Contacts of the helix formed by residues 371 - 395 (chain F) in PDB entry 5KRA


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 THR 371 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    369F  ASP      5.6     0.7    -      -       -      +
    370F  LEU*     1.3    78.8    -      -       -      +
    372F  LEU*     1.3    64.7    +      -       -      +
    373F  HIS*     3.8     7.4    +      -       -      +
    374F  ASP*     3.0    29.8    +      -       -      +
    375F  GLN*     3.0    20.1    +      -       -      +
    471F  GLU*     3.3    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 372 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370F  LEU      3.7     1.0    +      -       -      -
    371F  THR*     1.3    72.0    -      -       -      +
    373F  HIS*     1.3    62.6    +      -       -      +
    375F  GLN*     3.4    16.1    +      -       -      +
    376F  VAL*     3.1    31.2    +      -       +      +
    691H  HIS*     3.3    43.3    -      -       +      +
    694H  LEU*     3.8    36.1    -      -       +      +
    695H  GLN*     3.6    23.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 373 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371F  THR*     3.1     8.8    -      -       -      +
    372F  LEU*     1.3    79.1    -      -       -      +
    374F  ASP*     1.3    65.5    +      -       -      +
    376F  VAL*     3.4     9.2    +      -       -      +
    377F  HIS*     3.1    20.6    +      -       -      +
    691H  HIS*     5.9     2.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 374 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370F  LEU*     4.6    13.8    -      -       +      +
    371F  THR*     3.0    21.3    +      -       -      +
    373F  HIS*     1.3    78.3    -      -       -      +
    375F  GLN*     1.3    61.2    +      -       -      +
    377F  HIS*     3.2    11.0    +      -       +      +
    378F  LEU*     2.9    37.0    +      -       +      +
    471F  GLU*     2.8    32.9    -      -       -      +
    475F  ILE*     5.6     5.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 375 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362F  LYS*     5.8     0.9    -      -       -      +
    367F  PHE*     2.8    55.2    +      -       +      +
    368F  VAL*     3.3    18.7    +      -       -      +
    370F  LEU*     3.1    20.1    +      -       +      +
    371F  THR      3.0    15.9    +      -       -      +
    372F  LEU*     3.6    15.3    -      -       -      +
    374F  ASP*     1.3    77.5    -      -       -      +
    376F  VAL*     1.3    62.3    +      -       -      +
    378F  LEU*     3.4     1.0    +      -       -      +
    379F  LEU*     3.1    28.4    +      -       -      +
    694H  LEU*     3.4    34.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 376 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372F  LEU*     3.1    17.2    +      -       +      +
    373F  HIS*     3.6     9.9    -      -       -      +
    375F  GLN*     1.3    77.4    -      -       -      +
    377F  HIS*     1.3    56.6    +      -       -      +
    380F  GLU*     2.9    60.1    +      -       -      +
    687H  HIS      4.3    12.1    -      -       -      +
    690H  LEU*     3.5    16.1    -      -       +      +
    691H  HIS*     4.0    35.2    -      -       +      +
    694H  LEU*     4.2    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 377 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373F  HIS      3.1    11.5    +      -       -      +
    374F  ASP*     3.2    14.8    +      -       +      +
    376F  VAL*     1.3    79.7    -      -       -      +
    378F  LEU*     1.3    66.6    +      -       +      +
    380F  GLU*     3.3    14.4    +      -       -      +
    381F  CYS*     3.1    25.3    +      -       +      +
    457F  GLY*     3.1    23.6    +      -       -      -
    460F  THR*     3.1    47.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 378 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367F  PHE*     4.0    17.7    -      -       +      -
    370F  LEU*     3.7    30.3    -      -       +      -
    374F  ASP*     2.9    18.1    +      -       +      +
    375F  GLN      3.4     3.8    +      -       -      +
    377F  HIS*     1.3    79.4    -      -       +      +
    379F  LEU*     1.3    57.7    +      -       -      +
    381F  CYS*     3.2     5.3    +      -       -      +
    382F  ALA*     2.9    32.4    +      -       -      +
    453F  LEU*     3.6    25.0    -      -       +      +
    454F  LEU*     4.0    17.5    -      -       +      +
    457F  GLY*     3.7    34.2    +      -       -      +
