Contacts of the helix formed by residues 165 - 192 (chain B) in PDB entry 3H8E


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 GLY 165 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  HIS*     3.5    33.6    +      -       -      -
    161B  ALA*     4.7     0.4    -      -       -      -
    162B  ASP*     3.1    15.0    +      -       -      -
    164B  ALA*     1.3    77.2    -      -       -      +
    166B  GLN*     1.3    64.0    +      -       -      +
    167B  ALA      3.3     2.0    -      -       -      -
    168B  GLU*     3.1     9.4    +      -       -      +
    169B  VAL*     2.9    26.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 166 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  VAL*     3.4    42.2    +      -       +      -
      6B  LYS*     4.1     3.8    -      -       -      +
      7B  SER*     3.3    26.3    -      -       -      +
    161B  ALA*     4.7     2.0    -      -       +      -
    162B  ASP      3.3     9.0    +      -       -      +
    163B  LYS*     3.3    18.6    +      -       -      +
    164B  ALA      3.4     0.2    -      -       -      -
    165B  GLY*     1.3    76.3    -      -       -      +
    167B  ALA*     1.3    63.1    +      -       -      +
    169B  VAL*     3.3     4.5    +      -       -      +
    170B  GLU*     2.9    45.3    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    163B  LYS      4.8     0.6    +      -       -      -
    164B  ALA      4.9     2.8    +      -       -      +
    165B  GLY      3.3     0.8    +      -       -      -
    166B  GLN*     1.3    80.1    -      -       -      +
    168B  GLU*     1.3    64.9    +      -       +      +
    170B  GLU*     3.3    13.7    +      -       -      +
    171B  ARG*     2.9    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 168 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  ASP*     5.9     0.7    -      -       -      +
    123B  HIS*     3.6    26.6    -      -       +      +
    124B  TYR*     3.7    14.5    -      -       +      +
    164B  ALA      5.4     2.7    -      -       -      +
    165B  GLY*     3.1     7.9    +      -       -      +
    167B  ALA*     1.3    80.2    -      -       +      +
    169B  VAL*     1.3    62.0    +      -       -      +
    171B  ARG*     3.3    40.0    +      -       -      +
    172B  ALA*     2.9    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 169 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  VAL*     3.6    27.8    -      -       +      -
    123B  HIS*     3.5    26.9    -      -       +      +
    127B  TYR*     3.7    31.9    -      -       +      -
    159B  LEU*     4.1    13.7    -      -       +      -
    161B  ALA*     3.9    20.2    -      -       +      -
    165B  GLY      2.9    15.5    +      -       -      +
    166B  GLN      3.8     6.1    -      -       -      +
    168B  GLU*     1.3    76.5    -      -       -      +
    170B  GLU*     1.3    55.5    +      -       -      +
    172B  ALA*     3.2     3.2    +      -       -      +
    173B  VAL*     2.9    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 170 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  VAL*     3.7    31.3    +      -       +      +
    166B  GLN*     2.9    44.3    +      -       -      +
    167B  ALA*     3.6    11.9    -      -       -      +
    169B  VAL*     1.3    74.7    -      -       -      +
    171B  ARG*     1.3    59.6    -      -       -      +
    173B  VAL*     3.3     5.0    +      -       -      +
    174B  LYS*     2.9    27.4    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    124B  TYR*     3.5    34.3    +      -       -      +
    167B  ALA      2.9    15.8    +      -       -      +
    168B  GLU*     3.3    33.0    +      -       -      +
    170B  GLU*     1.3    76.8    -      -       -      +
    172B  ALA*     1.3    62.3    +      -       -      +
    174B  LYS*     3.3    10.3    +      -       +      +
    175B  HIS*     3.0    48.5    +      -       +      +
    497B  ALA      3.0    28.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 172 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  TYR*     3.4    39.8    -      -       +      +
    127B  TYR*     3.8    10.5    -      -       +      -
    128B  ARG*     3.5    18.8    -      -       -      +
    168B  GLU      2.9    14.1    +      -       -      +
    169B  VAL      3.2     7.6    +      -       -      +
    171B  ARG*     1.3    75.7    -      -       -      +
    173B  VAL*     1.3    56.8    +      -       -      +
