Contacts of the helix formed by residues 392 - 422 (chain A) in PDB entry 6R7Z


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 LEU 392 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  GLU*     4.6    19.7    -      -       +      +
    283A  GLU      4.2     6.1    -      -       -      +
    284A  PRO*     4.8     0.2    -      -       -      -
    285A  ARG*     3.5     9.5    -      -       -      +
    390A  HIS*     4.0     2.4    -      -       -      +
    391A  ARG*     1.3    82.2    -      -       +      +
    393A  GLU*     1.3    62.0    +      -       -      +
    394A  SER*     4.0    11.0    -      -       -      +
    395A  ALA*     4.3    15.0    -      -       +      +
    396A  TYR*     3.4    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 393 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283A  GLU      4.8     2.8    +      -       -      +
    285A  ARG*     3.7    17.0    -      -       +      +
    286A  PRO*     5.5     3.4    -      -       +      -
    392A  LEU*     1.3    75.6    -      -       -      +
    394A  SER*     1.3    56.9    +      -       -      +
    395A  ALA      3.3     0.4    -      -       -      -
    396A  TYR*     3.6    11.2    -      -       +      +
    397A  GLN*     2.7    35.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 394 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    392A  LEU*     3.5     6.3    -      -       -      +
    393A  GLU*     1.3    78.8    -      -       -      +
    395A  ALA*     1.3    57.3    +      -       -      +
    397A  GLN*     3.4     6.0    +      -       -      +
    398A  ASN*     2.8    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 395 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  HIS*     5.0     6.3    -      -       +      -
    391A  ARG      5.7     0.9    -      -       -      +
    392A  LEU*     4.3    17.8    +      -       +      +
    393A  GLU      3.3     0.4    -      -       -      -
    394A  SER*     1.3    75.4    -      -       -      +
    396A  TYR*     1.3    60.5    +      -       -      +
    398A  ASN*     3.7     5.6    -      -       -      +
    399A  HIS*     2.7    47.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 396 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285A  ARG*     5.4     6.1    -      -       +      -
    382A  GLU*     4.6    10.5    +      -       -      +
    385A  THR*     3.7    42.9    -      -       -      -
    386A  SER*     3.9    15.2    -      -       -      -
    390A  HIS*     3.8    19.0    -      -       +      +
    392A  LEU      3.4    19.3    +      -       -      +
    393A  GLU*     3.4    13.7    +      -       +      +
    394A  SER      3.3     0.4    -      -       -      -
    395A  ALA*     1.3    79.7    -      -       -      +
    397A  GLN*     1.3    66.3    +      -       +      +
    399A  HIS*     3.6     4.6    +      -       -      +
    400A  LEU*     3.1    28.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 397 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    393A  GLU      2.7    22.5    +      -       -      +
    394A  SER*     3.7     6.7    -      -       -      +
    396A  TYR*     1.3    79.9    -      -       +      +
    398A  ASN*     1.3    51.0    +      -       -      +
    400A  LEU*     3.4     6.0    +      -       -      +
    401A  ILE*     2.7    36.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 398 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    394A  SER      2.8    21.1    +      -       -      +
    395A  ALA*     3.3     8.2    +      -       -      +
    397A  GLN*     1.3    71.8    -      -       -      +
    399A  HIS*     1.3    64.9    +      -       +      +
    401A  ILE*     3.3     7.2    +      -       -      +
    402A  LEU*     2.8    29.6    +      -       -      +
    554A  VAL*     5.7    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 399 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314A  ILE*     5.9     7.6    -      -       +      -
    385A  THR*     5.4     8.7    -      -       -      -
    395A  ALA*     2.7    38.3    +      -       +      +
    396A  TYR*     4.1     5.2    -      -       -      +
    398A  ASN*     1.3    77.9    -      -       +      +
    400A  LEU*     1.3    61.2    +      -       -      +
    402A  LEU*     3.2     7.3    +      -       +      +
