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A low-temperature-active alkaline esterase, Est12, from a marine sediment metagenomic fosmid library was identified. Est12 prefers short- and middle-chain p-nitrophenol esters as substrate with optimum temperature and pH value of 50 °C and 9.0, respectively, and nearly 50 % of maximum activity retained at 5 °C. The hydrolysis activity of Est12 was stable at 40 °C. Ca2+ especially activated the activity...
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