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A hyperactive calcium dependent antifreeze protein in an Antarctic bacterium


Gilbert, J and Davies, P and Laybourn-Parry, J, A hyperactive calcium dependent antifreeze protein in an Antarctic bacterium, FEMS Microbiology Letters, 245, (1) pp. 67-72. ISSN 0378-1097 (2005) [Refereed Article]

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DOI: doi:10.1016/j.femsle.2005.02.022


In cold climates, some plants and bacteria that cannot avoid freezing use antifreeze proteins (AFPs) to lessen the destructive effects of ice recrystallization. These AFPs have weak freezing point depression activity, perhaps to avoid sudden, uncontrolled growth of ice. Here, we report on an uncharacteristically powerful bacterial AFP found in an Antarctic strain of the bacterium, Marinomonas primoryensis. It is Ca2+-dependent, shows evidence of cooperativity, and can produce over 2 rC of freezing point depression. Unlike most AFPs, it does not produce obvious crystal faceting during thermal hysteresis. This AFP might be capable of imparting freezing avoidance to M. primoryensis in ice-covered Antarctic lakes. A hyperactive bacterial AFP has not previously been reported.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Microbiology
Research Field:Microbial ecology
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:Laybourn-Parry, J (Professor Johanna Laybourn-Parry)
ID Code:49098
Year Published:2005
Web of Science® Times Cited:118
Deposited By:Research Division
Deposited On:2007-11-13
Last Modified:2022-07-06

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