Abstract
The quantity and composition of tocopherols (compounds with vitamin E activity) vary widely among different plant species reflecting the expression, activity and substrate specificity of enzymes in the corresponding metabolic pathway. Two Arabidopsis cDNA clones corresponding to ρ-hydroxyphenylpyruvate dioxygenase (HPPD) and 2-methyl-6-phytylplastoquinol methyltransferase (MPBQ MT) were constitutively expressed in corn to further characterize the pathway and increase the kernel tocopherol content. Transgenic kernels contained up to 3 times as much γ-tocopherol as their wild type counterparts whereas other tocopherol isomers remained undetectable. Biofortification by metabolic engineering offers a sustainable alternative to vitamin E supplementation for the improvement of human health.
References
Bramley P, Elmadfa I, Kafatos A, Kelly FJ, Manios Y, Roxborough HE, Schuch W, Sheehy PJA, Wagner K-H (2000) Vitamin E. J Sci Food Agric 80:913–938
Burton GW, Traber MG, Acuff RV, Walters DN, Kayden H, Hughes L, Ingold KU (1998) Human plasma and tissue a-tocopherol concentrations in response to supplementation with deuterated natural and synthetic vitamin E. Am J Clin Nutr 67:669–684
Christensen AH, Quail PH (1996) Ubiquitin promoter-based vectors for high level expression of selectable and/or screenable marker genes in monocotyledonous plants. Transgenic Res 5:213–218
DellaPenna D, Last RL (2006) Progress in the dissection and manipulation of plant vitamin E biosynthesis. Physiol Planta 126:356–368
Falk J, Andersen G, Kernebeck B, Krupinska K (2003) Constitutive over-expression of barley 4-hydroxyphenylpyruvate dioxygenase in tobacco results in elevation of the vitamin E content in seeds but not in leaves. FEBS Lett 540:35–40
Gomez-Galera S, Rojas E, Sudhakar D, Zhu C, Pelacho AM, Capell T, Christou P (2009) Critical evaluation of strategies for mineral fortification of staple food crops. Transgenic Res 19:165–180
Grusak MA, DellaPenna D (1999) Improving the nutrient composition of plants to enhance human nutrition and health. Annu Rev Plant Physiol Plant Mol Biol 50:133–161
Munne-Bosch S, Alegre L (2002) The function of tocopherols and tocotrienols in plants. Crit Rev Plant Sci 21:31–57
Naqvi S, Zhu C, Farre G, Ramessar K, Bassie L, Breitenbach J, Conesa D, Ros G, Sandmann G, Capell T, Christou P (2009) Transgenic multivitamin corn through biofortification of endosperm with three vitamins representing three distinct metabolic pathways. Proc Natl Acad Sci USA 106:7762–7767
Raclaru M, Gruber J, Kumar R, Sadre R, Luhs W, Zarhloul K, Friedt W, Frentzen M, Weier D (2006) Increase of the tocochromanol content in transgenic Brassica napus seeds by overexpression of key enzymes involved in prenylquinone biosynthesis. Mol Breed 18:93–107
Ricciarelli R, Zingg JM, Azzi A (2001) Vitamin E: protective role of a Janus molecule. FASEB J 15:2314–2325
Shintani DK, DellaPenna D (1998) Elevating the vitamin E content of plants though metabolic engineering. Science 282:2098–2100
Soll J, Schultz G, Joyard J, Douce R, Block MA (1985) Localization and synthesis of prenylquinones in isolated outer and inner envelope membranes from spinach chloroplasts. Arch Biochem Biophys 238:290–299
Traber MG, Sies H (1996) Vitamin E in humans—demand and delivery. Annu Rev Nutr 16:321–347
Tsegaye Y, Shintani DK, DellaPenna D (2002) Overexpression of the enzyme p hydroxyphenolpyruvate dioxygenase in Arabidopsis and its relation to tocopherol biosynthesis. Plant Physiol Biochem 40:913–920
Van Eenennaam AL, Lincoln K, Durrett TP, Valentin HE, Shewmaker CK, Thorne GM, Jiang J, Baszis SR, Levering CK, Aasen ED, Hao M, Stein JC, Norris SR, Last RL (2003) Engineering vitamin E content: from Arabidopsis mutant to soy oil. Plant Cell 15:3007–3019
Zhu C, Naqvi S, Gomez-Galera S, Pelacho AM, Capell T, Christou P (2007) Transgenic strategies for the nutritional enhancement of plants. Trends Plant Sci 12:548–555
Zhu C, Naqvi S, Breitenbach J, Sandmann G, Christou P, Capell T (2008) Combinatorial genetic transformation generates a library of metabolic phenotypes for the carotenoids pathway in maize. Proc Natl Acad Sci USA 105:18232–18237
Acknowledgments
This study was supported by the Ministerio de Ciencia e Innovación, Spain (BFU2007-61413); BIOFORCE ERC advanced grant to PC; S.N. and G.F. are recipients of Ph.D. fellowships from Ministerio de Ciencia e Innovación, Spain (BES-2005-9161).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Naqvi, S., Farré, G., Zhu, C. et al. Simultaneous expression of Arabidopsis ρ-hydroxyphenylpyruvate dioxygenase and MPBQ methyltransferase in transgenic corn kernels triples the tocopherol content. Transgenic Res 20, 177–181 (2011). https://doi.org/10.1007/s11248-010-9393-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11248-010-9393-6