Contacts of the helix formed by residues 141 - 166 (chain A) 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 A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  LEU*     3.8    26.8    -      -       +      +
     25A  SER*     3.8    19.6    -      -       -      +
     79A  ARG*     3.1    21.7    +      -       -      -
     83A  LEU*     3.2    19.9    -      -       -      +
    136A  SER*     2.9    12.1    +      -       -      +
    139A  GLU      3.2     1.6    +      -       -      -
    140A  GLY*     1.3    72.5    -      -       -      +
    142A  SER*     1.3    58.3    +      -       -      +
    143A  VAL      3.9     0.5    +      -       -      -
    144A  THR*     2.8    31.3    +      -       -      -
    145A  ASN*     3.0    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 142 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  ASP*     6.4     0.2    -      -       -      +
    140A  GLY      3.1     8.6    +      -       -      -
    141A  ASP*     1.3    73.5    +      -       -      +
    143A  VAL*     1.3    63.3    +      -       -      +
    145A  ASN*     3.3    10.3    -      -       -      +
    146A  ASP      3.1    18.5    +      -       -      -
    130E  GLN*     5.0     5.9    +      -       -      -
    133E  PHE*     3.3    42.4    -      -       -      -
    149E  ASN*     2.7    36.0    +      -       -      -
    152E  LYS*     5.2     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 143 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  ARG*     3.5    40.8    -      -       -      +
    141A  ASP*     3.3     1.0    +      -       -      -
    142A  SER*     1.3    76.5    +      -       -      +
    144A  THR*     1.3    65.7    +      -       -      +
    146A  ASP*     3.2     6.7    +      -       -      +
    147A  ILE*     3.2    28.0    +      -       +      +
    149E  ASN*     3.6    20.6    -      -       -      +
    152E  LYS*     4.3    17.0    -      -       +      -
    153E  ALA*     3.6    42.8    -      -       +      +
    156E  GLU*     4.5     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 144 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25A  SER*     4.6     5.2    -      -       -      -
     29A  LEU*     4.0    21.1    -      -       +      -
     79A  ARG*     3.2    18.4    +      -       -      +
     83A  LEU*     3.9     1.6    -      -       -      +
    136A  SER*     4.0     9.9    -      -       -      -
    141A  ASP*     2.8    34.1    +      -       -      +
    142A  SER      3.5     0.2    -      -       -      -
    143A  VAL*     1.3    78.4    -      -       -      +
    145A  ASN*     1.3    63.3    +      -       -      +
    147A  ILE*     3.3    11.6    +      -       -      +
    148A  PHE*     3.1    53.5    +      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 145 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  PHE*     2.8    67.9    +      -       -      -
    136A  SER*     3.3    10.5    +      -       -      +
    137A  ASP*     3.6    16.7    -      -       -      +
    141A  ASP      3.0    15.7    +      -       -      +
    142A  SER*     3.3    16.2    -      -       -      +
    143A  VAL      3.2     0.2    -      -       -      -
    144A  THR*     1.3    77.2    -      -       -      +
    146A  ASP*     1.3    58.8    +      -       -      +
    148A  PHE*     3.5     2.1    +      -       -      +
    149A  ASN*     3.0    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142A  SER      3.1     6.7    +      -       -      -
    143A  VAL*     3.2     7.8    +      -       -      +
    145A  ASN*     1.3    75.9    +      -       -      +
    147A  ILE*     1.3    64.8    +      -       -      +
    149A  ASN*     4.2     8.6    +      -       -      +
    150A  VAL*     2.9    42.2    +      -       -      +
    149E  ASN*     3.9    21.8    +      -       -      +
    150E  VAL*     5.0    12.6    -      -       -      +
    146I  ASP*     3.9    18.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 147 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  LEU*     5.3     2.7    -      -       +      -
     72A  TYR*     5.5     3.0    -      -       +      -
     75A  GLU*     3.9    36.8    -      -       +      +
     76A  MET*     3.7    32.8    -      -       +      -
     79A  ARG*     3.8    38.8    -      -       +      -
    143A  VAL*     3.2    22.1    +      -       +      +
    144A  THR*     3.3     9.4    +      -       +      +
    146A  ASP*     1.3    76.9    -      -       +      +
    148A  PHE*     1.3    62.2    -      -       +      +
    150A  VAL*     3.4     4.5    +      -       -      +
