Contacts of the helix formed by residues 244 - 270 (chain M) in PDB entry 2QJK


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 PHE 244 (chain M).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32M  THR      4.6     4.0    -      -       -      -
     33M  ILE*     3.4    32.1    -      -       +      +
     34M  MET      3.5     1.8    +      -       -      -
     35M  ILE*     3.0    33.1    +      -       +      +
     37M  THR*     4.0     7.0    -      -       -      -
    217M  HIS*     6.4     0.2    -      +       -      -
    242M  VAL      3.5     0.6    +      -       -      -
    243M  PRO*     1.3    71.3    -      -       -      +
    245M  TRP*     1.3    58.3    +      -       -      +
    247M  TYR      3.2     0.7    +      -       -      -
    248M  PHE*     2.7    72.7    +      +       +      -
    249M  ILE*     3.4    23.1    +      -       +      -
    252M  ASP*     4.5     3.1    -      -       -      -
    505M  ANJ      3.4    77.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with TRP 245 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33M  ILE*     3.2    27.8    +      -       +      +
     34M  MET*     3.5    24.5    -      -       +      +
    243M  PRO*     3.4    22.2    -      -       -      +
    244M  PHE*     1.3    78.4    -      -       -      +
    246M  PRO*     1.3    87.4    -      -       +      +
    247M  TYR      3.4     0.7    -      -       -      -
    249M  ILE*     3.7    41.3    -      -       +      -
    250M  ILE*     5.7     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 246 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243M  PRO*     4.8     0.7    -      -       +      -
    244M  PHE      3.4     1.6    -      -       -      -
    245M  TRP*     1.3   123.1    -      -       +      +
    247M  TYR*     1.3    82.1    +      -       +      +
    248M  PHE      3.4     2.2    -      -       -      -
    249M  ILE*     4.1     1.1    -      -       +      -
    250M  ILE*     3.0    33.4    +      -       +      +
    251N  LEU*     3.7    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 247 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242M  VAL*     3.7    22.0    -      -       +      -
    243M  PRO*     3.2    52.5    -      -       +      +
    244M  PHE      3.2     1.2    +      -       -      -
    246M  PRO*     1.3    88.5    -      -       +      +
    248M  PHE*     1.3    61.6    +      -       -      +
    250M  ILE*     3.8     3.1    +      -       -      +
    251M  LYS      3.6     7.4    +      -       -      -
    251N  LEU*     3.3    40.8    +      -       +      +
    252N  TRP*     3.2    38.7    +      +       +      -
    254N  GLY      5.2     1.6    +      -       -      -
    255N  VAL*     3.8    30.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 248 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37M  THR*     3.2    34.8    -      -       +      -
     38M  PRO      3.2    21.8    -      -       -      -
     39M  ARG      4.6     1.1    -      -       -      -
     41M  LEU*     3.7    24.9    -      -       +      -
    242M  VAL*     4.1    11.0    -      -       +      -
    244M  PHE*     2.7    51.7    +      +       +      -
    247M  TYR*     1.3    71.9    -      -       -      +
    249M  ILE*     1.3    65.7    +      -       -      +
    250M  ILE      2.6     7.4    +      -       -      -
    251M  LYS*     2.8    24.8    +      -       +      +
    252M  ASP*     2.7    30.6    +      -       -      +
    505M  ANJ      4.0    12.1    -      +       -      +
    252N  TRP*     3.7    24.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 249 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33M  ILE*     3.3    29.4    -      -       +      -
    244M  PHE*     3.4    24.0    +      -       +      -
    245M  TRP*     3.7    42.8    -      -       +      -
    246M  PRO      3.5     7.4    +      -       -      +
    248M  PHE*     1.3    76.8    -      -       -      +
    250M  ILE*     1.3    61.6    +      -       +      +
    252M  ASP*     3.5     8.2    -      -       +      +
    253M  VAL*     3.0    40.7    +      -       +      +
    505M  ANJ      4.2     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 250 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245M  TRP*     5.7     2.5    -      -       +      -
    246M  PRO*     3.0    24.7    +      -       +      +
    247M  TYR      3.9     3.6    -      -       -      +
    248M  PHE      2.6     5.3    +      -       -      -
    249M  ILE*     1.3    76.5    -      -       +      +
