Contacts of the helix formed by residues 453 - 476 (chain A) in PDB entry 6QNW


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 CYS 453 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414A  ALA      3.4    20.9    -      -       -      -
    415A  CYS      4.2     0.4    -      -       -      -
    416A  GLU      3.8     8.3    -      -       -      -
    417A  LEU*     4.4     3.9    -      -       -      +
    418A  THR*     4.1     1.8    +      -       -      -
    422A  TRP*     4.3     2.3    -      -       -      -
    450A  VAL      3.0    17.3    +      -       -      +
    451A  SER      3.0     3.7    +      -       -      +
    452A  HIS*     1.3    80.2    -      -       -      +
    454A  ARG*     1.3    74.0    +      -       -      +
    455A  ALA*     3.2    13.5    -      -       -      -
    456A  THR*     3.1    20.8    +      -       -      +
    457A  GLU      3.5     3.8    +      -       -      -
    638A  ARG*     3.7    42.6    -      -       +      -
    641A  LEU*     4.3     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 454 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284A  LEU      5.4     1.3    -      -       -      -
    285A  MET*     6.3     1.1    -      -       -      +
    289A  LYS*     3.4    20.6    -      -       -      +
    413A  LYS*     3.8    36.6    +      -       +      +
    414A  ALA      3.9     3.4    -      -       -      +
    416A  GLU*     3.2    21.7    +      -       -      +
    417A  LEU      4.9     4.6    +      -       -      -
    418A  THR*     3.5    26.6    -      -       +      +
    453A  CYS*     1.3    73.6    -      -       -      +
    455A  ALA*     1.3    60.8    +      -       -      +
    457A  GLU*     3.0    35.3    +      -       -      +
    458A  TYR*     2.9    55.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 455 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414A  ALA      3.5     4.9    +      -       -      +
    453A  CYS*     3.2     5.6    -      -       -      -
    454A  ARG*     1.3    77.2    -      -       -      +
    456A  THR*     1.3    57.4    +      -       -      +
    458A  TYR*     3.2    15.3    +      -       +      +
    459A  ILE*     2.9    32.9    +      -       -      +
    641A  LEU*     3.6    23.6    -      -       +      -
    642A  ALA*     3.8    31.4    -      -       +      -
    645A  VAL*     4.0     7.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 456 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422A  TRP*     3.6    16.8    -      -       +      +
    423A  ILE*     3.5    32.3    -      -       +      -
    450A  VAL*     2.9    26.6    +      -       +      +
    451A  SER      3.4     8.3    -      -       -      +
    453A  CYS      3.1    10.1    +      -       -      -
    455A  ALA*     1.3    75.5    -      -       -      +
    457A  GLU*     1.3    65.1    +      -       -      +
    459A  ILE*     3.2    11.4    +      -       +      +
    460A  MET*     3.0    27.0    +      -       +      +
    585A  LEU*     4.9     7.7    -      -       +      +
    641A  LEU*     3.7     9.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 457 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284A  LEU      5.7     0.5    -      -       -      +
    289A  LYS*     3.8    10.3    +      -       -      -
    418A  THR*     4.5     1.0    -      -       -      +
    422A  TRP*     3.2    50.8    +      -       +      +
    453A  CYS      3.5     2.6    +      -       -      -
    454A  ARG*     3.0    43.9    +      -       -      +
    456A  THR*     1.3    77.9    -      -       -      +
    458A  TYR*     1.3    65.5    +      -       +      +
    460A  MET*     3.5     1.0    +      -       -      +
    461A  LYS*     2.9    33.7    +      -       +      +
    501A  TYR*     2.4    42.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 458 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     4.2    12.8    -      +       +      -
    284A  LEU*     3.1    52.8    +      -       +      +
    285A  MET*     3.6    11.4    +      -       -      +
    410A  GLU*     4.6     1.7    +      -       -      -
    413A  LYS*     4.6     2.8    -      -       -      +
    414A  ALA*     3.8    28.3    +      -       +      +
    454A  ARG*     2.9    43.6    +      -       +      +
