Contacts of the helix formed by residues 150 - 176 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  PRO*     4.2    16.2    -      -       +      +
     32B  ILE*     6.0     0.5    -      -       -      +
     35B  ILE*     3.8    18.1    -      -       +      +
     89B  ARG*     2.8    28.0    +      -       -      -
     93B  LEU*     4.0    13.5    -      -       -      +
    145B  ALA*     2.9    15.9    +      -       -      +
    148B  SER*     3.3    12.0    +      -       -      +
    149B  GLY*     1.3    71.8    -      -       -      +
    151B  ALA*     1.3    63.1    +      -       -      +
    152B  VAL      3.7     0.9    +      -       -      -
    153B  THR*     2.7    29.5    +      -       -      -
    154B  ASP*     3.0    20.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149B  GLY      2.7     9.7    +      -       -      +
    150B  ASP*     1.3    69.9    -      -       -      +
    152B  VAL*     1.3    58.3    +      -       -      +
    154B  ASP*     3.1     9.7    -      -       -      +
    155B  GLY      2.9    25.5    +      -       -      -
    142F  GLN*     3.3    44.6    -      -       +      +
    158F  THR*     3.6    20.9    -      -       +      +
    161F  LEU*     4.7     7.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 152 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89B  ARG*     3.4    37.0    -      -       -      +
     92B  GLN*     4.6     3.1    -      -       -      +
    150B  ASP*     3.3     1.2    +      -       -      -
    151B  ALA*     1.3    77.3    -      -       -      +
    153B  THR*     1.3    63.9    +      -       -      +
    155B  GLY*     3.2     2.9    +      -       -      -
    156B  ILE*     3.0    36.3    +      -       +      +
    158F  THR*     4.4     6.1    -      -       -      +
    161F  LEU*     3.7    46.7    -      -       +      +
    162F  ARG*     3.8    18.9    +      -       +      +
    165F  GLY*     5.8     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 153 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35B  ILE*     4.0    20.2    -      -       +      -
     39B  LEU*     4.3     9.6    -      -       +      -
     89B  ARG*     2.8    27.0    +      -       +      +
     93B  LEU*     4.1     3.3    -      -       -      +
    141B  THR*     4.4     2.9    -      -       +      -
    145B  ALA*     4.1     9.6    -      -       +      -
    150B  ASP*     2.7    34.1    +      -       -      -
    152B  VAL*     1.3    75.8    -      -       -      +
    154B  ASP*     1.3    63.8    +      -       -      +
    156B  ILE*     3.2     5.5    +      -       -      +
    157B  ILE*     2.9    43.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142B  GLN*     2.8    27.5    -      -       -      +
    145B  ALA*     3.8    11.1    -      -       +      +
    146B  ALA*     3.5    26.0    -      -       -      +
    150B  ASP      3.0    14.0    +      -       -      +
    151B  ALA*     3.1    14.8    -      -       -      +
    153B  THR*     1.3    77.2    -      -       -      +
    155B  GLY*     1.3    57.3    +      -       -      +
    157B  ILE*     3.9     3.4    -      -       -      +
    158B  THR*     2.8    40.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 155 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151B  ALA      2.9    14.2    +      -       -      -
    152B  VAL      3.7     2.0    -      -       -      -
    154B  ASP*     1.3    78.3    -      -       -      +
    156B  ILE*     1.3    61.9    +      -       -      +
    158B  THR*     3.9     5.6    -      -       -      -
    159B  ASP*     3.0    30.2    +      -       -      +
    158F  THR*     4.8     7.6    -      -       -      -
    162F  ARG*     3.2    16.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 156 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85B  THR*     4.0    28.5    -      -       -      +
     86B  ILE*     4.4     7.6    -      -       +      -
     89B  ARG*     3.9    36.6    -      -       +      -
     92B  GLN*     5.5     2.7    -      -       -      +
    152B  VAL*     3.0    28.1    +      -       +      +
    153B  THR      3.6     4.3    -      -       -      +
    155B  GLY*     1.3    78.8    -      -       -      +
    157B  ILE*     1.3    72.4    +      -       +      +
    159B  ASP*     3.3     3.5    +      -       -      +
    160B  ILE*     3.3    27.8    +      -       +      +
