Contacts of the helix formed by residues 432 - 455 (chain F) in PDB entry 1XSK


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 432 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78F  ASN*     4.2    21.9    +      -       +      +
     79F  GLY      2.9    18.5    +      -       -      +
     80F  PRO*     4.2     0.2    -      -       -      +
    214F  GLN*     4.9     1.4    -      -       -      +
    430F  GLY      3.8     1.6    +      -       -      -
    431F  SER*     1.3    69.4    -      -       -      +
    433F  PRO*     1.3    73.2    -      -       -      +
    434F  GLN*     2.7    29.9    +      -       -      +
    435F  LYS*     3.1    27.2    +      -       +      +
    436F  MET*     3.1    20.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 433 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421F  ILE*     6.0     0.2    -      -       -      +
    422F  PRO      4.9     1.4    -      -       -      +
    423F  THR*     3.1    41.1    -      -       -      +
    425F  VAL      3.6    22.2    -      -       -      +
    426F  GLN*     5.4     0.7    -      -       -      -
    427F  TRP*     4.0    21.2    +      -       +      +
    431F  SER      3.2    10.3    -      -       -      +
    432F  ASP*     1.3    90.6    -      -       -      +
    434F  GLN*     1.3    62.6    +      -       +      +
    436F  MET*     3.4     1.0    +      -       -      +
    437F  HIS*     3.3    17.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 434 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182F  TRP*     3.5    33.3    -      -       -      -
    213F  PRO      4.2     0.3    -      -       -      +
    214F  GLN*     3.5    29.5    -      -       +      +
    215F  CYS*     5.7     0.9    +      -       -      +
    423F  THR*     3.3    31.4    +      -       -      +
    432F  ASP*     2.7    24.0    +      -       -      +
    433F  PRO*     1.3    75.7    -      -       +      +
    435F  LYS*     1.3    59.2    +      -       -      +
    437F  HIS*     3.9     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 435 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77F  ASN*     4.6     9.3    -      -       -      +
     78F  ASN      2.6    36.3    +      -       -      +
     79F  GLY      4.1     2.2    -      -       -      +
     80F  PRO*     3.5    28.5    -      -       +      +
     81F  HIS*     4.2    13.1    +      -       -      -
    212F  HIS*     6.1     0.4    -      -       -      -
    213F  PRO*     3.9    19.9    -      -       +      +
    214F  GLN*     3.4    45.3    -      -       +      +
    236F  TYR*     4.6    11.5    +      -       -      -
    432F  ASP*     3.1    19.5    +      -       -      +
    434F  GLN*     1.3    74.2    -      -       -      +
    436F  MET*     1.3    64.2    +      -       -      +
    437F  HIS      3.1     3.1    +      -       -      -
    438F  ASN      3.7     2.1    +      -       -      -
    439F  HIS*     3.3    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 436 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80F  PRO*     3.8    20.2    -      -       +      -
    389F  PHE*     6.3     0.9    -      -       +      -
    390F  THR*     3.9    28.0    -      -       +      -
    421F  ILE*     4.3     1.9    -      -       -      +
    427F  TRP*     3.6    42.2    -      -       +      +
    429F  ASP*     5.5     0.2    -      -       -      +
    431F  SER*     3.5    26.5    -      -       -      -
    432F  ASP      3.1    11.0    +      -       -      +
    433F  PRO      3.4     2.2    +      -       -      +
    435F  LYS*     1.3    74.6    -      -       -      +
    437F  HIS*     1.3    67.4    +      -       -      +
    438F  ASN      3.4     0.2    -      -       -      -
    439F  HIS*     3.8    11.0    -      -       -      -
    440F  TYR*     2.9    45.5    +      -       +      +
    443F  ILE*     4.9     7.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 437 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182F  TRP*     3.2    63.2    -      +       +      -
    183F  ASN*     2.7    27.4    +      -       +      -
    418F  GLY      4.7     2.1    -      -       -      +
    419F  GLU      3.0    24.5    +      -       -      +
    420F  ARG*     4.5     2.5    -      -       -      -
    421F  ILE*     2.7    56.2    +      -       -      +
    423F  THR*     4.8     0.2    -      -       +      -
    433F  PRO      3.3     8.8    +      -       -      +
    434F  GLN      3.9     3.4    -      -       -      +
