Contacts of the helix formed by residues 166 - 194 (chain A) in PDB entry 2GER


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 LEU 166 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  VAL*     3.3    30.3    -      -       +      -
    163A  GLU*     2.9     6.7    +      -       +      +
    165A  ASP*     1.3    94.0    +      -       -      +
    167A  ILE*     1.3    57.4    +      -       -      +
    169A  ALA*     2.9    24.6    +      -       +      +
    170A  VAL*     2.8    23.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  ARG*     3.9    39.4    +      -       +      +
    120A  CYS      5.2     1.1    -      -       -      +
    121A  MET*     3.8    27.6    -      -       +      -
    134A  VAL*     3.8    24.0    -      -       +      -
    135A  TYR*     4.5     1.6    -      -       -      -
    136A  ALA*     3.9    21.3    -      -       +      +
    162A  VAL*     4.5     4.9    -      -       +      +
    163A  GLU      4.6     1.1    -      -       -      +
    164A  GLU*     2.7    40.5    +      -       -      +
    166A  LEU*     1.3    70.0    -      -       -      +
    168A  ASP*     1.3    56.6    +      -       -      +
    170A  VAL*     3.6     8.1    -      -       +      -
    171A  THR*     2.7    24.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  ARG*     3.1    22.7    +      -       -      -
    164A  GLU      4.1     0.4    +      -       -      -
    165A  ASP*     3.5     9.2    +      -       -      +
    166A  LEU      3.0     1.8    +      -       -      -
    167A  ILE*     1.3    75.5    -      -       -      +
    169A  ALA*     1.3    64.3    +      -       -      +
    171A  THR*     2.5    18.8    +      -       -      -
    172A  GLY      3.6     3.1    +      -       -      -
    262A  CYS*     3.5    17.2    -      -       -      +
    265A  THR*     3.0    26.4    -      -       +      +
    266A  ARG*     3.2    34.1    +      -       +      +
    269A  GLN*     3.1    27.8    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    165A  ASP      4.5     0.8    +      -       -      +
    166A  LEU*     2.9    15.3    +      -       +      +
    168A  ASP*     1.3    77.2    -      -       -      +
    170A  VAL*     1.3    58.5    +      -       +      +
    172A  GLY*     2.6    30.7    +      -       -      -
    173A  LEU*     3.2     5.5    +      -       -      +
    258A  VAL*     5.5     3.9    -      -       +      +
    262A  CYS*     3.6    18.2    -      -       -      +
    266A  ARG*     4.8     6.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  MET*     4.8     4.5    -      -       +      -
    134A  VAL*     4.2    28.5    -      -       +      -
    162A  VAL*     4.9     7.0    -      -       +      -
    166A  LEU*     2.8    33.0    -      -       +      +
    167A  ILE*     3.6    12.1    -      -       +      +
    169A  ALA*     1.3    76.2    -      -       +      +
    171A  THR*     1.3    62.9    +      -       -      +
    172A  GLY      3.1     0.9    +      -       -      -
    173A  LEU*     3.1    16.9    +      -       +      +
    174A  SER*     3.1    33.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ALA*     5.0     7.9    -      -       +      -
     98A  GLY      5.3     2.9    -      -       -      +
    119A  ARG*     5.6     0.4    -      -       -      +
    121A  MET*     2.9    53.6    -      -       +      -
    167A  ILE*     2.7    14.9    +      -       +      +
    168A  ASP*     2.5    27.2    +      -       -      -
    170A  VAL*     1.3    77.4    -      -       -      +
    172A  GLY*     1.3    63.4    +      -       -      +
    175A  GLY*     3.1     6.4    +      -       -      +
    176A  SER*     3.1    23.0    +      -       -      -
    261A  SER*     3.8     2.4    +      -       -      -
    265A  THR*     4.0    18.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168A  ASP      3.6     1.6    +      -       -      -
    169A  ALA      2.6    17.9    +      -       -      -
    171A  THR*     1.3    77.7    +      -       -      +
    173A  LEU*     1.3    66.3    +      -       -      +
