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Methylobacterium variabile sp. nov., a methylotrophic bacterium isolated from an aquatic environment

Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain

Correspondence
Antonio Ventosa
ventosa{at}us.es

Strain GR3^T was isolated from drinking water during a screening programme to monitor the bacterial population present in the distribution system of Seville (Spain), and it was studied phenotypically, genotypically and phylogenetically. This pink-pigmented bacterium was identified as a Methylobacterium sp. Members of this genus are distributed in a wide variety of natural habitats, including soil, dust, air, freshwater and aquatic sediments. Phylogenetic analysis of the 16S rRNA gene sequence showed that strain GR3^T was closely related to Methylobacterium aquaticum (97·4 % sequence similarity), whereas sequence similarity values with respect to the rest of the species belonging to this genus were lower than 96 %. Furthermore, the DNA–DNA hybridization data and its phenotypic characteristics clearly indicate that the isolate represents a novel Methylobacterium species, for which the name Methylobacterium variabile sp. nov. is proposed. GR3^T (=DSM 16961^T=CCM 7281^T=CECT 7045^T) is the type strain; the DNA G+C content of this strain is 69·2 mol%.

Published online ahead of print on 28 January 2005 as DOI 10.1099/ijs.0.63597-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain GR3^T is AJ851087.

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