Contacts of the helix formed by residues 141 - 166 (chain D) in PDB entry 2UX1


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 ASP 141 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22D  LEU*     4.2    17.0    -      -       +      +
     25D  SER*     3.8    20.5    -      -       -      +
     79D  ARG*     3.0    25.9    +      -       -      -
     83D  LEU*     3.3    19.9    -      -       -      +
    136D  SER*     2.8    15.4    +      -       -      +
    137D  ASP*     5.6     0.4    -      -       -      -
    139D  GLU      3.3     0.4    -      -       -      -
    140D  GLY*     1.3    73.4    -      -       -      +
    142D  SER*     1.3    56.8    +      -       -      +
    143D  VAL      3.8     0.9    +      -       -      -
    144D  THR*     2.7    29.2    +      -       -      -
    145D  ASN*     3.0    27.5    +      -       -      +
    152F  LYS*     5.2     2.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 142 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137D  ASP*     6.4     0.2    -      -       -      +
    140D  GLY      3.4     7.8    +      -       -      -
    141D  ASP*     1.3    71.4    +      -       -      +
    143D  VAL*     1.3    64.6    +      -       -      +
    145D  ASN*     3.6    10.2    -      -       -      +
    146D  ASP      3.1    13.3    +      -       -      -
    130F  GLN*     4.8     4.6    +      -       -      -
    133F  PHE*     3.3    41.0    -      -       -      -
    149F  ASN*     2.7    36.6    +      -       -      -
    152F  LYS*     4.5    12.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 143 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79D  ARG*     3.4    37.5    -      -       -      +
    141D  ASP*     3.3     1.2    +      -       -      -
    142D  SER*     1.3    74.3    +      -       -      +
    144D  THR*     1.3    66.0    +      -       -      +
    146D  ASP*     3.2     6.6    +      -       -      +
    147D  ILE*     3.2    27.4    +      -       +      +
    149F  ASN*     3.8    15.3    -      -       -      +
    152F  LYS*     3.7    24.2    -      -       +      +
    153F  ALA*     3.4    44.2    -      -       +      +
    156F  GLU*     3.9     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 144 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25D  SER*     4.9     4.5    -      -       -      -
     29D  LEU*     3.9    22.4    -      -       +      -
     79D  ARG*     3.2    18.0    +      -       -      +
     83D  LEU*     3.9     2.3    -      -       -      +
    136D  SER*     4.0     9.2    -      -       -      -
    141D  ASP*     2.7    33.9    +      -       -      +
    143D  VAL*     1.3    77.6    -      -       -      +
    145D  ASN*     1.3    63.7    +      -       -      +
    147D  ILE*     3.1    21.0    +      -       +      +
    148D  PHE*     3.1    41.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 145 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133D  PHE*     2.8    64.3    +      -       -      +
    136D  SER*     3.1    15.5    +      -       -      +
    137D  ASP*     3.4    24.5    +      -       -      +
    141D  ASP      3.0    15.8    +      -       -      +
    142D  SER*     3.6    11.6    -      -       -      +
    144D  THR*     1.3    77.4    -      -       -      +
    146D  ASP*     1.3    63.0    +      -       -      +
    148D  PHE*     3.3     1.0    +      -       -      +
    149D  ASN*     3.1    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142D  SER      3.1     6.1    +      -       -      -
    143D  VAL*     3.2     9.6    +      -       -      +
    145D  ASN*     1.3    78.9    +      -       -      +
    147D  ILE*     1.3    65.3    +      -       -      +
    149D  ASN*     3.2    10.2    +      -       -      +
    150D  VAL*     3.0    39.5    +      -       -      +
    146F  ASP*     4.1    14.1    -      -       -      +
    149F  ASN*     3.6    22.7    -      -       -      +
    150F  VAL*     5.6     8.6    -      -       -      +
    146K  ASP*     4.8     8.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 147 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  LEU*     5.3     1.8    -      -       +      -
     72D  TYR*     5.5     0.3    -      -       -      -
     75D  GLU*     3.8    41.3    -      -       +      +
     76D  MET*     3.6    33.9    -      -       +      -
     79D  ARG*     3.7    41.1    -      -       +      -
    143D  VAL*     3.2    19.3    +      -       +      +
    144D  THR*     3.1    11.0    +      -       +      +
    146D  ASP*     1.3    79.1    -      -       -      +
    148D  PHE*     1.3    64.0    +      -       +      +
    150D  VAL*     3.6     5.5    +      -       -      +
