Contacts of the helix formed by residues 317 - 350 (chain A) in PDB entry 6R7Z


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 VAL 317 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312A  LEU      3.9     0.4    +      -       -      +
    313A  ARG*     3.3    17.8    +      -       -      +
    314A  ILE      3.4     1.0    +      -       -      -
    316A  LEU*     1.3    80.5    -      -       +      +
    318A  SER*     1.3    64.5    +      -       -      +
    319A  LEU      3.5     0.4    -      -       -      -
    320A  PRO*     3.7     3.4    -      -       -      +
    321A  PHE*     3.2    23.6    +      -       -      +
    387A  TRP*     4.4    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 318 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  ARG      3.4     3.2    +      -       -      -
    314A  ILE*     2.9    24.3    +      -       -      -
    317A  VAL*     1.3    79.5    -      -       -      +
    319A  LEU*     1.3    51.4    +      -       -      +
    321A  PHE*     3.0     7.6    +      -       -      +
    322A  VAL*     2.7    36.3    +      -       -      +
    384A  LEU*     5.2    19.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 319 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314A  ILE      3.2     7.6    +      -       -      +
    315A  TYR*     4.6    11.9    -      -       -      +
    318A  SER*     1.3    79.3    -      -       -      +
    320A  PRO*     1.4    64.5    -      -       +      +
    322A  VAL*     3.8     7.7    -      -       -      +
    323A  CYS*     2.9    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 320 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  TYR      4.5     1.6    -      -       -      +
    316A  LEU*     3.3    38.8    -      -       -      +
    317A  VAL*     3.7     5.6    -      -       -      +
    319A  LEU*     1.4    92.8    -      -       +      +
    321A  PHE*     1.3    56.2    +      -       -      +
    323A  CYS*     3.7     7.4    -      -       +      +
    324A  LEU*     2.8    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 321 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  VAL      3.2    19.2    +      -       -      +
    318A  SER*     3.0     9.4    +      -       -      +
    320A  PRO*     1.3    73.9    -      -       -      +
    322A  VAL*     1.3    60.6    +      -       -      +
    324A  LEU*     3.4     7.2    +      -       -      +
    325A  CYS*     3.0    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 322 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318A  SER      2.7    19.5    +      -       -      +
    319A  LEU*     3.8     8.1    -      -       -      +
    320A  PRO      3.3     0.2    -      -       -      -
    321A  PHE*     1.3    72.4    -      -       -      +
    323A  CYS*     1.3    58.3    +      -       -      +
    325A  CYS*     3.3     5.9    +      -       -      +
    326A  LEU*     2.8    29.7    +      -       -      +
    403A  LYS*     6.0     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 323 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319A  LEU      2.9    18.6    +      -       -      +
    320A  PRO*     3.7     8.3    -      -       +      +
    322A  VAL*     1.3    75.3    -      -       -      +
    324A  LEU*     1.3    59.1    +      -       -      +
    326A  LEU*     3.3     7.0    +      -       -      +
    327A  TYR*     2.8    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 324 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  PRO      2.8    21.2    +      -       -      +
    321A  PHE*     3.7     7.4    -      -       -      +
    322A  VAL      3.3     0.2    -      -       -      -
    323A  CYS*     1.3    72.6    -      -       -      +
    325A  CYS*     1.3    58.3    +      -       -      +
    327A  TYR*     3.4     7.1    +      -       -      +
    328A  PHE*     3.0    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 325 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  PHE      3.0    17.2    +      -       -      +
    322A  VAL*     3.8     6.5    -      -       -      +
    324A  LEU*     1.3    75.6    -      -       -      +
    326A  LEU*     1.3    58.7    +      -       -      +
    328A  PHE*     3.4     6.8    +      -       -      +
    329A  SER*     3.0    28.4    +      -       -      -
    377A  TYR*     5.8     4.9    -      -       +      -
    407A  PHE*     4.2    20.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  VAL      2.8    17.9    +      -       -      +
    323A  CYS*     3.6     8.5    -      -       -      +
    325A  CYS*     1.3    75.2    -      -       -      +
    327A  TYR*     1.3    58.9    +      -       -      +
    329A  SER*     3.3     6.8    +      -       -      -
    330A  LEU*     2.9    28.4    +      -       -      +
    407A  PHE*     5.2     5.3    -      -       +      -
    410A  LEU*     5.9     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  CYS      2.8    18.4    +      -       -      +
    324A  LEU*     3.7     7.6    -      -       -      +
    325A  CYS      3.3     0.2    -      -       -      -
    326A  LEU*     1.3    76.4    -      -       -      +
