The DNAs of a variety of obligate methanotrophic bacteria were analyzed for base composition and nucleotide distribution. Genome molecular weights were determined for representative strains. Similarity maps attained by plotting DNA base composition versus nucleotide distribution and genome molecular weight showed that related species formed distinct clusters. Group I methanotrophs were found to form three clusters in both nucleotide distribution and genome size analyses. The first cluster consisted of five species, ,” and “.” The other clusters included both species and spcies, indicating the heterogeneity within these genera. One cluster contained low-G+C-content strains and included , and “.” The type strains of and “” and a marine methanotrophic strain also clustered with the low-G+C-content group rather than with the genus . “” also appeared to be genetically distinct from the true species and clustered with the high-G+C-content strains. This cluster included , and other moderately thermophilic group I methanotrophic strains. The group II methanotrophs belonging to the genera “” and “” formed separate generic clusters according to genome molecular weight data but not according to nucleotide distribution data.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error