The biochemistry of headgroup exchange during triacylglycerol synthesis in canola.

Autor: Bai S; Institute of Biological Chemistry, Washington State University, PO Box 646340, Pullman, WA, 99164-6340, USA., Wallis JG; Institute of Biological Chemistry, Washington State University, PO Box 646340, Pullman, WA, 99164-6340, USA., Denolf P; BASF Innovation Center Gent, NV Technologiepark 101, B-9052, Ghent, Belgium., Engelen S; BASF Innovation Center Gent, NV Technologiepark 101, B-9052, Ghent, Belgium., Bengtsson JD; Institute of Biological Chemistry, Washington State University, PO Box 646340, Pullman, WA, 99164-6340, USA., Van Thournout M; BASF Innovation Center Gent, NV Technologiepark 101, B-9052, Ghent, Belgium., Dierickx J; BASF Innovation Center Gent, NV Technologiepark 101, B-9052, Ghent, Belgium., Haesendonckx B; BASF Innovation Center Gent, NV Technologiepark 101, B-9052, Ghent, Belgium., Browse J; Institute of Biological Chemistry, Washington State University, PO Box 646340, Pullman, WA, 99164-6340, USA.
Jazyk: angličtina
Zdroj: The Plant journal : for cell and molecular biology [Plant J] 2020 Jul; Vol. 103 (1), pp. 83-94. Date of Electronic Publication: 2020 Feb 19.
DOI: 10.1111/tpj.14709
Abstrakt: Many pathways of primary metabolism are substantially conserved within and across plant families. However, significant differences in organization and fluxes through a reaction network may occur, even between plants in closely related genera. Assessing and understanding these differences is key to appreciating metabolic diversity, and to attempts to engineer plant metabolism for higher crop yields and desired product profiles. To better understand lipid metabolism and seed oil synthesis in canola (Brassica napus), we have characterized four canola homologues of the Arabidopsis (Arabidopsis thaliana) ROD1 gene. AtROD1 encodes phosphatidylcholine:diacylglycerol cholinephosphotransferase (PDCT), the enzyme that catalyzes a major flux of polyunsaturated fatty acids (PUFAs) in oil synthesis. Assays in yeast indicated that only two of the canola genes, BnROD1.A3 and BnROD1.C3, encode active isozymes of PDCT, and these genes are strongly expressed during the period of seed oil synthesis. Loss of expression of BnROD1.A3 and BnROD1.C3 in a double mutant, or by RNA interference, reduced the PUFA content of the oil to 26.6% compared with 32.5% in the wild type. These results indicate that ROD1 isozymes in canola are responsible for less than 20% of the PUFAs that accumulate in the seed oil compared with 40% in Arabidopsis. Our results demonstrate the care needed when translating results from a model species to crop plants.
(© 2020 The Authors The Plant Journal © 2020 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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