    175B  HIS      3.4     0.2    +      -       -      -
    176B  ALA*     2.8    33.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 173 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3B  LEU*     2.9    56.1    -      -       +      +
      5B  VAL*     4.1    10.8    -      -       +      -
    127B  TYR*     5.4     0.7    -      -       +      -
    131B  ALA*     4.3     6.7    -      -       +      -
    159B  LEU*     3.8    23.3    -      -       +      -
    169B  VAL*     2.9    23.9    +      -       +      +
    170B  GLU*     3.7     7.2    -      -       -      +
    172B  ALA*     1.3    72.9    -      -       +      +
    174B  LYS*     1.4    57.3    +      -       -      +
    177B  SER*     2.8    40.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 174 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170B  GLU      2.9    14.3    +      -       -      +
    171B  ARG*     3.3    15.0    +      -       +      +
    173B  VAL*     1.4    77.5    -      -       -      +
    175B  HIS*     1.3    73.7    +      -       +      +
    177B  SER*     3.4     4.8    +      -       -      -
    178B  ALA*     3.2    22.9    +      -       -      +
    306B  GLU*     4.9     9.7    +      -       -      +
    307B  LEU*     4.0    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 175 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  TYR*     2.5    27.8    +      -       -      +
    128B  ARG*     3.7    17.7    -      -       -      +
    171B  ARG*     3.0    30.7    +      -       +      +
    174B  LYS*     1.3    83.5    -      -       +      +
    176B  ALA*     1.4    66.9    +      -       -      +
    178B  ALA*     3.3     3.5    +      -       -      +
    179B  ILE*     3.0    29.1    +      -       -      +
    307B  LEU*     3.8    24.7    -      -       +      +
    492B  LEU*     3.8    31.4    -      -       +      +
    497B  ALA*     3.6    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 176 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  ARG*     3.8    13.3    -      -       -      +
    131B  ALA*     3.4    30.1    -      -       +      -
    132B  GLU*     3.5    18.2    -      -       -      +
    135B  LEU*     4.3     1.3    -      -       -      +
    172B  ALA      2.8    23.9    +      -       -      +
    173B  VAL      4.0     0.7    -      -       -      +
    175B  HIS*     1.4    74.1    -      -       -      +
    177B  SER*     1.3    56.9    +      -       -      +
    179B  ILE*     3.7     8.8    -      -       -      +
    180B  ALA*     2.7    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 177 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3B  LEU*     4.3     1.7    -      -       -      +
    135B  LEU*     3.2    24.9    -      -       -      +
    173B  VAL*     2.8    34.0    +      -       -      +
    174B  LYS*     3.8     5.8    -      -       -      -
    175B  HIS      3.2     0.2    -      -       -      -
    176B  ALA*     1.3    77.2    -      -       -      +
    178B  ALA*     1.3    58.5    +      -       -      +
    180B  ALA*     3.8     0.9    -      -       -      +
    181B  THR*     2.9    35.3    +      -       -      -
    306B  GLU*     3.9    10.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 178 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174B  LYS      3.2     7.0    +      -       -      +
    175B  HIS      3.7     6.3    -      -       -      +
    177B  SER*     1.3    76.7    -      -       -      +
    179B  ILE*     1.3    57.3    +      -       +      +
    181B  THR      3.3     0.5    +      -       -      -
    182B  GLY      2.9    24.9    +      -       -      -
    303B  ALA*     3.4    22.5    -      -       +      +
    306B  GLU*     2.7    27.5    +      -       -      +
    307B  LEU*     3.5    37.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 179 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  ARG*     3.5    35.4    -      -       -      +
    132B  GLU*     3.3    30.5    -      -       -      +
    175B  HIS*     3.0    24.5    +      -       +      +
    176B  ALA*     3.7     6.3    -      -       -      +
    178B  ALA*     1.3    75.9    -      -       -      +
    180B  ALA*     1.4    57.8    +      -       -      +
    182B  GLY*     3.2     2.4    +      -       -      -
    183B  MET*     2.7    36.5    +      -       +      +
    303B  ALA*     4.4     4.5    -      -       -      -
    484B  VAL*     3.8     3.5    -      -       +      +
    485B  PRO*     3.8    27.1    -      -       +      +
