However, the C- and N- terminal regions were conserved. Except for a region on the flagellum surface, structural predictions of type I and II flagellins revealed that Regorafenib the two flagellin types were strongly correlated with each other. Phylogenetic analysis of the 115-amino acid N-terminal sequences revealed that the Actinoplanes species formed three clusters, and type II flagellin gene containing three type strains were phylogenetically closely related each other. The genus Actinoplanes (Couch, 1950; Stackebrandt & Kroppenstedt, 1987) is a member

of the family Micromonosporaceae (Krasil’nikov, 1938; Zhi et al., 2009), and is characterized by the presence of spherical, subspherical, cylindrical or very irregular sporangia (Lechevalier et al., 1966). The motile sporangiospores move by means of polar or peritrichous flagella (Couch, 1950). The flagellated spores exhibit chemotactic properties and are attracted to a variety of substrates, including those that contain bromide or chloride ions (Palleroni, 1976), fungal conidia, chlamydospores, sclerotia, or exudates of these (Arora, 1986), γ-collidine, d-Xylose, and pollen (Hayakawa et al., 1991a, b). Phylogenetic analyses based on the 16S rRNA gene sequences of members of the family Micromonosporaceae revealed that motile genera, such

as the Actinoplanes, do CAL-101 order not form coherent clusters or linaeages (Inahashi et al., 2010). Similarly, other motile actinomycetes were phylogenetically distributed among at least 20 families in the order Actinomycetales. Indeed, these findings indicate that the relationship between phylogeny and the propagation of the gene(s) encoding the flagellar system in prokaryotic organisms, including actinomycetes, is unclear. Bacterial flagella are considered to be composed of three parts: a basal body, a hook, and a filament (Macnab, 1992). The filament is composed of the flagellin protein,

which enough is synthesized internally and transported through the cell membrane to an external site for flagellum assembly (Snyder et al., 2009). The flagellin-encoding gene, fliC, has been used previously as a biomarker in studies of the taxonomy, epidemiology, and virulence of Burkholderia cepacia, Borrelia spp., and Clostridium difficile (Fukunaga & Koreki, 1996; Hales et al., 1998; Tasteyre et al., 2000). However, few studies have been conducted to date on the flagellar protein (Vesselinova & Ensign, 1996; Uchida et al., 2011) of motile actinomycetes. Vesselinova & Ensign (1996) reported that flagellins show two different sizes (32–43 and 42–43 kDa) in Actinoplanes spp. Recent advances in whole genome sequence analysis have facilitated examinations of bacterial flagellar diversity. Snyder et al. (2009) reported the distribution of flagellar genes and the predicted nucleotide sequences of the genes responsible for synthesis of flagellar systems using blastp in a mutual-best-hit approach (e-value < 0.