PMID: 8612637Mar 1, 1996Paper

A 13C-NMR study of the mechanism of bacterial metabolism of monomethyl sulfate

European Journal of Biochemistry
T P HigginsG F White

Abstract

Two different mechanisms have been proposed previously for initiating the biodegradation of monomethyl sulfate (MeSO4) in bacteria. For a Hyphomicrobium species, a sulfatase enzyme has been proposed to hydrolyse MeSO4 to methanol and inorganic sulfate. For an Agrobacterium sp., an alternative proposal involves monooxygenation of MeSO4 (hydroxylation) to produce methanediol monosulfate, which decomposes spontaneously to formaldehyde and inorganic sulfate. In the present study, 13C-NMR was used to monitor metabolic intermediates of [13C]MeSO4 in real time in each species in order to resolve the issue of mechanism of biodegradation. Agrobacterium sp. M3C grew on MeSO4 but not on methanol. MeSO4-grown cells catabolised [13C]MeSO4 but not [13C]methanol, and [13C]methanol did not accumulate from MeSO4 in the presence of a known inhibitor of methanol dehydrogenase (cyclopropanol). Hyphomicrobium MS223 grew on MeSO4 and, in contrast with the Agrobacterium sp., also on methanol. The normally rapid metabolism of [13C]methanol by methanol-grown cells was arrested by cyclopropanol, but metabolism of [13C]MeSO4 by MeSO4-grown cells was unaffected. Moreover there was no accumulation of [13C]methanol from [13C]MeSO4 under conditions in which ...Continue Reading

Citations

Apr 27, 2000·Journal of Bacteriology·A KahnertM A Kertesz

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