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Kinetics of Lagging-strand DNA Synthesis In Vitro by the Bacteriophage T7 Replication Proteins

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Published on: February 25, 2017

Coordinated DNA Replication by the Bacteriophage T4 Replisome.

Erin Noble¹, Michelle M Spiering², Stephen J Benkovic³

¹Pennsylvania State University, Department of Chemistry, 414 Wartik Laboratory, University Park, PA 16802, USA. eun2@psu.edu.

|June 24, 2015

Summary

The T4 bacteriophage replisome uses eight proteins for coordinated DNA synthesis. Protein complexes link activities and tether enzymes to the replication fork for efficient DNA replication.

Keywords:

DNA replication T4 bacteriophage replisome

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Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

Published on: October 9, 2009

Area of Science:

Molecular Biology
Biochemistry
Virology

Background:

The T4 bacteriophage provides a well-characterized model system for studying DNA replication.
Its eight encoded proteins are sufficient for coordinated leading and lagging strand DNA synthesis.
Recent studies offer deeper insights into the dynamics and coordination of proteins at the replication fork.

Purpose of the Study:

To elucidate the mechanisms of coordinated DNA synthesis by the T4 bacteriophage replisome.
To understand how protein complexes link catalytic activities and tether proteins at the replication fork.

Main Methods:

In vitro reconstitution of DNA synthesis using purified T4 bacteriophage proteins.
Analysis of protein complex formation, including holoenzymes and the primosome.
Investigating the dynamics and coordination of proteins at the replication fork.

Main Results:

Demonstrated that eight purified T4 bacteriophage proteins can reconstitute DNA synthesis in vitro.
Identified essential holoenzyme complexes (polymerase and processivity clamp) for both leading and lagging strand synthesis.
Characterized the primosome (helicase and primase complex) responsible for unwinding and primer synthesis.

Conclusions:

Protein complexes are crucial for coordinating DNA synthesis, priming, and unwinding at the replication fork.
The dimeric holoenzyme structure allows the lagging strand polymerase to remain associated with the replisome.
Future research will focus on the precise architecture and orientations of protein complexes within the replisome.