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Arthrobacter bergerei sp. nov. and Arthrobacter arilaitensis sp. nov., novel coryneform species isolated from the surfaces of cheeses

¹ Unité Mixte de Recherche Génie et Microbiologie des Procédés Alimentaires (UMR GMPA), Institut National de la Recherche Agronomique, 78850 Thiverval-Grignon, France
² Collection de l'Institut Pasteur, Institut Pasteur, 75724 Paris Cedex 15, France
³ Unité de Biodiversité des bactéries pathogènes émergentes, INSERM U389, Institut Pasteur, 75724 Paris Cedex 15, France

Correspondence
Françoise Irlinger
irlinger{at}grignon.inra.fr

Fourteen isolates of two different bacterial species isolated from the surface of smear-ripened cheeses were found to exhibit many characteristics of the genus Arthrobacter. The isolates were aerobic, Gram-positive, catalase-positive, non-spore-forming and non-motile. The cell-wall peptidoglycan contained lysine, alanine and glutamic acid. rrs sequence analysis indicated that the new isolates Re117^T and Ca106^T are closely related to the Arthrobacter nicotianae group and showed highest sequence similarity (>98 %) to Arthrobacter nicotianae and Arthrobacter protophormiae. However, DNA–DNA hybridization studies indicated that the strains represented two novel genomic species within the genus Arthrobacter and did not belong to A. nicotianae or A. protophormiae (<43 % DNA–DNA relatedness). On the basis of the phylogenetic and phenotypic distinctiveness of the new isolates, these bacteria should be classified as two novel Arthrobacter species, for which the names Arthrobacter bergerei sp. nov. and Arthrobacter arilaitensis sp. nov. are proposed. Type strains have been deposited in culture collections as Arthrobacter bergerei Ca106^T (=CIP 108036^T=DSM 16367^T) and Arthrobacter arilaitensis Re117^T (=CIP 108037^T=DSM 16368^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains Gor104, Ma107, Bres102, Cou102, Epo104, Po101, Po102, Re117^T, Stp101, Ca106^T, Ka101, La101 and Re127 are AJ609621–AJ609633, respectively.

A dendrogram based on ribotyping data, an extended 16S rRNA gene-based neighbour-joining tree and detailed DNA–DNA hybridization results are available as supplementary material in IJSEM Online.

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