Video Experimental Relacionado
Updated: Jun 25, 2026
09:33
Rapid Isolation of the Mitoribosome from HEK Cells
Published on: October 4, 2018
Un modelo jerárquico para la evolución del ARN ribosomal 23S
Konstantin Bokov1, Sergey V Steinberg
1Département de Biochimie, Université de Montréal, Montréal, H3C 3J7 (Québec), Canada.
Nature
|February 20, 2009
Resumen
El ribosoma es el ribosoma.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- Biología molecular La biología molecular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El ribosoma es esencial para toda la vida, surgiendo hace casi cuatro mil millones de años.
- La evolución temprana de los ribosomas se entiende mal debido a la presunta erosión de las huellas antiguas.
- La estructura moderna de los ribosomas ofrece pistas potenciales sobre sus orígenes.
Objetivo del estudio:
- Para investigar la historia evolutiva temprana del ribosoma.
- Para identificar patrones estructurales conservados indicativos del ensamblaje primordial del ribosoma.
- Desafiar la noción de que se pierden todos los rastros de la evolución temprana de los ribosomas.
Principales métodos:
- Análisis estructural detallado del ribosoma moderno.
- Análisis comparativo de los componentes ribosómicos en diferentes formas de vida.
- Los enfoques bioinformáticos y filogenéticos para inferir estructuras ancestrales.
Principales resultados:
- El ribosoma moderno exhibe un esquema evolutivo sorprendentemente concertado y modular.
- Los motivos estructurales específicos sugieren un proceso de ensamblaje gradual en la evolución temprana del ribosoma.
- La evidencia apunta a una arquitectura fundamental conservada establecida temprano en la historia de la vida.
Conclusiones:
- La evolución del ribosoma no fue un proceso caótico, sino que siguió un camino estructurado y modular.
- La estructura fundamental del ribosoma es antigua y altamente conservada.
- Las estructuras modernas de los ribosomas conservan las firmas de sus etapas evolutivas tempranas y fundamentales.
Videos de Conceptos Relacionados
02:53Ribosomal RNA Synthesis
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,...
02:53Ribosomal RNA Synthesis
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,...
00:43Bacterial RNA Polymerase
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
00:43Bacterial RNA Polymerase
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
01:53Bacterial Transcription
RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
01:27Ribosomes
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 production. Within...
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 production. Within...