Contacts of the helix formed by residues 324 - 351 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320B  LEU*     3.5    16.2    -      -       +      +
    321B  ALA*     2.8    22.1    +      -       -      +
    322B  CYS      2.9     2.6    +      -       -      -
    323B  LEU*     1.3    82.5    -      -       -      +
    325B  PRO*     1.4    65.2    -      -       -      +
    326B  GLU*     3.1    19.3    +      -       -      +
    327B  GLY      3.0    11.4    +      -       -      -
    328B  LEU*     2.6    40.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 325 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324B  THR*     1.4    82.7    -      -       -      +
    326B  GLU*     1.3    67.0    -      -       +      +
    328B  LEU*     3.7     6.9    -      -       +      +
    329B  GLU*     2.7    35.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 326 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  VAL*     3.9    29.6    -      -       +      +
    321B  ALA      4.8     0.3    -      -       -      +
    324B  THR*     3.1    20.8    +      -       -      +
    325B  PRO*     1.3   101.3    -      -       +      +
    327B  GLY*     1.3    56.2    +      -       -      +
    329B  GLU*     3.5    13.7    -      -       -      +
    330B  ALA*     2.9    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 327 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  VAL*     4.5     4.6    -      -       -      +
     74B  ILE*     4.4     8.0    -      -       -      +
    321B  ALA      3.3    15.2    +      -       -      -
    322B  CYS*     3.1    22.9    -      -       -      -
    324B  THR*     3.0     9.5    +      -       -      -
    326B  GLU*     1.3    72.6    -      -       -      +
    328B  LEU*     1.3    64.1    +      -       -      +
    330B  ALA*     3.0    14.2    +      -       -      +
    331B  MET*     3.1    16.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 328 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  THR*     4.4    17.7    -      -       +      -
    111B  PHE*     5.2     3.6    -      -       +      -
    242B  MET*     6.3     0.9    -      -       -      -
    322B  CYS      3.1     7.0    +      -       -      +
    323B  LEU*     4.1    15.0    -      -       +      -
    324B  THR*     2.6    42.2    +      -       -      +
    325B  PRO*     3.8     5.6    -      -       +      +
    327B  GLY*     1.3    70.6    -      -       -      -
    329B  GLU*     1.3    62.2    +      -       -      +
    331B  MET*     3.3    29.7    +      -       +      +
    332B  HIS*     3.1    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 329 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325B  PRO      2.7    20.5    +      -       -      +
    326B  GLU*     3.5    12.0    -      -       -      +
    328B  LEU*     1.3    78.8    -      -       -      +
    330B  ALA*     1.3    61.4    +      -       -      +
    332B  HIS*     3.5     6.7    +      -       -      +
    333B  LYS*     3.2    42.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 330 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  PRO*     3.3    35.2    -      -       +      -
     73B  VAL*     3.9    10.5    -      -       +      -
     74B  ILE*     5.2     1.8    -      -       +      -
    326B  GLU      2.9    20.0    +      -       -      +
    327B  GLY*     3.0     5.4    +      -       -      +
    329B  GLU*     1.3    74.1    -      -       -      +
    331B  MET*     1.3    55.9    +      -       +      +
    333B  LYS*     3.3    17.8    +      -       -      +
    334B  VAL*     3.0    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 331 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71B  PRO*     5.8     1.3    -      -       +      -
     74B  ILE*     5.5     1.3    -      -       +      -
    111B  PHE*     4.8     5.2    -      -       +      -
    242B  MET*     5.3     5.8    -      -       +      -
    268B  PHE*     4.5     5.2    -      -       -      -
    271B  TYR*     3.8    55.4    -      -       +      +
    272B  ALA*     4.5     7.0    -      -       +      +
    322B  CYS*     3.7    30.7    -      -       +      +
    323B  LEU*     4.6     6.7    -      -       +      -
    327B  GLY      3.1    11.6    +      -       -      +
    328B  LEU*     3.3    36.3    -      -       +      +
    329B  GLU      3.4     0.2    -      -       -      -
    330B  ALA*     1.3    74.1    -      -       +      +
