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Desulfatibacillum alkenivorans sp. nov., a novel n-alkene-degrading, sulfate-reducing bacterium, and emended description of the genus Desulfatibacillum

Cristiana Cravo-Laureau^1,, Robert Matheron¹, Catherine Joulian², Jean-Luc Cayol² and Agnès Hirschler-Réa^1,

¹ Laboratoire de Microbiologie, IMEP CNRS UMR 6116, Faculté des Sciences et Techniques de Saint-Jérôme, case 452, 13397 Marseille cedex 20, France
² Laboratoire de Microbiologie IRD, UR 101, IFR-BAIM case 925, Universités de Provence et de la Méditerranée, 163 avenue de Luminy, 13288 Marseille cedex 9, France

Correspondence
Cristiana Cravo-Laureau
c.cravo-laureau{at}univ.u-3mrs.fr

An alkene-degrading, sulfate-reducing bacterium, strain PF2803^T, was isolated from oil-polluted sediments (Fos Harbour, France). The cells were found to be Gram-negative, non-sporulating, non-motile and to have a slightly curved rod shape. Optimum growth occurred at 1 % (w/v) NaCl, pH 6·8 and 28–30 °C. Strain PF2803^T oxidized alkenes (from C₈ to C₂₃). The G+C content of the genomic DNA was 57·8 mol% (HPLC). On the basis of 16S rRNA gene sequence analyses, strain PF2803^T belongs to the family ‘Desulfobacteraceae’ in the class ‘Deltaproteobacteria’, with Desulfatibacillum aliphaticivorans as its closest relative (99·6 % identity). Comparative sequence analyses of the dissimilatory sulfite reductase (dsrAB) gene supported the affiliation of strain PF2803^T to the genus Desulfatibacillum. DNA–DNA hybridization with its closest taxon demonstrated 48·4 % similarity. On the basis of the results of physiological and genetic analyses, strain PF2803^T is identified as a novel species of the genus Desulfatibacillum, for which the name Desulfatibacillum alkenivorans sp. nov. is proposed. The type strain is PF2803^T (=DSM 16219^T=ATCC BAA-924^T).

A phase-contrast micrograph of cells of strain PF2803^T is available as supplementary material in IJSEM Online.

Present address: Laboratoire de Microbiologie IRD, UR 101, IFR-BAIM case 925, Universités de Provence et de la Méditerranée, 163 avenue de Luminy, 13288 Marseille cedex 9, France.

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