    176A  SER*     3.4     4.0    -      -       -      -
    180A  TYR*     3.3    20.3    +      -       -      -
    258A  VAL*     4.0    13.2    -      -       -      -
    261A  SER*     3.2    24.7    -      -       -      -
    262A  CYS*     4.0     4.2    -      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    169A  ALA      3.2     7.1    +      -       -      +
    170A  VAL*     3.1    10.9    +      -       +      +
    172A  GLY*     1.3    83.0    -      -       -      +
    174A  SER*     1.3    59.1    +      -       -      +
    175A  GLY      2.9     2.5    +      -       -      -
    177A  GLY*     2.7    28.1    +      -       -      -
    180A  TYR*     5.3     1.1    -      -       +      -
    258A  VAL*     3.2    30.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  MET*     5.1     4.5    +      -       -      +
    123A  ASN*     2.9    25.7    -      -       -      +
    132A  ALA*     3.7    32.6    +      -       -      -
    170A  VAL*     3.1    25.4    +      -       -      +
    171A  THR*     5.0     0.3    -      -       -      -
    173A  LEU*     1.3    81.9    -      -       -      +
    175A  GLY*     1.3    64.3    +      -       -      +
    177A  GLY*     4.7     1.1    -      -       -      +
    178A  PRO*     3.2     8.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  MET*     4.3    15.5    -      -       -      -
    122A  THR      4.6     1.9    -      -       -      +
    123A  ASN*     3.7    14.5    -      -       -      +
    170A  VAL      3.4     1.2    +      -       -      -
    171A  THR*     3.1    20.4    +      -       -      -
    173A  LEU      2.9     3.4    +      -       -      -
    174A  SER*     1.3    82.6    +      -       -      +
    176A  SER*     1.3    58.9    +      -       -      +
    178A  PRO*     3.5     9.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171A  THR      3.1     4.8    +      -       -      -
    172A  GLY      3.4     3.8    -      -       -      -
    173A  LEU      3.2     0.4    +      -       -      -
    175A  GLY*     1.3    72.7    -      -       -      +
    177A  GLY*     1.3    55.8    +      -       -      +
    178A  PRO*     3.0     3.9    -      -       -      +
    179A  ALA*     2.4    42.8    +      -       -      +
    180A  TYR*     3.2    33.9    +      -       -      -
    261A  SER*     2.9    19.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  GLY      3.9     0.8    +      -       -      -
    173A  LEU      2.7    23.3    +      -       -      -
    174A  SER*     4.8     0.9    -      -       -      -
    176A  SER*     1.3    70.8    -      -       -      +
    178A  PRO*     1.3    69.6    -      -       -      +
    180A  TYR*     2.8    30.9    +      -       -      +
    181A  ALA*     2.9    12.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123A  ASN*     3.4    32.1    -      -       +      +
    124A  THR*     4.0     8.3    -      -       -      +
    125A  PRO*     3.5    21.8    -      -       +      -
    174A  SER      3.2    16.8    -      -       -      +
    175A  GLY      3.5     4.9    -      -       -      +
    176A  SER      2.8     6.3    -      -       -      +
    177A  GLY*     1.3    87.6    -      -       -      +
    179A  ALA*     1.3    55.5    +      -       -      +
    181A  ALA*     3.0    23.0    -      -       +      +
    182A  PHE*     3.1    27.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  SER*     2.4    30.8    +      -       -      +
    178A  PRO*     1.3    67.8    -      -       -      +
    180A  TYR*     1.3    67.6    +      -       +      +
    181A  ALA      3.0     1.8    -      -       -      -
    182A  PHE*     3.8    14.4    -      -       +      +
    183A  THR*     3.2    24.4    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    172A  GLY      3.3    10.7    +      -       -      -
    173A  LEU*     4.9     1.1    -      -       -      -
    176A  SER*     3.2    37.7    -      -       -      -
    177A  GLY*     2.8    21.5    +      -       -      +