    251M  LYS*     1.3    56.9    +      -       -      +
    252M  ASP      3.0     1.1    -      -       -      -
    253M  VAL*     2.9     8.6    +      -       +      +
    254M  PHE*     2.5    34.5    +      -       +      +
    244N  LEU*     4.7    11.1    -      -       +      +
    247N  THR*     4.3    20.6    -      -       +      -
    248N  ASN*     3.3    33.4    -      -       +      +
    251N  LEU*     3.6    24.5    -      -       +      -
     16O  TYR*     6.3     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 251 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41M  LEU      3.5    22.8    +      -       -      -
     42M  ASN*     4.4     7.4    +      -       -      +
     43M  TRP*     3.1    41.3    -      -       +      -
     46M  ILE*     5.3     5.2    -      -       +      -
    247M  TYR      3.6     6.8    +      -       -      +
    248M  PHE*     2.8    40.8    +      -       +      +
    250M  ILE*     1.3    76.4    -      -       -      +
    252M  ASP*     1.3    56.8    +      -       -      +
    254M  PHE*     3.2     7.2    -      -       -      +
    255M  ALA*     2.5    38.5    +      -       -      +
    505M  ANJ      5.3     3.8    +      -       -      -
    248N  ASN*     3.4    21.4    +      -       -      +
    252N  TRP*     3.7    21.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 252 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46M  ILE*     5.6     5.6    -      -       -      -
     49M  VAL*     2.8    31.8    -      -       +      +
    244M  PHE*     4.7     2.9    -      -       -      -
    248M  PHE*     2.7    31.5    +      -       -      +
    249M  ILE*     3.5     9.9    -      -       +      +
    251M  LYS*     1.3    76.5    -      -       -      +
    253M  VAL*     1.3    53.8    +      -       +      +
    255M  ALA*     3.6     5.1    -      -       -      +
    256M  LEU*     2.7    40.0    +      -       -      +
    505M  ANJ      2.6    53.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 253 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249M  ILE*     3.0    28.5    +      -       +      +
    250M  ILE*     2.9     8.9    +      -       +      +
    252M  ASP*     1.3    80.8    -      -       +      +
    254M  PHE*     1.3    65.0    +      -       -      +
    256M  LEU*     3.3    15.0    +      -       +      +
    257M  ALA*     3.0    21.7    +      -       +      +
    244N  LEU*     3.7    27.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 254 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43M  TRP*     3.7    35.7    -      +       -      -
    250M  ILE      2.5    17.5    +      -       -      +
    251M  LYS*     2.8    11.2    +      -       -      +
    253M  VAL*     1.3    71.8    -      -       -      +
    255M  ALA*     1.3    67.5    +      -       -      +
    257M  ALA*     3.1    16.8    +      -       -      +
    258M  VAL*     3.3    29.6    +      -       +      +
    241N  SER*     3.8    21.3    -      -       -      -
    244N  LEU*     4.1    24.8    -      -       +      +
    245N  TYR*     3.9    39.5    -      +       +      -
    248N  ASN*     4.4    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 255 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43M  TRP*     4.9     7.6    -      -       +      -
     46M  ILE*     3.7    42.2    -      -       +      -
     50M  VAL*     5.9     0.4    -      -       +      -
    251M  LYS      2.5    18.0    +      -       -      +
    252M  ASP      3.6     2.9    -      -       -      +
    254M  PHE*     1.3    75.7    -      -       -      +
    256M  LEU*     1.3    65.2    +      -       -      +
    258M  VAL*     2.7    23.6    +      -       -      +
    259M  VAL*     2.9    15.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 256 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49M  VAL*     3.3    31.9    -      -       +      -
     50M  VAL*     4.0    22.6    -      -       +      +
     53M  PHE*     4.1    34.5    -      -       +      -
    252M  ASP      2.7    20.4    +      -       -      +
    253M  VAL*     3.4    16.6    -      -       +      +
    255M  ALA*     1.3    71.5    -      -       -      +
    257M  ALA*     1.3    57.3    +      -       -      +
    259M  VAL*     3.5     7.3    -      -       +      +
    260M  LEU*     3.0    42.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 257 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253M  VAL      3.0    11.3    +      -       -      +
    254M  PHE      3.1    11.2    -      -       -      +
    255M  ALA      2.8     1.0    +      -       -      -
