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3CL protease, a viral chymotrypsin-like proteolytic enzyme, plays a pivotal role in the transcription and replication machinery of many RNA viruses, including porcine reproductive and respiratory syndrome virus (PRRSV). In this study, the full-length 3CL protease from PRRSV was cloned and overexpressed in Escherichia coli. Crystallization experiments yielded crystals that diffracted to 2.1 Å resolution and belong to space group C2, with unit-cell parameters a = 112.31, b = 48.34, c = 42.88 Å, β = 109.83°. The Matthews coefficient and the solvent content were calculated to be 2.49 Å3 Da−1 and 50.61%, respectively, for one molecule in the asymmetric unit.

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