    328A  PHE*     1.3    56.3    +      -       -      +
    330A  LEU*     3.3     6.9    +      -       -      +
    331A  TYR*     2.8    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  LEU      3.0    17.1    +      -       -      +
    325A  CYS*     3.9     6.7    -      -       -      +
    327A  TYR*     1.3    73.0    -      -       -      +
    329A  SER*     1.3    60.6    +      -       -      +
    331A  TYR*     3.6     7.9    -      -       -      +
    332A  VAL*     2.8    30.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  CYS      3.0    17.8    +      -       -      -
    326A  LEU*     3.6     7.2    -      -       -      -
    328A  PHE*     1.3    74.7    -      -       -      +
    330A  LEU*     1.3    58.9    +      -       -      +
    332A  VAL*     3.4     6.1    +      -       -      +
    333A  MET*     2.9    27.9    +      -       -      +
    373A  MET*     6.4     0.7    -      -       -      -
    407A  PHE*     4.1    20.6    -      -       -      -
    410A  LEU*     5.9     5.2    -      -       -      -
    411A  ASN*     5.5    12.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 330 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  LEU      2.9    17.2    +      -       -      +
    327A  TYR*     3.7     7.4    -      -       -      +
    329A  SER*     1.3    76.1    -      -       -      +
    331A  TYR*     1.3    58.3    +      -       -      +
    333A  MET*     3.3     9.2    +      -       -      +
    334A  MET*     2.9    28.8    +      -       -      +
    414A  ALA*     6.3     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 331 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327A  TYR      2.8    18.3    +      -       -      +
    328A  PHE*     3.6     9.0    -      -       -      +
    330A  LEU*     1.3    74.1    -      -       -      +
    332A  VAL*     1.3    59.6    +      -       -      +
    334A  MET*     3.3     7.9    +      -       -      +
    335A  ILE*     2.8    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328A  PHE      2.8    17.6    +      -       -      +
    329A  SER*     3.8     6.5    -      -       -      +
    331A  TYR*     1.3    73.7    -      -       -      +
    333A  MET*     1.3    59.5    +      -       -      +
    335A  ILE*     3.6     8.5    -      -       -      +
    336A  TYR*     2.9    28.9    +      -       -      +
    369A  VAL*     6.5     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  SER      2.9    17.4    +      -       -      +
    330A  LEU*     3.4    10.5    -      -       -      +
    331A  TYR      3.2     0.2    -      -       -      -
    332A  VAL*     1.3    77.2    -      -       -      +
    334A  MET*     1.3    57.3    +      -       -      +
    336A  TYR*     3.2    10.9    +      -       +      +
    337A  PHE*     3.0    41.9    +      -       +      -
    414A  ALA*     4.9    17.3    -      -       +      -
    415A  SER*     5.9     2.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  LEU      2.9    15.8    +      -       -      +
    331A  TYR*     3.7     7.2    -      -       -      +
    333A  MET*     1.3    73.4    -      -       -      +
    335A  ILE*     1.3    60.2    +      -       -      +
    337A  PHE*     3.3    10.7    +      -       -      +
    338A  ASP*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  TYR      2.8    18.3    +      -       -      +
    332A  VAL*     3.6     9.9    -      -       -      +
    334A  MET*     1.3    76.8    -      -       -      +
    336A  TYR*     1.3    56.6    +      -       -      +
    338A  ASP*     3.4     7.3    +      -       -      +
    339A  MET*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332A  VAL      2.9    17.4    +      -       -      +
    333A  MET*     3.2    12.1    +      -       -      +
    335A  ILE*     1.3    76.8    -      -       -      +
    337A  PHE*     1.3    80.4    +      +       -      +
    339A  MET*     3.3     6.3    +      -       +      +
    340A  GLU*     2.7    32.9    +      -       +      +
    362A  PRO*     3.4    46.0    -      -       +      +
    363A  SER*     3.4    23.2    -      -       -      -
    366A  TYR*     3.7    16.8    -      -       +      -
    415A  SER*     4.7    16.2    -      -       -      -
    432A  SER*     5.2     8.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  MET*     3.0    33.8    +      -       +      -
    334A  MET*     3.8     9.2    -      -       -      +
    335A  ILE      3.3     0.2    -      -       -      -
    336A  TYR*     1.3    88.9    -      +       -      +
    338A  ASP*     1.3    60.8    +      -       -      +
    340A  GLU*     3.5    10.1    -      -       +      +
    341A  VAL*     2.9    29.5    +      -       -      +
    414A  ALA      5.1     0.7    -      -       -      -
    415A  SER*     4.1    26.7    -      -       -      -
    418A  TYR*     3.6    33.7    -      -       +      -
    419A  ILE*     5.3     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334A  MET      3.0    16.6    +      -       -      +
    335A  ILE*     3.7     7.0    -      -       -      +
    336A  TYR      3.3     0.2    -      -       -      -
