Contacts of the helix formed by residues 141 - 165 (chain I) in PDB entry 1L8I


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 I).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  ARG*     4.4    10.7    -      -       -      +
     21I  VAL*     5.5     5.5    -      -       +      +
     25I  GLU*     4.2    13.1    +      -       +      -
     29I  THR*     3.8    15.8    +      -       -      +
     83I  ARG*     2.6    34.7    +      -       -      -
     87I  LEU*     4.1     9.8    -      -       +      +
    139I  ALA*     3.4     1.7    -      -       -      +
    140I  LYS*     1.3    77.0    -      -       -      +
    142I  ASP*     1.3    69.2    +      -       -      +
    143I  ASP*     3.4     4.2    +      -       -      +
    144I  THR*     2.7    26.7    +      -       -      +
    145I  ALA*     2.9    22.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 142 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  ARG*     4.2     9.5    -      -       +      +
    136A  ILE*     4.0    41.1    -      -       +      +
    137A  GLY*     4.4     9.5    +      -       -      -
    149A  THR*     4.3     5.4    -      -       +      +
    140I  LYS      3.3     8.0    +      -       -      +
    141I  ASP*     1.3    73.4    +      -       -      +
    143I  ASP*     1.3    64.4    +      -       -      +
    145I  ALA*     3.1    17.7    +      -       -      +
    146I  ASP*     3.1    13.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 143 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  ARG*     4.2     2.9    -      -       -      -
    136A  ILE*     3.5    17.4    -      -       -      +
    149A  THR*     3.5    19.0    -      -       -      +
    152A  SER*     2.9    27.9    +      -       -      -
    153A  ARG*     3.6    21.3    +      -       -      +
    156A  ASP*     3.4     6.2    -      -       -      +
     83I  ARG*     3.0    40.7    +      -       -      +
    141I  ASP*     3.3     2.9    +      -       -      -
    142I  ASP*     1.3    77.1    -      -       -      +
    144I  THR*     1.3    61.2    +      -       -      +
    146I  ASP*     3.0     6.9    +      -       -      +
    147I  ILE*     3.0    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 144 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29I  THR*     3.3    23.8    -      -       +      +
     32I  LEU*     5.2     2.5    -      -       +      -
     33I  LEU*     3.5    32.3    -      -       +      -
     83I  ARG*     3.6     9.0    +      -       +      +
    139I  ALA*     4.5     7.2    -      -       +      -
    141I  ASP*     2.7    34.3    +      -       -      -
    143I  ASP*     1.3    78.4    -      -       -      +
    145I  ALA*     1.3    62.9    -      -       -      +
    147I  ILE*     3.2    11.3    +      -       +      +
    148I  LEU*     3.0    33.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 145 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136I  ILE*     3.8    23.6    -      -       +      +
    139I  ALA*     4.1    17.4    -      -       -      +
    141I  ASP      2.9    12.0    +      -       -      +
    142I  ASP*     3.3    12.8    -      -       -      +
    144I  THR*     1.3    75.5    -      -       -      +
    146I  ASP*     1.3    53.6    +      -       -      +
    148I  LEU*     3.3     6.6    +      -       -      +
    149I  THR*     2.7    36.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 146 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146A  ASP*     4.1     5.2    -      -       -      +
    149A  THR*     3.8    25.0    -      -       +      +
    150A  ALA      5.5     0.2    +      -       -      -
    153A  ARG*     3.2    19.0    +      -       -      +
    301A  TRS      2.6    49.0    +      -       -      -
    146E  ASP*     4.1     5.2    -      -       -      +
    142I  ASP      3.1     5.7    +      -       -      +
    143I  ASP      3.0    10.2    +      -       -      +
    145I  ALA*     1.3    74.6    -      -       -      +
    147I  ILE*     1.3    67.5    +      -       -      +
    149I  THR*     2.8    19.3    +      -       -      -
    150I  ALA*     2.9    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 147 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  ARG*     3.4    41.7    -      -       +      +
     33I  LEU*     5.1     2.2    -      -       +      -
     76I  HIS*     4.7     3.5    +      -       -      +
     79I  THR*     4.1    18.8    -      -       +      +
     80I  MET*     3.6    31.4    -      -       +      -
     83I  ARG*     3.5    42.6    -      -       +      -
    143I  ASP      3.0    17.2    +      -       -      +
