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Ethylenediaminetetraacetic acid

乙二胺四乙酸二钠盐二水合物

Company: Sigma-Aldrich
Catalog#: E4884
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Manganese Superoxide Dismutase Activity Assay in the Yeast Saccharomyces cerevisiae
Author:
Date:
2020-03-05
[Abstract]  Superoxide dismutases (SODs) act as a primary defence against reactive oxygen species (ROS) by converting superoxide anion radicals (O2-) into molecular oxygen (O2) and hydrogen peroxide (H2O2). Members of this enzyme family include CuZnSODs, MnSODs, FeSODs, and NiSODs, depending on the nature of the cofactor that is required for proper activity. Most eukaryotes, including yeast, possess CuZnSOD and MnSOD. This protocol aims at assessing the activity of the yeast Saccharomyces cerevisiae MnSOD Sod2p from cellular extracts using nitroblue tetrazolium staining. This method can be used to estimate the cellular bioavailability of Mn2+ as well as to evaluate the redox state of the cell. [摘要]  [摘要 ] 超氧化物歧化酶(SOD能)充当主防御针对反应性氧物质(ROS)通过转换的超氧阴离子自由基(O 2 - )为分子氧(O 2 )和过氧化氢(H 2 ? 2 )。这种酶的家庭成员包括CuZnSODs ,MnSODs ,FeSODs 和NiSODs ,这取决于是需要适当的活动辅助因子的性质。大多数真核生物,包括酵母,都具有CuZnSOD 和MnSOD 。该协议旨在评估酵母的活性 使用硝基蓝四唑染色法从细胞提取物中提取酿酒酵母MnSOD Sod2p 。该方法可用于估计Mn 2+ 的细胞生物利用度以及评估细胞的氧化还原状态。

[背景 ] 的SODs被定义为减少正常有氧代谢为氧气和过氧化氢期间形成的氧的有害自由基含金属的抗氧化剂酶。:这些酶是基于需要作为辅因子进行适当的酶活性的金属分类CuZnSODs ,MnSODs ,FeSODs ,和NiSODs 。在酿酒酵母中,有两个S OD :CuZn-Sod1p和Mn-Sod2p(Abreu和Cabelli ...

Transcytosis Assay for Transport of Glycosphingolipids across MDCK-II Cells
Author:
Date:
2018-10-20
[Abstract]  Absorption and secretion of peptide and protein cargoes across single-cell thick mucosal and endothelial barriers occurs by active endocytic and vesicular trafficking that connects one side of the epithelial or endothelial cell (the lumen) with the other (the serosa or blood). Assays that assess this pathway must robustly control for non-specific and passive solute flux through weak or damaged intercellular junctions that seal the epithelial or endothelial cells together. Here we describe an in vitro cell culture Transwell assay for transcytosis of therapeutic peptides linked covalently to various species of the glycosphingolipid GM1. We recently used this assay to develop technology that harnesses endogenous mechanism of lipid sorting across epithelial cell barriers to enable ... [摘要]  单细胞厚粘膜和内皮屏障上的肽和蛋白质货物的吸收和分泌通过活性内吞和囊泡运输发生,其连接上皮细胞或内皮细胞(管腔)的一侧与另一侧(浆膜或血液)。 评估该途径的测定必须通过弱的或受损的细胞间连接强有力地控制非特异性和被动的溶质通量,所述细胞间连接将上皮细胞或内皮细胞密封在一起。 在这里,我们描述了一种体外>细胞培养Transwell测定法,用于与各种鞘糖脂GM1共价连接的治疗性肽的转胞吞作用。 我们最近使用该测定开发了技术,该技术利用跨上皮细胞屏障的脂质分选的内源机制,以实现肽和蛋白质治疗剂的口服递送。

【背景】
大分子穿过覆盖粘膜表面的单细胞厚的上皮屏障和衬在供给心肌和脑的血管的紧密内皮屏障上的运输通过内吞过程发生,该内吞过程将这些极化细胞的一侧与另一侧连接。该过程称为转胞吞作用(Garcia-Castillo et al。>,2017)。通过受体介导的内吞作用和穿过消化道和呼吸道粘膜的囊泡运输的免疫球蛋白的吸收和分泌最着名的是这一过程。对转胞吞作用的兴趣也受到利用该途径在紧密上皮和内皮屏障上递送治疗性肽和蛋白质的潜力的刺激(Thuenauer 等人,>,2017)。

转胞吞作用是一种活跃的(ATP驱动的)过程。在一些情况下,通过细胞间紧密连接在细胞周围被动扩散可以发生大分子跨越紧密上皮和内皮屏障的转运(Fung ...

Analysis of Metals in Whole Cells, Thylakoids and Photosynthetic Protein Complexes in Synechocystis sp. PCC6803
Author:
Date:
2018-06-20
[Abstract]  Metals are essential in many biological processes, including oxygenic photosynthesis. Here we described a method to measure the metal pool in whole cells and thylakoids, including the bioactive pool in intact photosynthetic protein complexes in the model oxygenic cyanobacterium Synechocystis PCC6803. In the first part of the protocol, whole cells and thylakoid membranes are carefully prepared, in which the total metal concentrations are measured by inductively coupled plasma triple-quadrupole mass spectrometry (ICP-QQQ-MS). In the second part of the protocol, isolated thylakoids are solubilized to release the integral membrane proteins and the metal binding protein complexes. These intact photosynthetic protein complexes are subjected to size exclusion chromatography (SEC) and ... [摘要]  金属在许多生物过程中是必不可少的,包括含氧光合作用。 在这里我们描述了测量全细胞和类囊体中金属库的方法,包括模型含氧蓝藻PCH6803中完整光合蛋白复合体中的生物活性库。 在方案的第一部分中,仔细制备全细胞和类囊体膜,其中通过电感耦合等离子体三重四极杆质谱(ICP-MS / MS)测量总金属浓度。 在该方案的第二部分,分离的类囊体被溶解以释放完整的膜蛋白和金属结合蛋白复合物。 将这些完整的光合蛋白复合物进行尺寸排阻色谱(SEC),并通过ICP-MS / MS进行连接分析尺寸分离的复合物中的金属结合。

【背景】氧光合作用的过程需要金属,因为它们在光合电子传递链中作为辅因子和催化剂的基本功能。光合装置需要Fe-S簇,血红素桥Fe和非血红素Fe形式的铁(Fe),可溶性移动电子载体蛋白质质体蓝素中的铜(Cu),叶绿素中的镁(Mg), ...

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