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Targeting a waterborne foe
Date:4/25/2010

ANAHEIM, CA Discovered in 1976, cryptosporidium lurks worldwide in water, contaminating swimming pools, water parks, and drinking water supplies. Although it has even been featured on the comedy show The Colbert Report, it is no laughing matterthis microscopic pathogen is a leading cause of diarrhea and malnutrition and the most common source of infection in immune-weakened people such as AIDS patients. It is also a potential bioterrorism agent.

"All you need is a cow and a centrifuge to harvest enough oocysts to infect a small city," says Brandeis University biochemist Liz Hedstrom. Roughly 20 percent of calves are infected by cryptosporidium oocysts, which are found in their feces. In 1993, in the largest waterborne disease outbreak in U.S. history, this nasty protozoan parasite infiltrated Milwaukee's municipal water supply, killing more than 100 people and sickening some 400,000.

Cryptosporidium invades the small intestine, where it opens fire, typically causing severe gastrointestinal distress and even death in people with weakened immune systems. Cryptosporidium is a hardy foe whose oocystsa spore-like phase in the parasite life cycleremain stable outside a host for long periods and are resistant to conventional water treatment such as chlorine disinfection.

The latest research news on this waterborne foe will be the focus of Hedstrom's talk, titled "Targeting a prokaryotic protein in a eukaryotic parasite," at the American Society for Biochemistry and Molecular Biology's annual meeting. The talk will be held in the Anaheim Convention Center, Room 304C, on Sunday April 25 at 9:55 am PST. Hedstrom's promising research could lead to an effective treatment to prevent cryptosporidiosis.

Hedstrom and her collaborators made a critical breakthrough in eroding cryptosporidium defenses when they identified IMPDH, a key enzyme involved in the biosynthesis of RNA and DNA, as a potential drug target. Her research has shown tha
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Contact: Nicole Kresge
nkresge@asbmb.org
202-316-5447
Federation of American Societies for Experimental Biology
Source:Eurekalert

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