Acetobacterium woodii
Vivian Anter

Acetobacterium woodii is an anaerobic acteogenic bacterium, and is heterotrophic  nutrition based. It is primarily kept at room temperature of 30˚C under 100% Nitogen. This organism primarily reduces sulfate and elemental sulfur(S) to yielding sulpur(S₂ ̄). They also undergo an important reaction called Acetogenesis.Acetogenesis is a biological reaction where volatile fatty acids are converted into acetic acid, carbon dioxide and hydrogen.

Acetogens are strictly anaerobic bacteria that are key players in the anaerobic food web. They are nutritionally very versatile and ferment compounds such as sugars, alcohols or C1 compounds to acetate (and CO₂) which is then converted to methane by methanogenic archaea in non-marine ecosystems. Acetogenic bacteria are characterized by a unique pathway, the Wood-Ljungdahl pathway, that enables the use of CO₂ as electron acceptor during heterotrophic as well as autotrophic growth. During heterotrophic growth, hexoses are oxidized to 2 mol pyruvate viathe Embden-Meyerhof-Parnas pathway, and pyruvate is subsequently oxidized to acetyl-CoA, CO2 and reduced ferredoxin. Acetyl-CoA is converted to acetate by the enzymes phosphotransacetylase and acetate kinase with the latter reaction coupled to substrate level phosphorylation. The electrons are funneled to CO2 which is reduced to acetate in the Wood-Ljungdahl pathway according to:

2CO₂ + 8[H]  →  CH₃COOH   +  2H₂O

References

"Acetobacterium woodii." Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 23 Feb. 2009 <http://www.britannica.com/EBchecked/topic/3266/Acetobacterium-woodii>.
http://www.atcc.org/ATCCAdvancedCatalogSearch/ProductDetails/tabid/452/Default.aspx
http://www.wdcm.org/servlet/search.ViewEntry?item=BactNam&id=26
http://aem.asm.org/cgi/reprint/AEM.02060-06v1.pdf

http://microbiology.scu.edu.tw/micro/bacteria/picture/A71.jpg
*Disclaimer - This report was written by a student participaring in a microbiology course at the Missouri University of Science and Technology. The accuracy of the contents of this report is not guaranteed and it is recommended that you seek additional sources of information to verify the contents.

 

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