Contacts of the helix formed by residues 396 - 422 (chain A) in PDB entry 4IE6


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 TRP 396 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  GLY*     3.5    41.5    -      -       -      -
    104A  CYS      3.9     9.0    -      -       -      -
    105A  THR*     4.0     5.6    -      -       +      -
    114A  PHE*     3.5    43.7    -      +       +      +
    115A  THR*     2.9    27.0    +      -       -      -
    331A  LEU*     4.2    12.6    -      -       +      -
    378A  TRP*     3.9    13.5    -      +       -      -
    382A  PHE*     3.5    25.6    -      +       +      -
    389A  TYR*     5.5     7.2    -      -       +      -
    393A  THR*     4.8     8.0    -      -       +      +
    394A  ASP      3.1     0.8    -      -       -      -
    395A  TRP*     1.3    98.4    -      +       +      +
    397A  CYS*     1.3    59.3    +      -       -      +
    399A  PRO*     3.4    15.0    -      -       +      +
    400A  MET*     2.8    45.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 397 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    382A  PHE*     5.1     4.7    -      -       -      -
    383A  TRP*     6.5     0.4    -      -       -      -
    387A  ASN*     5.9     4.9    -      -       -      -
    394A  ASP*     3.0    24.4    +      -       +      +
    396A  TRP*     1.3    78.6    -      -       -      +
    398A  GLN*     1.3    59.8    +      -       -      +
    400A  MET*     3.9     3.3    -      -       -      +
    401A  ALA*     3.1    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 398 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    394A  ASP      4.4     0.8    +      -       -      -
    395A  TRP      4.4     0.4    +      -       -      -
    397A  CYS*     1.3    76.5    -      -       -      +
    399A  PRO*     1.3    92.9    -      -       +      +
    400A  MET      3.0     0.2    +      -       -      -
    401A  ALA*     3.1     8.1    +      -       +      +
    402A  GLN*     2.9    49.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 399 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  LEU*     3.6    38.3    -      -       +      +
    335A  LEU*     6.4     0.2    -      -       +      -
    395A  TRP*     2.8    35.0    -      -       +      +
    396A  TRP*     3.4    18.2    -      -       +      +
    398A  GLN*     1.3   103.1    -      -       +      +
    400A  MET*     1.3    56.0    +      -       -      +
    402A  GLN*     3.3     7.4    +      -       +      +
    403A  LEU*     3.0    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 400 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  PHE*     3.3    36.1    -      -       +      -
    378A  TRP*     4.1    19.1    -      -       +      +
    379A  LEU*     3.9    23.6    -      -       -      +
    382A  PHE*     3.6    48.9    -      -       +      -
    383A  TRP*     4.8    11.0    -      -       +      +
    396A  TRP*     2.8    33.0    +      -       +      +
    397A  CYS*     4.0     3.6    -      -       -      +
    399A  PRO*     1.3    71.3    -      -       -      +
    401A  ALA*     1.3    60.8    +      -       -      +
    402A  GLN      3.2     1.3    -      -       -      -
    403A  LEU*     3.9    11.6    -      -       +      +
    404A  GLU*     2.9    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 401 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    397A  CYS*     3.1    15.5    +      -       -      +
    398A  GLN*     3.5    13.0    -      -       +      +
    400A  MET*     1.3    78.7    -      -       -      +
    402A  GLN*     1.3    56.6    +      -       -      +
    404A  GLU*     3.3     7.2    +      -       -      +
    405A  ALA*     3.0    28.2    +      -       -      +
    473A  ARG*     5.8     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 402 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  LEU*     3.8    33.7    -      -       +      +
    398A  GLN*     2.9    39.6    +      -       -      +
    399A  PRO*     3.7     5.9    -      -       -      +
    401A  ALA*     1.3    78.7    -      -       -      +
    403A  LEU*     1.3    58.9    +      -       -      +
    405A  ALA*     3.4     6.1    +      -       -      +
    406A  LEU*     3.0    40.4    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    331A  LEU*     3.9    17.0    -      -       +      -
    334A  ILE*     4.1    22.2    -      -       +      +
    335A  LEU*     3.6    26.9    -      -       +      -
