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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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Updated: Jan 23, 2026

Substrate Generation for Endonucleases of CRISPR/Cas Systems
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Adaptation processes that build CRISPR immunity: creative destruction, updated.

Chun H Lau1, Ryan Reeves1, Edward L Bolt2

  • 1School of Life Sciences, University of Nottingham, Nottingham, U.K.

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|June 13, 2019
PubMed
Summary
This summary is machine-generated.

Prokaryotes use CRISPR-Cas systems to defend against foreign DNA by storing genetic fragments. New research explores how these systems capture and integrate DNA, offering insights into microbial immunity and biotechnology applications.

Keywords:
CRISPRCas1-Cas2editing

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Prokaryotes possess adaptive immunity against mobile genetic elements (MGEs) via CRISPR-Cas systems.
  • CRISPR arrays store MGE DNA fragments as a memory to prevent reinfection.
  • CRISPR-based immunity relies on adaptation and interference reactions catalyzed by Cas proteins.

Purpose of the Study:

  • To survey the molecular biology of CRISPR adaptation.
  • To highlight new developments in understanding MGE DNA capture and integration into CRISPR arrays.
  • To explore the biotechnological applications of CRISPR adaptation enzymes.

Main Methods:

  • Review of molecular mechanisms underlying CRISPR adaptation.
  • Focus on adaptation processes in *Escherichia coli* with comparative analysis across prokaryotes.
  • Examination of Cas protein functions and accessory enzymes in DNA capture and integration.

Main Results:

  • CRISPR adaptation involves capturing and integrating MGE DNA fragments into CRISPR loci.
  • Diverse prokaryotes employ varied strategies for DNA capture and integration during adaptation.
  • Cas proteins and associated enzymes are crucial for the adaptation process.

Conclusions:

  • Understanding CRISPR adaptation mechanisms is key to microbial immunity.
  • CRISPR adaptation pathways offer insights into DNA capture and integration processes.
  • CRISPR adaptation enzymes have potential applications in biotechnology.