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Translesion DNA Polymerases

Translesion DNA Polymerases

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...

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 Enzyme

Proofreading

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads 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 EnzymeGenomic DNA is synthesized in...

The Replisome

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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.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...

The Replisome

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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.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...

Replication in Eukaryotes

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DNA Polymerase Activity Assay Using Near-infrared Fluorescent Labeled DNA Visualized by Acrylamide Gel Electrophoresis

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Template-independent DNA polymerases.

Dongxian Yue, Stanley Tabor, Nicole M Nichols

Current Protocols in Molecular Biology

|October 31, 2008

Summary

This summary is machine-generated.

Terminal deoxynucleotidyl transferase (TdT) is a DNA polymerase that adds nucleotides to DNA ends without a template. It has diverse applications in DNA cloning, labeling, and detecting cellular damage.

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Area of Science:

Molecular Biology
Enzymology

Background:

Terminal deoxynucleotidyl transferase (TdT) is a unique DNA polymerase.
It functions independently of a DNA template.

Purpose of the Study:

To describe the reaction conditions for TdT.
To outline various applications of TdT in molecular biology.

Main Methods:

Enzymatic incorporation of deoxynucleotides.
3' end labeling of DNA.
Synthesis of polydeoxynucleotide homopolymers.

Main Results:

TdT efficiently catalyzes deoxynucleotide incorporation at the 3'-hydroxyl terminus.
TdT facilitates DNA fragment cloning and 3' end labeling.
TdT is useful for detecting DNA damage and apoptotic cells.

Conclusions:

TdT is a versatile enzyme with broad applications in molecular biology.
Understanding TdT reaction conditions enhances its utility in research and diagnostics.