    162F  ARG*     3.6    32.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 157 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39B  LEU*     4.3     9.9    -      -       +      -
     42B  HIS*     4.8     0.4    -      -       +      -
     86B  ILE*     4.8     6.7    -      -       +      -
     89B  ARG*     6.1     0.9    -      -       +      -
    138B  PHE*     3.3    47.3    -      -       +      +
    141B  THR*     4.0    17.9    -      -       +      -
    142B  GLN*     3.6    12.3    -      -       +      -
    153B  THR*     2.9    40.2    +      -       +      +
    154B  ASP      4.0     1.8    -      -       -      +
    156B  ILE*     1.3    85.4    -      -       +      +
    158B  THR*     1.3    60.6    +      -       -      +
    160B  ILE*     3.1     9.0    +      -       -      +
    161B  LEU*     2.7    40.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 158 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142B  GLN*     3.9     2.8    +      -       -      +
    154B  ASP*     2.8    37.5    +      -       -      -
    155B  GLY*     3.9     6.1    -      -       -      -
    157B  ILE*     1.3    77.0    -      -       -      +
    159B  ASP*     1.3    59.9    +      -       -      +
    161B  LEU*     3.2    10.3    +      -       -      +
    162B  ARG*     2.9    32.2    +      -       -      +
    151J  ALA*     3.5    41.8    -      -       +      +
    152J  VAL*     4.2     4.8    -      -       -      +
    155J  GLY*     4.9     9.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 159 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155B  GLY*     3.0    18.1    +      -       -      +
    156B  ILE      3.6     5.4    -      -       -      +
    158B  THR*     1.3    77.6    -      -       -      +
    160B  ILE*     1.3    62.7    +      -       +      +
    162B  ARG*     3.2    31.2    +      -       -      +
    163B  THR*     3.3    19.2    +      -       -      +
    162F  ARG*     2.9    34.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 160 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  ALA*     3.7    29.4    -      -       +      -
     85B  THR*     4.3     3.6    -      -       -      +
     86B  ILE*     3.6    35.9    -      -       +      -
    138B  PHE*     3.8    30.7    -      -       +      -
    156B  ILE*     3.3    21.3    +      -       +      +
    157B  ILE*     3.1     9.8    +      -       -      +
    159B  ASP*     1.3    75.1    -      -       +      +
    161B  LEU*     1.3    67.2    +      -       -      +
    163B  THR*     3.0    13.4    +      -       -      +
    164B  LEU*     2.9    26.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 161 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  SER*     3.6    32.3    +      -       -      +
    138B  PHE*     3.3    28.0    -      -       +      -
    139B  SER*     4.0    21.5    -      -       -      +
    142B  GLN*     4.1    12.1    -      -       +      -
    157B  ILE*     2.7    34.5    +      -       +      +
    158B  THR*     3.3    14.1    -      -       -      +
    160B  ILE*     1.3    74.4    -      -       -      +
    162B  ARG*     1.3    56.9    +      -       -      +
    164B  LEU*     3.4     5.5    +      -       +      +
    165B  GLY*     2.9    26.5    +      -       -      -
    151J  ALA*     4.7     6.3    -      -       +      -
    152J  VAL*     3.7    18.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 162 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158B  THR*     2.9    16.3    +      -       -      +
    159B  ASP*     3.5    25.2    +      -       -      +
    160B  ILE      3.1     0.2    -      -       -      -
    161B  LEU*     1.3    77.2    -      -       -      +
    163B  THR*     1.3    64.7    +      -       +      +
    165B  GLY*     3.3     1.9    +      -       -      -
    166B  LYS*     3.2    21.7    +      -       +      +
     92J  GLN*     5.1     3.3    +      -       -      +
    152J  VAL*     3.7    26.1    +      -       +      +
    155J  GLY*     3.2    26.9    +      -       -      -
    156J  ILE*     4.0    29.6    -      -       +      +
    159J  ASP*     2.9    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 163 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78B  SER*     4.4    14.0    +      -       -      +
    159B  ASP      3.3    13.0    +      -       -      +
    160B  ILE*     3.0    17.6    +      -       -      +
