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AtNPR4 from Arabidopsis thaliana: expression, purification, crystallization and crystallographic analysis.

Acta Crystallogr F Struct Biol Commun. 2019 Jan 01;75(Pt 1):67-72. Epub 2019 Jan 01
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摘要


Salicylic acid (SA) is an important phytohormone that is involved in the regulation of plant defence, growth and development. A large number of proteins have been shown to have the ability to interact with SA, and NPR4 has been demonstrated to be a receptor of SA that plays significant roles in the innate immune response of plants. In this study, Spodoptera frugiperda (Sf9) cells were used to express full-length AtNPR4 from Arabidopsis thaliana. To facilitate crystallization, T4 lysozyme (T4L) was added to the N-terminus of the AtNPR4 protein. The recombinant T4L-AtNPR4 protein was expressed, purified and crystallized using the sitting-drop and hanging-drop vapour-diffusion methods. The T4L-AtNPR4 crystals have symmetry consistent with space group C2, with unit-cell parameters a = 93.7, b = 85.8, c = 88.2 Å, β = 90° and one molecule per asymmetric unit. The best crystal diffracted to a resolution of 2.75 Å. Structure determination is in progress.

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