Contacts of the helix formed by residues 448 - 471 (chain A) in PDB entry 6T2C


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 448 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  ALA      3.5    17.0    -      -       -      -
    410A  SER*     3.9    14.1    -      -       -      -
    411A  GLU      3.5     9.0    -      -       -      +
    412A  LEU*     4.2     3.6    -      -       -      +
    413A  THR*     4.0     1.3    -      -       -      -
    417A  TRP*     3.4    17.7    -      -       -      -
    445A  VAL      3.8    13.2    -      -       -      +
    446A  SER      3.1     2.8    +      -       -      -
    447A  GLN*     1.3    82.7    -      -       -      +
    449A  ARG*     1.3    80.9    +      -       -      +
    450A  ALA*     3.1    22.8    +      -       -      -
    451A  SER*     3.5     8.2    +      -       -      +
    633A  ARG*     3.9    29.6    -      -       +      -
    636A  LEU*     5.0     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 449 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284A  LEU      4.6     2.8    +      -       -      -
    285A  MET*     4.3    26.5    +      -       -      +
    287A  ALA      5.9     1.0    +      -       -      -
    408A  LYS*     3.6    43.1    +      -       -      +
    409A  ALA*     4.3     7.2    -      -       -      -
    411A  GLU*     3.4    14.6    +      -       -      +
    413A  THR*     3.7    28.5    -      -       +      +
    448A  CYS*     1.3    76.4    -      -       -      +
    450A  ALA*     1.3    61.0    +      -       -      +
    452A  GLU*     3.0    26.4    +      -       -      +
    453A  TYR*     3.0    43.2    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 450 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  ALA*     3.8    12.8    +      -       +      +
    448A  CYS*     3.1    16.4    -      -       -      -
    449A  ARG*     1.3    78.2    -      -       -      +
    451A  SER*     1.3    56.7    +      -       -      +
    453A  TYR*     3.3    14.3    +      -       +      +
    454A  ILE*     2.9    32.4    +      -       -      +
    636A  LEU*     3.8    17.7    -      -       +      -
    637A  ALA*     4.1    12.1    -      -       -      -
    640A  VAL*     3.9    16.7    -      -       +      +
    641A  PHE*     6.4     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 451 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  TRP*     3.8    13.2    -      -       -      +
    418A  ILE*     4.7    13.2    -      -       -      +
    445A  VAL      3.2    23.9    +      -       -      -
    446A  SER*     3.3    19.7    +      -       -      -
    448A  CYS      3.5     4.4    +      -       -      -
    449A  ARG      3.2     0.4    -      -       -      -
    450A  ALA*     1.3    76.2    -      -       -      +
    452A  GLU*     1.3    59.6    +      -       -      +
    454A  ILE*     3.3    13.8    +      -       -      +
    455A  MET*     3.0    30.8    +      -       -      +
    580A  LEU*     4.9     3.9    -      -       -      +
    636A  LEU*     3.8     9.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 452 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289A  LYS*     3.8    12.5    +      -       -      -
    413A  THR*     5.7     1.0    -      -       -      +
    417A  TRP*     3.4    49.8    -      -       +      +
    448A  CYS      3.8     1.6    +      -       -      -
    449A  ARG*     3.0    31.7    +      -       -      +
    451A  SER*     1.3    79.3    -      -       -      +
    453A  TYR*     1.3    69.5    +      -       +      +
    455A  MET*     3.4     2.4    +      -       -      +
    456A  LYS*     2.9    31.8    +      -       -      +
    482A  THR*     4.6     2.1    -      -       +      +
    496A  TYR*     2.4    38.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 453 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     4.2     5.7    -      +       +      -
    284A  LEU*     2.7    61.9    +      -       +      +
    285A  MET*     3.7     7.8    +      -       -      +
    405A  GLU*     5.0     1.6    +      -       -      -
    408A  LYS      5.0     1.2    +      -       -      -
    409A  ALA*     4.0    25.5    +      -       +      +
    449A  ARG*     3.0    34.7    +      -       +      +
    450A  ALA*     3.3    12.8    +      -       -      +
    452A  GLU*     1.3    88.5    -      -       -      +
    454A  ILE*     1.3    60.8    +      -       -      +
    456A  LYS*     3.9    17.1    -      -       -      +
    457A  ALA*     2.9    31.4    +      -       -      +
    576A  MET*     4.4     2.6    -      -       -      +
    640A  VAL*     4.2    14.1    -      -       +      -
