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DNA Helicases00:55

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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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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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Genome Maintenance by DNA Helicase B.

Lindsey Hazeslip1, Maroof Khan Zafar1, Muhammad Zain Chauhan1

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DNA Helicase B (HELB) is crucial for DNA replication initiation and stress responses. It moves to the nucleus for replication and the cytosol after cell cycle transition, but relocates to damaged DNA sites.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • DNA Helicase B (HELB) is a conserved helicase in eukaryotes.
  • It plays roles in DNA replication initiation and DNA damage/replication stress responses.
  • HELB interacts with key proteins like TOPBP1, CDC45, and DNA polymerase α-primase during replication initiation.

Purpose of the Study:

  • To elucidate the multifaceted roles of HELB in DNA replication and damage response pathways.
  • To investigate the dynamic subcellular localization of HELB in response to cell cycle progression and DNA damage.
  • To understand HELB's function in inhibiting homologous recombination and its association with fragile sites.

Main Methods:

  • The study likely involves molecular biology techniques, including protein interaction studies, cell cycle analysis, and subcellular localization assays (e.g., immunofluorescence microscopy).
  • Investigating HELB's phosphorylation status in response to DNA damage (e.g., ionizing radiation).
  • Analyzing HELB's role in homologous recombination and its localization at specific fragile sites (FRA16D, FRA3B, FRAXA).

Main Results:

  • HELB is primarily nuclear in G1 phase, facilitating replication initiation.
  • Phosphorylation by CDK2 at G1/S transition causes predominantly cytosolic localization, but HELB can relocate to chromatin under replication stress.
  • HELB inhibits homologous recombination by limiting end resection and localizes to fragile sites and sites of DNA damage.

Conclusions:

  • HELB exhibits dynamic localization crucial for its diverse functions in DNA replication and repair.
  • Its nuclear role in replication initiation contrasts with its cytosolic presence and stress-induced chromatin association.
  • HELB is a key player in maintaining genomic stability through its involvement in DNA damage response pathways.