Video Experimental Relacionado
Updated: Jul 30, 2025

08:07
Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis
Published on: July 6, 2021
2.7K
SnapShot: Biogénesis del ribosoma eucariótico I
Ed Hurt1, Jingdong Cheng2, Jochen Baβler1
1Heidelberg University Biochemistry Center (BZH), Heidelberg, Germany.
Cell
|May 12, 2023
Resumen
La producción de ribosomas celulares es esencial e involucra más de 200 factores de ensamblaje. Este estudio visualiza los pasos clave en la biogénesis del ribosoma pequeño, revelando los mecanismos de síntesis de la subunidad 40S.
Área de la Ciencia:
- Biología molecular
- Biología celular
- La bioquímica
Sus antecedentes:
- La producción de ribosomas es un proceso celular fundamental crucial para la síntesis de proteínas.
- La desregulación de la biogénesis ribosómica está relacionada con varias enfermedades humanas.
- El proceso implica una compleja interacción de aproximadamente 200 factores de ensamblaje.
Objetivo del estudio:
- Aclarar los mecanismos estructurales subyacentes a la biogénesis de los ribosomas pequeños (subunidad 40S).
- Visualizar el camino dinámico del ensamblaje de ribosomas desde los pre-ribosomas iniciales hasta las subunidades maduras.
Principales métodos:
- Utilizando técnicas de biología estructural para capturar instantáneas de los intermedios de la biogénesis.
- Análisis de los datos estructurales de los primeros ribosomas 90S y las etapas posteriores de ensamblaje.
Principales resultados:
- Conocimiento estructural detallado de la vía ordenada del ensamblaje de ribosomas.
- Identificación de los intermedios estructurales clave en la formación de la subunidad ribosómica 40S.
- Desentrañar las funciones funcionales de los factores de ensamblaje durante la biogénesis.
Conclusiones:
- Las instantáneas estructurales proporcionan una comprensión mecánica crítica de la síntesis de ribosomas pequeños.
- Los hallazgos iluminan el intrincado proceso de producción de ribosomas, vital para la función celular.
- Este trabajo contribuye a la comprensión de las bases moleculares de las enfermedades relacionadas con la biogénesis ribosómica.
Videos de Conceptos Relacionados
Ribosomal RNA Synthesis
13.3K
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
13.3K
Ribosomes
68.5K
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome...
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome...
68.5K
Initiation of Translation
34.3K
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...
34.3K
Ribosome Profiling
3.6K
Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
3.6K
Translation in Prokaryotes
72
Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
72
Improving Translational Accuracy
11.7K
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...
11.7K

