Contacts of the helix formed by residues 332 - 356 (chain A) in PDB entry 3U1K


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 ASP 332 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  GLN*     5.5     1.7    +      -       -      -
    275A  LYS*     5.6     4.0    +      -       -      -
    277A  PHE*     6.0     3.1    -      -       -      -
    331A  ALA*     1.3    80.3    +      -       +      +
    333A  PRO*     1.3    95.3    -      -       -      +
    334A  TYR*     3.3    27.0    +      -       -      +
    335A  GLU*     2.7    35.5    +      -       +      +
    336A  ILE*     2.9    13.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  LYS*     5.4    14.4    -      -       -      -
    331A  ALA*     4.5     7.4    -      -       +      -
    332A  ASP*     1.3    91.1    -      -       -      +
    334A  TYR*     1.3    64.6    +      -       +      +
    336A  ILE*     3.2    15.5    +      -       +      +
    337A  ILE*     2.8    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92A  PRO      5.3     4.3    +      -       -      -
     94A  GLN*     3.1    58.1    -      -       +      +
    332A  ASP*     2.9    19.8    +      -       -      +
    333A  PRO*     1.3    84.1    -      -       +      +
    335A  GLU*     1.3    58.2    +      -       -      +
    337A  ILE*     3.3    18.0    +      -       +      +
    338A  GLU*     2.8    35.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275A  LYS*     5.8     2.1    +      -       -      -
    278A  THR      4.4     2.2    -      -       -      +
    279A  PRO*     3.7    17.7    -      -       +      +
    280A  SER*     3.1    29.1    +      -       -      -
    283A  ILE*     3.6    24.8    -      -       +      +
    331A  ALA      4.5     1.9    -      -       -      +
    332A  ASP*     2.7    34.2    +      -       +      +
    334A  TYR*     1.3    72.7    -      -       -      +
    336A  ILE*     1.3    58.0    +      -       -      +
    338A  GLU*     3.5    14.0    -      -       -      +
    339A  SER*     2.9    28.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283A  ILE*     4.9    11.0    -      -       +      -
    321A  GLU*     3.9    25.5    -      -       +      +
    324A  LEU*     3.6    30.6    -      -       +      +
    325A  LYS*     3.8    39.3    -      -       +      +
    328A  PHE*     4.5    10.3    -      -       +      +
    331A  ALA*     4.8     3.6    -      -       -      +
    332A  ASP      2.9    27.4    +      -       -      +
    333A  PRO*     3.4    11.4    -      -       +      +
    335A  GLU*     1.3    77.0    -      -       +      +
    337A  ILE*     1.3    64.0    +      -       +      +
    339A  SER*     3.3     7.2    +      -       -      -
    340A  PHE*     3.3    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  ARG*     5.9     2.9    -      -       -      +
    321A  GLU*     3.2    29.3    -      -       -      +
    333A  PRO*     2.8    25.1    +      -       +      +
    334A  TYR*     3.4    22.9    -      -       +      +
    336A  ILE*     1.3    74.7    -      -       +      +
    338A  GLU*     1.3    66.6    +      -       +      +
    339A  SER      3.2     0.3    +      -       -      -
    340A  PHE*     3.3     4.5    +      -       -      +
    341A  ASN*     3.2    35.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  GLN*     4.2    12.4    +      -       +      +
    147A  PHE*     3.8    14.5    -      -       +      -
    277A  PHE*     3.2    40.8    -      -       -      +
    278A  THR      3.8     0.7    -      -       -      -
    279A  PRO*     3.3    27.8    -      -       +      +
    334A  TYR*     2.8    30.4    +      -       +      +
    335A  GLU*     3.4    17.1    +      -       -      +
    337A  ILE*     1.3    73.7    -      -       +      +
    339A  SER*     1.3    58.0    +      -       -      +
    341A  ASN*     3.3     9.0    +      -       -      +
    342A  VAL*     2.9    33.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  PRO*     4.1    13.7    -      -       -      -
    283A  ILE*     3.2    20.1    +      -       -      -
    284A  VAL*     3.2    34.3    +      -       -      +
    287A  THR*     3.3     9.8    +      -       -      -
    324A  LEU*     5.8     0.2    -      -       -      -
    335A  GLU      2.9    17.9    +      -       -      -
    336A  ILE      3.6     6.1    -      -       -      -
    337A  ILE      3.1     0.2    -      -       -      -
    338A  GLU*     1.3    76.8    -      -       -      +
    340A  PHE*     1.3    62.6    +      -       -      +
    342A  VAL*     3.3     2.6    +      -       -      +
    343A  VAL*     3.0    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287A  THR*     4.0    13.8    -      -       +      +
    291A  ALA*     4.2     7.2    -      -       +      -
    295A  LEU*     3.9    20.6    -      -       +      -
    313A  VAL*     3.6    14.8    -      -       +      -
    316A  ILE*     3.9     7.9    -      -       +      -
    317A  ARG*     3.5    67.3    -      -       +      -
    320A  THR*     3.7    32.5    -      -       +      -
    321A  GLU*     4.5    11.7    -      -       +      +
    324A  LEU*     5.9     0.7    -      -       +      -
    336A  ILE      3.3    10.3    +      -       -      +
    337A  ILE      3.3     6.7    +      -       -      +
