Contacts of the helix formed by residues 438 - 463 (chain E) in PDB entry 4KYI


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 GLU 438 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431E  ALA*     5.0     1.2    -      -       -      +
    436E  LYS      4.5     1.8    -      -       -      -
    437E  SER*     1.3    85.0    +      -       -      +
    439E  LYS*     1.3    66.7    +      -       +      +
    440E  GLU*     3.3     7.0    -      -       +      +
    441E  ILE*     3.0    24.4    +      -       +      +
    442E  PHE*     2.6    41.6    +      -       -      +
     82F  ARG*     5.5     2.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 439 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436E  LYS      5.3     8.5    -      -       -      +
    438E  GLU*     1.3    80.0    -      -       +      +
    440E  GLU*     1.3    62.6    +      -       -      +
    442E  PHE*     3.7    10.0    -      -       +      +
    443E  GLU*     3.1    39.8    +      -       -      +
     82F  ARG*     5.4    11.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 440 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22E  LYS*     3.5    22.3    -      -       -      +
     28E  TYR*     2.2    35.7    +      -       -      -
    416E  PRO*     4.6    12.3    -      -       +      +
    438E  GLU*     3.3     5.5    -      -       +      +
    439E  LYS*     1.3    79.9    -      -       -      +
    441E  ILE*     1.3    66.7    +      -       +      +
    443E  GLU*     3.9     9.7    +      -       -      +
    444E  ALA*     3.3    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 441 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20E  ILE*     4.0    39.9    -      -       +      +
     21E  SER*     5.3     2.5    -      -       -      -
     22E  LYS*     5.4     4.0    -      -       +      +
     28E  TYR*     4.9    12.3    -      -       +      -
    416E  PRO*     4.6     8.1    -      -       +      -
    420E  ILE*     4.5    13.7    -      -       +      -
    429E  LYS*     4.4    13.0    -      -       -      +
    431E  ALA*     3.7    21.8    -      -       +      -
    438E  GLU*     3.0    24.7    +      -       +      +
    440E  GLU*     1.3    87.8    -      -       +      +
    442E  PHE*     1.3    57.7    +      -       -      +
    443E  GLU      3.2     1.6    -      -       -      -
    444E  ALA*     3.6     4.6    -      -       -      -
    445E  SER*     2.8    32.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 442 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    431E  ALA*     4.4    13.6    -      -       -      +
    432E  LEU*     3.2    40.9    -      -       +      +
    438E  GLU      2.6    26.6    +      -       -      +
    439E  LYS*     3.7     7.6    -      -       +      +
    441E  ILE*     1.3    73.8    -      -       -      +
    443E  GLU*     1.3    70.3    +      -       +      +
    446E  ALA*     3.2     8.0    +      -       -      +
     82F  ARG*     3.5    59.9    -      -       +      +
     83F  TYR*     3.5    40.8    -      +       -      -
     85F  SER*     4.3     5.2    -      -       -      -
     86F  LEU*     3.6    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 443 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    439E  LYS*     3.1    25.9    +      -       -      +
    440E  GLU*     4.2     8.6    -      -       -      +
    442E  PHE*     1.3    83.6    -      -       +      +
    444E  ALA*     1.3    60.0    +      -       -      +
    445E  SER      3.1     0.2    -      -       -      -
    446E  ALA*     3.0     3.8    +      -       -      +
    447E  HIS*     2.9    49.4    +      -       +      +
     85F  SER*     4.3    14.8    +      -       -      +
     86F  LEU*     4.1    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 444 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    415E  HIS*     5.2     3.4    -      -       +      -
    416E  PRO*     4.2    20.4    -      -       +      -
    417E  LEU*     3.8    15.5    -      -       +      +
    420E  ILE*     3.9    13.4    -      -       +      +
    440E  GLU      3.3    16.5    +      -       -      +
    441E  ILE*     3.2     7.7    +      -       -      +
    443E  GLU*     1.3    79.9    -      -       -      +
    445E  SER*     1.3    56.9    +      -       -      +
    447E  HIS*     3.4    16.6    +      -       -      +
    448E  ALA*     3.0    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 445 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    420E  ILE*     3.8    19.9    -      -       -      +