    488B  THR*     3.7    33.2    -      -       +      -
    489B  GLN      5.2     0.7    -      -       -      +
    492B  LEU*     5.0     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 180 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  GLU*     4.7     5.8    -      -       +      +
    135B  LEU*     3.6    30.5    -      -       +      -
    136B  ASP*     4.0    18.3    -      -       +      +
    176B  ALA      2.7    22.0    +      -       -      +
    177B  SER      4.0     2.7    -      -       -      +
    179B  ILE*     1.4    74.4    -      -       -      +
    181B  THR*     1.3    56.0    +      -       -      +
    183B  MET*     3.3    11.7    +      -       -      +
    184B  ALA*     2.9    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 181 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  SER*     2.9    19.6    +      -       -      -
    180B  ALA*     1.3    74.4    -      -       -      +
    182B  GLY*     1.3    64.1    +      -       -      +
    184B  ALA*     3.3    14.6    +      -       -      +
    185B  PHE*     3.3    13.3    +      -       -      +
    302B  ARG*     3.6    27.5    +      -       +      +
    306B  GLU*     3.7    19.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 182 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178B  ALA      2.9    15.0    +      -       -      -
    179B  ILE      3.6     3.1    -      -       -      -
    181B  THR*     1.3    76.9    -      -       -      +
    183B  MET*     1.3    61.6    +      -       -      +
    185B  PHE*     3.2     2.8    +      -       -      +
    186B  THR*     3.0    24.7    +      -       -      -
    299B  GLY*     3.2    34.3    -      -       -      -
    302B  ARG*     4.2     8.9    -      -       -      +
    484B  VAL*     4.3     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 183 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  GLU*     3.3    32.5    -      -       +      +
    136B  ASP*     3.7    31.2    -      -       -      +
    179B  ILE*     2.7    27.8    +      -       -      +
    180B  ALA*     3.6     6.5    -      -       -      +
    181B  THR      3.3     0.2    -      -       -      -
    182B  GLY*     1.3    72.7    -      -       -      +
    184B  ALA*     1.3    58.6    +      -       -      +
    186B  THR*     3.3     2.2    +      -       -      -
    187B  ARG*     2.8    35.9    +      -       -      +
    481B  GLY*     2.9    48.2    -      -       -      +
    482B  ARG*     5.2     0.4    -      -       -      -
    484B  VAL*     3.7    14.6    -      -       +      +
    485B  PRO*     3.7     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 184 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  ASP*     5.1     1.1    +      -       -      +
    139B  TYR*     3.7    24.6    -      -       +      -
    180B  ALA      2.9    17.0    +      -       -      +
    181B  THR*     3.6     8.7    -      -       -      +
    182B  GLY      3.3     0.4    -      -       -      -
    183B  MET*     1.3    76.5    -      -       -      +
    185B  PHE*     1.3    55.5    +      -       -      +
    187B  ARG*     3.4     1.1    +      -       -      +
    188B  ASP*     2.9    38.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 185 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181B  THR      3.3     8.3    +      -       -      +
    182B  GLY      3.2     7.8    +      -       -      +
    184B  ALA*     1.3    75.2    -      -       -      +
    186B  THR*     1.3    64.4    +      -       -      +
    188B  ASP*     3.3     8.8    +      -       +      +
    189B  LEU*     3.1    40.5    +      -       +      +
    205B  GLN*     4.0    25.8    -      -       +      -
    209B  LEU*     4.9     8.1    -      -       +      -
    298B  PHE*     2.5    77.6    -      +       +      -
    299B  GLY*     3.6     4.3    -      -       -      -
    302B  ARG*     3.3    47.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 186 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182B  GLY      3.0    13.0    +      -       -      -
    183B  MET*     3.5     8.1    -      -       -      -
    185B  PHE*     1.3    76.6    -      -       -      +
    187B  ARG*     1.4    59.2    +      -       -      +
    189B  LEU*     3.3     1.3    +      -       -      -
    190B  GLY*     2.9    25.1    +      -       -      -
    292B  CYS*     4.7     6.6    -      -       +      +
    295B  ALA*     2.8    39.5    +      -       +      +
    296B  SER*     3.8    17.7    -      -       -      +
