Contacts of the helix formed by residues 166 - 192 (chain B) in PDB entry 3P9K


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 166 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  VAL*     3.9     7.1    -      -       -      +
    162B  TYR*     2.8    49.2    +      -       +      +
    163B  HIS      3.2     5.0    +      -       -      +
    165B  THR*     1.3    79.6    -      -       -      +
    167B  PRO*     1.3    61.4    -      -       -      +
    168B  ARG*     3.2    15.5    +      -       -      +
    169B  PHE*     2.9    28.2    +      -       +      +
    170B  ASN*     2.9    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 167 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163B  HIS      5.0     0.2    -      -       -      +
    164B  GLY      6.0     0.7    -      -       -      +
    165B  THR      3.5    11.0    -      -       -      +
    166B  ASP*     1.3    83.3    -      -       -      +
    168B  ARG*     1.3    64.2    +      -       -      +
    170B  ASN*     3.2     7.7    +      -       +      +
    171B  ARG*     3.1    41.4    +      -       -      +
    191C  LEU*     6.0     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 168 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130B  ASP*     2.8    43.2    +      -       -      -
    131B  LYS*     5.2     3.6    -      -       -      +
    132B  VAL*     3.5    19.2    -      -       -      +
    166B  ASP*     3.2    10.5    +      -       -      +
    167B  PRO*     1.3    82.3    -      -       -      +
    169B  PHE*     1.3    70.2    +      -       -      +
    171B  ARG*     3.2    27.7    +      -       -      +
    172B  VAL*     3.2    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 169 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127B  MET*     4.2    10.1    -      -       +      -
    130B  ASP*     3.5    40.2    -      -       +      -
    132B  VAL*     3.9    20.4    -      -       +      -
    133B  LEU*     3.4    36.8    -      -       +      -
    151B  PHE*     5.8     1.1    -      +       -      -
    162B  TYR*     4.4     4.7    -      +       -      -
    163B  HIS*     3.6    35.7    -      +       -      -
    166B  ASP*     2.9    31.5    +      -       +      +
    168B  ARG*     1.3    78.4    -      -       -      +
    170B  ASN*     1.3    66.6    +      -       -      +
    172B  VAL*     3.0    16.6    +      -       +      +
    173B  PHE*     2.8    27.9    +      +       +      +
----------------------------------------------------------
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Residues in contact with ASN 170 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163B  HIS*     3.5    38.8    +      -       -      +
    166B  ASP      2.9    19.2    +      -       -      +
    167B  PRO*     3.2    10.5    +      -       +      +
    169B  PHE*     1.3    76.3    -      -       -      +
    171B  ARG*     1.3    65.8    +      -       -      +
    173B  PHE*     3.4     4.4    +      -       -      +
    174B  ASN*     3.1    52.3    +      -       -      +
    231B  HIS*     3.9    17.8    +      -       -      -
    232B  VAL*     4.9     2.4    -      -       -      +
    235B  GLU*     3.8    24.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 171 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167B  PRO*     3.1    38.1    +      -       -      +
    168B  ARG*     3.5    31.1    +      -       -      +
    169B  PHE      3.1     0.6    -      -       -      -
    170B  ASN*     1.3    78.8    -      -       -      +
    172B  VAL*     1.3    66.8    +      -       +      +
    173B  PHE      3.1     0.2    +      -       -      -
    174B  ASN*     3.1     7.8    +      -       -      +
    175B  GLU*     2.8    28.6    +      -       +      +
    235B  GLU*     5.2     9.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 172 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  ALA      4.7     1.7    -      -       -      +
    126B  LEU*     4.1    11.4    -      -       +      +
    127B  MET*     3.5    34.5    -      -       +      +
    130B  ASP*     4.4     3.4    -      -       -      +
    168B  ARG*     3.2    32.9    +      -       +      +
    169B  PHE*     3.0    21.9    +      -       +      +
    171B  ARG*     1.3    79.4    -      -       +      +
    173B  PHE*     1.3    57.2    +      -       -      +
    175B  GLU*     3.8     4.8    -      -       -      +
    176B  GLY*     3.0    24.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 173 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127B  MET*     3.7    25.9    -      -       +      +
    133B  LEU*     5.6     2.2    -      -       +      -
