Contacts of the helix formed by residues 394 - 417 (chain A) in PDB entry 1ZY7


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 HIS 394 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    374A  GLY      3.5     5.4    -      -       -      +
    375A  THR*     3.0    35.4    +      -       -      -
    376A  LYS*     3.5     6.3    -      -       -      -
    377A  CYS*     3.7    10.6    -      -       -      -
    392A  ASP*     3.1    19.1    +      -       -      +
    393A  CYS*     1.3    77.0    -      -       -      +
    395A  ALA*     1.3    67.0    +      -       -      +
    396A  GLU*     3.2     4.3    -      -       -      +
    397A  ILE*     3.0    14.3    +      -       +      +
    398A  ILE*     3.1    10.8    +      -       -      +
    451A  CYS*     3.5     9.0    -      -       +      -
    455A  ARG*     6.1     1.3    -      -       -      -
    483A  LYS*     3.3    23.0    -      -       +      +
    489A  GLY      5.9     1.3    -      -       -      -
    516A  CYS*     3.5    18.2    -      -       -      -
    801A   ZN      2.0    33.3    -      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    351A  VAL*     3.7    19.7    -      -       +      +
    353A  ALA*     3.6    16.6    -      -       +      -
    372A  SER*     2.5    23.6    +      -       -      +
    373A  THR*     3.5    35.4    -      -       -      -
    374A  GLY      2.8    12.8    +      -       -      +
    393A  CYS      3.3     0.6    +      -       -      -
    394A  HIS*     1.3    72.0    -      -       -      +
    396A  GLU*     1.3    59.7    +      -       -      +
    398A  ILE*     3.2     2.1    +      -       -      -
    399A  SER*     2.9    16.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 396 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    351A  VAL*     4.3     5.4    -      -       -      +
    353A  ALA*     3.7     8.0    -      -       -      +
    374A  GLY      4.8     0.3    -      -       -      +
    394A  HIS*     3.8     4.7    +      -       -      +
    395A  ALA*     1.3    88.6    +      -       -      +
    397A  ILE*     1.3    66.7    +      -       +      +
    399A  SER*     3.4     4.4    +      -       -      -
    400A  ARG      3.3    16.8    +      -       -      -
    444A  LEU*     4.7    10.8    -      -       +      +
    446A  ILE*     3.8    41.0    -      -       +      +
    450A  PRO*     3.4    27.9    -      -       -      +
    451A  CYS      4.2     0.2    +      -       -      -
    455A  ARG*     4.9     4.0    +      -       -      -
    516A  CYS*     3.5    30.6    -      -       +      +
    520A  ILE*     4.6     4.9    -      -       +      -
    523A  TRP*     3.7    11.0    -      -       +      -
    801A   ZN      3.8     3.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 397 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    392A  ASP*     3.5    38.8    -      -       -      +
    394A  HIS      3.0     7.5    +      -       -      +
    396A  GLU*     1.3    74.5    -      -       +      +
    398A  ILE*     1.3    65.0    +      -       -      +
    400A  ARG*     3.2     6.1    +      -       -      +
    401A  ARG*     3.2    22.1    +      -       -      +
    516A  CYS*     3.5    28.5    -      -       +      +
    519A  LYS*     3.5    26.9    -      -       +      -
    520A  ILE*     5.6     0.2    -      -       +      -
    523A  TRP*     3.7    23.3    -      -       +      -
    901A  IHP      3.6    35.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 398 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372A  SER*     3.6    13.9    -      -       -      -
    390A  LEU*     3.9    27.8    -      -       +      -
    392A  ASP      3.5    17.7    -      -       -      +
    393A  CYS*     3.7    19.5    -      -       -      +
    394A  HIS      3.1    11.9    +      -       -      +
    395A  ALA*     3.6     7.4    -      -       -      +
    397A  ILE*     1.3    77.1    -      -       -      +
    399A  SER*     1.3    55.8    +      -       -      +
    401A  ARG*     3.2    14.2    +      -       -      +
    402A  SER*     3.0    31.5    +      -       -      -
    599A  SER*     3.7    12.6    -      -       -      +
    600A  VAL      4.0     4.0    -      -       -      +
    601A  ASN*     3.5    32.3    -      -       +      +
    627A  LEU*     3.7     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 399 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    353A  ALA*     3.5     3.4    +      -       -      -
    354A  GLY*     3.3    29.4    -      -       -      -
    355A  VAL*     4.0    10.0    -      -       -      +
    370A  SER*     3.1    21.1    +      -       -      -
