Contacts of the helix formed by residues 324 - 352 (chain A) in PDB entry 2Z1Z


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 THR 324 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  VAL*     4.8     0.2    -      -       -      +
    320A  LEU      3.7    10.5    -      -       -      +
    321A  ALA*     2.6    30.3    +      -       -      +
    322A  CYS      3.1     0.2    +      -       -      -
    323A  LEU*     1.3    80.3    -      -       -      +
    325A  PRO*     1.3    77.2    -      -       +      +
    326A  GLU*     3.4    20.6    +      -       -      +
    327A  GLY      2.8    17.5    +      -       -      -
    328A  LEU*     2.9    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 325 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  THR*     1.3    82.5    -      -       +      +
    326A  GLU*     1.3    67.2    +      -       +      +
    328A  LEU*     3.8     7.2    -      -       +      +
    329A  GLU*     2.8    35.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  VAL*     3.9    25.8    -      -       +      +
    324A  THR*     3.4    21.2    +      -       -      +
    325A  PRO*     1.3    94.3    -      -       +      +
    327A  GLY*     1.3    61.6    +      -       -      +
    329A  GLU*     3.4    11.6    +      -       -      +
    330A  ALA*     2.9    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  VAL*     4.1    12.5    -      -       -      +
     74A  ILE*     4.3     1.6    -      -       -      +
    321A  ALA      3.3    21.3    -      -       -      -
    322A  CYS*     3.3    12.6    -      -       -      -
    324A  THR*     2.8    11.1    +      -       -      -
    326A  GLU*     1.3    76.0    -      -       -      +
    328A  LEU*     1.3    56.1    -      -       -      +
    330A  ALA*     3.2     4.9    +      -       -      +
    331A  MET*     3.0    33.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  THR*     4.5    19.3    -      -       +      -
    111A  PHE*     5.3     3.4    -      -       +      -
    322A  CYS      3.1    15.2    +      -       -      +
    323A  LEU*     4.2    17.0    -      -       +      -
    324A  THR      2.9    26.2    +      -       -      +
    325A  PRO*     3.8     5.6    -      -       +      +
    327A  GLY*     1.3    73.4    -      -       -      +
    329A  GLU*     1.3    65.6    +      -       -      +
    331A  MET*     3.9    21.0    -      -       +      +
    332A  HIS*     2.9    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  PRO      2.8    23.5    +      -       -      +
    326A  GLU*     3.6    11.1    -      -       -      +
    328A  LEU*     1.3    75.7    -      -       -      +
    330A  ALA*     1.3    62.7    +      -       -      +
    332A  HIS*     3.4     5.3    +      -       +      +
    333A  LYS*     3.2    51.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 330 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  PRO*     3.4    32.3    -      -       +      +
     73A  VAL*     3.7    11.2    -      -       +      -
     74A  ILE*     5.3     0.4    -      -       +      -
    326A  GLU      2.9    20.1    +      -       -      +
    327A  GLY      3.2     5.4    +      -       -      +
    329A  GLU*     1.3    72.5    -      -       -      +
    331A  MET*     1.3    58.6    +      -       +      +
    333A  LYS*     3.2    10.8    +      -       -      +
    334A  VAL*     3.1    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 331 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  PRO*     5.4     3.4    -      -       +      -
     74A  ILE*     5.4     2.9    -      -       +      -
    111A  PHE*     5.3     5.4    -      -       +      -
    242A  MET*     5.4     3.6    -      -       +      -
    268A  PHE*     4.4     7.2    -      -       +      -
    271A  TYR*     3.8    40.6    -      -       +      +
    272A  ALA*     4.1    16.4    -      -       +      -
    322A  CYS*     3.9    32.1    -      -       -      +
    327A  GLY      3.0    15.2    +      -       -      +
    328A  LEU*     3.9    25.4    -      -       +      +
    330A  ALA*     1.3    74.6    -      -       +      +
    332A  HIS*     1.3    60.6    +      -       -      +
    334A  VAL*     3.3     4.9    +      -       -      +
