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J Bacteriol. 1971 June; 106(3): 915-919
Copyright © 1971 American Society for Microbiology. All Rights Reserved.

Production of Phenotypically Epimeraseless Yeast by L-Arabinose¹

^a Department of Biochemistry and Molecular and Cellular Biology Program, Division of Biological Sciences, State University of New York, Stony Brook, New York 11790

ABSTRACT

The previous report from this laboratory that L-arabinose is a gratuitous inducer of the galactose transport system has been found to be an artefact resulting from the combination of galactose contamination of commercial samples of L-arabinose and inhibition by L-arabinose of galactose metabolism by inactivation of uridine-diphosphate-glucose-4-epimerase. As a result of L-arabinose inhibition of the metabolism of the contaminating galactose, galactose itself serves as a gratuitous inducer, producing phenotypically epimeraseless yeast.

² Present address: Scripps Oceanographic Institute, La Jolla, Calif.

³ Present address: Microbiology Institute, Rutgers University, New Brunswick, N.J.

¹ A preliminary report was presented at the 69th meeting of the American Society for Microbiology in Miami Beach, Fla. (Azam, Rosen, and Cirillo, Bacteriol. Proc., p. 165, 145, 1969).