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Proofreading01:43

Proofreading

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Overview
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DNA Replication02:40

DNA Replication

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication...
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The DNA Replication Fork01:02

The DNA Replication Fork

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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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Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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Proofreading01:31

Proofreading

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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
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アデノウイルスDNA複製のための2つの補完的な鎖特異の終端部位.

B Weingärtner, E L Winnacker, A Tolun

    Cell
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    この要約は機械生成です。

    この研究は,アデノウイルス2型DNAの両端が複製原点として機能することを明らかにしています. 放射能のラベル付けは,DNA複製の過程で,それぞれの端末で明確な鎖の関与を示した.

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    科学分野:

    • 分子生物学は分子生物学である.
    • ウイルス学 ウイルス学 ウイルス学
    • 遺伝学 遺伝学とは

    背景:

    • アデノウイルス2型のDNA複製は複雑なプロセスです.
    • ウイルスのDNA複製の起源と終了点を理解することは,ウイルスの伝播機構の解読に不可欠です.

    研究 の 目的:

    • DNA複製におけるアデノウイルス2型DNAの分子端の特定の役割を調査する.
    • 新しく合成されたDNA鎖の末端での分布を決定する.

    主な方法:

    • 3H-チミジン短パルスラベリングを使用して,特にラベル付けされたアデノウイルス2型DNAの準備.
    • ウイルスDNA分子の分離.
    • 液相ハイブリド化とゲル電泳による補完性鎖における放射能分布の決定.

    主要な成果:

    • ほぼすべての放射能は,右端のウイルス"h"鎖に局限していた.
    • ほとんどの放射能は,左端にあるウイルスの"l"鎖に限られていた.
    • DNAの両端で異なるラベリングパターンを示した.

    結論:

    • アデノウイルス2型DNAの左側と右側の分子端は,DNA複製の原点と終点として機能する.
    • この発見は,アデノウイルスDNAの双方向複製メカニズムについての洞察を提供します.