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関連する概念動画

Riboswitches01:56

Riboswitches

Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
Allosteric Regulation01:08

Allosteric Regulation

Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
Transduction01:16

Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...
Allosteric Proteins-ATCase01:19

Allosteric Proteins-ATCase

Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...

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関連する実験動画

Updated: May 8, 2026

Colorimetric Detection of Bacteria Using Litmus Test
10:05

Colorimetric Detection of Bacteria Using Litmus Test

Published on: September 17, 2016

完全に調整可能なDNAベースのスイッチは,重金属によって誘発されます.

Alessandro Porchetta1, Alexis Vallée-Bélisle, Kevin W Plaxco

  • 1Dipartimento di Scienze e Tecnologie Chimiche, University of Rome , Tor Vergata, Via della Ricerca Scientifica, 00133, Rome, Italy.

Journal of the American Chemical Society
|August 27, 2013
PubMed
まとめ

研究者らは,金属イオンによって制御されるDNA分子スイッチを設計した. これらのスイッチは,調節可能な応答を提供し,DNAベースのナノマシンを強化します.

科学分野:

  • バイオケミストリー バイオケミストリー
  • 分子生物学は分子生物学である.
  • ナノテクノロジー ナノテクノロジー

背景:

  • 分子スイッチは,生物学的プロセスを制御し,高度なナノマシンを開発するために不可欠です.
  • 既存の分子スイッチには,正確な制御と調節可能なダイナミックレンジが欠けていることが多い.

研究 の 目的:

  • DNAを用いたアロステリック制御可能な金属イオン誘発分子スイッチを合理的に設計する.
  • DNAベースのナノマシンにおける機能向上のために,調節可能な応答を持つスイッチを設計する.

主な方法:

  • 設計されたDNA配列は,2つの低エネルギー構造を採用しています: 1つは非結合性であり,もう1つは金属イオン認識のための不一致部位を持っています.
  • ホモトロプ的アロステリック (協同) 反応を達成するために,複数の金属結合部位を組み込みました.
  • 非結合状態を安定化または不安定化するために,異性型アロステリックエフェクタとして単一鎖DNA配列を利用した.

主要な成果:

  • 金属イオン誘発分子スイッチとして作用するDNA配列の成功した設計を実証した.
  • 不一致サイトを通じて,水銀 (II) または銀 (I) イオンの特定の認識を達成しました.
  • 調節可能なダイナミックレンジをアロステリックエフェクターを使用して数桁の大きさで示した.

さらに関連する動画

Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters
09:22

Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters

Published on: November 26, 2013

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

関連する実験動画

Last Updated: May 8, 2026

Colorimetric Detection of Bacteria Using Litmus Test
10:05

Colorimetric Detection of Bacteria Using Litmus Test

Published on: September 17, 2016

Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters
09:22

Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters

Published on: November 26, 2013

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

結論:

  • アロステリック制御可能なDNA分子スイッチの合理的な設計は実現可能である.
  • これらの金属イオン誘発スイッチは,調節可能な応答を提供し,DNAベースのナノマシンを前進させます.
  • 開発されたアプローチは,DNAベースのナノデバイスの機能を強化するための貴重なツールを提供します.