Contacts of the helix formed by residues 150 - 176 (chain G) 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 G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32G  ILE*     6.0     1.4    -      -       -      +
     35G  ILE*     3.8    12.9    -      -       +      +
     89G  ARG*     2.8    27.2    +      -       -      -
     93G  LEU*     4.1    13.5    -      -       -      +
    145G  ALA*     2.9    20.5    +      -       +      +
    146G  ALA*     5.8     0.2    -      -       -      -
    148G  SER*     3.3    13.0    +      -       -      +
    149G  GLY*     1.3    72.2    -      -       -      +
    151G  ALA*     1.3    61.8    +      -       -      +
    152G  VAL      3.7     0.9    +      -       -      -
    153G  THR*     2.6    30.1    +      -       -      -
    154G  ASP*     3.0    19.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149G  GLY      2.8     9.7    +      -       -      +
    150G  ASP*     1.3    71.4    -      -       -      +
    152G  VAL*     1.3    57.5    +      -       -      +
    154G  ASP*     3.1    10.1    -      -       -      +
    155G  GLY      2.9    25.8    +      -       -      -
    142I  GLN*     3.6    38.8    -      -       +      +
    154I  ASP*     5.1     0.4    -      -       -      +
    158I  THR*     3.6    25.4    -      -       +      +
    161I  LEU*     5.0     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89G  ARG*     3.5    37.2    -      -       -      +
     92G  GLN*     4.6     2.7    -      -       -      +
    150G  ASP*     3.3     0.8    +      -       -      -
    151G  ALA*     1.3    76.3    -      -       +      +
    153G  THR*     1.3    63.8    +      -       -      +
    155G  GLY*     3.2     2.4    +      -       -      -
    156G  ILE*     3.0    36.0    +      -       +      +
    158I  THR*     4.3     7.2    -      -       +      +
    161I  LEU*     3.8    45.3    -      -       +      +
    162I  ARG*     3.8    21.8    +      -       +      +
    165I  GLY*     6.1     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 153 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35G  ILE*     4.0    21.1    -      -       +      -
     39G  LEU*     4.3     8.5    -      -       +      -
     89G  ARG*     2.9    26.5    +      -       +      +
     93G  LEU*     4.0     3.3    -      -       -      +
    141G  THR*     4.4     3.1    -      -       +      -
    145G  ALA*     4.0     9.6    -      -       +      -
    150G  ASP*     2.6    34.4    +      -       -      -
    152G  VAL*     1.3    75.6    -      -       -      +
    154G  ASP*     1.3    63.3    +      -       -      +
    156G  ILE*     4.4     5.4    -      -       -      -
    157G  ILE*     2.9    49.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151D  ALA*     5.0     0.7    -      -       -      +
    142G  GLN*     2.9    26.5    -      -       -      +
    145G  ALA*     3.8    11.4    -      -       +      +
    146G  ALA*     3.5    26.3    -      -       -      +
    150G  ASP      3.0    14.4    +      -       -      +
    151G  ALA*     3.1    14.8    -      -       -      +
    153G  THR*     1.3    77.4    -      -       -      +
    155G  GLY*     1.3    57.7    +      -       -      +
    157G  ILE*     3.9     3.8    -      -       -      +
    158G  THR*     2.8    40.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 155 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151G  ALA      2.9    14.0    +      -       -      -
    152G  VAL      3.7     1.6    -      -       -      -
    154G  ASP*     1.3    79.1    +      -       -      +
    156G  ILE*     1.3    60.8    +      -       -      +
    158G  THR*     3.4     5.6    +      -       -      -
    159G  ASP*     2.9    30.0    +      -       -      +
    158I  THR*     5.1     5.4    -      -       -      -
    162I  ARG*     3.3    17.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 156 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85G  THR*     4.1    28.3    -      -       -      +
     86G  ILE*     4.4     7.2    -      -       +      -
     89G  ARG*     3.9    28.9    -      -       +      -
     92G  GLN*     5.5     1.8    -      -       -      +
    152G  VAL*     3.0    36.1    +      -       +      +
    153G  THR      3.7     4.3    -      -       -      +
    155G  GLY*     1.3    77.9    -      -       -      +
    157G  ILE*     1.3    73.2    +      -       +      +
    159G  ASP*     3.3     3.6    +      -       -      +
