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Related Concept Videos

Protein Folding01:25

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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.
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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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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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Updated: Nov 27, 2025

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Selection enhances protein evolvability by increasing mutational robustness and foldability.

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
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Stronger natural selection enhances a population's evolvability, accelerating the evolution of new traits. This occurs by increasing mutation robustness and protein foldability, paving the way for evolutionary success.

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Area of Science:

  • Evolutionary biology
  • Molecular evolution

Background:

  • Natural selection influences a population's evolvability, its capacity for adaptive evolution.
  • Mechanisms linking selection strength to evolvability remain unclear.

Purpose of the Study:

  • To investigate how varying selection strengths impact evolvability.
  • To understand the molecular basis of enhanced evolvability under strong selection.

Main Methods:

  • Directed evolution of yellow fluorescent protein populations.
  • Application of different selection regimes (strong vs. weak) for yellow fluorescence.
  • Subsequent evolution towards a green fluorescence phenotype.

Main Results:

  • Populations under strong selection for yellow fluorescence evolved green fluorescence faster.
  • Strong selection promoted mutations enhancing robustness and protein foldability.
  • Weak selection initially favored neofunctionalization but was hindered by deleterious mutations.

Conclusions:

  • Natural selection can significantly enhance evolvability.
  • Increased robustness and foldability are key mechanisms by which strong selection promotes adaptive evolution.
  • Selection strength is a critical factor in determining evolutionary trajectories and success.