InChI=1S/C18H30O4/c1-2-16-14-12-15(19)18(22-16)13(14)10-8-6-4-3-5-7-9-11-17(20)21/h8,10,13-16,18-19H,2-7,9,11-12H2,1H3,(H,20,21)/p-1/b10-8-/t13-,14+,15+,16-,18+/m0/s1 |
QVWADKXXJXPCDQ-RAETWKFMSA-M |
C([O-])(=O)CCCCCCC/C=C\[C@@H]1[C@@H]2[C@@H](C[C@]1([C@H](CC)O2)[H])O |
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2-oxabicyclo[2.2.1]heptane(1−)
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SUBMITTER
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plasmodiophorol B
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UniProt
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Toporkova YY, Smirnova EO, Mukhtarova LS, Grechkin AN (2022) Lipoxygenase pathway in brown algae: The biosynthesis of novel oxylipins 'ectocarpins' by hydroperoxide bicyclase CYP5164A3 of Ectocarpus siliculosus. Biochimica et biophysica acta. Molecular and cell biology of lipids 1867, 159205 (Source: SUBMITTER) [PubMed:35835431] [show Abstract] The sequence encoding the CYP5164A3 of the brown alga Ectocarpus siliculosus (Stramenopiles, SAR) was heterologously expressed in E. coli cells. The resulting recombinant CYP74 clan-related protein CYP5164A3 possessed a selective activity towards the α-linolenic acid 13(S)-hydroperoxide (13-HPOTE) and eicosapentaenoic acid 15(S)-hydroperoxide (15-HPEPE). The major products were the heterobicyclic oxylipins. For instance, the 13-HPOTE was converted into plasmodiophorols A, B, and C formed at about 14:3:2 ratio. Plasmodiophorols A-C have been recently described as the products of enzyme hydroperoxide bicyclase CYP50918A1 of cercozoan Plasmodiophora brassicae (Rhizaria, SAR). Furthermore, an unknown compound 1 was detected. Purified product 1 (Me) was identified as a novel substituted 3-propenyl-6-oxabicyclo[3.1.0]hexane based on its MS and NMR spectral data. Conversion of 15-HPEPE by CYP5164A3 resulted in products 7 and 8, analogous to plasmodiophorols A and B. This work uncovered the CYP5164A3 as the first hydroperoxide bicyclase in brown algae. Apparently, this enzyme plays a crucial role in the biosynthesis of heterobicyclic oxylipins like hybridalactone, ecklonilactones, and related natural products, widespread in brown algae. |
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