    403A  LYS*     2.9    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 400 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    381A  ALA*     5.5     8.4    -      -       +      +
    382A  GLU*     6.2     1.6    -      -       -      -
    385A  THR*     4.7    15.8    -      -       -      -
    396A  TYR*     3.1    24.6    +      -       +      +
    397A  GLN*     3.7     6.1    -      -       -      +
    399A  HIS*     1.3    76.8    -      -       -      +
    401A  ILE*     1.3    57.5    +      -       -      +
    403A  LYS*     3.9     5.4    -      -       -      +
    404A  VAL*     3.0    31.7    +      -       -      +
    495A  PHE*     4.7     5.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 401 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    397A  GLN      2.7    21.5    +      -       -      +
    398A  ASN*     3.7     8.1    -      -       -      +
    399A  HIS      3.3     0.2    -      -       -      -
    400A  LEU*     1.3    72.9    -      -       -      +
    402A  LEU*     1.3    57.1    +      -       -      +
    404A  VAL*     4.2     0.3    -      -       -      +
    405A  LEU*     2.9    34.5    +      -       -      +
    495A  PHE*     4.4    20.5    -      -       +      -
    554A  VAL*     6.0     5.6    -      -       +      -
    555A  TRP*     5.2    11.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 402 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    398A  ASN      2.8    17.7    +      -       -      +
    399A  HIS*     3.2     8.7    +      -       -      +
    401A  ILE*     1.3    76.8    -      -       -      +
    403A  LYS*     1.3    62.7    +      -       -      +
    405A  LEU*     4.0     4.0    -      -       -      +
    406A  VAL*     3.1    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 403 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  VAL*     6.0     6.5    -      -       +      -
    381A  ALA*     4.5    19.1    -      -       +      -
    399A  HIS      2.9    15.8    +      -       -      +
    400A  LEU*     3.9     6.1    -      -       -      +
    402A  LEU*     1.3    78.2    -      -       -      +
    404A  VAL*     1.3    61.5    +      -       -      +
    406A  VAL*     3.4     4.8    +      -       -      +
    407A  PHE*     3.1    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 404 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    378A  ARG*     6.4     2.7    -      -       +      -
    381A  ALA*     5.5     5.4    -      -       +      +
    400A  LEU      3.0    18.4    +      -       -      +
    401A  ILE      4.2     1.3    -      -       -      +
    403A  LYS*     1.3    73.8    -      -       -      +
    405A  LEU*     1.3    60.1    +      -       -      +
    407A  PHE*     4.0     5.9    -      -       -      +
    408A  ASN*     2.9    32.2    +      -       -      +
    495A  PHE*     3.6    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 405 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    401A  ILE      2.9    19.9    +      -       -      +
    402A  LEU*     4.0     4.3    -      -       -      +
    404A  VAL*     1.3    74.7    -      -       -      +
    406A  VAL*     1.3    61.8    +      -       -      +
    408A  ASN*     4.1     3.7    -      -       -      +
    409A  PHE*     2.9    32.7    +      -       -      +
    555A  TRP*     6.3     4.5    -      -       +      -
    558A  ALA*     6.1     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 406 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    402A  LEU      3.1    17.6    +      -       -      +
    403A  LYS*     3.7     6.1    -      -       -      +
    404A  VAL      3.3     0.2    -      -       -      -
    405A  LEU*     1.3    78.9    -      -       -      +
    407A  PHE*     1.3    61.0    +      -       -      +
    409A  PHE*     3.9     4.6    -      -       -      +
    410A  LEU*     3.1    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 407 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  CYS*     4.2    22.4    -      -       +      -
    326A  LEU*     5.2     3.8    -      -       +      -
    329A  SER*     4.1    24.9    -      -       -      -
    373A  MET*     3.4    42.0    -      -       +      -
    374A  ASN*     3.6    17.7    -      -       +      -
    377A  TYR*     3.6    21.5    -      -       +      -
    403A  LYS      3.1    16.7    +      -       -      +
    404A  VAL*     4.1     5.6    -      -       -      +
