Contacts of the helix formed by residues 443 - 466 (chain A) in PDB entry 2WWB


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 SER 443 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  TRP*     3.1    45.9    +      -       -      -
     67A  VAL*     4.4     9.3    -      -       -      +
     68A  ILE*     3.7    11.7    -      -       -      +
    351A  PHE*     4.9     1.8    -      -       -      -
    436A  ASP*     4.7     0.4    -      -       -      -
    440A  ALA*     4.0     4.8    -      -       -      +
    441A  ILE*     3.7     7.7    -      -       -      +
    442A  GLY*     1.4    82.1    +      -       -      +
    444A  GLY*     1.4    61.6    +      -       -      +
    445A  THR      4.2     0.4    -      -       -      +
    446A  GLY*     3.4    21.0    +      -       -      -
    447A  ILE*     3.5    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 444 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435A  ALA*     3.4    23.8    -      -       -      +
    436A  ASP*     3.1    27.0    +      -       -      -
    440A  ALA*     3.8     9.3    -      -       -      +
    443A  SER*     1.4    69.0    -      -       -      +
    445A  THR*     1.4    62.8    +      -       -      +
    446A  GLY      3.3     0.4    -      -       -      -
    447A  ILE*     3.5    20.8    +      -       -      +
    448A  LEU*     3.5    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 445 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  TRP*     4.2    24.0    -      -       +      -
     68A  ILE*     5.6     2.0    -      -       +      -
    291A  ILE*     5.5     2.7    -      -       +      -
    295A  SER*     3.4    26.7    -      -       -      +
    364A  TYR*     5.0     0.5    +      -       -      -
    368A  MET*     4.7    10.1    -      -       +      +
    432A  SER*     3.4    35.9    +      -       -      +
    433A  VAL*     4.5     0.5    +      -       -      -
    436A  ASP*     3.0    18.0    +      -       -      -
    443A  SER*     4.8     1.3    -      -       -      -
    444A  GLY*     1.4    76.3    -      -       -      +
    446A  GLY*     1.4    60.9    +      -       -      +
    448A  LEU*     3.4     6.7    +      -       -      +
    449A  LEU*     3.2    24.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 446 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  VAL*     5.3     2.9    -      -       -      -
     68A  ILE*     4.7    12.1    -      -       -      +
    187A  ILE*     3.3    28.8    -      -       -      +
    443A  SER*     3.4    17.2    +      -       -      -
    444A  GLY      3.3     0.8    -      -       -      -
    445A  THR*     1.4    77.5    -      -       -      +
    447A  ILE*     1.4    61.2    +      -       -      +
    449A  LEU*     3.3     6.9    +      -       -      +
    450A  ALA*     3.1    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 447 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  ILE*     4.4     6.7    -      -       -      -
    191A  ILE*     4.3    20.4    -      -       +      -
    247A  ALA*     3.6    36.3    -      -       +      +
    248A  THR*     4.5    14.6    -      -       +      +
    251A  VAL*     4.3    20.9    -      -       +      -
    439A  GLY      4.4     1.1    -      -       -      +
    440A  ALA*     4.4     0.9    -      -       -      -
    441A  ILE*     3.8    27.4    -      -       +      +
    443A  SER      3.5    12.7    +      -       -      +
    444A  GLY*     3.8    19.5    -      -       -      +
    445A  THR      3.4     0.6    -      -       -      -
    446A  GLY*     1.4    73.7    -      -       -      +
    448A  LEU*     1.4    61.0    +      -       -      +
    450A  ALA*     3.3    10.8    +      -       +      +
    451A  VAL*     3.3    19.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 448 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251A  VAL*     4.0    24.3    -      -       +      +
    254A  VAL*     5.1     7.2    -      -       +      -
    255A  VAL*     5.2     5.8    -      -       +      -
    258A  PHE*     5.9     1.3    -      -       +      -
    428A  ILE*     3.8    21.5    -      -       +      +
    431A  LEU*     3.9    31.6    -      -       +      -
    432A  SER*     3.4    31.6    -      -       -      +
    435A  ALA*     5.2     2.9    -      -       +      -
    444A  GLY      3.5     8.3    +      -       -      +
    445A  THR*     3.4    10.5    +      -       -      +
    446A  GLY      3.3     0.6    -      -       -      -
