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1 Department of Biological Sciences, PO Box 8007, Idaho State University, Pocatello, ID 83209, USA
2 Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802, USA
Correspondence
Vanya I. Miteva
vim1{at}psu.edu
A novel, psychrophilic, Gram-positive bacterium (designated strain LV3T) from a lake near the McMurdo Ice Shelf, Antarctica, has been isolated and characterized. This organism formed red-pigmented colonies, had an optimal growth temperature of 18 °C and grew on a variety of media between -2 and 21 °C. Scanning electron micrographs of strain LV3T that showed small rods with unusual bulbous protuberances during all phases of growth were of particular interest. The G+C content of the genomic DNA was approximately 62 mol%. The cell walls contained ornithine as the diamino acid. The major fatty acids were anteiso-C15 : 0, iso-C16 : 0 and anteiso-C17 : 0. Cells grown at -2 °C contained significant amounts of anteiso-C15 : 1. The major menaquinones found in strain LV3T were MK-11 and MK-12. Phylogenetic analysis of the 16S rRNA gene sequence indicated that strain LV3T was a member of the family Microbacteriaceae and related to, but distinct from, organisms belonging to the genera Agreia, Leifsonia and Subtercola. In addition, alignments of 16S rRNA sequences showed that the sequence of strain LV3T contained a 13 bp insertion that was found in only a few related sequences. Based on the low growth temperature, unusual cell shape, distinct 16S rRNA gene sequence and structure and cell-wall amino acid and menaquinone compositions, Rhodoglobus vestalii gen. nov., sp. nov. is proposed, with the type strain LV3T (=ATCC BAA-534T =CIP 107482T).
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain LV3T is AJ459101.
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