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CRISPR01:59

CRISPR

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 Short...
CRISPR01:59

CRISPR

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 Short...
CRISPR and crRNAs02:53

CRISPR and crRNAs

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.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
CRISPR/Cas9 Genome Editing01:28

CRISPR/Cas9 Genome Editing

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...
The Antiviral System of Bacteria and Archaea: CRISPR01:23

The Antiviral System of Bacteria and Archaea: CRISPR

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 defense.
RNA Splicing01:32

RNA Splicing

Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...

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Video Experimental Relacionado

Updated: Jun 8, 2026

Substrate Generation for Endonucleases of CRISPR/Cas Systems
11:53

Substrate Generation for Endonucleases of CRISPR/Cas Systems

Published on: September 8, 2012

Procesamiento de ARN específico de secuencia y estructura por una endonucleasa CRISPR.

Rachel E Haurwitz1, Martin Jinek, Blake Wiedenheft

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.

Science (New York, N.Y.)
|September 11, 2010
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores identificaron la enzima Csy4, que es crucial para el procesamiento de las transcripciones de CRISPR (pre-crRNAs) en Pseudomonas aeruginosa. Esta enzima utiliza interacciones específicas de ARN y residuos conservados para la unión selectiva y la escisión, lo que explica la función del sistema inmunológico CRISPR.

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Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms
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Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms

Published on: May 25, 2018

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Last Updated: Jun 8, 2026

Substrate Generation for Endonucleases of CRISPR/Cas Systems
11:53

Substrate Generation for Endonucleases of CRISPR/Cas Systems

Published on: September 8, 2012

Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms
09:51

Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms

Published on: May 25, 2018

Área de la Ciencia:

  • Microbiología Microbiología.
  • Biología Molecular Biología Molecular
  • Biología Estructural Biología estructural.

Sus antecedentes:

  • Las bacterias y las arqueas utilizan repeticiones palindrómicas cortas agrupadas regularmente espaciadas (CRISPR) para la inmunidad adaptativa contra elementos genéticos extraños.
  • La inmunidad mediada por CRISPR se basa en ARN derivados de CRISPR (ARNcr) generados a partir de las transcripciones de los loci de CRISPR.

Objetivo del estudio:

  • Para identificar la endoribonucleasa específica responsable del procesamiento de las transcripciones de CRISPR (pre-crRNAs) en Pseudomonas aeruginosa.
  • Para dilucidar el mecanismo molecular del procesamiento pre-crRNA por la enzima identificada.

Principales métodos:

  • Genética bacteriana para identificar la enzima en Pseudomonas aeruginosa.
  • Cristalografía de rayos X para determinar la estructura cristalina de 1,8 angstrom de la enzima unida al ARN.
  • Ensayos bioquímicos para analizar el reconocimiento de ARN y los mecanismos de escisión.

Principales resultados:

  • La endoribonucleasa Csy4 fue identificada como la enzima responsable del procesamiento del pre-crRNA en Pseudomonas aeruginosa.
  • El análisis estructural reveló interacciones específicas de la secuencia entre Csy4 y el crRNA que repite el bucle del tallo en la ranura mayor.
  • Csy4 utiliza residuos de serina e histidina conservados en su sitio activo para la unión selectiva y la escisión de pre-crRNAs.

Conclusiones:

  • El estudio aclara el mecanismo de procesamiento de pre-crRNA específico de secuencia y estructura por Csy4.4.
  • El mecanismo de reconocimiento de ARN identificado proporciona información sobre la función de una amplia familia de endoribonucleasas específicas de CRISPR.
  • Comprender la función de Csy4 contribuye a comprender la inmunidad adaptativa bacteriana y la biogénesis del CRISPR-ARN.