Contacts of the helix formed by residues 130 - 154 (chain D) in PDB entry 2Q9Q


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 GLU 130 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88D  LEU*     3.4    23.3    -      -       +      +
     93D  GLN*     4.8     2.8    -      -       -      +
     94D  GLU*     4.7     3.6    +      -       -      +
     97D  ARG*     2.7    29.9    +      -       -      +
    128D  SER*     3.1    16.1    +      -       -      +
    129D  PRO*     1.3    80.6    -      -       +      +
    131D  ASN*     1.3    56.2    +      -       -      -
    132D  ALA*     3.1     3.4    -      -       -      -
    133D  ASP*     2.9    26.1    +      -       +      +
    134D  ILE*     2.8    29.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 131 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  LEU*     4.3    14.4    -      -       +      +
    123D  LEU      4.4     1.4    -      -       -      +
    124D  LEU*     2.8    52.9    +      -       +      +
    127D  ASP*     3.9    11.7    -      -       -      +
    128D  SER*     3.0    33.7    +      -       -      +
    129D  PRO      3.2     2.0    -      -       -      +
    130D  GLU*     1.3    77.6    -      -       -      +
    132D  ALA*     1.3    56.1    +      -       -      +
    134D  ILE*     3.3     9.5    +      -       -      +
    135D  SER*     2.8    31.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 132 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  LEU*     3.8    18.5    -      -       +      +
    129D  PRO      4.6     4.1    +      -       -      +
    130D  GLU*     3.1     1.2    -      -       -      +
    131D  ASN*     1.3    76.6    -      -       -      +
    133D  ASP*     1.3    68.9    +      -       -      +
    135D  SER*     4.0     0.7    -      -       -      -
    136D  GLN*     3.2    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 133 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97D  ARG*     3.1    34.9    +      -       -      +
    129D  PRO      5.1     0.2    -      -       -      +
    130D  GLU*     2.9    25.2    +      -       +      +
    132D  ALA*     1.3    79.1    -      -       -      +
    134D  ILE*     1.3    65.8    +      -       -      +
    136D  GLN*     4.0     3.1    -      -       -      +
    137D  SER*     3.1    25.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 134 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88D  LEU*     3.5    40.2    -      -       +      -
     92D  TYR*     4.1    35.7    -      -       +      +
     97D  ARG*     4.6     5.2    -      -       -      +
    120D  GLY      4.3    11.7    -      -       -      +
    123D  LEU*     4.6     8.3    -      -       +      -
    124D  LEU*     4.1    13.5    -      -       +      -
    128D  SER*     4.5     0.9    -      -       -      -
    130D  GLU      2.8    20.0    +      -       -      +
    131D  ASN*     3.6    21.8    -      -       -      +
    133D  ASP*     1.3    76.6    -      -       -      +
    135D  SER*     1.3    64.4    +      -       -      +
    137D  SER*     3.2     7.5    +      -       -      -
    138D  LEU*     3.1    33.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 135 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  LEU      4.0     4.9    +      -       -      +
    173A  ASN*     2.7    30.1    +      -       -      +
    174A  LEU*     3.6    22.3    -      -       -      +
    124D  LEU*     4.3     4.2    -      -       -      +
    131D  ASN      2.8    17.9    +      -       -      -
    132D  ALA      4.0     1.6    -      -       -      -
    134D  ILE*     1.3    77.3    -      -       -      +
    136D  GLN*     1.3    62.3    +      -       -      +
    138D  LEU*     3.1    23.7    +      -       -      +
    139D  LEU*     3.3    12.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 136 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132D  ALA      3.2    16.6    +      -       -      +
    133D  ASP*     4.2     3.8    -      -       -      +
    135D  SER*     1.3    79.1    -      -       -      +
    137D  SER*     1.3    62.8    +      -       -      +
    139D  LEU*     3.5     8.3    +      -       +      +
    140D  GLN*     3.0    49.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 137 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97D  ARG*     3.2    34.5    +      -       -      +
    100D  PHE*     4.4    10.2    -      -       -      +
    116D  PHE*     5.2     3.4    -      -       -      -
    133D  ASP      3.1    20.0    +      -       -      -
    134D  ILE*     3.4     7.4    -      -       -      -
