Contacts of the helix formed by residues 406 - 430 (chain A) in PDB entry 1O86


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 ASN 406 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  MET      4.4     7.4    -      -       -      +
    224A  TYR*     3.5    23.7    -      -       +      -
    404A  GLY*     3.7     9.3    -      -       -      -
    405A  ALA*     1.3    77.6    -      -       -      +
    407A  PRO*     1.3    74.7    -      -       +      +
    408A  GLY*     2.6    35.9    +      -       -      -
    409A  PHE*     3.0    33.1    +      -       -      +
    410A  HIS      3.6     3.1    +      -       -      -
    525A  VAL*     4.2     6.7    -      -       -      +
    570A  PHE*     5.0     1.6    -      -       -      -
    574A  TRP*     3.4    35.0    -      -       +      +
    587A  MET*     5.7     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 407 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    223A  MET*     4.1    31.4    -      -       +      +
    224A  TYR*     3.5    21.3    -      -       +      +
    404A  GLY*     5.8     0.7    -      -       -      +
    406A  ASN*     1.3    87.6    -      -       +      +
    408A  GLY*     1.3    59.8    +      -       -      +
    410A  HIS*     3.3    17.7    +      -       +      +
    411A  GLU*     3.3    18.2    +      -       -      +
    522A  ARG*     3.7    24.7    -      -       -      +
    570A  PHE*     6.0     0.4    -      -       +      -
    704A   CL      3.6    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 408 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    224A  TYR*     3.8     3.8    +      -       -      -
    406A  ASN*     2.6    16.8    +      -       -      -
    407A  PRO*     1.3    74.9    -      -       -      +
    409A  PHE*     1.3    58.7    +      -       -      -
    411A  GLU*     3.2     3.6    +      -       -      +
    412A  ALA*     3.0    23.9    +      -       -      +
    522A  ARG*     3.5    21.1    -      -       -      -
    525A  VAL*     3.9    14.4    -      -       -      -
    526A  SER*     3.7     3.9    -      -       -      -
    529A  ILE*     3.8     6.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 409 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  TYR*     3.7    22.0    -      +       +      +
    405A  ALA*     3.6    14.1    -      -       +      +
    406A  ASN*     3.0    42.3    +      -       -      +
    408A  GLY*     1.3    76.0    -      -       -      +
    410A  HIS*     1.3    63.6    +      -       -      +
    412A  ALA*     3.1    12.0    +      -       -      +
    413A  ILE*     3.3    21.2    +      -       +      +
    525A  VAL*     5.9     0.2    -      -       +      -
    529A  ILE*     3.8    21.3    -      -       +      -
    533A  PHE*     3.7    26.5    -      +       -      -
    565A  ALA*     5.7     1.3    -      -       +      -
    574A  TRP*     3.9    18.4    -      +       +      -
    577A  ALA*     3.5    24.7    -      -       +      -
    578A  MET*     3.8    31.9    -      -       +      -
    581A  ILE*     4.4     6.3    -      -       +      -
    587A  MET*     6.3     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 410 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    383A  HIS      5.4     0.7    -      -       -      +
    386A  GLY      4.9     0.3    -      -       -      -
    387A  HIS*     2.9    53.2    +      +       +      +
    390A  TYR*     3.4    35.3    -      +       +      +
    391A  PHE*     3.5    23.2    -      +       -      -
    394A  TYR*     3.0    22.3    +      -       -      -
    403A  GLU*     4.6     6.7    +      -       -      -
    404A  GLY*     3.5    27.8    -      -       -      -
    406A  ASN      3.6     4.4    +      -       -      +
    407A  PRO*     3.3    14.0    +      -       +      +
    408A  GLY      3.3     0.4    -      -       -      -
    409A  PHE*     1.3    80.2    -      -       -      +
    411A  GLU*     1.3    62.6    +      -       -      +
    413A  ILE*     4.1    10.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 411 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    383A  HIS*     2.9    29.2    +      -       +      +
    387A  HIS*     3.3    11.6    -      -       -      -
    407A  PRO      3.4    13.8    -      -       -      +
    408A  GLY      3.2     7.8    +      -       -      +
    409A  PHE      3.1     0.4    -      -       -      -
    410A  HIS*     1.3    79.9    -      -       -      +
    412A  ALA*     1.3    59.7    +      -       -      +
    413A  ILE      3.6     0.4    +      -       -      -
    414A  GLY      4.5     1.6    +      -       -      -
