Abstract
Membrane fractions were isolated from dark grown cotyledons of Phaseolus auneus by differential and sucrose density gradient centrifugation. Endoplasmic reticulum-, Golgi apparatus- and plasma membrane-rich fractions were identified by their respective enzymic activities and tested for their ability to transfer glucose from UDP-glucose to endogenous sterols to form steryl glucosides. The glucosyltransferase activity was shown to be located mainly at the plasma membrane.
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