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Molecular chaperone function of Arabidopsis thaliana phloem protein 2-A1, encodes a protein similar to phloem lectin.

Biochem. Biophys. Res. Commun.2014 Jan 3;443(1):18-21. Epub 2013 Nov 20
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摘要


Although several phloem sap proteins have been identified from protein extracts of heat-treated Arabidopsis seedlings using FPLC gel filtration columns, many of the physiological roles played by these proteins remain to be elucidated. We functionally characterized a phloem protein 2-A1, which encodes a protein similar to phloem lectin. Using a bacterially expressed recombinant protein of AtPP2-A1, we found that it performs dual functions, showing both molecular chaperone activity and antifungal activity. mRNA expression of the AtPP2-1 gene was induced by diverse external stresses such as pathogens, and other signaling molecules, such as ethylene. These results suggest that the AtPP2-A1 molecular chaperone protein plays a critical role in the Arabidopsis defense system against diverse external stresses including fungal pathogenic attack and heat shock.

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