Department of Biochemistry & Cell and Molecular Biology, University of Tennessee, Knoxville, Tennessee, USA.
Bioessays. 2022 Sep;44(9):e2200038. doi: 10.1002/bies.202200038. Epub 2022 Jul 13.
Lipid droplets (LDs) are ubiquitous, neutral lipid storage organelles that act as hubs of metabolic processes. LDs are structurally unique with a hydrophobic core that mainly consists of neutral lipids, sterol esters, and triglycerides, enclosed within a phospholipid monolayer. Nascent LD formation begins with the accumulation of neutral lipids in the endoplasmic reticulum (ER) bilayer. The ER membrane proteins such as seipin, LDAF1, FIT, and MCTPs are reported to play an important role in the formation of nascent LDs. As the LDs grow, they unmix from the highly charged ER membrane to form mature LDs. LD biogenesis is an exciting, emerging research area, and herein, we discuss the recent progress in our understanding of the formation of eukaryotic nascent LDs. We focus on the role of ER membrane shaping proteins such as reticulons and reticulon-like proteins, membrane lipids, and cytoskeleton proteins such as septin in the formation of nascent LDs.
脂滴(LDs)是普遍存在的中性脂质储存细胞器,作为代谢过程的中心。LDs 具有独特的结构,其疏水核心主要由中性脂质、甾醇酯和甘油三酯组成,被磷脂单层包围。新形成的 LD 形成始于内质网(ER)双层中中性脂质的积累。报道称 ER 膜蛋白,如 seipin、LDAF1、FIT 和 MCTPs,在新形成的 LD 的形成中发挥重要作用。随着 LD 的生长,它们从带高电荷的 ER 膜中分离出来形成成熟的 LD。LD 发生是一个令人兴奋的新兴研究领域,本文我们讨论了我们对真核新生 LD 形成的理解的最新进展。我们专注于 ER 膜成形蛋白(如 reticulons 和 reticulon-like 蛋白)、膜脂质以及细胞骨架蛋白(如 septin)在新生 LD 形成中的作用。
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