    371A  VAL      4.0     0.2    -      -       -      -
    372A  SER*     2.6    26.8    +      -       -      -
    395A  ALA      2.9    10.6    +      -       -      -
    396A  GLU*     3.7     6.3    -      -       -      -
    397A  ILE      3.3     0.2    -      -       -      -
    398A  ILE*     1.3    75.6    -      -       -      +
    400A  ARG*     1.3    57.9    +      -       -      +
    402A  SER*     3.4     3.2    +      -       -      -
    403A  LEU*     3.0    25.5    +      -       -      +
    444A  LEU*     4.7     2.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 400 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    355A  VAL*     4.8     2.6    -      -       -      +
    396A  GLU      3.3     3.0    +      -       -      +
    397A  ILE      3.2     8.2    +      -       -      +
    399A  SER*     1.3    77.0    -      -       -      +
    401A  ARG*     1.3    68.8    +      -       -      +
    403A  LEU*     3.0    13.3    +      -       +      +
    404A  LEU*     3.0    46.2    +      -       +      +
    444A  LEU*     5.7     0.6    -      -       -      +
    523A  TRP*     3.3    58.6    -      -       +      +
    527A  GLY      5.5     0.2    +      -       -      -
    528A  ILE*     2.9    42.0    +      -       +      +
    530A  GLY*     3.9    15.4    -      -       -      +
    542A  PHE*     5.1     3.8    -      -       +      -
    901A  IHP      3.0    50.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 401 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    390A  LEU*     3.7    19.2    -      -       -      +
    391A  ASN      6.3     0.2    -      -       -      -
    392A  ASP      5.2     1.1    -      -       -      -
    397A  ILE*     3.2    15.2    +      -       -      +
    398A  ILE*     3.2    20.4    +      -       -      +
    400A  ARG*     1.3    80.7    -      -       -      +
    402A  SER*     1.3    62.8    +      -       -      +
    404A  LEU*     3.0    28.1    +      -       +      +
    405A  ARG*     3.4     5.4    +      -       -      +
    627A  LEU*     2.9    49.6    +      -       +      +
    628A  CYS*     3.9     1.2    -      -       -      +
    629A  LYS*     3.6    15.6    -      -       -      +
    632A  LEU*     3.5    20.6    -      -       +      +
    901A  IHP      2.7    81.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 402 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370A  SER*     3.3    23.8    -      -       -      -
    371A  VAL      4.8     1.3    +      -       -      -
    398A  ILE      3.0    16.7    +      -       -      -
    399A  SER*     3.6     1.3    -      -       -      -
    401A  ARG*     1.3    74.2    -      -       -      +
    403A  LEU*     1.3    64.2    +      -       -      +
    405A  ARG*     3.2    11.0    +      -       -      +
    601A  ASN*     3.8    13.5    -      -       -      +
    602A  TRP      3.8     4.2    +      -       -      -
    603A  THR*     3.1    39.7    +      -       -      +
    627A  LEU*     3.6    21.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 403 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    355A  VAL*     4.3    10.3    -      -       +      -
    369A  ILE*     3.8    22.0    -      -       +      -
    370A  SER*     4.2     0.8    -      -       -      -
    399A  SER      3.0    14.0    +      -       -      +
    400A  ARG*     3.0    13.4    +      -       +      +
    402A  SER*     1.3    76.1    -      -       -      +
    404A  LEU*     1.3    63.5    +      -       +      +
    406A  PHE*     3.0     9.7    +      -       +      +
    407A  LEU*     2.9    31.1    +      -       +      +
    442A  PHE*     3.7    32.8    -      -       +      -
    528A  ILE*     3.2    39.5    -      -       +      +
    542A  PHE*     4.1    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 404 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    400A  ARG*     3.0    39.5    +      -       +      +
    401A  ARG*     3.0    14.5    +      -       +      +
    403A  LEU*     1.3    77.1    -      -       +      +
    405A  ARG*     1.3    62.1    +      -       -      +
    407A  LEU*     3.1    11.6    +      -       +      +
    408A  TYR*     2.9    32.1    +      -       +      -
    528A  ILE      3.4    25.4    -      -       -      +
    529A  GLN*     3.5    23.6    -      -       -      +
    530A  GLY*     5.7     0.9    -      -       -      -
    533A  LEU*     4.0    10.5    -      -       +      +
    632A  LEU*     4.0    29.4    -      -       +      -
    901A  IHP      5.2     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 405 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    401A  ARG      3.4     3.1    +      -       -      +
