Contacts of the helix formed by residues 425 - 449 (chain B) in PDB entry 6R7Y


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 ASP 425 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    419B  ILE*     3.7     9.0    +      -       +      +
    420B  ALA*     5.2     0.2    -      -       -      +
    423B  LEU*     4.4    15.0    -      -       +      +
    424B  LYS*     1.3    77.1    -      -       -      +
    426B  MET*     1.3    61.9    +      -       -      +
    427B  LYS*     3.2    37.4    -      -       -      +
    428B  LEU*     3.3    28.0    +      -       +      +
    429B  LEU*     3.0    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 426 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    420B  ALA*     4.8     9.2    -      -       -      +
    424B  LYS*     4.3     6.9    +      -       +      +
    425B  ASP*     1.3    77.0    +      -       -      +
    427B  LYS*     1.3    66.1    +      -       -      +
    429B  LEU*     3.6    25.5    -      -       -      +
    430B  ARG*     3.1    44.3    +      -       -      +
    514B  VAL*     4.3    17.9    -      -       +      +
    573B  LEU*     3.7    26.0    -      -       +      +
    576B  MET*     4.1    30.7    -      -       +      +
    577B  SER*     5.0     3.4    -      -       -      +
    578B  PRO*     5.6     9.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 427 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    425B  ASP*     3.2    28.9    -      -       -      +
    426B  MET*     1.3    80.6    -      -       -      +
    428B  LEU*     1.3    61.1    +      -       -      +
    430B  ARG*     3.5     9.2    +      -       -      +
    431B  GLN*     3.3    29.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 428 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  TYR*     5.8     1.1    -      -       -      +
    337B  PHE*     5.2     3.4    -      -       +      -
    340B  GLU*     3.9    33.0    -      -       +      +
    419B  ILE*     4.2    22.0    -      -       +      -
    423B  LEU*     4.4    22.0    -      -       +      -
    425B  ASP*     3.3    27.0    +      -       +      +
    427B  LYS*     1.3    81.2    -      -       -      +
    429B  LEU*     1.3    58.6    +      -       -      +
    431B  GLN*     3.5    13.8    +      -       +      +
    432B  SER*     3.0    32.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 429 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    416B  LEU*     3.9    38.8    -      -       +      +
    419B  ILE*     3.8    15.6    -      -       +      +
    420B  ALA*     3.7    23.6    -      -       +      -
    425B  ASP      3.0    17.2    +      -       -      +
    426B  MET*     3.7    20.6    -      -       -      +
    427B  LYS      3.2     0.4    -      -       -      -
    428B  LEU*     1.3    75.0    -      -       -      +
    430B  ARG*     1.3    59.4    +      -       -      +
    432B  SER*     4.7     1.1    -      -       -      -
    433B  LEU*     2.9    39.9    +      -       +      +
    511B  PHE*     5.1     7.0    -      -       +      -
    514B  VAL*     3.8    29.2    -      -       +      -
    573B  LEU*     4.6     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 430 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233B  TYR*     3.3    39.5    -      -       -      +
    238B  GLU*     4.8    15.0    +      -       -      -
    243B  TYR*     4.9     6.1    +      -       -      -
    426B  MET*     3.1    35.9    +      -       -      +
    427B  LYS*     3.9     8.1    -      -       -      +
    429B  LEU*     1.3    76.2    -      -       -      +
    431B  GLN*     1.3    65.3    +      -       +      +
    433B  LEU*     4.2     1.0    -      -       -      +
    434B  ALA*     3.2    26.3    +      -       -      +
    514B  VAL*     2.5    39.0    +      -       +      +
    515B  TYR*     3.7    33.7    -      -       +      -
    516B  PRO*     5.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 431 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359B  LEU*     4.3    27.3    -      -       -      +
    360B  TYR*     4.3    31.2    +      -       +      +
    427B  LYS*     3.3    17.9    +      -       -      +
    428B  LEU*     3.9    14.5    -      -       +      +
    429B  LEU      3.3     0.2    -      -       -      -
    430B  ARG*     1.3    81.5    -      -       +      +
    432B  SER*     1.3    52.5    +      -       -      +
    434B  ALA*     4.1     2.8    -      -       -      +
    435B  THR*     2.7    39.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 432 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  TYR*     4.0    15.8    +      -       -      -
    363B  SER*     5.0     4.2    -      -       -      -
    366B  TYR*     6.1     0.3    -      -       -      -
    415B  SER*     4.6     2.1    +      -       -      -
    416B  LEU*     3.7    13.6    -      -       -      +
    419B  ILE*     3.8    21.5    -      -       -      +
    428B  LEU*     3.0    23.0    +      -       -      +
    429B  LEU      4.1     1.3    -      -       -      -
    431B  GLN*     1.3    78.5    -      -       -      +
    433B  LEU*     1.3    57.3    +      -       -      +
    435B  THR*     2.9    17.0    +      -       -      -
    436B  LEU*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 433 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    416B  LEU*     3.7    33.6    -      -       +      +
    429B  LEU*     2.9    22.6    +      -       +      +
    430B  ARG      4.2     2.0    -      -       -      +
