01977nam a2200277Ia 4500 MX-MdCICY 20260521091243.0 CICY B-11397 Engineering of an endogenous phytoene desaturase gene as a dominant selectable marker for Chlamydomonas reinhardtii transformation and enhanced biosynthesis of carotenoids Process Biochemistry, 48(5-6), p.788-795, 2013 Artículo A phytoene desaturase (PDS) gene was cloned and characterized from the unicellular green microalga Chlamydomonas reinhardtii. Functional complementation analysis revealed C. reinhardtii PDS (CrPDS) catalyzes the conversion of phytoene to the colored carotenoid ζ-carotene. A single amino acid substitution, L505F, enhanced its desaturation activity by 29 percent, as indicated by an in vitro enzymatic assay. In addition, CrPDS-L505F exhibited 27.7-fold higher resistance to the herbicide norflurazon. Glass bead-mediated delivery displayed a high transformation efficiency of C. reinhardtii with CrPDS-L505F, demonstrating clearly that the engineered endogenous CrPDS is a dominant selectable marker for C. reinhardtii and possibly for other green algae. Furthermore, the expression of PDS could enhance the intracellular carotenoid accumulation of transformants, opening up the possibility of engineering the carotenogenic pathway for improved carotenoid production in microalgae. CHLAMYDOMONAS REINHARDTII CAROTENOIDS NORFLURAZON PHYTOENE DESATURASE SELECTABLE MARKER SITE-DIRECTED MUTATION Liu, J. Gerken, H. Chen, F. https://drive.google.com/file/d/1oH_z_2JQAKEUbmmcgB8TWvBJbpnEo3vN/view?usp=drivesdk Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx Loc REF1 250602s9999 xx |||||s2 |||| ||und|d 21555 21555 0 0 Loc 0 0 F1 CICY CICY RE 2025-06-25 0 B-11397 2025-06-25 14:06:49 2025-06-25 REF1