    160B  PHE*     4.4     3.6    -      +       -      -
    163B  HIS*     3.5    40.8    -      +       +      +
    169B  PHE*     2.8    24.6    +      +       +      +
    170B  ASN*     3.6     6.1    -      -       -      +
    171B  ARG      3.1     0.2    -      -       -      -
    172B  VAL*     1.3    75.6    -      -       -      +
    174B  ASN*     1.3    73.8    +      -       -      +
    176B  GLY*     3.1     2.8    +      -       -      -
    177B  MET*     2.9    52.8    +      -       +      +
    402B  SAH      3.9    25.6    -      -       -      -
    602B  CIY      3.5    41.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with ASN 174 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170B  ASN*     3.1    43.5    +      -       -      +
    171B  ARG*     3.9     5.1    -      -       -      +
    173B  PHE*     1.3    88.7    -      -       -      +
    175B  GLU*     1.3    57.1    +      -       -      +
    177B  MET*     3.6     5.6    -      -       -      +
    178B  LYS*     2.6    37.9    +      -       -      +
    207B  GLY*     5.5     2.8    -      -       -      -
    208B  VAL*     3.8    30.4    -      -       +      +
    232B  VAL*     4.7    17.5    -      -       -      +
    235B  GLU*     4.6     9.9    -      -       -      +
    402B  SAH      5.2     2.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 175 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  VAL*     5.8     0.3    -      -       -      +
    123B  ALA*     4.0     8.3    -      -       +      -
    171B  ARG*     2.8    19.2    +      -       +      +
    172B  VAL*     3.8     5.4    -      -       -      +
    174B  ASN*     1.3    74.9    -      -       -      +
    176B  GLY*     1.3    66.7    +      -       -      +
    178B  LYS*     3.2    32.9    +      -       -      +
    179B  ASN*     2.7    51.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 176 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  ALA*     3.6    26.2    -      -       -      +
    124B  LEU*     3.7    23.5    -      -       -      +
    127B  MET*     4.7     3.4    -      -       -      -
    172B  VAL      3.0    15.6    +      -       -      -
    173B  PHE      3.1     3.3    +      -       -      -
    175B  GLU*     1.3    78.7    -      -       -      +
    177B  MET*     1.3    61.0    +      -       -      +
    179B  ASN*     3.5     2.8    +      -       -      +
    180B  HIS*     3.3    15.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 177 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  LEU*     3.6    16.6    -      -       +      -
    127B  MET*     3.6    30.5    -      -       +      -
    173B  PHE*     2.9    41.6    +      -       +      +
    174B  ASN*     3.6     6.1    -      -       -      +
    176B  GLY*     1.3    73.3    -      -       -      +
    178B  LYS*     1.3    64.8    +      -       -      +
    180B  HIS*     3.3     4.8    +      -       -      +
    181B  SER*     2.9    26.2    +      -       -      -
    207B  GLY*     6.3     0.9    -      -       -      -
    262B  LYS*     4.9     0.2    +      -       -      -
    263B  TRP*     3.8    28.7    -      -       +      -
    402B  SAH      3.5    25.8    +      -       +      +
    602B  CIY      3.9    26.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 178 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174B  ASN      2.6    21.4    +      -       -      +
    175B  GLU*     3.2    38.1    +      -       -      +
    177B  MET*     1.3    72.2    -      -       -      +
    179B  ASN*     1.3    67.0    +      -       -      +
    181B  SER*     3.1     6.3    +      -       -      -
    182B  ILE*     2.9    42.8    +      -       +      +
    208B  VAL*     4.0    23.5    -      -       +      +
    210B  ALA*     3.9    21.8    -      -       +      -
    239B  PHE*     6.4     1.6    -      -       +      -
    402B  SAH      5.0     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 179 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118B  GLY      4.4     1.9    +      -       -      +
    119B  VAL*     3.3    24.4    -      -       +      +
    120B  SER*     3.2    36.5    +      -       -      +
    123B  ALA*     3.7    16.6    +      -       +      +
    124B  LEU*     5.7     0.9    -      -       +      +
    175B  GLU*     2.7    55.9    +      -       -      +
    176B  GLY      3.8     4.3    -      -       -      +
    178B  LYS*     1.3    79.5    -      -       -      +
    180B  HIS*     1.3    63.2    +      -       -      +
    182B  ILE*     3.5     1.7    +      -       -      +
    183B  ILE*     3.3    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 180 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  LEU*     4.2    19.9    -      -       +      +