    415A  ASP*     3.8     5.9    +      -       -      +
    522A  ARG*     3.8    35.6    +      -       +      +
    523A  TYR*     3.2    17.8    +      -       +      -
    526A  SER*     3.4    19.7    +      -       -      +
    701A   ZN      2.0    38.2    -      -       -      -
    702A  LPR      3.1     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 412 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    408A  GLY      3.0    15.0    +      -       -      +
    409A  PHE      3.1     4.4    +      -       -      +
    411A  GLU*     1.3    77.4    -      -       -      +
    413A  ILE*     1.3    65.8    +      -       -      +
    414A  GLY      3.5     0.2    -      -       -      -
    415A  ASP*     3.1     5.4    +      -       -      +
    416A  VAL*     3.0    26.7    +      -       -      +
    526A  SER*     3.3    12.3    +      -       -      +
    529A  ILE*     3.9    24.2    -      -       +      -
    530A  GLN*     4.1    11.8    -      -       +      +
    533A  PHE*     4.1    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 413 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  PHE*     4.1    14.4    -      -       +      -
    386A  GLY*     3.9    23.8    -      -       -      +
    389A  GLN*     4.9     0.2    -      -       +      -
    390A  TYR*     3.6    22.7    -      -       +      -
    409A  PHE*     3.3    19.1    -      -       +      +
    410A  HIS      4.3     2.2    -      -       -      +
    411A  GLU      3.6     1.0    -      -       -      -
    412A  ALA*     1.3    75.7    -      -       -      +
    414A  GLY*     1.3    65.0    +      -       -      +
    416A  VAL*     3.2    17.4    +      -       -      +
    417A  LEU*     3.6     9.4    +      -       -      +
    533A  PHE*     4.9    11.9    -      -       +      -
    562A  LEU*     4.2    26.7    -      -       +      -
    566A  MET*     4.0    32.3    -      -       +      -
    581A  ILE*     5.7     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 414 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  PHE*     4.4     5.8    -      -       -      -
    382A  HIS*     3.2    29.7    -      -       -      +
    383A  HIS*     3.9     8.5    +      -       -      -
    386A  GLY*     3.6    12.6    -      -       -      -
    410A  HIS      5.2     0.6    +      -       -      -
    411A  GLU      4.5     2.2    +      -       -      -
    412A  ALA      3.5     0.6    -      -       -      -
    413A  ILE*     1.3    79.6    -      -       -      +
    415A  ASP*     1.3    63.8    +      -       -      +
    417A  LEU*     3.3     5.9    +      -       -      +
    418A  ALA*     3.0    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 415 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    379A  VAL*     5.3     1.7    -      -       -      +
    383A  HIS*     2.7    36.8    +      -       -      +
    411A  GLU      3.9     5.4    +      -       -      -
    412A  ALA      3.1     7.3    +      -       -      +
    414A  GLY*     1.3    72.5    -      -       -      +
    416A  VAL*     1.3    66.6    +      -       -      +
    418A  ALA*     3.2     8.4    +      -       -      +
    419A  LEU*     2.9    27.7    +      -       -      +
    454A  LYS*     3.5    11.0    +      -       -      +
    526A  SER*     4.3     1.0    +      -       -      -
    527A  PHE*     3.7     8.3    -      -       -      -
    530A  GLN*     3.0    36.2    +      -       -      +
   2000A  GLY*     3.5    22.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 416 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  ALA      3.0    24.1    +      -       -      +
    413A  ILE*     3.2     9.2    +      -       -      +
    415A  ASP*     1.3    75.8    -      -       -      +
    417A  LEU*     1.3    69.6    +      -       +      +
    419A  LEU*     3.2    25.5    +      -       -      +
    420A  SER*     3.7     4.3    +      -       -      -
    530A  GLN*     3.8    12.8    -      -       +      +
    533A  PHE*     3.8    28.5    -      -       +      -
    534A  HIS*     4.4    20.4    +      -       -      +
    537A  LEU*     3.7    29.2    -      -       +      -
    552A  ILE*     4.6     6.5    -      -       +      +
    562A  LEU*     5.0     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 417 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  PHE*     3.5    43.7    -      -       +      -
    323A  PHE*     3.6    51.1    -      -       +      +
    326A  LEU*     3.9    18.6    -      -       +      -
    382A  HIS*     4.6     7.0    -      -       +      -
    413A  ILE      3.7    12.6    -      -       -      +
