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PUBLIC RELEASE DATE:
3-Feb-2009

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Contact: Christi Fish
christi.fish@utsa.edu
210-458-7584
University of Texas at San Antonio
@utsa

Researchers find pathway and enzyme unique to tularemia organism

UTSA team closer to discovering treatment for bio-warfare agent

San Antonio ... Researchers are closer to developing therapies to combat the deadly tularemia infection, according to a study published this week in the Proceedings of the National Academy of Sciences' online Early Edition. Karl Klose, director of the South Texas Center for Emerging Infectious Diseases (STCEID) at The University of Texas at San Antonio (UTSA), says his lab collaborated with researchers at the Burnham Institute for Medical Research, The University of Texas Southwestern Medical Center at Dallas and Thomas Jefferson University in a study that discovered that Francisella tularensis makes an essential metabolic molecule, nicotinamide adenine dinucleotide (NAD), using a different process and different enzyme from all other living organisms.

F. tularensis is a highly infectious organism that causes morbidity and mortality in humans. Very little is known about its molecular mechanisms of pathogenesis, and no vaccine is available for protection against tularemia, the disease it causes. Consequently, there is great concern about its role as a potential bioweapon.

However, the researchers' findings are promising. Because F. tularensis makes NAD using a unique pathway that is not used by humans, that pathway can be targeted to destroy the tularemia organism without doing damage to the human host.

"There is a 'conventional' way to make NAD, nicotinamide adenine dinucleotide, in all living organisms studied thus far, ranging from bacteria to humans," said Klose, whose lab studies the genetics behind the virulence of F. tularensis. "Our study uncovered that Francisella makes NAD in a very unique way, using the enzyme nicotinamide mononucleotide synthetase, or NMS. The findings offer us a possible target for the development of therapeutics against tularemia."

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To learn more about research at UTSA, please visit http://vpr.utsa.edu/.

The University of Texas at San Antonio is one of the fastest growing higher education institutions in Texas and the second largest of nine academic universities and six health institutions in the UT System. As a multicultural institution of access and excellence, UTSA aims to be a premier public research university providing access to educational excellence and preparing citizen leaders for the global environment.

UTSA serves more than 28,400 students in 64 bachelor's, 46 master's and 21 doctoral degree programs in the colleges of Architecture, Business, Education and Human Development, Engineering, Honors, Liberal and Fine Arts, Public Policy, Sciences and Graduate School. Founded in 1969, UTSA is an intellectual and creative resource center and a socioeconomic development catalyst for Texas and beyond.



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