    332B  HIS*     1.3    55.8    +      -       -      +
    334B  VAL*     3.3     3.1    +      -       -      +
    335B  ILE*     2.7    44.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 332 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328B  LEU      3.1    17.8    +      -       -      +
    329B  GLU*     3.6     7.2    +      -       -      +
    331B  MET*     1.3    77.4    -      -       -      +
    333B  LYS*     1.3    54.3    +      -       -      +
    335B  ILE*     3.8     9.6    -      -       +      +
    336B  GLY*     2.8    31.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 333 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329B  GLU*     3.2    36.9    +      -       +      +
    330B  ALA*     3.3    22.3    -      -       -      +
    332B  HIS*     1.3    80.3    +      -       -      +
    334B  VAL*     1.3    61.8    +      -       +      +
    336B  GLY*     3.4     2.8    +      -       -      -
    337B  PHE*     3.0    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 334 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  GLU*     5.6     9.2    -      -       +      -
     69B  PRO      5.0     5.4    -      -       -      +
     71B  PRO*     3.9    22.2    -      -       +      -
    270B  LYS      5.3     0.2    -      -       -      +
    271B  TYR      2.8    31.6    -      -       -      +
    272B  ALA*     4.9     4.9    -      -       -      -
    273B  GLY      5.5     0.4    -      -       -      +
    330B  ALA      3.0    16.0    +      -       -      +
    331B  MET*     3.4     4.3    -      -       -      +
    333B  LYS*     1.3    77.6    -      -       +      +
    335B  ILE*     1.3    60.9    +      -       +      +
    337B  PHE*     2.8    25.4    +      -       +      +
    338B  TYR*     3.2    34.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 335 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  MET*     3.5    47.6    -      -       +      +
    243B  TYR*     3.8    33.5    -      -       +      +
    270B  LYS      4.4     3.6    -      -       -      +
    271B  TYR*     3.9    23.6    -      -       +      +
    331B  MET*     2.7    30.8    +      -       +      +
    332B  HIS*     4.0     7.9    -      -       +      +
    334B  VAL*     1.3    70.8    -      -       +      +
    336B  GLY*     1.3    53.0    +      -       -      +
    338B  TYR*     3.3     4.3    +      -       -      +
    339B  LYS*     2.8    57.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 336 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332B  HIS*     2.8    19.5    +      -       -      -
    333B  LYS*     3.6     3.4    -      -       -      -
    334B  VAL      3.1     0.2    -      -       -      -
    335B  ILE*     1.3    75.9    -      -       -      +
    337B  PHE*     1.3    64.5    +      -       -      +
    339B  LYS*     4.2     8.5    -      -       -      +
    340B  GLU*     3.0    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 337 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  GLU*     3.6    33.2    -      -       +      -
    333B  LYS      3.0    12.1    +      -       -      +
    334B  VAL*     2.8    17.1    +      -       +      +
    336B  GLY*     1.3    76.5    -      -       -      +
    338B  TYR*     1.3    72.7    +      +       -      +
    340B  GLU*     3.1     0.6    +      -       -      -
    341B  ASN*     2.8    46.4    +      -       -      +
    409B  GLY      3.5     9.2    -      -       -      -
    411B  ARG*     3.3    67.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 338 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  THR*     3.8    12.0    -      -       +      -
     67B  THR*     3.0    30.8    +      -       -      -
     68B  GLU*     3.1    21.1    +      -       +      +
    243B  TYR*     3.7    27.8    -      -       +      -
    270B  LYS      5.0     0.9    -      -       -      -
    334B  VAL*     3.2    35.4    +      -       +      -
    335B  ILE*     3.7     4.3    -      -       -      +
    337B  PHE*     1.3    99.1    -      +       -      +
    339B  LYS*     1.3    49.8    +      -       -      +
    341B  ASN*     3.5     7.8    -      -       -      +
    342B  THR*     2.6    38.5    +      -       -      +
    363B  PRO*     4.9     2.9    -      -       +      -
    407B  ALA*     3.8    13.8    -      -       -      +
    408B  PHE*     3.6    40.4    -      +       +      -