    447A  ILE*     1.4    75.8    -      -       -      +
    449A  LEU*     1.4    62.4    +      -       +      +
    451A  VAL*     3.3    13.2    -      -       +      +
    452A  THR*     2.9    28.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 449 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ILE*     3.9    22.7    -      -       +      -
    183A  ILE*     5.3     5.6    -      -       +      -
    187A  ILE*     4.8     5.4    -      -       +      -
    288A  ASN*     4.7     7.6    -      -       -      +
    291A  ILE*     3.9    28.0    -      -       +      -
    292A  ILE*     3.9    35.0    -      -       +      -
    295A  SER*     3.9    21.1    -      -       -      +
    428A  ILE*     5.8     2.5    -      -       +      -
    445A  THR*     3.2    14.3    +      -       +      +
    446A  GLY*     3.3     9.2    +      -       -      +
    448A  LEU*     1.4    78.4    -      -       +      +
    450A  ALA*     1.4    62.5    +      -       -      +
    452A  THR*     3.5     5.0    +      -       -      -
    453A  ILE*     3.3    35.8    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    184A  ALA*     4.8    10.5    -      -       -      +
    187A  ILE*     3.6    33.2    -      -       +      +
    188A  CYS*     5.2     4.0    -      -       -      +
    191A  ILE*     5.4     5.2    -      -       +      -
    446A  GLY      3.1    13.9    +      -       -      +
    447A  ILE*     3.3     9.6    +      -       -      +
    449A  LEU*     1.4    76.2    -      -       -      +
    451A  VAL*     1.4    59.5    +      -       +      +
    453A  ILE*     4.1     0.7    -      -       -      +
    454A  ILE*     3.1    39.7    +      -       +      +
     44B  PHE*     5.6     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 451 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    248A  THR*     5.9     4.7    -      -       +      -
    251A  VAL*     3.7    23.8    -      -       +      -
    252A  PHE*     5.8     6.3    -      -       +      -
    255A  VAL*     3.8    32.0    -      -       +      +
    447A  ILE*     3.3    16.8    +      -       +      +
    448A  LEU*     3.3    13.7    -      -       +      +
    450A  ALA*     1.4    77.0    -      -       +      +
    452A  THR*     1.4    67.1    +      -       -      +
    454A  ILE*     4.7     1.3    -      -       -      +
    455A  TYR*     3.3    45.6    +      -       +      +
     44B  PHE*     5.0    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 452 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255A  VAL*     4.5    12.4    -      -       +      +
    259A  GLN*     5.3     5.3    +      -       +      +
    284A  PHE*     5.5     8.3    -      -       +      +
    285A  TYR*     3.4    22.0    -      -       +      -
    288A  ASN*     4.0    15.7    -      -       +      +
    428A  ILE*     5.6     9.0    -      -       +      +
    448A  LEU*     2.9    24.7    +      -       -      +
    449A  LEU*     3.8     6.9    -      -       -      -
    450A  ALA      3.4     0.6    -      -       -      -
    451A  VAL*     1.4    82.6    -      -       -      +
    453A  ILE*     1.4    60.4    +      -       -      +
    455A  TYR*     5.1     0.2    -      -       -      +
    456A  GLN*     3.4    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 453 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180A  SER*     4.6    22.9    -      -       -      +
    181A  LEU*     6.0     3.1    -      -       +      -
    183A  ILE*     5.2     7.0    -      -       +      -
    184A  ALA*     4.0    25.8    -      -       +      +
    285A  TYR*     3.7    12.7    +      -       -      +
    288A  ASN*     3.6    23.3    -      -       -      +
    292A  ILE*     3.9    28.7    -      -       +      -
    449A  LEU*     3.3    22.3    +      -       +      +
    450A  ALA      4.2     2.0    -      -       -      +
    452A  THR*     1.4    75.9    -      -       -      +
    454A  ILE*     1.4    59.4    +      -       +      +
    457A  TYR*     3.0    37.2    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    181A  LEU*     5.9     5.6    -      -       +      -
    184A  ALA*     3.8    27.6    -      -       +      +
    185A  THR*     5.2     1.8    -      -       -      +
    188A  CYS*     4.1    22.7    -      -       -      -
    450A  ALA      3.1    23.0    +      -       -      +
    451A  VAL*     4.6     2.7    -      -       -      +
    452A  THR      3.6     0.2    -      -       -      -
    453A  ILE*     1.4    74.4    -      -       +      +
