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Videos de Conceptos Relacionados

Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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...
Post-translational Translocation of Proteins to the RER01:27

Post-translational Translocation of Proteins to the RER

A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
Overview of Protein Sorting and Transport01:45

Overview of Protein Sorting and Transport

Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation.  In gated transport, folded...
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...
Protein Transport to the Thylakoids01:22

Protein Transport to the Thylakoids

Thylakoids are membrane-bound sac-like structures within the chloroplast that serve as sites for photosynthesis. Thylakoid lumen contains many electron transport proteins and is enclosed by a thylakoid membrane rich in the light-harvesting complex. Proteins targeted to the thylakoids are transported as precursors and are sorted by the general TOC/TIC import pathway. Once the precursor reaches the stroma, stromal processing peptidases remove their transit signal and expose thylakoid signal...

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Video Experimental Relacionado

Updated: Jun 13, 2026

Quantitative Immunofluorescence to Measure Global Localized Translation
09:13

Quantitative Immunofluorescence to Measure Global Localized Translation

Published on: August 22, 2017

Los puntos de control secuenciales rigen la selección del sustrato durante la orientación de la proteína

Xin Zhang1, Rumana Rashid, Kai Wang

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|May 8, 2010
PubMed
Resumen

La orientación de proteínas de alta fidelidad en bacterias se basa en múltiples puntos de control, no solo en la unión inicial. La vía de la partícula de reconocimiento de señales (SRP) asegura la entrega correcta de proteínas a través de pasos de selección secuenciales.

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Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides

Published on: June 19, 2012

Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Biología celular Biología celular.
  • La biofísica es la biofísica.

Sus antecedentes:

  • La localización precisa de las proteínas es crucial para la función celular.
  • Los mecanismos precisos que aseguran una alta fidelidad en las vías de orientación de proteínas siguen siendo en gran medida desconocidos.
  • La vía de las partículas de reconocimiento de señales (SRP) en E. coli dirige las proteínas a la membrana interna bacteriana a través de secuencias de señales.

Objetivo del estudio:

  • Investigar los mecanismos subyacentes a la alta fidelidad en la vía bacteriana SRP.
  • Para determinar cómo la vía SRP logra una selección precisa de las proteínas de la carga.

Principales métodos:

  • Utilizó ensayos biofísicos para estudiar las interacciones proteína-carga.
  • Analizó los pasos secuenciales de la vía de orientación de SRP en Escherichia coli.

Principales resultados:

  • La alta fidelidad no depende únicamente de la afinidad de enlace inicial del SRP con la carga.
  • Las proteínas de carga incorrectas se rechazan a través de múltiples puntos de control durante el proceso de orientación.
  • Estos puntos de control actúan de forma acumulativa para garantizar una localización precisa de las proteínas.

Conclusiones:

  • La selección de sustrato de alta fidelidad en la vía SRP resulta de una serie de puntos de control.
  • Este principio de puntos de control múltiples puede ser ampliamente aplicable a otras vías selectivas de reconocimiento de señales.
  • Comprender estos mecanismos es clave para comprender los procesos celulares fundamentales.