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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
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Rab Cascades01:25

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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Rab Proteins01:14

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Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
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Noncovalent Attractions in Biomolecules02:35

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Updated: Nov 26, 2025

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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Un ratchet hidrofóbico atrinchera los complejos moleculares

Georg K A Hochberg1, Yang Liu2, Erik G Marklund3

  • 1Department of Ecology and Evolution, University of Chicago, Chicago, IL, USA.

Nature
|December 10, 2020
PubMed
Resumen

Muchos complejos de proteínas persisten debido a una "raqueta mutacional hidrofóbica". Este mecanismo afianza los ensamblajes moleculares, incluso cuando su multimerización no ofrece una clara ventaja funcional, al hacer que las formas no ensambladas sean inestables.

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Área de la Ciencia:

  • Biología molecular
  • Biología evolutiva
  • Bioinformática estructural

Sus antecedentes:

  • La mayoría de las proteínas funcionan como complejos de múltiples subunidades.
  • La persistencia evolutiva de los complejos de proteínas a menudo se atribuye a la selección de las ventajas funcionales de la multimerización.
  • Sin embargo, muchos complejos carecen de funciones conocidas atribuibles a su ensamblaje.

Objetivo del estudio:

  • Investigar un mecanismo alternativo para el afianzamiento evolutivo de los complejos proteicos.
  • Para probar la hipótesis de que un ratchet mutacional hidrofóbico puede estabilizar complejos independientemente de la función.
  • Explorar el papel de la estabilidad de las proteínas y la exposición al disolvente en el mantenimiento de los conjuntos moleculares.

Principales métodos:

  • Reconstrucción de proteínas ancestrales y ensayos bioquímicos aplicados a los receptores de hormonas esteroides.
  • Análisis bioinformático estructural de las interfaces de las proteínas y sus propensiones mutacionales.
  • Análisis de bases de datos de cientos de familias multimer para las firmas de atrincheramiento.

Principales resultados:

  • Una interfaz hidrofóbica antigua y conservada en los receptores de hormonas esteroides está arraigada debido a la estabilidad y agregación reducidas al exponerse al disolvente, a pesar de carecer de una función discernible.
  • Un sesgo mutacional universal favorece las sustituciones hidrofóbicas en sitios enterrados dentro de las interfaces multiméricas, que son perjudiciales en los monómeros.
  • La mayoría de las familias multimer analizadas muestran evidencia de arraigo hidrofóbico a largo plazo.

Conclusiones:

  • Una mutación hidrofóbica impulsa sistemáticamente el afianzamiento de los complejos moleculares.
  • Este mecanismo explica la persistencia de muchos complejos proteicos, incluso cuando su ensamblaje es funcionalmente gratuito.
  • La estabilidad del complejo proteico, impulsada por interacciones hidrofóbicas, puede anular la necesidad de una ventaja funcional en la persistencia evolutiva.