Bacillus megaterium
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Classification
Here is a top-view image of a plate streaked with Bacillus Megaterium and incubated at room temperature for 24 hours.
Higher order taxa
Kingdom: Bacteria
Phylum: Firmicutes
Class: Bacilli
Order: Bacillales
Family: Bacillaceae
Genus: Bacillus
Species: B. megaterium
Species
Genus: Bacillus
Description and significance
Bacillus Megaterium is a Gram Positive, Rod Shaped Endospore-Forming Bacteria. It is considered Aerobic, but, it is also capable of growing under anaerobic conditions when necessary. One of the largest Eubacteria found in soil, and hence the name “mega” means “relatively big” is a common soil saprophyte. A saprophyte is an organism, especially a fungus or bacterium, that lives on and gets its nourishment from dead organisms or decaying organic material. Saprophytes recycle organic material in the soil, breaking it down into in simpler compounds that can be taken up by other organisms. Bacillus Megaterium are also found in chains where the cells are joined together by polysaccharides on the cell walls and synthesizes a capsule composed of both polypeptide and polysaccharide. Bacillus Megaterium is also able to survive in extreme conditions such as desert environments due to the spores it forms.
Here are two images showing the structure and shape of each Bacillus Megaterium:
http://www.magma.ca/~scimat/B_mega101.jpg
http://dept.kent.edu/microbiology/images/bmeg.jpg
Genome structure
Bacillus Megaterium has been studied since the 1940's because it was one of the only species to have 100% of a culture sporulate as well as the ability to germinate at the same rate. It is about two times greater in volume compared to that of an E. coli. The larger size has allowed several proteins to be successfully studied, along with further membrane research. Such research include that of Cell division, DNA-protein, protein-protein and protein-RNA interactions, protein transport, secretion, and recycling. The size comparison to most other Bacilli would be very interesting to study from a Genomic perspective.
Here is an image showing us the structure of a Bacillus Megaterium:
http://www.textbookofbacteriology.net/Bac.murein.jpeg
The single strain has been used for many studies on various aspects of spore physiology and cell wall structure. Some of the uses in the environmental and industrial applications are:
* glucose dehydrogenase
* penicillin aminidase
* vitamin B12
* oxetanocin
* P450 cytochromes
* biodegradation enzymes
Here is an image showing us the different uses/ advances for our environmental and industrials needs:
http://www.bios.niu.edu/vary/bmeg_graphic.jpg
Cell structure and metabolism
Bacillus Megaterium is a prokaryotic cell, lacking membrane-bound organelles. It is a gram-positive, rod-shaped and found with other bacillus megaterium organisms. It is motile, with the use of its flagella. The cell wall, has large amounts of peptidoglycan. The flow of energy in cellular respiration is considered aerobic, but may undergo anaerobic conditions. They are like most gram-positive bacteria, that have the surface of Bacillus Megaterium, which is complex and is combined with their properties of resistance in extreme conditions, due to formation of spores. The cell surface is a laminated structure that consists of a capsule, a proteinaceous surface layer (S-layer), several layers of peptidoglycan sheeting, and the proteins on the outer surface of the plasma membrane. Also, plasmid content and cloning such as connecting many plasmids, rolling circle vectors that are stable, and efficient for secretion, and lacking extracellular alkaline proteases. However, large plasmids may be involved in horizontal gene transfer, such as integrase, recombinase, transposases, mobilization, and relaxase genes.
Here is an image showing the Cell Structure of a Gram-Positive Bacillus Megaterium:
http://www.textbookofbacteriology.net/B.anthracis.surface.EM.PI.jpeg
Ecology
Describe any interactions with other organisms (included eukaryotes), contributions to the environment, effect on environment, etc.
Pathology
How does this organism cause disease? Human, animal, plant hosts? Virulence factors, as well as patient symptoms.
Application to Biotechnology
Does this organism produce any useful compounds or enzymes? What are they and how are they used?
Current Research
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