相关实验视频
Updated: Jul 18, 2026

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Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
在Archaea中小核核RNA的同类物
A D Omer1, T M Lowe, A G Russell
1Department of Biochemistry and Molecular Biology, University of British Columbia, 2146 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada.
概括
研究人员在Archaea中发现了小雪状RNA (sRNA),这表明小核核RNA (snoRNA) 引导的核糖体RNA修饰存在于Archaea和Eukarya的共同祖先中.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 细胞核核糖体RNAs (rRNAs) 经历了由小核核RNAs (snoRNAs) 引导的众多转录后修饰.
- 在Archaea中snoRNAs的存在和功能以前是未知的.
研究的目的:
- 在考古基因组中调查snoRNA同类的存在.
- 为了识别和表征古生物中的小雪状RNAs (sRNAs).
- 为了推断snoRNA引导的rRNA修饰的进化起源.
主要方法:
- 考古纤维拉林和NOP56蛋白质的共免疫沉,以分离相关的小RNA.
- 克隆和测序来自Sulfolobus acidocaldarius.发现的小雪状RNAs (sRNAs).
- 开发一种概率模型,用于在古代基因组中确定额外的sRNA.
主要成果:
- 从Sulfolobus acidocaldarius中克隆了18个sRNA.
- 超过200个额外的sRNA被识别在七个考古基因组,跨越Crenarchaeota和Euryarchaeota.
- 在两个主要的考古学分支中都发现了snoRNA基因的同类.
结论:
- 小核RNA (snoRNA) 引导的rRNA处理可能早于古生物和真核生物的分歧.
- 这种机制存在于Archaea和Eukarya的最后一个共同祖先中,先于一个独特的核的进化.
相关概念视频
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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, the...
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, the...
Nucleic Acids
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, the...
DNA and RNA
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Nucleic Acids
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, the...
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, the...
Nucleic Acids
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, the...
DNA and RNA
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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.
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DNA has a double-helix structure. The...
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Nucleoid
The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...