    136D  GLN*     1.3    77.2    -      -       -      +
    138D  LEU*     1.3    60.8    +      -       -      +
    140D  GLN*     4.2     4.2    -      -       -      +
    141D  THR*     2.6    38.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 138 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170A  LEU*     4.2    13.9    -      -       +      -
    173A  ASN*     4.2    15.3    -      -       -      +
     92D  TYR*     4.1    21.1    -      -       +      -
    116D  PHE*     3.9    31.6    -      -       +      +
    117D  TYR*     3.3    23.7    -      -       +      +
    120D  GLY*     3.7    28.9    -      -       -      +
    121D  SER*     3.8    13.7    -      -       -      +
    124D  LEU*     5.0     1.1    -      -       +      -
    134D  ILE*     3.1    24.6    +      -       +      +
    135D  SER*     3.1     8.9    +      -       -      +
    137D  SER*     1.3    79.4    -      -       -      +
    139D  LEU*     1.3    62.4    +      -       -      +
    142D  PHE*     3.3    17.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  GLN*     3.6    29.2    -      -       -      +
    167A  MET*     3.9    28.9    -      -       +      +
    170A  LEU*     3.8    32.5    -      -       +      +
    171A  ARG*     4.0    23.1    -      -       +      +
    135D  SER      3.3     8.7    +      -       -      +
    136D  GLN*     4.0     9.9    -      -       +      +
    138D  LEU*     1.3    78.4    -      -       -      +
    140D  GLN*     1.3    65.4    +      -       +      +
    142D  PHE*     3.2     4.2    +      -       -      +
    143D  ILE*     2.9    45.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 140 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  ARG*     5.6     2.8    +      -       -      -
    139A  GLN*     3.9    22.4    -      -       -      +
    101D  SER*     6.3     3.1    -      -       -      -
    104D  PRO*     4.3     5.1    -      -       -      +
    136D  GLN*     3.0    39.9    +      -       +      +
    137D  SER*     4.2     3.8    -      -       -      +
    139D  LEU*     1.3    81.4    -      -       -      +
    141D  THR*     1.3    58.4    +      -       -      +
    143D  ILE*     3.3    16.4    +      -       -      +
    144D  GLY*     2.8    27.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 141 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100D  PHE*     3.6    45.8    +      -       +      +
    104D  PRO*     3.7    11.2    -      -       +      +
    109D  LEU*     4.4     1.3    -      -       +      -
    116D  PHE*     3.8    17.0    -      -       +      -
    117D  TYR*     3.5    14.6    -      -       -      +
    137D  SER*     2.6    24.7    +      -       -      -
    138D  LEU      3.6     4.5    -      -       -      -
    139D  LEU      3.2     0.2    -      -       -      -
    140D  GLN*     1.3    78.0    -      -       -      +
    142D  PHE*     1.3    62.0    +      -       -      +
    144D  GLY      3.5     0.7    +      -       -      -
    145D  ARG*     3.1    40.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 142 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  ALA*     3.6    21.8    -      -       +      -
    166A  HIS*     4.4     6.1    -      -       +      -
    167A  MET*     3.4    38.8    -      -       +      -
    170A  LEU*     4.2    12.1    -      -       +      -
    117D  TYR*     3.5    25.1    +      +       +      -
    138D  LEU      3.3     4.5    +      -       -      +
    139D  LEU      3.2     6.8    +      -       -      +
    141D  THR*     1.3    76.6    -      -       -      +
    143D  ILE*     1.3    61.6    +      -       -      +
    145D  ARG*     3.1     1.9    +      -       -      -
    146D  PHE*     2.8    39.5    +      +       +      +
    149D  ILE*     4.7    11.0    -      -       +      -
    171D  MET*     3.4    28.7    -      -       +      -
    172D  GLU*     4.6     5.4    -      -       +      -
    175D  LEU*     3.3    33.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 143 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  ASP*     4.9     0.3    -      -       -      +
    136A  VAL*     4.1    10.2    -      -       +      +
    137A  ARG*     3.7    51.6    +      -       -      +
    139A  GLN*     3.7    40.8    -      -       +      +
    167A  MET*     3.9    19.7    -      -       +      -
    139D  LEU*     2.9    32.7    +      -       +      +
    140D  GLN*     3.6    19.7    -      -       -      +
    142D  PHE*     1.3    79.2    -      -       -      +
    144D  GLY*     1.3    62.5    +      -       -      +