    339A  SER*     1.3    77.7    -      -       -      +
    341A  ASN*     1.3    58.1    +      -       -      +
    343A  VAL*     3.2     1.8    +      -       +      +
    344A  ALA*     2.8    38.8    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    317A  ARG*     4.1    21.5    +      -       -      -
    337A  ILE*     3.2    29.4    +      -       -      +
    338A  GLU*     3.6     9.6    -      -       -      +
    339A  SER      3.3     0.2    -      -       -      -
    340A  PHE*     1.3    79.8    -      -       -      +
    342A  VAL*     1.3    59.6    +      -       -      +
    344A  ALA*     3.9     5.7    -      -       -      +
    345A  LYS*     2.9    31.4    +      -       -      +
    540A  ASN*     5.0     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  PRO*     4.0    19.3    -      -       +      -
    284A  VAL*     4.2    23.1    -      -       +      -
    338A  GLU*     2.9    19.5    +      -       +      +
    339A  SER*     3.6     9.2    -      -       -      +
    341A  ASN*     1.3    75.4    -      -       +      +
    343A  VAL*     1.3    57.6    +      -       -      +
    345A  LYS*     3.4     8.2    +      -       -      +
    346A  GLU*     3.0    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284A  VAL*     3.6    37.0    -      -       +      +
    287A  THR*     3.8    18.6    -      -       +      +
    288A  HIS*     3.7    29.8    -      -       +      +
    291A  ALA*     5.0     0.9    -      -       +      -
    292A  MET      5.1     0.7    -      -       -      +
    295A  LEU*     4.1    16.2    -      -       +      -
    339A  SER      3.0    17.4    +      -       -      +
    340A  PHE*     3.2     3.6    +      -       +      +
    342A  VAL*     1.3    74.4    -      -       +      +
    344A  ALA*     1.3    65.0    +      -       -      +
    346A  GLU*     3.2     5.1    +      -       -      +
    347A  VAL*     2.9    34.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295A  LEU*     3.8    22.1    -      -       +      +
    299A  PHE*     3.6    12.5    -      -       +      -
    313A  VAL*     5.2     4.5    -      -       +      -
    317A  ARG*     5.9     0.9    -      -       -      +
    340A  PHE*     2.8    39.3    +      -       +      +
    341A  ASN*     3.9     6.7    -      -       -      +
    343A  VAL*     1.3    72.2    -      -       -      +
    345A  LYS*     1.3    62.7    +      -       -      +
    347A  VAL*     4.8     0.2    -      -       -      -
    348A  PHE*     3.0    26.4    +      -       -      +
    540A  ASN*     4.9     4.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  ASN      2.9    19.5    +      -       -      +
    342A  VAL*     3.5     8.3    -      -       -      +
    344A  ALA*     1.3    78.5    -      -       -      +
    346A  GLU*     1.3    58.6    +      -       -      +
    348A  PHE*     3.4     1.2    +      -       -      +
    349A  ARG*     2.9    60.6    +      -       -      +
    539A  TYR      4.6     8.7    +      -       -      +
    540A  ASN*     3.6    45.3    +      -       -      +
    541A  GLY      4.7     5.9    +      -       -      -
    542A  ASP*     5.0     2.4    +      -       -      -
    562A  LYS*     5.9     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288A  HIS*     5.2    14.6    -      -       +      +
    342A  VAL*     3.0    19.6    +      -       +      +
    343A  VAL*     3.2     6.3    +      -       -      +
    345A  LYS*     1.3    73.5    -      -       -      +
    347A  VAL*     1.3    61.8    +      -       -      +
    349A  ARG*     3.3    13.5    +      -       -      +
    350A  SER*     2.9    43.2    +      -       -      -
    353A  LEU*     5.8     2.4    -      -       -      +
    516A  LYS*     6.0     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288A  HIS*     4.6     7.6    -      -       +      +
    292A  MET*     3.9    33.4    -      -       +      +
    295A  LEU*     4.0    12.3    -      -       +      -
    296A  TYR*     3.7    37.5    -      -       +      +
    299A  PHE*     4.3     3.4    -      -       +      -
    343A  VAL*     2.9    33.8    +      -       +      +
    344A  ALA      4.0     2.7    -      -       -      +
    346A  GLU*     1.3    74.7    -      -       -      +
    348A  PHE*     1.3    66.2    +      -       -      +
    350A  SER*     2.7    24.5    +      -       -      +
    351A  ILE*     3.3    12.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 348 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299A  PHE*     3.7    35.8    -      +       +      -
    344A  ALA      3.0    19.6    +      -       -      +
    345A  LYS      3.4     3.6    -      -       -      +
    347A  VAL*     1.3    79.0    -      -       -      +
    349A  ARG*     1.3    69.0    +      -       +      +
    351A  ILE*     3.5    12.7    +      -       -      +
    352A  VAL*     3.7    23.4    +      -       +      +
    359A  CYS*     3.7    29.8    -      -       +      -
    514A  VAL*     5.4     5.8    -      -       +      -
    536A  ILE*     3.9    19.7    -      -       +      -
    537A  GLU*     3.6    37.0    -      -       +      -
    540A  ASN*     3.7    33.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 349 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345A  LYS*     2.9    47.6    +      -       -      +
