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β-Nicotinamide adenine dinucleotide sodium salt

Company: Sigma-Aldrich
Catalog#: N0632
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Two Different Methods of Quantification of Oxidized Nicotinamide Adenine Dinucleotide (NAD+) and Reduced Nicotinamide Adenine Dinucleotide (NADH) Intracellular Levels: Enzymatic Coupled Cycling Assay and Ultra-performance Liquid Chromatography (UPLC)-Mass Spectrometry
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Date:
2018-07-20
[Abstract]  Current studies on the age-related development of metabolic dysfunction and frailty are each day in more evidence. It is known, as aging progresses, nicotinamide adenine dinucleotide (NAD+) levels decrease in an expected physiological process. Recent studies have shown that a reduction in NAD+ is a key factor for the development of age-associated metabolic decline. Increased NAD+ levels in vivo results in activation of pro-longevity and health span-related factors. Also, it improves several physiological and metabolic parameters of aging, including muscle function, exercise capacity, glucose tolerance, and cardiac function in mouse models of natural and accelerated aging.

Given the importance of monitoring cellular NAD+ and ...
[摘要]  目前关于代谢功能障碍和虚弱的年龄相关发展的研究每天都有更多的证据。众所周知,随着衰老的进展,烟酰胺腺嘌呤二核苷酸(NAD + )水平在预期的生理过程中降低。最近的研究表明,NAD + 的减少是与年龄相关的代谢衰退发展的关键因素。增加NAD + 水平体内导致激活寿命和健康跨度相关因素。此外,它改善了老化的几个生理和代谢参数,包括自然和加速老化的小鼠模型中的肌肉功能,运动能力,葡萄糖耐量和心脏功能。

鉴于监测细胞NAD + 和NADH水平的重要性,有一个值得信赖的方法是至关重要的。该方案的目的是在有效且广泛适用的测定中描述来自组织和细胞的NAD + 和NADH提取以及其图形和定量分析。

【背景】氧化烟酰胺腺嘌呤二核苷酸和还原型烟酰胺腺嘌呤二核苷酸(NAD + 和NADH)是重要的生物辅助因子,它们在几种合成代谢和分解代谢功能中提供和接受电子。它们参与诸如糖酵解,三羧酸循环和氧化磷酸化的反应。此外,它还作为DNA损伤修复中涉及的几种酶的底物,例如sirtuins和poly(ADP-核糖)聚合酶(PARP)(Imai和Guarente,2014; Verdin,2015; Yoshino et al。 ,2018)。

NAD + ...

Quantitative Determination of Poly-β-hydroxybutyrate in Synechocystis sp. PCC 6803
Author:
Date:
2017-07-20
[Abstract]  Cyanobacteria synthesize a variety of chemically-different, high-value biopolymers such as glycogen (polyglucose), poly-β-hydroxybutyrate (PHB), cyanophycin (polyamide of arginine and aspartic acid) and volutin (polyphosphate) under excess conditions. Especially under unbalanced C to N ratios, glycogen and in some cyanobacterial genera also PHB are massively accumulated in the progression of the general nitrogen stress response. Several different technologies have been established for in situ and in vitro PHB analysis from different microbial sources. In this protocol, a rapid and reliable spectrophotometric method is described for PHB quantification in the cyanobacterium Synechocystis sp. PCC 6803 upon nitrogen deprivation as described in (Damrow et ... [摘要]  蓝细菌合成各种化学上不同的高价值生物聚合物,如糖原(polyglucose),poly-β-β-羟基丁酸酯(PHB),蓝藻素(精氨酸和天冬氨酸的聚酰胺)和挥发物(多磷酸盐) 在超额条件下。 特别是在不平衡的C至N比下,糖原和一些蓝藻属中,PHB在一般氮应激反应进程中大量积累。 已经针对不同微生物来源的原位实验和/或从体外分析,建立了几种不同的技术。 在该协议中,描述了用于蓝藻(Stechocystis)的PHB定量的快速可靠的分光光度法。 如(Damrow等人,2016)中描述的氮缺乏的PCC 6803。
【背景】非重氮营养蓝细菌,例如集胞藻(Synechocystis) PCC 6803通过漂白来解决缺乏组合的氮源,这是一种被称为褪绿的过程(Allen和Smith,1969)。这种驯化反应的特征在于四个主要的结构和形态变化:(i)类囊体层之间的电子致密糖原夹杂物(直径约40nm)的大量积累伴随着(ii)藻糖酵母天线复合物的降解, (iii)类囊体膜层的拆卸,包括数量减少和包装密度,和(iv)形成不同的电子透明PHB颗粒(直径约400-500nm)(Damrow等人,2016)。由于不存在分解代谢酶和PHB缺陷型突变体的明显表型,所以在几种物种中合成的蓝细菌PHB代谢的生理功能是相当不透明的(Beck等人,2012; van ,2010; Damrow等人,2016; ...

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