Diacylglycerol kinase ζ: At the crossroads of lipid signaling and protein complex organization
2012
Rincón, Esther | Gharbi, Severine I. | Santos-Mendoza, Teresa | Mérida, Isabel
Diacylglycerol (DAG) and phosphatidic acid (PA) are lipids with unique functions as metabolic intermediates, basic membrane constituents, and second-signal components. Diacylglycerol kinases (DGK) regulate the levels of these two lipids, catalyzing the interconversion of one to the other. The DGK family of enzymes is composed of 10 isoforms, grouped into five subfamilies based on the presence of distinct regulatory domains. From its initial characterization as a type IV DGK to the generation of mouse models showing its importance in cardiac dysfunction and immune pathologies, diacylglycerol kinase ζ (DGKζ) has proved an excellent example of the critical role of lipid-metabolizing enzymes in the control of cell responses. Although the mechanism that regulates this enzyme is not well known, many studies demonstrate its subtle regulation and its strategic function in specific signaling and as part of adaptor protein complexes. These data suggest that DGKζ offers new opportunities for therapeutic manipulation of lipid metabolism.
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