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Structure of a protein related to heart and nervous system health revealed
Date:11/16/2010

ANN ARBOR, Mich. -- University of Michigan researchers have solved the structure of a protein that is integral to processes responsible for maintaining a healthy heart and nervous system.

The protein structure in question is cystathionine beta-synthase, known as CBS. CBS uses vitamin B6 to make hydrogen sulfide (H2S), a gaseous signaling molecule that helps maintain a healthy heart and nervous system. H2S also induces a state of suspended animation or hibernation in animals by decreasing body temperature and lowering metabolic rate.

The work to decode the structure was led by Ruma Banerjee, Ph.D., a professor in the Department of Biological Chemistry at the U-M Medical Schoool, Janet Smith, Ph.D., a research professor at the U-M Life Sciences Institute, and their colleagues. Their findings are published today in the Proceedings of the National Academy of Sciences.

"The structure of full-length CBS, which has eluded the science community for more than a decade, provides a wealth of new information about gas generation by CBS, which is especially important in the brain," says Banerjee, the study's senior author and the Vincent Massey Collegiate Professor of Biological Chemistry and associate chair of biological chemistry . "It also provides a framework for understanding homocystinuria-causing mutations."

Mutations in the gene for CBS cause homocystinuria, an inherited disorder that affects the central nervous system, ocular, skeletal, and cardiovascular systems.

The structure of the full-length CBS, seen here for the first time, provides a molecular explanation for homocystinuria due to CBS defects.

The activity of CBS is increased by SAMe (S-adenosylmethionine), a dietary supplement that is used for its anti-depressant and anti-inflammatory activities. SAMe also increases production of H2S by binding to CBS.

"Molecular insights into the architecture of the CBS domain to which SAMe b
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Contact: Jennifer Farina
jrfarina@umich.edu
734-615-4862
University of Michigan Health System
Source:Eurekalert  

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