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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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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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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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Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase
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Co-translational protein folding: progress and methods.

Michael Thommen1, Wolf Holtkamp1, Marina V Rodnina1

  • 1Department of Physical Biochemistry, Max Planck Institute for Biophysical Chemistry, Goettingen 37077, Germany.

Current Opinion in Structural Biology
|December 13, 2016
PubMed
Summary
This summary is machine-generated.

Protein folding begins during synthesis, guided by the ribosome and translation speed. New methods can explore this crucial co-translational folding process and its challenges.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • Proteins fold into functional 3D structures after synthesis.
  • Folding can initiate while the protein is still being synthesized on the ribosome (co-translational folding).
  • The ribosome's exit tunnel and translation speed influence this early folding.

Purpose of the Study:

  • To investigate the timing and mechanisms of co-translational protein folding.
  • To understand the ribosome's role in guiding nascent peptide folding.
  • To explore how translation kinetics affect protein structure formation.

Main Methods:

  • Suggests novel structural and biophysical approaches.
  • Proposes methods to probe ribosome-peptide interactions.
  • Highlights techniques to analyze translation kinetics and folding.

Main Results:

  • Co-translational folding is influenced by the ribosome environment.
  • Translation elongation rate plays a key role in guiding protein structure.
  • The interplay between the ribosome and nascent peptide is critical.

Conclusions:

  • Novel structural and biophysical techniques are essential for studying co-translational folding.
  • Understanding this process is key to deciphering protein function and cellular processes.
  • Future research should focus on the dynamic interplay during protein synthesis.