Contacts of the helix formed by residues 293 - 318 (chain F) in PDB entry 2GPV


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 SER 293 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291F  THR      3.9     0.6    +      -       -      -
    292F  LEU*     1.3    77.2    -      -       -      +
    294F  LEU*     1.3    65.8    +      -       -      +
    295F  ALA      4.2     2.0    -      -       -      -
    296F  ASP*     3.2    26.9    +      -       -      +
    297F  GLN*     2.9    20.3    +      -       -      +
    383F  GLU*     3.3    25.8    +      -       -      +
    384F  ASP*     5.4     3.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 294 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292F  LEU      3.8     0.8    +      -       -      -
    293F  SER*     1.3    71.3    -      -       -      +
    295F  ALA*     1.3    55.7    +      -       -      +
    297F  GLN*     2.9    24.4    +      -       +      +
    298F  MET*     2.8    50.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 295 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293F  SER*     3.3     1.2    +      -       -      -
    294F  LEU*     1.3    79.5    -      -       -      +
    296F  ASP*     1.3    58.1    +      -       -      +
    298F  MET*     3.8    14.3    +      -       -      +
    299F  SER*     2.9    29.7    +      -       -      -
    381F  HIS      5.7     1.3    -      -       -      +
    383F  GLU*     3.4    37.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 296 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292F  LEU*     4.5     9.5    -      -       +      +
    293F  SER*     3.2    22.6    +      -       -      +
    294F  LEU      3.1     0.6    -      -       -      -
    295F  ALA*     1.3    77.9    -      -       -      +
    297F  GLN*     1.3    65.7    +      -       -      +
    298F  MET      3.2     1.6    -      -       -      -
    299F  SER*     3.1     4.1    +      -       -      -
    300F  LEU*     3.0    31.0    +      -       -      +
    381F  HIS      4.0     2.4    -      -       -      +
    382F  ILE*     3.4    19.6    -      -       +      +
    383F  GLU*     2.7    27.2    +      -       -      +
    384F  ASP*     2.8    34.7    +      -       -      +
    388F  VAL*     4.3     9.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 297 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284F  LYS*     5.4     5.7    -      -       -      +
    289F  PHE*     3.4    53.1    +      -       +      +
    290F  SER*     3.3    19.5    +      -       -      +
    292F  LEU*     2.6    28.9    +      -       +      +
    293F  SER      2.9    17.3    +      -       -      +
    294F  LEU*     3.5    24.0    -      -       +      +
    296F  ASP*     1.3    76.9    -      -       -      +
    298F  MET*     1.3    64.0    +      -       +      +
    300F  LEU*     3.9     1.3    -      -       -      +
    301F  LEU*     3.2    31.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 298 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294F  LEU*     2.8    33.2    +      -       +      +
    295F  ALA*     3.9    12.3    -      -       -      +
    297F  GLN*     1.3    77.4    -      -       +      +
    299F  SER*     1.3    54.7    +      -       -      +
    301F  LEU*     3.4     6.9    +      -       +      +
    302F  GLN*     2.6    39.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 299 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295F  ALA      2.9    23.6    +      -       -      -
    296F  ASP*     3.1     6.2    +      -       -      -
    298F  MET*     1.3    75.7    -      -       -      +
    300F  LEU*     1.3    63.0    +      -       -      +
    302F  GLN*     3.3    10.5    +      -       -      +
    303F  SER*     2.9    27.2    +      -       -      -
    379F  SER*     3.6    25.2    +      -       -      -
    381F  HIS*     3.6    18.0    +      -       -      +
    382F  ILE*     4.0    10.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 300 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289F  PHE*     4.0    22.0    -      -       +      -
    292F  LEU*     4.1    19.1    -      -       +      -
    296F  ASP      3.0    18.9    +      -       -      +
    297F  GLN      3.9     3.4    -      -       -      +
    299F  SER*     1.3    74.8    -      -       -      +
    301F  LEU*     1.3    53.1    +      -       -      +
    303F  SER*     3.1     2.1    +      -       -      -
    304F  ALA*     2.7    37.8    +      -       -      +
    374F  LEU*     3.7    27.4    -      -       +      +