    414A  GLY      3.3     7.5    +      -       -      +
    415A  ASP      3.3     0.4    -      -       -      -
    416A  VAL*     1.3    83.3    -      -       +      +
    418A  ALA*     1.3    63.3    +      -       -      +
    420A  SER*     3.0    17.4    +      -       -      -
    421A  VAL*     3.1    15.0    +      -       -      +
    552A  ILE*     4.6     3.6    -      -       +      -
    562A  LEU*     4.2    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 418 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    379A  VAL*     3.9    31.2    -      -       +      +
    382A  HIS*     4.0    15.6    -      -       +      +
    414A  GLY      3.0    14.1    +      -       -      +
    415A  ASP*     3.2    11.4    +      -       -      +
    417A  LEU*     1.3    76.9    -      -       -      +
    419A  LEU*     1.3    62.0    +      -       -      +
    421A  VAL*     3.5    12.5    -      -       +      +
    422A  SER*     2.9    30.1    +      -       -      +
    454A  LYS*     6.1     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 419 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    415A  ASP      2.9    18.4    +      -       -      +
    416A  VAL*     3.2    12.1    -      -       -      +
    417A  LEU      3.1     0.4    -      -       -      -
    418A  ALA*     1.3    78.9    -      -       -      +
    420A  SER*     1.3    61.1    +      -       -      +
    422A  SER*     3.4    14.8    +      -       -      -
    423A  THR*     3.7    11.0    +      -       -      +
    446A  PHE*     5.1     1.4    -      -       -      -
    450A  MET*     3.7    27.9    -      -       +      +
    454A  LYS*     4.0    12.1    -      -       -      -
    530A  GLN*     4.0    20.0    -      -       -      +
    531A  PHE*     4.0    31.0    -      -       +      -
    534A  HIS*     3.7    42.3    -      -       +      +
    595A  TYR*     4.7     6.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 420 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  PHE*     3.6    12.3    -      -       -      -
    416A  VAL      3.7     1.5    +      -       -      -
    417A  LEU      3.0     9.9    +      -       -      -
    419A  LEU*     1.3    78.4    -      -       -      +
    421A  VAL*     1.3    61.5    +      -       -      +
    423A  THR*     2.6    27.7    +      -       -      -
    426A  HIS*     3.3     7.2    +      -       -      +
    534A  HIS*     3.9    10.3    +      -       -      -
    550A  CYS      3.9    11.7    +      -       -      -
    551A  ASP*     3.5    22.8    -      -       -      -
    552A  ILE*     3.0    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 421 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  PHE*     3.5    25.4    -      -       +      -
    375A  LEU*     6.0     2.0    -      -       +      -
    378A  LEU*     4.5    17.0    -      -       +      -
    379A  VAL*     6.3     2.9    -      -       +      -
    382A  HIS*     3.5    33.4    -      -       +      +
    417A  LEU      3.1    14.2    +      -       -      +
    418A  ALA*     3.2     9.6    +      -       -      +
    420A  SER*     1.3    75.7    -      -       -      +
    422A  SER*     1.3    61.9    +      -       -      +
    423A  THR      3.3     1.0    +      -       -      -
    426A  HIS*     3.4    33.9    -      -       +      +
    427A  LEU*     3.5    13.8    -      -       +      +
    430A  LEU*     4.5     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 422 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    375A  LEU*     4.9     6.8    -      -       -      +
    379A  VAL*     4.3    17.2    -      -       -      +
    418A  ALA*     2.9    18.6    +      -       -      +
    419A  LEU*     3.7     6.9    -      -       -      -
    420A  SER      3.2     0.4    -      -       -      -
    421A  VAL*     1.3    76.6    -      -       -      +
    423A  THR*     1.3    65.9    +      -       -      +
    424A  PRO      3.4     0.7    -      -       -      -
    427A  LEU*     3.5    20.6    -      -       -      +
    446A  PHE*     3.4    12.8    -      -       -      -
    449A  LYS*     5.4     2.7    -      -       -      -
    450A  MET*     3.9    28.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 423 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    419A  LEU      3.8     9.2    -      -       -      +
    420A  SER      2.6    21.5    +      -       -      +
    422A  SER*     1.3    78.1    -      -       -      +
    424A  PRO*     1.3    75.1    -      -       -      +
    425A  LYS*     4.3     4.6    -      -       -      +
    426A  HIS*     2.9    17.1    +      -       -      +
