Contacts of the helix formed by residues 141 - 166 (chain E) 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 E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25E  SER*     3.7    19.3    +      -       -      +
     79E  ARG*     3.1    24.4    +      -       -      -
     83E  LEU*     3.6    19.0    -      -       -      +
    136E  SER*     2.9    13.7    +      -       -      +
    139E  GLU*     3.2     8.0    -      -       +      +
    140E  GLY*     1.3    72.4    -      -       -      +
    142E  SER*     1.3    62.1    +      -       -      +
    143E  VAL      3.8     0.9    +      -       -      -
    144E  THR*     2.7    26.1    +      -       -      -
    145E  ASN*     3.0    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 142 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140E  GLY      3.3     7.0    +      -       -      -
    141E  ASP*     1.3    73.1    +      -       -      +
    143E  VAL*     1.3    62.5    +      -       -      +
    145E  ASN*     3.4    11.2    -      -       -      +
    146E  ASP*     2.9    22.9    +      -       -      +
    130I  GLN*     5.2     4.3    +      -       -      -
    133I  PHE*     3.3    39.6    -      -       -      -
    149I  ASN*     2.6    35.0    +      -       -      -
    152I  LYS*     5.1     6.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 143 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79E  ARG*     3.3    45.5    -      -       -      +
    141E  ASP*     3.3     1.4    +      -       -      +
    142E  SER*     1.3    77.6    +      -       -      +
    144E  THR*     1.3    62.4    +      -       -      +
    146E  ASP*     3.1     7.6    +      -       -      +
    147E  ILE*     3.1    28.5    +      -       +      +
    149I  ASN*     4.0    15.9    -      -       -      +
    152I  LYS*     4.3    12.3    -      -       +      -
    153I  ALA*     3.6    45.3    -      -       +      +
    156I  GLU*     4.0     6.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 144 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25E  SER*     4.2     5.6    -      -       -      +
     29E  LEU*     3.9    21.5    -      -       +      -
     79E  ARG*     3.2    21.1    +      -       -      +
     83E  LEU*     3.7     2.8    -      -       -      +
    136E  SER*     4.1     9.4    -      -       -      -
    141E  ASP*     2.7    32.0    +      -       -      +
    143E  VAL*     1.3    73.8    -      -       -      +
    145E  ASN*     1.3    65.8    +      -       -      +
    147E  ILE*     3.1    11.1    +      -       +      +
    148E  PHE*     3.1    48.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 145 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133E  PHE*     3.0    67.4    +      -       -      -
    136E  SER*     3.1    17.9    +      -       -      +
    137E  ASP*     3.8    13.4    -      -       -      +
    141E  ASP      3.0    12.6    +      -       -      +
    142E  SER*     3.4    16.1    -      -       -      +
    144E  THR*     1.3    76.9    -      -       -      +
    146E  ASP*     1.3    57.7    +      -       -      +
    148E  PHE*     3.3     2.9    +      -       -      +
    149E  ASN*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142E  SER      2.9    14.0    +      -       -      +
    143E  VAL*     3.1    10.3    +      -       -      +
    145E  ASN*     1.3    75.8    -      -       -      +
    147E  ILE*     1.3    67.1    +      -       +      +
    149E  ASN*     3.7     6.6    -      -       -      +
    150E  VAL*     3.0    34.5    +      -       +      +
    146I  ASP*     6.1     0.2    -      -       -      +
    149I  ASN*     3.5    16.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 147 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29E  LEU*     5.2     3.4    -      -       +      -
     72E  TYR*     5.6     0.7    -      -       +      -
     75E  GLU*     4.2    38.0    -      -       +      +
     76E  MET*     3.7    33.2    -      -       +      -
     79E  ARG*     3.7    40.4    -      -       +      -
    143E  VAL*     3.1    19.6    +      -       +      +
    144E  THR*     3.1     9.4    +      -       -      +
    146E  ASP*     1.3    76.7    -      -       +      +
    148E  PHE*     1.3    66.0    +      -       +      +
    150E  VAL*     3.8     4.8    -      -       -      +
    151E  ALA*     3.1    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 148 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28E  VAL*     3.8    27.8    -      -       +      -
     29E  LEU*     3.9    22.4    -      -       +      -
     32E  ALA*     4.3     5.8    -      -       +      -
     76E  MET*     3.8    22.7    -      -       +      -
