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Ribosomes01:27

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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 AssemblyRibosomes 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 the...
Ribosomes01:27

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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 AssemblyRibosomes 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 the...
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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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Ribozymes02:47

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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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Ribosomes01:27

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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
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Capping por ramificación: una nueva ribozima hace pequeños lariats.

Anna Marie Pyle1

  • 1Department of Molecular Biophysics and Biochemistry, Howard Hughes Medical Institute, Yale University, 266 Whitney Avenue, Bass Building Room 334, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|September 6, 2005
PubMed
Resumen

Los científicos descubrieron una nueva ribozima de ramificación, expandiendo las enzimas de ARN conocidas. Esta nueva enzima comparte sorprendentes vínculos evolutivos con los intrones del grupo I.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • La catálisis del ARN.

Sus antecedentes:

  • Las enzimas de ARN naturales, o ribozimas, juegan un papel crucial en varios procesos celulares.
  • La diversidad de ribozimas conocidas ha sido históricamente limitada, lo que impide una comprensión completa de su potencial catalítico.
  • Los intrones del grupo I son ARN catalíticos conocidos involucrados en el empalme de ARN y otras manipulaciones genéticas.

Objetivo del estudio:

  • Para informar sobre el descubrimiento y la caracterización de un nuevo tipo de ribozima ramificada.
  • Para investigar las relaciones evolutivas y mecanicistas de esta nueva ribozima.

Principales métodos:

  • Pruebas bioquímicas para determinar la actividad catalítica.
  • Análisis de secuencias y comparaciones filogenéticas.
  • Predicciones estructurales y mapeo de dominio funcional.

Principales resultados:

  • Identificación de una nueva ribozima ramificante con propiedades catalíticas únicas.
  • Demostración de secuencia inesperada y similitudes estructurales entre la nueva ribozima y los intrones del grupo I.
  • El análisis filogenético sugiere una posible conexión evolutiva.

Conclusiones:

  • El descubrimiento de esta ribozima ramificada expande significativamente la diversidad conocida de enzimas de ARN.
  • Los hallazgos sugieren una relación evolutiva más profunda entre las diferentes clases de ribozimas de lo que se apreciaba anteriormente.
  • Este trabajo abre nuevas vías para comprender la evolución del ARN y los mecanismos catalíticos.