Contacts of the helix formed by residues 157 - 184 (chain A) in PDB entry 2OU6


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 157 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147A  LEU      4.0     8.6    +      -       -      +
    148A  ALA*     4.0    13.5    +      -       -      +
    149A  GLU      3.3    19.7    -      -       -      +
    150A  PRO*     4.2     2.5    -      -       +      -
    151A  LEU*     4.2     4.0    -      -       -      +
    156A  ALA*     1.3    78.1    -      -       -      +
    158A  GLN*     1.3    66.8    +      -       -      +
    159A  HIS*     3.8    11.5    -      -       -      +
    160A  TRP*     2.9    31.4    +      -       -      +
    161A  ALA*     3.0    22.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  LEU      5.0     0.4    +      -       -      -
     88A  SER*     2.5    52.6    +      -       -      -
    146A  TRP*     3.4    46.8    -      -       +      +
    147A  LEU*     3.4    17.4    +      -       -      +
    149A  GLU*     2.9    22.8    +      -       +      +
    150A  PRO      4.6     2.6    +      -       -      -
    151A  LEU*     3.4    24.0    -      -       +      +
    152A  GLY      5.0     2.2    -      -       -      +
    157A  ASN*     1.3    72.4    -      -       -      +
    159A  HIS*     1.3    63.2    +      -       -      +
    161A  ALA*     3.3     1.3    +      -       -      +
    162A  TRP*     3.2    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  HIS*     3.9    40.1    +      +       +      +
     36A  LEU*     3.9    26.2    -      -       +      +
    147A  LEU*     2.9    35.2    +      -       +      +
    148A  ALA*     5.4     0.4    -      -       -      -
    157A  ASN*     3.2    12.3    -      -       -      +
    158A  GLN*     1.3    77.5    -      -       -      +
    160A  TRP*     1.3    62.4    +      -       -      +
    162A  TRP*     3.5     1.6    +      -       -      +
    163A  PHE*     3.1    22.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  TYR*     3.9    12.6    -      +       -      -
    156A  ALA*     3.9    22.2    -      -       +      -
    157A  ASN*     2.9    25.6    +      -       -      +
    159A  HIS*     1.3    77.0    -      -       -      +
    161A  ALA*     1.3    59.3    +      -       -      +
    163A  PHE*     3.3    29.1    +      +       -      +
    164A  HIS*     2.7    77.7    +      +       +      -
    167A  GLU*     5.0     2.2    -      -       -      -
    304A  GOL      5.4     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84A  TYR*     3.7    28.2    -      -       +      -
     88A  SER*     5.0     0.7    -      -       -      -
    151A  LEU*     4.0    19.3    -      -       +      -
    157A  ASN      3.0    13.8    +      -       -      +
    158A  GLN*     3.3     8.9    +      -       -      +
    160A  TRP*     1.3    85.2    -      -       +      +
    162A  TRP*     1.3    66.9    +      -       +      +
    164A  HIS*     3.2     4.3    +      -       -      +
    165A  VAL*     3.1    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  LEU*     3.9    19.9    -      -       +      +
     40A  LEU*     4.0    12.8    -      -       +      +
     81A  GLU*     4.1     6.1    -      -       +      -
     84A  TYR*     3.9    29.8    -      -       +      -
     85A  HIS*     3.7    22.2    -      +       -      -
     88A  SER*     2.9    25.2    +      -       -      -
     89A  PHE*     3.5    24.1    -      +       -      -
    135A  THR*     3.7    19.3    -      -       +      -
    139A  PHE*     3.5    35.0    -      +       +      -
    146A  TRP*     4.1     9.0    -      +       -      -
    147A  LEU*     5.1     0.9    -      -       +      -
    158A  GLN*     3.2    24.0    +      -       -      +
    161A  ALA*     1.3    76.6    -      -       +      +
    163A  PHE*     1.3    65.6    +      -       -      +
    165A  VAL*     3.4    34.1    +      -       +      +
    166A  MSE      3.3    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  LEU*     4.0    15.6    -      -       +      +
     39A  MSE      5.7     2.9    -      -       -      -
    159A  HIS*     3.1    21.8    +      -       +      +
