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Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
Protein Complex Assembly02:41

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

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Published on: November 21, 2013

El ensamblaje refleja la evolución de los complejos proteicos.

Emmanuel D Levy1, Elisabetta Boeri Erba, Carol V Robinson

  • 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK. homomers@mrc-lmb.cam.ac.uk

Nature
|June 20, 2008
PubMed
Resumen
Este resumen es generado por máquina.

El ensamblaje de homómeros de proteínas y la evolución comparten caminos conservados. Este estudio revela que la evolución de la estructura cuaternaria de la proteína refleja el ensamblaje celular, lo que permite la predicción de las estructuras cristalinas.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Estructural Biología estructural.
  • Biología evolutiva Biología evolutiva.

Sus antecedentes:

  • Los homómeros, formados por unidades de proteínas que interactúan entre sí, son cruciales para las funciones celulares como la alostería.
  • El mal ensamblaje de los homómeros está relacionado con varias enfermedades, destacando su importancia estructural.
  • A pesar de su prevalencia (50-70% de los estados cuaternarios conocidos), la evolución de los homómeros y los mecanismos de ensamblaje son poco conocidos.

Objetivo del estudio:

  • Para investigar la conservación evolutiva de las estructuras cuaternarias homómero.
  • Aclarar la relación entre las vías evolutivas de los homómeros y sus procesos de ensamblaje en la célula.
  • Desarrollar un modelo predictivo para la evolución y el ensamblaje del complejo proteico basado en datos estructurales.

Principales métodos:

  • Análisis de más de 5.000 estructuras atómicas únicas.
  • Análisis comparativo de familias de proteínas para evaluar la conservación de la estructura cuaternaria.
  • Perturbación de las interfaces de las subunidades y espectrometría de masas para estudiar vías complejas de ensamblaje.

Principales resultados:

  • La estructura cuaternaria del homómero se conserva en más del 70% de los pares de proteínas con ≥30% de identidad de secuencia.
  • Existen vías evolutivas bien definidas para las proteínas que hacen la transición entre tipos de estructura cuaternaria.
  • Se demostró que las vías de desmontaje dentro de la célula imitan las vías evolutivas.

Conclusiones:

  • La evolución de las proteínas y las vías de ensamblaje son molecularmente análogas, reflejando el paradigma de desarrollo de Haeckel.
  • El estudio proporciona un modelo para predecir la evolución del complejo proteico y el ensamblaje de las estructuras cristalinas.
  • Comprender estos mecanismos conservados ofrece información sobre las enfermedades y el potencial para diseñar nuevas máquinas moleculares.