    256M  LEU*     1.3    73.6    -      -       -      +
    258M  VAL*     1.3    55.5    +      -       -      +
    260M  LEU*     3.1     6.2    +      -       -      +
    261M  LEU*     2.8    34.8    +      -       -      +
    237N  LEU*     4.0    18.0    -      -       +      +
    240N  LEU*     4.8     3.8    -      -       +      -
    241N  SER*     4.0    18.6    -      -       -      +
    244N  LEU*     4.0    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 258 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254M  PHE*     3.3    45.3    -      -       +      +
    255M  ALA*     2.7    14.9    +      -       -      +
    257M  ALA*     1.3    71.5    -      -       -      +
    259M  VAL*     1.3    64.1    +      -       +      +
    261M  LEU*     3.1    27.4    -      -       +      +
    262M  VAL*     3.2    18.7    +      -       +      +
    241N  SER*     4.1    11.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 259 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46M  ILE*     4.7     9.9    -      -       +      -
     47M  TRP*     5.1     9.0    -      -       +      -
     50M  VAL*     3.9    36.1    -      -       +      -
    103M  LEU*     4.1    22.2    -      -       +      -
    255M  ALA*     2.9    20.8    +      -       -      +
    256M  LEU*     3.5    11.0    -      -       +      +
    258M  VAL*     1.3    77.6    -      -       +      +
    260M  LEU*     1.3    55.5    +      -       +      +
    262M  VAL*     3.0    11.5    +      -       -      +
    263M  PHE*     2.7    30.8    +      -       -      +
    504M  LOP      5.1    10.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 260 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53M  PHE*     3.3    54.7    -      -       +      -
    103M  LEU*     4.9     4.7    -      -       +      -
    256M  LEU*     3.0    26.5    +      -       +      +
    257M  ALA*     3.5     5.6    -      -       -      +
    259M  VAL*     1.3    79.0    -      -       +      +
    261M  LEU*     1.3    59.1    +      -       -      +
    263M  PHE*     3.7    21.3    -      -       +      -
    264M  PHE*     2.7    54.0    +      -       +      -
    237N  LEU*     4.2    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 261 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257M  ALA      2.8    16.7    +      -       -      +
    258M  VAL*     3.1    19.3    -      -       +      +
    259M  VAL      3.1     0.2    -      -       -      -
    260M  LEU*     1.3    72.9    -      -       -      +
    262M  VAL*     1.3    62.6    +      -       +      +
    264M  PHE*     3.9     2.4    -      -       -      +
    265M  ALA*     3.0    27.2    +      -       -      +
    431M  BGL      4.6    17.7    -      -       +      -
    234N  VAL*     3.5    42.4    -      -       +      +
    237N  LEU*     4.1    15.0    -      -       +      +
    238N  THR*     3.7    21.1    -      -       +      +
    241N  SER*     4.1    16.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 262 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258M  VAL*     3.3    21.1    -      -       +      +
    259M  VAL*     3.0     7.1    +      -       -      +
    261M  LEU*     1.3    77.6    -      -       +      +
    263M  PHE*     1.3    69.4    +      -       -      +
    265M  ALA*     3.0    22.9    -      -       +      +
    266M  ILE*     3.0    24.3    +      -       +      +
    431M  BGL      5.8     4.9    -      -       +      -
    504M  LOP      4.4    24.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 263 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53M  PHE*     5.2     0.7    -      +       -      -
     57M  LEU*     3.8    20.0    -      -       +      -
     96M  LEU*     3.4    47.8    -      -       +      -
     99M  ASN*     3.6    26.7    -      -       +      -
    100M  GLY*     4.1     3.8    -      -       -      -
    103M  LEU*     4.1    15.5    -      -       +      -
    259M  VAL      2.7    18.4    +      -       -      +
    260M  LEU*     3.4    27.6    -      -       +      +
    262M  VAL*     1.3    72.4    -      -       -      +
    264M  PHE*     1.3    74.6    +      +       -      +
    266M  ILE*     2.9    15.7    +      -       +      +
    267M  VAL*     2.9    28.6    +      -       +      +
    504M  LOP      4.0    28.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 264 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53M  PHE*     5.6     3.8    -      +       -      -
     57M  LEU*     6.5     0.2    -      -       +      -
