title: Gene sequence phylogenies of the family microbacteriaceae.
abstract: The type strains of 32 species of 13 genera of the family Microbacteriaceae were analysed with respect to gene-coding phylogeny for DNA gyrase subunit B (gyrB), RNA-polymerase subunit B (rpoB), recombinase A (recA), and polyphosphate kinase (ppk). The resulting gene trees were compared with the 16S rRNA gene phylogeny of the same strains. The topology of neighbour-joining and maximum parsimony phylogenetic trees, based on nucleic-acid sequences and protein sequences of housekeeping genes, differed from one another, and no gene tree was identical to that of the 16S rRNA gene tree. Most genera analysed containing >1 strain formed phylogenetically coherent taxa. The three pathovars of Curtobacterium flaccumfaciens clustered together to the exclusion of the type strains of other Curtobacterium species in all DNA - and protein-based analyses. In no tree did the distribution of a major taxonomic marker, i.e., diaminobutyric acid versus lysine and/or ornithine in the peptidoglycan, or acyl type of peptidoglycan, correlate with the phylogenetic position of the organisms. The changing phylogenetic position of Agrococcus jenensis was unexpected: This strain defined individual lineages in the trees based on 16S rRNA and gyrB and showed identity with Microbacterium saperdae in the other three gene trees.
authors.affiliation: Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstrasse 7B, 38124, Braunschweig, Germany. erko@dsmz.de
authors.forename: Erko
authors.initials: E
authors.lastname: Stackebrandt
authors.forename: Evelyne
authors.initials: E
authors.lastname: Brambilla
authors.forename: Kathrin
authors.initials: K
authors.lastname: Richert
mesh_terms: D000192:Actinomycetales / Q000145:classification* / Q000235:genetics*; D016000:Cluster Analysis; D027081:DNA Gyrase / Q000235:genetics; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D012321:DNA-Directed RNA Polymerases / Q000235:genetics; D008969:Molecular Sequence Data; D010457:Peptidoglycan / Q000737:chemistry; D017856:Phosphotransferases (Phosphate Group Acceptor) / Q000235:genetics; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D011938:Rec A Recombinases / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D010457:Peptidoglycan; D012336:RNA, Ribosomal, 16S; D017856:Phosphotransferases (Phosphate Group Acceptor); C022424:polyphosphate kinase; D011938:Rec A Recombinases; D012321:DNA-Directed RNA Polymerases; C105078:RNA polymerase beta subunit; D027081:DNA Gyrase