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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.
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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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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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Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo
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Unfolding the chaperone story.

F Ulrich Hartl1

  • 1Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany uhartl@biochem.mpg.de.

Molecular Biology of the Cell
|November 1, 2017
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Summary
This summary is machine-generated.

Cellular protein folding was once thought spontaneous but now requires molecular chaperones. These chaperones guide newly synthesized proteins from the ribosome to their functional shapes, revealing a complex cellular process.

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Area of Science:

  • Molecular biology
  • Cell biology
  • Biochemistry

Background:

  • Early research, based on Anfinsen's work, suggested protein folding in purified systems is spontaneous.
  • This led to limited interest in cellular protein folding mechanisms among cell biologists.
  • The understanding of protein folding shifted significantly in the mid-to-late 1980s with the discovery of molecular chaperones.

Purpose of the Study:

  • To describe the historical development of the concept of protein folding within the cell.
  • To highlight the transition from viewing protein folding as spontaneous to a chaperone-assisted process.
  • To outline the critical steps leading to the current understanding of in vivo protein folding.

Main Methods:

  • Historical review of scientific literature and discoveries.
  • Narrative description of the evolution of thought in protein folding research.
  • Focus on the emergence of molecular chaperones as key players.

Main Results:

  • Protein folding in the cellular environment (in vivo) is not spontaneous.
  • A complex machinery of molecular chaperones is essential for efficient and correct protein folding.
  • Molecular chaperones interact with nascent polypeptide chains emerging from ribosomes.

Conclusions:

  • In vivo protein folding is a highly organized, chaperone-dependent cellular process.
  • Molecular chaperones guide proteins along specific pathways to achieve their native state.
  • The discovery of chaperones revolutionized the understanding of protein biogenesis within cells.