プリ-mRNA結合タンパク質は,RNAを遺伝子から核孔を通り,ポリソームに伴います
N Visa1, A T Alzhanova-Ericsson, X Sun
1Department of Cell and Molecular Biology, Medical Nobel Institute, Karolinska Institutet, Stockholm, Sweden.
Cell
|January 26, 1996
まとめ
哺乳類のHnRNP A1に似たChironomus tentans hrp36タンパク質は,転写中にBalbianiのリングプレ-mRNAと結合する. 核の輸出全体と細胞質ポリソームに結合し続けています.
科学分野:
- 分子生物学と細胞生物学について
- RNA 生物学 RNA 生物学
- タンパク質とRNAの相互作用
背景:
- Chironomus tentansの唾液腺におけるBalbiani環 (BR) は,大規模なmRNA合成の場である.
- プレメッセンジャーリボヌクレオプロテイン (pre-mRNP) 粒子の組み立てと輸送を理解することは,遺伝子発現にとって極めて重要です.
- プレ-mRNP粒子のタンパク質組成は,その加工,核の輸出,および変換に影響を与えます.
研究 の 目的:
- Balbianiリング前伝達子リボヌクレオプロテイン (pre-mRNP) の粒子の豊富なタンパク質 hrp36 の役割を調査する.
- 転写,核エクスポート,および細胞プラズマトランスレーションの間にhrp36とBRRNAの関連ダイナミクスを決定する.
- hrp36を哺乳類の異質核リボヌクレオプロテインA1 (hnRNP A1) などの既知のRNA結合タンパク質と比較する.
主な方法:
- 免疫電子顕微鏡を用いて,hrp36.3の局所性を視覚化しました.
- この研究は,キロノムス・テンタンスの幼虫の唾液腺に焦点を当てた.
- 転写からポリソーム形成までのライフサイクルを通してBRRNAとのHRP36関連性の分析.
主要な成果:
- C. tentansのhrp36タンパク質は,構造的には哺乳類のhnRNP A1.1に類似しています.
- hrp36は,転写と同時にBRRNAに結合し,核プラズマ粒子に結合し続けます.
- hrp36は,BRRNAに結合しながら核孔を通過して転位し,サイトプラズマの巨大BRポリソームに存在します.
結論:
- hrp36はBR前mRNP粒子の重要な成分であり,転写の初期段階から関与しています.
- このタンパク質は,核の輸出と翻訳の間にBRRNAと安定的に結合しています.
- hrp36は,大型BRトランスクリプトの処理,輸送,および/または翻訳において重要な役割を果たしている可能性が高い.
関連する概念動画
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
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...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Nucleic Acid Structure
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 has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...


