Contacts of the helix formed by residues 150 - 176 (chain E) 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 E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32E  ILE*     6.0     1.4    -      -       -      +
     35E  ILE*     3.8    18.3    -      -       +      +
     89E  ARG*     2.9    27.1    +      -       -      -
     93E  LEU*     4.0    12.6    -      -       -      +
    145E  ALA*     2.8    14.5    +      -       +      +
    148E  SER*     3.3    13.1    +      -       -      +
    149E  GLY*     1.3    73.4    -      -       -      +
    151E  ALA*     1.3    59.3    +      -       -      +
    152E  VAL*     3.6     1.4    +      -       -      +
    153E  THR*     2.6    31.5    +      -       -      -
    154E  ASP*     3.0    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149E  GLY      2.8    10.6    +      -       -      +
    150E  ASP*     1.3    70.4    +      -       -      +
    152E  VAL*     1.3    57.3    +      -       -      +
    154E  ASP*     3.1     9.7    -      -       -      +
    155E  GLY      2.9    25.3    +      -       -      -
    142L  GLN*     3.5    41.7    -      -       +      +
    154L  ASP*     5.1     0.2    -      -       -      +
    158L  THR*     3.6    22.2    -      -       +      +
    161L  LEU*     5.0     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89E  ARG*     3.4    36.3    -      -       -      +
     92E  GLN*     4.6     2.5    -      -       -      +
    150E  ASP*     3.3     1.0    +      -       -      -
    151E  ALA*     1.3    76.1    -      -       -      +
    153E  THR*     1.3    63.7    +      -       -      +
    155E  GLY*     3.2     2.3    +      -       -      -
    156E  ILE*     2.9    37.1    +      -       +      +
    158L  THR*     4.3     7.0    -      -       +      +
    161L  LEU*     3.8    44.4    -      -       +      +
    162L  ARG*     3.9    20.1    +      -       +      +
    165L  GLY*     6.1     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 153 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35E  ILE*     4.0    21.5    -      -       +      -
     39E  LEU*     4.3     9.0    -      -       +      -
     89E  ARG*     2.8    26.3    +      -       +      +
     93E  LEU*     4.0     3.8    -      -       -      +
    141E  THR*     4.4     3.1    -      -       +      -
    145E  ALA*     4.0     9.9    -      -       +      -
    150E  ASP*     2.6    33.8    +      -       -      -
    152E  VAL*     1.3    77.1    -      -       -      +
    154E  ASP*     1.3    63.9    +      -       -      +
    156E  ILE*     3.3     5.7    +      -       -      -
    157E  ILE*     2.9    42.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142E  GLN*     2.9    26.8    -      -       -      +
    145E  ALA*     3.8    11.4    -      -       +      +
    146E  ALA*     3.5    25.8    -      -       -      +
    150E  ASP      3.0    14.4    +      -       -      +
    151E  ALA*     3.1    15.2    -      -       -      +
    153E  THR*     1.3    77.2    -      -       -      +
    155E  GLY*     1.3    58.3    +      -       -      +
    157E  ILE*     3.9     3.2    -      -       -      +
    158E  THR*     2.8    40.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 155 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151E  ALA      2.9    14.2    +      -       -      -
    152E  VAL      3.7     2.0    -      -       -      -
    154E  ASP*     1.3    77.4    +      -       -      +
    156E  ILE*     1.3    61.7    +      -       -      +
    158E  THR*     3.8     5.0    -      -       -      -
    159E  ASP*     3.0    30.4    +      -       -      +
    158L  THR*     5.0     6.7    -      -       -      -
    162L  ARG*     3.3    16.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 156 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85E  THR*     4.0    29.4    -      -       -      +
     86E  ILE*     4.4     6.7    -      -       +      -
     89E  ARG*     3.9    37.5    -      -       +      -
     92E  GLN*     5.5     2.5    -      -       -      +
    152E  VAL*     2.9    27.3    +      -       +      +
    153E  THR      3.3     5.4    +      -       -      +
    155E  GLY*     1.3    78.1    -      -       -      +
    157E  ILE*     1.3    72.2    +      -       +      +
    159E  ASP*     3.3     3.3    +      -       -      +
    160E  ILE*     3.3    27.7    +      -       +      +
