Contacts of the helix formed by residues 264 - 293 (chain F) in PDB entry 6PB4


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 LYS 264 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161F  LEU*     5.5    11.4    -      -       +      -
    263F  PRO*     1.3    75.3    -      -       +      +
    265F  GLN*     1.3    65.0    +      -       -      +
    266F  PHE      3.1     0.9    -      -       -      -
    267F  ASP*     2.9    34.0    +      -       -      +
    268F  TYR*     3.1    31.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 265 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143F  TYR      4.5     1.2    +      -       -      -
    147F  GLN*     3.4    18.1    -      -       -      +
    150F  ARG*     3.2    28.6    +      -       -      +
    161F  LEU*     4.3     7.6    -      -       +      +
    165F  PHE*     3.4    33.4    -      -       +      -
    263F  PRO      2.5     8.3    +      -       -      +
    264F  LYS*     1.3    74.1    -      -       -      +
    266F  PHE*     1.3    79.2    +      -       +      +
    268F  TYR*     3.3    24.3    -      -       +      +
    269F  LEU*     3.0    43.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 266 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134F  VAL*     5.1     8.7    -      -       +      -
    143F  TYR      5.3     0.9    -      -       -      -
    144F  LEU*     4.2    20.6    -      -       +      -
    165F  PHE*     4.7     3.1    -      +       -      -
    256F  PHE*     3.9    29.6    -      +       -      -
    259F  PHE*     5.8     3.4    -      -       +      -
    260F  ARG      4.6     7.6    -      -       -      -
    261F  LEU*     5.1     6.7    -      -       +      -
    262F  VAL*     3.2    50.0    -      -       +      +
    263F  PRO      3.4     1.5    +      -       -      -
    264F  LYS      2.9     1.2    +      -       -      -
    265F  GLN*     1.3    93.1    -      -       +      +
    267F  ASP*     1.3    57.2    +      -       -      +
    268F  TYR      3.2     0.4    -      -       -      -
    269F  LEU*     2.9    24.2    +      -       +      +
    270F  VAL*     2.6    42.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 267 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263F  PRO*     5.5     1.5    -      -       -      +
    264F  LYS*     2.9    26.0    +      -       -      +
    266F  PHE*     1.3    76.7    -      -       -      +
    268F  TYR*     1.3    52.5    +      -       +      +
    270F  VAL*     2.9     9.7    +      -       -      +
    271F  ASN*     2.4    50.6    +      -       -      +
    274F  ARG*     5.1     4.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 268 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264F  LYS*     3.1    49.2    +      -       +      +
    265F  GLN*     3.3    17.5    -      -       +      +
    267F  ASP*     1.3    77.5    -      -       +      +
    269F  LEU*     1.3    54.5    +      -       +      +
    271F  ASN*     2.9    14.4    +      -       +      +
    272F  SER*     2.6    42.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 269 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134F  VAL*     5.7     6.5    -      -       +      -
    143F  TYR*     3.5    42.1    -      -       +      +
    147F  GLN*     3.6    22.0    -      -       -      +
    265F  GLN*     3.0    45.3    -      -       -      +
    266F  PHE*     2.9    31.9    +      -       +      +
    268F  TYR*     1.3    79.4    -      -       +      +
    270F  VAL*     1.3    58.8    +      -       +      +
    272F  SER*     3.3    20.8    -      -       -      +
    273F  MET*     3.3    19.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 270 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130F  VAL*     5.1     9.6    -      -       +      -
    134F  VAL*     4.7    11.2    -      -       +      -
    266F  PHE*     2.6    24.0    +      -       +      +
    267F  ASP*     3.4    10.8    -      -       -      +
    269F  LEU*     1.3    70.6    -      -       +      +
    271F  ASN*     1.3    55.8    +      -       -      +
    272F  SER      3.1     1.3    -      -       -      -
    273F  MET*     2.9    20.7    +      -       +      +
    274F  ARG*     2.5    60.7    +      -       +      +
    365F  MET*     4.7    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 271 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267F  ASP*     2.4    44.2    +      -       -      +