    128E  LEU*     4.7     0.9    -      -       +      -
    129E  PHE*     3.6    51.4    -      +       -      +
    132E  GLY*     3.5    27.8    -      -       -      -
    133E  PHE*     3.9     6.7    -      -       -      +
    144E  THR*     3.1    43.3    +      -       +      -
    145E  ASN      3.7     5.2    -      -       -      +
    147E  ILE*     1.3    80.1    -      -       +      +
    149E  ASN*     1.3    56.8    +      -       -      +
    151E  ALA*     4.0     0.2    -      -       -      +
    152E  LYS*     3.0    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 149 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  SER*     2.7    52.5    +      -       -      -
    143A  VAL*     3.6     8.9    +      -       -      +
    146A  ASP*     3.9    19.6    -      -       -      +
    133E  PHE*     3.8    14.5    -      -       +      -
    145E  ASN*     2.9    18.6    +      -       -      +
    146E  ASP*     3.7     8.5    -      -       -      +
    147E  ILE      3.3     0.2    -      -       -      -
    148E  PHE*     1.3    75.6    -      -       -      +
    150E  VAL*     1.3    66.0    +      -       +      +
    152E  LYS*     3.5     5.8    +      -       -      +
    153E  ALA*     3.2    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 150 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146A  ASP*     5.0    12.1    -      -       -      +
     72E  TYR*     4.2     9.6    +      -       +      +
     75E  GLU*     6.1     0.9    -      -       -      +
    146E  ASP*     3.0    24.4    +      -       +      +
    147E  ILE*     3.8     4.7    -      -       -      +
    149E  ASN*     1.3    73.8    -      -       +      +
    151E  ALA*     1.3    67.4    +      -       -      +
    153E  ALA*     3.4     8.6    +      -       -      +
    154E  SER*     3.4    18.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 151 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72E  TYR*     3.6    33.8    +      -       +      -
     76E  MET*     4.0    10.1    -      -       +      -
    129E  PHE*     3.7    24.7    -      -       +      -
    147E  ILE      3.1    15.4    +      -       -      +
    148E  PHE      4.0     2.2    -      -       -      +
    150E  VAL*     1.3    80.0    -      -       -      +
    152E  LYS*     1.3    62.1    +      -       -      +
    154E  SER*     3.3     4.0    +      -       -      -
    155E  ILE*     3.1    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  ARG*     5.9     0.4    -      -       -      +
    142A  SER*     5.2     4.9    -      -       -      +
    143A  VAL*     4.3    12.3    -      -       +      -
    126E  ALA*     2.9    41.1    +      -       +      +
    127E  ALA*     4.8     0.4    -      -       -      +
    129E  PHE*     3.8    14.5    -      -       +      -
    130E  GLN*     3.3    40.5    -      -       -      +
    133E  PHE*     5.9     2.9    -      -       +      -
    148E  PHE      3.0    20.0    +      -       -      +
    149E  ASN*     3.8     6.1    -      -       -      +
    150E  VAL      3.3     0.2    -      -       -      -
    151E  ALA*     1.3    76.0    -      -       -      +
    153E  ALA*     1.3    63.5    +      -       -      +
    155E  ILE*     4.0     2.4    -      -       -      +
    156E  GLU*     2.8    62.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 153 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  ARG*     4.9     2.3    +      -       -      -
    143A  VAL*     3.6    33.5    -      -       +      +
    147A  ILE*     6.4     0.4    -      -       +      -
    149E  ASN      3.2    10.3    +      -       -      +
    150E  VAL*     3.6    12.1    -      -       -      +
    151E  ALA      3.3     0.2    -      -       -      -
    152E  LYS*     1.3    78.1    -      -       -      +
    154E  SER*     1.3    61.6    +      -       -      +
    156E  GLU*     4.0     3.5    -      -       -      +
    157E  LYS*     3.1    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 154 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68E  GLU*     2.4    33.8    +      -       -      -
     72E  TYR*     3.1    14.6    -      -       -      -
    150E  VAL      3.4     5.2    +      -       -      -
    151E  ALA      3.3     1.8    +      -       -      -
    152E  LYS      3.3     0.4    -      -       -      -
    153E  ALA*     1.3    77.1    -      -       -      +
    155E  ILE*     1.3    65.3    +      -       -      +
    157E  LYS*     3.2     9.4    +      -       -      +
    158E  HIS*     3.0    29.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 155 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68E  GLU*     4.3     5.8    -      -       -      +
