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Serine proteinase inhibitor proteins: Exogenous and endogenous functions

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Summary

Proteinase inhibitor II (PIN2) proteins from the Solanaceae family have been previously used in plant transformation to acquire protection against caterpillars. Some of these PIN2 proteins have been shown to exhibit exogenous activities against trypsin and/or chymotrypsin in vitro. Despite their application in conferring insect resistance in transgenic plants, the endogenous roles of this family of proteins in various plant species have not been well defined. To investigate the exogenous and endogenous functions of PIN2 proteins, cDNAs encoding PIN2 proteins from the weed Solanum americanum (American black nightshade), designated SaPIN2a and SaPIN2b, were cloned and characterized. The localization of S. americanum SaPIN2a and SaPIN2b mRNAs and proteins in the reproductive tissues destined to undergo developmental programmed cell death subsequently led to investigations into their function during seed development. Using plant transformation of lettuce and S. americanum, it was evident that: (1) the expression of SaPIN2a in transgenic lettuce conferred resistance to cabbage looper (Trichoplusia ni) caterpillars; and (2) the expression of siRNAs from a PIN2-RNAi construct resulted in transgenic S. americanum that were impaired in seed development. These results suggest that S. americanum PIN2 proteins not only enhance resistance to caterpillars (when expressed exogenously) but they function in inhibiting endogenous proteases that are expressed during seed development. Specifically, the aborted seeds of PIN2-RNAi lines showed abnormal endothelium that subsequently affected endosperm and embryo development.

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  1. Department of Botany, University of Hong Kong, Pokfulam Road, Hong Kong, China

    M. -L. Chye & S. -F. Sin

  2. Key Lab of Gene Engineering, Zhongshan University, 510275, Guangzhou, China

    Z. -F. Xu

  3. Department of Biological Sciences, University of Calgary, T2N 1N4, Calgary, Alberta, Canada

    E. C. Yeung

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Chye, M.L., Sin, S.F., Xu, Z.F. et al. Serine proteinase inhibitor proteins: Exogenous and endogenous functions. In Vitro Cell.Dev.Biol.-Plant 42, 100–108 (2006). https://doi.org/10.1079/IVP2005741

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