Ilaria Micallo, Ashley V Bullington, Daniel L Kober, Noam Zelcer
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SPRINGing off the lock: the role of SPRING in S1P activity and SREBP-regulated lipid metabolism.
Purpose of review: Lipid metabolism and de-novo lipogenesis (DNL) is broadly controlled by the SREBP transcription factors. These transcription factors are matured from membrane-anchored precursor proteins by the proteolytic actions of the proteases S1P and S2P. In this review, we summarize the current understanding of SPRING, a recently identified activator of S1P.
Recent findings: Recent studies of SPRING using animal, cellular, biochemical, and biophysical methods have established SPRING as a core component of the SREBP machinery. Deletion of SPRING in cells and animal livers specifically reduces SREBP activity yet leaves other S1P substrates intact, demonstrating an SREBP-specific role for SPRING in licensing S1P activity. Mechanistic biochemical and structural studies revealed that SPRING activates S1P by competitively displacing its inhibitory pro-domain and elucidated how small molecule inhibition of S1P can be accomplished.
Summary: Current studies have shown how SPRING activates S1P and uncovered a critical role for SPRING in the SREBP pathway. Further studies are warranted to understand this emerging, connection between SPRING and the regulation of DNL through SREBP.
期刊介绍:
With its easy-to-digest reviews on important advances in world literature, Current Opinion in Lipidology offers expert evaluation on a wide range of topics from six key disciplines including nutrition and metabolism, genetics and molecular biology, and hyperlipidaemia and cardiovascular disease. Published bimonthly, each issue covers in detail the most pertinent advances in these fields from the previous year. This is supplemented by a section of Bimonthly Updates, which deliver an insight into new developments at the cutting edge of the disciplines covered in the journal.