    435F  LYS      3.1     1.2    -      -       -      -
    436F  MET*     1.3    80.6    -      -       -      +
    438F  ASN*     1.3    80.8    +      -       -      +
    440F  TYR*     3.7     2.9    -      -       -      +
    441F  ALA      4.7     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 438 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82F  TYR*     5.3     4.5    +      -       -      +
    181F  THR*     2.9    28.4    +      -       -      -
    182F  TRP*     4.0     3.8    -      -       -      +
    183F  ASN*     2.8    44.4    +      -       -      +
    196F  ASN*     5.1     5.5    -      -       -      +
    213F  PRO*     3.0    27.9    +      -       +      +
    214F  GLN      4.2     3.4    +      -       -      -
    435F  LYS      3.7     2.0    +      -       -      -
    437F  HIS*     1.3    82.3    -      -       -      +
    439F  HIS*     1.3    63.5    +      -       -      +
    440F  TYR      3.0     6.5    +      -       -      -
    441F  ALA*     3.2    15.1    +      -       -      +
    469F  SER*     3.2    25.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 439 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80F  PRO*     3.3    35.9    -      -       +      +
     81F  HIS      4.0    18.8    +      -       -      -
     82F  TYR*     4.9     9.3    -      -       -      -
     83F  PRO*     4.4     9.6    -      -       +      +
    213F  PRO*     4.9     6.0    -      -       +      +
    435F  LYS      3.3    18.4    +      -       -      +
    436F  MET*     4.2     7.2    -      -       -      -
    438F  ASN*     1.3    78.7    -      -       -      +
    440F  TYR*     1.3    62.7    +      -       -      +
    441F  ALA      3.2     0.4    -      -       -      -
    442F  TYR*     3.3    33.5    +      +       -      +
    443F  ILE*     3.2    46.3    +      -       +      +
    469F  SER*     4.1    11.3    +      -       -      +
    470F  VAL      5.5     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 440 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348F  PRO*     3.3    32.1    +      -       +      +
    386F  ILE*     3.5    11.0    -      -       +      +
    387F  TYR      2.9    28.0    +      -       -      -
    389F  PHE*     3.2    35.2    -      +       +      -
    418F  GLY*     3.9     9.0    -      -       -      -
    421F  ILE*     3.3    27.4    -      -       +      -
    427F  TRP*     3.7    29.8    -      +       -      -
    436F  MET*     2.9    29.2    +      -       +      +
    437F  HIS      3.7     9.0    -      -       -      +
    438F  ASN      3.0     0.6    +      -       -      -
    439F  HIS*     1.3    78.9    -      -       -      +
    441F  ALA*     1.3    62.7    +      -       -      +
    443F  ILE*     3.4     4.3    +      -       +      +
    444F  TYR*     3.0    30.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 441 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183F  ASN*     4.1     5.2    -      -       -      +
    418F  GLY      4.4     7.5    +      -       -      +
    437F  HIS      4.7     0.4    +      -       -      -
    438F  ASN      3.2    12.9    +      -       -      +
    440F  TYR*     1.3    80.3    -      -       -      +
    442F  TYR*     1.3    60.6    +      -       -      +
    444F  TYR*     3.5     5.1    -      -       -      +
    445F  ASN*     2.9    32.9    +      -       -      -
    467F  SER*     3.4    27.6    -      -       -      +
    468F  ALA*     3.7    27.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 442 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83F  PRO*     3.7    21.7    -      -       +      +
    438F  ASN      4.2     0.8    +      -       -      -
    439F  HIS*     3.3    38.6    +      +       -      +
    440F  TYR      3.2     0.4    -      -       -      -
    441F  ALA*     1.3    77.2    -      -       -      +
    443F  ILE*     1.3    68.5    +      -       +      +
    445F  ASN*     3.9     1.9    -      -       -      +
    446F  GLU*     2.8    62.9    +      -       -      +
    469F  SER*     4.4    12.6    -      -       -      +
    470F  VAL      3.8     6.5    -      -       -      +
    471F  GLY      3.4    36.3    -      -       -      -
    472F  ALA*     3.8    10.5    -      -       +      -
    474F  LYS*     3.0    23.3    +      -       -      -
    475F  PHE*     3.5    19.5    -      +       -      -
----------------------------------------------------------
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Residues in contact with ILE 443 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389F  PHE*     3.9    34.5    -      -       +      +
