Purification, cellular levels, and functional domains of lipase maturation factor 1.

Purification, cellular levels, and functional domains of lipase maturation factor 1.
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脂肪酶成熟因子 1 的纯化、细胞水平和功能域。

DOI:
10.1016/j.bbrc.2014.05.136
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发表时间:
2014
影响因子:
3.1
通讯作者:
Neher,SaskiaB
Neher,SaskiaB
中科院分区:
生物学4区
文献类型:
--
作者:
Babilonia-Rosa,MelissaA;Neher,SaskiaB

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超过三分之一的美国成年人患有高甘油三酯血症,导致动脉粥样硬化、胰腺炎和代谢综合征的风险增加。脂蛋白脂肪酶(LPL)是一种二聚体酶,是负责食物摄入后从血液中清除TG的主要脂肪酶。LPL需要一个内质网(ER)驻留,跨膜蛋白称为脂肪酶成熟因子1(LMF 1)的分泌和酶活性。LMF 1被认为是二聚体脂肪酶的客户端特异性伴侣,但LMF 1功能的确切机制尚不清楚。在这里,我们研究哪些领域的LMF 1有助于二聚体脂肪酶成熟评估截断变体的功能。LMF 1的N-末端截短表明所有结构域对于LPL成熟都是必需的。荧光显微镜和蛋白酶保护测定证实,这些变体在ER中正确定向。我们测量了LMF 1的细胞水平,发现它以低水平表达,每个LMF 1分子促进50个或更多LPL分子的成熟。因此,我们提供的证据LMF 1的N-末端的LPL的成熟和相关的伴侣底物的比例的关键作用。
Over a third of the US adult population has hypertriglyceridemia, resulting in an increased risk of atherosclerosis, pancreatitis, and metabolic syndrome. Lipoprotein lipase (LPL), a dimeric enzyme, is the main lipase responsible for TG clearance from the blood after food intake. LPL requires an endoplasmic reticulum (ER)-resident, transmembrane protein known as lipase maturation factor 1 (LMF1) for secretion and enzymatic activity. LMF1 is believed to act as a client specific chaperone for dimeric lipases, but the precise mechanism by which LMF1 functions is not understood. Here, we examine which domains of LMF1 contribute to dimeric lipase maturation by assessing the function of truncation variants. N-terminal truncations of LMF1 show that all the domains are necessary for LPL maturation. Fluorescence microscopy and protease protection assays confirmed that these variants were properly oriented in the ER. We measured cellular levels of LMF1 and found that it is expressed at low levels and each molecule of LMF1 promotes the maturation of 50 or more molecules of LPL. Thus we provide evidence for the critical role of the N-terminus of LMF1 for the maturation of LPL and relevant ratio of chaperone to substrate.
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