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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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相关实验视频

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

序列和结构特定的RNA被CRISPR内核酶处理.

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
概括
此摘要是机器生成的。

研究人员确定了Csy4酶,该酶对于处理Pseudomonas aeruginosa中的CRISPR转录 (crRNA前) 至关重要. 这种酶利用特定的RNA相互作用和保存的残留物进行选择性结合和分裂,解释了CRISPR免疫系统的功能.

更多相关视频

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

相关实验视频

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

科学领域:

  • 微生物学 微生物学
  • 分子生物学分子生物学
  • 结构生物学 结构生物学

背景情况:

  • 细菌和古生物利用集群的定期间隔的短时间palindromic重复 (CRISPRs) 来适应对外来遗传元素的免疫力.
  • 通过CRISPR介导的免疫依赖于由CRISPR基位转录生成的CRISPR衍生RNAs (crRNAs).

研究的目的:

  • 为了确定负责处理Pseudomonas aeruginosa中的CRISPR转录 (crRNA前) 的特定内啡核酶.
  • 为了阐明被识别的酶对crRNA前处理的分子机制.

主要方法:

  • 细菌遗传学用于识别Pseudomonas aeruginosa中的酶.
  • 进行X射线晶体学以确定与RNA结合的酶的1.8安格斯特罗姆晶体结构.
  • 生物化学试验分析RNA识别和分裂机制.

主要成果:

  • 鉴定出csy4型内啡核酶是 Pseudomonas aeruginosa 中的crRNA 前处理的酶.
  • 结构分析揭示了Csy4和crRNA重复干循环在主要槽中的特定序列相互作用.
  • Csy4在其活性部位中利用保存的氨酸和氨酸残留物来选择性结合和裂解前crRNAs.

结论:

  • 该研究阐明了由Csy4.4处理序列和结构特异的crRNA前处理的机制.
  • 已识别的RNA识别机制为广泛的CRISPR特异性内核酶家族的功能提供了洞察力.
  • 了解Csy4的功能有助于理解细菌适应性免疫和CRISPR-RNA生物发生.