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Next-generation Sequencing03:00

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The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling
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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling

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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling.

Stefan Ilic1, Shira Cohen1, Ariel Afek2

  • 1Department of Chemistry, Ben-Gurion University of the Negev.

Journal of Visualized Experiments : Jove
|October 29, 2019
PubMed
Summary
This summary is machine-generated.

DNA primase uses a specific DNA sequence for binding, which affects RNA primer length and DNA replication efficiency. High-throughput primase profiling (HTPP) offers a scalable method to study this DNA primase recognition.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • DNA primase synthesizes RNA primers essential for DNA replication initiation, particularly for Okazaki fragments on the lagging strand.
  • Prokaryotic DnaG-like primases bind to specific trinucleotide sequences on DNA, a critical step in Okazaki fragment formation.
  • Traditional methods for determining DNA recognition sequences offer limited insights into primase-DNA interactions.

Purpose of the Study:

  • To develop and validate a high-throughput method for characterizing DNA primase sequence recognition.
  • To investigate the influence of flanking sequences on primase binding affinity and DNA primase activity.
  • To correlate DNA primase binding strength with RNA primer length and enzyme processivity.

Main Methods:

  • Development of high-throughput primase profiling (HTPP), combining protein-binding microarray (PBM) and primase activity assays.
  • Utilizing microarray-based binding assays to assess primase interactions with various DNA sequences.
  • Performing biochemical analyses to correlate binding data with primase activity and primer synthesis.

Main Results:

  • The specific binding context, including flanking sequences, significantly influences DNA primase binding strength to template DNA.
  • Stronger binding of DNA primase to the template DNA results in the synthesis of longer RNA primers.
  • Increased RNA primer length indicates higher processivity of the DNA primase enzyme.

Conclusions:

  • High-throughput primase profiling (HTPP) enables scalable and efficient characterization of DNA primase sequence recognition.
  • DNA primase binding affinity is modulated by flanking sequences, impacting enzyme processivity and primer synthesis.
  • HTPP provides unprecedented insights into the regulation of DNA replication initiation by DNA primase.