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Glass Hamilton syringe

Company: Hamilton
Catalog#: 81365
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In vitro Measurement of CMP-Sialic Acid Transporter Activity in Reconstituted Proteoliposomes
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Date:
2020-03-20
[Abstract]  Nucleotide-sugar transporters (NSTs) facilitate eukaryotic cellular glycosylation by transporting nucleotide-sugar conjugates into the Golgi lumen and endoplasmic reticulum for use by glycosyltransferases, while also transferring nucleotide monophosphate byproducts to the cytoplasm. Mutations in this family of proteins can cause a number of significant cellular pathologies, and wild type members can act as virulence factors for many parasites and fungi. Here, we describe an in vitro assay to measure the transport activity of the CMP-sialic acid transporter (CST), one of seven NSTs found in mammals. While in vitro transport assays have been previously described for CST, these studies failed to account for the fact that 1) commercially available stocks of CMP-sialic acid ... [摘要]  [ 摘要] 核苷酸糖转运蛋白(NST)通过将核苷酸糖结合物转运到高尔基腔和内质网供糖基转移酶使用,同时将核苷酸单磷酸副产物转移到细胞质中,从而促进了真核细胞的糖基化。该蛋白质家族的突变可引起许多重要的细胞病理,野生型成员可充当许多寄生虫和真菌的致病因子。在这里,我们描述了一种体外测定法,以测量CMP-唾液酸转运蛋白(CST)的转运活性,CMP-唾液酸转运蛋白(CST)是在哺乳动物中发现的七个NST之一。虽然在体外 以前已经针对CST进行了转运分析,但这些研究未能说明以下事实:1 )CMP- 唾液酸(CMP-Sia )的商业库存由约10%的高亲和力CMP组成,以及2)CMP- SIA 是水解d 到CMP和在水溶液中的唾液酸。在这里,我们描述了一种用非选择性磷酸酶南极磷酸酶治疗CMP-Sia的方法,以将所有游离CMP转化为胞苷。这使我们能够准确地测量重组为蛋白脂质体的纯化CST的底物亲和力和运输动力学。

[ 背景技术]一旦在细胞质或细胞核合成,核苷酸偶联的糖被输送到内质网的内腔(ER)由核苷酸-糖转运蛋白(NSTS)或高尔基体(青木等人,2003)。在这些亚细胞区室中,糖基转移酶利用糖部分糖基化脂质和蛋白质,产生副产物核苷酸单磷酸酯(NMP)(Capasso和Hirschberg,1984 ;Milla和Hirschberg ,1989; ...

Assay to Measure Interactions between Purified Drp1 and Synthetic Liposomes
Author:
Date:
2017-05-05
[Abstract]  A mitochondrion is a dynamic intracellular organelle that actively divides and fuses to control its size, number and shape in cells. A regulated balance between mitochondrial division and fusion is fundamental to the function, distribution and turnover of mitochondria (Roy et al., 2015). Mitochondrial division is mediated by dynamin-related protein 1 (Drp1), a mechano-chemical GTPase that constricts mitochondrial membranes (Tamura et al., 2011). Mitochondrial membrane lipids such as phosphatidic acid and cardiolipin bind Drp1, and Drp1-phospholipid interactions provide key regulatory mechanisms for mitochondrial division (Montessuit et al., 2010; Bustillo-Zabalbeitia et al., 2014; Macdonald et al., 2014; Stepanyants et al., 2015; ... [摘要]  线粒体是一种动态的细胞内细胞器,主动分裂和融合以控制细胞的大小,数量和形状。线粒体分裂和融合之间的调节平衡是线粒体功能,分布和周转的基础(Roy等,2015)。线粒体分化是由动力蛋白相关蛋白1(Drp1)介导的,其是限制线粒体膜的机械化学GTP酶(Tamura等人,2011)。线粒体膜脂质如磷脂酸和心磷脂结合Drp1,并且Drp1磷脂相互作用提供线粒体分裂的关键调控机制(Montessuit等人,2010; Bustillo-Zabalbeitia等人2014年; Macdonald等人,2014年; Stepanyants等人,2015; Adachi等人,2016)。在这里,我们描述了使用纯化的重组Drp1和具有定义的一组磷脂的合成脂质体定量测量Drp1与脂质的相互作用的生物化学实验。该测定使得可以定义蛋白质 - 脂质相互作用的特异性以及头基和酰基链的作用。

背景 蛋白质和膜脂质的相互作用对于细胞如细胞器分裂中生物膜的重塑至关重要。在线粒体分裂中,Drp1限制线粒体膜并驱动该膜重塑过程。我们最近显示,信号磷脂,磷脂酸与Drp1相互作用,并通过限制线粒体上的组装分裂机制(Adachi等人,2016)产生启动步骤。 Drp1识别磷脂酸的头基和酰基链。为了分析Drp1-磷脂酸结合,我们建立了几种蛋白质 - ...

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