    151D  ALA*     3.2    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 148 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28D  VAL*     4.1    16.8    -      -       +      -
     29D  LEU*     3.8    23.8    -      -       +      -
     32D  ALA*     4.3     6.5    -      -       +      -
     76D  MET*     3.7    23.3    -      -       +      -
    128D  LEU*     4.8     2.2    -      -       +      -
    129D  PHE*     3.5    50.7    -      +       -      +
    132D  GLY*     3.4    32.5    -      -       -      -
    133D  PHE*     3.9     5.4    -      -       -      +
    136D  SER*     4.4     0.4    -      -       -      -
    144D  THR*     3.1    46.1    +      -       +      -
    145D  ASN      3.8     4.7    -      -       -      +
    147D  ILE*     1.3    74.7    -      -       +      +
    149D  ASN*     1.3    60.6    +      -       -      +
    151D  ALA*     3.4     1.4    +      -       -      +
    152D  LYS*     2.9    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 149 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133D  PHE*     3.8    14.9    -      -       +      -
    145D  ASN*     3.1    15.0    +      -       -      +
    146D  ASP*     3.2    13.6    +      -       -      +
    148D  PHE*     1.3    77.1    -      -       -      +
    150D  VAL*     1.3    57.8    +      -       +      +
    152D  LYS*     3.4     6.5    +      -       -      +
    153D  ALA*     2.9    29.5    +      -       -      +
    142K  SER*     2.8    48.6    +      -       -      -
    143K  VAL*     3.4    13.0    +      -       -      +
    146K  ASP*     3.8    18.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 150 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  TYR*     4.9     9.9    -      -       +      +
     75D  GLU*     5.8     3.4    -      -       -      +
    146D  ASP*     3.0    37.3    +      -       -      +
    147D  ILE*     3.9     5.6    -      -       -      +
    149D  ASN*     1.3    72.5    -      -       +      +
    151D  ALA*     1.3    70.2    +      -       -      +
    153D  ALA*     3.3    14.7    +      -       -      +
    154D  SER*     3.3    12.7    +      -       -      -
    146K  ASP*     5.4     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72D  TYR*     3.6    34.7    +      -       +      -
     76D  MET*     3.9     7.6    -      -       +      -
    129D  PHE*     3.5    27.1    -      -       +      -
    147D  ILE      3.2    15.2    +      -       -      +
    148D  PHE      3.8     1.3    -      -       -      +
    150D  VAL*     1.3    80.3    -      -       -      +
    152D  LYS*     1.3    57.4    +      -       -      +
    154D  SER*     3.1     4.5    +      -       -      -
    155D  ILE*     3.0    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126D  ALA*     3.9    21.1    -      -       -      +
    129D  PHE*     3.7    13.5    -      -       +      +
    130D  GLN*     3.0    43.0    +      -       -      +
    133D  PHE*     5.7     2.2    -      -       +      -
    148D  PHE      2.9    17.9    +      -       -      +
    149D  ASN*     3.6     7.4    -      -       -      +
    151D  ALA*     1.3    73.8    -      -       -      +
    153D  ALA*     1.3    66.8    +      -       -      +
    155D  ILE*     4.6     3.1    -      -       -      +
    156D  GLU*     3.0    65.9    +      -       +      +
     79K  ARG*     4.4     5.5    -      -       -      +
    141K  ASP*     5.4     1.4    +      -       -      +
    142K  SER*     4.8     8.8    +      -       -      +
    143K  VAL*     3.9    15.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 153 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149D  ASN      2.9    14.3    +      -       -      +
    150D  VAL*     3.3    13.0    +      -       -      +
    152D  LYS*     1.3    75.5    -      -       -      +
    154D  SER*     1.3    57.5    +      -       -      +
    156D  GLU*     4.0     2.2    -      -       -      +
    157D  LYS*     3.2    26.3    +      -       -      +
     79K  ARG*     5.0     1.9    +      -       -      -
    143K  VAL*     3.5    35.1    -      -       +      +
    147K  ILE*     6.3     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 154 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68D  GLU*     2.6    33.2    +      -       -      -
     72D  TYR*     3.2    13.2    -      -       -      -
    150D  VAL*     3.3     5.9    +      -       -      -
    151D  ALA      3.1     2.9    +      -       -      -
    153D  ALA*     1.3    76.7    -      -       -      +
    155D  ILE*     1.3    69.3    +      -       -      +
    157D  LYS*     3.2    10.0    +      -       -      +