    268F  TYR*     3.3    16.5    -      -       +      +
    270F  VAL*     1.3    70.8    -      -       -      +
    272F  SER*     1.3    56.4    +      -       -      +
    274F  ARG*     2.5    41.5    +      -       -      +
    275F  VAL*     2.8    45.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 272 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143F  TYR*     4.1    21.7    -      -       -      -
    268F  TYR*     2.6    25.9    +      -       -      +
    269F  LEU*     3.3    20.7    -      -       -      +
    271F  ASN*     1.3    74.1    -      -       -      +
    273F  MET*     1.3    59.0    +      -       -      +
    275F  VAL*     4.7     1.6    -      -       -      +
    276F  MET*     3.2    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 273 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130F  VAL*     6.3     0.2    -      -       +      -
    133F  SER*     4.4     6.3    -      -       -      +
    134F  VAL*     3.9    34.1    -      -       +      +
    137F  TYR*     3.3    52.2    +      -       +      +
    140F  ALA*     5.4    11.2    -      -       +      +
    143F  TYR*     5.7     2.2    -      -       +      -
    269F  LEU*     3.3    23.3    -      -       +      +
    270F  VAL*     2.9    22.0    +      -       +      +
    272F  SER*     1.3    78.3    -      -       -      +
    274F  ARG*     1.3    64.2    +      -       -      +
    275F  VAL      3.4     0.4    -      -       -      -
    276F  MET*     4.2     4.3    -      -       -      +
    277F  MET*     3.7    17.8    +      -       -      +
    362F  ASN*     4.6     6.1    +      -       -      -
    365F  MET*     5.5    14.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 274 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267F  ASP*     5.1     4.4    +      -       -      +
    270F  VAL*     2.5    41.9    +      -       +      +
    271F  ASN*     2.5    38.2    +      -       -      +
    273F  MET*     1.3    72.1    -      -       -      +
    275F  VAL*     1.3    67.7    +      -       +      +
    277F  MET*     3.4    29.8    -      -       +      +
    278F  ASP*     3.5    17.0    +      -       -      +
    365F  MET*     5.5     9.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 275 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271F  ASN*     2.8    26.8    +      -       +      +
    272F  SER*     4.7     2.9    -      -       -      +
    274F  ARG*     1.3    80.3    -      -       +      +
    276F  MET*     1.3    66.8    +      -       +      +
    278F  ASP*     2.9    28.3    +      -       +      +
    279F  ARG*     3.2    20.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 276 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272F  SER      3.2    21.4    +      -       -      +
    273F  MET*     4.5     4.5    -      -       -      +
    274F  ARG      3.4     0.4    -      -       -      -
    275F  VAL*     1.3    79.1    -      -       +      +
    277F  MET*     1.3    67.5    +      -       -      +
    279F  ARG*     2.9    57.1    +      -       -      +
    280F  VAL*     3.2    17.1    +      -       +      +
    347F  ILE*     3.7    10.3    -      -       +      -
    350F  GLU*     3.4    24.7    -      -       +      +
    351F  THR*     3.5    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 277 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273F  MET      3.7     7.8    +      -       -      +
    274F  ARG*     3.4    24.8    +      -       +      +
    275F  VAL      3.2     0.2    -      -       -      -
    276F  MET*     1.3    77.2    -      -       -      +
    278F  ASP*     1.3    74.1    +      -       -      +
    279F  ARG      2.9     6.8    +      -       -      -
    280F  VAL*     3.0     7.2    +      -       -      +
    281F  ARG*     2.9    34.0    +      -       +      +
    358F  VAL*     5.7     4.0    -      -       -      -
    362F  ASN*     3.4    48.0    -      -       -      +
    363F  ARG*     6.0     0.7    -      -       -      -
    365F  MET*     5.5     7.2    -      -       +      -
    366F  SER*     5.1     8.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 278 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274F  ARG*     3.5    19.8    -      -       -      +
    275F  VAL*     2.9    14.5    +      -       +      +
    277F  MET*     1.3    89.4    -      -       -      +
