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Tuberculostearic Acid Controls Mycobacterial Membrane Compartmentalization.

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Researchers identified Cfa as the enzyme responsible for synthesizing tuberculostearic acid (TBSA), a key mycobacterial membrane lipid. This finding explains TBSA

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Mycobacterial plasma membranes exhibit lateral compartmentalization, forming intracellular membrane domains (IMDs).
  • Tuberculostearic acid (TBSA), a genus-specific branched-chain fatty acid, is abundant in mycobacteria but its biosynthesis and function were unclear.
  • Understanding membrane organization is crucial for mycobacterial survival and pathogenesis.

Purpose of the Study:

  • To identify the enzymes controlling membrane compartmentalization in mycobacteria.
  • To elucidate the role of TBSA in mycobacterial membrane structure and function.
  • To characterize the function of the Cfa enzyme in TBSA biosynthesis.

Main Methods:

  • Genome-wide transposon sequencing screen in *Mycobacterium smegmatis*.
  • Enzymatic assays to determine Cfa methyltransferase activity.
  • Lipidomic analysis of wild-type and *cfa* deletion mutant strains.
  • Analysis of membrane domain recovery after dibucaine treatment.

Main Results:

  • The gene *cfa* was identified as critical for membrane recovery after disruption.
  • Cfa was confirmed as an essential methyltransferase for TBSA synthesis, using oleic acid as a substrate.
  • A *cfa* deletion mutant showed accumulation of oleic acid and delayed IMD restoration.
  • TBSA biosynthesis directly contributes to lateral membrane partitioning in mycobacteria.

Conclusions:

  • Cfa is the long-sought enzyme catalyzing the first step of TBSA biosynthesis.
  • TBSA plays a significant role in regulating lateral membrane heterogeneity in mycobacteria.
  • Branched fatty acids are crucial for plasma membrane function, impacting pathogen survival.