Contacts of the helix formed by residues 154 - 182 (chain A) in PDB entry 1JB0


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 ASN 154 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100A  TYR*     5.2     2.7    -      -       -      -
    101A  GLU*     3.3    13.7    -      -       -      +
    152A  ILE*     3.8     2.1    -      -       -      +
    153A  THR*     1.3    88.5    +      -       -      +
    155A  GLU*     1.3    64.0    +      -       -      +
    156A  PHE*     3.0    22.2    +      -       -      +
    157A  GLN*     2.9    47.5    +      -       -      +
    158A  LEU*     3.6    11.2    +      -       -      +
    238A  LEU*     4.5    14.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  GLY      3.7    11.1    -      -       -      +
     95A  ALA*     3.3    37.4    -      -       +      +
     98A  SER*     4.3    12.5    +      -       -      +
    100A  TYR*     4.8     2.8    -      -       -      +
    101A  GLU*     2.8    44.1    +      -       -      +
    154A  ASN*     1.3    71.7    -      -       -      +
    156A  PHE*     1.3    62.3    +      -       -      +
    158A  LEU*     3.4     5.9    +      -       -      +
    159A  TYR*     3.1    23.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154A  ASN*     3.0    13.7    +      -       -      +
    155A  GLU*     1.3    80.7    -      -       -      +
    157A  GLN*     1.3    61.0    +      -       +      +
    159A  TYR*     3.3    17.0    +      +       -      +
    160A  CYS*     3.0    51.0    +      -       -      -
   1114A  CLA      3.5    64.6    -      +       +      -
----------------------------------------------------------
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Residues in contact with GLN 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  GLY      4.4     0.4    +      -       -      -
    152A  ILE*     3.4    11.8    -      -       +      -
    153A  THR*     2.6    35.3    +      -       -      +
    154A  ASN*     2.9    33.5    +      -       -      +
    156A  PHE*     1.3    78.4    -      -       +      +
    158A  LEU*     1.3    61.5    +      -       -      +
    160A  CYS*     3.3     7.2    +      -       -      +
    161A  THR*     2.8    29.0    +      -       -      -
    238A  LEU*     5.0     2.8    -      -       -      +
    239A  PRO*     3.9    19.2    -      -       -      +
   1112A  CLA      3.1    43.6    +      -       +      +
   1114A  CLA      4.6    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  TYR*     3.6    24.8    -      -       +      +
     94A  GLY*     3.4    36.8    -      -       -      +
     95A  ALA*     3.5     4.9    -      -       +      +
    100A  TYR*     4.3    15.5    -      -       +      -
    147A  TRP*     4.0    28.7    -      -       +      +
    152A  ILE*     3.5    35.2    -      -       +      -
    154A  ASN      4.0     9.2    -      -       -      +
    155A  GLU*     3.4    11.2    +      -       -      +
    156A  PHE      3.3     0.2    -      -       -      -
    157A  GLN*     1.3    77.1    -      -       -      +
    159A  TYR*     1.3    57.8    +      -       -      +
    161A  THR*     3.1     7.6    +      -       -      -
    162A  ALA*     2.9    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  PHE*     3.8    29.4    -      +       -      -
     95A  ALA*     3.9     8.6    -      -       +      +
     96A  LYS*     3.8    27.6    -      -       -      -
    155A  GLU      3.1    14.7    +      -       -      +
    156A  PHE*     3.5    21.3    -      +       -      +
    158A  LEU*     1.3    79.3    -      -       -      +
    160A  CYS*     1.3    60.5    +      -       -      +
    162A  ALA*     3.4     6.9    +      -       -      +
    163A  ILE*     3.1    58.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  PHE*     3.0    55.4    +      -       -      +
    157A  GLN      3.6     2.9    -      -       -      +
    159A  TYR*     1.3    77.6    -      -       -      +
    161A  THR*     1.3    60.9    +      -       -      +
    163A  ILE*     3.4     7.9    +      -       -      +
    164A  GLY*     3.0    24.6    +      -       -      -
   1112A  CLA      3.4    20.5    +      -       -      +
   1114A  CLA      3.8    24.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  TYR*     3.4    40.6    -      -       +      -