    455A  ALA*     3.2    16.8    +      -       +      +
    457A  GLU*     1.3    83.8    -      -       +      +
    459A  ILE*     1.3    62.5    +      -       -      +
    461A  LYS*     3.4     7.8    +      -       +      +
    462A  GLY*     2.9    21.8    +      -       -      -
    581A  MET*     4.4     2.9    -      -       -      +
    645A  VAL*     4.1    14.6    -      -       +      -
    646A  PHE*     4.1    22.7    -      +       -      -
    649A  LEU*     5.3     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 459 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    455A  ALA      2.9    18.2    +      -       -      +
    456A  THR*     3.6    12.6    -      -       +      +
    458A  TYR*     1.3    77.5    -      -       -      +
    460A  MET*     1.3    65.9    +      -       -      +
    462A  GLY*     3.3     0.7    +      -       -      -
    463A  VAL*     2.9    36.8    +      -       +      +
    581A  MET*     3.7    28.9    -      -       +      +
    582A  ARG*     3.6    30.3    -      -       +      +
    584A  CYS*     4.0     6.5    -      -       +      -
    585A  LEU*     4.2    17.7    -      -       +      -
    641A  LEU*     4.0    13.2    -      -       +      -
    645A  VAL*     3.5    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 460 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422A  TRP*     3.3    40.6    -      -       +      +
    423A  ILE*     5.6     3.6    -      -       -      -
    424A  GLU*     4.4    12.1    -      -       -      +
    456A  THR*     3.0    21.8    +      -       +      +
    457A  GLU      4.0     2.9    -      -       -      +
    459A  ILE*     1.3    83.4    -      -       -      +
    461A  LYS*     1.3    58.1    +      -       -      +
    463A  VAL*     3.6     2.7    -      -       +      +
    464A  TYR*     2.9    58.6    +      -       +      +
    487A  SER*     5.4     3.4    -      -       -      -
    488A  LYS      5.3     7.6    -      -       -      +
    582A  ARG*     4.1    28.0    -      -       -      +
    553B  LYS*     4.2    14.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 461 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     3.4    25.3    -      -       +      -
    283A  LEU      2.8    27.3    +      -       -      +
    284A  LEU      5.0     1.8    +      -       -      -
    287A  ALA*     3.3    22.0    -      -       -      +
    457A  GLU*     2.9    22.8    +      -       +      +
    458A  TYR*     3.6     9.2    -      -       +      +
    460A  MET*     1.3    77.4    -      -       -      +
    462A  GLY*     1.3    64.0    +      -       -      +
    464A  TYR*     3.9     1.4    -      -       -      -
    465A  ILE*     2.9    37.9    +      -       +      +
    485A  MET*     4.1     9.6    -      -       -      -
    487A  SER*     4.8     9.5    -      -       -      -
    501A  TYR*     3.4    51.5    -      -       +      +
    524A  GLU*     4.5     3.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 462 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     3.8    24.1    -      -       -      -
    458A  TYR      2.9    12.9    +      -       -      -
    459A  ILE      3.8     2.7    -      -       -      -
    461A  LYS*     1.3    76.4    -      -       -      +
    463A  VAL*     1.3    62.8    +      -       -      +
    465A  ILE*     4.0     2.2    -      -       -      +
    466A  ASN*     2.9    34.9    +      -       -      -
    578A  GLY      3.4     5.8    -      -       -      -
    581A  MET*     4.2     7.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 463 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    459A  ILE*     2.9    25.9    +      -       +      +
    460A  MET*     3.6     6.3    -      -       +      +
    462A  GLY*     1.3    76.1    -      -       -      +
    464A  TYR*     1.3    69.5    +      -       +      +
    466A  ASN*     4.0     0.7    -      -       -      +
    467A  THR*     2.6    40.9    +      -       -      +
    578A  GLY      3.3    13.0    +      -       -      +
    579A  MET*     3.4    26.4    -      -       -      +
    581A  MET*     4.2    11.0    -      -       +      +
    582A  ARG*     3.3    34.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 464 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298A  GLU*     4.5    13.7    +      -       -      -
