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Area of Science:

  • Molecular biology
  • Biophysics
  • Protein biochemistry

Background:

  • ClpB, an AAA+ ATPase, disaggregates toxic protein aggregates with Hsp70.
  • ClpB functions as a ring-shaped hexamer that threads substrates through its central pore.
  • The structural dynamics of ClpB during protein disaggregation remain poorly understood.

Purpose of the Study:

  • To elucidate the function-related structural dynamics of ClpB.
  • To gain mechanistic insight into the protein disaggregation process mediated by ClpB.
  • To visualize ClpB conformational changes during ATP hydrolysis.

Main Methods:

  • High-speed atomic force microscopy (HS-AFM) was employed to directly visualize ClpB.
  • HS-AFM movies captured dynamic conformational transitions of the ClpB hexamer.
  • Analysis of Walker-motif mutants and specific mutations (repressed, hyperactive) provided insights into ClpB function.

Main Results:

  • HS-AFM revealed massive conformational changes in the ClpB hexameric ring during ATP hydrolysis, including transitions to spiral and half-spiral forms.
  • ATP binding and hydrolysis were shown to be critical for ClpB oligomer formation and structural dynamics.
  • Distinct oligomeric forms were observed for repressed and hyperactive ClpB mutants.

Conclusions:

  • The study provides a comprehensive view of ATP-driven oligomeric-state transitions in ClpB.
  • These dynamic transitions are essential for ClpB's ability to disaggregate protein aggregates.
  • Visualizing ClpB's structural dynamics offers mechanistic insights into protein quality control.