Contacts of the helix formed by residues 150 - 176 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  ILE*     6.0     1.9    -      -       -      +
     35A  ILE*     3.8    13.0    -      -       +      +
     89A  ARG*     2.9    27.0    +      -       -      -
     93A  LEU*     4.1    12.8    -      -       -      +
    145A  ALA*     2.8    20.5    +      -       +      +
    148A  SER*     3.3    12.2    -      -       -      +
    149A  GLY*     1.3    71.9    -      -       -      +
    151A  ALA*     1.3    60.2    +      -       -      +
    152A  VAL      3.6     1.0    +      -       -      -
    153A  THR*     2.6    30.5    +      -       -      +
    154A  ASP*     3.0    19.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  GLY      2.8    10.0    +      -       -      +
    150A  ASP*     1.3    72.0    -      -       -      +
    152A  VAL*     1.3    57.6    +      -       -      +
    154A  ASP*     3.1     9.2    -      -       -      +
    155A  GLY      2.9    24.9    +      -       -      -
    142H  GLN*     3.5    39.5    -      -       +      +
    158H  THR*     3.5    24.9    -      -       +      +
    161H  LEU*     4.9     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89A  ARG*     3.5    35.9    -      -       -      +
     92A  GLN*     4.7     2.7    -      -       -      +
    150A  ASP*     3.3     0.8    +      -       -      -
    151A  ALA*     1.3    76.1    -      -       -      +
    153A  THR*     1.3    63.6    +      -       -      +
    155A  GLY*     3.2     2.6    +      -       -      -
    156A  ILE*     3.0    35.9    +      -       +      +
    158H  THR*     4.2     7.4    -      -       +      +
    161H  LEU*     3.7    45.3    -      -       +      +
    162H  ARG*     3.7    20.7    +      -       +      +
    165H  GLY*     6.1     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  ILE*     4.0    21.3    -      -       +      -
     39A  LEU*     4.3     9.4    -      -       +      -
     89A  ARG*     2.8    28.0    +      -       +      +
     93A  LEU*     4.1     2.9    -      -       -      +
    141A  THR*     4.4     2.9    -      -       +      -
    145A  ALA*     4.0     9.9    -      -       +      -
    150A  ASP*     2.6    31.9    +      -       -      -
    152A  VAL*     1.3    75.0    -      -       -      +
    154A  ASP*     1.3    64.3    +      -       -      +
    156A  ILE*     3.2     5.3    +      -       -      -
    157A  ILE*     2.9    48.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  GLN*     2.9    30.4    -      -       -      +
    145A  ALA*     3.7    11.4    -      -       +      +
    146A  ALA*     3.5    21.7    -      -       -      +
    150A  ASP      3.0    13.8    +      -       -      +
    151A  ALA*     3.1    14.8    -      -       -      +
    153A  THR*     1.3    78.3    -      -       -      +
    155A  GLY*     1.3    55.6    +      -       -      +
    157A  ILE*     3.8     3.6    -      -       -      +
    158A  THR*     2.8    44.5    +      -       -      -
    151K  ALA*     5.1     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  ALA      2.9    14.3    +      -       -      -
    152A  VAL      3.2     2.0    +      -       -      -
    154A  ASP*     1.3    77.3    -      -       -      +
    156A  ILE*     1.3    62.3    +      -       -      +
    158A  THR*     3.8     5.6    -      -       -      -
    159A  ASP*     3.0    31.3    +      -       -      +
    158H  THR*     5.0     6.3    -      -       -      -
    162H  ARG*     3.3    16.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  THR*     4.1    27.6    -      -       -      +
     86A  ILE*     4.4     7.9    -      -       +      -
     89A  ARG*     3.9    36.3    -      -       +      -
     92A  GLN*     5.5     2.5    -      -       -      +
    152A  VAL*     3.0    27.5    +      -       +      +
    153A  THR*     3.6     4.7    -      -       -      +
    155A  GLY*     1.3    77.7    -      -       -      +
    157A  ILE*     1.3    72.3    +      -       +      +
    159A  ASP*     3.3     3.5    +      -       -      +