    151A  ALA*     3.2    20.6    +      -       -      +
    153E  ALA*     6.4     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 148 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  VAL*     3.9    20.2    -      -       +      -
     29A  LEU*     3.7    24.5    -      -       +      -
     32A  ALA*     4.4     6.3    -      -       +      -
     76A  MET*     3.8    18.6    -      -       +      -
    128A  LEU*     4.7     0.7    -      -       +      -
    129A  PHE*     3.5    52.6    -      +       -      +
    132A  GLY*     3.5    33.7    -      -       -      -
    133A  PHE*     3.9     6.5    -      -       -      +
    136A  SER*     4.4     0.2    -      -       -      -
    144A  THR*     3.1    46.8    +      -       +      -
    145A  ASN      3.9     4.0    -      -       -      +
    147A  ILE*     1.3    76.0    -      -       +      +
    149A  ASN*     1.3    57.9    +      -       -      +
    151A  ALA*     3.5     0.8    +      -       -      +
    152A  LYS*     3.0    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 149 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  PHE*     3.6    18.5    -      -       +      -
    145A  ASN*     3.0    18.1    +      -       -      +
    146A  ASP*     3.1    11.5    +      -       -      +
    148A  PHE*     1.3    76.2    -      -       -      +
    150A  VAL*     1.3    59.0    +      -       +      +
    152A  LYS*     3.4     6.1    +      -       -      +
    153A  ALA*     3.0    29.3    +      -       -      +
    142I  SER*     3.1    45.5    +      -       -      -
    143I  VAL*     3.5    12.9    +      -       -      +
    146I  ASP*     3.8    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 150 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  TYR*     5.1     8.5    -      -       +      +
    146A  ASP*     2.9    39.4    +      -       -      +
    147A  ILE*     3.9     4.7    -      -       -      +
    149A  ASN*     1.3    76.0    -      -       -      +
    151A  ALA*     1.3    61.7    +      -       -      +
    153A  ALA*     3.4     9.0    +      -       +      +
    154A  SER*     3.3    21.1    +      -       -      -
    146I  ASP*     5.5     5.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  TYR*     3.6    34.0    +      -       +      -
     76A  MET*     4.0     8.7    -      -       +      -
    129A  PHE*     3.5    26.2    -      -       +      -
    147A  ILE      3.2    16.8    +      -       -      +
    148A  PHE      3.9     2.0    -      -       -      +
    150A  VAL*     1.3    77.2    -      -       -      +
    152A  LYS*     1.3    63.4    +      -       -      +
    154A  SER      3.3     1.0    +      -       -      -
    155A  ILE*     3.1    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 152 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  ALA*     4.1    19.5    -      -       +      +
    129A  PHE*     3.8    15.4    -      -       +      +
    130A  GLN*     3.1    41.0    +      -       -      +
    133A  PHE*     5.8     2.5    -      -       +      -
    148A  PHE      3.0    18.4    +      -       -      +
    149A  ASN*     3.8     8.5    -      -       -      +
    150A  VAL      3.3     0.2    -      -       -      -
    151A  ALA*     1.3    73.2    -      -       -      +
    153A  ALA*     1.3    66.8    +      -       -      +
    155A  ILE*     3.9     2.6    -      -       -      +
    156A  GLU*     3.0    62.3    +      -       +      +
     79I  ARG*     3.9     6.7    -      -       -      +
    141I  ASP*     4.9     2.8    +      -       -      +
    142I  SER*     4.8     5.8    +      -       -      +
    143I  VAL*     3.5    18.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 153 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  ASN      3.0    17.2    +      -       -      +
    150A  VAL*     3.5     9.9    -      -       +      +
    152A  LYS*     1.3    77.5    -      -       -      +
    154A  SER*     1.3    60.5    +      -       -      +
    156A  GLU*     4.0     3.4    -      -       -      +
    157A  LYS*     3.2    22.7    +      -       -      +
     79I  ARG*     4.8     2.3    +      -       -      -
    143I  VAL*     3.5    32.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 154 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  GLU*     2.6    31.8    +      -       -      -
     72A  TYR*     3.2    13.9    -      -       -      -
    150A  VAL      3.3     6.4    +      -       -      -
    151A  ALA      3.9     0.2    -      -       -      -
    152A  LYS      3.3     0.6    -      -       -      -
    153A  ALA*     1.3    77.5    -      -       -      +
