首页> 美国卫生研究院文献>Biomolecules >Study of Synthesis Pathways of the Essential Polyunsaturated Fatty Acid 20:5n-3 in the Diatom Chaetoceros Muelleri Using 13C-Isotope Labeling
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Study of Synthesis Pathways of the Essential Polyunsaturated Fatty Acid 20:5n-3 in the Diatom Chaetoceros Muelleri Using 13C-Isotope Labeling

机译:用13C同位素标记研究硅藻Chaelleroceros Muelleri中必需多不饱和脂肪酸20:5n-3的合成途径

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摘要

The present study sought to characterize the synthesis pathways producing the essential polyunsaturated fatty acid (PUFA) 20:5n-3 (EPA). For this, the incorporation of C was experimentally monitored into 10 fatty acids (FA) during the growth of the diatom for 24 h. preferentially and quickly incorporated C into C PUFAs such as 18:2n-6 and 18:3n-6 as well as 16:0 and 16:1n-7, which were thus highly C-enriched. During the experiment, 20:5n-3 and 16:3n-4 were among the least-enriched fatty acids. The calculation of the enrichment percentage ratio of a fatty acid B over its suspected precursor A allowed us to suggest that the diatom produced 20:5n-3 (EPA) by a combination between the n-3 (via 18:4n-3) and n-6 (via 18:3n-6 and 20:4n-6) synthesis pathways as well as the alternative ω-3 desaturase pathway (via 20:4n-6). In addition, as FA from polar lipids were generally more enriched in C than FA from neutral lipids, particularly for 18:1n-9, 18:2n-6 and 18:3n-6, the existence of acyl-editing mechanisms and connectivity between polar and neutral lipid fatty acid pools were also hypothesized. Because 16:3n-4 and 20:5n-3 presented the same concentration and enrichment dynamics, a structural and metabolic link was proposed between these two PUFAs in .
机译:本研究试图表征产生必需多不饱和脂肪酸(PUFA)20:5n-3(EPA)的合成途径。为此,在硅藻生长24小时的过程中,通过实验监测了C在10种脂肪酸(FA)中的掺入情况。优先快速地将C掺入C PUFA中,例如18:2n-6和18:3n-6以及16:0和16:1n-7,这些C PUFA中的C含量很高。在实验过程中,20:5n-3和16:3n-4是最不富含脂肪酸的脂肪酸。通过计算脂肪酸B与其可疑前体A的富集百分比,我们可以得出结论,硅藻通过n-3(通过18:4n-3)与n-3(通过结合)的结合产生20:5n-3(EPA)。 n-6(通过18:3n-6和20:4n-6)合成途径以及替代的ω-3去饱和酶途径(通过20:4n-6)。此外,由于极性脂质中的FA通常比中性脂质中的FA更富集C,特别是对于18:1n-9、18:2n-6和18:3n-6,酰基编辑机制的存在以及它们之间的连通性还假设了极性和中性脂质脂肪酸库。由于16:3n-4和20:5n-3呈现相同的浓度和富集动力学,因此在这两个PUFA之间提出了结构和代谢联系。

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