{{'Search' | translate}}
 

96-well microplate, black, clear bottom with lid

96孔平底清漆黑色聚苯乙烯TC微孔板

Company: Corning
Catalog#: 3603
Bio-protocol()
Company-protocol()
Other protocol()

Ubiquitin Proteasome Activity Measurement in Total Plant Extracts
Author:
Date:
2017-09-05
[Abstract]  The fine-tuned balance of protein level, conformation and location within the cell is vital for the dynamic changes required for a cell to respond to a given stimulus. This requires the regulated turnover of damaged or short-lived proteins through the ubiquitin proteasome system (UPS). Thus, the protease activity of the proteasome is adjusted to meet the current demands of protein degradation via the UPS within the cell. We describe the adaptation of an intramolecular quenched fluorescence assay utilizing substrate-mimic peptides for the measurement of proteasome activity in total plant extracts. The peptide substrates contain donor-quencher pairs that flank the scissile bond. Following cleavage, the increase in dequenched donor emission of the product is subsequently measured over time ... [摘要]  细胞内的蛋白质水平,构象和位置的微调平衡对于细胞对给定刺激作出反应所需的动态变化是至关重要的。 这需要通过泛素蛋白酶体系统(UPS)调节受损或短寿命蛋白质的周转。 因此,调节蛋白酶体的蛋白酶活性以满足目前通过细胞内的UPS的蛋白质降解的需求。 我们描述了使用底物 - 模拟肽进行分子内淬灭荧光测定来测定总植物提取物中蛋白酶体活性的适应性。 肽底物含有侧向于剪切键的供体 - 猝灭剂对。 切割后,随后随时测量产物的去质子供体发射的增加,并用于计算相对蛋白酶体活性。
【背景】泛素蛋白酶体系统(UPS)是真核细胞中主要的蛋白质降解机制,因此,UPS对许多细胞过程的调节至关重要,包括信号传导,细胞周期,囊泡运输和免疫。用于营业额的蛋白质通过泛素的共价连接标记,然后被26S蛋白酶体降解。 26S蛋白酶体由两个亚颗粒组成,即20S核心蛋白酶(CP),其分隔蛋白酶活性位点和19S调节颗粒,其将适当的底物识别并转移到CP腔中进行分解。调节蛋白酶体活性以维持蛋白酶抑制以响应内部和外部条件的波动。我们最近显示,UPS涉及植物免疫的几个方面,一系列植物和动物病原体颠覆了UPS来增强其毒力(Üstünet al。,2013;üstünet al。,2014;ÜstünandBörnke,2015 ;Üstünet ...

Metabolic Assays for Detection of Neutral Fat Stores
Author:
Date:
2015-06-20
[Abstract]  Lipid droplets (LDs) are ubiquitous intracellular structures whose formation, growth, and maintenance are highly regulated (Wang et al., 2013; Ranall et al., 2011; Goodman, 2009). Lipid metabolism and droplet dynamics are of considerable interest to agriculture, biofuel production, viral pathology, nutrition, and cancer biology (Walther and Farese, 2009; Liu et al., 2010). Accumulation of fatty acids and neutral lipids in nonadipose tissues is cytotoxic (Kourtidis et al., 2009). BODIPY 493/503 (4,4-Difluoro-1,3,5,7,8-Pentamethyl-4-Bora-3a,4a-Diaza-s-Indacene) is the standard dye to study LDs within adipocytes. BODIPY 493/503 contains a nonpolar structure that, upon binding to neutral lipid, emits a green fluorescence signal with a narrow wavelength ... [摘要]  脂质滴(LD)是普遍存在的细胞内结构,其形成,生长和维持是高度调节的(Wang等人,2013; Ranall等人,2011; Goodman, 2009)。脂质代谢和液滴动力学对农业,生物燃料生产,病毒病理学,营养和癌症生物学是相当感兴趣的(Walther和Farese,2009; Liu等人,2010)。在非脂肪组织中脂肪酸和中性脂质的积累是细胞毒性的(Kourtidis等人,2009)。 BODIPY 493/503(4,4-二氟-1,3,5,7,8-五甲基-4-Bora-​​3a,4a-Diaza-s-Indacene)是研究脂肪细胞内LD的标准染料。 BODIPY 493/503含有非极性结构,在结合中性脂质时,发射具有窄波长范围的绿色荧光信号,使其成为用于多标记实验的理想荧光团。染料分子的疏水性质促进快速进入LD的非极性环境(Listenberge和Brown,2007)。 Gocze和Freeman显示,当使用BODIPY493/503与Nile Red相比时,脂质荧光变异性显着降低,表明其可能对LD更具特异性(Gocze和Freeman,1994)。在这里,我们描述了BODIPY 493/503测定用于检测培养的细胞中的神经脂肪储存(图1)(Wang等人,2013)。

Proteasome Assay in Cell Lysates
Author:
Date:
2014-01-20
[Abstract]  The ubiquitin-proteasome system (UPS) mediates the majority of the proteolysis seen in the cytoplasm and nucleus of mammalian cells. As such it plays an important role in the regulation of a variety of physiological and pathophysiological processes including tumorigenesis, inflammation and cell death (Ciechanover, 2005; Kisselev and Goldberg, 2001). A number of recent studies have shown that proteasome activity is decreased in a variety of neurological disorders including Parkinson's disease, Alzheimer's disease, amyotrophic lateral sclerosis and stroke as well as during normal aging (Chung et al., 2001; Ciechanover and Brundin, 2003; Betarbet et al., 2005). This decrease in proteasome activity is thought to play a critical role in the accumulation of abnormal and ... [摘要]  泛素 - 蛋白酶体系统(UPS)介导哺乳动物细胞的细胞质和细胞核中大部分蛋白水解。因此,它在调节各种生理和病理生理过程中起重要作用,包括肿瘤发生,炎症和细胞死亡(Ciechanover,2005; Kisselev和Goldberg,2001)。许多最近的研究表明,在多种神经障碍(包括帕金森病,阿尔茨海默病,肌萎缩性侧索硬化和中风)以及正常衰老期间,蛋白酶体活性降低(Chung等,2001; Ciechanover和Brundin,2003; Betarbet等,2005)。蛋白酶体活性的降低被认为在异常和氧化蛋白质的积累中发挥关键作用。 UPS的蛋白质清除涉及两个连续的反应。第一个是用泛素(Ub)标记蛋白质赖氨酸残基,第二个是蛋白酶体随后降解标记的蛋白质。我们本文描述了这两个反应中第二个的测定(Valera等,2013)。该测定法使用荧光底物作为蛋白酶体的三种活性:糜蛋白酶样活性,胰蛋白酶样活性和半胱天冬酶样活性。通过蛋白酶体从底物中切割荧光团可导致可用荧光板读数器检测的荧光。

Comments