    158D  HIS*     3.0    30.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 155 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68D  GLU*     3.9    16.8    -      -       -      +
     69D  ILE*     4.2    18.4    -      -       +      -
     72D  TYR*     4.0    10.3    -      -       +      -
    122D  PHE*     3.3    53.2    -      -       +      +
    125D  LEU*     4.5     3.6    -      -       +      -
    126D  ALA*     4.3     7.6    -      -       +      +
    129D  PHE*     3.9    20.4    -      -       +      -
    151D  ALA      3.0    20.9    +      -       -      +
    152D  LYS*     4.2     4.9    -      -       -      +
    154D  SER*     1.3    76.4    -      -       -      +
    156D  GLU*     1.3    56.4    +      -       -      +
    158D  HIS*     3.1    14.7    +      -       +      +
    159D  ILE*     3.0    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 156 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126D  ALA*     4.0    20.3    -      -       +      +
    152D  LYS*     3.0    54.6    +      -       -      +
    153D  ALA      4.0     1.1    -      -       -      +
    155D  ILE*     1.3    78.3    -      -       -      +
    157D  LYS*     1.3    60.8    +      -       -      +
    159D  ILE*     3.3     9.2    +      -       -      +
    160D  TRP      3.1    17.5    +      -       -      -
    172D  LEU*     3.7    28.9    -      -       +      +
     79K  ARG*     2.8    37.9    +      -       -      +
     82K  THR*     3.5    11.7    -      -       +      +
    143K  VAL*     4.0     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 157 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153D  ALA      3.2    15.5    +      -       -      +
    154D  SER*     3.5    11.2    -      -       -      +
    156D  GLU*     1.3    75.0    -      -       -      +
    158D  HIS*     1.3    67.4    +      -       +      +
    160D  TRP*     3.3    18.1    +      -       +      +
    161D  MET*     3.2    46.0    +      -       +      +
     75K  GLU*     6.2     3.0    -      -       -      +
     78K  GLU*     4.2    18.0    +      -       +      +
     82K  THR*     4.4    10.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 158 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  TYR*     3.6    34.2    +      +       +      +
     68D  GLU*     2.7    35.7    +      -       -      -
    122D  PHE*     3.7    23.8    -      +       +      -
    154D  SER*     3.0    28.9    +      -       -      -
    155D  ILE*     3.1    10.7    +      -       +      +
    157D  LYS*     1.3    79.2    -      -       +      +
    159D  ILE*     1.3    61.8    +      -       -      +
    161D  MET*     3.1    15.2    +      -       -      +
    162D  LEU*     2.8    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 159 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119D  VAL*     4.3     8.5    -      -       +      +
    122D  PHE*     3.7    40.2    -      -       +      +
    123D  ARG*     3.9    23.8    -      -       +      +
    126D  ALA*     4.2     6.5    -      -       +      -
    155D  ILE*     3.0    22.3    +      -       +      +
    156D  GLU*     3.3    11.6    +      -       -      +
    158D  HIS*     1.3    75.5    -      -       -      +
    160D  TRP*     1.3    63.9    +      -       -      +
    162D  LEU*     4.5     6.3    -      -       -      -
    163D  GLN*     2.8    37.0    +      -       +      +
    170D  PRO*     3.8    22.4    -      -       +      +
    172D  LEU*     3.9    21.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 160 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156D  GLU      3.1     8.8    +      -       -      +
    157D  LYS*     3.5    26.9    -      -       +      +
    158D  HIS      3.3     0.2    -      -       -      -
    159D  ILE*     1.3    76.6    -      -       -      +
    161D  MET*     1.3    74.5    +      -       +      +
    163D  GLN*     3.8     1.2    -      -       -      +
    164D  ALA*     2.8    36.0    +      -       +      +
    168D  GLN      5.0     1.1    -      -       -      +
    170D  PRO*     4.0    27.2    -      -       +      +
     47I  HIS      5.0     0.4    -      -       -      -
     48I  TRP      4.6     5.1    +      -       -      -
     50I  MET      5.5     0.6    +      -       -      -
     55I  PHE*     3.8    22.1    -      +       -      -
     59I  HIS*     3.7    19.3    -      +       -      -
    107I  TYR*     5.9     0.2    -      -       -      -
     78K  GLU*     3.6    45.1    -      -       +      -
     81K  ILE*     3.5    36.9    -      -       +      +
     82K  THR*     3.5    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 161 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65D  TYR*     5.4     0.7    -      -       -      +