    409B  GLY      4.4     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 339 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  MET      5.2     0.2    -      -       -      +
    243B  TYR*     2.6    44.7    +      -       +      +
    244B  MET      4.7     2.5    -      -       -      -
    245B  SER*     3.2    19.5    -      -       -      -
    335B  ILE*     2.8    38.8    +      -       +      +
    336B  GLY*     4.2     7.0    -      -       -      +
    338B  TYR*     1.3    73.9    -      -       -      +
    340B  GLU*     1.3    65.0    +      -       -      +
    342B  THR*     3.2    10.7    +      -       +      +
    343B  ASN*     3.1    30.3    +      -       -      +
    359B  GLY      5.5     1.0    +      -       -      -
    360B  LYS      2.8    24.5    +      -       -      -
    361B  ASN*     4.2     0.8    -      -       -      +
    362B  ALA      4.4     3.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 340 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  GLY      3.0    14.6    +      -       -      +
    337B  PHE*     3.5     2.2    -      -       -      +
    339B  LYS*     1.3    72.2    -      -       -      +
    341B  ASN*     1.3    67.2    +      -       -      +
    342B  THR      2.9     1.0    +      -       -      -
    343B  ASN*     3.0    34.7    +      -       -      +
    344B  ILE*     3.3    32.6    +      -       +      +
    411B  ARG*     3.4    28.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 341 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337B  PHE*     2.8    32.4    +      -       -      -
    338B  TYR*     3.5     7.3    -      -       -      +
    340B  GLU*     1.3    72.2    -      -       -      +
    342B  THR*     1.3    60.7    +      -       -      +
    344B  ILE*     3.5    10.0    +      -       -      +
    345B  ILE*     3.3    24.8    +      -       -      +
    407B  ALA*     3.0    30.6    +      -       +      +
    409B  GLY      3.2    23.8    +      -       -      -
    411B  ARG*     2.6    37.8    +      -       -      +
    414B  ILE*     3.6    18.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 342 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338B  TYR      2.6    32.7    +      -       -      +
    339B  LYS*     3.6    15.4    +      -       +      +
    340B  GLU      2.9     2.0    +      -       -      -
    341B  ASN*     1.3    72.8    -      -       -      +
    343B  ASN*     1.4    60.5    +      -       -      +
    345B  ILE*     3.2     5.4    +      -       -      +
    346B  ILE*     3.0    29.6    +      -       -      +
    359B  GLY*     3.2    32.1    +      -       -      -
    362B  ALA      4.0     4.9    -      -       -      +
    363B  PRO*     3.8    19.1    -      -       +      -
    365B  VAL*     4.2     5.9    -      -       -      +
    407B  ALA*     3.4    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 343 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339B  LYS*     3.1    19.9    +      -       -      +
    340B  GLU*     3.0    32.0    +      -       -      +
    342B  THR*     1.4    75.3    +      -       -      +
    344B  ILE*     1.3    52.9    +      -       +      +
    346B  ILE*     3.5    10.1    +      -       -      +
    347B  ASP*     2.7    47.5    +      -       -      +
    359B  GLY      4.5     9.4    -      -       -      +
    360B  LYS*     6.0     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 344 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340B  GLU*     3.3    31.4    +      -       -      +
    341B  ASN*     3.6     9.2    -      -       -      +
    342B  THR      3.2     0.4    -      -       -      -
    343B  ASN*     1.3    75.4    -      -       -      +
    345B  ILE*     1.3    54.3    +      -       -      +
    347B  ASP*     3.4     8.8    +      -       +      +
    348B  THR*     2.6    40.7    +      -       +      +
    411B  ARG*     3.8    35.0    -      -       -      +
    414B  ILE*     4.1     9.4    -      -       +      -
    415B  LEU*     4.2    23.3    -      -       +      -
    418B  CYS*     4.0    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 345 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  LEU*     4.4     7.4    -      -       +      -
    341B  ASN      3.3    16.7    +      -       -      +
    342B  THR      3.2     7.1    +      -       -      +
    344B  ILE*     1.3    77.8    -      -       -      +
    346B  ILE*     1.3    60.0    +      -       -      +