    402A  SER      3.2     8.8    +      -       -      +
    404A  LEU*     1.3    76.3    -      -       -      +
    406A  PHE*     1.3    57.0    +      -       -      +
    408A  TYR*     3.3     9.5    +      -       -      +
    409A  THR*     2.9    33.6    +      -       -      -
    601A  ASN*     4.9     0.6    +      -       -      -
    603A  THR*     3.2    20.6    +      -       +      +
    606A  ASP*     2.8    43.8    +      -       -      -
    626A  ARG*     3.5    49.9    +      -       -      +
    627A  LEU*     3.6    16.6    -      -       -      +
    632A  LEU*     4.0    18.4    -      -       +      -
    635A  ARG*     3.8    23.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 406 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357A  MET*     3.9    14.4    -      -       +      -
    367A  LYS*     4.4     9.0    -      -       -      -
    369A  ILE*     3.6    48.5    -      -       +      -
    402A  SER      3.3     2.4    +      -       -      -
    403A  LEU*     3.0    17.5    +      -       +      +
    405A  ARG*     1.3    76.9    -      -       -      +
    407A  LEU*     1.3    62.2    +      -       +      +
    409A  THR*     3.2    11.1    +      -       +      -
    410A  GLN*     2.9    66.7    +      -       +      +
    425A  ILE*     3.9    11.2    -      -       +      -
    442A  PHE*     3.9    15.3    -      +       -      -
    603A  THR*     3.8    12.9    -      -       +      +
    604A  VAL*     3.5    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 407 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    403A  LEU*     2.9    28.5    +      -       +      +
    404A  LEU*     3.1    12.3    +      -       +      +
    406A  PHE*     1.3    79.8    -      -       +      +
    408A  TYR*     1.3    62.4    +      -       -      +
    410A  GLN*     3.2     5.4    +      -       -      +
    411A  LEU*     2.9    29.1    +      -       -      +
    425A  ILE*     4.2     8.7    -      -       +      -
    426A  PHE*     3.7    21.5    -      -       +      -
    442A  PHE*     4.1    25.6    -      -       +      -
    528A  ILE*     5.3     1.6    -      -       +      -
    529A  GLN*     4.1    22.0    -      -       +      -
    533A  LEU*     4.0    17.7    -      -       +      -
    537A  VAL*     5.7     0.7    -      -       +      -
    540A  ILE*     3.9    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 408 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    404A  LEU*     2.9    29.8    +      -       +      -
    405A  ARG*     3.6     6.7    -      -       -      +
    407A  LEU*     1.3    73.7    -      -       -      +
    409A  THR*     1.3    64.1    +      -       -      +
    411A  LEU*     3.2     6.8    +      -       +      +
    412A  GLU*     2.9    26.5    +      -       -      +
    532A  LEU*     3.9    10.7    -      -       -      +
    533A  LEU*     3.5    38.1    -      -       +      +
    536A  PHE*     4.5     2.7    -      +       -      -
    632A  LEU*     3.9    29.7    +      -       +      +
    635A  ARG*     3.5    36.1    -      -       +      +
    636A  TRP*     3.5    46.3    -      +       +      +
    639A  VAL*     4.0    19.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 409 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    405A  ARG      2.9    12.4    +      -       -      -
    406A  PHE*     3.2    14.1    +      -       +      -
    408A  TYR*     1.3    76.0    -      -       -      +
    410A  GLN*     1.3    65.6    +      -       -      +
    412A  GLU*     3.2     8.1    +      -       +      +
    413A  LEU*     2.9    37.5    +      -       +      +
    635A  ARG*     2.9    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 410 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367A  LYS*     5.2     4.8    -      -       -      +
    406A  PHE*     2.9    60.1    +      -       +      +
    407A  LEU*     3.6     5.6    -      -       -      +
    409A  THR*     1.3    78.1    -      -       -      +
    411A  LEU*     1.3    63.9    +      -       -      +
    413A  LEU*     3.5    22.0    +      -       -      +
    414A  TYR      3.1     8.8    +      -       -      -
    423A  ARG      3.6     3.1    +      -       -      +
    424A  SER*     2.7    32.6    +      -       -      -
    425A  ILE*     2.8    37.8    +      -       +      +
    426A  PHE*     3.9    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 411 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    407A  LEU      2.9    15.5    +      -       -      +
    408A  TYR*     3.6     9.6    -      -       +      +
