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Appl. Environ. Microbiol., Aug 1997, 3218-3224, Vol 63, No. 8
IR McDonald and JC Murrell
The methanol dehydrogenase gene mxaF, encoding the large subunit of the
enzyme, was amplified from the DNA of a number of representative
methanotrophs, methyletrophs, and environmental samples by PCR using
primers designed from regions of conserved amino acid sequence identified
by comparison of three known sequences of the large subunit of methanol
dehydrogenase. The resulting 550-bp PCR products were cloned and sequenced.
Analysis of the predicted amino acid sequences corresponding to these mxaF
genes revealed strong sequence conservation. Of the 172 amino acid
residues, 47% were conserved among all 22 sequences obtained in this study.
Phylogenetic analysis of these MxaF sequences showed that those from type I
and type II methanotrophs form two distinct clusters and are separate from
MxaF sequences of other gram-negative methylotrophs. MxaF sequences
retrieved by PCR from DNA isolated from a blanket bog peat core sample
formed a distinct phylogenetic cluster within the MxaF sequences of type II
methanotrophs and may originate from a novel group of acidophilic
methanotrophs which have yet to be cultured from this environment.
Copyright © 1997, American Society for Microbiology
The methanol dehydrogenase structural gene mxaF and its use as a functional gene probe for methanotrophs and methylotrophs
Department of Biological Sciences, University of Warwick, United Kingdom.
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