Contacts of the helix formed by residues 443 - 474 (chain E) in PDB entry 2BG9


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 443 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309E  ARG*     5.2     6.3    -      -       -      -
    441E  LEU      2.9    12.3    +      -       -      -
    442E  ILE*     1.3    64.4    -      -       -      +
    444E  LYS*     1.3    65.1    +      -       -      +
    445E  VAL      3.3     3.1    -      -       -      -
    446E  ILE*     4.0    12.3    -      -       -      -
    447E  ASP*     2.7    39.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 444 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442E  ILE*     2.6    33.6    +      -       +      +
    443E  GLY*     1.3    71.4    -      -       -      -
    445E  VAL*     1.3    62.3    +      -       +      +
    447E  ASP*     4.0    17.4    +      -       -      +
    448E  LYS*     2.6    47.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 445 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306E  VAL*     4.4    20.6    -      -       +      -
    309E  ARG*     4.2    26.5    -      -       +      +
    443E  GLY      3.3     0.2    -      -       -      -
    444E  LYS*     1.3    83.2    -      -       +      +
    446E  ILE*     1.3    52.8    +      -       -      +
    448E  LYS*     3.6     3.1    -      -       -      +
    449E  ALA*     2.7    36.0    +      -       +      +
    452E  TRP*     4.2     9.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 446 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240E  TYR      4.7     1.1    -      -       -      +
    243E  PRO*     4.5    31.4    -      -       +      -
    244E  ALA*     4.8     8.7    -      -       +      +
    306E  VAL*     4.4    11.7    -      -       +      -
    307E  SER*     5.1    10.5    -      -       -      -
    309E  ARG*     2.9    34.7    -      -       -      +
    443E  GLY*     3.6    11.2    +      -       -      +
    444E  LYS      3.5     0.2    -      -       -      -
    445E  VAL*     1.3    76.4    -      -       -      +
    447E  ASP*     1.3    82.7    +      -       -      +
    449E  ALA*     2.7    18.1    +      -       +      +
    450E  CYS*     3.1    11.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 447 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    244E  ALA*     3.7    23.7    -      -       -      +
    443E  GLY*     2.7    25.4    +      -       -      +
    444E  LYS*     4.0    13.3    +      -       -      +
    446E  ILE*     1.3    82.5    -      -       -      +
    448E  LYS*     1.3    69.1    +      -       +      +
    450E  CYS*     2.9    33.7    +      -       -      +
    451E  PHE*     3.5     3.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 448 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444E  LYS*     2.6    39.3    -      -       +      +
    445E  VAL*     3.8     3.4    -      -       -      +
    446E  ILE      3.1     0.2    -      -       -      -
    447E  ASP*     1.3    83.7    -      -       +      +
    449E  ALA*     1.3    50.9    +      -       -      +
    451E  PHE*     3.2    20.4    +      -       -      +
    452E  TRP*     2.6    68.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 449 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240E  TYR*     5.1     3.6    -      -       +      +
    299E  ASN*     6.0     0.9    -      -       -      +
    303E  VAL*     5.6     7.4    -      -       +      -
    306E  VAL*     4.2    20.0    -      -       +      -
    445E  VAL*     2.7    22.8    +      -       +      +
    446E  ILE*     2.7    16.0    +      -       -      +
    448E  LYS*     1.3    71.3    -      -       -      +
    450E  CYS*     1.3    57.1    +      -       -      +
    452E  TRP*     3.0    18.7    -      -       +      +
    453E  ILE*     3.0    36.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 450 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240E  TYR*     2.5    35.4    +      -       -      -
    241E  PHE*     2.7    53.5    -      -       +      -
    243E  PRO*     4.7     1.3    -      -       -      -
    244E  ALA*     5.1     5.8    -      -       -      -
    446E  ILE*     3.1     8.5    +      -       -      -
    447E  ASP*     2.9    16.0    +      -       -      +
    449E  ALA*     1.3    78.4    -      -       -      +