    152A  ILE*     4.9     1.2    -      -       -      +
    157A  GLN      2.8    15.8    +      -       -      -
    158A  LEU      3.1     1.8    +      -       -      -
    160A  CYS*     1.3    73.1    -      -       -      +
    162A  ALA*     1.3    60.7    +      -       -      +
    164A  GLY*     3.2     1.9    +      -       -      -
    165A  GLY*     2.8    27.4    +      -       -      -
   1112A  CLA      3.3    28.6    +      -       +      +
   4002A  BCR      3.6    41.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88A  SER*     3.2    38.9    -      -       -      +
     91A  TYR*     4.0     1.7    -      -       -      +
     92A  PHE*     3.7    27.8    -      -       +      +
    158A  LEU      2.9    13.2    +      -       -      +
    159A  TYR*     3.4    12.3    -      -       -      +
    161A  THR*     1.3    77.1    -      -       -      +
    163A  ILE*     1.3    63.5    +      -       +      +
    166A  LEU*     3.1    23.3    +      -       -      +
   1105A  CLA      6.2     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  PHE*     5.8     3.6    -      -       +      -
    159A  TYR*     3.1    48.0    +      -       +      +
    160A  CYS*     3.7     8.1    -      -       -      +
    161A  THR      3.3     0.2    -      -       -      -
    162A  ALA*     1.3    76.7    -      -       +      +
    164A  GLY*     1.3    65.2    +      -       -      +
    166A  LEU*     3.0    18.2    +      -       +      +
    167A  VAL*     2.9    32.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160A  CYS      3.0    15.1    +      -       -      -
    161A  THR      3.2     3.1    +      -       -      -
    163A  ILE*     1.3    78.4    -      -       -      +
    165A  GLY*     1.3    56.4    +      -       -      +
    167A  VAL*     3.3    10.5    +      -       -      +
    168A  MET*     3.0    33.4    +      -       -      +
   1112A  CLA      5.1     1.8    -      -       -      -
   4002A  BCR      3.6    13.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  PHE*     3.7    10.2    -      -       -      +
     88A  SER*     3.9    13.0    -      -       -      -
    161A  THR      2.8    14.1    +      -       -      -
    162A  ALA      3.3     4.0    +      -       -      -
    163A  ILE      3.1     0.4    -      -       -      -
    164A  GLY*     1.3    74.1    -      -       -      +
    166A  LEU*     1.3    58.9    +      -       -      +
    168A  MET*     3.2     6.3    +      -       -      +
    169A  ALA*     2.8    28.9    +      -       -      +
   4002A  BCR      3.6    19.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85A  ILE*     4.3    21.3    -      -       +      -
     88A  SER*     3.2    23.3    -      -       -      +
    162A  ALA      3.1     9.2    +      -       -      +
    163A  ILE*     3.0    19.3    +      -       +      +
    165A  GLY*     1.3    72.1    -      -       -      +
    167A  VAL*     1.3    67.0    +      -       +      +
    169A  ALA*     3.2     5.7    +      -       +      +
    170A  GLY*     3.0    19.2    +      -       -      -
   1105A  CLA      4.0    37.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  ILE*     2.9    31.6    +      -       +      +
    164A  GLY*     3.5     9.9    -      -       -      +
    165A  GLY      3.2     0.2    -      -       -      -
    166A  LEU*     1.3    76.9    -      -       +      +
    168A  MET*     1.3    57.4    +      -       +      +
    170A  GLY*     3.0     4.5    +      -       -      -
    171A  LEU*     2.8    45.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  PHE*     3.8    22.9    -      -       +      -
    164A  GLY      3.0    17.5    +      -       -      +
    165A  GLY      3.4     7.6    -      -       -      +
    167A  VAL*     1.3    81.6    -      -       +      +
    169A  ALA*     1.3    52.1    +      -       -      +
    171A  LEU*     3.2    37.2    -      -       +      -
    172A  MET*     2.6    52.0    +      -       +      +
   1103A  CLA      3.6    30.1    -      -       +      -
   1111A  CLA      4.8     3.8    -      -       +      -
   4002A  BCR      3.9    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  ALA*     3.4    24.7    -      -       +      +
     84A  PHE*     3.8    10.7    -      -       +      +
     85A  ILE*     3.8    19.1    -      -       +      +