    162B  ARG*     1.3    79.5    -      -       +      +
    164B  LEU*     1.3    63.7    +      -       -      +
    166B  LYS*     3.4     7.7    +      -       -      +
    167B  ALA*     3.1    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 164 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  VAL*     6.5     0.2    -      -       +      -
    131B  PHE*     3.8    44.9    -      -       +      +
    134B  LEU*     4.0     7.6    -      -       +      -
    135B  SER*     3.9    22.2    -      -       -      +
    138B  PHE*     3.5    37.0    -      -       +      -
    160B  ILE*     2.9    23.5    +      -       +      +
    161B  LEU*     3.7     7.9    -      -       +      +
    163B  THR*     1.3    79.1    +      -       -      +
    165B  GLY*     1.3    57.9    +      -       -      +
    167B  ALA*     3.2     4.1    +      -       -      +
    168B  ILE*     2.8    42.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 165 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135B  SER*     5.6     1.8    +      -       -      -
    161B  LEU      2.9    16.5    +      -       -      -
    162B  ARG*     3.3     2.4    +      -       -      -
    163B  THR      3.3     0.2    -      -       -      -
    164B  LEU*     1.3    77.5    -      -       -      +
    166B  LYS*     1.3    60.0    +      -       -      +
    168B  ILE*     3.5     8.6    +      -       -      +
    169B  TRP*     3.0    24.6    +      -       -      +
     89J  ARG*     5.1     4.5    -      -       -      -
     92J  GLN*     3.9    19.4    -      -       -      +
    152J  VAL*     5.9     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 166 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162B  ARG*     3.2    12.4    +      -       +      +
    163B  THR*     3.8     9.9    -      -       -      +
    165B  GLY*     1.3    76.8    -      -       -      +
    167B  ALA*     1.3    57.1    +      -       -      +
    169B  TRP*     3.3    14.5    +      -       +      +
    170B  MET*     3.0    55.1    +      -       +      +
     88J  GLU*     2.7    40.0    +      -       -      +
     92J  GLN*     3.8    17.3    +      -       -      +
     69K  HIS*     5.2     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 167 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  TYR*     4.0    19.5    +      -       +      -
    131B  PHE*     3.8    26.7    -      -       +      -
    163B  THR      3.1    17.2    +      -       -      +
    164B  LEU*     3.7     4.9    -      -       -      +
    166B  LYS*     1.3    75.5    -      -       -      +
    168B  ILE*     1.3    59.3    +      -       -      +
    170B  MET*     3.3     9.0    +      -       -      +
    171B  LEU*     2.9    37.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 168 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  LYS*     3.8    11.5    -      -       +      +
    131B  PHE*     3.6    44.4    -      -       +      +
    132B  GLU*     3.8    33.4    -      -       +      +
    135B  SER*     4.0    15.0    -      -       -      +
    164B  LEU      2.8    28.9    +      -       -      +
    165B  GLY*     3.8     7.0    -      -       -      +
    167B  ALA*     1.3    70.8    -      -       -      +
    169B  TRP*     1.3    59.5    +      -       -      +
    171B  LEU*     3.4     6.4    +      -       -      +
    172B  GLY*     2.9    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 169 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165B  GLY      3.0    18.1    +      -       -      +
    166B  LYS*     3.6    29.8    -      -       +      +
    167B  ALA      3.2     0.2    -      -       -      -
    168B  ILE*     1.3    79.3    -      -       -      +
    170B  MET*     1.3    81.3    +      -       +      +
    172B  GLY*     3.2     2.2    +      -       -      -
    173B  ALA*     2.9    31.7    +      -       +      +
     88J  GLU*     4.0    10.5    -      -       +      -
     91J  LEU*     3.4    54.1    -      -       +      +
     92J  GLN*     3.5    26.2    -      -       +      -
     58K  TRP      4.0     8.5    +      -       -      -
     65K  PHE*     3.7    18.6    -      +       -      -
     69K  HIS*     3.6    28.9    -      +       -      -
----------------------------------------------------------
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Residues in contact with MET 170 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  TYR*     5.2     4.5    -      -       -      +
