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Among the recombinant TSPOs, the BcTSPO.

Leeyah Issop1, Luminita Duma2, Stephanie Finet3

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Bacillus cereus TSPO (BcTSPO) binds various ligands, including heme biosynthesis intermediate PPIX. Light and oxygen exposure degrades PPIX within BcTSPO, suggesting a role in scavenging reactive intermediates.

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Aminolevulinic acidFunctional recombinant TSPOHeminMembrane proteinPorphyrin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Translocator protein (TSPO) is a crucial membrane protein involved in various cellular functions.
  • Bacterial TSPO homologues offer unique opportunities to study TSPO structure-function relationships.

Purpose of the Study:

  • To characterize the recombinant Bacillus cereus TSPO (BcTSPO) and its ligand-binding properties.
  • To investigate the interaction of BcTSPO with heme biosynthesis intermediates and its response to light and oxygen.

Main Methods:

  • Overexpression of BcTSPO in E. coli, purification using SDS detergent.
  • Ligand binding studies with PK 11195, protoporphyrin IX (PPIX), and δ-aminolevulinic acid (ALA).
  • Nuclear Magnetic Resonance (NMR) spectroscopy (1H-15N HSQC titration) to identify binding interactions.
  • Photodegradation studies of PPIX bound to BcTSPO.

Main Results:

  • BcTSPO was successfully overexpressed and purified, retaining structural integrity and ligand-binding capacity.
  • NMR experiments revealed distinct amino acid residues involved in binding PK 11195, PPIX, and ALA.
  • PPIX binding to BcTSPO resulted in light- and oxygen-dependent fluorescence quenching.
  • Photoporphyrin products, formed via singlet oxygen addition to PPIX vinyl groups, were isolated and characterized.

Conclusions:

  • BcTSPO exhibits versatile ligand-binding capabilities, interacting with different molecules through specific cavity residues.
  • The photodegradation of PPIX suggests a potential role for BcTSPO as a scavenger of reactive oxygen species during heme biosynthesis.
  • These findings contribute to understanding TSPO's function in cellular processes and its potential involvement in regulating heme metabolism.