    455A  TYR*     1.4    70.4    +      -       +      +
    457A  TYR*     3.8     6.7    +      -       -      +
    458A  PHE*     3.8    13.2    +      -       -      +
     40B  THR*     4.0    23.5    +      -       +      +
     43B  GLY      5.3     3.1    -      -       -      +
     44B  PHE*     4.7    16.6    -      -       +      -
     47B  MET*     5.0    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 455 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    252A  PHE*     4.2    23.1    -      +       -      -
    255A  VAL*     5.8     2.0    -      -       +      -
    256A  ILE*     5.2    10.1    -      -       +      -
    259A  GLN*     3.4    26.0    -      -       -      +
    451A  VAL*     3.3    37.2    +      -       +      +
    454A  ILE*     1.4    82.1    -      -       +      +
    456A  GLN*     1.4    62.1    +      -       -      +
    457A  TYR      3.7     0.2    +      -       -      -
    458A  PHE*     4.0     7.4    +      -       -      +
    459A  GLU*     3.1    20.3    -      -       -      +
     36B  ILE*     3.5    38.1    -      -       +      -
     37B  ALA*     4.4     8.7    -      -       -      +
     40B  THR*     3.3    36.9    +      -       +      -
     41B  ALA*     4.2    14.4    +      -       -      +
     44B  PHE*     5.0    12.9    -      +       +      +
----------------------------------------------------------
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Residues in contact with GLN 456 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259A  GLN*     3.7    30.5    +      -       +      +
    262A  ARG*     6.3     1.2    -      -       -      +
    282A  LYS*     3.2    28.6    +      -       -      +
    285A  TYR*     3.7    40.8    -      -       +      +
    452A  THR      3.4    20.0    +      -       -      +
    453A  ILE      3.6     0.6    +      -       -      -
    454A  ILE      3.4     0.4    -      -       -      -
    455A  TYR*     1.4    77.6    -      -       -      +
    457A  TYR*     1.4    63.7    +      -       -      +
    459A  GLU*     3.2    35.7    +      -       -      +
    460A  ILE*     3.4    11.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 457 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  THR*     6.5     0.4    -      -       +      -
    175A  LEU      3.0    25.1    +      -       -      -
    176A  GLY*     3.7    14.4    -      -       -      -
    177A  SER*     4.6     6.0    +      -       -      -
    181A  LEU*     4.8    22.0    -      -       +      -
    285A  TYR*     4.2    12.5    +      +       -      +
    453A  ILE*     3.0    27.5    +      -       +      +
    454A  ILE*     4.5     2.9    -      -       -      +
    455A  TYR      3.5     0.2    -      -       -      -
    456A  GLN*     1.4    75.0    -      -       -      +
    458A  PHE*     1.4    57.5    +      -       -      +
    460A  ILE*     3.2    25.8    +      -       +      +
    461A  PHE*     3.0    53.0    +      +       +      +
    464A  GLU*     4.0     4.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 458 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454A  ILE      3.8    14.7    +      -       -      +
    455A  TYR      4.1     5.6    -      -       -      +
    456A  GLN      3.3     0.6    -      -       -      -
    457A  TYR*     1.4    77.3    -      -       -      +
    459A  GLU*     1.4    64.2    +      -       +      +
    461A  PHE*     3.6    13.8    +      +       +      +
    462A  VAL*     3.7    21.5    -      -       +      +
    470A  SER*     3.9    31.2    +      -       -      -
    471A  MET      4.5    11.9    -      -       -      -
    472A  GLY*     6.2     0.4    -      -       -      -
    474A  LEU*     6.2     5.6    -      -       +      -
     39B  ALA*     3.5    38.8    -      -       +      -
     40B  THR*     5.0     7.6    -      -       +      +
     43B  GLY*     6.6     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 459 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259A  GLN*     3.4    21.1    +      -       -      -
    455A  TYR*     3.1    22.4    -      -       -      +
    456A  GLN*     3.2    22.6    +      -       -      +
    458A  PHE*     1.4    78.7    -      -       +      +
    460A  ILE*     1.4    61.2    +      -       +      +
    462A  VAL      4.3     1.6    +      -       -      -
    463A  LYS*     3.5    27.2    +      -       -      +
    470A  SER*     4.0    14.3    +      -       -      +
     36B  ILE*     4.8    18.1    -      -       +      +
