Induction of citrate lyase in Enterobacter cloacae grown under aerated conditions and its effect on citrate metabolism.

Journal of Bacteriology
R W O'Brien

Abstract

Growth of Enterobacter cloacae on K+ citrate under aerated conditions (no detectable oxygen tension in the medium even though it was aerated) was slower (mean generation time, 130 min) than under aerobic conditions (mean generation time, 72 min), but with a faster utilization of citrate, resulting in a molar growth yield of 10.6 g (dry weight) of cells per mol of citrate utilized versus 40 g (dry weight) of cells per mol of citrate utilized for aerobic growth. The rapid utilization of citrate under aerated conditions was apparently due to the induction of citrate lyase and was supported by the finding that cells excreted acetate and a small amount of oxalacetate under aerated conditions, but not under aerobic conditions when the cells were devoid of citrate lyase activity. The activity of oxalacetate decarboxylase in aerated cells was slightly lower than in aerobic cells, indicating that little of the oxalacetate produced by the citrate lyase was metabolized by the decarboxylase. Oxalacetate was probably metabolized by malate dehydrogenase, previously shown to be present in anaerobic and aerobic cells. Thus, about 70% of the citrate was cleaved by the citrate lyase, resulting in little or no production of energy for growth. The...Continue Reading

References

Sep 1, 1974·Journal of Bacteriology·R W O'Brien, J Geisler
Nov 1, 1971·Journal of General Microbiology·R W O'Brien, J G Morris
Mar 1, 1972·Archives of Biochemistry and Biophysics·L S Wilkerson, R G Eagon
May 1, 1969·Journal of Bacteriology·R W O'Brien, J R Stern
Aug 15, 1953·Nature·S DAGLEY, E A DAWES

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Citations

Aug 1, 1977·Applied and Environmental Microbiology·E G Ruby, K H Nealson
Jun 1, 1987·Applied and Environmental Microbiology·C Kanbe, K Uchida
Jan 1, 1981·Applied and Environmental Microbiology·T M CoganD Mellerick

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