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Preclinical effectiveness of TB drug target validated

Date:
December 5, 2011
Source:
SRI International
Summary:
Scientists evaluating new drug targets against tuberculosis recently validated the preclinical effectiveness of a target that could rapidly eliminate infections and potentially shorten treatment time. The new drug target is a protein called DNA gyrase B, found in bacteria that cause TB infections.

Model of inhibitor bound to gyrase B ATP-binding site.
Credit: Image courtesy of SRI International

In research at SRI International, scientists evaluating new drug targets against tuberculosis (TB) recently validated the preclinical effectiveness of a target that could rapidly eliminate infections and potentially shorten treatment time. The new drug target is a protein called DNA gyrase B, found in bacteria that cause TB infections.

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DNA gyrase is an enzyme consisting of two subunits: gyrase A and gyrase B. Although gyrase A is often the target of antibiotics, such as ciprofloxacin, there currently is no antibiotic on the market that targets gyrase B. In laboratory experiments, SRI researchers found that by targeting gyrase B, TB bacteria are killed whether they are replicating or dormant. Further studies will be conducted toward the development of a TB drug against gyrase B.

"One of the greatest needs in infectious disease treatment is a drug that allows a shorter length of treatment," said Peter Madrid, Ph.D., program director in the Center for Infectious Disease and Biodefense Research, SRI Biosciences Division. "Though our program is still in the preclinical phase of research, with a number of years of required testing ahead, our goal is to develop a drug that will improve the treatment process for TB patients."

TB patients currently undergo treatment for six months and take a combination of at least four different drugs. There are often challenges to treatment effectiveness because of the long treatment time, including low patient treatment compliance and high rates of drug resistance. Tuberculosis that is resistant to multiple drugs takes even longer to treat, usually 18 to 24 months.

Research results are presented in the November 2011 Journal of Antimicrobial Chemotherapy in a paper titled "Evaluation of Gyrase B as a Drug Target in Mycobacterium tuberculosis."

The project described was supported by Award Numbers R56AI090817 and U01AI082070 from the National Institute of Allergy And Infectious Diseases.


Story Source:

The above story is based on materials provided by SRI International. Note: Materials may be edited for content and length.


Journal Reference:

  1. S. Chopra, K. Matsuyama, T. Tran, J. P. Malerich, B. Wan, S. G. Franzblau, S. Lun, H. Guo, M. C. Maiga, W. R. Bishai, P. B. Madrid. Evaluation of gyrase B as a drug target in Mycobacterium tuberculosis. Journal of Antimicrobial Chemotherapy, 2011; DOI: 10.1093/jac/dkr449

Cite This Page:

SRI International. "Preclinical effectiveness of TB drug target validated." ScienceDaily. ScienceDaily, 5 December 2011. <www.sciencedaily.com/releases/2011/11/111129151544.htm>.
SRI International. (2011, December 5). Preclinical effectiveness of TB drug target validated. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2011/11/111129151544.htm
SRI International. "Preclinical effectiveness of TB drug target validated." ScienceDaily. www.sciencedaily.com/releases/2011/11/111129151544.htm (accessed November 23, 2014).

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