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J Bacteriol. 1979 December; 140(3): 949-954

Pentitol metabolism in Lactobacillus casei.

ABSTRACT

Strains of Lactobacillus casei capable of growing on either ribitol or xylitol carry out a heterolactic fermentation producing ethanol, acetate, and a mixture of D- and L-lactate. Following conversion of the pentitols to ribulose 5-phosphate or xylulose 5-phosphate via enzymatic steps unique to these organisms, the intermediate products are further metabolized by enzymes of the pentose pathway. The initial enzymes of the pathway, i.e., pentitol:phosphoenolypyruvate phosphotransferase and penititol phosphate dehydrogenase, do not appear to be stringently regulated by glucose or intermediate products of glycolysis.

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