Contacts of the helix formed by residues 153 - 182 (chain A) in PDB entry 1YDI


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 THR 153 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  VAL*     3.8     2.3    -      -       -      +
    152A  GLU*     1.3    86.5    -      -       +      +
    154A  MET*     1.3    58.5    +      -       -      +
    155A  GLU*     3.4    15.6    +      -       -      +
    156A  ASP*     3.0    35.6    +      -       -      +
    157A  LEU*     2.9    26.7    +      -       -      +
    213A  VAL*     3.5     8.2    -      -       -      +
    217A  ASN*     4.3     5.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  THR*     1.3    74.7    -      -       -      +
    155A  GLU*     1.3    71.1    +      -       -      +
    157A  LEU*     3.2    26.6    +      -       -      +
    158A  VAL*     3.0    31.4    +      -       +      +
    210A  LYS*     4.3    13.2    -      -       +      +
    213A  VAL*     3.3    33.5    -      -       +      +
    214A  THR*     3.6    25.1    -      -       -      +
    217A  ASN*     5.1     0.8    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    153A  THR*     3.5    15.2    +      -       -      +
    154A  MET*     1.3    84.0    +      -       -      +
    156A  ASP*     1.3    65.5    +      -       -      +
    158A  VAL*     3.3     9.9    +      -       -      +
    159A  THR*     3.3    23.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  VAL      4.8     7.4    -      -       -      +
    151A  VAL*     3.9    18.6    -      -       +      +
    152A  GLU      4.9     0.5    +      -       -      -
    153A  THR*     3.0    30.9    +      -       -      +
    155A  GLU*     1.3    76.5    -      -       -      +
    157A  LEU*     1.3    60.0    +      -       -      +
    159A  THR*     3.2    10.6    +      -       -      -
    160A  TYR*     2.8    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  VAL*     3.5     9.1    -      -       +      +
    153A  THR      2.9    13.8    +      -       -      +
    154A  MET*     3.2    24.0    +      -       -      +
    156A  ASP*     1.3    77.2    -      -       -      +
    158A  VAL*     1.3    63.1    +      -       +      +
    160A  TYR*     3.2     4.3    +      -       +      -
    161A  THR*     2.9    24.4    +      -       +      +
    206A  ILE*     4.4    22.2    -      -       +      +
    209A  MET*     3.9    40.2    -      -       +      +
    210A  LYS*     3.6    40.8    -      -       +      +
    213A  VAL*     4.6     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154A  MET*     3.0    23.1    +      -       +      +
    155A  GLU*     3.6     9.6    -      -       -      +
    156A  ASP      3.3     0.2    -      -       -      -
    157A  LEU*     1.3    76.9    -      -       +      +
    159A  THR*     1.3    64.0    +      -       -      +
    161A  THR*     3.2     9.2    -      -       +      +
    162A  LYS*     3.0    58.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144A  TYR*     5.2     2.7    -      -       -      +
    155A  GLU      3.3    10.9    +      -       -      -
    156A  ASP*     3.2    14.3    +      -       -      -
    158A  VAL*     1.3    79.2    -      -       -      +
    160A  TYR*     1.3    64.4    +      -       -      +
    162A  LYS*     3.3     7.0    +      -       -      +
    163A  ASN*     2.8    40.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144A  TYR*     2.8    62.4    +      +       -      -
    145A  LEU*     3.5    14.2    -      -       -      +
    147A  VAL*     4.0     7.2    -      -       +      -
    148A  ALA*     3.6    22.7    -      -       +      +
    151A  VAL*     3.8    22.7    -      -       +      -
    156A  ASP      2.8    17.9    +      -       -      +
    157A  LEU*     3.2     7.4    +      -       +      +
    159A  THR*     1.3    76.9    -      -       -      +
    161A  THR*     1.3    60.1    +      -       -      +
    163A  ASN*     3.0     2.6    +      -       -      +
