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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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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Assembling bacteriophage T7 leading-strand replisome for structural investigation.

Chen-Yu Lo1, Yang Gao1

  • 1Department of BioSciences, Rice University, Houston, Texas, United States.

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Summary

Researchers determined the first structure of a coupled replisome complex, essential for DNA replication. This breakthrough using the bacteriophage T7 replisome provides a model for studying genome stability and replication stress.

Keywords:
Bacteriophage T7Cryo-EMDNA replicationHelicasePolymeraseReplisome

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • The leading-strand replisome, comprising replicative helicase and polymerase, is crucial for DNA unwinding and synthesis during replication.
  • Uncoupling of these enzymes leads to replication stress, errors, and genomic instability.
  • Structural studies of large, dynamic replisome complexes are challenging.

Purpose of the Study:

  • To determine the structure of a coupled helicase-polymerase replisome complex.
  • To establish protocols for preparing and characterizing such complexes.
  • To provide a model system for investigating complex replisomes.

Main Methods:

  • Reconstitution of the bacteriophage T7 replisome complex.
  • Structural determination of the replisome on a DNA fork substrate.
  • Characterization of the coupled helicase-polymerase activity.

Main Results:

  • The first structure of a coupled leading-strand replisome complex was determined using the bacteriophage T7 system.
  • Protocols for preparing and characterizing the T7 replisome were established.
  • The study provides a foundational model for understanding replisome dynamics and structure.

Conclusions:

  • The determined structure offers insights into the coordinated function of helicase and polymerase in DNA replication.
  • The established methods can be adapted for structural studies of more complex eukaryotic replisomes.
  • This work advances our understanding of genome stability mechanisms and potential therapeutic targets for replication stress.