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Ectodomain of plasmodesmata-localized protein 5 in Arabidopsis: expression, purification, crystallization and crystallographic analysis.

Plasmodesmata-localized protein 5 (PDLP5) is a cysteine-rich receptor-like protein which is localized on the plasmodesmata of Arabidopsis thaliana. Overexpression of PDLP5 can reduce the permeability of the plasmodesmata and further affect the cell-to-cell movement of viruses and macromolecules in plants. The ectodomain of PDLP5 contains two DUF26 domains; however, the function of these domains is still unknown. Here, the ectodomain of PDLP5 from Arabidopsis was cloned and overexpressed using an insect expression system and was then purified and crystallized. X-ray diffraction data were collected to 1.90 Å resolution and were indexed in space group P1, with unit-cell parameters a = 41.9, b = 48.1, c = 62.2 Å, α = 97.3, β = 103.1, γ = 99.7°. Analysis of the crystal content indicated that there are two molecules in the asymmetric unit, with a Matthews coefficient of 2.51 Å3 Da-1 and a solvent content of 50.97%.