Snf 1 Activation Loop Phosphorylation Is Controlled by Availability of the Phosphorylated Threonine 210 to the PP 1 Phosphatase *

Eric M. Rubenstein, Rhonda R. McCartney, Chao Zhang, Kevan M. Shokat, Margaret K. Shirra, Karen M. Arndt, and Martin C. Schmidt From the Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, the Howard Hughes Medical Institute and Department of Molecular and Cellular Pharmacology, University of California, San Francisco, San Francisco, California 94143, and the Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260