    160A  TRP*     3.4    33.0    -      +       -      +
    162A  TRP*     1.3    76.3    -      -       -      +
    164A  HIS*     1.3    58.3    +      -       -      +
    166A  MSE      3.2    29.8    +      -       +      +
    167A  GLU*     2.8    50.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  VAL*     5.1     4.0    -      -       +      +
     84A  TYR*     3.4    33.2    -      +       -      -
    160A  TRP*     2.7    53.0    +      +       +      +
    161A  ALA      3.4     4.5    -      -       -      +
    163A  PHE*     1.3    73.4    -      -       -      +
    165A  VAL*     1.3    60.5    +      -       -      +
    167A  GLU*     2.6    30.4    +      -       -      -
    168A  ASP*     2.8    48.7    +      -       +      +
    304A  GOL      3.1    19.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  LEU*     4.1    10.1    -      -       +      -
     77A  ILE      5.7     1.3    -      -       -      +
     80A  VAL*     4.2    16.0    -      -       +      +
     81A  GLU*     4.2    25.6    -      -       +      +
     84A  TYR*     3.6    38.6    -      -       +      -
    132A  ARG*     5.0     1.3    -      -       -      +
    161A  ALA      3.1    19.1    +      -       -      +
    162A  TRP*     3.7    32.5    -      -       +      +
    163A  PHE      3.3     0.2    -      -       -      -
    164A  HIS*     1.3    75.5    -      -       -      +
    166A  MSE      1.3    62.7    +      -       -      +
    168A  ASP*     4.3     0.9    -      -       -      +
    169A  GLU*     3.3    24.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MSE 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36A  LEU*     5.8     2.0    -      -       +      -
     39A  MSE      3.6    53.6    -      -       +      +
     40A  LEU*     3.7    20.4    -      -       +      +
     43A  ALA*     3.9     8.7    -      -       +      -
    162A  TRP      3.3     6.5    +      -       -      +
    163A  PHE*     3.2    42.1    +      -       +      +
    165A  VAL*     1.3    78.2    -      -       -      +
    167A  GLU*     1.3    66.4    +      -       -      +
    169A  GLU*     3.2     9.7    +      -       -      +
    170A  VAL*     3.1    39.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160A  TRP*     5.0     2.4    -      -       -      -
    163A  PHE*     2.8    45.9    +      -       +      +
    164A  HIS*     2.6    37.7    +      -       -      +
    166A  MSE      1.3    78.5    -      -       +      +
    168A  ASP*     1.3    64.9    +      -       -      +
    170A  VAL*     3.2     7.0    +      -       -      +
    171A  ASN*     2.9    34.5    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     76A  HIS*     3.2     3.6    +      -       -      -
     80A  VAL*     4.1    14.2    -      -       +      +
    164A  HIS*     2.8    38.5    +      -       +      +
    165A  VAL      4.3     2.5    -      -       -      +
    167A  GLU*     1.3    84.5    -      -       -      +
    169A  GLU*     1.3    61.9    +      -       -      +
    171A  ASN*     3.3    14.1    +      -       -      +
    172A  HIS*     3.0    34.7    +      -       -      -
    300A   NI      2.1    45.6    -      -       -      +
    302A  SO4      4.6     1.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  LEU*     5.7     0.3    -      -       -      +
     43A  ALA*     4.1    18.3    -      -       +      +
     44A  ARG*     2.8    43.8    +      -       -      -
     47A  THR*     2.6    31.8    +      -       -      +
     77A  ILE*     3.4    34.6    -      -       +      +
    132A  ARG*     4.0     8.0    +      -       -      -
    165A  VAL*     3.3    14.9    +      -       -      +
    166A  MSE      3.2    12.5    +      -       -      +
    168A  ASP*     1.3    77.7    -      -       -      +
    170A  VAL*     1.3    51.1    +      -       -      +
    172A  HIS*     3.2     3.6    +      -       -      +
    173A  ARG*     2.7    33.3    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     42A  TYR*     6.4     0.4    -      -       +      -
     43A  ALA*     3.8    22.7    -      -       +      +
    166A  MSE      3.1    24.7    +      -       -      +
