Contacts of the helix formed by residues 317 - 350 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312B  LEU      3.9     0.6    +      -       -      +
    313B  ARG*     3.3    18.2    +      -       -      +
    314B  ILE      3.4     0.6    +      -       -      -
    316B  LEU*     1.3    80.4    -      -       -      +
    318B  SER*     1.3    63.6    +      -       -      +
    319B  LEU      3.5     0.2    -      -       -      -
    320B  PRO*     3.7     3.8    -      -       -      +
    321B  PHE*     3.2    23.2    +      -       -      +
    387B  TRP*     4.4    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 318 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313B  ARG      3.4     2.8    +      -       -      -
    314B  ILE*     2.9    24.5    +      -       -      -
    317B  VAL*     1.3    78.6    -      -       -      +
    319B  LEU*     1.3    53.1    +      -       -      +
    321B  PHE*     3.0     7.3    +      -       -      +
    322B  VAL*     2.7    35.9    +      -       -      +
    384B  LEU*     5.2    19.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 319 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314B  ILE      3.2     8.7    +      -       -      +
    315B  TYR*     4.6    10.8    -      -       -      +
    318B  SER*     1.3    78.5    -      -       -      +
    320B  PRO*     1.4    64.5    -      -       +      +
    322B  VAL*     3.8     7.2    -      -       -      +
    323B  CYS*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 320 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315B  TYR      4.5     2.0    -      -       -      +
    316B  LEU*     3.3    39.0    -      -       -      +
    317B  VAL*     3.7     4.7    -      -       -      +
    319B  LEU*     1.4    91.8    -      -       +      +
    321B  PHE*     1.3    56.8    +      -       -      +
    323B  CYS*     3.7     6.6    -      -       +      +
    324B  LEU*     2.8    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 321 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317B  VAL      3.2    19.6    +      -       -      +
    318B  SER*     3.0     7.7    +      -       -      +
    320B  PRO*     1.3    73.9    -      -       -      +
    322B  VAL*     1.3    60.5    +      -       -      +
    324B  LEU*     3.4     6.1    +      -       -      +
    325B  CYS*     3.0    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 322 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318B  SER      2.7    18.7    +      -       -      +
    319B  LEU*     3.8     9.0    -      -       -      +
    321B  PHE*     1.3    72.7    -      -       -      +
    323B  CYS*     1.3    58.1    +      -       -      +
    325B  CYS*     3.3     6.2    +      -       -      +
    326B  LEU*     2.8    29.7    +      -       -      +
    403B  LYS*     6.0     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 323 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319B  LEU      2.9    18.5    +      -       -      +
    320B  PRO*     3.7     7.9    -      -       +      +
    322B  VAL*     1.3    73.5    -      -       -      +
    324B  LEU*     1.3    59.4    +      -       -      +
    326B  LEU*     3.6     8.1    -      -       -      +
    327B  TYR*     2.8    30.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 324 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320B  PRO      2.8    20.4    +      -       -      +
    321B  PHE*     3.7     7.6    -      -       -      +
    322B  VAL      3.3     0.2    -      -       -      -
    323B  CYS*     1.3    73.2    -      -       -      +
    325B  CYS*     1.3    57.9    +      -       -      +
    327B  TYR*     3.4     6.3    +      -       -      +
    328B  PHE*     3.0    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 325 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321B  PHE      3.0    17.6    +      -       -      +
    322B  VAL*     3.8     6.1    -      -       -      +
    324B  LEU*     1.3    74.3    -      -       -      +
    326B  LEU*     1.3    60.0    +      -       -      +
    328B  PHE*     3.4     6.6    +      -       -      +
    329B  SER*     3.0    29.0    +      -       -      -
    377B  TYR*     5.8     4.7    -      -       +      -
    407B  PHE*     4.2    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 326 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322B  VAL      2.8    17.2    +      -       -      +
    323B  CYS*     3.6     9.2    -      -       -      +
    325B  CYS*     1.3    75.0    -      -       -      +
    327B  TYR*     1.3    59.5    +      -       -      +
    329B  SER*     3.3     6.6    +      -       -      -
    330B  LEU*     2.9    29.5    +      -       -      +
    407B  PHE*     5.2     5.3    -      -       +      -
    410B  LEU*     5.9     7.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 327 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323B  CYS      2.8    18.2    +      -       -      +
    324B  LEU*     3.7     8.1    -      -       -      +
    325B  CYS      3.3     0.2    -      -       -      -
    326B  LEU*     1.3    78.6    -      -       -      +
    328B  PHE*     1.3    56.0    +      -       -      +
    330B  LEU*     3.3     6.7    +      -       -      +
    331B  TYR*     2.8    29.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 328 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324B  LEU      3.0    16.9    +      -       -      +
    325B  CYS*     3.9     6.3    -      -       -      +
