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Methyl-end desaturases with Δ12 and ω3 regioselectivities enable the de novo PUFA biosynthesis in the cephalopod Octopus vulgaris

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untranslatedGarrido 2019 (BBA Wx Octopus).pdf (1.313Mb)
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URI: http://hdl.handle.net/10508/12482
ISSN: 0006-3002
DOI: 10.1016/j.bbalip.2019.04.012
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Authors
Garrido, D. (Diego); Kabeya N; Hontoria F.; Navarro JC; Reis DB; Martín, M.V. (María Virginia); Rodríguez C; Almansa, E. (Eduardo); Monroig Ó.
Editor's version
https://www.sciencedirect.com/science/article/abs/pii/S1388198119300654?via%3Dihub
Date
2019-04-30
Type
article
Abstract
The interest in understanding the capacity of aquatic invertebrates to biosynthesise omega-3 (ω3) long-chain (≥C20) polyunsaturated fatty acids (LC-PUFA) has increased in recent years. Using the common octopus Octopus vulgaris as a model species, we previously characterised a ∆5 desaturase and two elongases (i.e. Elovl2/5 and Elovl4) involved in the biosynthesis of LC-PUFA in molluscs. The aim of this study was to characterise both molecularly and functionally, two methyl-end (or ωx) desaturases that have been long regarded to be absent in most animals. O. vulgaris possess two ωx desaturase genes encoding enzymes with ∆12 and ω3 regioselectivities enabling the de novo biosynthesis of the C18 PUFA 18:2ω6 (LA, linoleic acid) and 18:3ω3 (ALA, α-linolenic acid), generally regarded as dietary essential for animals. The O. vulgaris ∆12 desaturase (“ωx2”) mediates the conversion of 18:1ω9 (oleic acid) into LA, and subsequently, the ω3 desaturase (“ωx1”) catalyses the ∆15 desaturation from LA ...

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