    641A  PHE*     4.2    15.3    -      +       -      -
    644A  ILE*     4.6     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 454 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  ILE*     6.1     1.8    -      -       +      -
    450A  ALA      2.9    18.3    +      -       -      +
    451A  SER*     3.5    14.4    -      -       -      +
    453A  TYR*     1.3    76.8    -      -       -      +
    455A  MET*     1.3    61.4    +      -       +      +
    457A  ALA*     3.3     1.7    +      -       -      +
    458A  VAL*     3.0    30.5    +      -       +      +
    576A  MET*     4.1    26.2    -      -       +      +
    577A  ARG*     4.2    33.9    -      -       +      +
    579A  CYS*     4.2     5.6    -      -       +      -
    580A  LEU*     3.9    31.0    -      -       +      -
    636A  LEU*     4.4     6.1    -      -       +      -
    640A  VAL*     3.7    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 455 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  TRP*     3.4    37.0    -      -       +      +
    418A  ILE*     4.9    11.9    -      -       +      -
    419A  GLU      5.3     1.1    -      -       -      +
    451A  SER      3.0    15.9    +      -       -      +
    452A  GLU*     3.9     5.4    -      -       -      +
    453A  TYR      3.4     0.2    -      -       -      -
    454A  ILE*     1.3    79.2    -      -       +      +
    456A  LYS*     1.3    62.9    +      -       -      +
    458A  VAL*     3.4     4.8    +      -       +      +
    459A  TYR*     3.0    47.7    +      -       +      +
    482A  THR*     4.3     9.0    -      -       +      -
    483A  LYS      3.6    28.3    -      -       -      +
    577A  ARG*     4.9    11.9    -      -       -      +
    553B  LYS*     6.3     1.6    -      -       -      -
     33V    C      4.4    17.0    -      -       -      +
     34V    U      4.0    14.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 456 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     3.7    32.0    -      -       +      +
    283A  LEU      3.4    24.0    +      -       -      -
    284A  LEU      4.9     0.6    +      -       -      -
    287A  ALA*     4.1     4.9    -      -       -      +
    452A  GLU*     2.9    20.5    +      -       -      +
    453A  TYR*     3.9    18.4    -      -       -      +
    455A  MET*     1.3    77.4    -      -       -      +
    457A  ALA*     1.3    56.4    +      -       -      +
    459A  TYR*     3.4     3.4    +      -       -      +
    460A  ILE*     3.0    36.9    +      -       +      +
    480A  ILE*     3.9    22.4    -      -       +      -
    481A  ILE      5.2     0.2    -      -       -      -
    482A  THR*     3.8    16.3    -      -       +      +
    496A  TYR*     3.8    41.4    -      -       +      +
    519A  GLU*     5.1     1.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 457 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  PHE*     3.7    23.1    -      -       +      -
    453A  TYR      2.9    18.1    +      -       -      +
    454A  ILE      3.8     0.9    -      -       -      +
    456A  LYS*     1.3    73.8    -      -       -      +
    458A  VAL*     1.3    64.7    +      -       -      +
    460A  ILE*     4.6     0.9    -      -       -      +
    461A  ASN*     2.4    42.1    +      -       -      +
    573A  GLY      3.8     1.8    -      -       -      +
    576A  MET*     3.7    32.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 458 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  ILE*     3.0    21.9    +      -       +      +
    455A  MET*     3.7     5.6    -      -       -      +
    456A  LYS      3.3     0.2    -      -       -      -
    457A  ALA*     1.3    76.5    -      -       -      +
    459A  TYR*     1.3    67.8    +      -       +      +
    461A  ASN*     4.2     0.5    -      -       -      +
    462A  THR*     3.0    36.1    +      -       -      +
    573A  GLY      3.9     9.2    -      -       -      +
    574A  MET*     3.6    20.9    -      -       -      +
    576A  MET*     4.3    11.0    -      -       +      +
    577A  ARG*     4.4    28.9    -      -       +      +
     33V    C      3.9    33.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 459 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    455A  MET*     3.0    42.8    +      -       +      +
    456A  LYS      3.9     2.7    -      -       -      +
    458A  VAL*     1.3    85.8    -      -       +      +
    460A  ILE*     1.3    62.3    +      -       +      +
    462A  THR*     3.9     4.8    -      -       -      +
    463A  ALA*     3.0    26.7    +      -       -      +