    279F  ARG*     1.3    51.9    +      -       -      +
    281F  ARG*     4.2    25.0    +      -       -      +
    282F  THR*     2.5    28.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 279 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275F  VAL*     3.5    17.7    -      -       +      +
    276F  MET*     2.9    52.0    +      -       +      +
    277F  MET      2.9     0.2    +      -       -      -
    278F  ASP*     1.3    79.4    -      -       -      +
    280F  VAL*     1.3    61.7    +      -       +      +
    281F  ARG      3.3     0.9    -      -       -      -
    282F  THR*     2.9     9.8    +      -       -      -
    283F  GLN*     2.8    31.8    +      -       -      +
    343F  LYS*     3.7    25.3    -      -       -      +
    347F  ILE*     4.2    16.7    -      -       +      +
    350F  GLU*     3.6    20.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 280 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    276F  MET*     3.2    11.2    +      -       +      +
    277F  MET*     3.0     6.7    +      -       -      +
    279F  ARG*     1.3    78.1    -      -       +      +
    281F  ARG*     1.3    62.6    +      -       -      +
    283F  GLN*     2.9    21.0    +      -       +      -
    284F  GLU*     2.9    38.9    +      -       +      +
    347F  ILE*     5.0    16.8    -      -       +      -
    351F  THR*     6.5     0.4    -      -       +      -
    355F  ILE*     5.8     7.2    -      -       +      -
    358F  VAL*     5.1    18.4    -      -       +      -
    359F  LYS*     5.6     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 281 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277F  MET*     2.9    25.7    +      -       +      +
    278F  ASP*     4.2    22.5    +      -       -      +
    280F  VAL*     1.3    76.6    -      -       -      +
    282F  THR*     1.3    62.4    +      -       -      +
    284F  GLU*     4.5     9.4    -      -       -      +
    285F  ARG*     3.2    22.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 282 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278F  ASP      2.5    26.0    +      -       -      -
    279F  ARG*     2.9    15.0    +      -       -      -
    281F  ARG*     1.3    75.9    -      -       -      +
    283F  GLN*     1.3    70.3    +      -       -      +
    285F  ARG*     3.0     6.1    +      -       -      +
    286F  LEU*     2.9    24.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 283 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279F  ARG*     2.8    23.1    +      -       -      +
    280F  VAL*     2.9    15.5    +      -       +      +
    282F  THR*     1.3    79.7    -      -       -      +
    284F  GLU*     1.3    65.5    +      -       +      +
    286F  LEU*     3.0    11.5    +      -       -      +
    287F  ILE*     3.0    38.9    +      -       +      +
    340F  ALA      4.8     4.2    -      -       -      +
    343F  LYS*     3.8    31.8    -      -       -      +
    344F  LEU*     4.6    15.4    +      -       +      +
    347F  ILE*     3.4    31.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 284 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280F  VAL*     2.9    34.4    +      -       +      +
    281F  ARG*     4.5     7.5    -      -       -      +
    283F  GLN*     1.3    75.9    -      -       +      +
    285F  ARG*     1.3    59.8    +      -       -      +
    287F  ILE*     3.0    12.6    +      -       +      +
    288F  MET*     2.9    39.8    +      -       +      +
    306F  PHE*     5.6     7.0    -      -       +      -
    307F  THR*     5.3     2.6    -      -       -      +
    310F  GLU*     5.3     5.9    -      -       -      +
    355F  ILE*     5.7     0.3    -      -       -      +
    359F  LYS*     3.4    32.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 285 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281F  ARG*     3.2    20.2    +      -       +      +
    282F  THR*     3.0     5.4    +      -       -      +
    284F  GLU*     1.3    78.5    -      -       -      +
    286F  LEU*     1.3    64.3    +      -       -      +
    288F  MET*     3.2    42.2    -      -       -      +
    289F  LYS*     3.0    46.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 286 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282F  THR*     2.9    15.0    +      -       +      +
    283F  GLN*     3.3    15.9    -      -       -      +