    144I  THR*     3.4    10.3    -      -       +      +
    146I  ASP*     1.3    74.1    +      -       -      +
    148I  LEU*     1.3    59.9    +      -       +      +
    150I  ALA*     3.5     3.8    +      -       -      +
    151I  ALA*     3.1    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 148 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32I  LEU*     4.4     7.6    -      -       +      -
     33I  LEU*     4.6     7.0    -      -       +      -
     36I  GLN*     4.1    13.0    -      -       +      -
     80I  MET*     4.0    23.1    -      -       -      -
    132I  VAL*     4.0    21.8    -      -       +      +
    135I  ALA*     3.9    28.7    -      -       +      +
    136I  ILE*     3.9    15.1    -      -       +      +
    139I  ALA*     3.9    15.5    -      -       +      -
    144I  THR*     3.0    28.8    +      -       +      +
    145I  ALA      3.5     7.2    -      -       -      +
    147I  ILE*     1.3    74.8    -      -       +      +
    149I  THR*     1.3    55.0    +      -       -      +
    151I  ALA*     3.4     3.9    +      -       -      +
    152I  SER*     2.7    35.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 149 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301A  TRS      5.8     0.2    -      -       -      -
    142E  ASP*     4.5     4.6    -      -       +      +
    143E  ASP*     3.6    19.6    -      -       -      +
    146E  ASP*     3.8    37.2    -      -       +      +
    136I  ILE*     3.4    23.9    -      -       +      +
    145I  ALA*     2.7    20.9    +      -       -      +
    146I  ASP*     2.8    12.5    +      -       -      -
    148I  LEU*     1.3    74.5    -      -       -      +
    150I  ALA*     1.3    60.6    +      -       -      +
    152I  SER      3.1     0.2    +      -       -      -
    153I  ARG*     2.8    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 150 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153A  ARG*     4.9     7.2    -      -       -      +
    301A  TRS      4.2    25.3    +      -       -      +
    146E  ASP*     5.5     0.2    -      -       -      -
     76I  HIS*     3.4    18.5    -      -       +      +
    146I  ASP      2.9    10.6    +      -       -      +
    147I  ILE*     3.7     9.9    -      -       -      +
    149I  THR*     1.3    77.0    -      -       -      +
    151I  ALA*     1.3    63.1    +      -       -      +
    153I  ARG*     3.5     8.2    +      -       -      +
    154I  ASP*     3.3    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40I  PHE*     4.2    16.4    -      -       +      -
     76I  HIS*     3.4    32.7    -      -       +      +
     80I  MET*     4.9     6.3    -      -       +      -
    132I  VAL*     4.7     3.8    -      -       +      -
    147I  ILE*     3.1    18.2    +      -       +      +
    148I  LEU*     3.6     7.9    -      -       -      +
    150I  ALA*     1.3    77.4    -      -       -      +
    152I  SER*     1.3    63.7    +      -       -      +
    154I  ASP*     3.2     4.5    +      -       -      +
    155I  LEU*     3.0    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 152 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143E  ASP*     3.0    25.1    +      -       -      -
    132I  VAL*     3.9    21.5    -      -       -      +
    133I  ARG*     3.6    19.5    -      -       -      +
    136I  ILE*     3.7     9.9    -      -       -      -
    148I  LEU      2.7    22.2    +      -       -      -
    149I  THR      3.7     0.2    -      -       -      -
    151I  ALA*     1.3    71.6    -      -       -      +
    153I  ARG*     1.3    65.9    +      -       -      +
    155I  LEU*     3.0     3.0    +      -       -      +
    156I  ASP*     2.9    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 153 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301A  TRS      4.4     8.2    +      -       -      -
     79E  THR*     3.6    20.6    -      -       -      +
     83E  ARG*     5.2     3.1    -      -       -      +
     86E  GLN*     4.7     4.8    +      -       -      +
    143E  ASP*     3.7    29.1    +      -       +      +
    146E  ASP*     3.1    26.3    +      -       -      -
    147E  ILE*     3.6    44.5    -      -       +      +
    150E  ALA*     4.8    10.5    -      -       -      +
    149I  THR      2.8    19.3    +      -       -      +
    150I  ALA*     3.6     9.6    -      -       -      +
    152I  SER*     1.3    73.9    -      -       -      +
    154I  ASP*     1.3    61.9    -      -       -      +
    156I  ASP*     3.8     3.5    +      -       -      +
    157I  LYS*     3.5    17.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 154 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72I  ALA*     4.0    10.6    -      -       -      +