     69E  ILE*     3.9    27.8    -      -       +      -
     72E  TYR*     4.3    11.9    -      -       +      -
    122E  PHE*     3.3    51.6    -      -       +      +
    125E  LEU*     4.6     7.9    -      -       +      -
    126E  ALA*     4.4    10.3    -      -       +      +
    129E  PHE*     3.8    18.6    -      -       +      -
    151E  ALA      3.1    16.9    +      -       -      +
    152E  LYS*     4.1     4.5    -      -       -      +
    154E  SER*     1.3    73.9    -      -       -      +
    156E  GLU*     1.3    62.7    +      -       -      +
    158E  HIS*     3.2    12.4    +      -       +      +
    159E  ILE*     3.0    21.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 156 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  ARG*     2.7    48.2    +      -       -      +
     82A  THR*     3.4    10.8    -      -       +      +
    143A  VAL*     4.5     1.7    -      -       -      +
    126E  ALA*     4.1    15.7    -      -       +      +
    152E  LYS*     2.8    57.6    +      -       -      +
    153E  ALA      4.0     1.3    -      -       -      +
    155E  ILE*     1.3    76.4    -      -       -      +
    157E  LYS*     1.3    61.5    +      -       -      +
    159E  ILE*     3.2    10.7    +      -       +      +
    160E  TRP      3.1    18.4    +      -       -      -
    172E  LEU*     3.6    29.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 157 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  GLU*     5.0    10.5    +      -       -      +
     78A  GLU*     2.7    34.9    +      -       -      +
     79A  ARG*     5.4     0.4    -      -       -      +
     82A  THR*     4.3    10.0    -      -       -      +
    153E  ALA      3.1    14.5    +      -       -      +
    154E  SER*     3.2    13.2    +      -       -      +
    156E  GLU*     1.3    76.5    -      -       -      +
    158E  HIS*     1.3    69.0    +      -       +      +
    160E  TRP*     3.2    22.6    +      -       +      +
    161E  MET*     3.2    40.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 158 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65E  TYR*     3.7    36.0    +      +       +      +
     68E  GLU*     2.8    32.4    +      -       -      -
    122E  PHE*     3.8    23.1    -      +       +      -
    154E  SER*     3.0    29.3    +      -       -      -
    155E  ILE*     3.2    13.2    +      -       +      +
    157E  LYS*     1.3    79.3    -      -       +      +
    159E  ILE*     1.3    60.8    +      -       -      +
    161E  MET*     3.1    14.7    +      -       -      +
    162E  LEU*     2.8    34.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 159 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119E  VAL*     4.0     9.0    -      -       +      +
    122E  PHE*     3.8    22.7    -      -       +      +
    123E  ARG*     3.8    43.5    -      -       +      +
    126E  ALA*     4.5     5.6    -      -       +      -
    155E  ILE*     3.0    21.3    +      -       +      +
    156E  GLU*     3.2    10.9    +      -       -      +
    158E  HIS*     1.3    71.2    -      -       -      +
    160E  TRP*     1.3    68.5    +      -       -      +
    162E  LEU*     4.5     6.5    -      -       -      -
    163E  GLN*     2.9    37.0    +      -       +      +
    170E  PRO      3.8    22.2    -      -       -      +
    172E  LEU*     4.0    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 160 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78A  GLU*     3.3    35.2    -      -       +      -
     81A  ILE*     3.4    36.0    -      -       +      +
     82A  THR*     3.3    33.2    -      -       +      +
     47C  HIS      4.9     0.2    -      -       -      -
     48C  TRP      4.6     6.3    +      -       -      -
     50C  MET      5.5     0.8    +      -       -      -
     51C  ARG*     6.4     0.2    -      -       -      -
     55C  PHE*     4.0    18.8    -      +       -      -
     59C  HIS*     3.7    24.7    -      +       -      -
    107C  TYR*     6.0     0.2    -      -       -      -
    156E  GLU      3.1     9.0    +      -       -      +
    157E  LYS*     3.2    46.4    -      -       +      +
    158E  HIS      3.2     0.2    -      -       -      -
    159E  ILE*     1.3    77.7    -      -       -      +
    161E  MET*     1.3    67.7    +      -       +      +
    163E  GLN*     3.6     1.9    -      -       -      +
    164E  ALA*     2.9    31.6    +      -       +      +
    168E  GLN      5.0     0.3    -      -       -      +
    170E  PRO*     4.1    23.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 161 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78A  GLU*     4.9     0.2    -      -       -      +
