相关实验视频

Updated: Jun 25, 2025

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Published on: September 21, 2017

非酶性RNA模板复制中的二氨

Xiwen Jia^1,2,3, Ziyuan Fang³, Seohyun Chris Kim^1,2,4

¹Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States.

Journal of the American Chemical Society

|May 31, 2024

概括

在非酶性RNA复制中用氨酸 (D) 取代氨酸可以改善遗传信息的传输. 这种修改后的系统显示出更均的产品分布和更低的不匹配频率,

科学领域:

生命研究的起源
前生物化学
分子进化

背景情况:

对于RNA世界中的遗传信息传输而言,非酶性模板拷贝至关重要.
规范性核酸 (A,U,C,G) 导致有偏见的复制,使G:C对比A:U对.
A:U 基对的稳定性限制了高效且无偏差的非酶性RNA复制.

研究的目的:

调查是否用二氨基 (D) 取代腺素 (A) 提高非酶模板复制效率并减少偏差.
探索D在前生物RNA复制系统中作为A更强大的替代品的潜力.
与正规AUCG系统相比,评估DUCG系统的准确性和产品分布.

主要方法:

使用激活核酸和随机RNA模板进行初级扩展试验.
结晶学研究以阐明D:C基配对的结构基础.
深度测序分析以量化产品分布和不匹配频率.

主要成果:

与氨酸 (A) 相比,氨酸 (D) 与 uracil (U) 的结合更强.
通过晶体学观察到D:C不匹配,形成波动类型的基数对.
与AUCG系统相比,DUCG系统显示产品分布更均,不匹配频率更低.

结论:

氨酸 (D) 为非酶性RNA复制提供了一个有前途的替代品.
DUCG系统显示出更高的准确性和产品分布,这与RNA世界场景相关.
需要进一步研究其在早期生命和人工复制系统中的潜在作用.

更多相关视频

Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism

Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism

Published on: July 28, 2017

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Published on: May 10, 2018

相关概念视频

Proofreading

Proofreading

RNA Editing

RNA Editing

RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...

Translesion DNA Polymerases

Translesion DNA Polymerases

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...

Mismatch Repair

Mismatch Repair

Bacterial RNA Polymerase

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

DNA Base Pairing

DNA Base Pairing

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,