    121B  MET*     4.2    13.2    -      -       +      -
    124B  LEU*     3.9    21.7    -      -       +      +
    176B  GLY      3.3    10.3    +      -       -      +
    177B  MET      3.3     7.6    +      -       -      +
    179B  ASN*     1.3    80.2    -      -       -      +
    181B  SER*     1.3    57.8    +      -       -      +
    183B  ILE*     3.5     4.5    +      -       -      +
    184B  ILE*     3.0    55.4    +      -       +      +
    262B  LYS*     3.0    28.8    +      -       -      +
    263B  TRP*     3.6    42.2    -      +       +      -
    351B  ALA      5.5     2.0    +      -       -      -
    353B  ALA*     5.4     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 181 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  MET      2.9     9.3    +      -       -      -
    178B  LYS*     3.5     6.5    -      -       -      -
    180B  HIS*     1.3    74.7    -      -       -      +
    182B  ILE*     1.3    60.9    +      -       -      +
    183B  ILE      3.0     0.5    +      -       -      -
    184B  ILE      3.0     0.5    +      -       -      -
    185B  THR*     2.7    37.5    +      -       -      -
    210B  ALA*     5.2     2.2    -      -       -      -
    211B  THR*     3.3    25.5    +      -       -      -
    262B  LYS*     3.4    17.0    +      -       -      +
    402B  SAH      2.5    34.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 182 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117B  ASP*     4.0    25.4    -      -       +      +
    119B  VAL*     3.8    34.3    -      -       +      -
    178B  LYS*     2.9    40.7    +      -       +      +
    179B  ASN      3.9     3.6    -      -       -      +
    181B  SER*     1.3    74.4    -      -       -      +
    183B  ILE*     1.3    62.3    +      -       -      +
    185B  THR*     4.2     4.3    -      -       -      -
    186B  LYS*     3.5    20.6    +      -       -      +
    210B  ALA*     4.1    20.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 183 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  CYS*     5.3     5.4    -      -       -      -
    111B  PHE*     6.2     5.6    -      -       +      -
    115B  ASN*     4.2    10.8    -      -       -      +
    119B  VAL*     3.3    25.6    -      -       +      +
    120B  SER*     3.8    22.2    -      -       -      +
    121B  MET*     3.3    33.7    -      -       +      -
    179B  ASN      3.3    17.4    +      -       -      +
    180B  HIS      3.7     4.0    -      -       -      +
    181B  SER      3.0     0.6    -      -       -      -
    182B  ILE*     1.3    75.7    -      -       -      +
    184B  ILE*     1.3    70.6    +      -       +      +
    186B  LYS*     3.5    17.6    +      -       -      +
    187B  LYS*     3.6    10.9    +      -       +      +
    350B  TYR*     5.5     8.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 184 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  MET*     5.5     2.0    -      -       +      -
    180B  HIS*     3.0    52.5    +      -       +      +
    181B  SER      3.9     1.3    -      -       -      +
    183B  ILE*     1.3    80.3    -      -       +      +
    185B  THR*     1.3    62.8    +      -       -      +
    187B  LYS*     3.2     6.6    +      -       -      +
    188B  LEU*     2.8    27.7    +      -       +      +
    262B  LYS*     4.0     9.9    -      -       +      -
    293B  VAL*     4.1    26.7    -      -       +      -
    349B  ILE*     4.2     7.8    -      -       +      +
    350B  TYR*     3.9    29.4    -      -       +      +
    351B  ALA*     4.5    11.4    -      -       +      -
    353B  ALA*     4.3    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 185 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181B  SER*     2.7    32.0    +      -       -      -
    182B  ILE*     4.2     4.0    -      -       -      -
    184B  ILE*     1.3    72.5    -      -       -      +
    186B  LYS*     1.3    57.2    +      -       -      +
    188B  LEU*     3.0    13.5    +      -       +      +
    189B  LEU*     2.8    35.1    +      -       +      +
    211B  THR*     3.6    27.4    +      -       +      +
    214B  ALA*     4.0    22.2    -      -       +      -
    215B  ILE*     4.0    28.9    -      -       +      -
    262B  LYS*     5.1     2.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 186 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  GLU*     3.0    34.6    +      -       -      +
    117B  ASP*     3.1    25.3    +      -       -      +
    182B  ILE      3.5    11.7    +      -       -      +