     55C  PHE*     3.6    26.5    -      -       +      -
     56C  MET*     3.7    27.5    -      -       +      +
     59C  HIS*     3.2    37.7    -      -       +      +
     65E  TYR*     5.5     0.9    -      -       -      +
    157E  LYS*     3.2    28.9    +      -       -      +
    158E  HIS*     3.1    17.5    +      -       -      +
    160E  TRP*     1.3    98.3    -      -       +      +
    162E  LEU*     1.3    58.9    +      -       +      +
    164E  ALA*     3.3     3.1    +      -       -      +
    165E  GLU*     3.0    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 162 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58E  TRP*     3.6    31.4    -      -       +      -
     65E  TYR*     3.7    15.0    -      -       +      +
    115E  LEU*     4.0    27.4    -      -       +      +
    118E  VAL*     3.9    16.8    -      -       +      -
    119E  VAL*     3.5    22.9    -      -       +      -
    122E  PHE*     3.8    31.0    -      -       +      -
    158E  HIS      2.8    22.0    +      -       -      +
    159E  ILE      3.9     1.6    -      -       -      +
    161E  MET*     1.3    69.3    -      -       -      +
    163E  GLN*     1.3    66.5    +      -       -      +
    165E  GLU*     3.2     8.0    +      -       -      +
    166E  LEU*     3.0    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 163 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116E  ALA*     5.8     0.2    -      -       -      -
    119E  VAL*     3.6    21.1    -      -       +      +
    123E  ARG*     3.5    17.6    -      -       -      +
    159E  ILE*     2.9    29.2    +      -       +      +
    160E  TRP      3.6     2.9    -      -       -      +
    162E  LEU*     1.3    76.4    -      -       -      +
    164E  ALA*     1.3    57.5    +      -       -      +
    166E  LEU*     2.9    25.9    +      -       -      +
    167E  GLY      3.0     0.3    +      -       -      -
    168E  GLN*     2.9    55.5    +      -       -      +
    169E  ALA      2.7    34.5    +      -       -      +
    170E  PRO*     3.9    11.0    -      -       +      +
    171E  LYS*     3.7     3.8    -      -       -      +
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Residues in contact with ALA 164 (chain E). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     50C  MET      3.8     9.2    -      -       -      +
     51C  ARG*     3.5     9.0    -      -       +      +
     52C  GLY      2.6    32.0    +      -       -      -
     55C  PHE*     3.7    31.4    -      -       +      -
    160E  TRP*     2.9    24.6    +      -       +      +
    161E  MET      3.5     5.4    -      -       -      +
    163E  GLN*     1.3    73.6    -      -       -      +
    165E  GLU*     1.3    60.0    +      -       -      +
    167E  GLY      3.0     4.2    +      -       -      -
    168E  GLN      3.5     8.4    +      -       -      +
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Residues in contact with GLU 165 (chain E). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52C  GLY      3.7     5.4    -      -       -      -
     53C  ARG*     2.9    47.8    +      -       -      +
     54C  GLY*     2.9    24.8    +      -       -      -
     55C  PHE*     3.3     5.6    +      -       +      +
     56C  MET*     2.9    35.0    +      -       -      +
     57E  ILE*     4.9     0.8    -      -       -      +
     58E  TRP*     3.5    33.6    +      -       +      -
    115E  LEU*     3.8    14.6    -      -       +      -
    161E  MET      3.0    13.7    +      -       -      +
    162E  LEU      3.2    10.1    +      -       -      +
    164E  ALA*     1.3    75.4    -      -       -      +
    166E  LEU*     1.3    57.4    +      -       -      +
    167E  GLY      3.2     3.2    +      -       -      -
    173E  EPE      4.8     2.8    +      -       -      -
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Residues in contact with LEU 166 (chain E). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53C  ARG*     5.1     1.1    -      -       -      +
    112E  GLU*     3.6    48.0    -      -       +      +
    115E  LEU*     4.0    18.4    -      -       +      +
    116E  ALA*     3.8    32.1    -      -       +      +
    119E  VAL*     4.6     2.7    -      -       +      -
    162E  LEU      3.0    15.4    +      -       -      +
    163E  GLN*     2.9    27.8    +      -       -      +
    165E  GLU*     1.3    75.9    -      -       -      +
    167E  GLY*     1.3    60.2    +      -       -      +
    168E  GLN*     3.3    26.7    +      -       -      +
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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