    390F  THR*     5.9     2.2    -      -       +      -
    395F  CYS*     5.5     2.7    -      -       -      -
    436F  MET*     4.9     8.7    -      -       +      -
    439F  HIS*     3.2    46.4    +      -       +      +
    440F  TYR*     3.8     8.5    -      -       +      +
    442F  TYR*     1.3    83.7    -      -       +      +
    444F  TYR*     1.3    63.9    +      -       -      +
    446F  GLU*     3.7    14.6    -      -       -      +
    447F  LEU*     3.1    24.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 444 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346F  ILE*     3.6     1.2    +      -       +      -
    347F  ASN*     3.1    15.6    +      -       -      -
    348F  PRO*     3.6    21.3    -      -       +      -
    389F  PHE*     3.8    32.7    -      +       +      -
    398F  TYR*     3.8    19.3    -      -       -      -
    415F  THR*     3.2    37.1    -      -       +      -
    416F  ASP      2.9    28.4    +      -       -      -
    417F  PHE      3.6    13.0    -      -       -      -
    418F  GLY*     4.4     6.1    -      -       -      -
    440F  TYR*     3.0    20.8    +      +       +      +
    441F  ALA*     3.5     3.4    -      -       -      +
    443F  ILE*     1.3    76.3    -      -       -      +
    445F  ASN*     1.3    73.8    +      -       -      +
    447F  LEU*     3.1    14.4    +      -       -      +
    448F  VAL*     3.2    22.5    +      -       +      +
    467F  SER*     4.6     2.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 445 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    415F  THR*     2.6    34.2    +      -       -      +
    441F  ALA      2.9    23.7    +      -       -      +
    442F  TYR*     4.0     2.7    -      -       -      +
    444F  TYR*     1.3    88.4    -      -       -      +
    446F  GLU*     1.3    58.1    +      -       -      +
    448F  VAL*     3.1     7.3    +      -       -      +
    449F  TRP*     2.8    31.0    +      -       -      +
    463F  LEU*     3.7    10.9    -      -       +      +
    465F  ALA*     3.4    12.4    -      -       -      +
    467F  SER*     3.3    25.5    +      -       -      +
    468F  ALA*     5.1     1.0    -      -       -      +
    472F  ALA*     5.5     3.0    -      -       +      +
    475F  PHE*     4.1    17.3    -      -       +      -
    478F  HIS*     5.4     2.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 446 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442F  TYR*     2.8    52.7    +      -       +      +
    443F  ILE*     3.7    15.8    -      -       -      +
    445F  ASN*     1.3    72.0    -      -       -      +
    447F  LEU*     1.3    57.8    +      -       -      +
    449F  TRP*     3.6     0.3    -      -       -      +
    450F  ASN*     2.9    47.1    +      -       -      +
    474F  LYS*     5.4     0.3    +      -       -      -
    475F  PHE*     3.5    29.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 447 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389F  PHE*     3.6    38.8    -      -       +      -
    395F  CYS*     3.8    33.0    -      -       +      +
    398F  TYR*     3.7    22.7    -      -       +      -
    399F  ALA*     4.2    15.7    -      -       +      -
    402F  LEU*     3.9    12.3    -      -       +      -
    443F  ILE*     3.1    13.7    +      -       +      +
    444F  TYR      3.3     9.6    -      -       -      +
    445F  ASN      3.1     0.2    -      -       -      -
    446F  GLU*     1.3    75.6    -      -       -      +
    448F  VAL*     1.3    68.3    +      -       -      +
    450F  ASN*     3.3     7.4    +      -       -      +
    451F  VAL*     3.2    18.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 448 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346F  ILE*     4.1     7.6    -      -       +      -
    398F  TYR*     4.4     1.6    -      -       +      -
    402F  LEU*     4.0    19.7    -      -       +      -
    413F  PHE*     3.5    32.3    -      -       +      -
    415F  THR*     3.7    26.7    -      -       +      -
    444F  TYR*     3.4    22.7    -      -       +      +
    445F  ASN      3.1     5.5    +      -       -      +
    447F  LEU*     1.3    81.1    -      -       +      +
    449F  TRP*     1.3    63.6    +      -       -      +
    451F  VAL*     3.1    12.8    +      -       -      +
    452F  LEU*     3.2    13.2    +      -       -      +