    164A  LEU*     2.8    55.1    +      -       +      +
    205A  LEU*     4.6     0.7    -      -       +      -
    206A  ILE*     4.4     7.6    -      -       +      -
    209A  MET*     3.6    28.5    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    157A  LEU*     2.9    20.2    +      -       +      +
    158A  VAL*     3.2    17.3    -      -       +      +
    160A  TYR*     1.3    74.7    -      -       -      +
    162A  LYS*     1.3    67.8    -      -       +      +
    164A  LEU*     4.6     2.0    -      -       -      +
    165A  GLY*     3.0    29.5    +      -       -      -
    166A  PRO*     4.0     0.3    -      -       -      +
    206A  ILE*     3.8    41.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  VAL*     3.0    41.3    +      -       +      +
    159A  THR*     3.7     6.7    -      -       -      +
    160A  TYR      3.2     0.4    -      -       -      -
    161A  THR*     1.3    82.4    -      -       +      +
    163A  ASN*     1.3    61.3    +      -       -      +
    166A  PRO*     3.2    24.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144A  TYR*     3.5    29.6    +      -       +      +
    159A  THR*     2.8    32.5    +      -       -      +
    160A  TYR      3.0     1.6    +      -       -      +
    162A  LYS*     1.3    83.0    -      -       -      +
    164A  LEU*     1.3    65.5    +      -       -      +
    165A  GLY      3.2     1.3    -      -       -      -
    166A  PRO*     3.7     3.9    -      -       -      +
    167A  GLY*     3.3    18.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141A  ILE*     4.2    22.9    -      -       +      -
    144A  TYR*     3.8    24.4    -      -       +      -
    145A  LEU*     4.0    17.9    -      -       +      -
    160A  TYR*     2.8    47.9    +      -       +      +
    161A  THR*     4.5     2.9    -      -       -      +
    163A  ASN*     1.3    72.0    -      -       -      +
    165A  GLY*     1.3    60.0    +      -       -      +
    167A  GLY*     3.3     1.2    +      -       -      -
    168A  MET*     2.9    43.7    +      -       +      +
    202A  LEU*     3.6    29.6    -      -       +      -
    205A  LEU*     4.0     5.4    -      -       +      -
    206A  ILE*     4.8     1.6    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    161A  THR*     3.0    16.0    +      -       -      -
    164A  LEU*     1.3    78.3    -      -       -      +
    166A  PRO*     1.3    69.5    -      -       -      +
    168A  MET*     3.3     3.5    +      -       -      +
    169A  THR*     3.1    24.8    +      -       -      -
    202A  LEU*     4.4    17.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  THR      4.0     1.3    -      -       -      +
    162A  LYS*     3.2    29.4    -      -       -      +
    163A  ASN      3.7     3.8    -      -       -      +
    165A  GLY*     1.3    89.0    -      -       -      +
    167A  GLY*     1.3    65.3    +      -       -      +
    169A  THR*     3.2     8.3    +      -       -      +
    170A  LYS*     3.0    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  VAL*     5.0     1.6    -      -       -      +
    141A  ILE*     3.6    21.2    -      -       -      +
    163A  ASN      3.3    12.5    +      -       -      -
    164A  LEU*     3.7     3.6    -      -       -      -
    165A  GLY      3.2     0.8    -      -       -      -
    166A  PRO*     1.3    79.7    -      -       -      +
    168A  MET*     1.3    55.9    +      -       -      +
    170A  LYS*     3.3     8.0    +      -       -      +
    171A  MET*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    141A  ILE*     4.0    14.4    -      -       +      +
    164A  LEU*     2.9    35.5    +      -       +      +
    165A  GLY      3.3     4.2    +      -       -      +
    167A  GLY*     1.3    72.2    -      -       -      +
    169A  THR*     1.3    61.0    +      -       -      +
    171A  MET*     3.4    19.1    +      -       -      +
    172A  ALA*     2.8    32.5    +      -       +      +
    195A  MET*     4.3     9.4    -      -       +      -