    299B  GLY*     3.3     8.7    -      -       -      -
    479B  ALA*     4.7     2.0    -      -       +      +
    480B  THR      4.2    14.8    -      -       -      +
    481B  GLY*     5.2     2.0    -      -       -      -
    483B  PRO*     5.4     2.0    -      -       +      -
    484B  VAL*     3.4    15.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 187 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136B  ASP*     2.8    50.1    +      -       -      -
    139B  TYR*     3.3    59.3    +      -       +      +
    183B  MET      2.8    25.4    +      -       -      +
    186B  THR*     1.4    71.7    -      -       -      +
    188B  ASP*     1.3    61.6    +      -       -      +
    190B  GLY*     3.3     0.5    +      -       -      -
    191B  ASN*     2.8    36.4    +      -       -      +
    479B  ALA*     3.2    29.5    +      -       +      +
    480B  THR*     3.4    29.2    -      -       -      +
    481B  GLY*     4.1     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 188 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139B  TYR*     2.6    35.4    +      -       -      -
    140B  VAL      4.7     2.3    -      -       -      +
    141B  PHE*     3.6    12.4    -      -       -      -
    143B  ARG*     3.4    26.6    +      -       -      +
    184B  ALA*     2.9    21.8    +      -       -      +
    185B  PHE*     3.6     8.3    -      -       +      +
    187B  ARG*     1.3    77.9    -      -       -      +
    189B  LEU*     1.4    64.5    +      -       +      +
    192B  LEU*     3.0    31.5    +      -       +      +
----------------------------------------------------------
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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  PHE*     3.1    50.3    +      -       +      +
    186B  THR      3.8     3.6    -      -       -      +
    188B  ASP*     1.4    81.9    -      -       +      +
    190B  GLY*     1.3    64.2    +      -       -      +
    192B  LEU*     3.5    13.8    +      -       +      +
    197B  CYS*     3.7    19.3    -      -       -      -
    201B  PHE*     3.9    27.8    -      -       +      -
    202B  LEU*     4.1    10.1    -      -       +      -
    205B  GLN*     4.1    18.2    -      -       +      +
    291B  MET*     4.4    10.6    -      -       +      +
    295B  ALA*     4.1    15.3    -      -       +      -
    298B  PHE*     3.5    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 190 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186B  THR      2.9    15.0    +      -       -      -
    187B  ARG      3.8     1.6    -      -       -      -
    189B  LEU*     1.3    79.1    -      -       -      +
    191B  ASN*     1.3    65.2    +      -       -      +
    192B  LEU      3.4     6.4    +      -       -      +
    291B  MET*     5.3     7.1    -      -       -      +
    292B  CYS*     4.3    22.8    -      -       -      -
    295B  ALA*     4.5     2.6    -      -       -      +
    479B  ALA*     4.5     5.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 191 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139B  TYR*     3.1    28.5    +      -       -      -
    141B  PHE*     3.7    34.6    -      -       +      +
    144B  PHE*     5.3     0.2    -      -       -      -
    187B  ARG*     2.8    27.2    +      -       -      +
    190B  GLY*     1.3    73.7    -      -       -      +
    192B  LEU*     1.4    64.8    +      -       -      +
    193B  PRO*     3.4     3.3    -      -       -      +
    478B  GLY*     3.5    10.4    -      -       -      -
    479B  ALA*     3.0    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 192 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141B  PHE*     3.8     9.2    -      -       +      -
    143B  ARG*     3.7    27.1    -      -       -      +
    144B  PHE*     3.9    23.6    -      -       +      -
    188B  ASP*     3.0    26.4    +      -       +      +
    189B  LEU*     3.7    15.0    -      -       +      +
    190B  GLY      3.3     8.8    -      -       -      +
    191B  ASN*     1.4    77.5    -      -       -      +
    193B  PRO*     1.3    74.8    -      -       +      +
    194B  PRO*     3.8     1.6    -      -       -      +
    196B  LEU*     4.9     6.5    -      -       +      -
    197B  CYS*     3.7    17.7    -      -       +      +
    201B  PHE*     3.6    38.6    -      -       +      -
----------------------------------------------------------
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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