    183B  ILE*     3.5    12.8    -      -       -      +
    184B  ILE      3.2     0.2    -      -       -      -
    185B  THR*     1.3    80.6    -      -       -      +
    187B  LYS*     1.3    64.1    +      -       +      +
    189B  LEU*     3.3    13.7    +      -       -      +
    190B  GLU*     3.1    34.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 187 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  ALA*     6.2     1.8    -      -       -      +
    183B  ILE*     3.6     9.3    +      -       +      +
    184B  ILE*     3.2     9.9    +      -       -      +
    186B  LYS*     1.3    80.8    -      -       +      +
    188B  LEU*     1.3    62.1    +      -       -      +
    190B  GLU*     3.2    30.9    +      -       -      +
    191B  LEU*     3.2    24.7    +      -       +      +
    349B  ILE*     3.7    17.3    -      -       +      +
    350B  TYR*     3.7    55.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 188 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184B  ILE*     2.8    17.7    +      -       +      +
    185B  THR*     3.0    19.5    +      -       +      +
    187B  LYS*     1.3    77.2    -      -       -      +
    189B  LEU*     1.3    56.8    +      -       +      +
    190B  GLU      2.9     1.3    +      -       -      -
    191B  LEU      3.2     0.5    +      -       -      -
    192B  TYR*     2.8    64.7    +      -       +      +
    195B  PHE*     4.0    27.4    -      -       +      -
    211B  THR*     5.5     2.0    -      -       +      -
    215B  ILE*     4.6     9.6    -      -       +      -
    260B  LEU*     5.1     4.0    -      -       +      -
    262B  LYS*     6.4     0.7    -      -       +      -
    291B  VAL*     5.6     1.3    -      -       +      -
    293B  VAL*     4.3    26.0    -      -       +      -
    349B  ILE*     3.7    25.8    -      -       +      +
    355B  ALA*     4.2     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 189 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185B  THR*     2.8    34.8    +      -       +      +
    186B  LYS*     3.3     9.4    +      -       -      +
    188B  LEU*     1.3    71.7    -      -       +      +
    190B  GLU*     1.3    59.9    +      -       +      +
    192B  TYR      4.3     9.5    -      -       -      +
    193B  HIS*     4.9     6.2    +      -       -      -
    195B  PHE*     4.3    11.0    -      -       +      -
    214B  ALA*     3.9    23.8    -      -       +      +
    215B  ILE*     3.8    23.1    -      -       +      -
    218B  HIS*     4.0    35.6    +      -       +      -
    219B  TYR*     4.1    27.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 190 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186B  LYS*     3.1    34.3    -      -       +      +
    187B  LYS*     3.6    32.7    +      -       -      +
    188B  LEU      3.0     1.0    -      -       -      -
    189B  LEU*     1.3    82.4    -      -       +      +
    191B  LEU*     1.3    71.2    +      -       +      +
    192B  TYR      3.6     0.4    -      -       -      -
    193B  HIS*     4.1    15.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 191 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187B  LYS*     3.2    18.6    +      -       +      +
    188B  LEU      3.2     1.6    +      -       -      -
    190B  GLU*     1.3    86.5    -      -       +      +
    192B  TYR*     1.3    60.5    +      -       -      +
    193B  HIS*     4.3     8.1    +      -       -      -
    347B  THR*     4.1    15.6    -      -       +      +
    348B  TYR*     3.7     8.7    -      -       +      +
    349B  ILE*     3.1    49.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 192 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188B  LEU*     2.8    36.5    +      -       +      +
    189B  LEU*     4.3     9.0    -      -       -      +
    190B  GLU      3.6     0.4    -      -       -      -
    191B  LEU*     1.3    80.0    -      -       -      +
    193B  HIS*     1.3    68.9    +      -       -      +
    194B  GLY*     3.3    33.4    -      -       -      -
    195B  PHE*     3.6    36.7    -      +       -      -
    219B  TYR*     4.4     5.4    +      -       -      -
    289B  LYS*     3.4     6.4    +      -       -      -
    291B  VAL*     3.3    20.7    -      -       +      +
    347B  THR*     4.9    11.2    -      -       +      -
    349B  ILE*     4.5     3.8    -      -       +      -
    355B  ALA*     4.1    17.0    -      -       +      -
    357B  GLU*     2.5    52.0    +      -       +      +
----------------------------------------------------------
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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