Journal
CANADIAN JOURNAL OF MICROBIOLOGY
Volume 60, Issue 11, Pages 717-727Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjm-2014-0233
Keywords
haloalkaliphile; compatible solutes; secondary metabolites; exoenzymes; biodegradation and (or) biotransformation; biofuel industry
Categories
Funding
- National Natural Science Foundation of China [31370158]
- Basic Research Fund of Chinese Academy of Agricultural Sciences [0042014011]
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Haloalkaliphiles are microorganisms requiring Na+ concentrations of at least 0.5 mol . L-1 and an alkaline pH of 9 for optimal growth. Their unique features enable them to make significant contributions to a wide array of biotechnological applications. Organic compatible solutes produced by haloalkaliphiles, such as ectoine and glycine betaine, are correlated with osmoadaptation and may serve as stabilizers of intracellular proteins, salt antagonists, osmoprotectants, and dermatological moisturizers. Haloalkaliphiles are an important source of secondary metabolites like rhodopsin, polyhydroxyalkanoates, and exopolysaccharides that play essential roles in biogeocycling organic compounds. These microorganisms also can secrete unique exoenzymes, including proteases, amylases, and cellulases, that are highly active and stable in extreme haloalkaline conditions and can be used for the production of laundry detergent. Furthermore, the unique metabolic pathways of haloalkaliphiles can be applied in the biodegradation and (or) biotransformation of a broad range of toxic industrial pollutants and heavy metals, in wastewater treatment, and in the biofuel industry.
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