    145D  ARG      3.3     0.2    +      -       -      -
    146D  PHE*     3.5    12.6    +      -       -      +
    147D  ARG      4.8     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 144 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  ARG*     4.3    16.6    +      -       -      -
    104D  PRO*     3.9    16.1    -      -       -      +
    105D  ASN*     3.3    21.3    +      -       -      -
    140D  GLN      2.8    16.7    +      -       -      -
    141D  THR      3.9     2.5    -      -       -      -
    142D  PHE      3.2     0.2    -      -       -      -
    143D  ILE*     1.3    76.9    -      -       -      +
    145D  ARG*     1.3    60.3    +      -       -      +
    147D  ARG*     5.1     3.0    +      -       -      +
    148D  ARG      5.5     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 145 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104D  PRO*     2.8    33.3    +      -       +      +
    105D  ASN*     3.6    20.0    +      -       -      +
    107D  VAL*     2.3    37.0    +      -       -      +
    109D  LEU*     3.4    18.7    -      -       -      +
    117D  TYR*     3.8     4.7    -      -       -      -
    141D  THR*     3.1    22.1    +      -       -      +
    142D  PHE*     3.1     4.9    +      -       -      +
    144D  GLY*     1.3    75.2    -      -       -      +
    146D  PHE*     1.3    67.2    +      -       -      +
    147D  ARG      3.3     2.8    +      -       -      -
    148D  ARG*     3.3     6.2    +      -       -      +
    149D  ILE*     3.3    27.5    +      -       +      +
    167D  ARG*     3.6    13.9    +      -       -      +
    168D  LEU*     3.8    10.3    -      -       +      +
    172D  GLU*     2.8    47.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 146 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ARG      5.0     0.4    -      -       -      -
    132A  ALA*     3.8    26.9    -      -       +      -
    133A  ASP*     3.9    13.9    -      -       +      -
    136A  VAL*     3.8    33.2    -      -       +      -
    159A  PHE*     3.6    22.4    -      +       -      -
    160A  LEU*     4.0    14.1    -      -       +      -
    163A  ALA*     3.6    26.5    -      -       +      -
    142D  PHE*     2.8    27.2    +      +       +      +
    143D  ILE      3.5    11.1    +      -       -      +
    145D  ARG*     1.3    75.4    -      -       -      +
    147D  ARG*     1.3    68.4    +      -       -      +
    149D  ILE*     3.3    11.0    +      -       -      +
    150D  MET*     3.1    45.7    +      -       +      +
    175D  LEU*     5.5     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 147 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  ALA      5.0     0.2    +      -       -      -
    129A  ARG*     3.6    21.5    -      -       -      +
    130A  VAL*     3.3    39.6    -      -       -      +
    133A  ASP*     3.3    43.8    +      -       -      +
    143D  ILE      4.8     1.2    +      -       -      -
    144D  GLY      5.1     3.1    +      -       -      +
    145D  ARG      3.4     0.8    -      -       -      -
    146D  PHE*     1.3    84.0    -      -       -      +
    148D  ARG*     1.3    58.8    +      -       -      +
    150D  MET*     3.4     2.5    +      -       -      +
    151D  ASP*     2.8    64.7    +      -       -      +
    157D  TYR*     4.3     8.9    +      -       -      -
    100G  ASN*     6.0     4.0    -      -       -      +
    101G  ALA*     5.7     1.2    -      -       -      +
    104G  PHE*     6.0     2.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 148 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103D  ASP*     5.7     0.8    +      -       -      -
    105D  ASN*     3.5    52.5    +      -       -      +
    144D  GLY      5.5     0.6    +      -       -      -
    145D  ARG      3.3     5.2    +      -       -      +
    147D  ARG*     1.3    78.3    -      -       -      +
    149D  ILE*     1.3    60.2    +      -       +      +
    151D  ASP*     3.9     7.1    -      -       -      +
    152D  SER*     3.0    27.5    +      -       -      -
    164D  LEU*     4.2    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 149 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  PHE*     3.9    19.3    -      -       +      -
    142D  PHE*     4.7    12.3    -      -       +      -
    145D  ARG*     3.3    22.0    -      -       +      +
    146D  PHE*     3.3     6.7    +      -       -      +
    147D  ARG      3.2     0.4    -      -       -      -
    148D  ARG*     1.3    76.7    -      -       +      +