    285F  ARG*     1.3    75.7    -      -       -      +
    287F  ILE*     1.3    68.1    +      -       +      +
    289F  LYS*     3.0    24.0    +      -       +      +
    290F  LEU*     3.2    36.9    +      -       +      +
    340F  ALA*     5.7     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 287 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283F  GLN*     3.1    36.8    -      -       +      +
    284F  GLU*     3.0    11.1    +      -       +      +
    286F  LEU*     1.3    80.7    -      -       +      +
    288F  MET*     1.3    63.5    +      -       -      +
    290F  LEU*     3.0    11.9    +      -       -      +
    291F  CYS*     2.8    38.1    +      -       -      -
    302F  PHE*     4.2     6.1    -      -       +      -
    306F  PHE*     3.8    41.5    -      -       +      -
    340F  ALA*     4.9    22.4    -      -       +      +
    341F  LEU*     6.5     0.2    -      -       -      -
    344F  LEU*     4.8    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 288 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284F  GLU*     2.9    23.2    +      -       +      +
    285F  ARG*     3.2    35.0    -      -       -      +
    287F  ILE*     1.3    74.5    -      -       -      +
    289F  LYS*     1.3    58.4    +      -       -      +
    291F  CYS      3.0     0.5    +      -       -      -
    292F  VAL*     2.6    60.4    +      -       +      +
    299F  LYS*     3.6    26.7    -      -       -      +
    302F  PHE*     4.4    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 289 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285F  ARG*     3.0    45.6    +      -       -      +
    286F  LEU*     3.0    15.7    +      -       +      +
    288F  MET*     1.3    78.4    -      -       -      +
    290F  LEU*     1.3    68.5    +      -       +      +
    292F  VAL*     5.3     0.4    -      -       -      -
    293F  GLU*     3.3    36.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 290 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286F  LEU*     3.6    39.5    -      -       +      +
    287F  ILE*     3.0    13.0    +      -       +      +
    289F  LYS*     1.3    86.9    -      -       +      +
    291F  CYS*     1.3    66.6    +      -       -      +
    293F  GLU*     4.4     1.9    +      -       -      +
    294F  GLN*     4.4    12.0    -      -       -      +
    333F  VAL*     5.6     5.4    -      -       -      +
    336F  GLU*     5.7    10.5    -      -       +      +
    339F  ARG*     6.2     1.3    -      -       -      +
    340F  ALA*     4.9    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 291 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287F  ILE*     2.8    28.7    +      -       -      +
    290F  LEU*     1.3    84.5    -      -       -      +
    292F  VAL*     1.3    64.5    +      -       -      +
    293F  GLU      3.4     0.5    +      -       -      -
    294F  GLN*     3.4     7.3    +      -       -      +
    295F  CYS*     3.4    28.6    +      -       -      -
    302F  PHE*     3.4    36.1    -      -       +      -
    306F  PHE*     6.0     1.1    -      -       -      -
    315F  TRP*     6.2     2.5    -      -       -      -
    333F  VAL*     6.3     1.3    -      -       -      -
    337F  VAL*     4.7    23.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 292 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288F  MET*     2.6    49.0    +      -       +      +
    289F  LYS*     5.3     0.2    -      -       -      -
    291F  CYS*     1.3    72.4    -      -       -      +
    293F  GLU*     1.3    68.4    +      -       +      +
    294F  GLN*     3.0     2.8    +      -       -      -
    295F  CYS*     4.2     4.4    +      -       -      +
    297F  MET      4.9     0.3    -      -       -      +
    298F  PRO*     3.5    27.3    -      -       -      +
    299F  LYS*     3.8    23.1    -      -       +      +
    302F  PHE*     3.8    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 293 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289F  LYS*     3.3    35.3    +      -       +      +
    290F  LEU      5.0     2.0    -      -       -      +
    291F  CYS      3.3     1.2    -      -       -      -
    292F  VAL*     1.3    81.1    -      -       +      +
    294F  GLN*     1.3    60.1    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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