    157D  LYS*     3.2    32.7    +      -       -      +
    158D  HIS*     3.1    18.6    +      -       -      +
    160D  TRP*     1.3    96.7    -      -       +      +
    162D  LEU*     1.3    60.8    +      -       -      +
    164D  ALA*     3.3     3.3    +      -       -      +
    165D  GLU*     3.0    25.8    +      -       -      +
     55I  PHE*     3.6    27.8    -      -       +      -
     56I  MET*     4.0    26.7    -      -       +      +
     59I  HIS*     3.4    33.9    -      -       +      +
     78K  GLU*     5.0     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 162 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58D  TRP*     3.7    29.6    -      -       +      -
     65D  TYR*     3.8    15.7    -      -       +      +
    115D  LEU*     4.0    27.5    -      -       +      +
    118D  VAL*     3.6    27.6    -      -       +      -
    119D  VAL*     3.6    22.2    -      -       +      +
    122D  PHE*     3.8    19.7    -      -       +      -
    158D  HIS      2.8    24.5    +      -       -      +
    159D  ILE      3.9     1.8    -      -       -      +
    161D  MET*     1.3    70.4    -      -       -      +
    163D  GLN*     1.3    63.5    +      -       -      +
    165D  GLU*     3.2     7.4    +      -       -      +
    166D  LEU*     3.0    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 163 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119D  VAL*     3.5    15.0    -      -       +      +
    123D  ARG*     3.4    27.3    -      -       -      +
    159D  ILE*     2.8    25.3    +      -       +      +
    160D  TRP      3.8     2.9    -      -       -      +
    162D  LEU*     1.3    76.0    -      -       -      +
    164D  ALA*     1.3    62.8    +      -       -      +
    166D  LEU*     3.0    29.5    +      -       -      +
    167D  GLY      3.0     0.2    +      -       -      -
    168D  GLN*     2.9    54.2    +      -       -      +
    169D  ALA      2.9    33.7    +      -       -      +
    170D  PRO*     3.9     6.7    -      -       +      +
    171D  LYS*     3.5     3.8    -      -       -      +
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Residues in contact with ALA 164 (chain D). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160D  TRP*     2.8    27.2    +      -       +      +
    161D  MET      3.4     6.1    -      -       -      +
    162D  LEU      3.2     0.2    -      -       -      -
    163D  GLN*     1.3    77.8    -      -       -      +
    165D  GLU*     1.3    52.2    +      -       -      +
    167D  GLY*     2.9     9.2    +      -       -      -
    168D  GLN      3.6     8.7    +      -       -      +
     50I  MET      4.0     7.4    -      -       -      +
     51I  ARG*     3.5     6.6    -      -       +      +
     52I  GLY      2.8    31.9    +      -       -      -
     55I  PHE*     3.6    31.9    -      -       +      -
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Residues in contact with GLU 165 (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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     57D  ILE*     6.0     0.2    -      -       -      -
     58D  TRP*     3.5    35.7    +      -       +      -
    115D  LEU*     3.8    15.0    -      -       +      -
    161D  MET      3.0    14.1    +      -       -      +
    162D  LEU      3.2     9.6    +      -       -      +
    164D  ALA*     1.3    74.8    -      -       -      +
    166D  LEU*     1.3    57.7    +      -       -      +
    167D  GLY      3.2     1.2    +      -       -      -
     52I  GLY      3.2    25.3    -      -       -      -
     53I  ARG*     2.8    38.8    +      -       -      +
     54I  GLY*     2.9    20.0    +      -       -      -
     55I  PHE*     3.2     7.4    +      -       +      +
     56I  MET*     3.0    29.3    +      -       -      +
    173I  EPE      4.5     3.9    +      -       -      -
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Residues in contact with LEU 166 (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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    112D  GLU*     3.7    42.4    -      -       +      +
    115D  LEU*     3.9    18.8    -      -       +      -
    116D  ALA*     4.3    15.5    -      -       +      +
    119D  VAL*     4.1    13.7    -      -       +      -
    162D  LEU      3.0    17.3    +      -       -      +
    163D  GLN*     3.0    31.2    +      -       -      +
    165D  GLU*     1.3    77.4    -      -       +      +
    167D  GLY*     1.3    60.4    +      -       -      +
    168D  GLN*     3.5    25.5    +      -       -      +
     53I  ARG*     5.1     3.1    -      -       -      +
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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