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Expression, purification and characterization of pectate lyase A from Aspergillus nidulans in Escherichia coli

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Abstract

Pectate lyase A (PelA) of Aspergillus nidulans was successfully expressed in Escherichia coli and effectively purified using a Ni2+-nitrilotriacetate-agarose column. Enzyme activity of the recombinant PelA could reach 360 U ml−1 medium. The expressed PelA exhibited its optimum level of activity over the range of pH 7.5–10 at 50°C. Mn2+, Ca2+, Fe2+, Mg2+ and Fe3+ ions stimulated the pectate lyase activity, but Cu2+ and Zn2+ inhibited it. The recombinant PelA had a V max of 77 μmol min−1 mg−1 and an apparent K m of 0.50 mg ml−1 for polygalacturonic acid. Low-esterified pectin was the optimum substrate for the PelA, whereas higher-esterified pectin was hardly cleaved by it. PelA efficiently macerated mung bean hypocotyls and potato tuber tissues into single cells.

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Acknowledgments

This work was supported by the funds from the National Natural Science Foundation of China (30170005) and the Natural Science Foundation of Jiangsu Province (BK2005136).

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Correspondence to Sheng Yuan.

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Zhao, Q., Yuan, S., Zhang, Y. et al. Expression, purification and characterization of pectate lyase A from Aspergillus nidulans in Escherichia coli . World J Microbiol Biotechnol 23, 1057–1064 (2007). https://doi.org/10.1007/s11274-006-9331-1

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  • DOI: https://doi.org/10.1007/s11274-006-9331-1

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