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Acetaldehyde: an intermediate in the formation of ethanol from glucose by lactic acid bacteria

Published online by Cambridge University Press:  01 June 2009

G. J. Lees
Affiliation:
Russell Grimwade School of Biochemistry, University of Melbourne, Parkville, Victoria 3052, Australia
G. R. Jago
Affiliation:
Dairy Research Laboratory, Division of Food Research, C.S.I.R.O., Highett, Victoria 3190, Australia

Summary

Group N streptococci formed acetaldehyde and ethanol from glucose. As the enzymes aldehyde dehydrogenase, phosphotransacetylase and acetate kinase were present this would enable these organisms to reduce acetyl-CoA to acetaldehyde and convert acetyl-CoA to acetyl phosphate and acetate. A pentose phosphate pathway which converted ribose-5-phosphate to glyceraldehyde-3-phosphate was also present. Acetaldehyde could not be formed via the hexose monophosphate shunt or by direct decarboxylation of pyruvate, as the enzymes phosphoketolase and α-carboxylase were absent. Phosphoketolase activity was induced in Streptococcus lactis subsp. diacetylactis after growth on D-xylose. Group N streptococci also contained an NAD-dependent alcohol dehydrogenase which reduced acetaldehyde to ethanol while both NAD- and NADP-dependent alcohol dehydrogenase activities were found in Leuconostoc cremoris.

Type
Research Article
Copyright
Copyright © Proprietors of Journal of Dairy Research 1976

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