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Ian R. McDonald Levente Bodrossy Yin Chen J. Colin Murrell 《Applied microbiology》2008,74(5):1305-1315
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Levente Bodrossy E. M. Holmes A. J. Holmes Kornél L. Kovács J. C. Murrell 《Archives of microbiology》1997,168(6):493-503
Two methanotrophic bacteria with optimum growth temperatures above 40° C were isolated. Thermotolerant strain LK6 was isolated
from agricultural soil, and the moderately thermophilic strain OR2 was isolated from the effluent of an underground hot spring.
When compared to the described thermophilic methanotrophs Methylococcus capsulatus and Methylococcus thermophilus, these strains are phenotypically similar to Methylococcus thermophilus. However, their 16S rRNA gene sequences are markedly different from the sequence of Methylococcus thermophilus (∼ 8% divergence) and, together with Methylomonas gracilis, they form a distinct, new genus within the γ-subgroup of the Proteobacteria related to extant Type I methanotrophs. Further
phenotypic characterisation showed that the isolates possess particulate methane monooxygenase (pMMO) but do not contain soluble
methane monooxygenase. The nucleotide sequence of a gene encoding pMMO (pmoA) was determined for both isolates and for Methylomonas gracilis. PmoA sequence comparisons confirmed the monophyletic nature of this newly recognised group of thermophilic methanotrophs
and their relationship to previously described Type I methanotrophs. We propose that strains OR2 and LK6, together with the
misclassified thermophilic strains Methylomonas gracilis VKM-14LT and Methylococcus thermophilus IMV-B3122, comprise a new genus of thermophilic methanotrophs, Methylocaldum gen. nov., containing three new species: Methylocaldum szegediense, Methylocaldum tepidum and Methylocaldum gracile.
Received: 2 April 1997 / Accepted: 23 July 1997 相似文献