Contacts of the helix formed by residues 374 - 402 (chain A) in PDB entry 1FCZ


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 TYR 374 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372A  GLN      3.1     1.8    +      -       -      -
    373A  PRO*     1.3    91.9    -      -       +      +
    375A  MET*     1.4    65.6    +      -       -      +
    376A  PHE      3.4     0.7    -      -       -      -
    377A  PRO*     3.3    14.7    -      -       +      +
    378A  ARG*     3.0    52.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 375 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  PRO      3.7    18.2    -      -       -      +
    321A  LEU*     3.8    26.9    -      -       +      +
    322A  GLU*     5.8     0.4    -      -       -      +
    365A  ALA*     5.2     7.6    -      -       +      +
    369A  ARG*     3.7    42.6    -      -       +      +
    372A  GLN*     2.9    53.7    +      -       +      +
    373A  PRO      3.2     0.6    -      -       -      -
    374A  TYR*     1.4    79.2    -      -       -      +
    376A  PHE*     1.3    58.6    +      -       -      +
    378A  ARG*     3.3     9.7    +      -       -      +
    379A  MET*     2.8    42.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 376 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  LEU*     3.6    25.4    -      -       +      -
    361A  LEU*     3.9    22.7    -      -       +      -
    362A  ARG*     3.6    62.8    -      -       +      -
    365A  ALA*     4.7    10.6    -      -       +      +
    366A  ARG*     5.4     6.2    -      -       +      +
    373A  PRO      4.4     2.5    +      -       -      +
    375A  MET*     1.3    77.5    -      -       -      +
    377A  PRO*     1.3    73.6    -      -       +      +
    379A  MET*     3.1    10.7    +      -       -      +
    380A  LEU*     3.0    53.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 377 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373A  PRO      3.7     8.1    -      -       -      +
    374A  TYR*     3.3    34.3    -      -       +      +
    376A  PHE*     1.3   103.2    -      -       +      +
    378A  ARG*     1.3    59.4    +      -       -      +
    380A  LEU*     3.3     9.7    +      -       +      +
    381A  MET*     3.0    35.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 378 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  LEU*     3.9    29.8    -      -       +      +
    374A  TYR*     3.0    49.8    +      -       +      +
    375A  MET*     3.6    12.1    -      -       -      +
    377A  PRO*     1.3    75.6    -      -       +      +
    379A  MET*     1.3    62.9    +      -       -      +
    381A  MET*     3.3    19.3    +      -       +      +
    382A  LYS*     3.1    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 379 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  LEU*     4.1    12.6    -      -       +      +
    323A  MET*     4.0    30.1    -      -       +      -
    327A  GLU*     3.5    34.3    -      -       +      +
    331A  LEU*     3.5    26.3    -      -       +      +
    361A  LEU*     4.0    28.5    -      -       +      -
    365A  ALA*     4.2    10.8    -      -       +      -
    369A  ARG*     3.8    18.2    -      -       -      +
    375A  MET*     2.8    29.5    +      -       +      +
    376A  PHE*     3.5     7.0    -      -       -      +
    378A  ARG*     1.3    72.3    -      -       -      +
    380A  LEU*     1.3    65.1    +      -       -      +
    382A  LYS*     3.1    19.6    +      -       -      +
    383A  ILE      3.6     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 380 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  LEU*     4.4     9.0    -      -       +      -
    334A  ILE*     4.5     5.4    -      -       +      -
    358A  LEU*     3.8    26.2    -      -       +      -
    361A  LEU*     4.5     1.8    -      -       +      -
    376A  PHE*     3.0    53.5    +      -       +      +
    377A  PRO*     3.3     9.2    +      -       +      +
    379A  MET*     1.3    75.2    -      -       -      +
    381A  MET*     1.3    64.8    +      -       +      +
    383A  ILE*     3.0    39.7    +      -       +      +
    384A  THR*     3.9     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 381 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    377A  PRO*     3.0    29.8    +      -       +      +