    458F  VAL*     3.9     4.7    -      -       -      +
    475F  ILE*     4.3     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 379 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354F  LEU*     6.1     0.2    -      -       +      -
    357F  MET*     4.2    27.6    -      -       +      +
    358F  ILE*     4.3    10.3    -      -       +      -
    361F  ALA*     4.0    14.8    -      -       +      -
    367F  PHE*     4.2    11.7    -      -       +      -
    375F  GLN      3.1    11.2    +      -       -      +
    376F  VAL      4.0     2.2    -      -       -      +
    378F  LEU*     1.3    74.7    -      -       -      +
    380F  GLU*     1.3    62.1    +      -       -      +
    382F  ALA*     4.4     0.4    -      -       -      +
    383F  TRP*     2.9    36.5    +      -       +      +
    386F  ILE*     5.0     1.3    -      -       +      -
    453F  LEU*     3.7    20.9    -      -       +      -
    543F  MET*     4.0     4.9    -      -       +      -
    690H  LEU*     3.7    31.0    -      -       +      -
    694H  LEU*     3.8    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 380 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    376F  VAL*     2.9    37.9    +      -       -      +
    377F  HIS*     3.6    14.9    +      -       -      +
    378F  LEU      3.3     0.2    -      -       -      -
    379F  LEU*     1.3    77.3    -      -       -      +
    381F  CYS*     1.3    49.2    +      -       -      +
    383F  TRP*     3.3     5.6    +      -       -      -
    542F  GLU      5.1     0.3    -      -       -      +
    543F  MET*     4.0    16.2    -      -       -      +
    546F  ALA*     3.6    30.2    -      -       +      +
    547F  HIS*     2.7    36.6    +      -       -      -
    687H  HIS*     3.2    31.6    +      -       -      +
    690H  LEU*     3.6    13.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 381 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    516E  HIS*     5.2     7.4    -      -       -      -
    377F  HIS*     3.1    21.6    +      -       +      +
    378F  LEU      3.6     4.0    -      -       -      +
    379F  LEU      3.1     0.8    -      -       -      -
    380F  GLU*     1.3    80.5    -      -       +      +
    382F  ALA*     1.3    57.2    +      -       -      +
    383F  TRP      3.7     0.4    -      -       -      -
    384F  LEU      5.4     0.3    +      -       -      -
    385F  GLU*     3.7    11.3    -      -       -      +
    456F  SER*     3.3    31.6    -      -       -      -
    457F  GLY*     3.8    12.8    -      -       -      +
    460F  THR*     4.8     6.3    -      -       -      -
    515F  ARG*     4.2    10.3    +      -       -      -
    518F  SER*     5.2     2.4    +      -       -      -
    522F  MET*     5.7     0.2    -      -       -      +
    547F  HIS*     3.7    23.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 382 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    378F  LEU      2.9    15.8    +      -       -      +
    379F  LEU*     4.9     0.2    -      -       -      -
    381F  CYS*     1.3    79.7    -      -       -      +
    383F  TRP*     1.3    65.8    +      -       -      +
    384F  LEU      3.3     2.7    -      -       -      -
    385F  GLU*     3.1    11.7    +      -       -      +
    386F  ILE*     3.0    27.6    +      -       +      +
    452F  ILE*     3.8    28.9    -      -       +      +
    453F  LEU*     4.2    11.7    -      -       +      +
    456F  SER*     3.9     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 383 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354F  LEU*     3.8    23.6    -      -       +      -
    357F  MET*     3.3    23.3    -      -       -      +
    379F  LEU*     2.9    18.5    +      -       +      +
    380F  GLU*     3.3    26.2    +      -       -      -
    381F  CYS      3.7     0.2    -      -       -      -
    382F  ALA*     1.3    76.3    -      -       -      +
    384F  LEU*     1.3    79.0    +      -       +      +
    386F  ILE      3.4     0.2    +      -       -      -
    387F  LEU*     3.0    47.8    +      -       +      +
    522F  MET*     3.8    23.3    -      -       +      +
    525F  LEU*     3.8    21.8    -      -       +      -
    540F  LEU*     3.6    30.1    -      -       +      -
    543F  MET*     3.4    45.2    -      -       +      +
    544F  LEU*     4.7     2.0    -      -       -      -
    547F  HIS*     3.9    14.0    +      -       -      -
    601F  6WT      4.5     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 384 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    381F  CYS      5.4     0.6    +      -       -      -