    160A  ILE*     3.3    28.0    +      -       +      +
    162H  ARG*     3.5    32.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  LEU*     4.2    10.5    -      -       +      -
     42A  HIS*     4.9     0.7    -      -       +      -
     86A  ILE*     4.8     7.4    -      -       +      -
     89A  ARG*     6.0     0.7    -      -       +      -
    138A  PHE*     3.3    44.6    -      -       +      +
    141A  THR*     4.0    19.5    -      -       +      -
    142A  GLN*     3.8    11.2    -      -       +      -
    153A  THR*     2.9    40.4    +      -       +      +
    154A  ASP      4.0     2.2    -      -       -      +
    156A  ILE*     1.3    87.5    -      -       +      +
    158A  THR*     1.3    52.8    +      -       -      +
    160A  ILE*     3.1     9.9    +      -       -      +
    161A  LEU*     2.7    46.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  GLN*     3.9     3.3    -      -       -      +
    154A  ASP*     2.8    37.6    +      -       -      -
    155A  GLY*     3.8     6.1    -      -       -      -
    157A  ILE*     1.3    77.7    -      -       -      +
    159A  ASP*     1.3    60.1    +      -       -      +
    161A  LEU*     3.2    10.0    +      -       -      +
    162A  ARG*     2.8    31.9    +      -       +      +
    151K  ALA*     3.5    44.4    -      -       +      +
    152K  VAL*     4.1     6.0    -      -       +      +
    155K  GLY*     5.0     8.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155A  GLY*     3.0    17.5    +      -       -      +
    156A  ILE*     3.6     5.8    -      -       -      +
    158A  THR*     1.3    77.5    -      -       -      +
    160A  ILE*     1.3    64.4    +      -       +      +
    162A  ARG*     3.2    30.6    +      -       -      +
    163A  THR*     3.3    19.4    +      -       -      +
    162H  ARG*     3.2    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  ALA*     3.7    30.1    -      -       +      -
     85A  THR*     4.3     3.4    -      -       -      +
     86A  ILE*     3.6    36.6    -      -       +      -
    138A  PHE*     3.8    31.9    -      -       +      -
    156A  ILE*     3.4    21.5    -      -       +      +
    157A  ILE*     3.1     9.1    +      -       -      +
    159A  ASP*     1.3    75.1    -      -       +      +
    161A  LEU*     1.3    67.2    +      -       -      +
    163A  THR*     3.0    12.9    +      -       -      +
    164A  LEU*     2.9    27.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  SER*     3.6    31.1    +      -       -      +
    138A  PHE*     3.3    29.2    -      -       +      -
    139A  SER*     4.0    16.4    -      -       -      +
    142A  GLN*     4.0    19.7    -      -       +      -
    157A  ILE*     2.7    33.6    +      -       +      +
    158A  THR*     3.2    12.8    +      -       -      +
    160A  ILE*     1.3    74.0    -      -       -      +
    162A  ARG*     1.3    56.3    +      -       -      +
    164A  LEU*     3.6     4.6    -      -       +      +
    165A  GLY*     2.9    26.9    +      -       -      -
    151K  ALA*     4.9     5.6    -      -       +      -
    152K  VAL*     3.7    18.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  THR*     2.8    16.4    +      -       -      +
    159A  ASP*     3.4    24.8    +      -       -      +
    160A  ILE      3.1     0.2    -      -       -      -
    161A  LEU*     1.3    76.8    -      -       -      +
    163A  THR*     1.3    64.0    +      -       +      +
    165A  GLY*     3.3     2.4    +      -       -      -
    166A  LYS*     3.2    22.5    +      -       +      +
     92K  GLN*     5.1     3.3    +      -       -      +
    152K  VAL*     3.8    26.2    +      -       +      +
    155K  GLY*     3.2    26.7    +      -       -      -
    156K  ILE*     3.9    30.5    -      -       +      +
    159K  ASP*     3.0    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78A  SER*     4.5    14.3    +      -       -      +
    159A  ASP      3.4    13.9    -      -       -      +