    150D  MET*     1.3    60.2    +      -       -      +
    152D  SER*     3.4     5.9    +      -       -      -
    153D  SER*     2.9    32.6    +      -       -      -
    164D  LEU*     5.0     2.2    -      -       +      -
    168D  LEU*     4.1    18.8    -      -       +      -
    172D  GLU*     3.7    57.7    -      -       +      +
    175D  LEU*     4.4     4.0    -      -       +      -
    176D  PHE*     4.2    12.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 150 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  LEU*     4.5     6.3    -      -       +      +
    129A  ARG*     4.0    34.8    -      -       +      +
    132A  ALA*     4.1    13.2    -      -       +      -
    156A  SER*     4.5    22.4    -      -       -      +
    159A  PHE*     3.4    36.2    -      -       +      -
    160A  LEU*     5.1     4.9    -      -       +      -
    146D  PHE*     3.1    39.8    +      -       +      +
    147D  ARG*     3.9     5.8    -      -       -      +
    149D  ILE*     1.3    77.0    -      -       -      +
    151D  ASP*     1.3    63.7    +      -       -      +
    153D  SER*     2.9    15.9    +      -       -      -
    154D  GLN*     3.1    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 151 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ARG*     3.0    24.5    +      -       -      +
    147D  ARG*     2.8    52.9    +      -       -      +
    148D  ARG*     3.9     7.9    -      -       +      +
    150D  MET*     1.3    78.1    -      -       -      +
    152D  SER*     1.3    57.8    +      -       -      +
    154D  GLN*     3.4     0.9    +      -       -      -
    155D  ASN      3.1     6.2    +      -       -      -
    156D  ALA*     2.9    29.4    +      -       +      +
    157D  TYR*     3.1    39.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 152 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148D  ARG*     3.0    16.8    +      -       -      -
    149D  ILE      3.4     3.3    +      -       -      -
    151D  ASP*     1.3    74.4    -      -       -      +
    153D  SER*     1.3    68.2    +      -       -      +
    154D  GLN      3.0     2.0    -      -       -      -
    155D  ASN*     2.9    11.5    +      -       -      +
    156D  ALA      4.9     0.2    -      -       -      +
    157D  TYR*     6.5     0.4    -      -       -      -
    159D  GLU*     3.8    22.2    -      -       -      -
    161D  THR*     3.5    20.4    -      -       -      +
    164D  LEU*     3.1    34.5    -      -       -      +
    176D  PHE*     3.6     7.1    -      -       -      -
    180D  GLN*     5.2     1.0    -      -       -      +
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Residues in contact with SER 153 (chain D). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    159A  PHE*     3.6     9.6    -      -       -      -
    149D  ILE      2.9    16.2    +      -       -      -
    150D  MET*     2.9    21.0    +      -       -      -
    152D  SER*     1.3    77.9    +      -       -      +
    154D  GLN*     1.3    63.6    +      -       -      +
    155D  ASN*     3.3     0.7    +      -       -      +
    176D  PHE*     3.4    45.1    -      -       -      -
    179D  GLY*     3.8     5.0    -      -       -      +
    180D  GLN*     3.4    30.1    +      -       -      +
    183D  LEU*     4.5     3.1    -      -       -      +
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Residues in contact with GLN 154 (chain D). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    125A  ILE*     3.9    13.6    -      -       +      +
    129A  ARG*     3.0    38.3    +      -       -      +
    155A  THR*     4.7     6.1    +      -       -      +
    156A  SER*     2.9    36.0    -      -       -      +
    159A  PHE*     5.5     2.2    -      -       -      +
    150D  MET*     3.1    30.6    +      -       +      +
    151D  ASP      4.1     0.7    -      -       -      +
    152D  SER      3.0     0.6    -      -       -      -
    153D  SER*     1.3    84.6    -      -       -      +
    155D  ASN*     1.3    69.4    +      -       -      +
    156D  ALA*     3.2     2.6    +      -       -      -
    179D  GLY*     4.6    13.0    +      -       -      +
    183D  LEU*     3.1    32.2    -      -       +      +
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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
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  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) +   -    +    +   +   +    +    -
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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