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Identification and functional characterization of a gene for the methanol:N,N'-dimethyl-4-nitrosoaniline oxidoreductase from Mycobacterium sp. strain JC1 DSM 3803

¹ Yonsei University;
² Konkuk University

Mycobacterium sp. strain JC1 is able to grow on methanol as a sole source of carbon and energy using methanol:N,N'-dimethyl-4-nitrosoaniline oxidoreductase (MDO) as a key enzyme for primary methanol oxidation. Purified MDO oxidizes ethanol and formaldehyde as well as methanol. The Mycobacterium sp. strain JC1 gene for MDO (mdo) was cloned, sequenced, and determined to have an open reading frame of 1272 bp. Northern blot and promoter analysis revealed that the mdo transcription was induced in cells grown in the presence of methanol. Northern blot together with RT-PCR also showed that the mdo gene was transcribed as monocistronic mRNA. Primer extension analysis revealed that the transcriptional start site of mdo gene is located 21 bp upstream of the mdo start codon. An mdo-deficient mutant of Mycobacterium sp. strain JC1 did not grow with methanol as a sole source of carbon and energy.

³ E-mail: young547{at}yonsei.ac.kr