     76I  HIS*     2.7    36.4    +      -       +      +
    150I  ALA      3.3     4.8    +      -       -      +
    151I  ALA      3.2     4.4    +      -       -      +
    152I  SER      3.0     0.6    -      -       -      -
    153I  ARG*     1.3    79.5    -      -       -      +
    155I  LEU*     1.3    60.9    +      -       +      +
    157I  LYS*     3.0    11.9    +      -       -      +
    158I  PHE*     2.9    53.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 155 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40I  PHE*     3.5    31.6    -      -       +      -
     43I  LEU*     4.1    16.2    -      -       +      -
     73I  LEU*     4.2    15.5    -      -       +      -
     76I  HIS*     5.1     1.3    -      -       +      -
    125I  TYR*     4.3     8.8    -      -       +      +
    128I  VAL*     3.6    31.4    -      -       +      +
    129I  ALA*     3.8    26.3    -      -       +      +
    132I  VAL*     4.9     0.9    -      -       +      -
    151I  ALA*     3.0    25.6    +      -       -      +
    152I  SER*     3.0     8.8    +      -       -      +
    154I  ASP*     1.3    79.3    -      -       +      +
    156I  ASP*     1.3    58.9    +      -       -      +
    158I  PHE*     3.6     7.9    -      -       +      +
    159I  LEU*     2.9    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 156 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19E  ASN*     3.5    18.6    +      -       -      +
     83E  ARG*     2.8    37.5    +      -       -      +
     86E  GLN*     3.9    11.0    -      -       -      +
    143E  ASP*     3.4     7.7    -      -       -      +
    129I  ALA*     3.7    12.1    -      -       -      +
    133I  ARG*     2.7    35.2    +      -       -      -
    152I  SER*     2.9    19.9    +      -       -      +
    153I  ARG      4.2     1.1    -      -       -      +
    155I  LEU*     1.3    76.2    -      -       -      +
    157I  LYS*     1.3    61.0    +      -       -      +
    159I  LEU*     3.8     6.6    +      -       -      +
    160I  TRP*     3.2    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 157 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82E  GLU*     4.1    15.1    +      -       -      -
     86E  GLN*     3.7    21.7    -      -       -      +
    207E    K      3.7    13.0    -      -       -      -
    153I  ARG      3.5    10.7    +      -       -      +
    154I  ASP*     3.0    16.4    +      -       -      +
    156I  ASP*     1.3    78.4    -      -       -      +
    158I  PHE*     1.3    76.0    +      -       +      +
    160I  TRP*     3.2    14.4    +      -       +      +
    161I  PHE*     2.9    54.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 158 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68I  GLY      5.1     0.7    -      -       -      -
     69I  PHE*     3.4    49.8    -      +       +      -
     72I  ALA*     3.5    29.6    -      -       +      -
     73I  LEU*     3.8    28.5    -      -       +      -
     76I  HIS*     5.7     0.2    -      +       -      -
    125I  TYR*     3.9    19.1    -      +       +      -
    154I  ASP*     2.9    41.7    +      -       +      -
    155I  LEU*     3.6     8.5    -      -       -      +
    157I  LYS*     1.3    88.5    -      -       +      +
    159I  LEU*     1.3    67.6    +      -       -      +
    161I  PHE*     3.0     4.3    +      -       -      +
    162I  ILE*     2.8    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 159 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17E  THR*     4.5     1.6    -      -       -      +
     18E  ARG      4.3     0.4    -      -       -      -
     19E  ASN*     3.9    41.1    -      -       +      +
    122I  ALA*     3.5    28.5    -      -       -      +
    125I  TYR*     4.3     7.7    -      -       +      -
    126I  ALA*     4.0    23.8    -      -       +      +
    129I  ALA*     4.3    12.1    -      -       +      -
    130I  ASN*     5.0     0.2    -      -       -      +
    155I  LEU      2.9    16.8    +      -       -      +
    156I  ASP*     3.9     5.4    -      -       -      +
    158I  PHE*     1.3    75.8    -      -       -      +
    160I  TRP*     1.3    53.6    +      -       -      +
    162I  ILE*     3.3     7.3    +      -       -      +
    163I  GLU*     2.8    62.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 160 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17E  THR*     5.8     0.7    -      -       -      -
     82E  GLU*     3.9    42.0    -      -       +      -
     85E  VAL*     3.5    26.7    -      -       +      +
