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Reassessment of the Phylogenetic Position of Caulobacter subvibrioides

L. I. SLY^1,*, MARIAN M. CAHILL¹, K. MAJEED and G. JONES²

¹ Australian Collection of Microorganisms, Centre for Bacterial Diversity and Identification, Department of Microbiology The University of Queensland, Brisbane, Australia
² CSIRO Division of Water Resources, Griffith, New South Wales, Australia

^* Corresponding author. Phone: 61 7 3365 2396. Fax: 61 7 3365 1566. E-mail: sly{at}biosci.uq.oz.au.

ABSTRACT

Determination of the 16S rRNA gene sequence of Caulobacter subvibrioides ATCC 15264^T (T = type strain) confirmed that this species is a member of the alpha subclass of the Proteobacteria and showed that it is phylogenetically most closely related to the Caulobacter group comprising the species Caulobacter bacteroides, Caulobacter crescentus, and Brevundimonas (Pseudomonas) diminuta, for which 16S rRNA sequences of the type strains are currently available. The closest known relative of strain ATCC 15264^T among these species is B. diminuta (level of direct pairwise sequence similarity, 95%). On the basis of its previously determined 16S rRNA sequence (accession number M83797), C. subvibrioides is most closely related to Sphingomonas adhaesiva in the alpha-4 subgroup (level of similarity, 97.7%). Analysis of the hydroxy fatty acids of C. subvibrioides ATCC 15264^T showed that the 2-hydroxymyristic acid which is characteristic of the genus Sphingomonas was absent.