    198A  VAL*     3.5    23.8    -      -       +      -
    199A  LYS*     5.1     7.6    -      -       +      -
    202A  LEU*     4.1    24.9    -      -       +      -
    237A  MET*     3.8    29.2    -      -       +      -
    241A  ILE*     5.4     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165A  GLY      3.1    14.9    +      -       -      -
    166A  PRO*     3.2    12.9    +      -       -      +
    168A  MET*     1.3    78.6    -      -       -      +
    170A  LYS*     1.3    57.3    +      -       -      +
    172A  ALA*     3.7     6.3    -      -       -      +
    173A  LYS*     3.0    30.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  VAL*     4.6    17.5    -      -       +      -
    166A  PRO      3.0    12.9    +      -       -      +
    167A  GLY*     3.6    10.1    -      -       -      +
    169A  THR*     1.3    75.6    -      -       -      +
    171A  MET*     1.3    66.0    +      -       -      +
    173A  LYS*     3.2    23.3    +      -       +      +
    174A  MET*     3.0    52.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  ILE*     6.1     0.2    -      -       +      -
    137A  VAL*     4.0    18.1    -      -       +      +
    138A  CYS*     4.1    33.7    -      -       -      -
    141A  ILE*     4.0    21.1    -      -       +      -
    167A  GLY      3.0    13.6    +      -       -      +
    168A  MET*     3.6    23.3    -      -       -      +
    170A  LYS*     1.3    77.3    -      -       -      +
    172A  ALA*     1.3    62.5    +      -       -      +
    174A  MET*     3.2     6.7    +      -       +      +
    175A  ILE*     3.0    32.4    +      -       +      +
    195A  MET*     3.1    37.0    -      -       +      -
    198A  VAL*     4.0     7.9    -      -       +      -
    241A  ILE*     4.3    14.8    -      -       +      -
    244A  ILE*     4.6     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168A  MET*     2.8    21.9    +      -       +      +
    169A  THR*     3.7     7.0    -      -       -      +
    171A  MET*     1.3    71.6    -      -       -      +
    173A  LYS*     1.3    58.1    +      -       -      +
    175A  ILE*     3.3     2.1    +      -       -      +
    176A  ASP*     2.8    30.8    +      -       -      +
    195A  MET*     3.8    32.2    -      -       +      +
    199A  LYS*     6.3     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169A  THR*     3.0    19.4    +      -       +      +
    170A  LYS*     3.6    23.2    -      -       +      +
    172A  ALA*     1.3    77.4    -      -       -      +
    174A  MET*     1.3    62.4    +      -       +      +
    176A  ASP*     3.3     5.8    +      -       -      +
    177A  GLU*     2.9    52.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  LYS*     4.0    15.9    -      -       +      +
    134A  ILE*     4.0    44.9    -      -       +      +
    137A  VAL*     3.6    37.7    -      -       +      -
    170A  LYS*     3.0    39.6    +      -       -      +
    171A  MET*     3.2     7.4    +      -       -      +
    173A  LYS*     1.3    77.4    -      -       +      +
    175A  ILE*     1.3    59.1    +      -       -      +
    177A  GLU*     3.9    11.0    -      -       -      +
    178A  ARG*     3.0    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  ILE*     3.6    27.4    -      -       +      -
    138A  CYS*     4.5     2.9    -      -       -      -
    171A  MET*     3.0    20.0    +      -       +      +
    172A  ALA      3.7     3.6    -      -       -      +
    174A  MET*     1.3    74.4    -      -       -      +
    176A  ASP*     1.3    60.5    +      -       -      +
    178A  ARG*     3.2     2.7    +      -       -      +
    179A  GLN*     2.9    30.8    +      -       +      +
    191A  LEU*     4.1    37.6    -      -       +      +
    192A  VAL*     5.6     1.1    -      -       -      -
    195A  MET*     4.1    25.1    -      -       +      -
    244A  ILE*     3.7    26.7    -      -       +      -
