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Molecular Chaperones and Protein Folding03:00

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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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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
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The dynamic dimer structure of the chaperone Trigger Factor.

Leonor Morgado1, Björn M Burmann1,2, Timothy Sharpe1

  • 1Biozentrum, University of Basel, Klingelbergstrasse 70, 4056, Basel, Switzerland.

Nature Communications
|December 10, 2017
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Summary
This summary is machine-generated.

Trigger Factor (TF) forms a head-to-tail dimer, revealing its dynamic structure and how it interacts with client molecules. This dimer structure explains TF

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Trigger Factor (TF) is a crucial chaperone in Escherichia coli, essential for protein folding.
  • While the monomer structure of TF is known, its dimeric storage form's spatial arrangement was unclear.
  • Understanding TF's dimeric structure is key to elucidating its chaperone mechanism.

Purpose of the Study:

  • To determine the high-resolution structure of the Trigger Factor dimer.
  • To investigate the dynamics and interactions within the TF dimer.
  • To explain how the dimeric TF interacts with client molecules.

Main Methods:

  • High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Biophysical techniques to analyze protein structure and interactions.

Main Results:

  • TF forms a symmetric head-to-tail dimer.
  • The dimer involves interactions between ribosome binding and substrate binding domains.
  • The dimeric structure is highly dynamic, with conformational flexibility in the ribosome binding domains.

Conclusions:

  • The determined TF dimer structure provides insights into its storage and functional states.
  • Intermolecular interactions within the dimer explain its dynamic nature and client binding.
  • The avidity of the dimer facilitates monomerization by weakly interacting clients.