相关实验视频
Updated: Sep 16, 2025

11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
27.5K
通过SpCas12f1对顺序dSDNA裂变的结构和机制见解
Julene Madariaga-Marcos1, Marius Baltramonaitis2, Selgar Henkel-Heinecke1
1Peter Debye Institute for Soft Matter Physics, Universität Leipzig, Leipzig 04103, Germany.
Nucleic acids research
|July 12, 2025
概括
微型CRISPR-Cas12f1 (SpCas12f1) 基因组工程工具形成稳定的R循环. DNA 裂变涉及快速的非目标链降解,其次是较慢的目标链切割.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 基因组学就是基因组学.
背景情况:
- 微型CRISPR-Cas12f1效应器复合体对于基因组工程具有价值.
- Cas12f1 作为一种使用单一导向RNA的同分体而起作用.
- 卡斯12f1的精确反应动态在很大程度上仍然没有被描述.
研究的目的:
- 为了研究Syntrophomonas palmitatica Cas12f1 (SpCas12f1) 的DNA识别和分裂机制.
- 为了阐明SpCas12f1介导的DNA处理过程中的动态事件.
主要方法:
- 通过X射线晶体学来确定SpCas12f1-DNA复杂结构.
- 单分子磁子用于动态测量.
- 组合动力学测试以测定反应速率.
主要成果:
- SpCas12f1形成稳定的18bp R-循环,由局部蛋白质-R-循环相互作用稳定.
- 基因分裂是由单个催化中心介导的.
- 非目标链的降解在随机地点迅速发生 (∼11 bp).
- 目标链切割是一个较慢的过程,取决于非目标链切割.
结论:
- SpCas12f1采用了一种独特的机制,包括用于DNA向的R循环稳定.
- 非目标和目标链的顺序分离决定了 SpCas12f1 的整体活动.
- 了解这些动态对于优化 SpCas12f1 在基因组工程中至关重要.
相关概念视频
Single-Strand DNA Binding Proteins
15.0K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
15.0K
Restarting Stalled Replication Forks
5.9K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
5.9K
Caspases
12.7K
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
12.7K
CRISPR and crRNAs
17.4K
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...
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...
17.4K
DNA Helicases
22.3K
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
22.3K
CRISPR
53.0K
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...
53.0K

