Contacts of the helix formed by residues 331 - 356 (chain A) in PDB entry 3T79


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 PRO 331 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225A  LEU*     5.5     7.4    -      -       +      +
    226A  SER*     5.4    12.1    -      -       -      -
    330A  LEU*     1.3   101.5    -      -       +      +
    332A  PRO*     1.3    75.4    -      -       +      +
    333A  ASP*     3.2    13.7    +      -       -      +
    334A  ILE*     3.4    22.1    +      -       +      +
    335A  GLN*     3.2    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  LEU      3.3     5.3    -      -       -      +
    331A  PRO*     1.3    83.3    -      -       +      +
    333A  ASP*     1.3    72.2    -      -       -      +
    335A  GLN*     3.5    16.0    +      -       +      +
    336A  ALA*     4.1     5.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162A  LYS*     5.7     8.1    -      -       +      +
    164A  LEU      5.3     4.0    -      -       -      +
    331A  PRO*     3.6     6.7    -      -       -      +
    332A  PRO*     1.3    91.4    -      -       -      +
    334A  ILE*     1.3    76.9    +      -       +      +
    336A  ALA*     4.4     6.6    +      -       -      +
    337A  VAL*     4.6     6.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  LEU*     3.9    23.3    -      -       +      +
    162A  LYS*     4.3    22.4    -      -       +      -
    225A  LEU*     4.3    21.1    -      -       +      +
    231A  ILE*     5.0     4.9    -      -       +      -
    330A  LEU*     5.4     2.0    -      -       +      -
    331A  PRO*     3.8    30.1    -      -       +      +
    333A  ASP*     1.3    95.3    -      -       +      +
    335A  GLN*     1.3    65.8    +      -       -      +
    336A  ALA      3.4     0.2    -      -       -      -
    337A  VAL*     3.1    12.7    -      -       +      +
    338A  PHE*     2.8    53.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327A  PRO      3.2    20.0    +      -       -      -
    328A  THR*     3.1    29.2    -      -       +      +
    330A  LEU*     3.1    37.8    +      -       -      +
    331A  PRO      3.2    15.5    +      -       -      +
    332A  PRO*     3.8    11.2    -      -       +      +
    333A  ASP      3.4     0.8    -      -       -      -
    334A  ILE*     1.3    76.2    -      -       -      +
    336A  ALA*     1.3    58.2    +      -       -      +
    338A  PHE*     2.8    31.5    +      -       -      +
    339A  ASP*     2.8    20.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  CYS*     3.6    31.5    -      -       +      -
    168A  LEU*     4.4     8.5    -      -       +      +
    332A  PRO      4.1     5.9    +      -       -      +
    333A  ASP      4.8     5.6    -      -       -      +
    334A  ILE      3.4     0.6    -      -       -      -
    335A  GLN*     1.3    77.6    -      -       -      +
    337A  VAL*     1.3    62.8    +      -       -      +
    339A  ASP*     3.4     8.0    +      -       -      +
    340A  LEU      3.0    17.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  LEU*     4.9     9.2    -      -       +      +
    164A  LEU*     4.3    30.5    -      -       +      +
    166A  CYS*     3.8    16.9    -      -       +      +
    177A  LEU*     4.0    13.5    -      -       +      -
    202A  MET*     6.0     1.1    -      -       -      -
    206A  TYR*     6.0     1.8    -      -       +      -
    333A  ASP      4.6     4.7    -      -       -      +
    334A  ILE*     3.1    22.0    -      -       +      +
    336A  ALA*     1.3    76.2    -      -       -      +
    338A  PHE*     1.3    70.7    +      -       +      +
    340A  LEU*     2.7    24.0    +      -       -      +
    341A  LEU*     2.9    37.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  LEU*     5.0    11.2    -      -       +      -
    206A  TYR*     4.8     9.6    -      +       -      -
    210A  PHE*     4.7    18.8    -      +       -      -
    222A  TYR*     4.7    13.2    -      +       -      -
    225A  LEU*     3.2    28.5    -      -       +      -
    326A  PHE*     3.9    35.3    -      +       +      +
    327A  PRO      5.8     0.2    -      -       -      -
    330A  LEU*     4.2    13.0    -      -       +      -
    334A  ILE*     2.8    54.1    -      -       +      -
    335A  GLN*     2.8    22.2    +      -       -      +
