相关实验视频
Updated: Jan 21, 2026

07:46
An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
Published on: October 8, 2018
7.4K
亚斯巴酸盐残留物远离活性部位驱动O-GlcNAc转移酶基质选择
Cassandra M Joiner1, Zebulon G Levine1, Chanat Aonbangkhen2
1Department of Microbiology , Harvard Medical School , 4 Blackfan Circle , Boston , Massachusetts 02115 , United States.
Journal of the American Chemical Society
|August 3, 2019
概括
研究人员在O-GlcNAc转移酶 (OGT) 中发现了关键的酸盐残留物,这些残留物控制着它修饰的蛋白质. 这一发现影响了对细胞过程和疾病中的O-GlcNAc调节的理解.
科学领域:
- 生物化学
- 分子生物学
- 细胞生物学
背景情况:
- O-GlcNAc是一个关键的翻译后修饰,调节许多细胞过程.
- 较高的O-GlcNAc水平与癌症的进展有关.
- O-GlcNAc转移酶 (OGT) 是唯一负责核细胞质O-GlcNAcylation的酶.
研究的目的:
- 阐明OGT酶选择基质的机制.
- 在OGT中识别特定的残留物,这些残留物决定了基质的特异性.
- 了解OGT的结构如何影响蛋白质糖化.
主要方法:
- 使用蛋白质微阵列技术进行高通量选.
- 进行全蛋白质组的糖化分析.
- 采用位点定向的突变生成来改变OGT的TPR域中的保存酸盐残留物.
主要成果:
- 在OGT的四重复 (TPR) 光中确定了保存的酸盐残留物,对基质选择至关重要.
- 证明将这些酸盐残留物转化为氨酸会改变OGT的基质选择性.
- 在这些残留物突变时,蛋白质糖化率出现了意想不到的增加.
结论:
- 在OGT TPR领域保存的酸盐残留物是基质识别的关键驱动因素.
- 提出了一个模型,其中TPR域接触确定基板上的糖化位点.
- 这些发现为设计用于功能研究的OGT抑制剂和工程基质提供了基础.
相关概念视频
Residual Stresses
599
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
599
Residual Plots
6.2K
A residual plot is a statistical representation of data used to analyze correlation and regression results. It helps verify the requirements for drawing specific conclusions about correlation and regression. To obtain the residual plot, first, the residual for each data value is calculated, which is simply the vertical distance between the observed and the predicted value obtained from the regression equation.
When the residual values are plotted against the variable x, it is called a residual...
When the residual values are plotted against the variable x, it is called a residual...
6.2K
T Cell Activation and Clonal Selection
14.8K
T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Naive T cells that have not yet encountered an antigen express two primary CD...
14.8K
Energy to Drive Translocation
2.7K
Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
Generally, polypeptides are unfolded by two distinct...
2.7K
Residual Stresses in Circular Shafts
517
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
517
Residual Stresses in Bending
531
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
531

