ACYL-ACYL CARRIER PROTEIN DESATURASE2 and 3 are responsible for making omega-7 fatty acids in the Arabidopsis aleurone

A - Papers appearing in refereed journals

Bryant, F. M., Munoz-Azcarate, O., Kelly, A. A., Beaudoin, F., Kurup, S. and Eastmond, P. J. 2016. ACYL-ACYL CARRIER PROTEIN DESATURASE2 and 3 are responsible for making omega-7 fatty acids in the Arabidopsis aleurone. Plant Physiology. 172 (1), pp. 154-162.

AuthorsBryant, F. M., Munoz-Azcarate, O., Kelly, A. A., Beaudoin, F., Kurup, S. and Eastmond, P. J.
Abstract

Omega-7 monounsaturated fatty acids (ω-7s) are specifically enriched in the aleurone of Arabidopsis (Arabidopsis thaliana) seeds. We found significant natural variation in seed ω-7 content and used a Multiparent Advanced Generation Inter-Cross population to fine-map a major quantitative trait loci to a region containing ACYL-ACYL CARRIER PROTEIN DESATURASE1 (AAD1) and AAD3. We found that AAD3 expression is localized to the aleurone where mutants show an approximately 50% reduction in ω-7 content. By contrast, AAD1 is localized to the embryo where mutants show a small reduction in ω-9 content. Enzymatic analysis has previously shown that AAD family members possess both stearoyl- and palmitoyl-ACP Δ9 desaturase activity, including the predominant isoform SUPPRESSOR OF SALICYLIC ACID INSENSITIVE2. However, aad3 ssi2 aleurone contained the same amount of ω-7s as aad3. Within the AAD family, AAD3 shares the highest degree of sequence similarity with AAD2 and AAD4. Mutant analysis showed that AAD2 also contributes to ω-7 production in the aleurone, and aad3 aad2 exhibits an approximately 85% reduction in ω-7s. Mutant analysis also showed that FATTY ACID ELONGASE1 is required for the production of very long chain ω-7s in the aleurone. Together, these data provide genetic evidence that the ω-7 pathway proceeds via Δ9 desaturation of palmitoyl-ACP followed by elongation of the product. Interestingly, significant variation was also identified in the ω-7 content of Brassica napus aleurone, with the highest level detected being approximately 47% of total fatty acids.

Year of Publication2016
JournalPlant Physiology
Journal citation172 (1), pp. 154-162
Digital Object Identifier (DOI)doi:10.1104/pp.16.00836
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Seeds for Nutrition and Health (DS)
Designing oilseeds for nutrition and health
*Design Oilseeds (Peter Eastmond)
Publisher's version
Copyright license
CC BY
Output statusPublished
Publication dates
Online30 Aug 2016
Publication process dates
Accepted22 Jul 2016
ISSN0032-0889
PublisherAmerican Society of Plant Biologists (ASPB)

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