    382F  ALA      3.3     0.2    -      -       -      -
    383F  TRP*     1.3    93.4    -      -       +      +
    385F  GLU*     1.3    60.9    +      -       -      +
    387F  LEU*     3.3     7.4    +      -       +      -
    388F  MET*     2.9    64.5    +      -       +      +
    518F  SER*     3.3    36.1    +      -       -      +
    521F  GLY*     4.0     4.0    -      -       -      -
    522F  MET*     3.7    34.1    -      -       +      +
    525F  LEU*     4.6     5.2    -      -       +      -
    601F  6WT      4.1    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 385 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    512E  SER*     5.7     0.5    -      -       -      -
    381F  CYS      3.7    11.0    -      -       -      +
    382F  ALA*     3.1    10.4    +      -       -      +
    384F  LEU*     1.3    78.8    -      -       -      +
    386F  ILE*     1.3    56.4    +      -       -      +
    388F  MET*     3.4     1.0    +      -       -      -
    389F  ILE*     3.0    32.0    +      -       -      +
    452F  ILE*     3.6    19.0    -      -       +      +
    456F  SER*     2.8    32.4    +      -       -      -
    511F  LEU*     4.2     4.9    -      -       -      +
    514F  ILE*     3.8    21.8    -      -       +      +
    515F  ARG*     3.3    41.1    +      -       -      +
    518F  SER*     3.5    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 386 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357F  MET*     3.7    31.2    -      -       +      -
    360F  TRP*     3.7    24.9    -      -       +      -
    379F  LEU*     5.0     0.7    -      -       +      -
    382F  ALA*     3.0    19.7    +      -       +      +
    383F  TRP      3.8     3.8    -      -       -      +
    385F  GLU*     1.3    74.7    -      -       -      +
    387F  LEU*     1.3    65.8    +      -       +      +
    389F  ILE*     3.3     6.9    -      -       -      +
    390F  GLY*     3.1    20.8    +      -       -      -
    449F  LYS*     3.7    29.4    -      -       +      +
    452F  ILE*     4.0    14.4    -      -       +      -
    453F  LEU*     4.0    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 387 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350F  ALA*     3.9    28.7    -      -       +      +
    353F  GLU*     3.3    43.3    -      -       +      +
    354F  LEU*     4.7     1.1    -      -       +      +
    357F  MET*     3.6    18.2    -      -       +      -
    383F  TRP*     3.0    48.5    +      -       +      +
    384F  LEU*     3.7     9.9    -      -       +      +
    386F  ILE*     1.3    77.0    -      -       -      +
    388F  MET*     1.3    58.1    +      -       -      +
    390F  GLY*     3.2     2.3    +      -       -      -
    391F  LEU*     2.9    29.1    +      -       -      +
    601F  6WT      4.0    20.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 388 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    384F  LEU*     2.9    46.3    +      -       +      +
    385F  GLU*     3.8     4.5    -      -       -      +
    387F  LEU*     1.3    76.8    -      -       -      +
    389F  ILE*     1.3    58.2    +      -       -      +
    391F  LEU*     3.2     7.9    +      -       -      +
    392F  VAL*     2.8    33.9    +      -       -      +
    424F  ILE*     4.3     9.0    -      -       +      -
    428F  LEU*     4.0    17.4    -      -       +      +
    514F  ILE*     4.6     7.6    -      -       +      +
    517F  MET*     3.4    34.3    -      -       +      +
    518F  SER*     3.7    23.3    -      -       -      -
    521F  GLY*     4.4     2.7    -      -       -      -
    601F  6WT      3.9    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 389 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385F  GLU      3.0    17.5    +      -       -      +
    386F  ILE*     3.3    17.3    -      -       -      +
    388F  MET*     1.3    76.7    -      -       -      +
    390F  GLY*     1.3    60.5    +      -       -      +
    392F  VAL*     3.7     5.5    -      -       -      +
    393F  TRP*     2.9    28.9    +      -       -      +
    435F  PHE*     4.1    21.5    -      -       +      -
    445F  PHE*     4.1    16.2    -      -       +      -
    448F  LEU*     4.1    22.9    -      -       +      -
    449F  LYS*     4.3    16.2    -      -       +      +
    452F  ILE*     3.8    23.8    -      -       +      -
    511F  LEU*     4.5     1.8    -      -       +      -
    514F  ILE*     3.8    25.7    -      -       +      +
    517F  MET*     6.5     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 390 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    386F  ILE      3.1    15.3    +      -       -      -