    337A  VAL*     1.3    84.0    -      -       +      +
    339A  ASP*     1.3    56.5    +      -       -      +
    341A  LEU*     3.9    11.9    -      -       +      +
    342A  ASN*     2.9    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168A  LEU*     4.4    14.2    -      -       -      +
    318A  CYS*     5.2     5.2    -      -       -      -
    321A  VAL*     5.8     1.4    -      -       -      +
    324A  HIS*     5.1     8.5    +      -       -      -
    335A  GLN*     2.8    19.7    +      -       +      +
    336A  ALA*     3.6    11.4    -      -       -      +
    338A  PHE*     1.3    73.2    -      -       -      +
    340A  LEU*     1.3    61.7    +      -       -      +
    342A  ASN*     3.3    15.1    +      -       -      +
    343A  SER*     2.9    28.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  CYS*     4.4     9.0    -      -       -      -
    168A  LEU*     4.3     4.5    -      -       +      +
    175A  CYS*     4.1    26.0    -      -       +      -
    176A  GLY*     3.4    35.4    -      -       -      +
    177A  LEU*     3.7    24.5    -      -       +      -
    189A  PRO*     5.3     1.1    -      -       +      -
    191A  PHE*     6.0     0.9    -      -       +      -
    199A  ILE*     5.3     5.6    -      -       +      -
    318A  CYS*     4.2    18.2    -      -       -      -
    336A  ALA      3.0    13.6    +      -       -      +
    337A  VAL*     2.7    10.1    +      -       -      +
    339A  ASP*     1.3    76.2    +      -       -      +
    341A  LEU*     1.3    55.8    +      -       +      +
    343A  SER*     2.7    26.1    +      -       -      -
    344A  VAL*     2.9    32.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177A  LEU*     4.3     9.6    -      -       +      -
    199A  ILE*     5.5     2.5    -      -       +      -
    202A  MET*     4.0    32.1    -      -       +      +
    203A  ALA*     3.6    13.7    -      -       +      +
    206A  TYR*     3.4    41.5    -      -       +      -
    326A  PHE*     4.0    14.4    -      -       +      -
    337A  VAL*     2.9    42.6    +      -       +      +
    338A  PHE*     3.9    13.0    -      -       +      +
    340A  LEU*     1.3    70.2    -      -       +      +
    342A  ASN*     1.3    66.1    +      -       -      +
    344A  VAL*     4.6     5.4    -      -       -      +
    345A  LEU*     2.9    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  VAL*     3.7    16.0    -      -       -      +
    323A  VAL      3.1    22.6    +      -       -      +
    324A  HIS*     3.8    18.3    +      -       -      +
    325A  LEU*     3.1    28.2    +      -       -      +
    326A  PHE*     3.7    19.1    +      -       +      -
    338A  PHE      2.9    21.0    +      -       -      +
    339A  ASP*     3.3    16.0    +      -       -      +
    340A  LEU      3.2     0.2    -      -       -      -
    341A  LEU*     1.3    75.6    -      -       -      +
    343A  SER*     1.3    56.4    +      -       -      +
    345A  LEU*     3.5     1.1    -      -       -      +
    346A  VAL*     2.8    41.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318A  CYS*     3.6    17.9    -      -       -      -
    319A  PRO*     3.0    41.2    +      -       -      +
    321A  VAL*     4.1    16.6    +      -       -      +
    339A  ASP*     2.9    13.0    +      -       -      -
    340A  LEU*     2.7    16.4    +      -       -      -
    342A  ASN*     1.3    71.0    -      -       -      +
    344A  VAL*     1.3    57.2    +      -       -      -
    346A  VAL*     3.8     1.0    -      -       -      +
    347A  THR*     2.4    34.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  PRO*     4.4    17.0    -      -       +      -
    190A  ASN      5.9     1.1    -      -       -      +
    191A  PHE*     4.5    17.3    -      -       +      -
    197A  CYS*     4.9     1.8    -      -       -      -
    199A  ILE*     4.4    14.1    -      -       +      -
    200A  PHE*     3.7    37.7    -      -       +      +
    203A  ALA*     5.1     1.1    -      -       +      -
    340A  LEU*     2.9    33.5    +      -       +      +
    341A  LEU*     4.1     5.6    -      -       -      +
    343A  SER*     1.3    74.8    -      -       -      +
    345A  LEU*     1.3    64.9    +      -       -      +
    347A  THR*     2.9     7.5    +      -       -      -
    348A  SER*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200A  PHE*     4.0    10.4    -      -       +      -
