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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The effect of proflavine on pyruvate kinase I of Escherichia coli B.

Proflavine (PF) inhibited glucose use in sensitive but not resistant Escherichia coli B. Glucose transport (as measured by alpha-methylglucoside accumulation) was only partly inhibited by PF concentration that completely blocked glucose use. Fructose 1,6-diphosphate-(FDP)-regulated pyruvate kinase ( PK1) (EC, the only glycolytic enzyme affected by PF, was completely inhibited by a dye concentration of 0.8 mM. The inhibition curve for PF was sigmoidal, suggesting that PF was acting as an allosteric inhibitor. PF increased the K 1/2 for phosphoenolpyruvate (PEP) and lowered the V; however, it had no effect on the Hill number for PEP. PF inhibition was partially reversed by FDP but not by cyclic AMP, AMP, ATP, fuctose 6-phosphate, or dithiothreitol. Studies with a variety of acridines indicated that those substituted at the 3-position are the most effective inhibitors and also that hydrophobic interactions may be involved in PF inhibition of PK I. PK I for E. coli B/Pr was also strongly inhibited by PF, indicating that PF resistance does not lie at the level of this enzyme. Ribose-5-phosphate-regulated pyruvate kinase (EC was much less sensitive that PK I to the inhibitory effects of PF. A role for PF as a molecular probe for PK I has been proposed.[1]


  1. The effect of proflavine on pyruvate kinase I of Escherichia coli B. McKellar, R.C., Kushner, D.J. Can. J. Biochem. (1977) [Pubmed]
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