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関連する概念動画

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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関連する実験動画

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

ソービングは溶液中のメット・リプレッサー・オペレータの認識に成功しました.

Y Y He1, T McNally, I Manfield

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

Nature
|October 1, 1992
PubMed
まとめ
この要約は機械生成です。

Escherichia coliのメチオニン抑制剤 (MetJ) は,DNA認識のためにベータリボンコンタクトを使用しています. アルファヘリクスを通したダイマー-ダイマー相互作用は,MetJ抑制に不可欠であり,そのDNA-タンパク質相互作用メカニズムを確認します.

さらに関連する動画

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

関連する実験動画

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

科学分野:

  • 構造生物学 構造生物学とは
  • 分子遺伝学 分子遺伝学
  • バイオケミストリー バイオケミストリー

背景:

  • エシェリキア大腸菌のメチオニン抑制剤 (MetJ) は,メチオニン生物合成遺伝子を調節する.
  • DNAとタンパク質の相互作用を理解することは,遺伝子調節の鍵です.
  • 以前のモデルは,MetJ-DNA結合メカニズムを仮説化した.

研究 の 目的:

  • MetJ-DNA結合における特定の構造特性の役割を調査する.
  • MetJによるDNA配列認識のメカニズムを解明する.
  • MetJ機能におけるディマー-ディマー相互作用の重要性を評価する.

主な方法:

  • MetJ-DNA複合体の3次元結晶構造分析.
  • サイト指向型変異は,タンパク質-DNAおよびタンパク質-タンパク質の接触を妨げます.
  • 変異したMetJタンパク質における抑制効率の評価.

主要な成果:

  • DNA配列認識は,ベータリボンモチーフでDNA塩基とアミノ酸サイドチェーン間の水素結合によって主に媒介されます.
  • アンチパラレルアルファヘリクスは,隣接するDNA部位に結合したMetJ抑制体間の二次二次接触を媒介する.
  • 変異分析は,認知におけるβ鎖モチーフの役割を確認し,効果的な抑圧のための二次二次相互作用の必要性を強調しました.

結論:

  • MetJは,直接的なDNA配列認識のためのβリボンを使用しており,これは新しい相互作用モードです.
  • アルファヘリクスが媒介するディマー-ディマー相互作用は,MetJの抑制機能に不可欠である.
  • カーボキシ・ターミナル・ヘリックス・フェイスは,オペレーター・バインディングにおいて重要な役割を果たさない.