    425E  HIS*     5.9     2.1    -      -       -      +
    430E  ASP*     4.5     6.8    +      -       -      -
    431E  ALA*     4.3    14.2    +      -       -      +
    432E  LEU*     3.8    28.1    -      -       -      +
    441E  ILE      2.8    18.0    +      -       -      -
    443E  GLU      3.1     0.2    -      -       -      -
    444E  ALA*     1.3    75.9    -      -       -      +
    446E  ALA*     1.3    62.2    -      -       -      +
    448E  ALA*     3.6     4.9    +      -       -      +
    449E  GLN*     3.3    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 446 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    432E  LEU*     4.0     8.5    -      -       +      +
    442E  PHE      3.2     8.5    +      -       -      +
    443E  GLU      3.0     9.3    +      -       -      +
    445E  SER*     1.3    77.1    -      -       -      +
    447E  HIS*     1.3    63.2    +      -       -      +
    448E  ALA      3.2     0.2    -      -       -      -
    449E  GLN*     3.6    11.0    +      -       -      +
    450E  ALA*     3.3    21.7    +      -       -      +
     55F  GLY*     5.6     1.3    -      -       -      -
     86F  LEU*     3.6    39.0    -      -       +      -
     89F  MET*     3.9    11.5    -      -       +      +
     90F  TYR*     4.3     5.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 447 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    415E  HIS*     5.5     1.5    -      +       -      -
    417E  LEU*     4.0    16.4    -      -       +      +
    443E  GLU*     2.9    40.6    +      -       +      +
    444E  ALA*     3.5    16.4    -      -       +      +
    445E  SER      3.4     0.2    -      -       -      -
    446E  ALA*     1.3    77.5    -      -       -      +
    448E  ALA*     1.3    55.8    +      -       -      +
    450E  ALA*     3.4     3.1    +      -       -      +
    451E  ILE*     3.1    35.2    +      -       -      +
    480E  ILE*     4.1    13.1    -      -       +      +
    484E  ASP*     3.1    42.8    +      -       +      +
    485E  ALA*     4.0    14.1    -      -       -      +
     86F  LEU*     5.4     2.2    -      -       +      +
     89F  MET*     3.4    24.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 448 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417E  LEU*     4.2    13.9    -      -       +      +
    420E  ILE*     3.6    29.4    -      -       +      +
    421E  LEU*     4.6    12.1    -      -       +      +
    425E  HIS*     6.0     1.8    -      -       +      -
    444E  ALA      3.0    16.7    +      -       -      +
    445E  SER      3.7     5.8    -      -       -      +
    446E  ALA      3.2     0.4    -      -       -      -
    447E  HIS*     1.3    74.9    -      -       -      +
    449E  GLN*     1.3    60.9    +      -       -      +
    451E  ILE*     3.4     2.5    +      -       -      +
    452E  LEU*     2.9    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 449 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    432E  LEU*     4.0    15.3    -      -       +      +
    445E  SER      3.3    11.1    +      -       -      +
    446E  ALA*     3.7    12.1    -      -       -      +
    448E  ALA*     1.3    79.7    -      -       -      +
    450E  ALA*     1.3    61.3    +      -       +      +
    452E  LEU*     3.9    10.6    -      -       +      +
    453E  HIS*     2.9    43.8    +      -       +      +
     54F  ILE*     3.7    12.1    +      -       -      +
     55F  GLY*     3.3     6.5    -      -       -      -
     56F  ALA*     2.5    47.1    +      -       +      +
     90F  TYR*     4.1     2.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 450 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    446E  ALA      3.3    11.6    +      -       -      +
    447E  HIS      3.5     8.5    -      -       -      +
    448E  ALA      3.1     0.8    -      -       -      -
    449E  GLN*     1.3    79.7    -      -       +      +
    451E  ILE*     1.3    64.6    +      -       -      +
    453E  HIS*     3.2     4.9    +      -       -      +
    454E  LEU*     3.0    27.3    +      -       -      +
    480E  ILE*     3.9     9.9    -      -       +      -
     75F  TRP*     3.8    27.6    -      -       +      -
     89F  MET*     3.7    21.5    -      -       -      -
     90F  TYR*     4.9     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 451 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417E  LEU*     4.1    15.9    -      -       +      -
    421E  LEU*     4.1    16.2    -      -       +      -