    179A  ALA*     1.3    76.3    -      -       +      +
    181A  ALA*     1.3    57.5    +      -       -      +
    183A  THR*     3.3     8.0    +      -       -      -
    184A  ALA*     3.0    26.2    +      -       -      +
    254A  LEU*     4.7    23.7    -      -       +      +
    257A  ALA*     2.8    49.0    +      -       +      -
    258A  VAL*     4.3    10.5    -      -       +      -
    261A  SER*     3.2    10.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177A  GLY      2.9     9.5    +      -       -      +
    178A  PRO*     3.0    15.0    -      -       +      +
    180A  TYR*     1.3    76.2    -      -       -      +
    182A  PHE*     1.3    66.5    +      -       +      +
    184A  ALA*     2.8    24.7    +      -       -      +
    185A  LEU*     2.9    20.0    +      -       +      +
    210A  LEU*     4.7    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  THR*     5.1     8.1    -      -       -      -
    125A  PRO*     5.9     2.2    -      -       +      -
    178A  PRO*     3.1    31.6    +      -       +      -
    179A  ALA*     3.4    14.1    +      -       +      +
    181A  ALA*     1.3    79.3    -      -       +      +
    183A  THR*     1.3    61.9    +      -       -      +
    185A  LEU*     4.1     8.4    -      -       +      +
    186A  ASP*     3.1    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  ALA      3.2    10.7    +      -       -      -
    180A  TYR*     3.7     9.6    -      -       -      -
    181A  ALA      3.0     0.8    -      -       -      -
    182A  PHE*     1.3    76.7    -      -       -      +
    184A  ALA*     1.3    71.4    +      -       -      +
    185A  LEU      3.2     0.2    +      -       -      -
    186A  ASP*     3.4     4.9    +      -       -      +
    187A  ALA*     3.1    22.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180A  TYR      3.0    13.9    +      -       -      +
    181A  ALA*     2.8    14.8    +      -       -      +
    183A  THR*     1.3    76.2    -      -       -      +
    185A  LEU*     1.3    64.6    +      -       +      +
    187A  ALA*     2.9    27.4    -      -       -      +
    188A  LEU*     2.9    18.3    +      -       +      +
    210A  LEU*     5.0     5.4    -      -       +      -
    250A  PHE*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  ALA*     2.9    15.8    +      -       +      +
    182A  PHE*     4.1     8.1    -      -       +      +
    184A  ALA*     1.3    77.7    -      -       +      +
    186A  ASP*     1.3    68.1    +      -       -      +
    187A  ALA      2.8     2.4    +      -       -      -
    188A  LEU*     2.9    25.5    +      -       +      -
    189A  ALA*     2.6    27.9    +      -       -      +
    203A  VAL*     5.0    10.3    -      -       +      +
    206A  GLY*     4.0     5.8    -      -       -      +
    207A  ALA*     3.6    34.3    -      -       +      +
    210A  LEU*     3.5    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  PHE      3.1    17.5    +      -       -      +
    183A  THR*     3.8     5.6    -      -       -      +
    185A  LEU*     1.3    77.8    -      -       -      +
    187A  ALA*     1.3    67.2    +      -       -      +
    189A  ALA*     3.5     4.9    -      -       -      +
    190A  ASP*     3.1    29.3    +      -       -      +
    199A  ARG*     3.2    21.3    +      -       -      +
    225E  GLY*     5.7     5.0    -      -       -      -
    228E  LYS*     5.2     3.6    +      -       -      +
    229E  ASP*     5.0     1.6    -      -       -      +
    251E  ARG*     4.7    13.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  THR*     3.1    13.6    +      -       +      +
    184A  ALA*     2.9    17.3    -      -       -      +
    185A  LEU      2.8     0.6    +      -       -      -
    186A  ASP*     1.3    78.4    +      -       -      +
    188A  LEU*     1.3    52.5    +      -       +      +
    190A  ASP*     2.5    34.0    +      -       -      +
    191A  GLY*     2.9    10.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184A  ALA*     2.9    15.5    +      -       +      +