    160G  ILE*     3.3    27.5    +      -       +      +
    162I  ARG*     3.6    32.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 157 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39G  LEU*     4.2    13.0    -      -       +      -
     42G  HIS*     4.9     0.9    -      -       +      -
     86G  ILE*     4.8     7.6    -      -       +      -
     89G  ARG*     6.0     0.7    -      -       +      -
    138G  PHE*     3.3    45.1    -      -       +      +
    141G  THR*     4.0    15.3    -      -       +      -
    142G  GLN*     3.6    18.4    -      -       +      -
    153G  THR*     2.9    40.3    +      -       +      +
    154G  ASP      4.0     2.0    -      -       -      +
    156G  ILE*     1.3    84.2    -      -       +      +
    158G  THR*     1.3    61.9    +      -       -      +
    160G  ILE*     3.1     9.0    +      -       -      +
    161G  LEU*     2.7    34.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 158 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151D  ALA*     3.5    43.8    -      -       +      +
    152D  VAL*     4.0     6.5    -      -       +      +
    155D  GLY*     5.1     8.3    -      -       -      -
    142G  GLN*     3.9     2.9    +      -       -      +
    154G  ASP*     2.8    37.7    +      -       -      -
    155G  GLY*     3.8     6.1    -      -       -      -
    157G  ILE*     1.3    76.4    -      -       -      +
    159G  ASP*     1.3    61.5    +      -       -      +
    161G  LEU*     3.1    10.3    +      -       -      +
    162G  ARG*     2.8    32.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 159 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155G  GLY*     2.9    18.5    +      -       -      +
    156G  ILE*     3.6     6.3    -      -       -      +
    158G  THR*     1.3    78.9    -      -       -      +
    160G  ILE*     1.3    63.3    +      -       +      +
    162G  ARG*     3.2    30.7    +      -       -      +
    163G  THR*     3.3    18.9    +      -       -      +
    162I  ARG*     3.1    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 160 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46G  LEU*     6.2     0.2    -      -       +      -
     82G  ALA*     3.7    27.4    -      -       +      -
     85G  THR*     4.3     7.6    -      -       -      +
     86G  ILE*     3.5    37.0    -      -       +      -
    138G  PHE*     3.8    30.7    -      -       +      -
    156G  ILE*     3.3    18.4    +      -       +      +
    157G  ILE*     3.1     9.8    +      -       -      +
    159G  ASP*     1.3    75.4    -      -       +      +
    161G  LEU*     1.3    66.3    +      -       -      +
    163G  THR*     3.1    13.1    +      -       -      +
    164G  LEU*     2.9    27.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 161 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151D  ALA*     5.0     5.2    -      -       +      -
    152D  VAL*     3.7    17.9    -      -       +      +
    135G  SER*     3.7    31.6    +      -       -      +
    138G  PHE*     3.3    28.7    -      -       +      -
    139G  SER*     3.9    22.4    -      -       -      +
    142G  GLN*     4.2    12.6    -      -       +      -
    157G  ILE*     2.7    30.1    +      -       +      +
    158G  THR*     3.3    13.7    -      -       -      +
    160G  ILE*     1.3    78.1    -      -       -      +
    162G  ARG*     1.3    55.8    +      -       -      +
    164G  LEU*     3.4     4.5    +      -       +      +
    165G  GLY*     2.9    26.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 162 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92D  GLN*     4.9     4.1    +      -       -      +
    152D  VAL*     3.7    25.8    +      -       +      +
    155D  GLY*     3.3    31.1    -      -       -      -
    156D  ILE*     3.5    30.7    -      -       +      +
    159D  ASP*     3.1    23.8    +      -       -      +
    158G  THR*     2.8    16.5    +      -       -      +
    159G  ASP*     3.4    25.0    +      -       -      +
    160G  ILE      3.1     0.2    -      -       -      -
    161G  LEU*     1.3    77.4    -      -       -      +
    163G  THR*     1.3    64.9    +      -       +      +
    165G  GLY*     3.3     2.6    +      -       -      -
    166G  LYS*     3.2    22.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 163 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78G  SER*     4.4    14.7    +      -       -      +
