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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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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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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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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Protein folding by the CCT/TRiC chaperone complex.

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The chaperonin-containing TCP-1 (CCT) complex, or TRiC, is vital for folding many eukaryotic proteins, including actin and tubulin. Recent cryo-EM studies reveal its specific mechanisms for recognizing and folding diverse substrates.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • The chaperonin-containing TCP-1 (CCT) complex, also known as TRiC, is a crucial molecular chaperone in eukaryotes.
  • It plays a significant role in folding a large fraction of the proteome, including essential cytoskeletal proteins like actin and tubulin.
  • CCT is also involved in folding proteins that adopt a β-propeller conformation.

Purpose of the Study:

  • To review recent advances in understanding CCT's substrate-specific folding mechanisms.
  • To highlight how structural insights from cryo-electron microscopy (cryo-EM) have illuminated CCT's functions.
  • To emphasize the structural basis for CCT's recognition and folding of diverse protein substrates.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of data from cryo-electron microscopy (cryo-EM) studies.
  • Focus on structural biology and mechanistic insights into protein folding.

Main Results:

  • Cryo-EM has provided high-resolution structural data of the CCT complex.
  • These structures reveal specific interactions between CCT and its client proteins.
  • Understanding of how CCT's unique structural features facilitate substrate binding and folding has advanced.

Conclusions:

  • CCT's structural intricacies are key to its ability to fold a wide array of proteins.
  • Recent structural studies have significantly enhanced our knowledge of CCT's chaperone activity.
  • Further research into CCT mechanisms can inform therapeutic strategies for protein misfolding diseases.