    432B  SER*     1.3    74.7    -      -       -      +
    434B  ALA*     1.3    64.2    +      -       -      +
    436B  LEU*     4.0     1.0    -      -       -      +
    437B  LEU*     3.1    23.5    +      -       +      +
    507B  TYR*     3.8    33.0    -      -       +      +
    511B  PHE*     4.0    28.3    -      -       +      +
    514B  VAL*     5.4     1.6    -      -       +      -
    515B  TYR*     3.8    35.4    -      -       +      -
    518B  ALA*     4.5     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 434 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430B  ARG      3.2    16.8    +      -       -      +
    431B  GLN*     4.1     2.9    -      -       -      +
    433B  LEU*     1.3    78.4    -      -       -      +
    435B  THR*     1.3    63.0    -      -       +      +
    437B  LEU*     4.0     3.7    -      -       -      +
    438B  ILE*     3.2    33.3    +      -       +      +
    515B  TYR*     3.5    29.1    -      -       +      +
    521B  PHE*     4.4    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 435 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360B  TYR*     4.4    26.5    -      -       +      +
    363B  SER*     3.2    29.2    +      -       -      +
    364B  ILE*     5.4     3.8    -      -       +      -
    367B  ALA*     5.7     0.7    -      -       -      -
    431B  GLN*     2.7    24.5    +      -       -      +
    432B  SER*     2.9    16.5    +      -       -      -
    434B  ALA*     1.3    76.5    -      -       +      +
    436B  LEU*     1.3    58.6    +      -       -      +
    438B  ILE*     5.0     1.6    -      -       -      -
    439B  THR*     2.8    40.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 436 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    363B  SER*     4.1    11.0    -      -       -      +
    366B  TYR*     4.3    16.2    -      -       +      -
    367B  ALA*     3.8    31.6    -      -       +      +
    370B  ILE*     4.6     7.9    -      -       +      -
    412B  CYS      4.2    13.2    -      -       -      +
    415B  SER*     3.6    24.0    -      -       -      +
    416B  LEU*     4.1    14.8    -      -       +      -
    432B  SER*     3.0    22.4    +      -       -      +
    433B  LEU*     4.0     3.4    -      -       -      +
    435B  THR*     1.3    79.1    +      -       -      +
    437B  LEU*     1.3    61.8    +      -       -      +
    440B  SER*     3.0    29.3    +      -       -      -
    507B  TYR*     4.3    17.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 437 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433B  LEU*     3.1    18.3    +      -       +      +
    434B  ALA*     4.0     3.4    -      -       -      +
    436B  LEU*     1.3    77.3    -      -       -      +
    438B  ILE*     1.3    63.0    +      -       +      +
    440B  SER*     4.1     1.0    -      -       -      -
    441B  GLN*     3.1    53.7    +      -       +      +
    504B  GLN*     4.7     7.9    -      -       +      +
    507B  TYR*     3.6    45.5    -      -       +      -
    508B  VAL*     5.1     3.6    -      -       +      -
    518B  ALA*     3.6    38.6    -      -       +      +
    521B  PHE*     3.9    19.5    -      -       +      -
    522B  ALA*     4.8     1.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 438 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434B  ALA*     3.2    19.2    +      -       +      +
    435B  THR*     4.4     2.2    -      -       -      +
    437B  LEU*     1.3    77.7    -      -       +      +
    439B  THR*     1.3    59.5    +      -       -      +
    441B  GLN*     3.4     9.4    +      -       -      +
    442B  ILE*     2.9    47.4    +      -       +      +
    521B  PHE*     3.7    51.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 439 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    364B  ILE*     3.9    32.6    -      -       +      +
    367B  ALA*     3.7    25.6    -      -       +      -
    368B  ILE*     5.0     7.9    -      -       +      -
    435B  THR*     2.8    23.1    +      -       -      -
    438B  ILE*     1.3    75.2    -      -       -      +
    440B  SER*     1.3    60.9    +      -       -      +
    442B  ILE*     3.9     7.2    -      -       +      +
    443B  LEU*     2.9    32.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 440 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367B  ALA*     4.8    10.0    -      -       -      +
    370B  ILE*     6.1     3.1    -      -       -      -
    371B  GLU*     3.4    23.4    +      -       -      +
    412B  CYS*     5.7     3.7    -      -       -      -
    436B  LEU*     3.0    21.3    +      -       -      -
    437B  LEU*     4.2     2.7    -      -       -      -
    439B  THR*     1.3    76.4    -      -       -      +
    441B  GLN*     1.3    57.2    +      -       -      +
    443B  LEU*     3.7     4.5    -      -       -      +
    444B  ASN*     2.8    30.9    +      -       -      +
    507B  TYR*     5.0    14.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 441 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437B  LEU*     3.1    36.2    +      -       +      +
    438B  ILE*     3.8     9.7    -      -       -      +
    440B  SER*     1.3    76.5    -      -       -      +
    442B  ILE*     1.3    60.6    +      -       +      +
    444B  ASN*     3.3     6.5    +      -       +      +
    445B  GLN*     2.9    34.1    +      -       -      +
    500B  GLU*     5.6     3.1    -      -       +      +
    504B  GLN*     3.3    40.9    +      -       +      +
