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Single-Strand DNA Binding Proteins01:03

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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The DNA Helix01:16

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The DNA Helix01:07

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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
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Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers
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DNAデュプレックスを通してヘリックス依存スピンフィルタリング

Theodore J Zwang1, Sylvia Hürlimann1, Michael G Hill2

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.

Journal of the American Chemical Society
|December 10, 2016
PubMed
まとめ
この要約は機械生成です。

DNAの構造はスイッチのように作用し,電子はスピン選択的にDNAを通過します. DNAのハンドル性が変化すると どの電子のスピンがより効率的に動くのかが変化し,スピン輸送の洞察が明らかになる.

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科学分野:

  • 分子生物物理学
  • スピントロニクス
  • ナノテクノロジー

背景:

  • 新興の研究では DNAのようなキラル分子を介して スピン選択的な電子輸送が示されています
  • DNAにおけるこのスピン選択性を駆動する基本的メカニズムは ほとんど未知のままです
  • DNAのスピン輸送を理解することは,新しいスピントロニックデバイスの開発に不可欠です.

研究 の 目的:

  • 水性複合DNAによる電子輸送におけるスピン選択性の起源を調査する.
  • スピン依存の電子移動におけるDNAヘリシティと電荷輸送の役割を調査する.
  • DNAの超分子組織が スピンの選択性に 影響するかどうかを判断する

主な方法:

  • 磁気化DNA改変電極を用いた実験で 電子の移動を検知する.
  • スピン選択性電子輸送の分析は,水素化された二重複 DNA を介して得られます.
  • 右利きB-DNAと左利きZ-DNAの形状におけるスピン選択性の比較

主要な成果:

  • デュプレックスDNAを通した2つの電子スピンの差異的移動の収量を示した.
  • DNA複合体内で発生する電荷輸送に依存していることが確認されました.
  • DNAのB型とZ型との間でのスピン選択性のダイオードのような切り替えが観察され,DNAのヘリシティと直接相関しています.

結論:

  • DNAの螺旋性,特にその超分子組織は,電子輸送におけるスピン選択性を決定する.
  • DNAの形状の変化は 特定の電子スピンの好ましい経路を動的に切り替えることができます
  • DNAのスピン選択性は 個々のモノメアのキラリティではなく 全体の構造によって支配されます