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Proofreading

Proofreading

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...

Proofreading

Proofreading

PCR

PCR

Bacterial RNA Polymerase

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

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...

PCR - Polymerase Chain Reaction

PCR - Polymerase Chain Reaction

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Related Experiment Video

Updated: May 6, 2026

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

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

Published on: October 6, 2017

Directed polymerase evolution.

Tingjian Chen¹, Floyd E Romesberg¹

¹Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States.

|November 12, 2013

Summary

This summary is machine-generated.

Directed evolution modifies natural polymerases for biotechnology applications. This process tailors enzyme properties and substrate usage, overcoming natural limitations for research and medicinal uses.

Keywords:

Directed evolution Modified nucleotide Polymerase Protein engineering

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli

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Published on: March 16, 2011

Area of Science:

Biochemistry and Molecular Biology
Enzymology
Biotechnology

Background:

Polymerases are essential enzymes for DNA and RNA synthesis, fundamental to genetic information in all cells.
Natural polymerases have limitations for specific laboratory applications due to their evolved functions and strict substrate fidelity.
These limitations hinder their use with modified substrates and under non-native conditions.

Purpose of the Study:

To overcome the limitations of natural polymerases for biotechnology and medicinal research.
To tailor polymerase properties and substrate repertoire for diverse applications.
To develop and refine directed evolution systems for enzyme engineering.

Main Methods:

Utilizing directed evolution to create diverse pools of mutated polymerases.
Employing various methods for random mutagenesis to generate genetic variation.
Implementing selection processes to isolate polymerases with desired enhanced functionalities.

Main Results:

Successfully evolved a variety of polymerases with novel or improved functionalities.
Demonstrated the effectiveness of directed evolution in tailoring enzyme performance.
Gained new insights into the molecular factors that govern polymerase activity and substrate specificity.

Conclusions:

Directed evolution is a powerful strategy for engineering polymerases beyond their natural capabilities.
Tailored polymerases significantly advance biotechnology and medicinal research by enabling new applications.
This approach provides valuable understanding of enzyme adaptation and engineering principles.