    521B  PHE      3.4    14.8    +      -       -      +
    522B  ALA*     4.2     1.6    -      -       -      +
    525B  ASN*     3.1    39.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 442 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438B  ILE*     2.9    37.4    +      -       +      +
    439B  THR*     3.9     7.9    -      -       +      +
    441B  GLN*     1.3    76.1    -      -       +      +
    443B  LEU*     1.3    61.6    +      -       +      +
    445B  GLN*     3.3     6.2    +      -       -      +
    446B  ILE*     3.0    44.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 443 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367B  ALA      5.0     1.3    -      -       -      +
    368B  ILE*     4.5    35.0    -      -       +      +
    371B  GLU*     3.7    32.2    -      -       +      +
    372B  ILE*     5.8     2.9    -      -       +      -
    375B  ARG*     4.9     0.3    +      -       -      -
    439B  THR*     2.9    20.6    +      -       +      +
    440B  SER*     4.0     4.9    -      -       -      +
    442B  ILE*     1.3    78.2    -      -       +      +
    444B  ASN*     1.3    64.7    +      -       -      +
    446B  ILE*     4.5    15.0    -      -       +      +
    447B  MET*     3.1    37.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 444 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371B  GLU*     4.4    13.7    +      -       -      +
    375B  ARG*     4.1    18.8    -      -       -      +
    440B  SER*     2.8    20.7    +      -       -      +
    441B  GLN*     3.5     9.0    -      -       -      +
    443B  LEU*     1.3    76.8    -      -       -      +
    445B  GLN*     1.3    57.2    +      -       -      +
    446B  ILE      3.2     0.2    +      -       -      -
    447B  MET*     3.7     0.7    -      -       -      +
    448B  GLU*     2.8    44.5    +      -       -      +
    500B  GLU*     2.9    23.0    +      -       -      +
    701B   CA      2.6    24.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 445 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441B  GLN      2.9    20.5    +      -       -      +
    442B  ILE*     3.3     6.2    +      -       -      +
    444B  ASN*     1.3    73.6    -      -       -      +
    446B  ILE*     1.3    61.8    +      -       +      +
    448B  GLU*     3.7     4.3    -      -       -      +
    449B  SER*     3.6     4.7    +      -       -      +
    450B  PHE*     3.4    42.8    +      -       +      -
    525B  ASN*     4.3    10.1    -      -       -      +
    528B  THR*     3.0    28.2    +      -       -      +
    529B  GLU*     2.9    15.6    +      -       -      +
    532B  SER*     3.3    33.8    +      -       -      -
    701B   CA      2.6    22.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 446 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442B  ILE*     3.0    31.9    +      -       +      +
    443B  LEU*     4.0    14.1    -      -       +      +
    444B  ASN      3.2     0.4    -      -       -      -
    445B  GLN*     1.3    80.7    -      -       +      +
    447B  MET*     1.3    79.2    +      -       -      +
    448B  GLU      3.4     0.5    +      -       -      -
    450B  PHE*     3.8    13.1    +      -       +      -
    451B  LEU*     3.2    39.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 447 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371B  GLU*     6.1     0.7    -      -       +      -
    375B  ARG*     3.6    32.2    +      -       -      +
    443B  LEU*     3.1    31.2    +      -       +      +
    446B  ILE*     1.3    91.9    -      -       -      +
    448B  GLU*     1.3    60.7    +      -       -      +
    451B  LEU*     3.8    23.7    -      -       +      +
    452B  PRO*     3.9    13.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 448 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    375B  ARG*     5.2     4.0    -      -       -      +
    444B  ASN*     2.8    27.8    +      -       -      +
    445B  GLN*     3.7     4.2    -      -       -      +
    447B  MET*     1.3    75.4    -      -       -      +
    449B  SER*     1.3    62.8    +      -       -      +
    452B  PRO*     3.5    15.3    -      -       -      +
    496B  ASP*     5.4     2.9    -      -       -      +
    497B  ASP*     2.7     4.0    -      -       -      +
    500B  GLU*     2.9     6.9    -      -       -      +
    529B  GLU*     3.1     1.6    -      -       -      +
    533B  ASP*     3.4     7.6    -      -       -      +
    536B  LYS*     2.7    40.8    +      -       +      +
    541B  PHE*     5.4     3.5    -      -       -      -
    701B   CA      2.8    27.7    -      -       -      -
    702B   CA      2.2    25.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 449 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    445B  GLN      3.6     6.1    +      -       -      -
    448B  GLU*     1.3    88.7    -      -       -      +
    450B  PHE*     1.3    77.5    +      -       -      +
    451B  LEU      3.6     1.3    -      -       -      -
    452B  PRO*     3.6     4.8    -      -       -      +
    453B  TYR*     3.0    29.5    +      -       -      +
    532B  SER*     2.7    42.1    +      -       -      -
    535B  LEU*     4.9     3.0    -      -       -      +
    536B  LYS*     4.2    16.6    -      -       -      -
    540B  VAL*     4.3     3.7    -      -       -      +
----------------------------------------------------------
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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