     86E  GLN*     3.7    31.0    -      -       +      +
     52F  TRP*     3.8    22.8    +      -       -      -
     54F  MET      5.1     1.8    +      -       -      -
     55F  ARG*     4.3    17.3    -      -       -      +
     59F  PHE*     4.3     8.2    -      +       -      -
     63F  HIS*     3.9    15.7    -      -       -      -
    156I  ASP      3.2    11.7    +      -       -      +
    157I  LYS*     3.2    12.8    +      -       +      +
    158I  PHE      3.2     0.2    -      -       -      -
    159I  LEU*     1.3    81.1    -      -       -      +
    161I  PHE*     1.3    89.8    +      +       -      +
    163I  GLU*     3.5     9.6    +      -       +      +
    164I  SER*     2.9    50.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 161 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82E  GLU*     5.7     0.7    -      -       -      -
     59F  PHE*     3.7    16.1    -      +       -      -
     60F  ILE*     3.6    24.7    -      -       +      -
     63F  HIS*     3.7    28.0    -      +       -      -
     64F  GLU*     5.0     4.9    -      -       +      -
     65I  MET*     3.9    13.7    -      -       +      -
     69I  PHE*     3.8    22.9    -      +       +      -
    157I  LYS*     2.9    36.9    +      -       +      +
    158I  PHE      3.4     7.2    -      -       -      +
    160I  TRP*     1.3   106.5    -      +       -      +
    162I  ILE*     1.3    66.7    +      -       -      +
    164I  SER*     3.3     9.0    +      -       -      -
    165I  ASN*     2.9    21.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 162 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65I  MET*     4.4     9.6    -      -       +      -
     66I  LEU*     5.0     4.7    -      -       +      -
     69I  PHE*     3.8    16.8    -      -       +      -
    118I  LEU*     3.5    38.7    -      -       +      +
    121I  LEU*     4.3     9.2    -      -       +      -
    122I  ALA*     4.0    11.7    -      -       +      +
    125I  TYR*     3.5    54.5    -      -       +      -
    158I  PHE      2.8    20.3    +      -       -      +
    159I  LEU*     3.6     5.4    -      -       -      +
    161I  PHE*     1.3    70.3    -      -       -      +
    163I  GLU*     1.3    65.0    +      -       -      +
    165I  ASN*     3.1    16.6    +      -       -      +
    166I  ILE*     3.6     9.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 163 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16E  TYR*     4.2     4.0    -      -       -      +
     17E  THR*     2.8    31.7    +      -       -      -
     18E  ARG*     2.8    60.4    +      -       -      +
     55F  ARG*     4.9    12.4    +      -       -      +
    122I  ALA*     4.4     4.5    -      -       +      -
    159I  LEU*     2.8    35.6    +      -       +      +
    160I  TRP*     3.8     7.9    -      -       -      +
    162I  ILE*     1.3    73.0    -      -       -      +
    164I  SER*     1.3    62.0    +      -       -      +
    166I  ILE*     3.2    29.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 164 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54F  MET      4.2     0.2    +      -       -      -
     55F  ARG*     3.7    25.3    +      -       -      +
     56F  GLY      2.7    32.2    +      -       -      +
     59F  PHE*     3.3    36.2    -      -       -      +
    160I  TRP*     2.9    43.1    +      -       -      -
    162I  ILE      3.2     0.6    -      -       -      -
    163I  GLU*     1.3    76.5    -      -       -      +
    165I  ASN*     1.3    56.4    +      -       -      +
    166I  ILE      3.2     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 165 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56F  GLY      3.8     8.7    -      -       -      +
     57F  ALA*     4.5     5.2    -      -       -      -
     59F  PHE*     3.3    13.8    -      -       -      +
     60F  ILE*     3.2    33.5    -      -       -      +
     58I  ASN*     3.1    27.7    +      -       -      +
     62I  VAL*     4.4     6.3    -      -       +      -
     65I  MET*     3.7    15.1    -      -       -      +
    115I  GLN*     3.0    17.2    +      -       -      -
    118I  LEU*     3.5    21.2    -      -       +      +
    161I  PHE      2.9    18.4    +      -       -      +
    162I  ILE      3.1     6.6    +      -       -      +
    164I  SER*     1.3    77.1    -      -       -      +
    166I  ILE*     1.3    60.3    +      -       -      +
    167I  GLU      3.6     0.5    +      -       -      -
----------------------------------------------------------
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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