    160A  ILE*     3.0    15.4    +      -       -      +
    162A  ARG*     1.3    78.6    -      -       +      +
    164A  LEU*     1.3    66.6    +      -       -      +
    166A  LYS*     3.4     6.1    +      -       -      +
    167A  ALA*     3.1    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131A  PHE*     3.8    45.8    -      -       +      +
    134A  LEU*     4.0     7.6    -      -       +      -
    135A  SER*     3.9    22.7    -      -       -      +
    138A  PHE*     3.5    37.7    -      -       +      -
    160A  ILE*     2.9    22.4    +      -       +      +
    161A  LEU*     3.6     8.1    -      -       +      +
    163A  THR*     1.3    80.4    +      -       -      +
    165A  GLY*     1.3    57.8    +      -       -      +
    167A  ALA*     3.2     4.2    +      -       +      +
    168A  ILE*     2.8    42.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135A  SER*     5.7     1.5    +      -       -      -
    161A  LEU      2.9    16.5    +      -       -      -
    162A  ARG*     3.3     2.7    +      -       -      -
    164A  LEU*     1.3    77.8    -      -       -      +
    166A  LYS*     1.3    61.2    +      -       -      +
    168A  ILE*     3.5     9.1    +      -       -      +
    169A  TRP*     3.0    24.4    +      -       -      +
     89K  ARG*     5.1     4.0    -      -       -      -
     92K  GLN*     3.9    17.9    -      -       -      +
    152K  VAL*     6.0     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  ARG*     3.2    12.8    +      -       +      +
    163A  THR*     3.8     9.4    -      -       -      +
    164A  LEU      3.2     0.2    -      -       -      -
    165A  GLY*     1.3    78.5    -      -       -      +
    167A  ALA*     1.3    56.9    +      -       -      +
    169A  TRP*     3.4    19.2    +      -       +      +
    170A  MET*     3.0    54.2    +      -       +      +
     69J  HIS*     4.8     3.8    +      -       -      -
     88K  GLU*     3.0    34.2    +      -       -      +
     92K  GLN*     3.7    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  TYR*     4.0    20.4    +      -       +      -
    131A  PHE*     3.8    26.0    -      -       +      -
    163A  THR      3.1    17.4    +      -       -      +
    164A  LEU*     3.2     5.1    +      -       +      +
    166A  LYS*     1.3    74.9    -      -       -      +
    168A  ILE*     1.3    59.8    +      -       -      +
    170A  MET*     3.3     9.0    +      -       -      +
    171A  LEU*     2.8    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  LYS*     3.8    10.4    -      -       +      +
    131A  PHE*     3.6    44.4    -      -       +      +
    132A  GLU*     3.8    33.9    -      -       +      +
    135A  SER*     4.0    15.0    -      -       -      +
    164A  LEU      2.8    28.0    +      -       -      +
    165A  GLY*     3.8     7.0    -      -       -      +
    167A  ALA*     1.3    71.7    -      -       -      +
    169A  TRP*     1.3    60.6    +      -       -      +
    171A  LEU*     3.4     7.4    +      -       -      +
    172A  GLY*     2.9    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165A  GLY      3.0    18.3    +      -       -      +
    166A  LYS*     3.8    28.3    -      -       +      -
    168A  ILE*     1.3    79.8    -      -       -      +
    170A  MET*     1.3    88.2    +      -       +      +
    172A  GLY*     3.2     2.5    +      -       -      -
    173A  ALA*     3.0    24.9    +      -       +      +
     58J  TRP      4.1     8.3    +      -       -      -
     65J  PHE*     3.7    19.3    -      +       -      -
     69J  HIS*     3.6    28.0    -      +       -      -
     88K  GLU*     4.2     9.9    -      -       +      -
     91K  LEU*     3.4    54.7    +      -       +      +
     92K  GLN*     3.7    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  TYR*     5.2     4.3    -      -       -      +
    166A  LYS*     3.0    56.6    +      -       +      +
    167A  ALA*     3.8     7.6    -      -       -      +
    169A  TRP*     1.3    95.0    -      -       +      +
