関連する実験動画
Updated: May 18, 2026
10:00
Assessment of Selective mRNA Translation in Mammalian Cells by Polysome Profiling
Published on: October 28, 2014
まとめ
細胞骨格タンパク質は,合成中に細胞骨格に結合する. この in vitro 研究は,これらのタンパク質が細胞骨格と結合するのは,その後のことではなく,生成中のものであることを確認しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 細胞骨格のダイナミクス
背景:
- 細胞骨格タンパク質は,合成部位の近くでin vivoで集合することが知られている.
- 以前の研究では,タンパク質合成と細胞骨組みの組み立ての間の時間的,空間的な関連が示唆されていました.
研究 の 目的:
- 細胞骨格と細胞骨格のタンパク質結合の正確なタイミングとメカニズムを調査する.
- 細胞骨格タンパク質がトランスレーション中または後に既存の構造と結合するかどうかを判断する.
主な方法:
- 準備されたHeLa細胞骨格と in vitro翻訳システムを利用しました.
- 35S-メチオニンは,特殊なバッファーのトランスレーション中にポリペプチドに組み込まれています.
- 新しく合成されたタンパク質と細胞骨格の安定性と結合特性を評価した.
主要な成果:
- HeLa細胞骨格は35S-メチオニンを効果的にポリペプチドに組み込みました.
- 新しく合成された細胞骨格タンパク質は,溶性タンパク質濃度に関係なく,細胞骨格と関連しています.
- これらの関連性は,タンパク質の完成前にプロミシン耐性であり,同翻訳結合を示唆しています.
- In vitroの関連は,in vivoのタンパク質関連をよく反映した.
結論:
- 多くの細胞骨格タンパク質は,翻訳過程で細胞骨格と結合する.
- この共同翻訳的関連メカニズムは,細胞骨格の組織化における重要な要因である.
- この発見は,細胞骨格タンパク質の動態と組み立ての精密な理解を提供します.
関連する概念動画
01:31Translation
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
02:07Improving Translational Accuracy
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...
02:33Initiation of Translation
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
02:11Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
01:31Translation
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
02:33Initiation of Translation
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...