    162L  ARG*     3.9    33.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 157 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39E  LEU*     4.3    13.7    -      -       +      -
     42E  HIS*     4.9     0.7    -      -       +      -
     86E  ILE*     4.8     7.6    -      -       +      -
     89E  ARG*     6.0     0.9    -      -       +      -
    138E  PHE*     3.3    47.1    -      -       +      +
    141E  THR*     4.1    14.4    -      -       +      -
    142E  GLN*     3.6    12.8    -      -       +      -
    153E  THR*     2.9    40.4    +      -       +      +
    154E  ASP      4.0     1.8    -      -       -      +
    156E  ILE*     1.3    86.1    -      -       +      +
    158E  THR*     1.3    61.4    +      -       -      +
    160E  ILE*     3.0     9.7    +      -       -      +
    161E  LEU*     2.7    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 158 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151C  ALA*     3.5    43.2    -      -       +      +
    152C  VAL*     4.1     4.9    -      -       -      +
    155C  GLY*     4.9     9.9    -      -       -      -
    142E  GLN*     3.9     2.6    +      -       -      +
    154E  ASP*     2.8    38.1    +      -       -      -
    155E  GLY*     3.8     5.4    -      -       -      -
    157E  ILE*     1.3    77.1    -      -       -      +
    159E  ASP*     1.3    59.8    +      -       -      +
    161E  LEU*     3.1    11.5    +      -       -      +
    162E  ARG*     2.8    32.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 159 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155E  GLY*     3.0    18.1    +      -       -      +
    156E  ILE*     3.6     5.8    -      -       -      +
    157E  ILE      3.2     0.2    -      -       -      -
    158E  THR*     1.3    77.8    -      -       -      +
    160E  ILE*     1.3    64.3    +      -       +      +
    162E  ARG*     3.3    28.8    +      -       -      +
    163E  THR*     3.3    20.0    +      -       -      +
    162L  ARG*     3.1    33.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 160 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82E  ALA*     3.8    25.1    -      -       +      -
     85E  THR*     4.3     4.9    -      -       -      +
     86E  ILE*     3.5    36.8    -      -       +      -
    138E  PHE*     3.9    29.8    -      -       +      -
    156E  ILE*     3.5    22.4    -      -       +      +
    157E  ILE*     3.0     9.5    +      -       -      +
    159E  ASP*     1.3    73.9    -      -       +      +
    161E  LEU*     1.3    61.1    +      -       -      +
    163E  THR*     3.1    13.2    +      -       -      +
    164E  LEU*     2.9    33.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 161 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151C  ALA*     4.9     5.6    -      -       +      -
    152C  VAL*     3.6    20.0    -      -       +      +
    135E  SER*     3.6    31.0    +      -       -      +
    138E  PHE*     3.4    28.7    -      -       +      -
    139E  SER*     4.0    22.4    -      -       -      +
    142E  GLN*     4.2    12.6    -      -       +      -
    157E  ILE*     2.7    32.1    +      -       +      +
    158E  THR*     3.3    13.2    -      -       -      +
    160E  ILE*     1.3    75.5    -      -       -      +
    162E  ARG*     1.3    58.1    +      -       -      +
    164E  LEU*     3.3     4.6    +      -       +      +
    165E  GLY*     2.9    26.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 162 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92C  GLN*     5.0     2.8    +      -       -      +
    152C  VAL*     3.6    24.8    +      -       +      +
    155C  GLY*     3.1    32.7    +      -       -      -
    156C  ILE*     3.9    30.1    -      -       +      +
    159C  ASP*     3.0    25.8    +      -       -      +
    158E  THR*     2.8    16.5    +      -       -      +
    159E  ASP*     3.4    25.0    +      -       -      +
    160E  ILE      3.1     0.2    -      -       -      -
    161E  LEU*     1.3    76.3    -      -       -      +
    163E  THR*     1.3    65.1    +      -       +      +
    165E  GLY*     3.3     2.3    +      -       -      -
    166E  LYS*     3.2    21.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 163 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78E  SER*     4.4    14.6    +      -       -      +
    159E  ASP      3.4    14.4    -      -       -      +