    410A  GLN*     1.3    72.3    -      -       -      +
    412A  GLU*     1.3    61.7    +      -       -      +
    414A  TYR*     3.2     6.2    +      -       +      +
    415A  LEU*     2.9    36.0    +      -       +      +
    426A  PHE*     3.7    20.0    -      -       +      -
    434A  PHE*     3.7    27.4    -      -       +      -
    533A  LEU*     3.6    31.4    -      -       +      -
    536A  PHE*     4.0    17.9    -      -       +      -
    537A  VAL*     3.6    27.8    -      -       +      -
    639A  VAL*     4.5    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 412 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    408A  TYR      2.9    14.5    +      -       -      +
    409A  THR*     3.2     9.3    +      -       -      +
    411A  LEU*     1.3    75.5    -      -       -      +
    413A  LEU*     1.3    55.9    +      -       -      +
    415A  LEU*     3.1     8.3    +      -       +      +
    416A  ASN*     2.8    47.6    +      -       -      +
    635A  ARG*     3.2    18.3    +      -       -      +
    638A  ARG*     2.7    58.8    +      -       -      +
    639A  VAL*     3.8    19.3    +      -       +      +
    642A  LYS*     5.8     4.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 413 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409A  THR*     2.9    22.9    +      -       +      +
    410A  GLN*     3.5    40.6    -      -       -      +
    411A  LEU      3.3     0.2    -      -       -      -
    412A  GLU*     1.3    76.9    -      -       -      +
    414A  TYR*     1.3    63.3    +      -       -      +
    415A  LEU      3.4     0.2    +      -       -      -
    416A  ASN*     3.5     9.2    +      -       -      +
    417A  ASN      3.9     0.5    -      -       -      +
    420A  ASP*     3.3    46.5    -      -       +      +
    421A  GLN      3.2    18.9    +      -       -      -
    423A  ARG*     4.2    22.2    -      -       +      +
    424A  SER*     4.0     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 414 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    410A  GLN      3.1     6.2    +      -       -      +
    411A  LEU*     3.2    12.1    +      -       +      +
    413A  LEU*     1.3    79.4    -      -       -      +
    415A  LEU*     1.3    71.7    +      -       +      +
    416A  ASN      3.7     0.2    +      -       -      -
    417A  ASN      4.2     1.9    +      -       -      +
    421A  GLN*     3.0    67.0    +      -       +      +
    424A  SER*     3.6    17.2    -      -       -      +
    426A  PHE*     3.4    30.3    -      -       +      -
    427A  GLN*     4.0    12.3    -      -       -      -
    428A  LYS*     3.2    36.8    +      -       -      +
    434A  PHE*     3.5    30.3    -      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 415 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    411A  LEU*     2.9    25.4    +      -       +      +
    412A  GLU*     3.1     6.9    +      -       +      +
    414A  TYR*     1.3    87.1    -      -       +      +
    416A  ASN*     1.3    64.8    +      -       -      +
    417A  ASN*     3.5     0.7    +      -       -      -
    434A  PHE*     4.0    26.2    -      -       +      -
    639A  VAL*     3.9    17.5    -      -       +      -
    642A  LYS*     3.4    46.2    +      -       +      +
    643A  VAL*     3.8    25.6    -      -       +      -
    644A  PRO*     5.0     4.3    -      -       +      -
    647A  LEU*     6.3     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 416 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    412A  GLU*     2.8    39.8    +      -       -      +
    413A  LEU*     3.9     9.0    -      -       -      +
    414A  TYR      3.5     1.2    -      -       -      -
    415A  LEU*     1.3    76.4    -      -       -      +
    417A  ASN*     1.3    71.2    +      -       -      +
    420A  ASP*     2.9    27.4    +      -       -      +
    642A  LYS*     4.3    13.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 417 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413A  LEU      3.9     0.2    -      -       -      +
    414A  TYR      4.2     1.7    -      -       -      +
    415A  LEU      3.5     2.3    -      -       -      -
    416A  ASN*     1.3    92.6    -      -       -      +
    418A  LYS*     1.3    59.6    +      -       +      +
    419A  ASP*     2.8    17.7    +      -       -      +
    420A  ASP*     2.8    39.2    +      -       -      -
    421A  GLN*     2.9    31.5    +      -       -      +
----------------------------------------------------------
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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