    427A  LEU*     2.9    19.9    +      -       -      +
    446A  PHE*     3.8     6.7    -      -       +      -
    548A  HIS      3.7    18.8    -      -       -      +
    549A  LYS*     4.7     5.4    -      -       -      -
    550A  CYS      3.5    25.8    -      -       -      +
    551A  ASP*     4.1     7.2    +      -       -      +
    595A  TYR*     5.8     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 424 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    422A  SER      3.4     0.6    -      -       -      +
    423A  THR*     1.3    85.4    -      -       -      +
    425A  LYS*     1.3    58.1    +      -       -      +
    427A  LEU*     3.3     2.8    +      -       -      +
    428A  HIS*     2.9    29.3    +      -       -      +
    433A  LEU*     3.6    24.5    -      -       +      +
    442A  HIS*     5.5     2.2    -      -       +      +
    446A  PHE*     3.5    44.6    -      -       +      -
    548A  HIS      5.7     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 425 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423A  THR*     3.2     5.3    -      -       -      +
    424A  PRO*     1.3    80.2    -      -       -      +
    426A  HIS*     1.3    62.3    +      -       -      +
    428A  HIS*     3.3    10.3    +      -       +      +
    429A  SER*     3.1    21.4    +      -       -      -
    551A  ASP*     5.9     2.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 426 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  PHE*     3.7    26.5    -      +       -      -
    420A  SER      3.3     8.7    +      -       -      +
    421A  VAL*     3.4    34.1    -      -       +      +
    423A  THR*     2.9    22.2    +      -       -      +
    425A  LYS*     1.3    76.0    -      -       -      +
    427A  LEU*     1.3    67.9    +      -       -      +
    429A  SER*     2.5    32.6    +      -       -      -
    430A  LEU*     3.2    21.7    +      -       +      +
    551A  ASP*     2.9    25.8    +      -       -      +
    553A  TYR*     4.1    17.3    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 427 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301A  THR*     4.9     3.8    -      -       +      +
    375A  LEU*     4.3    31.6    -      -       +      -
    378A  LEU*     5.2     1.8    -      -       +      -
    421A  VAL*     3.5    25.8    -      -       +      +
    422A  SER*     3.5    19.7    -      -       -      +
    423A  THR      2.9     8.7    +      -       -      +
    424A  PRO      3.6     7.2    -      -       -      +
    426A  HIS*     1.3    75.8    -      -       -      +
    428A  HIS*     1.3    61.0    +      -       -      +
    430A  LEU*     3.0    19.3    +      -       +      +
    432A  LEU*     2.9    46.3    +      -       +      +
    433A  LEU*     3.6    31.0    -      -       +      -
    449A  LYS*     4.5     8.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 428 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    424A  PRO      2.9    14.1    +      -       -      +
    425A  LYS*     3.5    13.7    +      -       +      +
    426A  HIS      3.1     0.2    -      -       -      -
    427A  LEU*     1.3    76.9    -      -       -      +
    429A  SER*     1.3    60.5    +      -       -      +
    431A  ASN*     2.8    22.0    +      -       -      +
    433A  LEU*     2.8    34.9    -      -       +      +
    434A  SER*     3.1    27.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 429 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    425A  LYS*     3.1    12.2    +      -       -      -
    426A  HIS*     2.5    34.8    +      -       -      -
    428A  HIS*     1.3    79.5    +      -       -      +
    430A  LEU*     1.3    63.4    +      -       -      +
    431A  ASN*     3.2     1.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 430 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308A  GLN*     4.4     0.7    -      -       -      +
    310A  TRP*     3.9    35.0    +      -       +      -
    314A  ARG*     4.9     3.6    +      -       -      +
    318A  GLU*     3.8    28.0    -      -       +      +
    378A  LEU*     4.6     5.8    -      -       +      -
    421A  VAL*     4.5    13.5    -      -       +      -
    426A  HIS*     3.7    32.3    -      -       +      +
    427A  LEU*     3.0    14.2    +      -       +      +
    429A  SER*     1.3    84.3    +      -       -      +
    431A  ASN*     1.3    70.5    +      -       -      +
    432A  LEU*     3.8    24.3    -      -       +      +
----------------------------------------------------------
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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