    480A  ILE*     6.4     0.2    -      -       -      -
    481A  ILE*     3.2    36.6    -      -       +      +
    482A  THR*     4.8     1.1    -      -       -      -
    483A  LYS*     4.3    24.0    -      -       +      +
    577A  ARG*     5.3     0.4    -      -       -      -
     33V    C      3.3    72.0    +      +       +      +
     34V    U      3.9     9.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 460 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281A  LYS*     5.4     6.5    -      -       +      +
    282A  PHE*     3.6    33.7    -      -       +      -
    456A  LYS*     3.0    21.2    +      -       +      +
    457A  ALA*     4.0     4.5    -      -       -      +
    459A  TYR*     1.3    78.2    -      -       +      +
    461A  ASN*     1.3    66.4    +      -       -      +
    463A  ALA*     3.8     4.1    -      -       -      +
    464A  LEU*     2.9    36.5    +      -       +      +
    478A  ILE*     5.3     3.0    -      -       +      +
    479A  PRO      5.4     2.2    -      -       -      +
    480A  ILE*     3.7    49.8    -      -       +      -
    499A  ILE*     3.8    21.1    -      -       +      -
    515A  PHE*     6.4     1.3    -      -       +      -
    519A  GLU*     5.0     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 461 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281A  LYS*     5.7     5.2    -      -       -      +
    282A  PHE*     5.6     1.2    -      -       -      -
    457A  ALA*     2.4    37.4    +      -       -      +
    460A  ILE*     1.3    83.9    -      -       -      +
    462A  THR*     1.3    57.5    +      -       -      +
    464A  LEU*     3.8     8.6    -      -       -      +
    465A  LEU*     3.0    31.2    +      -       -      +
    565A  THR*     5.4     1.7    +      -       -      -
    569A  LYS      4.5     1.4    -      -       -      +
    570A  MET*     3.5    35.7    -      -       -      +
    573A  GLY*     3.0    27.5    +      -       -      -
    574A  MET*     3.8     9.7    -      -       -      +
    576A  MET*     5.3     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 462 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    458A  VAL      3.0    19.9    +      -       -      -
    459A  TYR*     3.9     4.5    -      -       -      +
    461A  ASN*     1.3    75.7    -      -       -      +
    463A  ALA*     1.3    58.3    +      -       +      +
    465A  LEU*     3.4     2.4    +      -       -      +
    466A  ASN*     3.0    37.1    +      -       -      +
    574A  MET*     3.5    19.2    -      -       +      +
    557B  TYR*     3.3    26.2    -      -       -      +
     32V    G      4.3     5.2    -      -       -      +
     33V    C      2.9    35.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 463 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    459A  TYR      3.0    18.8    +      -       -      +
    460A  ILE*     3.9     2.5    -      -       -      +
    462A  THR*     1.3    78.2    -      -       -      +
    464A  LEU*     1.3    57.6    +      -       -      +
    466A  ASN*     3.4     7.0    +      -       -      +
    467A  SER*     3.0    33.3    +      -       -      -
    478A  ILE*     3.7    26.2    -      -       +      +
    479A  PRO      5.2     2.9    -      -       -      +
     31V    U      4.6     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 464 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    460A  ILE*     2.9    28.8    +      -       +      +
    461A  ASN*     3.8     7.0    -      -       -      +
    463A  ALA*     1.3    78.7    -      -       -      +
    465A  LEU*     1.3    56.3    +      -       -      +
    467A  SER      3.6     0.5    +      -       -      -
    468A  SER*     2.9    34.3    +      -       -      +
    478A  ILE*     3.9    14.8    -      -       +      +
    499A  ILE*     4.9    10.5    -      -       +      -
    501A  LYS*     3.7    28.7    -      -       +      -
    513A  VAL*     5.0     7.6    -      -       +      -
    515A  PHE*     4.2    23.6    -      -       +      -
    565A  THR*     4.1    23.8    -      -       +      -
    570A  MET*     3.7    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 465 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  ASN      3.0    15.3    +      -       -      +
    462A  THR      3.9     2.9    -      -       -      +
    464A  LEU*     1.3    74.5    -      -       -      +
    466A  ASN*     1.3    62.9    +      -       -      +
    468A  SER*     4.3     3.1    -      -       -      -
    469A  CYS*     2.9    50.1    +      -       -      +
    506A  LEU*     5.9     1.6    -      -       +      -
    567A  LYS*     4.9     8.3    -      -       +      +