    165A  GLY      2.8    16.3    +      -       -      +
    166A  LEU*     3.3    14.8    -      -       +      +
    167A  VAL      3.1     0.2    -      -       -      -
    168A  MET*     1.3    72.9    -      -       -      +
    170A  GLY*     1.3    52.1    +      -       -      +
    172A  MET*     3.2     6.2    +      -       -      +
    173A  LEU*     2.7    37.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  LEU      3.0     9.1    +      -       -      -
    167A  VAL      3.0     6.6    +      -       -      -
    169A  ALA*     1.3    73.3    -      -       -      +
    171A  LEU*     1.3    56.7    +      -       -      +
    173A  LEU*     3.1     9.6    +      -       -      +
    174A  PHE*     2.7    36.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  VAL*     2.8    24.2    +      -       +      +
    168A  MET*     3.2    35.4    -      -       +      +
    170A  GLY*     1.3    74.7    -      -       -      +
    172A  MET*     1.3    67.6    +      -       +      +
    174A  PHE*     3.2     9.7    +      -       +      +
    175A  ALA*     3.1    19.1    +      -       -      +
   1108A  CLA      3.5    38.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  PHE*     3.5    22.3    -      -       +      +
     80A  LEU*     3.3    44.2    -      -       +      -
     81A  ALA*     3.8    13.2    -      -       +      +
     84A  PHE*     4.1    18.4    -      -       +      -
    168A  MET*     2.6    53.9    +      -       +      +
    169A  ALA      3.3     4.7    -      -       -      +
    171A  LEU*     1.3    81.2    -      -       +      +
    173A  LEU*     1.3    64.7    +      -       -      +
    174A  PHE      3.2     0.9    +      -       -      -
    175A  ALA*     3.3    12.7    +      -       -      +
    176A  GLY      3.3     9.0    +      -       -      -
   1108A  CLA      4.4    13.9    -      -       +      -
   1111A  CLA      4.3    22.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  PHE      4.9     0.9    -      -       -      -
     78A  GLY*     4.3    12.3    -      -       -      -
     81A  ALA*     3.9    11.4    -      -       +      +
     85A  ILE*     6.4     0.2    -      -       +      -
    169A  ALA      2.7    20.4    +      -       -      +
    170A  GLY*     3.5     9.9    -      -       -      +
    172A  MET*     1.3    72.7    -      -       -      +
    174A  PHE*     1.3    61.6    +      -       -      +
    176A  GLY*     3.7     1.5    +      -       -      +
    177A  TRP      3.6     3.8    +      -       -      -
   1102A  CLA      4.7    11.7    -      -       +      -
   1107A  CLA      3.6    44.9    -      -       +      -
   1109A  CLA      3.2    48.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  GLY      2.7    20.4    +      -       -      +
    171A  LEU*     3.4    11.0    -      -       +      +
    172A  MET      3.1     0.2    -      -       -      -
    173A  LEU*     1.3    71.8    -      -       -      +
    175A  ALA*     1.3    59.3    +      -       -      +
    177A  TRP*     3.2    41.7    +      +       +      +
    178A  PHE*     2.9    48.0    +      +       +      +
   1108A  CLA      3.2    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  PHE*     3.7    25.8    -      -       +      -
    171A  LEU      3.1     2.9    +      -       -      +
    172A  MET      3.7     3.4    -      -       -      +
    174A  PHE*     1.3    75.8    -      -       -      +
    176A  GLY*     1.3    58.0    +      -       -      +
    178A  PHE*     3.6     8.2    -      -       -      +
    179A  HIS*     2.7    40.6    +      -       +      +
   1108A  CLA      3.6    43.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  SER*     3.2    22.2    +      -       -      -
     77A  PHE*     3.4    24.6    -      -       -      +
    172A  MET      3.3     7.7    +      -       -      -
    173A  LEU      3.7     1.1    +      -       -      -
    174A  PHE      3.2     1.0    -      -       -      -
    175A  ALA*     1.3    81.0    -      -       -      +
    177A  TRP*     1.3    64.3    +      -       -      +
    180A  TYR*     3.2     6.4    +      -       -      +
   1109A  CLA      3.3    21.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  THR*     2.9    34.4    +      -       +      +
    173A  LEU      3.6     1.9    +      -       -      +
    174A  PHE*     3.2    45.2    +      +       +      +
