Abstract
7,10,13-Hexadecatrienoic acid (16:3) is abundant in many plant species. However, its metabolism through the lipoxygenase pathway is not sufficiently understood. The goal of present work was to investigate the oxygenation of 16:3 by different plant lipoxygenases and to study the occurrence of oxygenated derivatives of 16:3 in plant seedlings. The recombinant maize 9-lipoxygenase specifically converted 16:3 into (7S)-hydroperoxide. Identification of this novel oxylipin was substantiated by data of GC-MS, LC-MS/MS, 1H-NMR, and 2D-COSY as well as by deuterium labeling from [2H6]16:3. Soybean lipoxygenase 1 produced 91% (11S)-hydroperoxide and 6% racemic 14-hydroperoxide. Recombinant soybean lipoxygenase 2 (specifically oxidizing linoleate into 13-hydroperoxide) lacked any specificity towards 16:3. Lipoxygenase 2 produced 7-, 8-, 10-, 11-, 13-, and 14-hydroperoxides of 16:3, as well as a significant amount of bis-allylic 9-hydroperoxide. Seedlings of several examined plant species possessed free hydroxy derivatives of 16:3 (HHTs), as well as their ethyl esters. Interestingly, HHTs occur not only in “16:3 plants”, but also in typical “18:3 plants” like pea and soybean seedlings.
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Abbreviations
- CP-HPLC:
-
chiral phase HPLC
- GC-MS:
-
gas chromatography-mass spectrometry
- GmLOX-1:
-
soybean lipoxygenase-1
- GmLOX-2:
-
soybean lipoxygenase-2
- 7-H(P)HT:
-
(8E,10Z,13Z)-7-hydro(pero)xy-8,10,13-hexadecatrienoic acid
- H(P)HT:
-
hydro(pero)xyhexadecatrienoic acid
- H(P)OD:
-
hydro(pero)xide of linoleic acid
- H(P)OT:
-
hydro(pero)xide of α-linolenic acid
- NP-HPLC:
-
normal phase HPLC
- ZmLOX:
-
maize 9-lipoxygenase
- 16:3:
-
(7Z,10Z,13Z)-7,10,13-hexadecatrienoic acid
- 18:3:
-
α-linolenic acid
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Published in Russian in Biokhimiya, 2010, Vol. 75, No. 6, pp. 796–806.
Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM09-370, March 28, 2010.
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Osipova, E.V., Lantsova, N.V., Chechetkin, I.R. et al. Hexadecanoid pathway in plants: Lipoxygenase dioxygenation of (7Z,10Z,13Z)-hexadecatrienoic acid. Biochemistry Moscow 75, 708–716 (2010). https://doi.org/10.1134/S0006297910060052
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DOI: https://doi.org/10.1134/S0006297910060052