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Appl. Environ. Microbiol., 11 1996, 4210-4215, Vol 62, No. 11
Copyright © 1996, American Society for Microbiology

Molecular identification of bacteria from a coculture by denaturing gradient gel electrophoresis of 16S ribosomal DNA fragments as a tool for isolation in pure cultures

A Teske, P Sigalevich, Y Cohen and G Muyzer
Molecular Ecology Group, Max Planck Institute for Marine Microbiology, Bremen, Germany.

Molecular information about the bacterial composition of a coculture capable of sulfate reduction after exposure to oxic and microoxic conditions was used to identify and subsequently to isolate the components of the mixture in pure culture. PCR amplification of 16S ribosomal DNA fragments from the coculture, analyzed by denaturing gradient gel electrophoresis, resulted in two distinct 16S ribosomal DNA bands, indicating two different bacterial components. Sequencing showed that the bands were derived from a Desulfovibrio strain and an Arcobacter strain. Since the phylogenetic positions of bacteria are often consistent with their physiological properties and culture requirements, molecular identification of the two components of this coculture allowed the design of specific culture conditions to separate and isolate both strains in pure culture. This approach facilitates the combined molecular and physiological analysis of mixed cultures and microbial communities.


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