    327B  TYR*     1.3    74.8    -      -       -      +
    329B  SER*     1.3    59.9    +      -       -      +
    331B  TYR*     3.6     7.0    -      -       -      +
    332B  VAL*     2.8    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 329 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325B  CYS      3.0    18.1    +      -       -      -
    326B  LEU*     3.6     7.4    -      -       -      -
    327B  TYR      3.3     0.2    -      -       -      -
    328B  PHE*     1.3    74.5    -      -       -      +
    330B  LEU*     1.3    60.1    +      -       -      +
    332B  VAL*     3.4     6.1    +      -       -      +
    333B  MET*     2.9    27.4    +      -       -      +
    373B  MET*     6.4     0.2    -      -       -      -
    407B  PHE*     4.1    20.6    -      -       -      -
    410B  LEU*     5.9     4.9    -      -       -      -
    411B  ASN*     5.5    11.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 330 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326B  LEU      2.9    17.5    +      -       -      +
    327B  TYR*     3.7     7.0    -      -       -      +
    329B  SER*     1.3    76.4    -      -       -      +
    331B  TYR*     1.3    57.3    +      -       -      +
    333B  MET*     3.3     8.0    +      -       -      +
    334B  MET*     2.9    28.6    +      -       -      +
    414B  ALA*     6.3     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 331 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327B  TYR      2.8    18.1    +      -       -      +
    328B  PHE*     3.6     8.7    -      -       -      +
    329B  SER      3.2     0.2    -      -       -      -
    330B  LEU*     1.3    75.2    -      -       -      +
    332B  VAL*     1.3    59.5    +      -       -      +
    334B  MET*     3.3     6.3    +      -       -      +
    335B  ILE*     2.8    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 332 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328B  PHE      2.8    17.0    +      -       -      +
    329B  SER*     3.8     7.0    -      -       -      +
    331B  TYR*     1.3    74.0    -      -       -      +
    333B  MET*     1.3    59.4    +      -       -      +
    335B  ILE*     3.6     8.5    -      -       -      +
    336B  TYR*     2.9    29.1    +      -       -      +
    369B  VAL*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 333 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329B  SER      2.9    19.1    +      -       -      +
    330B  LEU*     3.4     9.4    -      -       -      +
    331B  TYR      3.2     0.2    -      -       -      -
    332B  VAL*     1.3    76.8    -      -       -      +
    334B  MET*     1.3    57.6    +      -       -      +
    336B  TYR*     3.2    10.6    +      -       +      +
    337B  PHE*     3.0    42.8    +      -       +      -
    414B  ALA*     4.9    16.8    -      -       +      -
    415B  SER*     5.9     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 334 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330B  LEU      2.9    16.7    +      -       -      +
    331B  TYR*     3.7     6.7    -      -       -      +
    333B  MET*     1.3    71.9    -      -       -      +
    335B  ILE*     1.3    61.5    +      -       -      +
    337B  PHE*     3.3    10.3    +      -       -      +
    338B  ASP*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 335 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331B  TYR      2.8    17.9    +      -       -      +
    332B  VAL*     3.6     9.9    -      -       -      +
    333B  MET      3.3     0.2    -      -       -      -
    334B  MET*     1.3    77.2    -      -       -      +
    336B  TYR*     1.3    55.7    +      -       -      +
    338B  ASP*     3.4     7.0    +      -       -      +
    339B  MET*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 336 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332B  VAL      2.9    18.9    +      -       -      +
    333B  MET*     3.2    11.9    +      -       +      +
    335B  ILE*     1.3    77.3    -      -       -      +
    337B  PHE*     1.3    81.9    +      +       -      +
    339B  MET*     3.3     6.7    +      -       +      +
    340B  GLU*     2.7    33.7    +      -       +      +
    362B  PRO*     3.4    45.6    -      -       +      +
    363B  SER*     3.4    22.6    +      -       -      -
    366B  TYR*     3.7    19.1    -      -       +      -
    415B  SER*     4.6    16.4    -      -       -      -
    432B  SER*     5.2     9.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 337 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333B  MET*     3.0    34.7    +      -       +      -
    334B  MET*     3.8    10.1    -      -       -      +
    335B  ILE      3.3     0.4    -      -       -      -
    336B  TYR*     1.3    90.0    -      +       -      +
    338B  ASP*     1.3    60.9    +      -       -      +
    340B  GLU*     3.5     9.5    -      -       +      +
    341B  VAL*     2.9    30.0    +      -       -      +
    414B  ALA      5.1     0.7    -      -       -      -
    415B  SER*     4.1    26.7    -      -       -      -
    418B  TYR*     3.6    33.9    -      -       +      -
    419B  ILE*     5.3     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 338 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334B  MET      3.0    16.8    +      -       -      +
    335B  ILE*     3.7     7.6    -      -       -      +
    337B  PHE*     1.3    76.5    -      -       -      +