    203A  ALA*     3.6     7.0    -      -       +      +
    204A  VAL*     3.5    47.6    -      -       +      +
    207A  TYR*     4.7     7.6    -      -       +      -
    325A  LEU*     3.7    34.1    -      -       +      -
    326A  PHE*     3.9    22.0    -      -       +      -
    341A  LEU      2.9    19.9    +      -       -      +
    342A  ASN*     3.5     3.4    -      -       -      +
    344A  VAL*     1.3    77.5    -      -       -      +
    346A  VAL*     1.3    58.4    +      -       +      +
    348A  SER      3.3     0.3    +      -       -      -
    349A  LEU*     2.8    46.0    +      -       +      +
    361A  ILE*     4.5     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  VAL*     3.0    34.5    -      -       +      -
    323A  VAL*     3.4    24.7    -      -       +      +
    325A  LEU*     3.8    22.7    -      -       +      -
    342A  ASN*     2.8    31.4    +      -       -      +
    343A  SER      4.1     2.0    -      -       -      +
    345A  LEU*     1.3    74.8    -      -       +      +
    347A  THR*     1.3    63.4    +      -       -      +
    349A  LEU*     4.4     5.6    -      -       -      -
    350A  PRO*     3.4    15.2    -      -       -      +
    375A  PHE*     3.8    22.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191A  PHE*     4.3    21.1    -      -       +      -
    319A  PRO*     3.5    22.4    -      -       +      +
    321A  VAL*     5.4     3.5    -      -       -      +
    343A  SER      2.4    30.4    +      -       -      -
    344A  VAL*     3.3     7.4    -      -       -      -
    346A  VAL*     1.3    81.5    -      -       -      +
    348A  SER*     1.3    64.4    +      -       -      +
    350A  PRO*     3.6     8.5    -      -       -      +
    381A  PRO*     3.8    20.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 348 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  ASN      5.4     0.3    +      -       -      -
    191A  PHE*     5.0     8.0    +      -       -      -
    194A  PRO*     3.4    35.4    -      -       -      +
    200A  PHE*     3.6    28.7    -      -       -      -
    344A  VAL*     2.9    12.7    +      -       -      +
    345A  LEU      3.7     0.4    -      -       -      -
    347A  THR*     1.3    80.3    -      -       -      +
    349A  LEU*     1.3    64.2    +      -       -      +
    350A  PRO*     3.3     3.4    -      -       -      -
    351A  LEU*     3.1    15.2    +      -       -      +
    352A  LEU      3.3     9.0    +      -       -      -
    381A  PRO*     4.8     7.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 349 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200A  PHE*     4.4     7.9    -      -       +      -
    325A  LEU*     3.7    29.8    -      -       +      -
    345A  LEU*     2.8    25.8    +      -       +      +
    346A  VAL*     4.3     3.8    -      -       -      +
    348A  SER*     1.3    75.4    -      -       -      +
    350A  PRO*     1.3    72.8    -      -       +      +
    352A  LEU*     3.2    31.5    +      -       +      +
    353A  TYR*     3.1    21.8    +      -       -      +
    361A  ILE*     4.1    22.0    -      -       +      -
    362A  PHE*     4.1    12.7    -      -       +      -
    367A  LEU*     4.2    16.2    -      -       +      -
    375A  PHE*     4.7     3.4    -      -       +      -
    376A  LEU*     4.4     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 350 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346A  VAL      3.4    16.6    -      -       -      +
    347A  THR      3.6     8.7    -      -       -      +
    348A  SER      3.4     3.6    -      -       -      -
    349A  LEU*     1.3    93.0    -      -       +      +
    351A  LEU*     1.3    64.5    +      -       -      +
    353A  TYR*     3.2    13.2    +      -       +      +
    354A  ARG*     3.2    16.8    +      -       -      +
    375A  PHE*     4.2    24.2    -      -       +      +
    376A  LEU*     4.1    21.8    -      -       +      +
    379A  THR      4.4    10.5    -      -       -      +
    380A  LEU*     4.2     5.8    -      -       +      -
    381A  PRO*     3.8    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 351 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194A  PRO*     4.0    23.3    -      -       +      -
    195A  PHE*     3.9    28.7    -      -       +      -
