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Glycolytic Enzymes Coalesce in G bodies Under Hypoxic Stress #MMPMID28746874
Jin M; Fuller GG; Han T; Yao Y; Alessi AF; Freeberg MA; Roach N; Moresco JJ; Karnovsky A; Baba M; Yates JR; Gitler AD; Inoki K; Klionsky DJ; Kim JK
Cell Rep 2017[Jul]; 20 (4): 895-908 PMID28746874show ga
Glycolysis is upregulated under conditions such as hypoxia and high energy demand to promote cell proliferation, although the mechanism remains poorly understood. We find that hypoxia in Saccharomyces cerevisiae induces concentration of glycolytic enzymes, including the Pfk2p subunit of the rate-limiting phosphofructokinase, into a single, non-membrane-bound granule termed the ?glycolytic body? or ?G body?. A yeast kinome screen identifies the yeast ortholog of AMP-activated protein kinase, Snf1p, as necessary for G body formation. Many G body components identified by proteomics are required for G body integrity. Cells incapable of forming G bodies in hypoxia display abnormal cell division and produce inviable daughter cells. Conversely, cells with G bodies show increased glucose consumption and decreased levels of glycolytic intermediates. Importantly, G bodies form in human hepatocarcinoma cells in hypoxia. Together, our results suggest that G body formation is a conserved, adaptive response to increase glycolytic output during hypoxia or tumorigenesis.