Contacts of the helix formed by residues 450 - 477 (chain A) in PDB entry 1HKC


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 GLY 450 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  ALA*     3.9     8.6    -      -       -      +
     84A  ASP*     5.3     1.2    +      -       -      -
     93A  LEU*     3.4    36.8    -      -       -      -
     95A  VAL*     3.6    17.6    -      -       -      +
    447A  SER*     3.6     9.3    +      -       -      -
    448A  GLY      3.4     0.6    -      -       -      -
    449A  SER*     1.3    82.3    -      -       -      +
    451A  LYS*     1.3    60.9    +      -       -      +
    452A  GLY      3.4     0.3    +      -       -      -
    453A  ALA      3.8     0.3    +      -       -      -
    454A  ALA*     3.7    10.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 451 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  VAL*     4.2    15.0    -      -       +      -
     97A  VAL*     5.1     3.6    -      -       +      -
    105A  VAL*     4.9    17.7    -      -       +      -
    107A  MET*     3.4    29.7    -      -       +      +
    216A  THR*     3.4    30.3    +      -       +      +
    219A  TYR*     3.7    25.8    -      -       +      -
    220A  ASP*     3.6    30.5    +      -       -      -
    446A  GLU*     5.8     3.4    +      -       -      -
    447A  SER*     4.7     1.0    -      -       -      -
    448A  GLY      4.7     0.6    -      -       -      -
    450A  GLY*     1.3    73.5    -      -       -      +
    452A  GLY*     1.3    63.6    +      -       -      +
    454A  ALA*     3.3     7.7    -      -       -      +
    455A  MET*     3.2    32.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 452 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  VAL*     5.4     0.2    -      -       -      -
    212A  GLY*     3.4    20.0    -      -       -      -
    215A  MET*     3.9    15.3    -      -       -      +
    216A  THR*     2.6    23.2    +      -       -      -
    449A  SER      3.7     1.6    -      -       -      -
    450A  GLY      3.2     1.0    -      -       -      -
    451A  LYS*     1.3    71.7    -      -       -      +
    453A  ALA*     1.3    66.4    +      -       -      +
    454A  ALA      2.9     1.6    -      -       -      -
    455A  MET*     2.9    15.6    +      -       -      +
    456A  VAL*     3.2    11.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 453 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  ALA*     4.5    13.5    -      -       +      -
    151A  GLY*     4.5     2.2    -      -       -      -
    152A  PHE      4.5    15.0    -      -       -      +
    153A  THR*     3.4    24.9    -      -       -      +
    205A  ALA*     5.4     0.5    -      -       -      +
    207A  VAL*     4.1    16.4    -      -       +      -
    212A  GLY*     4.5     3.6    -      -       -      -
    449A  SER      3.3    10.3    +      -       -      +
    450A  GLY      4.3     2.7    -      -       -      +
    451A  LYS      3.6     0.2    -      -       -      -
    452A  GLY*     1.3    74.2    -      -       -      +
    454A  ALA*     1.3    55.9    +      -       -      +
    456A  VAL*     3.5     4.4    +      -       -      +
    457A  THR*     2.8    34.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 454 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  PHE*     3.7    20.5    -      -       +      -
     81A  ILE      5.6     3.6    -      -       -      +
     82A  ALA*     5.2     3.3    -      -       +      +
     95A  VAL*     3.8    34.3    -      -       +      -
     97A  VAL*     4.9     2.5    -      -       +      -
    450A  GLY      3.7     7.4    +      -       -      +
    451A  LYS      3.3    11.4    -      -       -      +
    452A  GLY      2.9     0.4    -      -       -      -
    453A  ALA*     1.3    77.9    -      -       -      +
    455A  MET*     1.3    61.6    +      -       -      +
    457A  THR*     3.4     5.8    +      -       -      -
    458A  ALA*     2.9    28.8    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     72A  PRO*     3.5    29.4    -      -       +      -
     76A  GLU*     3.4    30.9    -      -       +      +
     97A  VAL*     3.4    37.2    -      -       +      -
    215A  MET*     4.6    10.4    -      -       +      +
    219A  TYR*     3.2    35.2    -      -       +      -
    451A  LYS*     3.2    22.9    -      -       +      +
    452A  GLY*     2.9     9.0    +      -       -      +
