Priestia megaterium

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Priestia megaterium (Bacillus megaterium prior to 2020) is a rod-like, Gram-positive, mainly aerobic, spore forming bacterium found in widely diverse habitats. It has cells of roughly 1.5 μm by 4 μm (up to about 2.5 μm by 10 μm in some reports), which is quite large for bacteria and 100 times larger than Escherichia coli. The cells often occur in pairs and chains, where the cells are joined by polysaccharides on the cell walls. Before the rise of Bacillus subtilis as the dominant Gram-positive model organism, P. megaterium was widely used for studies on biochemistry, sporulation, and bacteriophages. Recently, its popularity has started increasing in the field of biotechnology for its recombinant protein-production capacity.

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