    176A  GLY*     1.3    72.0    -      -       -      +
    178A  PHE*     1.3    74.5    +      +       -      +
    180A  TYR      3.1     1.2    +      -       -      -
    181A  HIS*     2.8    61.6    +      +       +      +
    182A  LYS*     3.4    44.9    -      -       +      -
   1109A  CLA      3.2    59.3    -      +       +      +
----------------------------------------------------------
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Residues in contact with PHE 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  PHE*     2.9    32.6    +      +       +      +
    175A  ALA*     3.6     6.5    -      -       -      +
    177A  TRP*     1.3    94.0    -      +       +      +
    179A  HIS*     1.3    78.1    +      +       -      +
    182A  LYS*     3.0    38.3    +      -       +      +
    183A  ARG*     2.8    49.3    +      -       +      -
   1108A  CLA      3.3    61.7    -      +       +      -
----------------------------------------------------------
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Residues in contact with HIS 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  VAL*     6.1     0.2    -      -       +      -
     70A  ARG*     4.8     3.8    -      -       -      +
     73A  PHE*     4.0    24.4    -      +       +      -
     74A  SER*     3.8     5.7    +      -       -      +
     77A  PHE*     3.9    19.3    -      +       +      -
    175A  ALA*     2.7    27.8    +      -       +      +
    176A  GLY      3.2     2.0    +      -       -      +
    178A  PHE*     1.3    85.8    -      +       -      +
    180A  TYR*     1.3    58.3    +      -       -      +
    183A  ARG      2.8    24.0    +      -       -      -
    184A  ALA*     3.2    21.9    -      -       -      +
    185A  PRO*     3.8     8.4    -      -       +      +
   1108A  CLA      2.3    75.4    +      +       +      -
----------------------------------------------------------
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Residues in contact with TYR 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  PRO*     4.0     5.9    -      -       -      +
     21A  VAL*     3.8    28.8    -      -       +      +
     67A  ASP*     2.8    29.7    +      -       -      -
     70A  ARG*     3.6    27.1    -      -       +      -
     71A  LYS*     3.3    32.5    +      -       +      -
     74A  SER*     3.1    14.8    -      -       -      +
    176A  GLY      3.2     7.3    +      -       -      +
    177A  TRP      3.1     3.2    +      -       -      +
    179A  HIS*     1.3    80.3    -      -       -      +
    181A  HIS*     1.3    72.3    +      +       +      +
    184A  ALA*     3.9    13.6    -      -       -      +
   1109A  CLA      3.3    64.3    +      +       +      -
----------------------------------------------------------
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Residues in contact with HIS 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19A  ASP*     3.0    26.7    -      -       -      +
     20A  PRO*     3.0     6.7    -      -       -      +
     21A  VAL*     2.7    46.8    +      -       +      +
     22A  PRO      3.8     9.6    +      -       -      -
     23A  THR*     3.7    19.9    +      -       -      +
    177A  TRP*     2.8    47.3    +      +       +      +
    180A  TYR*     1.3    80.5    -      +       +      +
    182A  LYS*     1.3    59.9    +      -       +      +
   1109A  CLA      2.4    54.2    +      +       -      -
----------------------------------------------------------
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Residues in contact with LYS 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ASN*     3.3     0.7    -      -       -      -
     19A  ASP*     2.7    52.7    +      -       -      +
     20A  PRO*     4.3     0.2    -      -       -      -
     23A  THR*     5.6     1.7    +      -       -      -
    177A  TRP*     3.4    45.5    +      -       +      -
    178A  PHE*     3.0    32.0    +      -       +      +
    181A  HIS*     1.3    80.8    -      -       -      +
    183A  ARG*     1.3    76.1    +      -       +      +
    184A  ALA      4.0     0.9    -      -       -      -
----------------------------------------------------------
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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