    447E  HIS      3.1    18.6    +      -       -      +
    448E  ALA      3.8     3.6    -      -       -      +
    450E  ALA*     1.3    74.1    -      -       -      +
    452E  LEU*     1.3    52.4    +      -       -      +
    454E  LEU*     3.0    10.9    +      -       -      +
    455E  GLN*     2.7    46.3    +      -       +      +
    477E  ILE*     3.7    26.0    -      -       +      -
    480E  ILE*     4.1    18.6    -      -       +      -
    481E  LEU*     3.7    31.6    -      -       +      -
    499E  CYS*     3.8    15.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 452 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    365E  TYR*     5.2    10.1    -      -       +      +
    421E  LEU*     5.5     3.1    -      -       +      +
    425E  HIS*     3.9    31.6    -      -       +      +
    448E  ALA      2.9    18.5    +      -       -      +
    449E  GLN*     3.9    10.5    -      -       +      +
    451E  ILE*     1.3    76.9    -      -       -      +
    453E  HIS*     1.3    62.2    +      -       +      +
    455E  GLN*     3.8    20.1    -      -       +      +
    456E  GLU*     3.1    56.8    +      -       +      +
    502E  GLN*     5.7     0.4    -      -       -      +
    506E  LEU*     5.8     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 453 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    449E  GLN*     2.9    37.8    +      -       +      +
    450E  ALA*     3.4     6.7    -      -       -      +
    452E  LEU*     1.3    79.3    -      -       +      +
    454E  LEU*     1.3    59.7    +      -       -      +
    456E  GLU*     3.7    13.0    +      -       -      +
    457E  GLN*     3.3    27.4    +      -       -      +
     56F  ALA      3.6    24.9    -      -       -      -
     57F  ALA*     4.0     1.9    -      -       -      -
     58F  PHE*     3.6    45.4    +      -       +      +
     75F  TRP*     4.2    12.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 454 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    450E  ALA      3.0    18.0    +      -       -      +
    451E  ILE      3.0     5.8    +      -       -      +
    453E  HIS*     1.3    75.9    -      -       -      +
    455E  GLN*     1.3    65.5    +      -       -      +
    457E  GLN*     3.1    12.7    +      -       -      +
    458E  ILE*     3.2    20.3    +      -       -      +
    473E  TYR*     3.8    32.4    -      -       +      +
    476E  GLN*     3.7    39.3    -      -       +      +
    477E  ILE*     3.7    26.2    -      -       +      +
    480E  ILE*     4.0    15.3    -      -       +      -
     58F  PHE*     4.5     9.4    -      -       +      -
     75F  TRP*     4.2    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 455 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    365E  TYR*     5.0     1.4    +      -       -      -
    421E  LEU*     4.8     3.3    -      -       -      +
    451E  ILE*     2.7    29.4    +      -       +      +
    452E  LEU*     3.8    27.2    -      -       +      +
    454E  LEU*     1.3    72.8    -      -       -      +
    456E  GLU*     1.3    63.4    +      -       +      +
    457E  GLN      3.2     1.0    +      -       -      -
    458E  ILE*     3.3    13.5    +      -       -      +
    459E  VAL*     3.3    20.1    +      -       -      +
    477E  ILE*     3.8    14.3    -      -       +      +
    499E  CYS*     2.8    36.5    +      -       -      +
    502E  GLN*     3.0    34.0    +      -       -      +
    503E  VAL*     3.7    19.8    -      -       +      +
    506E  LEU*     5.4     7.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 456 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    452E  LEU*     3.1    45.0    +      -       +      +
    453E  HIS*     4.0    14.4    -      -       -      +
    455E  GLN*     1.3    76.6    -      -       +      +
    457E  GLN*     1.3    58.1    +      -       -      +
    459E  VAL*     4.1     8.8    -      -       -      +
    460E  LYS*     3.2    25.8    +      -       -      +
    506E  LEU*     5.1    12.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 457 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    453E  HIS      3.3    15.0    +      -       -      +
    454E  LEU*     3.1     8.0    +      -       -      +
    455E  GLN      3.1     0.8    -      -       -      -
    456E  GLU*     1.3    78.4    +      -       -      +
    458E  ILE*     1.3    64.0    +      -       -      +
    460E  LYS*     3.8    29.4    -      -       -      +
    461E  GLU*     3.2    56.3    +      -       -      +
    473E  TYR*     4.1    15.2    +      -       +      -
