Molecular chaperone function of Arabidopsis thaliana phloem protein 2-A1, encodes a protein similar to phloem lectin |
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Authors: | Jung Ro Lee Kara A Boltz Sang Yeol Lee |
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Institution: | 1. Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA;2. Division of Applied Life Sciences and PMBBRC, Gyeongsang National University, Jinju 660-701, Republic of Korea |
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Abstract: | 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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Keywords: | Arabidopsis thaliana Molecular chaperone Antifungal activity Phloem protein Lectin |
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