    375F  ALA*     4.2    14.6    -      -       -      +
    377F  SER*     3.3    17.3    +      -       -      +
    378F  ASP      5.5     2.5    -      -       -      +
    379F  SER*     5.2     2.7    -      -       -      +
    382F  ILE*     3.9    23.3    -      -       +      -
    388F  VAL*     4.2    11.4    -      -       +      -
    391F  LEU*     4.5    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 301 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279F  ILE*     4.6    19.3    -      -       +      +
    280F  ILE*     4.0    32.5    -      -       +      -
    283F  ALA*     4.2    15.7    -      -       +      -
    289F  PHE*     4.1    15.7    -      -       +      -
    297F  GLN*     3.2    19.7    +      -       +      +
    298F  MET*     3.8     6.1    -      -       +      +
    300F  LEU*     1.3    76.6    -      -       -      +
    302F  GLN*     1.3    65.2    +      -       -      +
    304F  ALA      4.3     0.2    -      -       -      +
    305F  TRP*     3.0    36.6    +      -       +      +
    308F  ILE*     5.0     3.4    -      -       +      -
    374F  LEU*     3.7    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 302 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298F  MET      2.6    23.9    +      -       -      +
    299F  SER*     3.5    10.9    -      -       -      +
    301F  LEU*     1.3    71.3    -      -       -      +
    303F  SER*     1.3    65.0    +      -       -      +
    305F  TRP*     3.2    23.4    +      -       -      -
    379F  SER*     4.9     4.3    +      -       -      -
    381F  HIS*     5.8     4.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 303 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299F  SER      2.9    17.3    +      -       -      -
    300F  LEU      3.5     3.1    -      -       -      -
    302F  GLN*     1.3    85.2    +      -       -      +
    304F  ALA*     1.3    60.3    +      -       -      +
    305F  TRP*     3.5     2.3    +      -       -      -
    306F  MET*     4.9     1.7    +      -       -      +
    307F  GLU*     4.5     7.1    -      -       -      +
    377F  SER*     3.5    27.5    +      -       -      -
    379F  SER*     3.6    21.2    -      -       -      -
    428F  SER*     5.2     4.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 304 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300F  LEU      2.7    20.7    +      -       -      +
    303F  SER*     1.3    72.2    -      -       -      +
    305F  TRP*     1.3    66.5    +      -       -      +
    306F  MET      3.1     3.9    +      -       -      -
    307F  GLU*     3.1    22.1    +      -       +      +
    308F  ILE*     3.2    15.7    +      -       +      +
    373F  ALA      3.8     4.7    -      -       -      +
    374F  LEU*     3.7    27.6    -      -       +      -
    377F  SER*     3.5    19.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 305 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    276F  LEU*     3.8    29.1    -      -       +      +
    279F  ILE*     5.0     2.9    -      -       +      +
    301F  LEU*     3.0    24.1    +      -       +      +
    302F  GLN*     3.2    30.0    +      -       -      -
    303F  SER      4.6     2.6    +      -       -      -
    304F  ALA*     1.3    77.0    -      -       -      +
    306F  MET*     1.3    97.5    +      -       +      +
    308F  ILE*     3.2    10.9    +      -       -      +
    309F  LEU*     3.1    49.8    +      -       +      +
    432F  VAL*     4.4    15.4    -      -       +      +
    435F  PHE*     5.5     5.2    -      +       -      -
    436F  TYR*     4.2    18.9    +      +       -      -
    505F  OHT      3.8    37.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with MET 306 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303F  SER      4.9     1.7    +      -       -      +
    304F  ALA      3.2     0.8    -      -       -      -
    305F  TRP*     1.3   102.1    -      -       +      +
    307F  GLU*     1.3    57.5    +      -       -      +
    309F  LEU*     3.2     9.6    +      -       -      +
    310F  ILE*     2.9    45.0    +      -       +      +
    428F  SER*     3.5    27.4    -      -       -      +
    431F  ALA*     3.8    23.6    -      -       +      +
    432F  VAL*     3.6    25.8    -      -       +      +
    435F  PHE*     5.1     2.0    -      -       +      -
    505F  OHT      3.6    46.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 307 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303F  SER      4.5     9.3    -      -       -      +
