Validation of CoaBC as a Bactericidal Target in the Coenzyme A Pathway of Mycobacterium tuberculosis

ACS Infect Dis. 2016 Dec 9;2(12):958-968. doi: 10.1021/acsinfecdis.6b00150. Epub 2016 Oct 5.


Mycobacterium tuberculosis relies on its own ability to biosynthesize coenzyme A to meet the needs of the myriad enzymatic reactions that depend on this cofactor for activity. As such, the essential pantothenate and coenzyme A biosynthesis pathways have attracted attention as targets for tuberculosis drug development. To identify the optimal step for coenzyme A pathway disruption in M. tuberculosis, we constructed and characterized a panel of conditional knockdown mutants in coenzyme A pathway genes. Here, we report that silencing of coaBC was bactericidal in vitro, whereas silencing of panB, panC, or coaE was bacteriostatic over the same time course. Silencing of coaBC was likewise bactericidal in vivo, whether initiated at infection or during either the acute or chronic stages of infection, confirming that CoaBC is required for M. tuberculosis to grow and persist in mice and arguing against significant CoaBC bypass via transport and assimilation of host-derived pantetheine in this animal model. These results provide convincing genetic validation of CoaBC as a new bactericidal drug target.

Keywords: CoA; CoaBC; drug discovery; pantetheine; tuberculosis.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Intramural

MeSH terms

  • Animals
  • Antitubercular Agents / chemistry
  • Bacterial Proteins / antagonists & inhibitors*
  • Bacterial Proteins / genetics
  • Bacterial Proteins / metabolism
  • Coenzyme A / metabolism*
  • Enzyme Inhibitors / administration & dosage*
  • Enzyme Inhibitors / chemistry
  • Female
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Mycobacterium tuberculosis / drug effects*
  • Mycobacterium tuberculosis / enzymology
  • Mycobacterium tuberculosis / genetics
  • Peptide Synthases / antagonists & inhibitors*
  • Peptide Synthases / genetics
  • Peptide Synthases / metabolism
  • Tuberculosis / drug therapy
  • Tuberculosis / microbiology*


  • Antitubercular Agents
  • Bacterial Proteins
  • Enzyme Inhibitors
  • Peptide Synthases
  • Coenzyme A