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Amicon Ultra-4 Centrifugal Filter Unit with Ultracel-10 membrane

Amicon Ultra-4 Centrifugal Filter Unit with Ultracel-10 membrane

Company: EMD Millipore
Catalog#: UFC801096
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Thermal Stability of Heterotrimeric pMHC Proteins as Determined by Circular Dichroism Spectroscopy
Author:
Date:
2017-07-05
[Abstract]  T cell receptor (TCR) recognition of foreign peptide fragments, presented by peptide major histocompatibility complex (pMHC), governs T-cell mediated protection against pathogens and cancer. Many factors govern T-cell sensitivity, including the affinity of the TCR-pMHC interaction and the stability of pMHC on the surface of antigen presenting cells. These factors are particularly relevant for the peptide vaccination field, in which more stable pMHC interactions could enable more effective protection against disease. Here, we discuss a method for the determination of pMHC stability that we have used to investigate HIV immune escape, T-cell sensitivity to cancer antigens and mechanisms leading to autoimmunity. [摘要]  由肽主要组织相容性复合物(pMHC)提供的外源肽片段的T细胞受体(TCR)识别控制T细胞介导的针对病原体和癌症的保护。 许多因素控制T细胞敏感性,包括TCR-pMHC相互作用的亲和力和pMHC在抗原呈递细胞表面的稳定性。 这些因素对于肽疫苗接种领域尤其重要,其中更稳定的pMHC相互作用可以实现更有效的防止疾病的保护。 在这里,我们讨论一种测定pMHC稳定性的方法,我们已经用来调查HIV免疫逃逸,T细胞对癌症抗原的敏感性和导致自身免疫的机制。
【背景】CD8 + T细胞对外来入侵者或失调自身的反应的能力取决于细胞表面上稳定的pMHC I类(pMHCI)表达。在结构上,MHCI分子在α1和α2结构域之间的界面处形成由两个平行的α螺旋形成的肽结合槽,其具有β片的底部(Latron等人,1992)。肽结合槽具有与结合肽的N-和C-末端紧密相互作用的特异性氨基酸的主要肽结合口袋(B和F)。虽然这些口袋可以适应一系列氨基酸,但它们表现出对使用结构和生物化学方法表征的某些侧链的偏好(Parker等人,1992)。该信息已被用于产生所谓的“异型”肽,其中具有差的MHC锚的天然肽可以用与MHC最佳结合的氨基酸进行修饰(Cole等人,2010 ...

Plant Endo-β-mannanase Activity Assay
Author:
Date:
2013-09-05
[Abstract]  Endo-β–mannanases in plant require post-translational modification, such as N-glycosylation and disulfide-linked dimerization, for their catalytic activity. Determination of the plant endo-β–mannanase activity needs to modify the assay conditions for optimizing their enzymatic reaction. Here, we describe a modified method for plant endo-β–mannanase assay. A high-salt buffer without thiol reductants is required for effective extraction of the enzyme. The enzyme is able to digest water-insoluble AZCL galactomannan to release water soluble dyed fragments, which is detected through measurement of absorbance at 590 nm wavelength. Increase in absorbance at 590 nm is correlated directly with enzyme activity.
[摘要]  对于其催化活性,植物中的内切-β-甘露聚糖酶需要翻译后修饰,例如N-糖基化和二硫键连接的二聚化。 植物内切-β-甘露聚糖酶活性的测定需要改变测定条件以优化它们的酶反应。 在这里,我们描述了植物内切-β-甘露聚糖酶测定的修改方法。 为了有效地提取酶,需要没有硫醇还原剂的高盐缓冲液。 该酶能够消化水不溶性AZCL半乳甘露聚糖以释放水溶性染色片段,其通过测量在590nm波长处的吸光度来检测。 在590nm处的吸光度的增加与酶活性直接相关

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