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Journal Article
Research Support, Non-U.S. Gov't
Utilization of exogenous glycerophosphodiesters and glycerol 3-phosphate by inositol-starved yeast, Saccharomyces uvarum.
Biochimica et Biophysica Acta 1985 July 10
Inositol-starved Saccharomyces uvarum cells hydrolyse exogenous glycerophosphodiesters to glycerol 3-phosphate and the corresponding alcohol. Glycerophosphodiesterase activity is highest with glycerophosphoinositol as the substrate, followed by glycerophosphoethanolamine and glycerophosphocholine; the artificial substrate for phosphodiesterases, bis-p-nitrophenylphosphate,is hydrolysed at a similar rate as compared with glycerophosphoinositol. Competition experiments suggest that distinct phosphodiesterases are involved in the hydrolysis of the respective substrates. An Mg2+-dependent glycerophosphate phosphohydrolase with a pH-optimum around neutral cleaves glycerol 3-phosphate to glycerol and orthophosphate. The latter is taken up into cells without first entering the pool of orthophosphate present in the growth medium. Accessibility to substrates with whole cells, adhesion of enzymes to spheroplasts, and solubilization of enzymes by treatment of whole cells with Triton X-100 under mild conditions suggest that phosphodiesterases and glycerol-3-phosphate phosphohydrolase are loosely associated with the outer side of the yeast plasma membrane. Enzyme activities are only marginal in inositol-supplemented cells, but are derepressed not only by inositol deficiency, but also by starvation of orthophosphate.
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