    159G  ASP      3.3    14.1    +      -       -      +
    160G  ILE*     3.1    14.8    +      -       -      +
    162G  ARG*     1.3    79.5    -      -       +      +
    164G  LEU*     1.3    67.5    +      -       -      +
    166G  LYS*     3.4     7.8    +      -       -      +
    167G  ALA*     3.1    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 164 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79G  VAL*     6.5     0.2    -      -       +      -
    131G  PHE*     3.8    44.2    -      -       +      +
    134G  LEU*     4.0     7.4    -      -       +      -
    135G  SER*     3.9    23.3    -      -       -      +
    138G  PHE*     3.5    37.5    -      -       +      -
    160G  ILE*     2.9    21.4    +      -       +      +
    161G  LEU*     3.6     8.7    -      -       +      +
    163G  THR*     1.3    78.0    +      -       -      +
    165G  GLY*     1.3    59.9    +      -       -      +
    167G  ALA*     3.2     3.8    +      -       +      +
    168G  ILE*     2.8    43.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 165 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89D  ARG*     5.1     4.3    -      -       -      -
     92D  GLN*     3.9    19.0    -      -       -      +
    152D  VAL*     6.1     0.4    -      -       -      -
    135G  SER*     5.6     1.7    +      -       -      -
    161G  LEU      2.9    16.9    +      -       -      -
    162G  ARG*     3.8     1.8    -      -       -      -
    164G  LEU*     1.3    76.9    -      -       -      +
    166G  LYS*     1.3    61.3    +      -       -      +
    168G  ILE*     3.8     8.7    -      -       -      +
    169G  TRP*     3.0    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 166 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  HIS*     5.1     2.4    +      -       -      -
     88D  GLU*     3.0    34.4    +      -       -      +
     92D  GLN*     3.6    19.6    +      -       -      +
    162G  ARG*     3.2    14.0    +      -       +      +
    163G  THR*     3.7    10.5    -      -       -      +
    164G  LEU      3.2     0.2    -      -       -      -
    165G  GLY*     1.3    75.9    -      -       -      +
    167G  ALA*     1.3    58.8    +      -       -      +
    169G  TRP*     3.3    11.0    +      -       +      +
    170G  MET*     2.9    58.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 167 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75G  TYR*     4.0    18.4    -      -       +      +
    131G  PHE*     3.8    27.6    -      -       +      -
    163G  THR      3.1    17.1    +      -       -      +
    164G  LEU*     3.7     4.0    -      -       +      +
    166G  LYS*     1.3    75.9    -      -       -      +
    168G  ILE*     1.3    60.9    +      -       -      +
    170G  MET*     3.3     9.0    +      -       -      +
    171G  LEU*     2.8    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 168 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128G  LYS*     3.7    11.3    -      -       +      +
    131G  PHE*     3.6    45.1    -      -       +      +
    132G  GLU*     3.8    34.5    -      -       +      +
    135G  SER*     4.0    15.3    -      -       -      +
    164G  LEU*     2.8    28.5    +      -       +      +
    165G  GLY*     3.8     7.6    -      -       -      +
    167G  ALA*     1.3    71.9    -      -       -      +
    169G  TRP*     1.3    58.6    +      -       -      +
    171G  LEU*     3.7     8.4    -      -       -      +
    172G  GLY*     2.9    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 169 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  TRP*     3.9    11.9    +      -       -      -
     65A  PHE*     3.9    15.9    -      +       -      -
     69A  HIS*     3.8    18.6    -      +       -      -
     88D  GLU*     3.7    31.9    -      -       +      -
     91D  LEU*     3.3    53.9    -      -       +      +
     92D  GLN*     3.7    27.4    -      -       +      -
    165G  GLY      3.0    18.1    +      -       -      +
    166G  LYS*     3.6    11.7    -      -       +      +
    168G  ILE*     1.3    78.2    -      -       -      +
    170G  MET*     1.3    89.1    +      -       +      +
    172G  GLY*     3.2     2.7    +      -       -      -
    173G  ALA*     2.9    25.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 170 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  PHE*     3.8    24.5    -      -       +      -
     66A  LYS*     5.2    17.7    -      -       +      -
