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Summary

Protein folding intermediates can cause cellular dysfunction. This study structurally characterized a long-lived intermediate of RNase T1, revealing its interaction with the protein folding helper SlyD to prevent aggregation and facilitate folding.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Slow protein folding can lead to aggregation and cellular dysfunction.
  • Protein folding helpers, such as enzymes, have evolved to prevent aggregation and accelerate folding.
  • Understanding the mechanisms of these helpers is crucial for cellular health.

Purpose of the Study:

  • To structurally characterize a long-lived kinetic folding intermediate of RNase T1 (S54G/P55N).
  • To investigate the interaction sites between the protein folding helper enzyme SlyD(1-165) and this kinetic intermediate at residue resolution.
  • To elucidate the role of SlyD domains in facilitating protein folding catalysis.

Main Methods:

  • Time-resolved Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Real-time 3D BEST-HNCA for resonance assignment of the folding intermediate.
  • Characterization of the enzyme-substrate Michaelis-Menten complex during catalysis.

Main Results:

  • The kinetic folding intermediate of RNase T1 was structurally characterized.
  • NMR assignments allowed for residue-level investigation of SlyD interactions.
  • The interaction surface was localized to the Y38-P39 peptidyl-prolyl bond region in RNase T1.
  • SlyD interaction involved its FKBP and IF domains, highlighting domain interplay.

Conclusions:

  • SlyD effectively interacts with a specific folding intermediate of RNase T1.
  • The interaction focuses on the peptidyl-prolyl bond, crucial for isomerization catalysis.
  • SlyD utilizes both FKBP and IF domains to facilitate protein folding, demonstrating functional domain interplay.