Inhibitor of streptokinase gene expression improves survival after group A streptococcus infection in mice

Hongmin Sun, Yuanxi Xu, Izabela Sitkiewicz, Yibao Ma, Xixi Wang, Bryan D. Yestrepsky, Yuping Huang, Martian C. Lapadatescu, Martha J. Larsen, Scott D. Larsen, James M. Musser, David Ginsburg

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


The widespread occurrence of antibiotic resistance among human pathogens is a major public health problem. Conventional antibiotics typically target bacterial killing or growth inhibition, resulting in strong selection for the development of antibiotic resistance. Alternative therapeutic approaches targeting microbial pathogenicity without inhibiting growth might minimize selection for resistant organisms. Compounds inhibiting gene expression of streptokinase (SK), a critical group A streptococcal (GAS) virulence factor, were identified through a high-throughput, growth-based screen on a library of 55,000 small molecules. The lead compound [Center for Chemical Genomics 2979 (CCG-2979)] and an analog (CCG-102487) were confirmed to also inhibit the production of active SK protein. Microarray analysis of GAS grown in the presence of CCG-102487 showed down-regulation of a number of important virulence factors in addition to SK, suggesting disruption of a general virulence gene regulatory network. CCG-2979 and CCG- 102487 both enhanced granulocyte phagocytosis and killing of GAS in an in vitro assay, and CCG-2979 also protected mice from GAS-induced mortality in vivo. These data suggest that the class of compounds represented by CCG-2979 may be of therapeutic value for the treatment of GAS and potentially other Gram-positive infections in humans.

Original languageEnglish (US)
Pages (from-to)3469-3474
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number9
StatePublished - Feb 28 2012


  • Fibrinolysis
  • Plasminogen
  • Streptococcus pyogenes

ASJC Scopus subject areas

  • General


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