     39B  ALA*     6.1     4.3    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    282A  LYS*     4.4    15.9    -      -       -      +
    285A  TYR*     3.9    28.5    -      -       +      -
    456A  GLN*     3.4    24.4    +      -       +      +
    457A  TYR*     3.2    23.0    +      -       +      +
    459A  GLU*     1.4    74.3    -      -       +      +
    461A  PHE*     1.4    64.0    -      -       -      +
    463A  LYS*     3.2    18.2    +      -       -      +
    464A  GLU*     3.3    34.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 461 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  VAL*     4.0    20.0    -      -       +      -
     35A  THR*     4.5    17.7    -      -       +      -
    175A  LEU*     4.0    23.7    -      -       +      +
    176A  GLY*     4.2     8.5    -      -       -      -
    457A  TYR*     3.0    47.5    +      +       +      +
    458A  PHE*     4.0    11.7    -      +       +      +
    459A  GLU      3.5     0.8    -      -       -      -
    460A  ILE*     1.4    75.6    -      -       -      +
    462A  VAL*     1.4    64.4    +      -       +      +
    464A  GLU*     3.4    17.2    +      -       -      +
    465A  GLN*     3.3    22.0    +      -       +      +
    473A  ALA*     3.9    33.0    -      -       +      -
    474A  LEU*     5.9     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 462 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    458A  PHE*     3.7    23.1    +      -       +      +
    459A  GLU      4.3     0.4    +      -       -      +
    460A  ILE      3.4     0.2    -      -       -      -
    461A  PHE*     1.4    79.6    -      -       +      +
    463A  LYS*     1.4    64.3    +      -       -      +
    465A  GLN*     3.3    15.6    +      -       -      +
    467A  GLU*     3.0    45.7    +      -       +      +
    468A  VAL*     4.1     2.7    -      -       -      +
    470A  SER*     3.8    30.5    -      -       -      +
    471A  MET*     3.5    29.2    -      -       +      +
    472A  GLY      4.6     2.7    -      -       -      +
    473A  ALA*     4.7     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 463 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    459A  GLU*     3.5    16.9    +      -       -      +
    460A  ILE*     3.2     9.3    +      -       -      +
    462A  VAL*     1.4    74.5    -      -       -      +
    464A  GLU*     1.4    61.9    +      -       +      +
    465A  GLN      3.5     0.2    +      -       -      -
    466A  SER*     3.8     8.1    +      -       -      -
    467A  GLU      3.5     9.8    -      -       -      +
    468A  VAL*     3.9    28.6    -      -       +      +
    469A  GLY      3.5    15.9    -      -       -      +
    470A  SER*     3.4    27.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 464 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  PHE*     4.4    10.0    -      -       -      -
    175A  LEU*     3.9    43.6    -      -       +      +
    457A  TYR*     4.0     5.8    +      -       -      -
    460A  ILE*     3.3    29.5    +      -       +      +
    461A  PHE*     3.5    31.9    -      -       -      +
    463A  LYS*     1.4    75.7    -      -       +      +
    465A  GLN*     1.4    63.3    +      -       -      +
    466A  SER*     3.4     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 465 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  PHE*     3.2    46.2    +      -       -      +
     32A  VAL*     3.7    17.0    -      -       +      +
    175A  LEU*     3.9    12.7    -      -       +      +
    461A  PHE*     3.3    10.9    +      -       +      +
    462A  VAL*     3.3    16.1    +      -       -      +
    464A  GLU*     1.4    78.7    -      -       -      +
    466A  SER*     1.4    68.7    +      -       -      +
    467A  GLU*     3.3    19.5    -      -       -      +
    473A  ALA*     3.9    20.9    -      -       +      -
    476A  PHE*     3.2    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 466 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  PHE*     3.3    35.0    -      -       -      -
    462A  VAL      3.7     0.4    +      -       -      -
    463A  LYS      3.8     5.3    +      -       -      -
    464A  GLU      3.3     3.9    -      -       -      -
    465A  GLN*     1.4    81.4    +      -       -      +
    467A  GLU*     1.4    64.4    +      -       -      +
----------------------------------------------------------
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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