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Insig-2, a second endoplasmic reticulum protein that binds SCAP and blocks export of sterol regulatory element-binding proteins

Insig-2, a second endoplasmic reticulum protein that binds SCAP and blocks export of sterol regulatory element-binding proteins

Proceedings of the National Academy of Sciences of the United States of America 99(20): 12753-8

This paper describes insig-2, a second protein of the endoplasmic reticulum that blocks the processing of sterol regulatory element-binding proteins (SREBPs) by binding to SCAP (SREBP cleavage-activating protein) in a sterol-regulated fashion, thus preventing it from escorting SREBPs to the Golgi. By blocking this movement, insig-2, like the previously described insig-1, prevents the proteolytic processing of SREBPs by Golgi enzymes, thereby blocking cholesterol synthesis. The sequences of human insig-1 and -2 are 59% identical. Both proteins are predicted to contain six transmembrane helices. The proteins differ functionally in two respects: (i) production of insig-1, but not insig-2, in cultured mammalian cells requires nuclear SREBPs; and (ii) at high levels of expression, insig-1, but not insig-2, can block SCAP movement in the absence of exogenous sterols. The combined actions of insig-1 and -2 permit feedback regulation of cholesterol synthesis over a wide range of sterol concentrations.

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Accession: 010856054

Download citation: RISBibTeXText

PMID: 12242332

DOI: 10.1073/pnas.162488899

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