title: Characterization of Actinomyces isolates from infected root canals of teeth: description of Actinomyces radicidentis sp. nov.
abstract: Two strains of a previously undescribed Actinomyces-like bacterium were recovered in pure culture from infected root canals of teeth. Analysis by biochemical testing and polyacrylamide gel electrophoresis of whole-cell proteins indicated that the strains closely resembled each other phenotypically but were distinct from previously described Actinomyces and Arcanobacterium species. Comparative 16S rRNA gene-sequencing studies showed the bacterium to be a hitherto unknown subline within a group of Actinomyces species which includes Actinomyces bovis, the type species of the genus. Based on phylogenetic and phenotypic evidence, we propose that the unknown bacterium isolated from human clinical specimens be classified as Actinomyces radicidentis sp. nov. The type strain of Actinomyces radicidentis is CCUG 36733.
authors.affiliation: Department of Food Science and Technology, University of Reading, Reading RG6 6AP, United Kingdom. m.d.collins@reading.ac.uk
authors.forename: M D
authors.initials: MD
authors.lastname: Collins
authors.forename: L
authors.initials: L
authors.lastname: Hoyles
authors.forename: S
authors.initials: S
authors.lastname: Kalfas
authors.forename: G
authors.initials: G
authors.lastname: Sundquist
authors.forename: T
authors.initials: T
authors.lastname: Monsen
authors.forename: N
authors.initials: N
authors.lastname: Nikolaitchouk
authors.forename: E
authors.initials: E
authors.lastname: Falsen
mesh_terms: D000190:Actinomyces / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D000196:Actinomycosis / Q000382:microbiology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003786:Dental Pulp Cavity / Q000382:microbiology*; D005260:Female; D005798:Genes, Bacterial; D020459:Genes, rRNA; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D012336:RNA, Ribosomal, 16S