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Constitutive nature of the enzymes of citrate metabolism in Streptococcus lactis subsp. diacetylactis

Published online by Cambridge University Press:  01 June 2009

Timothy M. Cogan
Timothy M. Cogan
Affiliation:
The Agricultural Institute, Fermoy, Co. Cork, Irish Republic
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Summary

Four enzymes of citrate metabolism (viz. citrate lyase, acetolactate synthase, diacetyl reductase and acetoin reductase) were constitutively present in cells of several strains of Streptococcus lactis subsp. diacetylactis. In strain DRC1, which was studied in detail, diacetyl reductase and acetoin reductase were partly repressed and acetolactate synthase partly induced by growth on citrate. The stage of growth also affected the formation of each enzyme. The buffer species affected the activity of acetolactate synthase, diacetyl reductase and acetoin reductase.

Type
Original Articles
Information
Journal of Dairy Research , Volume 48 , Issue 3 , October 1981 , pp. 489 - 495
Copyright
Copyright © Proprietors of Journal of Dairy Research 1981

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