    406A  VAL*     1.3    77.0    -      -       -      +
    408A  ASN*     1.3    62.8    +      -       +      +
    410A  LEU*     3.8     5.5    -      -       +      +
    411A  ASN*     2.8    40.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 408 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    374A  ASN*     6.2     3.8    -      -       +      -
    404A  VAL      2.9    19.7    +      -       -      +
    405A  LEU*     4.1     4.5    -      -       -      +
    407A  PHE*     1.3    80.3    -      -       +      +
    409A  PHE*     1.3    60.7    +      -       -      +
    411A  ASN*     4.2     4.2    -      -       -      +
    412A  CYS*     3.0    32.7    +      -       -      +
    499A  LEU*     6.1     5.6    -      -       +      +
    503A  LEU*     6.3     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 409 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    405A  LEU      2.9    19.8    +      -       -      +
    406A  VAL*     3.9     4.9    -      -       -      +
    408A  ASN*     1.3    77.2    -      -       -      +
    410A  LEU*     1.3    58.0    +      -       -      +
    412A  CYS*     4.0     2.0    -      -       -      -
    413A  PHE*     2.9    36.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 410 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  LEU*     5.9     7.2    -      -       +      -
    329A  SER*     5.9     6.7    -      -       -      -
    406A  VAL      3.1    19.2    +      -       -      +
    407A  PHE*     3.8     7.9    -      -       +      +
    409A  PHE*     1.3    76.8    -      -       -      +
    411A  ASN*     1.3    62.5    +      -       -      +
    414A  ALA*     3.2    33.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 411 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  SER*     5.5     8.5    -      -       -      -
    370A  ILE*     4.8    23.8    -      -       +      +
    373A  MET*     6.2     0.9    -      -       +      -
    374A  ASN*     6.2     1.6    -      -       +      -
    407A  PHE*     2.8    41.6    +      -       +      +
    408A  ASN*     4.2     4.0    -      -       -      +
    410A  LEU*     1.3    73.4    -      -       -      +
    412A  CYS*     1.3    60.9    +      -       -      +
    414A  ALA*     4.8     2.3    +      -       -      +
    415A  SER      5.7     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 412 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    408A  ASN      3.0    18.9    +      -       -      +
    409A  PHE*     4.1     2.2    -      -       -      +
    411A  ASN*     1.3    81.3    -      -       -      +
    413A  PHE*     1.3    61.0    +      -       +      +
    414A  ALA      3.5     1.2    +      -       -      -
    415A  SER*     4.7     5.8    +      -       -      -
    416A  LEU*     4.9     5.0    +      -       -      +
    503A  LEU*     5.7     9.2    -      -       +      -
    506A  GLY*     6.6     0.2    -      -       -      -
    507A  TYR*     4.8    29.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 413 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  PHE*     2.9    17.9    +      -       +      +
    410A  LEU*     5.5     0.2    -      -       -      -
    412A  CYS*     1.3    75.6    -      -       +      +
    414A  ALA*     1.3    60.3    +      -       -      +
    415A  SER      3.4     2.0    -      -       -      -
    416A  LEU*     3.9    10.7    -      -       +      -
    417A  PHE*     3.0    29.3    +      -       -      +
    510A  LEU*     5.5    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 414 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  LEU*     6.3     1.3    -      -       -      -
    333A  MET*     4.9    17.0    -      -       +      -
    337A  PHE*     5.4     0.9    -      -       -      -
    410A  LEU*     3.2    22.1    +      -       +      +
    411A  ASN*     4.7     1.8    -      -       -      +
    412A  CYS      3.5     1.6    -      -       -      -
    413A  PHE*     1.3    76.9    -      -       -      +
    415A  SER*     1.3    59.1    +      -       -      +
    417A  PHE*     3.4     5.0    +      -       -      +
    418A  TYR*     2.8    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 415 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  MET*     5.9     1.9    -      -       -      +
    336A  TYR*     4.7    15.3    -      -       -      -