    338A  CYS*     4.2    19.3    -      -       -      -
    374A  VAL*     3.9    13.2    -      -       +      +
    378A  TRP*     4.5     9.4    -      -       +      -
    379A  LEU*     4.0    10.4    -      -       +      +
    399A  PRO*     3.0    22.2    +      -       +      +
    400A  MET*     4.0    28.7    -      -       +      +
    402A  GLN*     1.3    74.6    -      -       -      +
    404A  GLU*     1.3    59.0    +      -       -      +
    406A  LEU*     3.9     4.9    -      -       +      +
    407A  TRP*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 404 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    379A  LEU*     3.8    17.9    -      -       +      +
    383A  TRP*     4.2     7.3    +      -       -      -
    400A  MET      2.9    19.1    +      -       -      +
    401A  ALA*     3.6     7.2    -      -       -      +
    402A  GLN      3.2     0.2    -      -       -      -
    403A  LEU*     1.3    75.9    -      -       -      +
    405A  ALA*     1.3    58.4    +      -       -      +
    407A  TRP*     3.3    15.5    +      -       +      +
    408A  LYS*     2.9    25.3    +      -       +      +
    473A  ARG*     2.8    46.2    +      -       -      +
    474A  PRO*     4.1    18.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 405 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    401A  ALA      3.0    16.4    +      -       -      +
    402A  GLN*     3.7     7.4    -      -       -      +
    404A  GLU*     1.3    74.4    -      -       -      +
    406A  LEU*     1.3    65.9    +      -       +      +
    408A  LYS*     3.2     7.8    +      -       -      +
    409A  LYS*     3.1    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 406 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  LEU*     4.0    24.9    -      -       +      +
    338A  CYS*     3.8    35.7    -      -       +      -
    339A  GLN*     5.5     0.9    -      -       -      +
    342A  LEU*     3.5    26.0    -      -       +      +
    402A  GLN*     3.0    34.2    +      -       +      +
    403A  LEU*     3.9     5.8    -      -       -      +
    405A  ALA*     1.3    77.2    -      -       +      +
    407A  TRP*     1.3    62.1    +      -       -      +
    409A  LYS*     3.4     7.4    +      -       -      +
    410A  MET*     3.1    29.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 407 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371A  HIS*     3.3    23.9    +      +       -      -
    374A  VAL*     4.1    12.5    -      -       +      +
    375A  GLU*     2.8    43.0    +      -       +      -
    379A  LEU*     3.6    10.8    -      -       +      -
    403A  LEU      3.0    19.0    +      -       -      +
    404A  GLU*     3.4    14.4    -      -       +      +
    406A  LEU*     1.3    74.1    -      -       -      +
    408A  LYS*     1.3    78.4    +      -       +      +
    410A  MET*     3.0    13.3    +      -       -      +
    411A  GLU*     2.9    50.8    +      -       +      -
    449A  ARG*     4.0     0.9    -      -       -      -
    474A  PRO*     3.5    35.0    -      -       +      -
    476A  TRP*     3.4    31.6    -      +       -      -
    483A  MET*     3.8    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 408 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    404A  GLU*     2.9    15.5    +      -       +      +
    405A  ALA*     3.2    11.4    +      -       -      +
    407A  TRP*     1.3    82.2    -      -       +      +
    409A  LYS*     1.3    67.7    +      -       -      +
    411A  GLU*     3.1     7.3    +      -       +      +
    412A  GLY*     3.0    16.6    +      -       -      -
    482A  SER      5.7     1.8    -      -       -      +
    483A  MET*     4.2    27.4    -      -       +      -
    484A  PRO*     5.3     5.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 409 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  LEU*     3.7    31.2    -      -       +      -
    345A  VAL*     4.7    12.6    -      -       +      -
    349A  VAL      5.1     1.9    +      -       -      -
    350A  ASP*     3.0    28.4    +      -       -      +
    351A  ASN      2.7    33.5    +      -       -      +
    354A  VAL*     3.7    25.4    -      -       +      +
    405A  ALA      3.1    12.2    +      -       -      +
    406A  LEU*     3.5     9.6    -      -       -      +
    408A  LYS*     1.3    74.4    -      -       -      +
    410A  MET*     1.3    54.5    +      -       -      +
    412A  GLY*     2.7    23.9    +      -       -      -