    387F  LEU      3.6     3.6    -      -       -      -
    389F  ILE*     1.3    76.8    -      -       -      +
    391F  LEU*     1.3    63.7    +      -       -      +
    393F  TRP*     3.4     4.5    +      -       -      +
    394F  ARG*     3.3    35.0    +      -       -      +
    445F  PHE*     4.1    17.5    -      -       -      -
    449F  LYS*     5.4     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 391 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387F  LEU      2.9    13.6    +      -       -      +
    388F  MET*     3.2     6.5    +      -       -      +
    390F  GLY*     1.3    77.0    -      -       -      +
    392F  VAL*     1.3    59.0    +      -       -      +
    393F  TRP      3.3     0.2    +      -       -      -
    394F  ARG*     3.4    15.7    +      -       -      +
    395F  SER*     2.6    37.0    +      -       -      +
    402F  LEU*     4.3    11.0    -      -       +      -
    403F  LEU      3.4    35.0    -      -       -      +
    404F  PHE*     3.6    40.2    -      -       +      +
    428F  LEU*     3.9    29.2    -      -       +      -
    601F  6WT      4.2    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 392 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388F  MET      2.8    24.6    +      -       -      +
    389F  ILE*     3.7     7.2    -      -       -      +
    391F  LEU*     1.3    74.6    -      -       +      +
    393F  TRP*     1.3    61.8    +      -       -      +
    395F  SER*     3.3    12.6    +      -       -      -
    396F  MET*     3.5     3.8    +      -       -      +
    402F  LEU*     5.2     0.9    -      -       +      -
    428F  LEU*     3.6    39.7    -      -       +      +
    431F  THR*     3.7    14.6    -      -       +      -
    432F  SER*     3.3    34.1    +      -       -      +
    435F  PHE*     3.4    31.6    -      -       +      -
    517F  MET*     4.9     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 393 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323F  GLU*     5.2     1.6    +      -       -      -
    326F  ILE*     6.4     1.1    -      -       +      -
    389F  ILE      2.9    19.0    +      -       -      +
    390F  GLY      3.6     5.6    -      -       -      +
    391F  LEU      3.2     0.2    -      -       -      -
    392F  VAL*     1.3    79.9    -      -       -      +
    394F  ARG*     1.3    68.9    +      -       +      +
    395F  SER      3.3     0.7    +      -       -      -
    396F  MET*     3.5    46.2    +      -       +      +
    397F  GLU*     4.0     3.1    -      -       -      +
    435F  PHE*     4.8     3.4    -      -       +      -
    440F  LEU*     3.5    42.0    -      -       +      -
    441F  GLN      4.2     1.6    -      -       -      -
    442F  GLY*     3.5    32.8    -      -       -      -
    445F  PHE*     3.5    43.1    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 394 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326F  ILE*     3.7    41.6    -      -       +      +
    327F  LEU      6.2     0.4    -      -       -      -
    353F  GLU*     2.9    30.6    +      -       -      -
    390F  GLY*     3.3    22.4    +      -       -      +
    391F  LEU*     3.5    19.2    -      -       -      +
    393F  TRP*     1.3    86.8    -      -       +      +
    395F  SER*     1.3    57.7    +      -       -      +
    396F  MET      3.4     0.9    -      -       -      -
    397F  GLU*     3.5    14.6    -      -       -      +
    398F  HIS*     3.9     4.0    +      -       -      -
    403F  LEU*     2.8    49.0    +      -       +      +
    404F  PHE*     2.8    27.7    +      -       -      +
    405F  ALA*     5.1     0.2    -      -       -      +
    601F  6WT      3.3    15.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 395 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391F  LEU*     2.6    25.9    +      -       -      +
    392F  VAL      3.7     5.4    -      -       -      -
    393F  TRP      3.1     1.2    -      -       -      -
    394F  ARG*     1.3    78.0    -      -       -      +
    396F  MET*     1.3    63.2    +      -       -      +
    397F  GLU      3.3     2.9    -      -       -      -
    398F  HIS*     3.1    25.3    +      -       -      +
    401F  LYS      3.7    17.8    -      -       -      +
    402F  LEU*     3.6    11.1    -      -       -      +
    403F  LEU*     2.8    28.1    +      -       -      +
    432F  SER*     3.2    12.1    +      -       -      -
    436F  ARG*     4.2     0.5    +      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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