    248A  LEU*     4.0    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  ALA      2.8    16.9    +      -       -      +
    173A  LYS*     3.7     7.0    -      -       -      +
    175A  ILE*     1.3    76.0    -      -       -      +
    177A  GLU*     1.3    64.5    +      -       +      +
    179A  GLN*     3.0    28.9    +      -       -      +
    180A  GLN*     3.2    39.8    +      -       -      +
    192A  VAL*     5.7     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173A  LYS*     2.9    54.9    +      -       +      +
    174A  MET*     3.9     9.8    -      -       -      +
    176A  ASP*     1.3    77.8    -      -       +      +
    178A  ARG*     1.3    63.3    +      -       -      +
    180A  GLN*     3.4    18.7    +      -       -      +
    181A  GLU*     3.5    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5A  HIS*     3.5    20.8    +      -       -      -
      6A  THR*     3.9     7.8    -      -       -      +
    127A  ASP*     2.9    43.8    +      -       -      -
    130A  GLU*     5.4     4.6    -      -       -      +
    131A  VAL*     3.3    23.3    -      -       -      +
    134A  ILE*     3.9    19.3    -      -       +      +
    174A  MET      3.0    19.6    +      -       -      +
    175A  ILE*     3.2     6.5    +      -       -      +
    177A  GLU*     1.3    74.5    -      -       -      +
    179A  GLN*     1.3    68.0    +      -       -      +
    181A  GLU*     2.9    21.6    +      -       -      +
    182A  LEU*     3.3    32.2    +      -       +      +
    191A  LEU*     4.8     1.1    -      -       +      -
    248A  LEU*     3.8    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  ILE*     2.9    20.8    +      -       +      +
    176A  ASP*     3.0    33.0    +      -       -      +
    178A  ARG*     1.3    73.3    -      -       -      +
    180A  GLN*     1.3    76.2    +      -       -      +
    181A  GLU      3.2     1.0    +      -       -      -
    182A  LEU*     3.2    19.0    +      -       -      -
    188A  ARG*     2.9    68.3    +      -       -      +
    191A  LEU*     4.2    20.2    -      -       +      +
    192A  VAL*     3.8    24.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  ARG*     4.2    10.9    +      -       -      +
    176A  ASP*     3.2    39.8    +      -       -      +
    177A  GLU*     3.6    14.0    -      -       -      +
    178A  ARG      3.1     0.8    -      -       -      -
    179A  GLN*     1.3    88.4    -      -       -      +
    181A  GLU*     1.3    61.5    +      -       +      +
    182A  LEU      4.4     2.6    -      -       -      +
    188A  ARG*     4.0    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  THR*     3.2    17.8    -      -       +      -
      7A  ARG*     2.8    44.9    +      -       -      +
      8A  THR*     2.9    43.2    +      -       -      -
    177A  GLU      3.5    10.0    +      -       -      +
    178A  ARG*     2.9    18.8    +      -       -      +
    180A  GLN*     1.3    80.1    -      -       -      +
    182A  LEU*     1.3    61.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5A  HIS*     3.9    24.5    -      -       +      +
      6A  THR*     4.5     1.3    -      -       +      -
      7A  ARG*     4.4     6.9    +      -       -      -
    178A  ARG*     3.5    46.0    -      -       +      +
    179A  GLN*     3.2    10.8    +      -       -      +
    180A  GLN      4.4     2.8    -      -       -      +
    181A  GLU*     1.3    80.6    -      -       -      +
    183A  THR*     1.3    61.6    +      -       -      +
    184A  HIS*     4.3     5.4    -      -       +      +
    187A  HIS*     4.3    19.3    -      -       +      +
    188A  ARG*     3.6    29.2    +      -       +      -
    191A  LEU*     3.7    30.3    -      -       +      -
    247A  VAL      5.9     2.2    -      -       -      +
    248A  LEU*     6.1     1.3    -      -       +      -
----------------------------------------------------------
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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