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Purification and Characterization of Alkaline Pectin Lyase from a Newly Isolated Bacillus clausii and Its Application in Elicitation of Plant Disease Resistance

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Abstract

Alkaline pectin lyase (PNL) shows potential as a biological control agent against several plant diseases. We isolated and characterized a new Bacillus clausii strain that can produce 4,180 U/g of PNL using sugar beet pulp as a carbon source and inducer. The PNL was purified to apparent homogeneity using ultrafiltration, ammonium sulfate fractionation, DEAE Sepharose Fast Flow, and Sephadex G-75 gel filtration. The purified PNL was found to be a monomeric protein with a molecular weight of 35 kDa, as determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). It demonstrated optimal activity with K m of 0.87 mg/ml at pH 10.0 and 60 °C. The enzyme is stable in the pH range of 8.0–10.0 and temperature ≤40 °C. Ca2+ was found to stimulate the enzymatic activity of the PNL by up to 410 %. Mass spectrometric results gave 38 % match coverage with pectate lyase from B. clausii KSM-K16 (gi|56961845). The PNL was found to elicit disease resistance in cucumber seedlings, suggesting that it may have applications in biocontrol and sustainable agriculture.

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Acknowledgments

This work was supported by Subsidy for Outstanding People of Beijing (No. 2011A005022 000004), the “Knowledge Innovation” Program of Chinese Academy of Sciences (No. KZZD-EW-09-3), the National Key Technology R&D Program of China (No. 2009BAC57B02), and Beijing Municipal Commission of Education (No. KM200811417006).

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Correspondence to Zhihui Bai.

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Li, Z., Bai, Z., Zhang, B. et al. Purification and Characterization of Alkaline Pectin Lyase from a Newly Isolated Bacillus clausii and Its Application in Elicitation of Plant Disease Resistance. Appl Biochem Biotechnol 167, 2241–2256 (2012). https://doi.org/10.1007/s12010-012-9758-9

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