    413A  VAL*     2.9    12.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 410 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  CYS*     3.7    52.3    -      -       +      +
    341A  ALA*     4.1     8.5    -      -       +      -
    342A  LEU*     4.1    15.9    -      -       +      -
    367A  GLY      4.9     1.3    -      -       -      +
    370A  ILE*     4.1     7.9    -      -       +      -
    371A  HIS*     3.5    46.3    +      -       +      +
    374A  VAL*     4.2    11.0    -      -       -      -
    406A  LEU*     3.1    17.8    +      -       +      +
    407A  TRP*     3.0     8.8    +      -       -      +
    409A  LYS*     1.3    72.6    -      -       -      +
    411A  GLU*     1.3    67.1    +      -       -      +
    413A  VAL*     2.9    20.5    +      -       +      +
    414A  THR*     3.0    17.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 411 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371A  HIS*     2.6    30.6    +      -       -      -
    407A  TRP*     2.9    39.3    +      -       +      +
    408A  LYS      3.1     7.8    +      -       -      +
    410A  MET*     1.3    73.3    -      -       -      +
    412A  GLY*     1.3    62.9    +      -       -      +
    414A  THR*     4.7     0.7    -      -       -      -
    415A  ASN*     3.1    23.0    +      -       -      +
    445A  ARG*     4.5     3.2    +      -       -      -
    449A  ARG*     2.9    28.5    +      -       -      -
    476A  TRP*     3.7    15.7    -      -       -      -
    483A  MET*     3.9    10.7    -      -       +      +
    484A  PRO*     4.0    16.4    -      -       +      +
    485A  LEU*     3.5    26.0    -      -       +      +
    489A  LEU*     5.4     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 412 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354A  VAL*     4.1    22.6    -      -       -      +
    408A  LYS      3.0     7.6    +      -       -      -
    409A  LYS*     2.7    11.3    +      -       -      -
    411A  GLU*     1.3    77.4    -      -       -      +
    413A  VAL*     1.3    60.5    -      -       -      -
    415A  ASN*     3.3     8.3    +      -       -      +
    416A  ALA*     3.0    20.6    +      -       -      +
    484A  PRO*     4.2    11.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 413 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  ALA      5.5     3.1    -      -       -      +
    342A  LEU*     4.5     7.4    -      -       +      -
    344A  ASN*     5.5     3.1    -      -       +      +
    345A  VAL*     3.3    33.4    -      -       +      -
    354A  VAL*     4.0     8.5    -      -       +      +
    356A  LEU*     3.7    21.1    -      -       +      -
    364A  LEU*     5.5     2.9    -      -       +      -
    367A  GLY*     5.9     7.0    -      -       -      -
    368A  GLU*     4.0    12.8    -      -       -      +
    409A  LYS      2.9    15.5    +      -       -      +
    410A  MET*     2.9    16.4    +      -       +      +
    412A  GLY*     1.3    70.0    -      -       -      +
    414A  THR*     1.3    68.8    +      -       -      +
    416A  ALA*     2.9    15.3    +      -       -      +
    417A  VAL*     2.9    15.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 414 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    368A  GLU*     2.8    32.9    +      -       -      +
    371A  HIS*     3.1    12.8    +      -       -      -
    410A  MET      3.0     7.5    +      -       -      -
    411A  GLU      3.9     0.7    -      -       -      -
    413A  VAL*     1.3    74.5    -      -       -      +
    415A  ASN*     1.3    64.2    +      -       -      +
    417A  VAL*     2.9     6.7    +      -       +      +
    418A  LEU*     2.9    33.6    +      -       +      +
    438A  ILE*     6.4     1.3    -      -       +      -
    442A  LEU*     6.2     2.9    -      -       +      -
    445A  ARG*     3.1    23.2    +      -       -      +
    485A  LEU*     3.7    19.5    -      -       +      -
    489A  LEU*     6.5     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 415 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  ASP      5.8     2.0    +      -       -      -
    411A  GLU      3.1    11.9    +      -       -      +
    412A  GLY*     3.3    10.5    +      -       -      +
    414A  THR*     1.3    77.5    -      -       -      +
    416A  ALA*     1.3    63.4    +      -       -      +
    418A  LEU*     2.9    13.6    +      -       -      +
    419A  HIS*     3.0    43.0    +      -       -      -