    155A  ILE*     1.3    67.0    +      -       -      +
    157A  LYS*     3.2    12.0    +      -       -      +
    158A  HIS*     3.0    30.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 155 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  GLU*     4.3     9.4    -      -       -      +
     69A  ILE*     3.8    28.3    -      -       +      -
     72A  TYR*     4.3     6.1    -      -       +      -
    122A  PHE*     3.4    54.7    -      -       +      +
    125A  LEU*     4.5     6.1    -      -       +      -
    126A  ALA*     4.1    14.4    -      -       +      +
    129A  PHE*     4.1    14.6    -      -       +      -
    151A  ALA      3.1    21.4    +      -       -      +
    152A  LYS*     3.9     5.2    -      -       -      +
    154A  SER*     1.3    77.1    -      -       -      +
    156A  GLU*     1.3    56.0    +      -       -      +
    158A  HIS*     3.2     8.8    +      -       +      +
    159A  ILE*     2.9    27.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 156 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  ALA*     4.1    20.0    -      -       +      +
    152A  LYS*     3.0    50.3    +      -       -      +
    153A  ALA      4.0     0.7    -      -       -      +
    155A  ILE*     1.3    74.5    -      -       -      +
    157A  LYS*     1.3    64.6    +      -       -      +
    159A  ILE*     3.2     8.9    +      -       +      +
    160A  TRP      3.0    18.4    +      -       -      -
    172A  LEU*     3.9    25.6    -      -       +      +
     79I  ARG*     2.6    47.8    +      -       -      +
     82I  THR*     3.4    16.2    -      -       +      +
    143I  VAL*     4.1     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 157 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  ALA      3.2    14.1    +      -       -      +
    154A  SER*     3.2    14.7    +      -       -      +
    156A  GLU*     1.3    74.3    -      -       -      +
    158A  HIS*     1.3    67.5    +      -       +      +
    160A  TRP*     3.2    23.3    +      -       +      +
    161A  MET*     3.0    35.4    +      -       +      +
     75I  GLU*     4.5    23.4    +      -       -      +
     78I  GLU*     3.3    34.9    +      -       +      +
     79I  ARG*     5.3     0.4    -      -       -      +
     82I  THR*     4.3    11.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 158 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  LYS*     6.2     1.3    -      -       -      -
     65A  TYR*     3.6    33.8    +      +       +      +
     68A  GLU*     2.7    35.8    +      -       -      -
    122A  PHE*     3.6    24.5    -      +       +      -
    154A  SER*     3.0    28.3    +      -       -      -
    155A  ILE*     3.2    11.9    +      -       +      +
    157A  LYS*     1.3    76.7    -      -       +      +
    159A  ILE*     1.3    61.0    +      -       -      +
    161A  MET*     3.1    15.7    +      -       -      +
    162A  LEU*     2.8    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 159 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  VAL*     4.3     7.9    -      -       +      +
    122A  PHE*     3.7    24.7    -      -       +      +
    123A  ARG*     3.8    42.8    -      -       +      +
    126A  ALA*     4.4     7.0    -      -       +      -
    155A  ILE*     2.9    22.9    +      -       +      +
    156A  GLU*     3.2    14.8    +      -       -      +
    158A  HIS*     1.3    75.7    -      -       -      +
    160A  TRP*     1.3    62.2    +      -       -      +
    162A  LEU*     4.5     6.3    -      -       -      -
    163A  GLN*     2.9    30.9    +      -       +      +
    170A  PRO      3.8    22.0    -      -       -      +
    172A  LEU*     4.0    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 160 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  GLU      3.0     9.8    +      -       -      +
    157A  LYS*     3.4    26.9    -      -       +      +
    159A  ILE*     1.3    78.5    -      -       -      +
    161A  MET*     1.3    75.9    +      -       +      +
    163A  GLN*     3.8     1.2    -      -       -      +
    164A  ALA*     2.8    37.5    +      -       +      +
    168A  GLN      5.0     0.8    -      -       -      +
    170A  PRO*     4.1    27.2    -      -       +      +
     78I  GLU*     3.4    45.8    -      -       +      -
     81I  ILE*     3.4    35.3    -      -       +      +
     82I  THR*     3.5    28.5    -      -       +      +
     47K  HIS      4.9     0.4    -      -       -      -
     48K  TRP      4.6     7.8    +      -       -      -
     50K  MET      5.4     0.6    +      -       -      -
