Identification of non-specific lipid transfer protein-1 as a calmodulin-binding protein in Arabidopsis |
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Authors: | Wang Zhe Xie Wanqin Chi Fang Li Cuifeng |
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Institution: | Department of Biochemistry and Molecular Biology, Nankai University, Tianjin 300071, PR China. |
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Abstract: | Although non-specific lipid transfer proteins (nsLTPs) are widely present in plants, their functions and regulations have not been fully understood. In this report, Arabidopsis nsLTP1 was cloned and expressed to investigate its binding to calmodulin (CaM). Gel overlay assays revealed that recombinant nsLTP1 bound to CaM in a calcium-independent manner. The association of nsLTP1 and CaM was corroborated using CaM-Sepharose beads to specifically isolate recombinant nsLTP1 from crude bacterial lysate. The CaM-binding site was mapped in nsLTP1 to the region of 69-80 amino acids. This region is highly conserved among plant nsLTPs, implicating that nsLTPs are a new family of CaM-binding proteins whose functions may be mediated by CaM signaling. |
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Keywords: | nsLTP1 non-specific lipid transfer protein-1 CaM calmodulin BAA amphiphilic α-helix EGTA ethyleneglycol-bis-(β-aminoethylether)-N N N′ N′-tetraacetic acid PMSF phenyl methylsulfonyl fluoride RT room temperature |
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