Regulation of TG accumulation and lipid droplet morphology by the novel TLDP1 in Aurantiochytrium limacinum F26-b

Takashi Watanabe, Ryo Sakiyama, Yuya Iimi, Satomi Sekine, Eriko Abe, Kazuko H. Nomura, Kazuya Nomura, Yohei Ishibashi, Nozomu Okino, Masahiro Hayashi, Makoto Ito

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Thraustochytrids are marine single-cell protists that produce large amounts of PUFAs, such as DHA. They accumulate PUFAs in lipid droplets (LDs), mainly as constituent(s) of triacylglycerol (TG). We identified a novel protein in the LD fraction of Aurantiochytrium limacinum F26-b using 2D-difference gel electrophoresis. The protein clustered with orthologs of thraustochytrids; however, the cluster was evolutionally different from known PAT family proteins or plant LD protein; thus, we named it thraustochytrid-specific LD protein 1 (TLDP1). TLDP1 surrounded LDs when expressed as a GFP-tagged form. Disruption of the tldp1 gene decreased the content of TG and number of LDs per cell; however, irregular and unusually large LDs were generated in tldp1-deficient mutants. Although the level of TG synthesis was unchanged by the disruption of tldp1, the level of TG degradation was higher in tldp1-deficient mutants than in the WT. These phenotypic abnormalities in tldp1-deficient mutants were restored by the expression of tldp1. These results indicate that TLDP1 is a thraustochytrid-specific LD protein and regulates the TG accumulation and LD morphology in A. limacinum F26-b.—Watanabe, T., R. Sakiyama, Y. Iimi, S. Sekine, E. Abe, K. H. Nomura, K. Nomura, Y. Ishibashi, N. Okino, M. Hayashi, and M. Ito. Regulation of TG accumulation and lipid droplet morphology by the novel TLDP1 in Aurantiochytrium limacinum F26-b.

元の言語英語
ページ(範囲)2334-2347
ページ数14
ジャーナルJournal of Lipid Research
58
発行部数12
DOI
出版物ステータス出版済み - 2017

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Endocrinology
  • Cell Biology

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    Watanabe, T., Sakiyama, R., Iimi, Y., Sekine, S., Abe, E., Nomura, K. H., Nomura, K., Ishibashi, Y., Okino, N., Hayashi, M., & Ito, M. (2017). Regulation of TG accumulation and lipid droplet morphology by the novel TLDP1 in Aurantiochytrium limacinum F26-b. Journal of Lipid Research, 58(12), 2334-2347. https://doi.org/10.1194/jlr.M079897