function:Mediates feedback control of cholesterol synthesis by controlling SCAP and HMGCR. Functions by blocking the processing of sterol regulatory element-binding proteins (SREBPs). Capable of retaining the SCAP-SREBF2 complex in the ER thus preventing it from escorting SREBPs to the Golgi. Seems to regulate the ubiquitin-mediated proteasomal degradation of HMGCR.,miscellaneous:Does not require nuclear SREBPs for its expression. When nuclear SREBP activity is low, is the only form of INSIG present in the cell.,similarity:Belongs to the INSIG family.,subunit:Binds to the SCAP-SREBF2 complex only in the presence of sterols.,
Endoplasmic reticulum membrane ; Multi-pass membrane protein .
Brain,Hypothalamus,Pituitary,
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