PtdIns4P is a key regulator of the secretory pathway and plays an essential role in trafficking from the Golgi. Our recent work demonstrated that spatial control of PtdIns4P at the ER (endoplasmic reticulum) and Golgi co-ordinates secretion with cell growth. The central elements of this regulation are specific phosphoinositide 4-kinases and the phosphoinositide phosphatase Sac1. Growth-dependent translocation of Sac1 between the ER and Golgi modulates the levels of PtdIns4P and anterograde traffic at the Golgi. In yeast, this mechanism is largely dependent on the availability of glucose, but our recent results in mammalian cells suggest that Sac1 phosphatases play evolutionarily conserved roles in the growth control of secretion. Sac1 lipid phosphatase plays also an essential role in the spatial control of PtdIns4P at the Golgi complex. A restricted pool of PtdIns4P at the TGN (trans-Golgi network) is required for Golgi integrity and for proper lipid and protein sorting. In mammalian cells, the stress-activated MAPK (mitogen-activated protein kinase) p38 appears to play a critical role in transmitting nutrient signals to the phosphoinositide signalling machinery at the ER and Golgi. These results suggest that temporal and spatial integration of metabolic and lipid signalling networks at the Golgi is required for controlling the secretory pathway.
Conference Article| January 19 2012
Growth and metabolic control of lipid signalling at the Golgi
Peter Mayinger 1
1Division of Nephrology and Hypertension, and Department of Cell and Developmental Biology, Oregon Health and Science University, 3181 Sam Jackson Park Road, Portland, OR 97239, U.S.A.
1To whom correspondence should be addressed (email email@example.com).
Search for other works by this author on:
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
Hailan Piao, Peter Mayinger; Growth and metabolic control of lipid signalling at the Golgi. Biochem Soc Trans 1 February 2012; 40 (1): 205–209. doi: https://doi.org/10.1042/BST20110637
Download citation file: