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. 1993 Jun;175(12):3767–3775. doi: 10.1128/jb.175.12.3767-3775.1993

Methanol oxidation genes in the marine methanotroph Methylomonas sp. strain A4.

D Waechter-Brulla 1, A A DiSpirito 1, L V Chistoserdova 1, M E Lidstrom 1
PMCID: PMC204793  PMID: 7685335

Abstract

Methanol dehydrogenase has been purified from the type I marine methanotroph Methylomonas sp. strain A4 and found to be similar to other methanol dehydrogenase enzymes in subunit composition, molecular mass, and N-terminal sequence of the two subunits. A heterologous gene probe and a homologous oligonucleotide have been used to identify a DNA fragment from Methylomonas sp. strain A4 which contains moxF, the gene encoding the large subunit of methanol dehydrogenase. Protein expression experiments with Escherichia coli, immunoblotting of expression extracts, and partial DNA sequence determination have confirmed the presence of moxF on this DNA fragment. In addition, expression and immunoblot experiments have shown the presence of the genes for the small subunit of methanol dehydrogenase (moxI) and for the methanol dehydrogenase-specific cytochrome c (moxG). The moxG gene product has been shown to be cytochrome c552. The expression experiments have also shown that two other genes are present on this DNA fragment, and our evidence suggests that these are the homologs of moxJ and moxR, whose functions are unknown. Our data suggest that the order of these genes in Methylomonas sp. strain A4 is moxFJGIR, the same as in the facultative methylotrophs. The transcriptional start site for moxF was mapped. The sequence 5' to the transcriptional start does not resemble other promoter sequences, including the putative moxF promoter sequence of facultative methylotrophs. These results suggest that although the order of these genes and the N-terminal amino acid sequence of MoxF and MoxI are conserved between distantly related methylotrophs, the promoters for this gene cluster differ substantially.

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Selected References

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