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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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,...
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Energy to Drive Translocation01:37

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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Insertion of Single-pass Transmembrane Proteins in the RER01:26

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Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
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Video Experimental Relacionado

Updated: Sep 10, 2025

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Dimerización de la hélice transmembrana STIM1 capturada por el muestreo de la trayectoria de transición guiado por IA

Ferdinand Horvath1, Hendrik Jung2, Herwig Grabmayr3

  • 1Institute of Theoretical Physics, Johannes Kepler University Linz, 4040 Linz, Austria.

Proceedings of the National Academy of Sciences of the United States of America
|August 26, 2025
PubMed
Resumen

La dimerización de la proteína de la molécula de interacción estroma 1 (STIM1) es clave para la detección del calcio. Las simulaciones guiadas por IA revelan tres configuraciones distintas de dímeros de hélice transmembrana STIM1, aclarando su mecanismo.

Palabras clave:
El STIM1Dimerización de la hélice TMIngreso de calcio en el almacénMuestreo de la trayectoria de transición

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Área de la Ciencia:

  • La biofísica
  • Biología molecular
  • Señales de calcio

Sus antecedentes:

  • La molécula de interacción estroma 1 (STIM1) es un sensor crucial de Ca2+ ubicado en la membrana del retículo endoplasmático (ER).
  • El agotamiento de ER Ca2+ desencadena cambios conformacionales en STIM1, iniciando las vías de señalización del calcio.
  • La dimerización del dominio transmembrana (TM) de STIM1 es un paso temprano crítico en este proceso.

Objetivo del estudio:

  • Para aclarar los mecanismos atómicos que rigen la dimerización de la hélice transmembrana STIM1.
  • Identificar distintas configuraciones de dímeros STIM1 y sus estados de transición asociados.
  • Validar los resultados de las simulaciones con estudios experimentales de mutagénesis.

Principales métodos:

  • Utilizado el muestreo de trayectoria de transición guiado por IA (aimmd) para simulaciones extensas de dinámica molecular (MD).
  • Se realizaron simulaciones de MD de todos los átomos en un entorno de doble capa lipídica que imitaba el ER.
  • Los resultados computacionales integrados con los experimentos de propensión a la dimerización basados en la fluorescencia in vitro.

Principales resultados:

  • Se identificaron tres configuraciones de dímeros de hélice STIM1 TM distintas y coexistentes, resolviendo discrepancias experimentales anteriores.
  • La configuración de dímeros dominante presenta una interfaz en forma de X estabilizada por el motivo SxxxG.
  • La mutagenesis del motivo SxxxG alteró la propensión a la dimerización de STIM1 en ensayos experimentales.
  • Caracterizó el conjunto de estados de transición, destacando la importancia de los contactos interhélicos luminales.

Conclusiones:

  • Las simulaciones de MD guiadas por IA proporcionan detalles atomísticos sin precedentes en eventos moleculares raros como la dimerización STIM1.
  • La dimerización de la hélice STIM1 TM se produce a través de múltiples vías, influenciadas por las interacciones luminales.
  • Estos hallazgos ofrecen una comprensión mecanicista del papel de STIM1 en la homeostasis celular del calcio.