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  • Title: Post-transcriptional control of L-1,2-propanediol oxidoreductase in the L-fucose pathway of Escherichia coli K-12.
    Author: Chen YM, Lin EC.
    Journal: J Bacteriol; 1984 Jan; 157(1):341-4. PubMed ID: 6418721.
    Abstract:
    During anaerobic growth on L-fucose, Escherichia coli excretes L-1,2-propanediol formed by an inducible NAD-linked oxidoreductase. The activity of this enzyme is highly induced by L-fucose only anaerobically. However, in strains bearing a hybrid operon with the promoter of fucO (the propanediol oxidoreductase gene) fused to lacZYA, the beta-galactosidase activity is inducible by fucose both anaerobically and aerobically. In merodiploids bearing both fucO+ and phi(fucO-lac), propanediol oxidoreductase is inducible only anaerobically, but beta-galactosidase remains inducible both aerobically and anaerobically. Thus, the absence of respiratory control in the expression of phi(fucO-lac) cannot be attributed to a polarity effect of the fusion on a gene encoding a protein with autogenous regulatory function in transcription. The respiratory effect on the induced propanediol oxidoreductase activity is therefore post-transcriptional.
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