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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Bioreactor Controls-I01:28

Bioreactor Controls-I

Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly monitored using...

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相关实验视频

Updated: Jun 29, 2026

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
10:27

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

Published on: June 12, 2019

探测器在溶液中遇到了压缩机-操作器识别.

Y Y He1, T McNally, I Manfield

  • 1Department of Genetics, University of Leeds, UK.

Nature
|October 1, 1992
PubMed
概括
此摘要是机器生成的。

大肠杆菌氨酸抑制剂 (MetJ) 使用β-带接触器进行DNA识别. 通过α螺旋体进行的二次二次相互作用对MetJ抑制至关重要,证实了其DNA-蛋白相互作用机制.

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Measurement of Spatial Stability in Precision Grip
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Measurement of Spatial Stability in Precision Grip

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Measurement of Compressive Stress-Strain Response at Small-Strains
02:58

Measurement of Compressive Stress-Strain Response at Small-Strains

Published on: December 5, 2025

相关实验视频

Last Updated: Jun 29, 2026

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
10:27

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

Published on: June 12, 2019

Measurement of Spatial Stability in Precision Grip
09:36

Measurement of Spatial Stability in Precision Grip

Published on: June 4, 2020

Measurement of Compressive Stress-Strain Response at Small-Strains
02:58

Measurement of Compressive Stress-Strain Response at Small-Strains

Published on: December 5, 2025

科学领域:

  • 结构生物学是结构生物学.
  • 分子遗传学 分子遗传学
  • 生物化学 生物化学

背景情况:

  • 大肠杆菌氨酸抑制剂 (MetJ) 调节氨酸生物合成基因.
  • 了解DNA-蛋白相互作用是基因调节的关键.
  • 之前的模型假设MetJ-DNA结合机制.

研究的目的:

  • 研究特定结构特征在MetJ-DNA结合中的作用.
  • 通过MetJ阐明DNA序列识别的机制.
  • 评估二元二元相互作用在MetJ函数中的重要性.

主要方法:

  • 对MetJ-DNA复合体的三维晶体结构分析.
  • 局部定向的突变发生,以破坏蛋白质-DNA和蛋白质-蛋白质接触.
  • 在突变的MetJ蛋白中抑制效率的评估.

主要成果:

  • DNA 序列的识别主要由DNA 基和氨基酸侧链之间的键介导,以β-带的形式.
  • 反平行阿尔法螺旋环介于与相邻DNA位点结合的MetJ抑制剂之间的二次二次接触.
  • 突变分析证实了β链基因在识别中的作用,并强调了有效抑制的二元二元相互作用的必要性.

结论:

  • MetJ使用β-带直接识别DNA序列,这是一种新的交互方式.
  • 由α-螺旋体介导的二元二元相互作用对于MetJ的抑制功能至关重要.
  • 碳氧终端螺旋面在操作员绑定中没有显著作用.