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CRISPR and crRNAs02:53

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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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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Structural Principles of CRISPR RNA Processing.

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  • 1Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.

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Summary
This summary is machine-generated.

CRISPR-Cas immunity relies on Cas6, Cas5d, and RNase III enzymes for small RNA (crRNA) production. Structural studies reveal how these enzymes process crRNA and link it to interference, offering insights into molecular evolution and biotechnology.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • CRISPR-Cas systems provide adaptive immunity in prokaryotes through small RNAs called CRISPR RNAs (crRNAs).
  • Cas6, Cas5d, and host RNase III endoribonucleases are key enzymes involved in crRNA biogenesis and may interact with interference complexes.
  • Understanding the structure and function of these enzymes is crucial for elucidating CRISPR-Cas immunity mechanisms.

Purpose of the Study:

  • To provide insights into the principles of crRNA processing.
  • To elucidate the structural basis linking crRNA processing to interference.
  • To explore the potential of Cas6/Cas5d enzymes in molecular evolution and biotechnology.

Main Methods:

  • Recent advancements in structural biology techniques were employed.
  • Analysis of Cas6 and Cas5d enzymes and their complexes with RNA substrates.

Main Results:

  • Cas6 and Cas5d enzymes share a ferredoxin-like fold but exhibit distinct domain arrangements.
  • These enzymes are involved in processing crRNAs essential for CRISPR-Cas immunity.
  • Cas6 proteins can interact with stable RNA structures or induce folding in unstructured RNAs for cleavage.
  • Structural insights connect crRNA processing to the interference function of CRISPR-Cas systems.

Conclusions:

  • Cas6 and Cas5d enzymes play critical roles in crRNA production for CRISPR-Cas immunity.
  • Structural studies reveal the mechanistic basis for crRNA processing and its link to interference.
  • The simple fold, broad substrate range, and kinetics of Cas6/Cas5d make them valuable for studying protein-RNA interactions, molecular evolution, and biotechnological applications.