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Mismatch Repair01:36

Mismatch Repair

Overview
Translation01:31

Translation

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
Improving Translational Accuracy02:07

Improving 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...
Translation01:31

Translation

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
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Translation in Prokaryotes01:29

Translation in Prokaryotes

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...

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Video Experimental Relacionado

Updated: May 11, 2026

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
14:06

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays

Published on: November 12, 2012

Traducción errónea en E. coli.

P Edelmann, J Gallant

    Cell
    |January 1, 1977
    PubMed
    Resumen
    Este resumen es generado por máquina.

    La traducción errónea de flagelina bacteriana se midió mediante la incorporación de 35S-cisteína. Los antibióticos como la estreptomicina aumentaron esta mistranslación, lo que indica errores en la síntesis de proteínas.

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    Área de la Ciencia:

    • Microbiología Microbiología.
    • Biología Molecular Biología Molecular
    • Genética La genética.

    Sus antecedentes:

    • La flagelina, un componente clave de los flagelos bacterianos, carece naturalmente de residuos de cisteína.
    • La mistraducción, o errores en la síntesis de proteínas, puede ocurrir in vivo e impactar en la función celular.
    • Se sabe que los antibióticos como la estreptomicina y la neomicina inducen errores en la síntesis de proteínas in vitro.

    Objetivo del estudio:

    • Para cuantificar la mistranslación in vivo mediante la medición de la incorporación de 35S-cisteína en la flagelina.
    • Para investigar el efecto de la estreptomicina y la neomicina en la flagelina mistranslation.
    • Para determinar la probabilidad de lectura errónea del codón durante la síntesis de proteínas.

    Principales métodos:

    • Purificación de la flagelina a partir de cultivos bacterianos.
    • Detección de la incorporación de 35S-cisteína en la flagelina mediante el uso de SDS-PAGE.
    • Análisis de las tasas de traducción errónea en condiciones normales y tratadas con antibióticos.
    • Investigación de la lectura errónea del codón de arginina y su efecto en la incorporación de cisteína.

    Principales resultados:

    • Se detectaron trazas de 35S-cisteína en la flagelina en condiciones normales (aprox. 6 X 10(-4) pmoles de cisteína/pmoles de flagelina).
    • La estreptomicina y la neomicina aumentaron significativamente la incorporación de 35S-cisteína en la flagelina.
    • El hambre de arginina exacerbó la incorporación de cisteína en un mutante relA-, lo que sugiere una lectura errónea de los codones de arginina (CGU/CGC).

    Conclusiones:

    • La mistranslación in vivo se puede medir con precisión mediante la incorporación de aminoácidos etiquetados en proteínas libres de cisteína como la flagelina.
    • La estreptomicina y la neomicina inducen una traducción errónea significativa, probablemente a través de una lectura errónea de los codones de arginina.
    • La probabilidad deducida de lectura errónea por codón está en el rango de 10(-4).