    451E  PHE*     1.3    58.0    +      -       -      +
    453E  ILE*     2.9    11.8    -      -       -      +
    454E  ALA*     2.8    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 451 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241E  PHE*     4.0     8.2    -      +       +      -
    447E  ASP      3.5     3.6    +      -       -      +
    448E  LYS*     3.2    26.3    +      -       -      +
    450E  CYS*     1.3    77.2    -      -       -      +
    452E  TRP*     1.4    79.6    +      +       -      +
    454E  ALA*     3.4    11.2    -      -       +      -
    455E  LEU*     3.1    44.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 452 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299E  ASN*     5.1     4.5    -      -       -      +
    445E  VAL*     4.2    12.5    +      -       +      +
    448E  LYS*     2.6    45.8    +      -       +      +
    449E  ALA*     3.0    31.5    -      -       +      +
    450E  CYS      3.1     0.2    -      -       -      -
    451E  PHE*     1.4    86.0    -      +       -      +
    453E  ILE*     1.3    61.1    +      -       +      +
    455E  LEU*     4.3     1.0    -      -       -      +
    456E  LEU*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 453 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    237E  VAL*     3.2    31.6    -      -       +      -
    240E  TYR*     2.7    51.4    -      -       +      -
    299E  ASN*     3.1    33.4    -      -       -      +
    303E  VAL*     5.5     0.9    -      -       +      -
    449E  ALA*     3.3    14.4    -      -       +      +
    450E  CYS      2.9    16.2    -      -       -      +
    452E  TRP*     1.3    71.9    -      -       +      +
    454E  ALA*     1.3    74.1    +      -       -      +
    456E  LEU*     3.4    13.9    -      -       +      +
    457E  LEU*     2.3    43.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 454 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    237E  VAL*     5.2     0.7    -      -       +      -
    241E  PHE*     4.2    11.0    -      -       +      -
    450E  CYS      2.8    16.1    +      -       -      +
    451E  PHE*     3.3    21.3    -      -       +      +
    453E  ILE*     1.3    87.9    -      -       +      +
    455E  LEU*     1.3    52.5    +      -       -      +
    457E  LEU*     2.7    29.3    -      -       -      +
    458E  PHE*     2.7    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 455 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    451E  PHE*     3.1    38.3    +      -       +      +
    452E  TRP      4.5     0.9    -      -       -      +
    454E  ALA*     1.3    79.2    -      -       -      +
    456E  LEU*     1.3    52.2    +      -       -      +
    458E  PHE*     3.1    26.2    +      -       +      -
    459E  SER*     2.7    36.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 456 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240E  TYR*     5.7     1.1    -      -       +      -
    295E  VAL*     4.5     6.3    -      -       +      -
    299E  ASN*     3.8    25.6    -      -       +      +
    452E  TRP      2.9    22.4    +      -       -      +
    453E  ILE*     3.4    17.3    -      -       +      +
    455E  LEU*     1.3    77.5    -      -       -      +
    457E  LEU*     1.3    60.2    +      -       +      +
    459E  SER*     2.5    23.8    +      -       -      +
    460E  LEU*     2.7    54.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 457 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233E  SER*     3.7    30.7    -      -       -      +
    234E  SER*     6.0     0.2    -      -       -      -
    236E  VAL*     5.6     2.7    -      -       +      -
    237E  VAL*     3.6    30.3    -      -       +      -
    240E  TYR*     5.9     2.2    -      -       +      -
    453E  ILE*     2.3    35.8    +      -       +      +
    454E  ALA*     2.7    11.7    -      -       -      +
    456E  LEU*     1.3    72.9    -      -       +      +
    458E  PHE*     1.3    57.3    -      -       -      +
    460E  LEU*     3.3     9.1    +      -       +      +
    461E  GLY*     2.8    29.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 458 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454E  ALA      2.7    13.6    +      -       -      +
    455E  LEU*     3.4    28.0    -      -       +      +
