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Structural basis for promiscuous PAM recognition in type I-E Cascade from E. coli.

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The CRISPR-Cas immune system uses Cascade to bind foreign DNA, recognizing PAM sequences via minor groove interactions. This binding initiates DNA unwinding and R-loop formation, essential for prokaryotic defense against invaders.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Microbiology

Background:

  • Prokaryotic adaptive immunity relies on CRISPR-Cas systems to defend against foreign genetic elements.
  • Type I CRISPR systems, comprising Cascade and Cas3, are prevalent and utilized for gene regulation.
  • Cascade facilitates crRNA-guided DNA targeting, leading to R-loop formation and subsequent DNA degradation by Cas3.

Purpose of the Study:

  • To elucidate the structural mechanisms of target DNA recognition and R-loop formation by the Type I CRISPR-Cas system.
  • To provide atomic-level insights into the interaction between Escherichia coli Cascade and foreign double-stranded DNA.

Main Methods:

  • X-ray crystallography was employed to determine the structure of E. coli Cascade bound to a foreign DNA target at 2.45 Å resolution.

Main Results:

  • The 5'-ATG protospacer adjacent motif (PAM) is recognized through minor groove interactions by the Cascade Cse1 subunit.
  • Minor groove DNA recognition explains Cascade's ability to bind multiple PAM sequences.
  • PAM recognition triggers DNA unwinding and directional R-loop formation, with the non-target strand stabilized by the Cse2 dimer.

Conclusions:

  • The study reveals the structural basis for PAM-dependent, directional R-loop formation in CRISPR-Cas immunity.
  • Understanding these structural dynamics is key to comprehending prokaryotic defense mechanisms and for biotechnological applications.