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Expression and purification of a novel mannose-binding lectin from Pinellia ternata

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Abstract

Pinellia ternata agglutinin (PTA) from the tubers of P. ternata is a monocot mannose-binding lectin that catalytically agglutinated rabbit erythrocytes. The potential effect of PTA has gained considerable interest in recent years owing to clinical use of native PTA as the preparation against cancer and for plant protection against insect pests. Here we report a successful strategy to allow high-level expression of PTA as inclusion bodies in Escherichia coli M15. Purification of refolded recombinant protein from solubilized inclusion bodies by Ni-NTA agarose affinity chromatography yielded biological activity recombinant PTA (final yield of about 10 mg/L). The recombinant PTA agglutinated rabbit erythrocytes to a dilution similar to that determined for “native” lectin purified from P. ternata. The expression and purification system makes it possible to obtain sufficient quantities of biologically active and homogenous recombinant PTA sufficient to carry out advanced clinical trials. This is the first report on the large-scale expression and purification of biologically active recombinant PTA from E. coli.

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Correspondence to Kexuan Tang.

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Lin, J., Yao, J., Zhou, X. et al. Expression and purification of a novel mannose-binding lectin from Pinellia ternata . Mol Biotechnol 25, 215–221 (2003). https://doi.org/10.1385/MB:25:3:215

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