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Structure and function of cytidine monophosphate kinase from Yersinia pseudotuberculosis, essential for virulence but

Nicola J Walker1, Elizabeth A Clark, Donna C Ford

  • 1Biomedical Sciences, Defence Science and Technology Laboratory, Porton Down, Salisbury SP4 0JQ, UK.

Open Biology
|December 29, 2012
PubMed

Insights

Researchers identified cytidine monophosphate (CMP) kinase as a potential target for new antibiotics against plague. A mutant lacking CMP kinase showed reduced growth and was less virulent in mice, paving the way for new drug development.

Area of Science:

  • Microbiology
  • Biochemistry
  • Drug Discovery

Background:

  • The rise of antibiotic-resistant pathogens necessitates novel antimicrobial therapies.
  • Yersinia pestis, the plague bacterium, poses significant public health and biodefence risks.
  • Cytidine monophosphate (CMP) kinase was previously identified as a potential therapeutic target.

Purpose of the Study:

  • To investigate the essentiality of CMP kinase in Yersinia pestis.
  • To characterize a Yersinia pestis mutant lacking CMP kinase (Δcmk).
  • To determine the structural basis for CMP kinase activity.

Main Methods:

  • Genetic modification to create a Δcmk mutant.
  • Phenotypic characterization of the mutant, including growth assays and mouse infection models.
  • X-ray crystallography to determine CMP kinase structure.

Main Results:

  • A Yersinia pestis Δcmk mutant was successfully generated and characterized.
  • The mutant exhibited a significant growth defect and was highly attenuated in a mouse model.
  • The crystal structure of CMP kinase was elucidated to 2.32 Å, revealing key active site residues essential for enzyme function.

Conclusions:

  • CMP kinase is essential for Yersinia pestis virulence and survival.
  • The structural insights into CMP kinase provide a foundation for designing targeted inhibitors.
  • These findings support the development of novel antibiotics against plague by targeting CMP kinase.

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