    166B  LYS*     3.0    57.7    +      -       +      +
    167B  ALA*     3.3     7.4    +      -       -      +
    169B  TRP*     1.3    95.7    -      -       +      +
    171B  LEU*     1.3    57.5    +      -       -      +
    173B  ALA*     3.1     2.8    +      -       -      +
    174B  THR*     2.6    37.1    +      -       +      +
     65K  PHE*     3.7    23.5    -      -       +      -
     66K  LYS*     4.9    22.9    -      -       +      -
     69K  HIS*     4.7    10.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 171 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  LEU*     4.6     4.9    -      -       +      -
     75B  TYR*     3.5    19.3    -      -       +      +
    124B  LEU*     3.9    40.8    -      -       +      -
    127B  VAL*     3.3    26.9    -      -       +      -
    128B  LYS*     3.7    29.4    -      -       +      -
    131B  PHE*     3.8    15.0    -      -       +      -
    167B  ALA      2.9    20.9    +      -       -      +
    168B  ILE*     3.8     4.3    -      -       -      +
    170B  MET*     1.3    76.0    -      -       -      +
    172B  GLY*     1.3    57.8    +      -       -      +
    174B  THR*     3.2     7.1    +      -       +      +
    175B  LEU*     2.9    36.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 172 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  LYS*     3.5    23.3    -      -       -      +
    168B  ILE      2.9    12.2    +      -       -      -
    169B  TRP*     3.6     4.0    -      -       -      -
    171B  LEU*     1.3    78.0    -      -       -      +
    173B  ALA*     1.3    56.3    +      -       -      +
    175B  LEU*     3.4     3.3    +      -       -      +
    176B  LYS*     2.9    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 173 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169B  TRP*     2.9    21.7    +      -       -      +
    170B  MET      3.1     8.0    +      -       -      +
    172B  GLY*     1.3    78.0    -      -       -      +
    174B  THR*     1.3    59.3    +      -       -      +
    175B  LEU      3.6     0.2    +      -       -      -
    176B  LYS*     3.7     8.0    +      -       -      -
     60K  ILE      4.4     5.4    -      -       -      +
     61K  TYR*     3.3     9.7    -      -       +      +
     62K  GLY      2.8    23.1    +      -       -      -
     65K  PHE*     3.6    35.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 174 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  LEU*     6.2     3.1    -      -       +      -
    124B  LEU*     3.8    24.1    -      -       +      +
    170B  MET*     2.6    32.2    +      -       +      +
    171B  LEU*     3.5    10.1    +      -       +      +
    173B  ALA*     1.3    75.7    -      -       -      +
    175B  LEU*     1.3    61.9    +      -       -      +
    176B  LYS      4.4     0.5    -      -       -      +
     62K  GLY*     2.9    15.4    -      -       -      -
     63K  ILE*     3.1    41.6    +      -       -      +
     65K  PHE*     3.6    18.6    -      -       +      -
     66K  LYS*     4.5     7.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 175 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  VAL*     3.7    41.7    -      -       +      +
    124B  LEU*     3.8    18.8    -      -       +      +
    125B  ALA*     3.5    33.9    -      -       +      +
    128B  LYS*     4.2    15.9    -      -       +      -
    171B  LEU      2.9    19.4    +      -       -      +
    172B  GLY*     3.8     3.8    -      -       -      +
    174B  THR*     1.3    83.2    -      -       -      +
    176B  LYS*     1.3    65.2    +      -       -      +
    177B  ALA*     3.4     5.7    +      -       -      +
     63K  ILE*     5.9     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 176 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172B  GLY      2.9    17.6    +      -       -      +
    173B  ALA*     3.8    10.5    -      -       -      +
    174B  THR      3.4     1.3    -      -       -      +
    175B  LEU*     1.3    78.3    -      -       -      +
    177B  ALA*     1.3    69.1    +      -       -      +
     59K  HIS      5.4     0.6    +      -       -      -
     61K  TYR*     3.5    44.3    -      -       +      +
     62K  GLY*     4.1    11.3    -      -       -      -
    117K  GLU*     2.8    49.8    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il