Purification and characterization of formaldehyde dehydrogenase from rat liver cytosol

Seiji Tsuboi, Michi Kawase, Aya Takada, Mio Hiramatsu, Yumiko Wada, Yasuhiko Kawakami, Mikiko Ikeda, Shinji Ohmori

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13 Scopus citations

Abstract

Formaldehyde dehydrogenase was purified to electrophoretic and column chromatographic homogeneity from rat liver cytosolic fraction by a procedure which includes ammonium sulfate precipitation, DEAE-cellulose-, hydroxyapatite-, Mono Q-chromatography, and gel filtration. Its molecular mass was estimated to be 41 kDa by gel filtration and SDS-PAGE, suggesting that it is a monomer. It utilized neither methylglyoxal nor aldehydes except formaldehyde as a substrate. It has been reported that liver class in alcohol dehydrogenase and formaldehyde dehydrogenase are the same enzyme and oxidize formaldehyde and long chain primary alcohols. However, the enzyme examined here did not use n-octanoi as a substrate. The Km values for formaldehyde and NAD+ were 5.09 and 2.34 μM at 25°C, respectively. The amino acid sequences of 10 peptides obtained from the purified enzyme after digestion with either Vs protease or lysyl endopeptidase were determined. From these results, the enzyme was proved to be different from the previously described mammalian formaldehyde dehydrogenase and is the first true formaldehyde dehydrogenase to be isolated from a mammalian source.

Original languageEnglish (US)
Pages (from-to)465-471
Number of pages7
JournalJournal of Biochemistry
Volume111
Issue number4
DOIs
StatePublished - Apr 1992
Externally publishedYes

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