     55K  PHE*     3.9    13.1    -      +       -      -
     59K  HIS*     3.5    25.1    -      +       -      -
    107K  TYR*     5.9     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 161 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  LYS*     6.3     0.7    -      -       -      -
     65A  TYR*     5.5     2.2    -      -       -      +
    157A  LYS*     3.0    26.9    +      -       +      +
    158A  HIS*     3.8    17.0    -      -       -      +
    160A  TRP*     1.3   104.7    -      -       +      +
    162A  LEU*     1.3    63.4    +      -       -      +
    164A  ALA*     3.2     3.5    +      -       -      +
    165A  GLU*     3.0    20.6    +      -       -      +
     78I  GLU*     4.9     2.0    -      -       -      +
     55K  PHE*     3.7    29.1    -      -       +      -
     56K  MET*     3.7    23.5    -      -       +      +
     59K  HIS*     3.5    26.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 162 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  TRP*     3.7    29.8    -      -       +      -
     65A  TYR*     3.8    13.9    -      -       +      +
    115A  LEU*     4.0    29.2    -      -       +      +
    118A  VAL*     3.7    26.9    -      -       +      -
    119A  VAL*     3.5    23.1    -      -       +      -
    122A  PHE*     3.8    20.6    -      -       +      -
    158A  HIS      2.8    24.4    +      -       -      +
    159A  ILE      3.9     1.8    -      -       -      +
    161A  MET*     1.3    73.3    -      -       -      +
    163A  GLN*     1.3    62.9    +      -       -      +
    165A  GLU*     3.1     9.1    +      -       -      +
    166A  LEU*     3.1    25.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 163 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119A  VAL*     3.7    20.6    -      -       +      +
    123A  ARG*     3.2    29.2    -      -       -      +
    159A  ILE*     2.9    25.5    +      -       +      +
    160A  TRP      3.8     2.2    -      -       -      +
    162A  LEU*     1.3    75.7    -      -       -      +
    164A  ALA*     1.3    61.9    +      -       -      +
    166A  LEU*     3.0    22.4    +      -       -      +
    167A  GLY      3.0     0.2    +      -       -      -
    168A  GLN*     2.9    51.3    +      -       -      +
    169A  ALA      3.0    31.6    +      -       -      +
    170A  PRO*     3.8     8.5    -      -       +      +
    171A  LYS*     3.3     7.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 164 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160A  TRP*     2.8    26.3    +      -       +      +
    161A  MET      3.4     6.3    -      -       -      +
    162A  LEU      3.2     0.2    -      -       -      -
    163A  GLN*     1.3    73.6    -      -       -      +
    165A  GLU*     1.3    57.7    +      -       -      +
    167A  GLY      3.0     5.2    +      -       -      -
    168A  GLN      3.5     9.5    +      -       -      +
     50K  MET      3.9     8.7    -      -       -      +
     51K  ARG*     3.4     7.6    -      -       +      -
     52K  GLY      2.7    31.9    +      -       -      -
     55K  PHE*     3.7    30.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  TRP*     3.6    35.0    +      -       +      -
    115A  LEU*     3.9    13.0    -      -       +      -
    161A  MET      3.0    12.9    +      -       -      +
    162A  LEU*     3.1    10.1    +      -       -      +
    164A  ALA*     1.3    75.2    -      -       -      +
    166A  LEU*     1.3    58.6    +      -       -      +
    167A  GLY      3.4     1.0    +      -       -      -
     52K  GLY      3.2    22.8    -      -       -      -
     53K  ARG*     2.8    42.0    +      -       -      +
     54K  GLY*     2.9    20.3    +      -       -      -
     55K  PHE*     3.2     7.8    +      -       +      +
     56K  MET*     3.0    29.3    +      -       -      +
    173K  EPE      4.4     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  GLU*     3.7    46.6    -      -       +      +
    115A  LEU*     3.9    23.3    -      -       +      -
    116A  ALA*     4.0    28.0    -      -       +      +
    119A  VAL*     4.3     4.3    -      -       +      -
    162A  LEU      3.1    11.8    +      -       -      +
    163A  GLN*     3.0    28.9    +      -       -      +
    165A  GLU*     1.3    78.8    -      -       +      +
    167A  GLY*     1.3    57.3    +      -       -      +
    168A  GLN*     3.1    30.9    +      -       -      +
     53K  ARG*     5.0     1.8    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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