Phosphorylation-mediated regulation of the Nem1-Spo7/Pah1 phosphatase cascade in yeast lipid synthesis. (May 2022)

• Record Type: Journal Article
• Authors: Khondker, Shoily; Han, Gil-Soo; Carman, George M.
• Is Part Of: Advances in biological regulation. Volume 84(2022)
• Publication Date: 2022-05
• Subjects: Phospholipid -- Phosphatidic acid -- Triacylglycerol -- Diacylglycerol -- Pah1 PA phosphatase -- Nem1-Spo7 protein phosphatase -- Protein kinase -- Yeast; Cellular control mechanisms -- Periodicals; Biological control systems -- Periodicals; Molecular biology -- Periodicals; Periodicals; 571.74
• DOI: 10.1016/j.jbior.2022.100889
• Languages: English
• ISSNs: 2212-4926

Abstract

Abstract: The PAH1 -encoded phosphatidate phosphatase, which catalyzes the dephosphorylation of phosphatidate to produce diacylglycerol, controls the divergence of phosphatidate into triacylglycerol synthesis and phospholipid synthesis. Pah1 is inactive in the cytosol as a phosphorylated form and becomes active on the nuclear/endoplasmic reticulum membrane as a dephosphorylated form by the Nem1-Spo7 protein phosphatase complex. The phosphorylation of Pah1 by protein kinases, which include casein kinases I and II, Pho85-Pho80, Cdc28-cyclin B, and protein kinases A and C, controls its cellular location, catalytic activity, and susceptibility to proteasomal degradation. Nem1 (catalytic subunit) and Spo7 (regulatory subunit), which form a protein phosphatase complex catalyzing the dephosphorylation of Pah1 for its activation, are phosphorylated by protein kinases A and C. In this review, we discuss the functions and interrelationships of the protein kinases in the control of the Nem1-Spo7/Pah1 phosphatase cascade and lipid synthesis.