    457E  LEU*     1.3    76.5    -      -       -      +
    459E  SER*     1.3    52.3    +      -       -      +
    461E  GLY*     5.1     0.7    -      -       -      -
    462E  THR*     2.6    64.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 459 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    455E  LEU*     2.7    19.2    +      -       -      -
    456E  LEU*     2.5    36.8    +      -       -      +
    458E  PHE*     1.3    73.1    -      -       -      +
    460E  LEU*     1.3    58.0    +      -       -      +
    461E  GLY      3.1     1.3    -      -       -      -
    462E  THR*     4.3     4.3    -      -       -      -
    463E  LEU*     2.5    38.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 460 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291E  PHE*     5.5     3.4    -      -       +      -
    292E  VAL*     4.4    30.0    -      -       +      +
    295E  VAL*     3.4    46.4    -      -       +      -
    296E  ILE*     4.8     3.8    -      -       +      +
    456E  LEU*     2.7    53.9    +      -       +      +
    457E  LEU*     3.8     9.6    -      -       +      +
    459E  SER*     1.3    73.3    +      -       -      +
    461E  GLY*     1.3    57.8    +      -       -      +
    463E  LEU*     3.6    12.8    -      -       +      +
    464E  ALA*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 461 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292E  VAL*     6.1     1.1    -      -       -      -
    457E  LEU      2.8    17.2    +      -       -      -
    458E  PHE*     3.8     1.1    -      -       -      -
    460E  LEU*     1.3    75.0    -      -       -      +
    462E  THR*     1.3    58.2    +      -       -      +
    464E  ALA*     3.0     4.0    +      -       -      -
    465E  ILE*     2.6    46.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 462 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    458E  PHE*     2.6    58.5    +      -       +      -
    459E  SER*     3.9     4.3    -      -       -      -
    461E  GLY*     1.3    70.4    -      -       -      +
    463E  LEU*     1.3    63.8    +      -       -      +
    465E  ILE*     4.9     7.0    -      -       +      +
    466E  PHE*     2.7    47.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 463 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288E  PHE*     5.8     2.7    -      -       +      -
    291E  PHE*     3.6    36.3    -      -       +      -
    292E  VAL*     5.3     2.7    -      -       +      -
    459E  SER      2.5    32.3    +      -       -      +
    460E  LEU*     3.6    12.6    -      -       +      +
    462E  THR*     1.3    69.6    -      -       -      +
    464E  ALA*     1.3    61.9    +      -       +      +
    466E  PHE*     4.2     5.8    -      -       +      +
    467E  LEU*     3.1    42.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 464 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288E  PHE*     4.6    17.1    -      -       +      -
    292E  VAL*     4.0    23.1    -      -       +      -
    460E  LEU      2.9    18.1    +      -       -      +
    461E  GLY*     3.0     4.0    +      -       -      +
    463E  LEU*     1.3    76.6    -      -       +      +
    465E  ILE*     1.3    57.8    +      -       +      +
    466E  PHE      3.1     1.1    -      -       -      -
    467E  LEU*     2.9     6.9    +      -       -      +
    468E  THR*     2.6    39.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 465 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461E  GLY*     2.6    31.6    +      -       -      +
    462E  THR*     4.8     4.9    -      -       +      +
    464E  ALA*     1.3    73.5    -      -       +      +
    466E  PHE*     1.3    54.5    -      -       -      +
    468E  THR*     3.1    11.4    +      -       -      +
    469E  GLY*     2.7    30.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 466 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    462E  THR*     2.7    44.1    +      -       +      +
    463E  LEU*     4.8     4.9    -      -       +      -
    465E  ILE*     1.3    76.9    -      -       -      +
    467E  LEU*     1.3    70.8    +      -       +      +
    469E  GLY*     2.9    16.8    +      -       -      -
