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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Differential Allosteric Modulation of Cas9 Specificity.

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CRISPR-Cas9 gene editing precision is improved by altering guide RNAs (gRNAs) or Cas9. These changes, though distant from the active site, allosterically control Cas9 by immobilizing the HNH nuclease domain, enhancing editing specificity.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genomics

Background:

  • CRISPR-Cas9 gene editing relies on precise targeting, but off-target cleavage remains a challenge.
  • Strategies like modified guide RNAs (gRNAs) and Cas9 variants aim to enhance specificity.
  • The molecular mechanisms underlying how distant modifications affect Cas9 activity are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which PAM-distal alterations modulate CRISPR-Cas9 activity and specificity.
  • To investigate how gRNA truncation, base mismatching, and Cas9 mutations impact Cas9 conformational dynamics and allosteric regulation.
  • To establish a dynamic framework linking distal structural perturbations to Cas9 activity control.

Main Methods:

  • Near-millisecond all-atom molecular dynamics simulations were employed.
  • Simulations analyzed the effects of diverse PAM-distal perturbations on Cas9.
  • Conformational dynamics and allosteric regulation of Cas9 were investigated.

Main Results:

  • All tested perturbations, including gRNA truncation and base mismatching, impede the transition to the catalytically active state by altering HNH dynamics.
  • Distinct allosteric routes were identified for different perturbations, including REC3 reorientation and L2 linker engagement.
  • Evolved mutations were found to remodel global motional modes, constraining HNH flexibility.

Conclusions:

  • Multiple structural pathways converge on HNH immobilization and catalytic suppression, unifying the effects of RNA, DNA, and protein modifications.
  • This study provides mechanistic insights into Cas9 fidelity regulation.
  • The findings offer principles for designing next-generation, high-precision genome editors.