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Purification and Characterization of a Cold-Adapted α-Amylase Produced by Nocardiopsis sp. 7326 Isolated from Prydz Bay, Antarctic

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Abstract

An actinomycete strain 7326 producing cold-adapted α-amylase was isolated from the deep sea sediment of Prydz Bay, Antarctic. It was identified as Nocardiopsis based on morphology, 16S rRNA gene sequence analysis, and physiological and biochemical characteristics. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and zymogram activity staining of purified amylase showed a single band equal to a molecular mass of about 55 kDa. The optimal activity temperature of Nocardiopsis sp. 7326 amylase was 35°C, and the activity decreased dramatically at temperatures above 45°C. The enzyme was stable between pH 5 and 10, and exhibited a maximal activity at pH 8.0. Ca2+, Mn2+, Mg2+, Cu2+, and Co2+ stimulated the activity of the enzyme significantly, and Rb2+, Hg2+, and EDTA inhibited the activity. The hydrolysates of soluble starch by the enzyme were mainly glucose, maltose, and maltotriose. This is the first report on the isolation and characterization of cold-adapted amylase from Nocardiopsis sp.

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Acknowledgments

This work was supported by National Natural Science Funds of China (No. 40406029).

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Authors and Affiliations

  1. Key Laboratory of Marine Biogenetic Resources, State Oceanic Administration, Xiamen, People’s Republic of China

    Jin-Wei Zhang & Run-Ying Zeng

  2. Third Institute of Oceanography, State Oceanic Administration, Xiamen, People’s Republic of China

    Jin-Wei Zhang & Run-Ying Zeng

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  1. Jin-Wei Zhang
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  2. Run-Ying Zeng
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Correspondence to Run-Ying Zeng.

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Zhang, JW., Zeng, RY. Purification and Characterization of a Cold-Adapted α-Amylase Produced by Nocardiopsis sp. 7326 Isolated from Prydz Bay, Antarctic. Mar Biotechnol 10, 75–82 (2008). https://doi.org/10.1007/s10126-007-9035-z

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  • DOI: https://doi.org/10.1007/s10126-007-9035-z

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