       -      +
    152B  VAL*     5.8     0.9    -      -       -      -
    135F  SER*     5.6     2.2    +      -       -      -
    161F  LEU      2.9    16.7    +      -       -      -
    162F  ARG*     3.8     2.0    -      -       -      -
    164F  LEU*     1.3    78.2    -      -       -      +
    166F  LYS*     1.3    60.7    +      -       -      +
    168F  ILE*     3.8     9.4    -      -       -      +
    169F  TRP*     3.0    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 166 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  GLU*     3.8    24.3    +      -       +      +
     92B  GLN*     3.7    18.9    +      -       -      +
     69C  HIS*     5.1     4.4    +      -       -      -
    162F  ARG*     3.2    14.2    +      -       +      +
    163F  THR*     3.7    11.2    -      -       -      +
    164F  LEU      3.2     0.2    -      -       -      -
    165F  GLY*     1.3    75.2    -      -       -      +
    167F  ALA*     1.3    57.2    +      -       -      +
    169F  TRP*     3.3    12.2    +      -       +      +
    170F  MET*     3.0    58.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 167 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75F  TYR*     4.0    18.6    -      -       +      +
    131F  PHE*     3.8    26.2    -      -       +      -
    163F  THR      3.1    16.4    +      -       -      +
    164F  LEU*     3.7     5.4    -      -       +      +
    166F  LYS*     1.3    74.7    -      -       -      +
    168F  ILE*     1.3    59.8    +      -       -      +
    170F  MET*     3.3     8.6    +      -       -      +
    171F  LEU*     2.8    35.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 168 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128F  LYS*     3.7    12.1    -      -       -      +
    131F  PHE*     3.6    45.5    -      -       +      +
    132F  GLU*     3.7    33.4    -      -       +      +
    135F  SER*     4.0    15.0    -      -       -      +
    164F  LEU*     2.8    28.7    +      -       +      +
    165F  GLY*     3.8     7.4    -      -       -      +
    167F  ALA*     1.3    71.5    -      -       -      +
    169F  TRP*     1.3    60.0    +      -       -      +
    171F  LEU*     3.4     6.0    +      -       -      +
    172F  GLY*     2.9    26.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 169 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  GLU*     3.5    27.1    -      -       +      -
     91B  LEU*     3.6    50.0    -      -       +      +
     92B  GLN*     3.4    35.7    -      -       +      -
     58C  TRP      4.1     7.6    +      -       -      -
     65C  PHE*     3.7    20.4    -      +       -      -
     69C  HIS*     3.5    30.5    -      +       -      -
    165F  GLY      3.0     9.6    +      -       -      +
    166F  LYS*     3.6    13.7    -      -       +      +
    168F  ILE*     1.3    78.7    -      -       -      +
    170F  MET*     1.3    82.8    +      -       +      +
    172F  GLY*     3.2     2.9    +      -       -      -
    173F  ALA*     2.9    31.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 170 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  PHE*     3.8    22.9    -      -       +      -
     66C  LYS*     4.9    24.7    -      -       +      -
     69C  HIS*     4.7    12.1    -      -       -      -
     70C  GLU*     5.9     0.4    -      -       -      +
     75F  TYR*     5.2     4.0    -      -       -      +
    166F  LYS*     3.0    56.8    +      -       +      +
    167F  ALA*     3.3     8.5    +      -       -      +
    169F  TRP*     1.3    95.6    -      -       +      +
    171F  LEU*     1.3    56.0    +      -       -      +
    173F  ALA*     3.1     3.8    +      -       -      +
    174F  THR*     2.6    37.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71F  LEU*     4.6     5.2    -      -       +      -
     75F  TYR*     3.5    19.7    -      -       +      +
    124F  LEU*     3.8    41.3    -      -       +      -
    127F  VAL*     3.3    27.6    -      -       +      -
    128F  LYS*     3.7    29.6    -      -       +      +
    131F  PHE*     3.8    14.6    -      -       +      -
    167F  ALA      2.8    21.2    +      -       -      +
    168F  ILE*     3.8     3.6    -      -       -      +
    170F  MET*     1.3    75.9    -      -       -      +
    172F  GLY*     1.3    63.6    +      -       -      +
    174F  THR*     3.2     6.8    +      -       +      +
    175F  LEU*     2.9    30.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 172 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128F  LYS*     3.5    22.8    -      -       -      +
    168F  ILE      2.9    11.8    +      -       -      -
    169F  TRP      3.2     4.2    +      -       -      -
    171F  LEU*     1.3    77.0    -      -       -      +
    173F  ALA*     1.3    56.3    +      -       -      +
    175F  LEU*     3.8     3.1    -      -       -      +
    176F  LYS*     2.9    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 173 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60C  ILE      4.4     4.7    -      -       -      +
     61C  TYR*     3.4     9.1    -      -       +      +
     62C  GLY      2.9    23.1    +      -       -      -
     65C  PHE*     3.6    35.9    -      -       +      -
    169F  TRP*     2.9    21.0    +      -       +      +
    170F  MET      3.5     8.1    -      -       -      +
    172F  GLY*     1.3    79.0    -      -       -      +
    174F  THR*     1.3    60.0    +      -       -      +
    175F  LEU      3.5     0.2    +      -       -      -
    176F  LYS*     3.6     7.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 174 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62C  GLY*     3.0    15.6    -      -       -      -
     63C  ILE*     3.2    39.6    +      -       -      +
     65C  PHE*     3.7    18.2    -      -       +      -
     66C  LYS*     4.6     7.6    -      -       +      +
     71F  LEU*     6.2     3.6    -      -       +      -
    124F  LEU*     3.9    23.2    -      -       +      +
    170F  MET*     2.6    32.1    +      -       +      +
    171F  LEU*     3.2    10.3    +      -       +      -
    173F  ALA*     1.3    75.9    -      -       -      +
    175F  LEU*     1.3    62.4    +      -       -      +
    176F  LYS      4.4     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63C  ILE*     6.0     0.7    -      -       +      -
    121F  VAL*     3.7    41.3    -      -       +      +
    124F  LEU*     3.8    18.6    -      -       +      +
    125F  ALA*     3.5    33.7    -      -       +      +
    128F  LYS*     4.1    16.2    -      -       +      -
    171F  LEU*     2.9    21.0    +      -       +      +
    172F  GLY*     4.1     3.4    -      -       -      +
    174F  THR*     1.3    83.4    +      -       -      +
    176F  LYS*     1.3    65.5    +      -       -      +
    177F  ALA*     3.4     5.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 176 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59C  HIS      5.4     0.4    +      -       -      -
     61C  TYR*     3.5    44.5    -      -       +      +
     62C  GLY*     4.1    11.3    -      -       -      -
    117C  GLU*     2.7    47.5    +      -       -      +
    172F  GLY      2.9    18.7    +      -       -      +
    173F  ALA*     3.7    10.3    -      -       -      +
    174F  THR      3.4     1.3    -      -       -      +
    175F  LEU*     1.3    78.9    -      -       -      +
    177F  ALA*     1.3    68.8    +      -       -      +
----------------------------------------------------------
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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