    171A  LEU*     1.3    56.9    +      -       -      +
    173A  ALA*     3.1     3.8    +      -       -      +
    174A  THR*     2.7    37.8    +      -       +      +
     65J  PHE*     3.8    24.9    -      -       +      -
     66J  LYS*     5.1    21.8    -      -       +      -
     69J  HIS*     4.6    11.7    -      -       +      -
     70J  GLU*     6.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  LEU*     4.5     5.8    -      -       +      -
     75A  TYR*     3.5    20.0    -      -       +      +
    124A  LEU*     4.0    39.0    -      -       +      -
    127A  VAL*     3.3    27.4    -      -       +      -
    128A  LYS*     3.6    29.6    -      -       +      -
    131A  PHE*     3.8    15.7    -      -       +      -
    167A  ALA      2.8    20.1    +      -       -      +
    168A  ILE*     3.7     3.6    -      -       -      +
    170A  MET*     1.3    75.4    -      -       -      +
    172A  GLY*     1.3    63.7    +      -       -      +
    174A  THR*     3.2     5.9    +      -       +      +
    175A  LEU*     2.9    29.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  LYS*     3.5    23.8    -      -       -      +
    168A  ILE      2.9    12.4    +      -       -      -
    169A  TRP*     3.6     4.0    -      -       -      -
    170A  MET      3.2     0.2    -      -       -      -
    171A  LEU*     1.3    77.7    -      -       -      +
    173A  ALA*     1.3    55.4    +      -       -      +
    175A  LEU*     3.8     2.3    -      -       -      +
    176A  LYS*     2.9    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169A  TRP*     3.0    21.2    +      -       -      +
    170A  MET*     3.1     8.7    +      -       -      +
    172A  GLY*     1.3    77.7    -      -       -      +
    174A  THR*     1.3    59.0    +      -       -      +
    175A  LEU      3.6     0.2    +      -       -      -
    176A  LYS*     3.7     8.1    +      -       -      -
     60J  ILE      4.5     4.7    -      -       -      +
     61J  TYR*     3.4     8.9    -      -       +      +
     62J  GLY      2.9    23.8    +      -       -      -
     65J  PHE*     3.6    34.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  LEU*     3.8    23.7    -      -       +      +
    170A  MET*     2.7    32.3    +      -       +      +
    171A  LEU*     3.7    10.2    +      -       +      +
    173A  ALA*     1.3    75.3    -      -       -      +
    175A  LEU*     1.3    62.4    +      -       -      +
    176A  LYS      3.4     0.6    -      -       -      +
     62J  GLY*     2.9    14.6    -      -       -      -
     63J  ILE*     3.1    41.7    +      -       -      +
     65J  PHE*     3.6    18.2    -      -       +      -
     66J  LYS*     4.5     8.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  VAL*     3.7    41.3    -      -       +      +
    124A  LEU*     3.8    16.8    -      -       +      +
    125A  ALA*     3.5    35.2    -      -       +      +
    128A  LYS*     4.2    15.3    -      -       +      -
    171A  LEU*     2.9    21.6    +      -       +      +
    172A  GLY*     4.1     3.6    -      -       -      +
    174A  THR*     1.3    84.2    -      -       -      +
    176A  LYS*     1.3    63.8    +      -       -      +
    177A  ALA*     3.4     5.4    +      -       -      +
     63J  ILE*     5.9     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  GLY      2.9    17.8    +      -       -      +
    173A  ALA*     3.8    10.3    -      -       -      +
    174A  THR      3.4     1.3    -      -       -      +
    175A  LEU*     1.3    78.9    -      -       -      +
    177A  ALA*     1.3    68.2    +      -       -      +
     59J  HIS      5.6     0.2    +      -       -      -
     61J  TYR*     3.6    44.1    -      -       +      +
     62J  GLY*     4.1    10.7    -      -       -      -
     63J  ILE      5.2     0.2    +      -       -      -
    117J  GLU*     2.8    46.6    +      -       -      +
----------------------------------------------------------
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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