    335A  ILE*     2.8    41.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328A  LEU      2.9    19.2    +      -       -      +
    329A  GLU*     3.7     7.6    +      -       -      +
    331A  MET*     1.3    75.5    -      -       -      +
    333A  LYS*     1.3    62.6    +      -       -      +
    335A  ILE*     3.4    12.3    +      -       +      +
    336A  GLY*     2.9    28.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  GLU*     3.2    53.9    +      -       +      +
    330A  ALA*     3.3    13.2    -      -       -      +
    331A  MET      3.2     0.2    -      -       -      -
    332A  HIS*     1.3    80.4    -      -       -      +
    334A  VAL*     1.3    60.7    +      -       +      +
    336A  GLY*     3.0     4.4    +      -       -      -
    337A  PHE*     2.9    28.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  GLU*     5.4     8.7    -      -       +      -
     69A  PRO      5.1     5.6    -      -       -      +
     71A  PRO*     4.1    22.9    -      -       +      -
    270A  LYS      5.1     1.6    -      -       -      +
    271A  TYR      3.7    23.8    -      -       -      +
    272A  ALA      5.3     5.8    -      -       -      -
    273A  GLY*     5.4     1.6    -      -       -      +
    330A  ALA      3.1    16.6    +      -       -      +
    331A  MET*     4.0     2.2    -      -       -      +
    333A  LYS*     1.3    75.6    -      -       +      +
    335A  ILE*     1.3    67.5    +      -       +      +
    337A  PHE*     3.3     8.7    +      -       +      +
    338A  TYR*     3.2    46.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242A  MET*     3.5    46.9    -      -       +      +
    243A  TYR*     3.9    32.1    -      -       +      +
    271A  TYR*     4.4    22.2    -      -       +      +
    331A  MET*     2.8    31.2    +      -       +      +
    332A  HIS*     3.8    10.1    -      -       +      +
    334A  VAL*     1.3    74.9    -      -       +      +
    336A  GLY*     1.3    62.8    +      -       -      +
    338A  TYR*     3.3     2.9    +      -       -      +
    339A  LYS*     3.1    47.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332A  HIS*     2.9    18.2    +      -       -      -
    333A  LYS*     3.0     5.1    +      -       -      -
    335A  ILE*     1.3    77.9    -      -       -      +
    337A  PHE*     1.3    61.1    +      -       -      +
    339A  LYS*     3.6    10.7    +      -       -      +
    340A  GLU*     3.2    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  GLU*     3.7    34.3    -      -       +      -
    333A  LYS      2.9    15.4    +      -       -      +
    334A  VAL*     3.3    11.2    +      -       -      +
    336A  GLY*     1.3    70.7    -      -       -      +
    338A  TYR*     1.3    80.4    +      +       -      +
    340A  GLU*     3.1    15.8    +      -       -      +
    341A  ASN*     3.1    31.1    +      -       -      +
    409A  GLY      3.4    18.8    -      -       -      -
    411A  ARG*     3.4    50.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  THR*     3.9    11.6    -      -       +      -
     67A  THR*     3.1    13.0    +      -       -      -
     68A  GLU*     2.9    38.0    +      -       +      +
    243A  TYR*     3.8    21.8    -      -       +      -
    270A  LYS      4.9     0.2    -      -       -      -
    273A  GLY*     6.3     0.2    -      -       -      -
    334A  VAL*     3.2    38.0    +      -       +      -
    335A  ILE*     3.3     5.1    +      -       -      +
    337A  PHE*     1.3    96.3    -      +       -      +
    339A  LYS*     1.3    52.3    +      -       -      +
    341A  ASN*     3.3     6.6    +      -       -      +
    342A  THR*     2.6    38.9    +      -       -      +
    363A  PRO*     4.4     5.2    -      -       +      -
    407A  ALA*     3.8    12.9    -      -       -      +
    408A  PHE*     3.5    49.8    -      +       +      -
    409A  GLY      4.3     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242A  MET      5.7     0.2    -      -       -      -
    243A  TYR*     2.7    40.9    +      -       +      +
    244A  MET      4.8     2.5    -      -       -      -
    245A  SER*     3.2    17.0    +      -       -      -
