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Videos de Conceptos Relacionados

tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
Tail-anchoring of Proteins in the ER Membrane01:45

Tail-anchoring of Proteins in the ER Membrane

Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
Transfer RNA Synthesis02:36

Transfer RNA Synthesis

One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Cotranslational Protein Translocation01:20

Cotranslational Protein Translocation

Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...

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Video Experimental Relacionado

Updated: May 29, 2026

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli
11:08

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Published on: December 9, 2017

Modificación de proteínas N-terminales mediante el uso de simples sustratos de aminoacil transferasa.

Anne M Wagner1, Mark W Fegley, John B Warner

  • 1Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States.

Journal of the American Chemical Society
|September 8, 2011
PubMed
Resumen

Este estudio muestra que la Escherichia coli aminoacil tRNA transferasa (AaT) puede utilizar de manera eficiente sustratos simples de adenosina para la modificación de proteínas N-terminales. Esto expande el alcance del sustrato y la escala de reacción para la ingeniería de proteínas mientras se mantiene el plegamiento de las proteínas.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Ingeniería de proteínas Ingeniería de proteínas.
  • Biología sintética Biología sintética.

Sus antecedentes:

  • La aminoacil tRNA transferasa (AaT) de Escherichia coli modifica los N-terminales de la proteína utilizando donantes de tRNA u oligonucleótidos.
  • Los métodos actuales para la modificación de proteínas N-terminales se enfrentan a limitaciones de sustrato y síntesis compleja.

Objetivo del estudio:

  • Demostrar la capacidad de AaT para utilizar unos mínimos sustratos de adenosina para la modificación de proteínas N-terminales.
  • Para superar las limitaciones de las técnicas de modificación de proteínas existentes.

Principales métodos:

  • Caracterización de la actividad enzimática de AaT con nuevos donantes de aminoacil adenosil.
  • Síntesis de sustratos mínimos de adenosina a partir de materiales fácilmente disponibles.
  • Evaluación de la inhibición del producto de reacción en la actividad de AaT.

Principales resultados:

  • AaT utiliza eficientemente unos mínimos sustratos de adenosina para la modificación del N-terminal.
  • Los donantes de adenosil se sintetizan en uno o dos pasos.
  • Los productos de reacción no inhiben la actividad de AaT.
  • Este método evita las limitaciones de la sintetasa y la síntesis compleja de oligonucleótidos.

Conclusiones:

  • Los donantes de adenosil mejoran significativamente el alcance del sustrato y la escala de reacción para la modificación de la proteína N-terminal mediada por AaT.
  • Este enfoque facilita la ingeniería de proteínas en condiciones que preservan el plegamiento de las proteínas.
  • La síntesis simplificada del sustrato ofrece un método más accesible para los estudios funcionales de las proteínas.