Biological Nitrogen Removal Database

denitrifying bacterium 72Chol

• Phylum : Proteobacteria
• Class : Alphaproteobacteria
• Order :Rhodobacterales
• Family : Rhodobacteraceae
• Genus : nan

NO₃^-

Cholesterol 

Reference:Harder and Probian, 1997

Title:Anaerobic Mineralization of Cholesterol by a Novel Type of Denitrifying Bacterium

Pubmed ID:9094222

Pubmed link:Link

Full research link:Link

Abstract: A novel denitrifying bacterium, strain 72Chol, was enriched and isolated under strictly anoxic conditions on cholesterol as sole electron donor and carbon source. Strain 72Chol grew on cholesterol with oxygen or nitrate as electron acceptor. Strictly anaerobic growth in the absence of oxygen was demonstrated using chemically reduced culture media. During anaerobic growth, nitrate was initially reduced to nitrite. At low nitrate concentrations, nitrite was further reduced to nitrogen gas. Ammonia was assimilated. The degradation balance measured in cholesterol-limited cultures and the amounts of carbon dioxide, nitrite, and nitrogen gas formed during the microbial process indicated a complete oxidation of cholesterol to carbon dioxide. A phylogenetic comparison based on total 16S rDNA sequence analysis indicated that the isolated micro-organism, strain 72Chol, belongs to the beta2-subgroup in the Proteobacteria and is related to Rhodocyclus, Thauera, and Azoarcus species.