    185A  LEU*     2.9    38.6    +      -       +      +
    187A  ALA*     1.3    72.5    -      -       +      +
    189A  ALA*     1.3    53.6    +      -       -      +
    191A  GLY*     3.4     2.8    -      -       -      +
    192A  GLY*     2.5    36.2    +      -       -      -
    202A  ALA*     4.7     1.3    -      -       -      +
    206A  GLY*     4.8    18.2    -      -       -      +
    210A  LEU*     5.3     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185A  LEU      2.6    20.2    +      -       -      +
    186A  ASP*     3.5     4.0    -      -       -      +
    188A  LEU*     1.3    70.6    -      -       -      +
    190A  ASP*     1.3    52.2    +      -       -      +
    192A  GLY      3.1     0.7    +      -       -      -
    193A  VAL*     2.7    39.0    +      -       -      +
    199A  ARG*     3.0    28.3    -      -       -      +
    202A  ALA*     3.4    14.5    +      -       +      +
    203A  VAL*     3.5    31.1    -      -       +      +
    206A  GLY*     6.0     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  ASP*     3.1    17.2    +      -       -      +
    187A  ALA*     2.5    18.5    +      -       -      +
    189A  ALA*     1.3    72.6    -      -       -      +
    191A  GLY*     1.3    49.9    -      -       -      +
    193A  VAL*     3.1     3.7    +      -       -      -
    194A  LYS*     2.6    32.8    +      -       -      +
    199A  ARG*     2.3    44.7    +      -       -      +
    228E  LYS*     3.7    28.0    +      -       -      +
    229E  ASP*     4.2     3.1    -      -       -      +
    239E  ILE*     3.0    20.1    -      -       +      +
    242E  LEU*     5.4     1.9    -      -       -      +
    246E  GLU*     5.2     1.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  ALA      2.9    10.2    +      -       -      -
    188A  LEU*     3.4     4.5    -      -       -      -
    190A  ASP*     1.3    73.1    -      -       -      +
    192A  GLY*     1.3    68.9    +      -       -      +
    194A  LYS*     3.3    14.9    +      -       -      +
    195A  MET*     3.3    17.7    -      -       -      +
    243E  HIS*     6.1     3.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  LEU      2.5    21.7    +      -       -      -
    189A  ALA      3.4     1.6    -      -       -      -
    191A  GLY*     1.3    79.1    -      -       -      +
    193A  VAL*     1.3    60.8    +      -       -      +
    195A  MET*     2.9    19.3    +      -       -      +
    197A  LEU*     3.7    24.2    -      -       -      +
    202A  ALA*     4.0     9.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  ALA      2.7    22.8    +      -       -      +
    190A  ASP      3.3     6.1    -      -       -      +
    192A  GLY*     1.3    66.2    -      -       -      +
    194A  LYS*     1.3    54.4    +      -       -      +
    195A  MET      2.7     9.6    +      -       -      -
    196A  GLY      3.1     1.7    +      -       -      -
    197A  LEU      3.1    17.0    -      -       -      +
    198A  PRO      3.9    10.5    -      -       -      +
    199A  ARG*     3.8    32.3    -      -       -      +
    202A  ALA*     4.0     1.2    -      -       +      +
    232E  SER*     5.1     4.7    -      -       -      +
    233E  SER      4.3     2.0    -      -       -      -
    234E  PRO*     2.5    57.9    -      -       +      +
    239E  ILE*     3.2    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  ASP      2.6    19.3    +      -       -      +
    191A  GLY*     3.9    10.8    -      -       -      +
    192A  GLY      3.1     1.4    +      -       -      -
    193A  VAL*     1.3    71.6    -      -       -      +
    195A  MET*     1.3    79.0    +      -       -      +
    234E  PRO      4.4     1.8    -      -       -      -
    235E  GLY      4.9     4.5    -      -       -      +
    239E  ILE*     3.3    38.6    -      -       +      +
    240E  HIS*     3.7    38.4    +      -       +      +
    243E  HIS*     3.4    45.0    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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