    454A  ALA*     1.3    75.0    -      -       -      +
    456A  VAL*     1.3    65.1    +      -       -      +
    458A  ALA*     3.4     6.0    -      -       +      +
    459A  VAL*     3.2    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 456 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  VAL*     3.8    19.3    -      -       +      -
    163A  ILE*     3.7    16.4    -      -       +      -
    205A  ALA*     3.7    15.7    -      -       +      -
    207A  VAL*     3.6    29.6    -      -       +      -
    211A  VAL*     4.7     1.3    -      -       +      -
    215A  MET*     3.5    35.4    -      -       +      -
    452A  GLY      3.2     5.6    +      -       -      +
    453A  ALA      3.9     5.4    -      -       -      +
    455A  MET*     1.3    75.2    -      -       -      +
    457A  THR*     1.3    68.2    +      -       -      +
    459A  VAL*     3.3     7.7    +      -       -      +
    460A  ALA*     3.0    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 457 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  PHE*     3.4    28.7    -      -       +      -
     81A  ILE      5.5     0.2    -      -       -      -
    149A  PRO*     3.6    13.7    -      -       +      -
    150A  VAL      4.6     0.2    -      -       -      -
    151A  GLY*     3.1    24.8    -      -       -      -
    204A  VAL*     3.2    29.1    -      -       +      +
    205A  ALA*     4.2     3.6    -      -       -      +
    453A  ALA      2.8    22.2    +      -       -      -
    454A  ALA*     3.6     7.0    -      -       -      -
    456A  VAL*     1.3    78.6    -      -       -      +
    458A  ALA*     1.3    64.8    +      -       -      +
    460A  ALA*     2.9     6.4    +      -       -      +
    461A  TYR*     2.8    21.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 458 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  GLU*     4.3    19.5    -      -       +      -
     77A  LYS      4.9     7.0    -      -       -      +
     80A  PHE*     3.5    26.5    -      -       +      -
    454A  ALA      2.9    18.3    +      -       -      +
    455A  MET*     3.4    12.1    -      -       +      +
    457A  THR*     1.3    76.9    -      -       -      +
    459A  VAL*     1.3    62.3    +      -       -      +
    461A  TYR*     3.3     4.3    +      -       -      +
    462A  ARG*     3.0    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 459 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76A  GLU*     4.4    18.4    -      -       +      +
    215A  MET*     5.9     4.5    -      -       +      -
    455A  MET      3.2    17.0    -      -       -      +
    456A  VAL*     3.3     8.6    +      -       -      +
    458A  ALA*     1.3    70.6    -      -       -      +
    460A  ALA*     1.3    65.2    -      -       -      +
    462A  ARG*     3.0    47.5    +      -       -      +
    463A  LEU*     3.1    21.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 460 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  ILE*     4.2    16.4    -      -       +      -
    204A  VAL*     3.9    28.9    -      -       +      +
    205A  ALA*     4.5     1.8    -      -       +      -
    456A  VAL      3.0    12.2    +      -       -      +
    457A  THR*     2.9    12.6    +      -       -      +
    459A  VAL*     1.3    75.1    -      -       -      +
    461A  TYR*     1.3    64.9    +      -       -      +
    463A  LEU*     3.5     9.0    +      -       -      +
    464A  ALA*     3.1    21.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 461 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  PHE*     5.5     2.9    -      +       +      -
    147A  LYS      5.0     6.7    +      -       -      -
    149A  PRO*     4.1    33.2    -      -       +      -
    202A  ASN*     3.7    19.4    +      -       -      -
    204A  VAL*     4.2    15.6    -      -       +      +
    457A  THR      2.8    11.0    +      -       -      +
    458A  ALA*     3.6     9.9    -      -       -      +
    460A  ALA*     1.3    73.5    -      -       -      +
    462A  ARG*     1.3    70.0    +      -       -      +
    464A  ALA*     2.7    26.3    +      -       +      +
    465A  GLU*     3.0    34.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 462 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  SER*     5.7     5.6    +      -       -      -
    458A  ALA      3.0    11.5    +      -       -      +