    378A  ARG*     3.7    22.0    -      -       +      +
    379A  MET      3.2     0.4    -      -       -      -
    380A  LEU*     1.3    77.4    -      -       +      +
    382A  LYS*     1.3    61.3    +      -       +      +
    384A  THR*     3.1    21.4    +      -       -      +
    385A  ASP*     3.3    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 382 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273A  LEU*     6.3     0.2    -      -       +      -
    314A  PHE*     4.0    20.5    +      -       +      -
    317A  GLN*     3.3    41.8    +      -       -      +
    318A  LEU*     4.1    13.2    -      -       +      -
    321A  LEU*     3.9    28.5    -      -       +      -
    323A  MET*     5.8     0.2    -      -       -      -
    331A  LEU*     4.6    10.8    -      -       +      -
    378A  ARG*     3.1    18.2    +      -       -      +
    379A  MET*     3.1    12.1    +      -       -      +
    381A  MET*     1.3    77.4    -      -       -      +
    383A  ILE*     1.3    55.9    +      -       -      +
    385A  ASP*     3.2    21.9    +      -       -      +
    386A  LEU*     2.8    32.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 383 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  LEU*     3.9    25.8    -      -       +      -
    334A  ILE*     3.6    30.7    -      -       +      +
    335A  CYS*     3.7    33.9    -      -       +      +
    380A  LEU*     3.0    22.5    +      -       +      +
    382A  LYS*     1.3    78.0    -      -       -      +
    384A  THR*     1.3    58.3    +      -       -      +
    386A  LEU*     3.3     8.6    +      -       -      +
    387A  ARG*     2.9    48.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 384 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    380A  LEU      4.3     5.2    +      -       -      -
    381A  MET*     3.1    14.6    +      -       -      +
    383A  ILE*     1.3    80.3    -      -       -      +
    385A  ASP*     1.3    65.4    +      -       -      +
    387A  ARG*     3.2    10.8    +      -       +      +
    388A  GLY*     3.1    17.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 385 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314A  PHE*     3.8    17.4    -      -       +      -
    381A  MET*     3.3    11.6    +      -       -      +
    382A  LYS*     3.2    33.2    +      -       -      +
    384A  THR*     1.3    79.3    -      -       -      +
    386A  LEU*     1.3    63.6    +      -       -      +
    388A  GLY*     3.1    11.7    +      -       -      -
    389A  ILE*     3.1    21.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 386 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    269A  ASP*     3.4    39.2    -      -       +      +
    270A  ILE*     5.4     0.2    -      -       -      -
    272A  MET*     4.0    11.4    -      -       +      -
    273A  LEU*     3.8    32.1    -      -       +      +
    314A  PHE*     3.9    25.7    -      -       +      -
    331A  LEU*     5.9     1.8    -      -       +      -
    335A  CYS*     4.0    26.7    -      -       -      -
    382A  LYS      2.8    18.3    +      -       -      +
    383A  ILE*     3.4     6.1    -      -       +      +
    385A  ASP*     1.3    78.1    -      -       -      +
    387A  ARG*     1.3    56.7    +      -       -      +
    389A  ILE*     3.2     7.0    +      -       +      +
    390A  SER*     2.8    31.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 387 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    269A  ASP*     3.4    18.6    -      -       -      +
    335A  CYS*     5.2     0.6    +      -       -      +
    338A  CYS*     3.1    34.4    -      -       -      +
    340A  ASP*     3.0    24.6    +      -       -      -
    341A  ARG*     3.5    29.8    -      -       -      +
    383A  ILE*     2.9    32.3    +      -       +      +
    384A  THR*     3.2    12.8    +      -       +      +
    386A  LEU*     1.3    76.3    -      -       -      +
    388A  GLY*     1.3    62.1    +      -       -      +
    390A  SER*     3.1     2.0    +      -       -      -
    391A  THR*     2.9    30.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 388 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    384A  THR      3.1     8.8    +      -       -      -
