01909nam a2200229Ia 4500 MX-MdCICY 20260521091619.0 CICY B-18101 Engineered PPR proteins as inducible switches to activate the expression of chloroplast transgenes Nature Plants, 5(5), p.505, 2019 The engineering of plant genomes presents exciting opportunities to modify agronomic traits and to produce high-value products in plants. Expression of foreign proteins from transgenes in the chloroplast genome offers advantages that include the capacity for prodigious protein output, the lack of transgene silencing and the ability to express multicomponent pathways from polycistronic mRNA. However, there remains a need for robust methods to regulate plastid transgene expression. We designed orthogonal activators that boost the expression of chloroplast transgenes harbouring cognate cis-elements. Our system exploits the programmable RNA sequence specificity of pentatricopeptide repeat proteins and their native functions as activators of chloroplast gene expression. When expressed from nuclear transgenes, the engineered proteins stimulate the expression of plastid transgenes by up to ~40-fold, with maximal protein abundance approaching that of Rubisco. This strategy provides a means to regulate and optimize the expression of foreign genes in chloroplasts and to avoid deleterious effects of their products on plant growth. EXPRESSION OF CHLOROPLAST TRANSGENES Rojas, M. Yu, Q. Williams-Carrier, R. Maliga, P. Barkan, A. https://drive.google.com/file/d/1BCPscCbmhZ4QaBqx4VLEbRFDuynEWBZh/view?usp=drivesdk Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx Loc REF1 250602s9999 xx |||||s2 |||| ||und|d 28198 28198 0 0 Loc 0 0 F1 CICY CICY RE 2025-06-25 0 B-18101 2025-06-25 16:02:23 2025-06-25 REF1