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Related Concept Videos

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.
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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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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.
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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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Translesion DNA Synthesis.

Alexandra Vaisman, John P McDonald, Roger Woodgate

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    |October 8, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Cells use Translesion DNA Synthesis (TLS) with specialized DNA polymerases to repair damaged DNA, ensuring genome duplication and survival. Escherichia coli utilizes pols II, IV, and V for most TLS processes.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • DNA damage is a constant threat to genome integrity.
    • Cells possess DNA repair enzymes, but persistent lesions can block replication.
    • Translesion DNA Synthesis (TLS) is a critical pathway for bypassing DNA lesions.

    Purpose of the Study:

    • To investigate the roles of different DNA polymerases in Translesion DNA Synthesis.
    • To understand how cells handle replication-blocking DNA lesions.

    Main Methods:

    • The study focuses on DNA polymerases in Escherichia coli and Salmonella typhimurium.
    • Analysis of the function of DNA polymerases II, IV, and V in TLS.

    Main Results:

    • Escherichia coli and Salmonella typhimurium have five DNA polymerases, with pols II, IV, and V primarily responsible for TLS.
    • Pol V handles a broad spectrum of DNA lesions and is key for mutagenic TLS.
    • Pols II and IV are specialized TLS polymerases.

    Conclusions:

    • Specialized DNA polymerases are essential for navigating DNA damage during replication.
    • TLS ensures genome duplication and cell survival despite DNA lesions.
    • Differential roles of pols II, IV, and V highlight the complexity of DNA repair pathways.