    337A  PHE*     4.1    25.0    -      -       -      -
    411A  ASN      5.7     0.4    +      -       -      -
    412A  CYS      4.7     4.4    +      -       -      -
    413A  PHE*     4.5     0.4    -      -       -      +
    414A  ALA*     1.3    78.4    -      -       -      +
    416A  LEU*     1.3    58.4    +      -       -      +
    418A  TYR*     3.8     0.7    -      -       -      +
    419A  ILE*     2.8    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 416 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  CYS      4.9     2.6    +      -       -      +
    413A  PHE*     3.5    16.3    +      -       +      +
    414A  ALA      3.3     0.6    -      -       -      -
    415A  SER*     1.3    77.4    -      -       -      +
    417A  PHE*     1.3    59.4    +      -       -      +
    419A  ILE*     4.0     5.0    -      -       -      +
    420A  ALA*     3.0    31.9    +      -       -      +
    433A  LEU*     6.3     2.7    -      -       +      -
    510A  LEU*     5.7     7.9    -      -       +      +
    511A  PHE*     5.5    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 417 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  PHE      3.0    18.7    +      -       -      +
    414A  ALA*     3.8     5.8    -      -       -      +
    416A  LEU*     1.3    79.3    -      -       -      +
    418A  TYR*     1.3    56.7    +      -       -      +
    420A  ALA*     4.5     3.1    -      -       -      +
    421A  PHE*     3.0    35.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 418 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  PHE*     3.6    30.5    -      -       +      -
    414A  ALA      2.8    19.0    +      -       -      +
    415A  SER      3.8     0.2    -      -       -      +
    417A  PHE*     1.3    75.6    -      -       -      +
    419A  ILE*     1.3    62.2    +      -       -      +
    422A  VAL*     3.3    16.8    +      -       +      +
    423A  LEU*     3.2    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 419 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  PHE*     4.8     6.0    -      -       +      -
    415A  SER      2.8    17.4    +      -       -      +
    416A  LEU*     4.0     6.5    -      -       -      +
    418A  TYR*     1.3    78.5    -      -       -      +
    420A  ALA*     1.3    56.9    +      -       -      +
    423A  LEU*     3.9     8.3    -      -       +      +
    424A  LYS*     2.9    29.8    +      -       -      -
    425A  ASP      3.8     6.7    +      -       -      +
    428A  LEU*     5.8     0.9    -      -       +      -
    429A  LEU*     4.5    24.4    -      -       +      +
    432A  SER*     5.9     5.2    -      -       -      -
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Residues in contact with ALA 420 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    416A  LEU      3.0    19.3    +      -       -      +
    417A  PHE*     4.2     3.1    -      -       -      +
    419A  ILE*     1.3    80.2    -      -       -      +
    421A  PHE*     1.3    59.7    +      -       +      +
    424A  LYS*     3.9    15.7    -      -       -      +
    429A  LEU*     5.8     3.6    -      -       +      -
    576A  MET*     5.3     8.1    -      -       -      +
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Residues in contact with PHE 421 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    417A  PHE*     3.0    16.7    +      -       +      +
    420A  ALA*     1.3    79.9    -      -       +      +
    422A  VAL*     1.3    60.1    +      -       -      +
    424A  LYS*     4.9     2.7    -      -       -      -
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Residues in contact with VAL 422 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    417A  PHE      4.1     0.2    +      -       -      -
    418A  TYR*     3.3    21.0    +      -       +      +
    421A  PHE*     1.3    79.9    -      -       -      +
    423A  LEU*     1.3    66.3    +      -       -      +
    424A  LYS*     3.4     2.6    -      -       -      +
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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
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  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) +   -    +    +   +   +    +    -
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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