    424A  GLU*     4.6     8.8    +      -       -      -
    460A  MET*     2.9    38.9    +      -       +      +
    461A  LYS*     3.9     3.1    -      -       -      +
    463A  VAL*     1.3    85.7    -      -       +      +
    465A  ILE*     1.3    65.3    +      -       +      +
    467A  THR*     3.4     7.6    +      -       +      -
    468A  ALA*     2.9    25.6    +      -       -      +
    486A  ILE*     3.2    30.7    -      -       +      +
    487A  SER*     3.6     9.0    -      -       -      -
    488A  LYS*     3.8    41.1    +      -       +      +
    582A  ARG*     5.6     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 465 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     5.5     8.7    -      -       +      -
    461A  LYS*     2.9    32.9    +      -       +      +
    462A  GLY*     4.0     4.7    -      -       -      +
    464A  TYR*     1.3    79.6    -      -       -      +
    466A  ASN*     1.3    62.5    +      -       -      +
    468A  ALA*     3.8     4.0    -      -       +      +
    469A  LEU*     2.9    34.2    +      -       +      +
    483A  ILE*     5.3     3.1    -      -       +      +
    484A  PRO      4.4     3.4    -      -       -      +
    485A  MET*     3.4    54.7    -      -       +      -
    486A  ILE      3.9     9.0    -      -       -      +
    501A  TYR*     5.8     0.2    -      -       +      -
    504A  ILE*     4.1    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 466 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     5.6     3.0    -      -       -      -
    462A  GLY*     2.9    29.2    +      -       -      +
    465A  ILE*     1.3    78.9    -      -       -      +
    467A  THR*     1.3    57.8    +      -       -      +
    469A  LEU*     4.0     7.4    -      -       -      +
    470A  LEU*     2.9    33.8    +      -       -      +
    570A  THR*     5.2     1.6    +      -       -      -
    574A  LYS      4.3     2.7    +      -       -      +
    575A  MET*     3.3    41.6    -      -       -      +
    577A  TRP      4.8     1.0    +      -       -      -
    578A  GLY*     3.5    22.4    +      -       -      -
    579A  MET*     3.6     9.6    -      -       +      -
    581A  MET*     4.9     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 467 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463A  VAL*     2.6    32.8    +      -       -      +
    464A  TYR*     3.7     8.1    -      -       +      -
    466A  ASN*     1.3    76.7    -      -       -      +
    468A  ALA*     1.3    56.9    +      -       -      +
    470A  LEU*     4.0     0.9    -      -       -      +
    471A  ASN*     2.9    39.2    +      -       +      +
    579A  MET*     3.4    31.8    -      -       +      +
    557B  TYR*     4.7    14.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 468 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303A  PRO*     6.3     3.6    -      -       +      -
    464A  TYR      2.9    17.2    +      -       -      +
    465A  ILE*     3.8     4.7    -      -       +      +
    467A  THR*     1.3    76.2    -      -       -      +
    469A  LEU*     1.3    58.3    +      -       -      +
    471A  ASN*     3.4     5.1    +      -       -      +
    472A  ALA*     2.9    30.8    +      -       -      +
    483A  ILE*     3.7    22.2    -      -       +      +
    484A  PRO*     4.8     7.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 469 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    465A  ILE*     2.9    21.0    +      -       +      +
    466A  ASN*     4.0     7.0    -      -       -      +
    467A  THR      3.3     0.2    -      -       -      -
    468A  ALA*     1.3    78.1    -      -       -      +
    470A  LEU*     1.3    57.3    +      -       -      +
    472A  ALA*     3.3     2.8    +      -       -      +
    473A  SER*     2.9    45.3    +      -       -      +
    483A  ILE*     4.0    21.9    -      -       +      +
    504A  ILE*     4.5    24.9    -      -       +      -
    506A  LYS*     4.4    13.5    -      -       +      -
    518A  VAL*     4.5     6.1    -      -       +      -
    520A  PHE*     4.6    15.3    -      -       +      -
    570A  THR*     4.2    22.7    -      -       +      -