    385A  ASP*     3.1     9.1    +      -       -      -
    387A  ARG*     1.3    76.8    -      -       -      +
    389A  ILE*     1.3    61.3    +      -       -      +
    391A  THR*     3.4     7.4    +      -       -      -
    392A  LYS*     3.1    29.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 389 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272A  MET*     3.7    13.3    -      -       +      +
    307A  LEU*     4.3    10.9    -      -       +      +
    310A  LEU*     3.6    21.8    -      -       +      +
    311A  VAL*     3.8    26.9    -      -       +      -
    314A  PHE*     3.5    36.1    -      -       +      -
    385A  ASP*     3.1    18.9    +      -       +      +
    386A  LEU*     3.9     7.0    -      -       +      +
    388A  GLY*     1.3    77.3    -      -       -      +
    390A  SER*     1.3    57.8    +      -       -      +
    392A  LYS*     3.2     9.2    +      -       +      +
    393A  GLY*     2.8    25.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 390 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  LEU*     3.5    13.1    -      -       -      +
    269A  ASP*     2.7    49.9    +      -       -      -
    272A  MET*     3.6    16.3    -      -       -      -
    386A  LEU      2.8     9.0    +      -       -      -
    387A  ARG*     3.1    11.4    +      -       -      +
    389A  ILE*     1.3    74.6    -      -       -      +
    391A  THR*     1.3    64.7    +      -       -      +
    393A  GLY*     3.1     0.7    +      -       -      -
    394A  ALA*     2.9    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 391 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387A  ARG*     2.9    19.8    +      -       -      +
    388A  GLY*     3.5     7.2    -      -       -      +
    390A  SER*     1.3    77.4    +      -       -      +
    392A  LYS*     1.3    64.0    +      -       +      +
    394A  ALA*     3.3     9.2    +      -       -      +
    395A  GLU*     3.2    34.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 392 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307A  LEU*     3.8    17.1    -      -       +      +
    310A  LEU*     3.8    31.4    -      -       +      +
    388A  GLY      3.1    16.6    +      -       -      +
    389A  ILE*     3.2    12.8    +      -       +      +
    391A  THR*     1.3    77.2    -      -       +      +
    393A  GLY*     1.3    57.6    +      -       -      +
    395A  GLU*     3.1    21.4    +      -       -      +
    396A  ARG*     2.8    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 393 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  LEU*     4.0     7.4    -      -       -      +
    272A  MET*     3.8    11.7    -      -       -      -
    307A  LEU*     3.5    18.1    -      -       -      +
    389A  ILE      2.8    13.4    +      -       -      -
    390A  SER      3.1     4.6    +      -       -      -
    392A  LYS*     1.3    77.5    -      -       -      +
    394A  ALA*     1.3    55.8    +      -       -      +
    396A  ARG*     3.2     2.8    +      -       -      +
    397A  ALA*     2.9    26.9    +      -       -      +
    450A  156      3.8    10.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 394 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  LEU*     3.8     8.1    -      -       +      +
    390A  SER      2.9    11.8    +      -       -      +
    391A  THR*     3.6    10.3    -      -       -      +
    393A  GLY*     1.3    74.5    -      -       -      +
    395A  GLU*     1.3    63.5    +      -       +      +
    397A  ALA*     3.2    17.5    +      -       -      +
    398A  ILE*     3.3    18.3    +      -       -      +
    401A  LYS*     4.7     0.3    +      -       -      -
    416A  LEU*     4.4    12.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 395 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391A  THR*     3.2    24.6    +      -       +      +
    392A  LYS*     3.1    28.4    +      -       -      +
    394A  ALA*     1.3    75.5    -      -       +      +
    396A  ARG*     1.3    62.8    +      -       -      +
    398A  ILE*     3.2    23.8    +      -       +      +
    399A  THR*     3.4    15.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 396 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    221A  GLN      4.0     8.9    +      -       -      -