    160E  ILE*     3.1    15.4    +      -       -      +
    162E  ARG*     1.3    79.3    -      -       +      +
    164E  LEU*     1.3    65.9    +      -       -      +
    166E  LYS*     3.4     8.1    +      -       -      +
    167E  ALA*     3.1    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 164 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79E  VAL*     6.5     0.4    -      -       +      -
    131E  PHE*     3.8    45.1    -      -       +      +
    134E  LEU*     4.0     7.2    -      -       +      -
    135E  SER*     3.9    23.6    -      -       -      +
    138E  PHE*     3.5    37.5    -      -       +      -
    160E  ILE*     2.9    23.3    +      -       +      +
    161E  LEU*     3.6     7.6    -      -       +      +
    163E  THR*     1.3    81.7    +      -       -      +
    165E  GLY*     1.3    57.1    +      -       -      +
    167E  ALA*     3.2     3.5    +      -       -      +
    168E  ILE*     2.8    42.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 165 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89C  ARG*     5.1     4.5    -      -       -      -
     92C  GLN*     3.8    18.7    -      -       -      +
    152C  VAL*     5.9     0.9    -      -       -      -
    135E  SER*     5.7     1.3    +      -       -      -
    161E  LEU      2.9    15.9    +      -       -      -
    162E  ARG*     3.3     2.7    +      -       -      -
    163E  THR      3.3     0.2    -      -       -      -
    164E  LEU*     1.3    77.1    -      -       -      +
    166E  LYS*     1.3    60.1    -      -       -      +
    168E  ILE*     3.5     8.8    +      -       -      +
    169E  TRP*     3.0    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 166 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69B  HIS*     4.8     5.5    +      -       -      -
     88C  GLU*     3.5    27.3    +      -       +      +
     92C  GLN*     3.6    20.2    +      -       -      +
    162E  ARG*     3.2    13.0    +      -       +      +
    163E  THR*     3.8     9.4    -      -       -      +
    164E  LEU      3.2     0.2    -      -       -      -
    165E  GLY*     1.3    74.6    -      -       -      +
    167E  ALA*     1.3    58.8    +      -       -      +
    169E  TRP*     3.3    12.8    +      -       +      +
    170E  MET*     3.0    57.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 167 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75E  TYR*     4.0    19.3    -      -       +      -
    131E  PHE*     3.8    26.7    -      -       +      -
    163E  THR      3.1    17.0    +      -       -      +
    164E  LEU*     3.7     4.9    -      -       +      +
    166E  LYS*     1.3    75.3    -      -       -      +
    168E  ILE*     1.3    60.1    +      -       -      +
    170E  MET*     3.3     8.2    +      -       -      +
    171E  LEU*     2.8    37.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 168 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128E  LYS*     3.7    11.7    -      -       +      +
    131E  PHE*     3.6    44.9    -      -       +      +
    132E  GLU*     3.8    33.0    -      -       +      +
    135E  SER*     4.0    14.6    -      -       -      +
    164E  LEU*     2.8    29.1    +      -       +      +
    165E  GLY*     3.8     7.4    -      -       -      +
    167E  ALA*     1.3    71.9    -      -       -      +
    169E  TRP*     1.3    59.2    +      -       -      +
    171E  LEU*     3.4     6.4    +      -       -      +
    172E  GLY*     2.9    26.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 169 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  TRP      4.0     8.3    +      -       -      -
     65B  PHE*     3.8    18.2    -      +       -      -
     69B  HIS*     3.6    29.2    -      +       -      -
     88C  GLU*     3.7    23.1    -      -       +      -
     91C  LEU*     3.3    53.9    -      -       +      +
     92C  GLN*     3.5    26.7    -      -       +      -
    165E  GLY      3.0    19.0    +      -       -      +
    166E  LYS*     3.8    16.8    -      -       +      -
    167E  ALA      3.2     0.2    -      -       -      -
    168E  ILE*     1.3    79.7    -      -       -      +
    170E  MET*     1.3    87.1    +      -       +      +
    172E  GLY*     3.2     2.6    +      -       -      -
    173E  ALA*     2.9    25.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 170 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  PHE*     3.8    23.3    -      -       +      -