    335A  ILE*     3.1    38.6    +      -       +      +
    336A  GLY*     4.1     7.6    -      -       -      +
    338A  TYR*     1.3    71.7    -      -       -      +
    340A  GLU*     1.3    63.9    +      -       -      +
    342A  THR*     3.6    11.2    +      -       -      -
    343A  ASN*     3.1    30.7    +      -       -      +
    359A  GLY      5.1     3.7    +      -       -      +
    360A  LYS      3.1    21.2    +      -       -      -
    361A  ASN      4.7     0.8    -      -       -      -
    362A  ALA      4.7     2.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  GLY      3.2    12.1    +      -       -      +
    337A  PHE*     3.1    12.3    +      -       -      +
    339A  LYS*     1.3    75.1    -      -       -      +
    341A  ASN*     1.4    58.0    +      -       -      +
    343A  ASN*     2.8    45.8    +      -       -      +
    344A  ILE*     2.9    29.7    +      -       +      +
    411A  ARG*     3.5    22.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  PHE*     3.1    23.7    +      -       -      -
    338A  TYR*     3.4     6.6    -      -       -      +
    340A  GLU*     1.4    73.6    -      -       -      +
    342A  THR*     1.3    58.2    +      -       -      +
    344A  ILE*     3.5    10.4    -      -       -      +
    345A  ILE*     3.0    30.5    +      -       -      +
    407A  ALA*     3.1    28.3    +      -       +      +
    409A  GLY      2.9    28.3    +      -       -      -
    411A  ARG*     2.8    34.7    +      -       -      -
    414A  ILE*     3.7    17.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  TYR      2.6    28.9    -      -       -      +
    339A  LYS*     3.6     9.2    +      -       -      -
    340A  GLU      3.1     0.6    -      -       -      -
    341A  ASN*     1.3    79.4    -      -       -      +
    343A  ASN*     1.3    55.9    +      -       -      +
    345A  ILE*     3.2     4.9    +      -       -      +
    346A  ILE*     3.0    30.9    +      -       -      +
    359A  GLY*     3.1    30.3    +      -       -      -
    362A  ALA      4.1     2.9    -      -       -      +
    363A  PRO*     3.5    25.4    -      -       +      -
    365A  VAL*     4.0     7.6    -      -       -      +
    407A  ALA*     3.3    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339A  LYS*     3.1    18.4    +      -       -      +
    340A  GLU*     2.8    33.1    +      -       -      +
    342A  THR*     1.3    72.5    -      -       -      +
    344A  ILE*     1.3    58.8    +      -       -      +
    346A  ILE*     3.4    18.4    +      -       -      +
    347A  ASP*     3.0    41.8    +      -       -      +
    359A  GLY      4.3     5.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  GLU*     2.9    28.7    +      -       -      +
    341A  ASN*     3.5    11.9    -      -       -      +
    343A  ASN*     1.3    74.6    -      -       -      +
    345A  ILE*     1.3    60.0    +      -       -      +
    347A  ASP*     3.6     8.0    +      -       -      +
    348A  THR*     2.8    29.4    +      -       +      +
    411A  ARG*     3.7    38.4    -      -       -      +
    414A  ILE*     4.2     9.2    -      -       +      -
    415A  LEU*     4.1    25.1    -      -       +      -
    418A  CYS*     4.0    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  LEU*     4.8     3.8    -      -       +      -
    341A  ASN      3.0    22.6    +      -       -      +
    342A  THR*     3.2     5.5    +      -       -      +
    344A  ILE*     1.3    75.6    -      -       -      +
    346A  ILE*     1.3    57.0    +      -       -      +
    348A  THR*     3.3     7.0    +      -       -      +
    349A  PHE*     3.0    45.9    +      -       +      -
    365A  VAL*     3.5    30.7    -      -       +      -
    405A  VAL*     4.2    14.6    -      -       +      +
    406A  SER      3.7    10.5    -      -       -      +
    407A  ALA*     3.6    32.8    -      -       +      -
    414A  ILE*     3.8    22.2    -      -       +      -
    418A  CYS*     3.9     9.0    -      -       -      -
    421A  PHE*     5.2     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  THR*     3.0    17.3    +      -       -      +
    343A  ASN*     3.5    18.6    -      -       -      +