    459A  VAL*     3.0    40.8    +      -       -      +
    461A  TYR*     1.3    81.5    -      -       -      +
    463A  LEU*     1.3    96.7    +      -       -      +
    464A  ALA      3.0     0.3    +      -       -      -
    465A  GLU*     3.0    15.7    +      -       -      +
    466A  GLN*     3.2    26.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 463 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    459A  VAL*     3.1    19.1    +      -       +      +
    460A  ALA*     4.0     6.5    -      -       -      +
    462A  ARG*     1.3   118.2    -      -       -      +
    464A  ALA*     1.3    61.1    +      -       -      +
    466A  GLN*     3.8    23.2    -      -       -      +
    467A  HIS*     3.3    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 464 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204A  VAL*     6.1     2.2    -      -       +      -
    460A  ALA      3.1    12.8    +      -       -      +
    461A  TYR*     2.7    30.4    +      -       +      +
    463A  LEU*     1.3    72.5    -      -       -      +
    465A  GLU*     1.3    61.7    +      -       -      +
    467A  HIS*     3.5     6.4    +      -       -      +
    468A  ARG*     3.0    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 465 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  TYR*     3.0    40.9    +      -       +      +
    462A  ARG*     3.0    10.1    +      -       -      +
    464A  ALA*     1.3    83.1    -      -       -      +
    466A  GLN*     1.3    55.9    +      -       +      +
    467A  HIS      3.2     0.2    -      -       -      -
    468A  ARG*     3.1    37.9    +      -       -      +
    469A  GLN*     2.7    46.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 466 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    462A  ARG*     3.2    26.2    +      -       +      +
    463A  LEU*     3.8    27.5    -      -       -      +
    465A  GLU*     1.3    78.1    -      -       +      +
    467A  HIS*     1.3    58.2    +      -       -      +
    469A  GLN*     3.5     8.9    -      -       -      +
    470A  ILE*     2.8    40.8    +      -       +      +
    765A  GLY      3.7    13.5    -      -       -      +
    766A  PHE*     3.8    46.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 467 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463A  LEU      3.3    14.8    +      -       -      +
    464A  ALA*     3.8     6.0    +      -       -      +
    465A  GLU      3.2     0.2    -      -       -      -
    466A  GLN*     1.3    78.1    -      -       -      +
    468A  ARG*     1.3    65.1    +      -       -      +
    470A  ILE*     4.4    11.4    -      -       +      -
    471A  GLU*     3.0    63.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 468 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    464A  ALA      3.0    16.0    +      -       -      +
    465A  GLU*     3.1    39.5    +      -       -      +
    467A  HIS*     1.3    79.6    +      -       -      +
    469A  GLN*     1.3    91.8    +      -       -      +
    471A  GLU*     3.6     5.5    -      -       -      +
    472A  GLU*     2.9    57.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 469 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    465A  GLU*     2.7    32.8    +      -       -      +
    466A  GLN*     3.5     5.7    +      -       -      +
    468A  ARG*     1.3   101.0    +      -       -      +
    470A  ILE*     1.3    59.1    +      -       -      +
    472A  GLU*     2.7    31.2    +      -       -      +
    473A  THR*     3.0    14.8    +      -       -      -
    764A  LYS*     4.8     9.7    -      -       -      +
    766A  PHE*     4.1    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 470 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466A  GLN*     2.8    36.9    +      -       +      +
    467A  HIS*     4.0    11.7    -      -       +      +
    469A  GLN*     1.3    72.2    -      -       -      +
    471A  GLU*     1.3    66.0    +      -       +      +
    473A  THR*     3.4     2.1    +      -       -      -
    474A  LEU*     3.1    36.7    +      -       +      +
    761A  PHE*     3.5    30.3    -      -       +      -
    766A  PHE*     3.5    32.1    -      -       +      -
    818A  LEU*     4.1    34.3    -      -       +      -
    821A  THR*     6.2     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 471 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    467A  HIS*     3.0    58.0    +      -       +      +