     66B  LYS*     5.0    22.4    -      -       +      -
     69B  HIS*     4.8     9.4    -      -       -      -
     75E  TYR*     5.2     4.3    -      -       -      +
    166E  LYS*     3.0    62.3    +      -       +      +
    167E  ALA*     3.8     7.9    -      -       -      +
    169E  TRP*     1.3    94.9    -      -       +      +
    171E  LEU*     1.3    56.1    +      -       -      +
    173E  ALA*     3.1     3.3    +      -       -      +
    174E  THR*     2.6    37.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71E  LEU*     4.6     5.4    -      -       +      -
     75E  TYR*     3.5    19.7    -      -       +      +
    124E  LEU*     3.9    40.8    -      -       +      -
    127E  VAL*     3.3    26.7    -      -       +      -
    128E  LYS*     3.7    28.5    -      -       +      -
    131E  PHE*     3.8    15.7    -      -       +      -
    167E  ALA      2.8    19.3    +      -       -      +
    168E  ILE*     3.7     4.0    -      -       -      +
    170E  MET*     1.3    77.5    -      -       -      +
    172E  GLY*     1.3    63.6    +      -       -      +
    174E  THR*     3.2     6.6    +      -       +      -
    175E  LEU*     2.9    30.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 172 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128E  LYS*     3.5    23.3    -      -       -      +
    168E  ILE      2.9    11.8    +      -       -      -
    169E  TRP*     3.2     4.5    +      -       -      -
    171E  LEU*     1.3    77.5    -      -       -      +
    173E  ALA*     1.3    55.8    +      -       -      +
    175E  LEU*     3.8     2.7    -      -       -      +
    176E  LYS*     2.9    31.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 173 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  TRP      6.1     0.2    -      -       -      +
     60B  ILE      4.4     4.9    -      -       -      +
     61B  TYR*     3.3     9.5    -      -       +      +
     62B  GLY      2.9    22.7    +      -       -      -
     65B  PHE*     3.6    34.8    -      -       +      -
    169E  TRP*     2.9    21.5    +      -       +      +
    170E  MET      3.1     8.5    +      -       -      +
    172E  GLY*     1.3    78.1    -      -       -      +
    174E  THR*     1.3    59.1    +      -       -      +
    176E  LYS*     3.7     7.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 174 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  GLY*     2.9    31.9    -      -       -      -
     63B  ILE*     3.2    23.5    +      -       -      +
     65B  PHE*     3.7    18.8    -      -       +      -
     66B  LYS*     4.6     7.4    -      -       +      +
     71E  LEU*     6.1     3.4    -      -       +      -
    124E  LEU*     3.8    23.3    -      -       +      +
    170E  MET*     2.6    30.9    +      -       +      +
    171E  LEU*     3.2    11.7    +      -       +      +
    173E  ALA*     1.3    76.0    -      -       -      +
    175E  LEU*     1.3    62.5    +      -       -      +
    176E  LYS      4.4     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  ILE*     5.9     0.2    -      -       +      -
    121E  VAL*     3.7    42.8    -      -       +      +
    124E  LEU*     3.8    17.7    -      -       +      +
    125E  ALA*     3.5    33.9    -      -       +      +
    128E  LYS*     4.2    15.5    -      -       +      -
    171E  LEU*     2.9    20.8    +      -       +      +
    172E  GLY*     4.1     3.1    -      -       -      +
    174E  THR*     1.3    84.4    -      -       -      +
    176E  LYS*     1.3    66.0    +      -       -      +
    177E  ALA*     3.4     6.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 176 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  HIS      5.4     0.6    +      -       -      -
     61B  TYR*     3.4    42.9    -      -       +      +
     62B  GLY*     4.0    11.1    +      -       -      -
    117B  GLU*     2.7    51.7    +      -       -      +
    172E  GLY      2.9    17.8    +      -       -      +
    173E  ALA*     3.8    10.8    -      -       -      +
    174E  THR      3.5     1.3    -      -       -      +
    175E  LEU*     1.3    77.5    -      -       -      +
    177E  ALA*     1.3    68.1    +      -       -      +
----------------------------------------------------------
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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