A critical role of mevalonate for peptidoglycan synthesis in Staphylococcus aureus

Area of Science:

• Microbiology
• Biochemistry
• Molecular Biology

Background:

• 3-hydroxy-3-methyl-glutaryl-CoA (HMG-CoA) reductase, a mevalonate synthetase, is crucial for Staphylococcus aureus growth.
• The precise function of HMG-CoA reductase in bacterial cell proliferation remained largely undefined.

Purpose of the Study:

• To elucidate the essential role of HMG-CoA reductase in Staphylococcus aureus cell growth.
• To investigate the relationship between HMG-CoA reductase activity, mevalonate production, and peptidoglycan synthesis.

Main Methods:

• Genetic analysis of mvaA gene mutants exhibiting temperature-sensitive phenotypes.
• Biochemical assays to measure HMG-CoA reductase activity in wild-type and mutant strains.
• Assessment of peptidoglycan synthesis rates under varying conditions and supplementations.

Main Results:

• Mutations in the mvaA gene resulted in temperature-sensitive growth defects in S. aureus.
• Supplementation with mevalonate or farnesyl diphosphate rescued the temperature-sensitive phenotype.
• Reduced HMG-CoA reductase activity correlated with decreased peptidoglycan synthesis in mvaA mutants.

Conclusions:

• Mevalonate, synthesized by HMG-CoA reductase, is indispensable for peptidoglycan synthesis in S. aureus.
• This pathway is critical for maintaining cell wall integrity and bacterial growth.
• Targeting HMG-CoA reductase could be a potential strategy for antimicrobial development against S. aureus.