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Companion Protease Inhibitors for the In Situ Protection of Recombinant Proteins in Plants.

Robert, Stéphanie; Jutras, Philippe V; Khalf, Moustafa; D'Aoust, Marc-André; Goulet, Marie-Claire; Sainsbury, Frank; Michaud, Dominique.
Methods Mol Biol ; 1385: 115-26, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-26614285
We previously described a procedure for the use of plant protease inhibitors as "companion" accessory proteins to prevent unwanted proteolysis of clinically useful recombinant proteins in leaf crude protein extracts (Benchabane et al. Methods Mol Biol 483265-273, 2009). Here we describe the use of these inhibitors for the protection of recombinant proteins in planta, before their extraction from leaf tissues. A procedure is first described involving inhibitors co-expressed along-and co-migrating-with the protein of interest in host plant cells. An alternative, single transgene scheme is then described involving translational fusions of the recombinant protein and companion inhibitor. These approaches may allow for a significant improvement of protein steady-state levels in leaves, comparable to yield improvements observed with protease-deficient strains of less complex protein expression hosts such as E. coli or yeasts.