    463F  LEU*     3.7    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 449 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262F  ALA*     3.8    18.8    -      -       +      -
    263F  LEU      5.9     1.1    -      -       -      -
    445F  ASN      2.8    21.2    +      -       -      +
    446F  GLU      3.6     2.2    -      -       -      +
    448F  VAL*     1.3    72.7    -      -       -      +
    450F  ASN*     1.3    70.5    +      -       -      +
    452F  LEU*     3.2     7.1    +      -       -      +
    453F  LYS*     2.9    40.6    +      -       +      +
    458F  GLU*     4.6    17.1    -      -       +      +
    461F  ALA*     3.3    45.7    -      -       +      +
    462F  VAL*     4.1     5.8    -      -       -      -
    463F  LEU*     4.1    16.1    -      -       +      +
    474F  LYS      3.9     2.0    +      -       -      -
    475F  PHE*     3.2    45.3    -      +       +      -
    476F  PRO*     3.5    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 450 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    446F  GLU*     2.9    39.7    +      -       -      +
    447F  LEU*     3.8     6.8    -      -       -      +
    448F  VAL      3.3     0.2    -      -       -      -
    449F  TRP*     1.3    88.9    -      -       -      +
    451F  VAL*     1.3    56.3    +      -       -      +
    453F  LYS*     3.4    23.7    +      -       -      +
    454F  ASP*     2.6    43.8    +      -       -      +
    475F  PHE*     5.1     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 451 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    399F  ALA*     3.6    39.3    -      -       +      +
    402F  LEU*     3.8    27.8    -      -       +      -
    403F  LYS*     4.1    25.4    -      -       +      +
    406F  VAL*     4.4    11.7    -      -       +      -
    413F  PHE*     4.6     4.3    -      -       +      -
    447F  LEU      3.2    12.5    +      -       -      +
    448F  VAL      3.1    10.4    +      -       -      +
    450F  ASN*     1.3    74.1    -      -       -      +
    452F  LEU*     1.3    66.1    +      -       -      +
    454F  ASP*     3.2     4.7    +      -       -      +
    455F  THR*     2.8    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 452 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406F  VAL*     4.2    12.8    -      -       +      -
    411F  ASP      3.6    22.9    -      -       -      +
    412F  CYS*     4.4     2.7    -      -       -      -
    413F  PHE*     3.6    29.8    -      -       +      -
    448F  VAL      3.2     5.3    +      -       -      +
    449F  TRP*     3.5     9.0    -      -       +      +
    451F  VAL*     1.3    78.2    -      -       -      +
    453F  LYS*     1.3    63.9    +      -       -      +
    455F  THR*     3.0     3.3    +      -       -      -
    456F  VAL*     3.0    36.2    +      -       +      +
    457F  GLY      3.1     5.7    +      -       -      -
    461F  ALA*     3.7    13.9    -      -       +      -
    462F  VAL      3.3    35.4    -      -       -      +
    463F  LEU*     3.6    19.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 453 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    449F  TRP*     2.9    29.4    +      -       +      +
    450F  ASN*     3.4    26.7    +      -       -      +
    452F  LEU*     1.3    77.7    -      -       -      +
    454F  ASP*     1.3    76.0    +      -       -      +
    457F  GLY*     3.3    20.2    -      -       -      -
    458F  GLU*     3.6    42.8    +      -       +      +
    461F  ALA*     4.4     1.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 454 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    403F  LYS*     4.9    16.1    -      -       -      +
    450F  ASN*     2.6    30.7    +      -       -      +
    451F  VAL*     3.9     5.3    -      -       -      +
    453F  LYS*     1.3    91.5    -      -       -      +
    455F  THR*     1.3    62.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 455 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    403F  LYS*     4.1    31.2    -      -       +      +
    406F  VAL*     3.6    32.9    -      -       +      +
    451F  VAL*     2.8    23.0    +      -       +      +
    452F  LEU*     3.0    10.7    +      -       -      -
    454F  ASP*     1.3    83.5    -      -       -      +
    456F  VAL*     1.3    71.8    +      -       -      +
    457F  GLY*     3.1     1.8    +      -       -      -
----------------------------------------------------------
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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