    304F  ALA*     3.1    15.9    +      -       -      +
    306F  MET*     1.3    76.6    -      -       -      +
    308F  ILE*     1.3    56.5    +      -       -      +
    310F  ILE*     3.9     1.1    -      -       -      -
    311F  LEU*     3.0    30.8    +      -       -      +
    373F  ALA*     4.2    25.0    -      -       +      +
    377F  SER*     5.0     3.1    -      -       -      +
    421F  LEU*     5.1     3.1    -      -       -      +
    424F  LEU*     3.7    31.8    -      -       +      +
    425F  ARG*     2.8    46.1    +      -       -      +
    428F  SER*     3.2    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 308 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279F  ILE*     3.8    37.8    -      -       +      +
    282F  TRP*     4.0    19.7    -      -       +      -
    301F  LEU*     5.0     1.6    -      -       +      -
    304F  ALA*     3.2    19.8    +      -       +      +
    305F  TRP*     3.6     8.5    -      -       -      +
    306F  MET      3.2     0.6    -      -       -      -
    307F  GLU*     1.3    74.6    -      -       -      +
    309F  LEU*     1.3    66.3    +      -       -      +
    311F  LEU*     4.3     4.5    -      -       -      +
    312F  GLY*     3.2    17.5    +      -       -      -
    370F  LYS*     4.1    35.8    -      -       +      +
    373F  ALA*     4.9     7.2    -      -       +      -
    374F  LEU*     3.9    33.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 309 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272F  ALA*     4.0    12.6    -      -       +      +
    275F  GLU*     3.6    44.1    -      -       +      +
    276F  LEU*     4.5     5.4    -      -       +      -
    279F  ILE*     3.9    12.6    -      -       +      -
    305F  TRP*     3.1    47.9    +      -       +      +
    306F  MET*     3.2     9.2    +      -       -      +
    308F  ILE*     1.3    77.7    -      -       -      +
    310F  ILE*     1.3    57.0    +      -       -      +
    312F  GLY*     3.1     4.3    +      -       -      -
    313F  VAL      3.1    22.0    +      -       -      -
    505F  OHT      3.5    47.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 310 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306F  MET*     2.9    32.4    +      -       +      +
    307F  GLU*     4.1     3.4    -      -       -      +
    308F  ILE      3.3     0.2    -      -       -      -
    309F  LEU*     1.3    72.9    -      -       -      +
    311F  LEU*     1.3    60.2    +      -       -      +
    312F  GLY      3.1     1.6    -      -       -      -
    313F  VAL*     2.9    12.0    -      -       +      +
    314F  VAL*     2.9    31.4    +      -       +      +
    349F  ILE*     4.4    22.0    -      -       +      -
    352F  LEU*     4.3    16.4    -      -       +      -
    424F  LEU*     3.9    17.0    -      -       +      -
    427F  THR*     4.2     9.0    -      -       +      +
    428F  SER*     3.7    31.9    -      -       -      +
    431F  ALA*     4.0    14.4    -      -       +      -
    505F  OHT      4.6     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 311 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307F  GLU      3.0    18.1    +      -       -      +
    308F  ILE*     4.3     4.0    -      -       -      +
    310F  ILE*     1.3    76.1    -      -       -      +
    312F  GLY*     1.3    56.7    +      -       -      +
    314F  VAL*     3.7     7.1    -      -       +      +
    315F  TYR*     2.9    25.7    +      -       -      +
    356F  TYR*     3.7    38.6    -      -       +      +
    361F  LEU*     5.6     2.9    -      -       +      -
    366F  PHE*     3.4    28.7    -      -       +      +
    369F  LEU*     4.1    10.8    -      -       +      -
    370F  LYS*     3.6    39.7    -      -       +      +
    373F  ALA*     5.3     0.9    -      -       +      -
    424F  LEU*     4.0    24.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 312 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275F  GLU*     5.6     1.1    -      -       -      -
    308F  ILE      3.2    12.7    +      -       -      -
    309F  LEU*     3.1     8.8    +      -       -      -
    310F  ILE      3.1     1.0    -      -       -      -
    311F  LEU*     1.3    79.7    -      -       -      +
    313F  VAL*     1.3    61.5    +      -       -      +
    315F  TYR*     3.4     2.6    +      -       -      +
    316F  ARG*     2.9    39.5    +      -       -      +
    366F  PHE*     4.0    15.2    -      -       -      -