    348B  THR*     3.4     1.6    +      -       -      -
    349B  PHE*     3.1    41.3    +      -       +      -
    365B  VAL*     3.5    24.9    -      -       +      -
    405B  VAL*     4.0    18.8    -      -       +      -
    406B  SER      3.7    24.7    -      -       -      +
    407B  ALA*     3.8    17.0    -      -       +      -
    414B  ILE*     4.1    12.8    -      -       +      -
    418B  CYS*     4.0    19.5    -      -       -      -
    421B  PHE*     5.4     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 346 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342B  THR      3.0    15.7    +      -       -      +
    343B  ASN*     3.6    12.8    -      -       -      +
    345B  ILE*     1.3    72.7    -      -       -      +
    347B  ASP*     1.3    74.4    +      -       -      +
    348B  THR      3.1     0.2    +      -       -      -
    349B  PHE*     3.2     1.9    +      -       -      +
    350B  THR*     3.0    30.7    +      -       +      +
    356B  VAL*     4.1    24.0    -      -       +      -
    358B  GLY      3.9     6.1    -      -       -      +
    359B  GLY*     3.1    37.0    -      -       -      +
    360B  LYS*     5.3     0.9    -      -       +      -
    365B  VAL*     4.0    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 347 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343B  ASN*     2.7    34.7    +      -       -      +
    344B  ILE*     3.4    10.7    +      -       -      +
    346B  ILE*     1.3    77.0    -      -       -      +
    348B  THR*     1.3    59.9    -      -       +      +
    350B  THR*     3.6     5.3    -      -       -      +
    351B  SER*     2.8    34.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 348 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344B  ILE*     2.6    32.0    +      -       +      +
    345B  ILE      3.9     2.6    +      -       -      +
    346B  ILE      3.2     0.2    -      -       -      -
    347B  ASP*     1.3    75.2    -      -       +      +
    349B  PHE*     1.3    68.5    +      -       -      +
    351B  SER*     2.9    19.5    +      -       -      -
    352B  LEU*     3.3    15.5    -      -       -      +
    418B  CYS*     3.4    40.2    +      -       +      +
    421B  PHE*     4.4    13.7    -      -       -      +
    422B  LYS*     3.8    26.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 349 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345B  ILE*     3.1    34.9    +      -       +      +
    346B  ILE*     3.2     1.1    +      -       -      +
    348B  THR*     1.3    79.4    +      -       -      +
    350B  THR*     1.3    58.1    +      -       -      +
    352B  LEU*     3.3    17.8    +      -       +      +
    354B  TYR*     3.2    36.4    +      +       -      -
    356B  VAL*     3.4    22.4    -      -       +      -
    365B  VAL*     4.9     0.2    -      -       +      -
    367B  VAL*     3.7    22.7    -      -       +      -
    369B  PHE*     4.1    23.6    -      +       -      -
    381B  ILE*     5.8     2.7    -      -       +      -
    389B  THR*     6.3     0.4    -      -       +      -
    403B  VAL*     6.3     0.2    -      -       +      -
    405B  VAL*     4.1    22.7    -      -       +      -
    421B  PHE*     3.7    43.1    -      +       -      -
    425B  TYR*     4.6    15.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with THR 350 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346B  ILE*     3.0    24.9    +      -       +      +
    347B  ASP*     3.6     4.3    -      -       -      +
    349B  PHE*     1.3    73.1    -      -       -      +
    351B  SER*     1.3    58.0    +      -       -      +
    352B  LEU      2.9    10.1    +      -       -      -
    353B  GLY*     2.9    14.9    +      -       -      -
    354B  TYR      4.3     6.3    +      -       -      +
    356B  VAL*     3.6    24.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 351 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    347B  ASP      2.8    15.5    +      -       -      -
    348B  THR*     2.9    20.6    +      -       -      -
    350B  THR*     1.3    75.0    -      -       -      +
    352B  LEU*     1.3    60.0    +      -       -      +
    353B  GLY      3.5     0.4    -      -       -      -
    422B  LYS*     4.5    10.3    -      -       -      -
----------------------------------------------------------
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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