    337A  PHE*     1.3    75.5    -      -       -      +
    339A  MET*     1.3    58.1    +      -       -      +
    341A  VAL*     3.9     5.2    -      -       -      +
    342A  TRP*     3.0    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  ILE      3.0    14.1    +      -       -      +
    336A  TYR*     3.3    12.1    +      -       +      +
    338A  ASP*     1.3    75.7    -      -       -      +
    340A  GLU*     1.3    57.7    +      -       -      +
    342A  TRP*     3.4    13.3    +      -       +      +
    343A  ALA*     2.8    30.7    +      -       -      +
    362A  PRO*     5.1    12.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  TYR*     2.7    36.5    +      -       +      +
    337A  PHE*     3.3    16.1    +      -       +      +
    339A  MET*     1.3    72.8    -      -       -      +
    341A  VAL*     1.3    55.2    +      -       -      +
    343A  ALA*     3.3     5.9    +      -       -      +
    344A  LEU*     2.7    35.0    +      -       -      +
    362A  PRO*     5.0     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  PHE      2.9    16.3    +      -       -      +
    338A  ASP*     4.0     5.8    -      -       -      +
    340A  GLU*     1.3    72.8    -      -       -      +
    342A  TRP*     1.3    60.6    +      -       -      +
    344A  LEU*     3.3     7.6    +      -       -      +
    345A  GLY*     2.8    24.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  ASP      3.0    19.0    +      -       -      +
    339A  MET*     3.7    13.0    -      -       +      +
    341A  VAL*     1.3    76.4    -      -       -      +
    343A  ALA*     1.3    73.7    +      -       +      +
    345A  GLY*     3.3     2.4    +      -       -      -
    346A  LEU*     2.7    43.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339A  MET      2.8    18.3    +      -       -      +
    340A  GLU*     3.7     7.0    -      -       -      +
    342A  TRP*     1.3    86.4    -      -       +      +
    344A  LEU*     1.3    57.3    +      -       -      +
    346A  LEU*     3.5     6.6    -      -       -      +
    347A  HIS*     2.7    33.3    +      -       -      +
    358A  LEU*     5.1     8.7    -      -       +      +
    359A  LEU*     5.5     7.2    -      -       -      +
    362A  PRO*     4.8    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  GLU      2.7    22.3    +      -       -      +
    341A  VAL*     3.6     9.2    -      -       -      +
    342A  TRP      3.3     0.2    -      -       -      -
    343A  ALA*     1.3    73.9    -      -       -      +
    345A  GLY*     1.3    56.7    +      -       -      +
    347A  HIS*     3.2     7.9    +      -       -      +
    348A  GLU*     2.7    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  VAL      2.8    14.8    +      -       -      -
    342A  TRP*     3.5     4.0    -      -       -      -
    344A  LEU*     1.3    77.0    -      -       -      +
    346A  LEU*     1.3    57.1    +      -       -      +
    348A  GLU*     3.2    10.9    +      -       -      +
    349A  ASN*     2.8    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  TRP*     2.7    37.6    +      -       +      +
    343A  ALA*     3.2    10.7    +      -       +      +
    345A  GLY*     1.3    71.8    -      -       -      +
    347A  HIS*     1.3    63.0    +      -       -      +
    349A  ASN*     3.7     7.1    -      -       -      +
    350A  SER*     3.1    27.2    +      -       -      -
    355A  THR*     4.9     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343A  ALA      2.7    20.3    +      -       -      +
    344A  LEU*     3.5     9.6    -      -       -      +
    346A  LEU*     1.3    72.4    -      -       -      +
    348A  GLU*     1.3    62.6    +      -       -      +
    349A  ASN      3.4     0.3    +      -       -      -
    351A  GLY      3.0    25.9    +      -       -      +
    355A  THR*     3.6    31.0    -      -       -      +
    359A  LEU*     5.8     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 348 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344A  LEU      2.7    17.2    +      -       -      +
    345A  GLY*     3.2    11.4    +      -       -      +
    347A  HIS*     1.3    79.2    -      -       -      +
    349A  ASN*     1.3    59.6    +      -       -      +
    351A  GLY      5.3     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 349 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345A  GLY      2.8    15.6    +      -       -      +
    346A  LEU*     3.7     8.3    -      -       -      +
    347A  HIS      3.2     0.6    -      -       -      -
    348A  GLU*     1.3    81.0    -      -       -      +
    350A  SER*     1.3    69.1    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    346A  LEU      3.1    13.6    +      -       -      -
    348A  GLU      3.8     0.2    -      -       -      -
    349A  ASN*     1.3    83.8    -      -       -      +
    351A  GLY*     1.3    60.3    -      -       -      +
    355A  THR*     5.1     5.6    -      -       -      -
----------------------------------------------------------
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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