     69A  HIS*     4.6    12.3    -      -       -      -
     75G  TYR*     5.2     4.7    -      -       -      +
    166G  LYS*     2.9    60.0    +      -       +      +
    167G  ALA*     3.8     7.6    -      -       -      +
    169G  TRP*     1.3    96.9    -      -       +      +
    171G  LEU*     1.3    57.3    +      -       -      +
    173G  ALA*     3.1     2.9    +      -       -      +
    174G  THR*     2.6    37.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71G  LEU*     4.6     4.9    -      -       +      -
     75G  TYR*     3.5    19.7    -      -       +      +
    124G  LEU*     3.8    40.4    -      -       +      +
    127G  VAL*     3.4    28.3    -      -       +      -
    128G  LYS*     3.6    29.6    -      -       +      -
    131G  PHE*     3.8    15.5    -      -       +      -
    167G  ALA      2.8    21.2    +      -       -      +
    168G  ILE*     3.7     3.8    -      -       -      +
    170G  MET*     1.3    75.7    -      -       -      +
    172G  GLY*     1.3    63.2    +      -       -      +
    174G  THR*     3.2     6.0    +      -       +      +
    175G  LEU*     2.9    30.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 172 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128G  LYS*     3.5    22.6    -      -       -      +
    168G  ILE      2.9    11.8    +      -       -      -
    169G  TRP*     3.2     4.7    +      -       -      -
    171G  LEU*     1.3    78.2    -      -       -      +
    173G  ALA*     1.3    55.9    +      -       -      +
    175G  LEU*     3.8     3.1    -      -       -      +
    176G  LYS*     2.9    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 173 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  ILE      4.4     6.1    -      -       -      +
     61A  TYR*     3.4    10.0    -      -       +      +
     62A  GLY      2.9    22.6    +      -       -      -
     65A  PHE*     3.7    33.2    -      -       +      -
    169G  TRP*     2.9    21.7    +      -       +      +
    170G  MET*     3.1     7.8    +      -       -      +
    172G  GLY*     1.3    79.0    -      -       -      +
    174G  THR*     1.3    60.2    +      -       -      +
    175G  LEU      3.5     0.3    +      -       -      -
    176G  LYS*     3.6     7.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 174 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  GLY      3.0    32.4    -      -       -      -
     63A  ILE*     3.2    23.0    +      -       -      +
     65A  PHE*     3.6    19.5    -      -       +      -
     66A  LYS*     4.6     7.0    -      -       +      +
     71G  LEU*     6.2     3.4    -      -       +      -
    124G  LEU*     3.8    23.8    -      -       +      +
    170G  MET*     2.6    31.4    +      -       +      +
    171G  LEU*     3.8    10.0    +      -       +      +
    173G  ALA*     1.3    77.1    -      -       -      +
    175G  LEU*     1.3    62.2    +      -       -      +
    176G  LYS      4.4     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  ILE*     6.0     0.4    -      -       +      -
    121G  VAL*     3.7    42.6    -      -       +      +
    124G  LEU*     3.8    17.0    -      -       +      +
    125G  ALA*     3.5    33.4    -      -       +      +
    128G  LYS*     4.2    15.7    -      -       +      -
    171G  LEU*     2.9    21.4    +      -       +      +
    172G  GLY*     4.1     3.6    -      -       -      +
    174G  THR*     1.3    83.2    -      -       -      +
    176G  LYS*     1.3    66.6    +      -       -      +
    177G  ALA*     3.4     5.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 176 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  HIS      5.6     0.4    +      -       -      -
     61A  TYR*     3.5    40.9    -      -       +      +
     62A  GLY*     4.1    10.7    -      -       -      -
    117A  GLU*     2.6    50.0    +      -       -      +
    172G  GLY      2.9    17.1    +      -       -      +
    173G  ALA*     3.8    10.5    -      -       -      +
    174G  THR      3.4     1.5    -      -       -      +
    175G  LEU*     1.3    78.3    -      -       -      +
    177G  ALA*     1.3    68.5    +      -       -      +
----------------------------------------------------------
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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
------------------------------------------------------------
  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