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Cloning, overexpression, purification and preliminary crystallographic studies of a mitochondrial type II peroxiredoxin from Pisum sativum

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A cDNA encoding an open reading frame of 199 amino acids corresponding to a type II peroxiredoxin from Pisum sativum with its transit peptide was isolated by RT‐PCR. The 171‐amino‐acid mature protein (estimated molecular weight 18.6 kDa) was cloned into the pET3d vector and overexpressed in Escherichia coli. The recombinant protein was purified and crystallized by the hanging‐drop vapour‐diffusion technique. A full data set (98.2% completeness) was collected using a rotating‐anode generator to a resolution of 2.8 Å from a single crystal flash‐cooled at 100 K. X‐ray data revealed that the protein crystallizes in space group P1, with unit‐cell parameters a = 61.88, b = 66.40, c = 77.23 Å, α = 102.90, β = 104.40, γ = 99.07°, and molecular replacement using a theoretical model predicted from the primary structure as a search model confirmed the presence of six molecules in the unit cell as expected from the Matthews coefficient. Refinement of the structure is in progress.
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Keywords: Pisum sativum; mitochondrial type II peroxiredoxin

Document Type: Research Article

Publication date: July 1, 2006

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