    167A  GLU*     3.2     9.1    +      -       -      +
    169A  GLU*     1.3    71.5    -      -       +      +
    171A  ASN*     1.3    66.8    +      -       -      +
    173A  ARG*     3.2    37.4    +      -       -      +
    174A  GLY*     3.0    20.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  GLU*     2.9    19.2    +      -       -      +
    168A  ASP*     3.3    17.0    -      -       -      +
    170A  VAL*     1.3    78.0    -      -       -      +
    172A  HIS*     1.3    77.6    +      -       -      +
    174A  GLY*     3.3     8.3    +      -       -      -
    175A  GLN*     3.5    20.8    +      -       -      +
    302A  SO4      2.8    27.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  LEU*     3.7    14.3    -      -       +      +
     76A  HIS*     3.3    12.6    -      +       -      -
     77A  ILE*     4.2    16.8    -      -       +      -
    108A  MSE      3.6    14.4    -      -       +      -
    168A  ASP*     3.0    26.7    +      -       -      +
    169A  GLU      3.9     2.7    -      -       -      +
    171A  ASN*     1.3    86.6    +      -       -      +
    173A  ARG*     1.3    60.9    +      -       -      +
    175A  GLN*     2.8    29.7    +      -       -      +
    176A  LEU*     2.8    31.7    +      -       -      +
    300A   NI      2.1    44.6    -      -       +      +
    302A  SO4      3.4    19.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42A  TYR*     4.6     9.7    -      -       -      -
     43A  ALA      5.1     0.4    +      -       -      -
     46A  THR*     3.0    51.9    +      -       -      +
     47A  THR*     4.0    17.5    -      -       -      +
     50A  ALA*     4.2     9.0    -      -       +      -
     77A  ILE*     4.8     0.4    -      -       -      +
    169A  GLU      2.7    21.1    +      -       -      +
    170A  VAL*     3.2    37.7    +      -       -      +
    172A  HIS*     1.3    70.5    -      -       -      +
    174A  GLY*     1.3    66.8    +      -       -      +
    176A  LEU*     3.2    11.4    +      -       +      +
    177A  ARG*     3.0    64.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  VAL      3.0    13.9    +      -       -      -
    171A  ASN      3.3     5.1    +      -       -      -
    172A  HIS      3.2     0.6    -      -       -      -
    173A  ARG*     1.3    82.8    -      -       -      +
    175A  GLN*     1.3    60.9    +      -       -      +
    177A  ARG*     3.5    10.6    +      -       -      +
    178A  LEU*     3.5    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  PHE*     4.0    11.5    -      -       +      -
     68A  ASN*     5.5     1.7    +      -       -      -
     73A  LEU*     4.0    18.7    -      -       +      +
    171A  ASN*     3.6    18.2    +      -       -      +
    172A  HIS*     2.8    33.0    +      -       -      +
    174A  GLY*     1.3    74.7    -      -       -      +
    176A  LEU*     1.3    63.8    +      -       -      +
    178A  LEU*     3.2     9.8    +      -       -      +
    179A  LEU*     3.0    23.4    +      -       -      +
    302A  SO4      2.9    29.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  THR*     4.2    12.6    -      -       +      -
     50A  ALA*     4.7    11.3    -      -       +      +
     51A  VAL*     4.1    12.1    -      -       +      -
     70A  ILE*     3.7    40.7    -      -       +      +
     73A  LEU*     3.7    27.8    -      -       +      +
     74A  LEU*     4.1    21.5    -      -       +      -
     77A  ILE*     4.5     7.0    -      -       +      -
    172A  HIS      2.8    17.9    +      -       -      +
    173A  ARG*     3.2    20.6    +      -       +      +
    175A  GLN*     1.3    72.4    -      -       -      +
    177A  ARG*     1.3    63.5    +      -       -      +
    179A  LEU*     3.3     3.8    +      -       -      +
    180A  ARG*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  THR*     4.6    13.5    +      -       -      +
     49A  GLN*     4.7    11.9    +      -       -      -
     50A  ALA*     4.4    17.0    -      -       +      +
    173A  ARG*     3.0    59.7    +      -       -      +
    174A  GLY*     3.6    12.3    -      -       -      +