    570A  MET*     3.9    34.7    -      -       +      -
    571A  LYS      4.5     3.8    -      -       -      +
    574A  MET*     3.7    27.1    -      -       -      -
     45C  LEU*     3.8    33.4    -      -       +      -
     49C  TRP*     5.4     1.5    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    462A  THR*     3.0    23.2    +      -       -      +
    463A  ALA*     3.9     5.7    -      -       -      +
    464A  LEU      3.3     0.2    -      -       -      -
    465A  LEU*     1.3    79.7    -      -       -      +
    467A  SER*     1.3    58.2    +      -       -      +
    469A  CYS*     5.2     2.0    -      -       -      -
    470A  THR*     2.9    37.4    +      -       -      +
    557B  TYR*     3.7    13.4    +      -       -      -
    560B  ARG*     4.8     1.3    +      -       -      +
     48C  LYS      4.5     8.0    -      -       -      +
     49C  TRP*     4.8     6.3    -      -       -      +
     52C  ALA*     4.4    13.2    -      -       -      +
     31V    U      3.6    35.2    +      -       -      +
     32V    G      3.5    23.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 467 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463A  ALA      3.0    16.8    +      -       -      -
    464A  LEU      4.2     0.7    -      -       -      -
    466A  ASN*     1.3    75.3    -      -       -      +
    468A  SER*     1.3    56.5    +      -       -      +
    470A  THR      4.6     0.2    -      -       -      +
    471A  ALA*     2.9    17.5    +      -       -      +
    476A  GLN*     3.0    30.3    +      -       -      +
    478A  ILE*     3.9    15.3    -      -       -      +
    501A  LYS*     2.5    39.5    +      -       -      -
     31V    U      3.4    16.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 468 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    464A  LEU*     2.9    20.0    +      -       -      +
    465A  LEU*     3.8    10.1    -      -       -      -
    466A  ASN      3.2     0.2    -      -       -      -
    467A  SER*     1.3    79.0    -      -       -      +
    469A  CYS*     1.3    63.3    +      -       -      +
    470A  THR      3.6     0.2    +      -       -      -
    472A  MET*     3.4    21.1    -      -       -      +
    501A  LYS*     3.8    10.0    -      -       -      +
    504A  SER*     3.2    38.3    +      -       -      +
    506A  LEU*     4.8     5.8    -      -       -      +
    513A  VAL*     4.4    11.6    -      -       -      +
    570A  MET*     4.6     9.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 469 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    465A  LEU*     2.9    37.8    +      -       -      +
    466A  ASN      4.5     1.1    -      -       -      +
    468A  SER*     1.3    78.4    -      -       -      +
    470A  THR*     1.3    61.3    +      -       -      +
    472A  MET*     5.1    11.2    -      -       -      +
    506A  LEU*     6.4     1.3    -      -       -      -
    567A  LYS*     5.7     8.1    -      -       -      -
     49C  TRP*     3.7    61.3    -      -       +      -
     53C  MET*     4.6     2.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 470 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466A  ASN*     2.9    23.0    +      -       -      -
    469A  CYS*     1.3    80.7    +      -       -      +
    471A  ALA*     1.3    61.0    +      -       +      +
    472A  MET*     3.8     5.4    +      -       -      +
     49C  TRP*     5.3     5.0    +      -       -      +
     52C  ALA*     5.0     8.3    -      -       -      +
     53C  MET*     5.0    12.1    -      -       +      +
     30V    C      4.0    47.2    +      -       +      +
     31V    U      3.6    35.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 471 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354A  ASN*     5.4     1.8    -      -       -      +
    467A  SER      3.3     7.5    +      -       -      +
    470A  THR*     1.3    78.6    -      -       +      +
    472A  MET*     1.3    51.7    +      -       -      +
    473A  GLU      3.3     8.3    +      -       -      -
    474A  GLU*     3.7    18.9    +      -       -      +
    476A  GLN*     3.7    25.9    +      -       -      +
    501A  LYS*     2.5    30.0    +      -       -      -
     31V    U      4.2     9.0    -      -       +      +
----------------------------------------------------------
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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) +   -    +    +   +   +    +    -
------------------------------------------------------------
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