     92M  MET*     5.5     9.0    -      -       -      -
     96M  LEU*     4.2    32.8    -      -       +      -
    260M  LEU*     2.7    50.4    +      -       +      +
    261M  LEU      3.9     2.7    -      -       -      +
    263M  PHE*     1.3    79.1    -      +       -      +
    265M  ALA*     1.3    57.4    +      -       -      +
    267M  VAL*     3.7     8.5    -      -       +      +
    268M  GLY*     2.5    36.7    +      -       -      -
    230N  GLY*     5.4     2.4    -      -       -      -
    233N  ALA*     3.8    31.6    -      -       +      -
    234N  VAL*     5.3     2.7    -      -       +      +
    237N  LEU*     3.7    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 265 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261M  LEU*     3.0    15.6    +      -       +      +
    262M  VAL*     3.0    20.4    -      -       +      +
    264M  PHE*     1.3    75.8    -      -       -      +
    266M  ILE*     1.3    51.7    +      -       +      +
    269M  PHE*     2.7    51.3    +      -       +      +
    270M  MET*     4.7     0.6    -      -       -      +
    431M  BGL      4.1    32.7    -      -       +      +
    234N  VAL*     4.6     9.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 266 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99M  ASN*     4.1    17.0    -      -       -      +
    262M  VAL*     3.1    27.4    -      -       +      +
    263M  PHE*     2.9     9.4    +      -       +      +
    265M  ALA*     1.3    72.5    -      -       +      +
    267M  VAL*     1.3    62.3    +      -       +      +
    268M  GLY      3.0     1.6    -      -       -      -
    270M  MET*     2.6    80.4    +      -       +      +
    271M  PRO      2.9     0.9    -      -       -      -
    273M  TYR*     5.4     0.9    -      -       +      -
    274M  LEU*     5.1    13.0    -      -       +      -
    504M  LOP      4.5    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 267 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92M  MET*     4.4    13.1    -      -       -      +
     95M  TYR*     3.9    25.4    -      -       +      +
     96M  LEU*     4.0    26.2    -      -       +      +
     99M  ASN*     4.3     7.4    -      -       +      +
    263M  PHE*     2.9    52.7    -      -       +      +
    264M  PHE*     3.7    10.3    -      -       +      +
    266M  ILE*     1.3    74.9    -      -       +      +
    268M  GLY*     1.3    62.7    +      -       -      +
    271M  PRO*     3.8    18.7    -      -       -      +
    226N  ARG*     4.1    10.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 268 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92M  MET*     5.3     3.8    -      -       -      -
    264M  PHE      2.5    21.8    +      -       -      -
    265M  ALA      3.8     0.4    -      -       -      -
    267M  VAL*     1.3    75.2    -      -       -      +
    269M  PHE*     1.3    65.2    +      -       -      +
    226N  ARG*     3.1    44.4    +      -       -      +
    227N  LYS*     4.4     4.0    -      -       -      +
    230N  GLY*     4.5    12.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 269 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265M  ALA*     2.7    34.1    +      -       -      +
    268M  GLY*     1.3    76.4    -      -       -      +
    270M  MET*     1.3    59.3    +      -       +      +
    271M  PRO*     3.6     4.9    -      -       -      +
    431M  BGL      3.3    75.5    +      -       +      +
     16N  PRO*     3.5    33.9    -      -       +      -
    226N  ARG*     4.1     7.8    +      -       -      +
    227N  LYS*     4.0    20.6    -      -       +      -
    230N  GLY*     4.2     5.4    -      -       -      -
    231N  PHE*     3.8    34.5    -      +       -      -
    234N  VAL*     4.1    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 270 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99M  ASN*     4.7     0.2    -      -       -      +
    265M  ALA      4.7     0.4    -      -       -      +
    266M  ILE*     2.6    55.1    +      -       +      +
    269M  PHE*     1.3    79.4    -      -       +      +
    271M  PRO*     1.3    65.4    -      -       -      +
    272M  ASN      3.3     1.8    -      -       -      -
    273M  TYR*     3.3    44.7    +      -       +      +
    431M  BGL      4.6    32.1    -      -       +      +
    121N  LEU*     3.6    37.5    -      -       +      +
----------------------------------------------------------
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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