    470E  HIS*     3.0    13.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 467 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288E  PHE*     3.8    33.9    -      -       +      -
    463E  LEU*     3.1    36.1    +      -       +      +
    464E  ALA*     2.9     5.2    +      -       -      +
    466E  PHE*     1.3    89.5    -      -       +      +
    468E  THR*     1.3    63.2    +      -       -      +
    469E  GLY      2.9     1.3    -      -       -      -
    470E  HIS*     2.7    31.9    +      -       +      +
    471E  LEU*     2.8    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 468 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136E  PHE*     5.7     4.5    -      -       +      -
    219E  LEU*     6.5     0.4    -      -       +      -
    285E  TYR*     4.8    20.1    -      -       +      -
    288E  PHE*     4.9    15.0    -      -       -      +
    464E  ALA*     2.6    30.3    +      -       -      +
    465E  ILE*     3.7    10.2    -      -       -      -
    467E  LEU*     1.3    72.7    -      -       -      +
    469E  GLY*     1.3    64.2    +      -       -      +
    471E  LEU*     4.0     4.8    -      -       -      +
    472E  ASN*     3.5    22.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 469 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    465E  ILE      2.7    15.1    +      -       -      -
    466E  PHE*     2.9     8.9    +      -       -      -
    468E  THR*     1.3    78.4    -      -       -      +
    470E  HIS*     1.3    55.7    +      -       -      +
    472E  ASN*     3.8     7.1    -      -       -      +
    473E  GLN*     2.9    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 470 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466E  PHE*     3.0     9.0    +      -       +      +
    467E  LEU*     2.7    28.2    +      -       +      +
    469E  GLY*     1.3    73.1    -      -       -      +
    471E  LEU*     1.3    60.2    +      -       +      +
    472E  ASN      2.9     5.2    -      -       -      -
    473E  GLN*     2.9     7.3    +      -       +      +
    474E  VAL*     2.2    69.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 471 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135E  PRO*     5.3     2.7    -      -       +      -
    136E  PHE*     3.2    24.2    -      -       +      +
    137E  ASP*     5.0     3.8    -      -       -      +
    284E  LYS*     4.2    23.8    -      -       +      -
    285E  TYR*     3.2    39.7    -      -       +      +
    288E  PHE*     4.5    16.2    -      -       +      -
    467E  LEU      2.8    17.1    +      -       -      +
    468E  THR*     3.5     5.6    +      -       -      +
    470E  HIS*     1.3    75.3    -      -       +      +
    472E  ASN*     1.3    56.3    +      -       -      +
    475E  PRO*     3.8    21.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 472 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136E  PHE*     3.3    28.9    -      -       +      -
    215E  GLN*     5.9     2.6    -      -       -      +
    217E  LYS*     6.2     0.2    -      -       -      -
    468E  THR*     3.5    17.2    +      -       +      +
    469E  GLY*     3.8     5.7    -      -       -      +
    470E  HIS      2.9     0.4    -      -       -      -
    471E  LEU*     1.3    77.9    -      -       -      +
    473E  GLN*     1.3    55.3    +      -       -      +
    474E  VAL      3.6     1.1    -      -       -      -
    475E  PRO*     4.1     0.6    -      -       -      -
    476E  GLU*     2.4    74.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 473 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    469E  GLY      2.9    19.9    +      -       -      +
    470E  HIS*     2.9    10.3    +      -       +      +
    472E  ASN*     1.3    79.6    -      -       -      +
    474E  VAL*     1.3    63.7    +      -       -      +
    476E  GLU*     3.4    30.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 474 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470E  HIS*     2.2    58.4    +      -       +      +
    473E  GLN*     1.3    73.5    -      -       -      +
    475E  PRO*     1.3    74.4    -      -       +      +
    476E  GLU*     2.8    15.9    -      -       -      +
----------------------------------------------------------
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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