    348A  SER      3.1    12.0    +      -       -      +
    350A  PRO*     1.3    79.1    -      -       -      +
    352A  LEU*     1.3    66.2    +      -       -      +
    354A  ARG*     2.8    17.8    +      -       +      +
    355A  VAL*     3.1    18.1    +      -       +      +
    380A  LEU*     4.3    17.9    -      -       +      -
    381A  PRO*     3.7    15.9    -      -       +      +
    382A  LEU*     3.9    24.5    -      -       +      +
    383A  ASP      5.5     0.2    -      -       -      +
    384A  ILE*     5.1    12.6    -      -       +      -
    387A  GLN*     4.3    18.4    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    118A  TRP*     4.3    15.5    -      -       +      -
    195A  PHE*     3.8    28.2    -      -       +      -
    200A  PHE*     4.1    22.9    -      -       +      -
    204A  VAL*     4.5     9.2    -      -       +      -
    348A  SER      3.3     2.4    +      -       -      -
    349A  LEU*     3.2    30.8    +      -       +      +
    351A  LEU*     1.3    79.2    -      -       -      +
    353A  TYR*     1.3    54.4    +      -       -      +
    356A  PHE*     2.8    54.0    +      -       +      -
    359A  HIS*     4.4    13.2    -      -       +      +
    361A  ILE*     4.3     9.4    -      -       +      -
    362A  PHE*     4.0    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 353 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349A  LEU      3.1     7.7    +      -       -      +
    350A  PRO*     3.4    11.2    -      -       +      +
    351A  LEU      3.0     0.4    -      -       -      -
    352A  LEU*     1.3    77.8    -      -       -      +
    354A  ARG*     1.3    82.0    +      -       -      +
    357A  PRO*     3.2    37.7    -      -       +      +
    362A  PHE*     3.2    50.5    -      +       +      -
    373A  ILE*     3.8    22.5    -      -       +      +
    376A  LEU*     3.8    37.5    -      -       +      -
    377A  THR*     4.7     5.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 354 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350A  PRO      3.4    13.2    -      -       -      +
    351A  LEU*     2.8    10.3    +      -       +      +
    353A  TYR*     1.3    92.6    -      -       +      +
    355A  VAL*     1.3    63.1    +      -       +      +
    357A  PRO*     4.4     3.3    -      -       -      +
    376A  LEU      4.2     7.4    +      -       -      +
    377A  THR*     3.4    45.7    +      -       -      +
    378A  GLY      5.3     1.8    +      -       -      -
    380A  LEU*     3.5    30.7    -      -       +      +
    384A  ILE*     6.1     3.4    -      -       +      -
    400A  THR*     4.8     9.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 355 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  PHE*     4.1    20.6    -      -       +      -
    351A  LEU*     3.1    19.3    +      -       +      +
    352A  LEU      4.0     0.9    -      -       -      +
    354A  ARG*     1.3    77.8    -      -       +      +
    356A  PHE*     1.3    99.2    +      -       +      +
    357A  PRO*     3.0    13.3    -      -       -      +
    384A  ILE*     4.4    22.0    -      -       +      -
    387A  GLN*     5.8     1.8    -      -       +      -
    391A  LEU*     5.8     9.9    -      -       +      -
    398A  THR*     4.6     4.5    +      -       +      +
    400A  THR*     3.5    16.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 356 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115A  ILE*     4.2    17.5    -      -       +      -
    118A  TRP*     3.9    21.8    -      -       +      +
    119A  ASN*     3.2    38.1    -      -       +      -
    120A  PRO*     3.1    30.1    -      -       +      -
    195A  PHE*     4.3     9.0    -      +       -      -
    352A  LEU*     2.8    36.5    +      -       +      +
    355A  VAL*     1.3   104.2    -      -       +      +
    357A  PRO*     1.3    55.5    -      -       -      +
    358A  THR*     2.9    14.2    +      -       -      +
    359A  HIS*     3.0    20.1    +      -       +      +
    362A  PHE*     3.2     6.6    -      -       -      -
    394A  LEU*     4.6     4.3    -      -       +      -
    398A  THR*     4.1    15.0    -      -       +      -
----------------------------------------------------------
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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