使用三重形成核酸识别非正规的RNA基对
Sara Farshineh Saei1, Vladislavs Baskevics2, Martins Katkevics2
1Department of Chemistry, Binghamton University, The State University of New York, Binghamton, New York 13902, United States.
ACS chemical biology
|December 23, 2024
概括
核酸 (PNA) 现在可以识别非正规的RNA基对,扩大它们的实用性超出标准的沃森-克里克结构. 这一突破可以更好地识别生物功能至关重要的复杂RNA动机的分子.
科学领域:
- RNA结构生物学的RNA结构生物学
- 化学生物学是化学生物学.
- 分子识别分子识别
背景情况:
- 非正规的基对对RNA结构和功能至关重要.
- 识别这些多样化和动态的RNA基因是具有挑战性的.
- 核酸 (PNA) 是沃森-克里克RNA复合体的有效连接体.
研究的目的:
- 研究PNA在识别非正规RNA基对方面的潜力.
- 探索 PNA 与 G-o-U,A-o-C 和双联 G-o-A/A-o-G 基对结合到 RNA 螺旋体的结合.
- 评估PNA-RNA三环螺旋形成的稳定性和结构基础,具有非正规的图案.
主要方法:
- 三重形成PNAs的合成和表征.
- 生物物理测试以确定结合亲缘关系和稳定性.
- 模拟分子动力学以分析键和结构动力学.
主要成果:
- PNAs成功地与非正规的纯素基对 (G-o-U,G-o-A,A-o-G) 形成了Hoogsteen三重组,其稳定性与正规对相比.
- 识别非正规的金字素基对 (A-o-C,U-o-G) 更具挑战性,稳定性各不相同.
- 分子动力学证实了稳定的PNA-RNA三倍体中预期的Hoogsteen键的形成.
结论:
- PNA识别扩展到更广泛的非正规RNA基对和基因的范围.
- 这扩大了PNA针对复杂和生物学相关RNA结构的实用性.
- 这些发现为新的RNA向治疗和诊断铺平了道路.
相关概念视频
Nucleic Acid Structure
5.9K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
DNA Structure
DNA...
5.9K
DNA Base Pairing
26.8K
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,
26.8K
Transfer RNA Synthesis
11.9K
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
11.9K
Nucleic Acids
43.6K
Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
43.6K
Improving Translational Accuracy
8.8K
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
8.8K
Proofreading
6.2K
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
Errors During Replication are Corrected by the DNA Polymerase...
6.2K