    370F  LYS*     5.3     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 313 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309F  LEU      3.1     4.9    +      -       -      +
    310F  ILE*     2.9    34.3    -      -       +      +
    312F  GLY*     1.3    71.3    -      -       -      +
    314F  VAL*     1.3    60.6    +      -       -      +
    316F  ARG*     3.4    20.8    +      -       -      +
    317F  SER*     2.7    37.1    +      -       -      +
    324F  LEU*     4.3     7.0    -      -       +      -
    325F  VAL      3.4    27.8    -      -       -      +
    326F  TYR*     3.7    34.5    -      -       +      +
    349F  ILE*     4.3    15.3    -      -       +      -
    505F  OHT      4.1     4.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 314 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310F  ILE*     2.9    27.8    +      -       +      +
    311F  LEU*     3.7     9.6    -      -       +      +
    313F  VAL*     1.3    72.9    -      -       -      +
    315F  TYR*     1.3    67.8    +      -       -      +
    317F  SER*     2.8    14.7    +      -       -      -
    318F  LEU*     3.3    13.1    +      -       +      +
    349F  ILE*     3.7    33.4    -      -       +      +
    352F  LEU*     3.9    11.0    -      -       +      -
    353F  VAL*     3.9    25.8    -      -       +      +
    356F  TYR*     3.6    33.0    -      -       +      -
    361F  LEU*     6.0     0.2    -      -       +      -
    424F  LEU*     5.8     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 315 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    311F  LEU*     2.9    11.6    +      -       +      +
    312F  GLY      3.8     1.3    -      -       -      +
    314F  VAL*     1.3    74.7    -      -       -      +
    316F  ARG*     1.3    69.8    +      -       +      +
    317F  SER      3.2     0.7    +      -       -      -
    318F  LEU*     3.5    43.9    +      -       +      +
    361F  LEU*     3.9    11.9    +      -       +      -
    362F  GLU*     4.0     5.6    -      -       -      -
    363F  LYS*     3.3    57.2    +      -       +      +
    366F  PHE*     3.5    62.6    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 316 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    248F  LYS*     6.5     0.7    -      -       -      -
    275F  GLU*     3.7    14.1    +      -       -      -
    312F  GLY*     2.9    31.6    +      -       -      +
    313F  VAL*     3.4    23.6    -      -       -      +
    314F  VAL      3.2     0.8    -      -       -      -
    315F  TYR*     1.3    82.5    -      -       +      +
    317F  SER*     1.3    58.1    +      -       -      +
    318F  LEU      3.6     0.4    +      -       -      -
    319F  SER*     5.0     2.5    +      -       -      -
    320F  PHE*     3.9     9.7    -      -       -      -
    325F  VAL*     3.1    43.0    +      -       +      +
    326F  TYR      3.1    25.0    +      -       -      -
    327F  ALA*     4.6     3.7    -      -       -      +
    328F  ASP*     5.8     2.7    -      -       -      +
    366F  PHE*     5.8     1.0    -      -       +      -
    505F  OHT      3.6    15.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 317 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313F  VAL      2.7    22.4    +      -       -      -
    314F  VAL      2.8     6.9    +      -       -      -
    316F  ARG*     1.3    76.9    -      -       -      +
    318F  LEU*     1.3    62.7    +      -       -      +
    319F  SER      3.4     2.7    -      -       -      -
    320F  PHE*     3.0    22.8    +      -       -      +
    323F  GLU      3.6    18.0    -      -       -      +
    324F  LEU*     3.4     4.9    -      -       -      +
    325F  VAL*     2.7    29.4    +      -       -      -
    353F  VAL*     3.7    23.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 318 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314F  VAL*     3.3    12.2    +      -       +      +
    315F  TYR*     3.5    46.9    +      -       +      +
    316F  ARG      3.6     0.2    -      -       -      -
    317F  SER*     1.3    75.9    -      -       -      +
    319F  SER*     1.3    58.6    +      -       -      +
    320F  PHE      3.2     4.2    +      -       -      +
    353F  VAL*     3.9    21.3    -      -       +      +
    356F  TYR*     3.7    27.6    -      -       +      +
    357F  LYS*     3.2    37.7    -      -       +      +
    361F  LEU*     4.0    25.6    -      -       +      +
----------------------------------------------------------
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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