    339B  MET*     1.3    56.7    +      -       -      +
    341B  VAL*     3.5     5.6    +      -       -      +
    342B  TRP*     3.0    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 339 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335B  ILE      3.0    14.3    +      -       -      +
    336B  TYR*     3.5    11.7    -      -       +      +
    338B  ASP*     1.3    75.8    -      -       -      +
    340B  GLU*     1.3    59.2    +      -       -      +
    342B  TRP*     3.7    13.4    -      -       +      +
    343B  ALA*     2.8    30.3    +      -       -      +
    362B  PRO*     5.1    13.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 340 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  TYR*     2.7    35.0    +      -       +      +
    337B  PHE*     3.3    15.7    +      -       +      +
    339B  MET*     1.3    72.4    -      -       -      +
    341B  VAL*     1.3    54.4    +      -       -      +
    343B  ALA*     3.3     5.9    +      -       -      +
    344B  LEU*     2.7    35.2    +      -       -      +
    362B  PRO*     5.0     7.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 341 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337B  PHE      2.9    17.3    +      -       -      +
    338B  ASP*     4.0     6.3    -      -       -      +
    340B  GLU*     1.3    73.0    -      -       -      +
    342B  TRP*     1.3    60.4    +      -       -      +
    344B  LEU*     3.6     7.8    -      -       -      +
    345B  GLY*     2.8    25.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 342 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338B  ASP      3.0    18.5    +      -       -      +
    339B  MET*     3.7    14.4    -      -       +      +
    341B  VAL*     1.3    77.9    -      -       -      +
    343B  ALA*     1.3    72.3    +      -       +      +
    345B  GLY*     3.3     2.8    +      -       -      +
    346B  LEU*     2.7    44.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 343 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339B  MET      2.8    18.3    +      -       -      +
    340B  GLU*     3.7     7.2    -      -       -      +
    342B  TRP*     1.3    88.8    -      -       +      +
    344B  LEU*     1.3    56.8    +      -       -      +
    346B  LEU*     3.5     6.2    -      -       +      +
    347B  HIS*     2.7    34.0    +      -       -      +
    358B  LEU*     5.1     9.0    -      -       +      +
    359B  LEU*     5.5     6.6    -      -       +      +
    362B  PRO*     4.8    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 344 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340B  GLU      2.7    21.0    +      -       -      +
    341B  VAL*     3.6     9.4    -      -       -      +
    343B  ALA*     1.3    73.7    -      -       -      +
    345B  GLY*     1.3    57.4    +      -       -      +
    347B  HIS*     3.2     8.4    +      -       -      +
    348B  GLU*     2.7    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 345 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341B  VAL      2.8    15.2    +      -       -      -
    342B  TRP*     3.6     4.0    -      -       -      -
    344B  LEU*     1.3    76.4    -      -       -      +
    346B  LEU*     1.3    56.3    +      -       -      +
    348B  GLU*     3.2    10.5    +      -       -      +
    349B  ASN*     2.8    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 346 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342B  TRP*     2.7    36.7    +      -       +      +
    343B  ALA*     3.2    11.4    +      -       -      +
    345B  GLY*     1.3    72.5    -      -       -      +
    347B  HIS*     1.3    61.6    +      -       -      +
    349B  ASN*     3.7     7.1    -      -       -      +
    350B  SER*     3.1    27.0    +      -       -      -
    355B  THR*     4.9     1.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 347 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343B  ALA      2.7    19.5    +      -       -      +
    344B  LEU*     3.5     9.4    -      -       -      +
    346B  LEU*     1.3    73.6    -      -       -      +
    348B  GLU*     1.3    62.4    +      -       -      +
    349B  ASN      3.4     0.3    +      -       -      -
    351B  GLY      3.0    25.3    +      -       -      +
    355B  THR*     3.6    32.8    -      -       -      +
    359B  LEU*     5.8     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 348 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344B  LEU      2.7    16.7    +      -       -      +
    345B  GLY*     3.4    11.4    -      -       -      +
    347B  HIS*     1.3    77.9    -      -       -      +
    349B  ASN*     1.3    60.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 349 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345B  GLY      2.8    15.6    +      -       -      +
    346B  LEU*     3.7     8.7    -      -       -      +
    347B  HIS      3.2     0.4    -      -       -      -
    348B  GLU*     1.3    81.3    -      -       -      +
    350B  SER*     1.3    69.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 350 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346B  LEU      3.1    12.5    +      -       -      -
    348B  GLU      3.8     0.2    -      -       -      -
    349B  ASN*     1.3    82.2    -      -       -      +
    351B  GLY*     1.3    60.7    +      -       -      +
    355B  THR*     5.1     6.1    -      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il