    484A  PRO*     3.8    29.4    +      -       +      +
    485A  LEU*     3.4    25.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 416 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354A  VAL      3.7    22.7    -      -       -      +
    355A  SER*     5.3     0.2    -      -       -      -
    356A  LEU*     3.7    23.8    -      -       +      +
    359A  PHE*     4.4     3.4    -      -       +      -
    412A  GLY      3.0    11.4    +      -       -      +
    413A  VAL*     2.9    13.4    +      -       -      +
    415A  ASN*     1.3    72.6    -      -       -      +
    417A  VAL*     1.3    62.3    +      -       -      +
    419A  HIS*     3.3    10.0    +      -       -      +
    420A  GLU*     3.0    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 417 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    356A  LEU*     3.6    11.0    -      -       +      -
    359A  PHE*     4.5     2.9    -      -       +      -
    364A  LEU*     3.5    35.4    -      -       +      -
    368A  GLU*     4.4     9.6    -      -       +      +
    413A  VAL*     2.9    24.8    +      -       +      +
    414A  THR*     2.9     8.7    +      -       +      +
    416A  ALA*     1.3    75.2    -      -       -      +
    418A  LEU*     1.3    63.4    +      -       +      +
    420A  GLU*     3.3     7.6    +      -       +      +
    421A  VAL*     3.0    21.8    +      -       +      +
    434A  ILE*     3.8    26.7    -      -       +      -
    438A  ILE*     4.0    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 418 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    414A  THR*     2.9    26.2    +      -       +      +
    415A  ASN*     2.9     9.1    +      -       -      +
    417A  VAL*     1.3    80.3    -      -       +      +
    419A  HIS*     1.3    65.1    +      -       +      +
    421A  VAL*     3.5    11.6    +      -       +      +
    422A  LYS*     3.4    30.3    +      -       +      +
    435A  LEU*     6.0     2.2    -      -       +      -
    438A  ILE*     4.6    19.1    -      -       +      -
    485A  LEU*     3.7    28.0    -      -       +      -
    492A  ILE*     4.6    21.5    -      -       +      +
    496A  LEU*     6.2     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 419 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    415A  ASN*     3.0    42.5    +      -       -      +
    416A  ALA*     3.7    10.8    -      -       -      +
    418A  LEU*     1.3    77.7    +      -       +      +
    420A  GLU*     1.3    64.9    +      -       -      +
    422A  LYS*     3.1    20.9    +      -       -      +
    423A  ARG*     3.4    10.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 420 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    359A  PHE*     3.3    59.2    -      -       +      +
    416A  ALA      3.0     7.2    +      -       -      +
    417A  VAL      3.5     7.2    -      -       -      +
    419A  HIS*     1.3    77.3    -      -       -      +
    421A  VAL*     1.3    63.2    +      -       -      +
    423A  ARG*     2.9    61.1    +      -       -      +
    426A  LEU*     3.4    17.7    -      -       +      +
    434A  ILE*     4.3    12.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 421 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417A  VAL*     3.0    18.8    +      -       +      +
    418A  LEU*     3.8    13.5    -      -       +      +
    419A  HIS      3.3     0.2    -      -       -      -
    420A  GLU*     1.3    75.6    -      -       -      +
    422A  LYS*     1.3    59.5    +      -       +      +
    423A  ARG      3.3     3.7    +      -       -      +
    426A  LEU*     4.1     9.7    -      -       -      +
    431A  ARG*     3.7    27.6    -      -       +      +
    434A  ILE*     3.3    40.4    -      -       +      -
    435A  LEU*     3.8    28.0    -      -       +      -
    438A  ILE*     5.0     2.9    -      -       +      -
    499A  GLN*     4.3    17.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 422 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418A  LEU*     3.4    15.7    +      -       -      +
    419A  HIS*     3.1    15.6    +      -       -      +
    420A  GLU      3.1     1.0    -      -       -      -
    421A  VAL*     1.3    82.9    -      -       +      +
    423A  ARG*     1.3    60.7    +      -       -      +
    424A  GLU*     3.8     1.4    +      -       -      -
    495A  GLU*     4.1    25.8    +      -       -      -
    499A  GLN*     5.3     7.4    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il