    345A  ILE*     1.3    78.0    -      -       -      +
    347A  ASP*     1.3    62.2    +      -       -      +
    349A  PHE*     3.7     1.2    -      -       -      +
    350A  THR*     2.7    48.1    +      -       -      +
    356A  VAL*     4.2    21.8    -      -       +      +
    358A  GLY      4.3     3.8    -      -       -      +
    359A  GLY*     3.4    37.7    -      -       -      +
    360A  LYS*     5.4     0.2    -      -       -      -
    365A  VAL*     3.8    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343A  ASN*     3.0    26.8    +      -       -      +
    344A  ILE*     3.9     7.3    +      -       -      +
    346A  ILE*     1.3    80.4    -      -       -      +
    348A  THR*     1.3    59.7    +      -       -      +
    350A  THR*     4.1     4.7    -      -       -      +
    351A  SER*     2.9    33.8    +      -       -      -
    422A  LYS*     5.3     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 348 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344A  ILE*     2.8    22.9    +      -       +      +
    345A  ILE      3.3     6.0    +      -       -      +
    347A  ASP*     1.3    72.9    -      -       -      +
    349A  PHE*     1.3    67.0    +      -       +      +
    351A  SER*     3.0    21.2    +      -       -      -
    352A  LEU*     3.1    24.3    +      -       -      +
    418A  CYS*     3.0    42.0    +      -       +      -
    421A  PHE*     4.2     7.1    -      -       -      +
    422A  LYS*     3.7    24.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 349 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345A  ILE*     3.0    39.8    +      -       +      +
    348A  THR*     1.3    77.1    +      -       -      +
    350A  THR*     1.3    67.0    +      -       -      +
    352A  LEU*     3.5     7.2    +      -       +      +
    353A  GLY      3.4     3.6    +      -       -      -
    354A  TYR*     3.1    36.5    +      +       +      +
    356A  VAL*     3.5    22.4    -      -       +      -
    365A  VAL*     4.9     0.2    -      -       +      -
    367A  VAL*     3.7    22.7    -      -       +      -
    369A  PHE*     4.0    23.8    -      +       -      -
    381A  ILE*     5.8     2.7    -      -       +      -
    389A  THR*     6.3     0.2    -      -       +      -
    403A  VAL*     6.2     0.2    -      -       +      -
    405A  VAL*     4.3    15.7    -      -       +      -
    421A  PHE*     3.4    50.9    -      +       +      -
    425A  TYR*     4.5    13.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with THR 350 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346A  ILE*     2.7    31.0    +      -       -      +
    347A  ASP*     4.1     5.2    -      -       -      -
    349A  PHE*     1.3    74.3    -      -       -      +
    351A  SER*     1.3    53.7    +      -       -      +
    353A  GLY*     2.7    28.4    +      -       -      -
    354A  TYR      4.1     9.4    +      -       -      +
    356A  VAL*     4.0    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 351 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    347A  ASP      2.9    19.4    +      -       -      -
    348A  THR*     3.0    16.8    +      -       -      -
    350A  THR*     1.3    73.1    -      -       -      +
    352A  LEU*     1.3    59.4    +      -       -      +
    353A  GLY      3.2     3.2    +      -       -      -
    422A  LYS*     4.1    14.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 352 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348A  THR*     3.1    32.7    +      -       -      +
    349A  PHE*     3.9    12.8    -      -       +      +
    350A  THR      3.2     0.4    -      -       -      -
    351A  SER*     1.3    80.2    +      -       -      +
    353A  GLY*     1.3    57.9    +      -       -      +
    354A  TYR*     3.5    20.3    +      -       +      -
    421A  PHE*     3.8    26.2    -      -       +      +
    422A  LYS*     4.3    16.4    -      -       +      +
    425A  TYR*     3.4    42.0    -      -       +      +
    426A  LYS      4.4     7.1    +      -       -      +
----------------------------------------------------------
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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