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MicrotetrasporaRANK: GenusTAXONOMY: Bacteria -> Terrabacteria group -> Actinobacteria -> Actinobacteria -> Streptosporangiales -> Streptosporangiaceae -> Microtetraspora OVERVIEW: Aerobic, Gram-stain-positive, non-acid-alcohol-fast, nonmotile, mesophilic actinomycetes which form stable, highly branched substrate and aerial mycelia. Spore chains, typically contain four spores which are borne on short aerial hyphae. Spores are spherical (1.2–1.5 μm in diameter) or slightly oval to cylindrical (1.0–1.4 to 1.2–1.7 μm in diameter) and have smooth surfaces. Grows from 20–37°C, but not at 40°C. Some species require B vitamins for growth. Chemoorganotrophic with an oxidative type of metabolism. Cell walls contain N-acetylated muramic acid and major amounts of meso-diaminopimelic acid; has a type A1γ peptidoglycan. Contains complex mixtures of saturated, unsaturated, iso-, anteiso-, and branched chain fatty acids. Predominant menaquinones have nine isoprene units with hydrogenation at positions III and IV [MK-9(III, IV-H4)]. Major phospholipids are diphosphatidylglycerol, phosphatidylethanolamine, hydroxyl-phosphatidylethanolamine, and ninhydrin-positive glycophospholipids. Common in soils. DNA G+C content (mol%): 69–71. Type species: Microtetraspora glauca |