    303A  GLY*     2.9    29.5    +      -       -      +
    304A  PHE      3.5    17.0    +      -       -      +
    305A  GLY*     3.9    10.5    -      -       -      -
    306A  PRO*     3.9    20.2    -      -       -      +
    307A  LEU*     4.3     9.9    -      -       +      +
    392A  LYS      2.8    15.6    +      -       -      +
    393A  GLY*     3.2     9.4    +      -       -      +
    395A  GLU*     1.3    73.8    -      -       -      +
    397A  ALA*     1.3    60.9    +      -       -      +
    399A  THR*     3.0    25.5    +      -       -      -
    400A  LEU*     2.8    43.1    +      -       +      +
    403A  GLU*     2.9    42.8    +      -       -      -
    450A  156      4.3    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 397 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    393A  GLY      2.9    13.3    +      -       -      +
    394A  ALA      3.2     8.9    +      -       -      +
    396A  ARG*     1.3    77.0    -      -       -      +
    398A  ILE*     1.3    59.2    +      -       -      +
    400A  LEU*     4.3     1.3    -      -       -      -
    401A  LYS*     2.8    48.1    +      -       -      +
    408A  MET*     3.6    10.6    -      -       +      +
    416A  LEU*     3.6    23.6    -      -       +      -
    450A  156      4.0    15.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 398 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    394A  ALA      3.3    13.2    +      -       -      +
    395A  GLU*     3.2    16.5    +      -       +      +
    396A  ARG      3.2     0.8    -      -       -      -
    397A  ALA*     1.3    78.4    -      -       -      +
    399A  THR*     1.3    70.0    +      -       +      +
    401A  LYS*     3.5    29.4    +      -       +      +
    402A  MET*     3.8    13.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 399 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    395A  GLU      3.4     8.9    +      -       -      +
    396A  ARG*     3.0    41.3    +      -       -      -
    398A  ILE*     1.3    81.5    -      -       +      +
    400A  LEU*     1.3    63.7    +      -       -      +
    402A  MET*     3.0    38.8    +      -       +      +
    403A  GLU*     3.6    11.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 400 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222A  LEU*     3.8    28.9    -      -       +      -
    227A  TRP*     3.7    19.7    -      -       +      -
    303A  GLY*     3.7    17.5    -      -       -      +
    396A  ARG*     2.8    44.0    +      -       -      +
    397A  ALA      3.8     3.6    -      -       -      +
    399A  THR*     1.3    73.7    +      -       -      +
    401A  LYS*     1.3    65.2    +      -       -      +
    403A  GLU*     2.8    23.6    +      -       -      +
    404A  ILE*     3.2    20.1    +      -       +      +
    408A  MET*     3.8     9.2    -      -       +      -
    450A  156      3.7    32.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 401 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    394A  ALA      4.7     0.4    +      -       -      -
    397A  ALA*     2.8    53.7    +      -       -      +
    398A  ILE*     3.2    22.6    -      -       +      +
    399A  THR      3.1     0.4    -      -       -      -
    400A  LEU*     1.3    77.0    -      -       -      +
    402A  MET*     1.3    61.9    +      -       +      +
    403A  GLU      3.6     0.3    +      -       -      -
    404A  ILE*     3.7    25.1    -      -       +      +
    406A  GLY      4.9     1.4    -      -       -      +
    408A  MET*     3.8    18.8    -      -       +      +
    413A  ARG*     6.3     2.7    -      -       -      -
    416A  LEU*     3.7    18.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 402 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398A  ILE*     3.8    13.0    -      -       +      +
    399A  THR*     3.4    35.4    -      -       +      +
    400A  LEU      3.0     0.8    -      -       -      -
    401A  LYS*     1.3    79.9    -      -       +      +
    403A  GLU*     1.3    59.5    +      -       +      +
    404A  ILE      3.5     2.9    -      -       -      +
----------------------------------------------------------
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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