    575A  MET*     3.6    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 470 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466A  ASN      2.9    17.5    +      -       -      +
    467A  THR      4.1     1.8    -      -       -      +
    469A  LEU*     1.3    76.9    -      -       -      +
    471A  ASN*     1.3    62.3    +      -       -      +
    473A  SER*     3.3    16.1    +      -       -      -
    474A  CYS*     3.7     8.5    +      -       -      +
    511A  LEU*     5.3     1.8    -      -       +      -
    572A  LYS*     3.9    32.5    -      -       +      +
    575A  MET*     3.6    36.5    -      -       +      -
    576A  LYS*     5.1     7.9    -      -       +      +
    579A  MET*     3.7    25.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 471 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    467A  THR*     2.9    25.4    +      -       +      +
    468A  ALA*     3.8     5.4    -      -       -      +
    470A  LEU*     1.3    76.1    -      -       -      +
    472A  ALA*     1.3    60.6    +      -       -      +
    474A  CYS*     3.5    17.4    +      -       -      +
    475A  ALA*     3.9     8.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 472 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  ALA      2.9    17.4    +      -       -      +
    469A  LEU      3.7     4.0    -      -       -      +
    470A  LEU      3.3     0.2    -      -       -      -
    471A  ASN*     1.3    72.7    -      -       -      +
    473A  SER*     1.3    55.5    +      -       -      +
    474A  CYS      3.0     5.7    +      -       -      -
    475A  ALA*     5.7     1.3    -      -       -      -
    476A  ALA*     2.9    36.4    +      -       -      +
    481A  GLN*     3.5    34.3    -      -       -      +
    483A  ILE*     4.0    16.4    -      -       +      -
    506A  LYS*     3.7     6.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 473 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    469A  LEU*     2.9    32.3    +      -       -      +
    470A  LEU*     3.3    15.0    +      -       -      -
    472A  ALA*     1.3    73.0    -      -       -      +
    474A  CYS*     1.3    57.0    +      -       -      +
    477A  MET*     4.5     3.5    -      -       -      +
    506A  LYS*     3.5    13.8    -      -       -      +
    509A  SER*     3.1    41.0    +      -       -      +
    511A  LEU*     3.9    23.7    -      -       -      +
    518A  VAL*     4.3     2.3    -      -       -      +
    575A  MET*     4.4     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 474 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470A  LEU      3.7     6.5    +      -       -      +
    471A  ASN*     3.5    12.5    +      -       -      +
    472A  ALA      3.0     0.8    -      -       -      -
    473A  SER*     1.3    78.8    -      -       -      +
    475A  ALA*     1.3    65.6    +      -       +      +
    476A  ALA      3.5     0.2    -      -       -      -
    477A  MET*     3.9    19.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 475 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471A  ASN      3.9     7.1    +      -       -      +
    472A  ALA*     3.6     2.1    +      -       -      -
    474A  CYS*     1.3    77.3    -      -       +      +
    476A  ALA*     1.3    57.2    +      -       -      +
    477A  MET*     3.3     8.0    +      -       -      +
    479A  ASP*     4.9     0.7    -      -       -      +
    481A  GLN*     6.0     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 476 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    359A  ASN*     5.2     0.7    -      -       -      +
    472A  ALA*     2.9    15.7    +      -       -      +
    475A  ALA*     1.3    75.5    -      -       -      +
    477A  MET*     1.3    54.6    +      -       -      +
    478A  ASP      3.0    11.6    +      -       -      -
    479A  ASP*     3.3    19.8    -      -       -      +
    481A  GLN*     3.2    32.5    -      -       +      +
    506A  LYS*     2.7    37.0    +      -       -      +
    509A  SER*     3.7     4.0    -      -       -      -
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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) +   -    +    +   +   +    +    -
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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