     58F  PHE*     3.4    37.0    +      -       +      -
     59F  LEU*     5.5     1.6    -      -       -      +
     60F  THR*     4.5    14.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 458 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    454E  LEU      3.2    15.2    +      -       -      +
    455E  GLN      3.3     4.9    +      -       -      +
    457E  GLN*     1.3    78.2    -      -       -      +
    459E  VAL*     1.3    62.4    +      -       -      +
    461E  GLU*     3.4     3.5    +      -       -      +
    462E  MET*     3.1    48.0    +      -       +      +
    470E  VAL*     4.1    28.4    -      -       +      +
    473E  TYR*     3.5    32.5    -      -       +      -
    474E  LEU*     3.7    34.1    -      -       +      +
    477E  ILE*     4.5     8.1    -      -       +      -
    503E  VAL*     4.0    17.0    -      -       +      -
    511E  LEU*     4.7     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 459 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    455E  GLN      3.3    18.8    +      -       -      +
    456E  GLU*     4.2     7.9    -      -       -      +
    458E  ILE*     1.3    77.2    -      -       -      +
    460E  LYS*     1.3    63.9    +      -       -      +
    462E  MET*     3.4     8.8    +      -       -      +
    463E  ASN*     3.1    42.9    +      -       -      +
    503E  VAL*     3.8    29.8    -      -       +      +
    506E  LEU*     3.2    40.8    -      -       +      +
    507E  SER*     4.0     6.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 460 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    456E  GLU      3.2    18.4    +      -       -      +
    457E  GLN*     3.8    31.0    -      -       -      +
    458E  ILE      3.3     0.2    -      -       -      -
    459E  VAL*     1.3    80.9    -      -       -      +
    461E  GLU*     1.3    63.2    +      -       +      +
    463E  ASN*     3.8     8.2    +      -       -      +
    464E  ASP*     3.7    17.0    +      -       -      +
    464G  ASP*     3.6    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 461 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    457E  GLN*     3.2    25.6    +      -       -      +
    458E  ILE*     4.1     3.1    -      -       -      +
    460E  LYS*     1.3    77.9    -      -       +      +
    462E  MET*     1.3    57.4    +      -       -      +
    463E  ASN      3.4     0.2    -      -       -      -
    464E  ASP*     3.3     6.2    +      -       -      +
    465E  GLY      3.1     3.8    +      -       -      -
    466E  ASP*     2.7    55.2    +      -       +      +
    469E  SER*     2.4    28.1    +      -       -      -
    470E  VAL*     6.5     0.2    -      -       +      -
    473E  TYR*     2.9    32.3    +      -       -      -
     60F  THR*     5.4     0.9    +      -       -      +
     71F  LYS*     3.3    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 462 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    458E  ILE*     3.1    41.3    +      -       +      +
    459E  VAL*     3.4     7.6    +      -       -      +
    461E  GLU*     1.3    73.4    -      -       -      +
    463E  ASN*     1.3    59.7    +      -       -      +
    464E  ASP      3.1     4.7    -      -       -      -
    465E  GLY*     3.0    18.1    +      -       -      +
    466E  ASP      4.0     3.8    -      -       -      +
    467E  TYR*     3.5    48.0    +      -       +      +
    470E  VAL*     4.3    10.8    -      -       +      -
    503E  VAL*     4.2     3.6    -      -       +      -
    507E  SER*     3.6    31.6    -      -       -      +
    510E  LYS*     4.2     8.8    -      -       +      +
    511E  LEU*     3.9    33.7    -      -       +      +
    514E  TYR*     5.3     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 463 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    459E  VAL*     3.1    36.5    +      -       -      +
    460E  LYS*     4.0     7.9    -      -       -      +
    461E  GLU      3.4     0.2    -      -       -      -
    462E  MET*     1.3    76.7    -      -       -      +
    464E  ASP*     1.3    59.2    +      -       -      +
    506E  LEU      5.2     1.4    +      -       -      -
    507E  SER*     4.6     3.7    -      -       -      +
    510E  LYS*     2.7    42.0    +      -       -      +
    460G  LYS*     6.1     0.2    -      -       -      -
----------------------------------------------------------
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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