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Area of Science:

  • Biochemistry
  • Structural Biology
  • Microbiology

Background:

  • Staphylococcus aureus formate dehydrogenase (SauFDH) is vital for pathogen survival in biofilms.
  • Understanding SauFDH structure can guide the development of specific inhibitors for antibacterial agents.
  • Targeting S. aureus biofilms is crucial for combating infections.

Purpose of the Study:

  • To produce recombinant SauFDH in high yield.
  • To determine the three-dimensional structure of SauFDH.
  • To obtain crystals for X-ray analysis.

Main Methods:

  • Recombinant expression of SauFDH in E. coli.
  • Enzyme purification and activity assays.
  • Crystallization and X-ray diffraction analysis using synchrotron sources.

Main Results:

  • High yield (1 g/L) and purity (61% yield, 400 mg) of recombinant SauFDH achieved.
  • Specific activity of purified SauFDH was 20 U/mg, twice that of previously reported enzymes.
  • Successfully obtained crystals and solved the 3D structures of apo- and holo-SauFDH at 2.2 and 2.7 Å resolution, respectively.

Conclusions:

  • The study provides the 3D structures of SauFDH apo- and holoenzymes.
  • Different crystal space groups for apo- and holo-SauFDH suggest coenzyme binding influences structure.
  • The structural data can facilitate the design of novel antibacterial agents targeting S. aureus biofilms.