    175A  GLN      3.2     0.2    -      -       -      -
    176A  LEU*     1.3    78.8    -      -       -      +
    178A  LEU*     1.3    66.2    +      -       +      +
    180A  ARG*     4.0     4.4    -      -       -      +
    181A  GLN*     3.3    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  PHE*     3.8    22.4    -      -       +      -
    174A  GLY      3.5    13.0    +      -       -      +
    175A  GLN*     3.2     9.0    +      -       -      +
    177A  ARG*     1.3    79.2    -      -       +      +
    179A  LEU*     1.3    64.6    +      -       -      +
    181A  GLN*     3.3    22.9    +      -       -      +
    182A  VAL*     3.1    25.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  ALA      4.3     4.5    -      -       -      +
     63A  ALA*     4.2    15.9    -      -       +      +
     66A  PHE*     3.8    37.4    -      -       +      +
     68A  ASN      3.3    26.2    -      -       -      +
     69A  SER*     3.9     4.7    -      -       -      -
     70A  ILE*     3.7    27.6    -      -       +      +
     73A  LEU*     5.0     4.7    -      -       +      -
    175A  GLN      3.0    16.5    +      -       -      +
    176A  LEU*     3.9     4.5    -      -       -      +
    178A  LEU*     1.3    72.5    -      -       -      +
    180A  ARG*     1.3    66.2    +      -       -      +
    182A  VAL*     3.2     4.0    +      -       +      +
    183A  LEU*     3.0    49.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  GLN      4.3     2.0    +      -       -      -
     50A  ALA      2.9    30.3    +      -       -      +
     51A  VAL*     3.3    10.8    -      -       -      +
     52A  GLU      2.8    30.7    +      -       -      +
     53A  GLY*     3.6    16.6    +      -       -      -
     54A  LEU*     3.6    26.2    -      -       +      +
     55A  PRO*     5.0     2.8    -      -       -      +
     70A  ILE*     4.2    14.3    -      -       +      +
    176A  LEU      2.9    18.0    +      -       -      +
    177A  ARG*     4.0     4.5    -      -       -      +
    179A  LEU*     1.3    76.6    -      -       -      +
    181A  GLN*     1.3    58.4    +      -       -      +
    183A  LEU*     3.3     2.6    +      -       -      -
    184A  ALA*     3.0    44.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177A  ARG      3.3    10.0    +      -       -      +
    178A  LEU*     3.3    29.7    +      -       -      +
    179A  LEU      3.2     0.2    -      -       -      -
    180A  ARG*     1.3    78.4    -      -       -      +
    182A  VAL*     1.3    64.1    +      -       +      +
    184A  ALA      3.6    18.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  ALA*     3.6    29.4    -      -       +      -
     64A  PRO*     5.7     0.7    -      -       +      -
     66A  PHE*     3.9    20.9    -      -       +      -
    178A  LEU*     3.1    16.7    +      -       +      +
    179A  LEU*     3.2    10.1    +      -       -      +
    181A  GLN*     1.3    76.0    -      -       +      +
    183A  LEU*     1.3    65.1    +      -       +      +
    184A  ALA      3.5     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  GLN*     3.6    49.4    -      -       +      +
     61A  ALA*     3.9    26.0    -      -       +      +
     62A  THR      4.0    15.0    -      -       -      +
     63A  ALA*     4.7     0.7    -      -       +      -
     70A  ILE*     4.3    10.5    -      -       +      -
    179A  LEU*     3.0    44.0    +      -       +      +
    180A  ARG      4.0     1.3    -      -       -      +
    182A  VAL*     1.3    83.1    -      -       +      +
    184A  ALA*     1.3    57.8    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     55A  PRO*     5.2     3.8    -      -       +      -
     58A  GLN*     3.3    25.4    -      -       -      +
    180A  ARG*     3.0    28.2    +      -       +      +
    181A  GLN*     3.6    17.6    -      -       -      +
    182A  VAL      3.3     2.2    +      -       -      -
    183A  LEU*     1.3    81.8    -      -       -      +
----------------------------------------------------------
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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