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Plants on steroids: Key missing link discovered
Date:9/8/2009

ncodes over 400 receptor-like kinases and in rice there are nearly 1,000. We know the functions of about a dozen or so. The completely connected brassinosteroid pathway uses at least six proteins to pass the signal from the receptor all the way to the nuclear genes expressed. This will be a new paradigm for understanding the functional mechanism of other receptor-like kinases."

Understanding the molecular mechanism of brassinosteroid signaling could help researchers develop strategies and molecular tools for genetic engineering of plants with modified sensitivity to hormones, either produced by the plant or sprayed on crops during cultivation, resulting in higher yield or improved traits. "We perhaps could engineer plants with altered sensitivity in different portions of the plant," says Wang. "For example, we could manipulate the signal pathway to increase the biomass accumulation in organs such as fruits that are important as agricultural products, an area highly relevant for food and biofuel production."

Another of the study's findings has potentially far-reaching consequences for human health. The newly identified brassinosteroid signaling pathway component shares evolutionarily conserved domains with the glycogen synthase kinase 3 (GSK3). "GSK3 is found in a wide range of organisms, including mammals," says Wang. "Our study identified a distinct mechanism for regulating GSK3 activity, different from what had been identified in earlier work. GSK3 is known to be critical in the development of health issues such as neural degeneration, cancer, and diabetes, so our finding could open up new avenues for research to understand and treat these diseases."


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Contact: Zhi-Yong Wang
zywang@ciw.edu
650-325-1521 x205
Carnegie Institution
Source:Eurekalert

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