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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Conservation of Protein Domains Over Different Proteins02:26

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Protein Folding Quality Check in the RER01:29

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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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.
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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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La selección mejora la evolutividad de las proteínas al aumentar la robustez mutacional y la plegabilidad

Jia Zheng1,2, Ning Guo3, Andreas Wagner4,2,5

  • 1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.

Science (New York, N.Y.)
|December 4, 2020
PubMed
Resumen

Una selección natural más fuerte mejora la evolución de una población, acelerando la evolución de nuevos rasgos. Esto ocurre al aumentar la robustez de la mutación y la plegabilidad de la proteína, allanando el camino para el éxito evolutivo.

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Área de la Ciencia:

  • Biología evolutiva
  • Evolución molecular

Sus antecedentes:

  • La selección natural influye en la capacidad de evolución de una población, su capacidad de evolución adaptativa.
  • Los mecanismos que vinculan la fuerza de selección con la evolutividad siguen sin estar claros.

Objetivo del estudio:

  • Investigar cómo las diferentes fuerzas de selección afectan a la evolutividad.
  • Comprender la base molecular de la evolución mejorada bajo una selección fuerte.

Principales métodos:

  • Evolución dirigida de las poblaciones de proteínas fluorescentes amarillas.
  • Aplicación de diferentes regímenes de selección (fuerte y débil) para la fluorescencia amarilla.
  • Evolución posterior hacia un fenotipo de fluorescencia verde.

Principales resultados:

  • Las poblaciones bajo fuerte selección para la fluorescencia amarilla evolucionaron la fluorescencia verde más rápido.
  • La fuerte selección promovió mutaciones que mejoran la robustez y la plegabilidad de las proteínas.
  • La selección débil favoreció inicialmente la neofuncionalización, pero fue obstaculizada por mutaciones perjudiciales.

Conclusiones:

  • La selección natural puede mejorar significativamente la evolución.
  • El aumento de la robustez y la plegabilidad son mecanismos clave mediante los cuales la selección fuerte promueve la evolución adaptativa.
  • La fuerza de la selección es un factor crítico para determinar las trayectorias evolutivas y el éxito.