    346A  GLU*     3.9    13.4    +      -       -      +
    348A  PHE*     1.3    81.8    -      -       +      +
    350A  SER*     1.3    66.9    +      -       -      +
    352A  VAL*     3.1     7.8    +      -       -      +
    353A  LEU*     3.0    29.5    +      -       +      +
    514A  VAL*     3.7    23.5    -      -       +      +
    515A  THR*     2.7    32.1    +      -       -      +
    540A  ASN      2.9    33.3    +      -       -      +
    541A  GLY*     4.0     2.8    -      -       -      -
    542A  ASP*     2.9    40.5    +      -       -      -
    563A  LEU*     5.5     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 350 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292A  MET*     5.8     3.3    -      -       -      +
    296A  TYR*     5.8     0.7    -      -       -      -
    346A  GLU*     2.9    32.7    +      -       -      -
    347A  VAL*     2.7    25.5    +      -       -      +
    349A  ARG*     1.3    71.8    -      -       -      +
    351A  ILE*     1.3    54.7    +      -       -      +
    353A  LEU*     4.4     8.7    -      -       -      -
    354A  ASN*     2.7    54.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 351 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296A  TYR*     3.7    40.2    -      -       +      -
    299A  PHE*     3.6    34.3    -      -       +      +
    300A  THR*     4.1    16.4    -      -       +      -
    347A  VAL*     3.3    16.1    +      -       +      +
    348A  PHE      3.7     7.0    -      -       -      +
    349A  ARG      3.1     0.6    -      -       -      -
    350A  SER*     1.3    77.0    +      -       -      +
    352A  VAL*     1.3    61.1    +      -       +      +
    354A  ASN*     4.9     0.4    -      -       -      -
    355A  GLU*     2.9    51.8    +      -       +      +
    356A  TYR      3.6     1.0    +      -       -      -
    357A  LYS*     3.8    16.2    -      -       +      +
    358A  ARG      5.7     2.2    -      -       -      -
    359A  CYS      5.9     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 352 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    348A  PHE*     3.7    26.2    +      -       +      +
    349A  ARG*     3.1     7.5    +      -       -      +
    351A  ILE*     1.3    77.2    -      -       +      +
    353A  LEU*     1.3    59.7    +      -       -      +
    356A  TYR*     3.0    25.5    +      -       -      -
    357A  LYS      3.5    16.4    -      -       -      +
    358A  ARG*     4.6    13.0    -      -       +      -
    359A  CYS      5.6     0.9    -      -       -      +
    364A  LEU*     4.3     6.3    -      -       +      -
    514A  VAL*     4.3    20.4    -      -       +      -
    528A  ARG*     3.5    31.6    +      -       +      -
    530A  LEU*     4.1    18.4    -      -       +      -
    537A  GLU*     5.4     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 353 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346A  GLU*     5.8     2.2    -      -       -      +
    349A  ARG*     3.0    23.3    +      -       +      +
    350A  SER*     3.7     7.9    -      -       -      +
    352A  VAL*     1.3    77.9    -      -       -      +
    354A  ASN*     1.3    67.7    +      -       -      +
    356A  TYR*     3.5     5.2    -      -       -      -
    514A  VAL*     3.9    23.1    -      -       +      +
    515A  THR      4.0    11.0    -      -       -      +
    516A  LYS*     3.8    33.9    -      -       +      +
    526A  ASP*     4.5     3.8    -      -       -      +
    527A  TYR*     4.3    10.3    -      -       -      +
    528A  ARG*     2.8    57.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 354 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350A  SER*     2.7    36.1    +      -       -      +
    351A  ILE*     4.9     0.9    -      -       -      -
    353A  LEU*     1.3    81.9    -      -       -      +
    355A  GLU*     1.3    69.3    +      -       +      +
    356A  TYR*     3.7     9.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 355 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296A  TYR*     2.6    39.9    +      -       -      -
    300A  THR*     4.7     4.9    -      -       -      +
    302A  TYR*     5.5     2.3    +      -       -      -
    351A  ILE*     2.9    28.8    +      -       +      +
    354A  ASN*     1.3    87.3    -      -       +      +
    356A  TYR*     1.3    75.5    +      -       -      +
    357A  LYS*     3.0    19.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 356 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    352A  VAL      3.0    15.8    +      -       -      -
    353A  LEU      3.5    16.4    -      -       -      -
    354A  ASN      4.0     9.2    -      -       -      -
    355A  GLU*     1.3    81.8    -      -       -      +
    357A  LYS*     1.3    68.2    -      -       -      +
    362A  ARG      4.4     0.2    -      -       -      +
    363A  ASP*     4.5     1.2    -      -       -      +
    364A  LEU*     4.0    37.6    +      -       +      +
    526A  ASP*     4.7     0.5    +      -       -      -
    528A  ARG*     2.9    46.3    +      -       -      -
----------------------------------------------------------
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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