Sterol-binding protein located at plasma membrane-ER contact sites; role in retrograde transport of sterols from plasma membrane to ER, which is inhibited via phosphorylation by TORC2-dependent protein kinase Ypk1p; contains two StART-like domains that bind sterols and a GRAM domain; co-localizes to puncta in the cortical ER with Sip3p; one of six StART-like domain-containing proteins in yeast that may be involved in sterol transfer between intracellular membranes; conserved across eukaryotes