    468A  ARG*     3.6     7.2    -      -       -      +
    469A  GLN      2.9     0.2    +      -       -      -
    470A  ILE*     1.3    80.5    -      -       +      +
    472A  GLU*     1.3    61.7    +      -       +      +
    474A  LEU*     3.7    11.6    +      -       -      +
    475A  ALA*     3.2    21.0    +      -       -      +
    821A  THR*     5.8     2.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 472 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  ARG*     2.9    58.3    +      -       -      +
    469A  GLN*     2.7    15.5    +      -       -      +
    471A  GLU*     1.3    72.2    -      -       +      +
    473A  THR*     1.3    65.4    +      -       -      +
    475A  ALA*     3.0    20.6    +      -       -      +
    476A  HIS*     3.9    13.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with THR 473 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    469A  GLN      3.0    11.5    +      -       -      -
    470A  ILE      3.6     7.9    -      -       -      -
    472A  GLU*     1.3    76.7    -      -       -      +
    474A  LEU*     1.3    67.6    +      -       +      +
    475A  ALA      3.3     0.9    +      -       -      -
    476A  HIS*     3.4    28.3    +      -       +      +
    477A  PHE*     4.0     6.1    -      -       +      -
    725A  TYR*     3.4    35.6    +      -       +      +
    757A  ILE*     4.9     0.7    -      -       +      -
    761A  PHE*     3.9    26.2    -      -       +      -
    764A  LYS*     4.4     9.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 474 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470A  ILE*     3.1    32.5    +      -       +      +
    471A  GLU*     4.0    12.3    -      -       -      +
    473A  THR*     1.3    85.1    -      -       +      +
    475A  ALA*     1.3    64.3    +      -       -      +
    476A  HIS      3.2     1.3    -      -       -      -
    477A  PHE*     3.1    28.0    +      -       +      +
    478A  HIS*     3.8     3.1    +      -       -      +
    757A  ILE*     4.4    21.3    -      -       +      -
    761A  PHE*     4.3     9.6    -      -       +      -
    821A  THR*     4.3    16.2    -      -       +      -
    822A  VAL*     4.6    13.0    -      -       +      -
    825A  VAL*     3.7    35.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 475 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    471A  GLU      3.2    12.8    +      -       -      +
    472A  GLU*     3.0    18.7    +      -       -      +
    474A  LEU*     1.3    78.3    -      -       -      +
    476A  HIS*     1.3    58.9    +      -       +      +
    478A  HIS*     2.9    32.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 476 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    472A  GLU      4.0    12.3    +      -       -      -
    473A  THR*     3.4    25.9    -      -       +      +
    474A  LEU      3.2     0.6    -      -       -      -
    475A  ALA*     1.3    81.0    -      -       +      +
    477A  PHE*     1.3    60.2    +      -       +      +
    478A  HIS      3.2     4.6    +      -       -      +
    479A  LEU*     4.5     5.9    -      -       -      +
    483A  MET*     5.9     2.1    -      -       -      +
    721A  ILE      4.9     4.7    -      -       -      +
    723A  THR*     4.0    28.2    -      -       +      +
    725A  TYR*     5.7     4.9    -      +       -      -
    829A  ARG*     5.2     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 477 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    473A  THR      4.0    14.1    -      -       -      -
    474A  LEU*     3.1    15.7    +      -       +      +
    475A  ALA      3.0     0.8    -      -       -      -
    476A  HIS*     1.3    78.6    -      -       +      +
    478A  HIS*     1.3    61.1    +      -       -      +
    479A  LEU*     3.4    13.4    +      -       -      +
    723A  THR*     3.8    20.4    -      -       +      -
    725A  TYR*     3.9    14.8    -      +       -      -
    753A  ILE*     3.8    17.0    -      -       +      -
    757A  ILE*     3.5    31.6    -      -       +      -
    825A  VAL*     3.3    31.7    -      -       +      +
    826A  VAL*     4.2    13.0    -      -       +      -
    828A  ARG*     6.0     1.7    -      -       -      -
    829A  ARG*     3.4    57.9    -      -       -      +
    832A  GLN*     5.4     0.7    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il