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Related Experiment Video

Updated: Apr 2, 2026

Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles

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Published on: June 25, 2018

Analysis of Linked Equilibria.

JiaBei Lin¹, Aaron L Lucius¹

¹Department of Chemistry, The University of Alabama at Birmingham, Birmingham, Alabama, USA.

Methods in Enzymology

|September 29, 2015

Summary

The study investigates ATPases associated with diverse cellular activities (AAA+), focusing on Escherichia coli ClpA and ClpB. Researchers determined self-association constants to understand nucleotide binding

Keywords:

AAA+ motors Analytical ultracentrifugation Assembly Global analysis Kinetics Ligand-linked assembly Macromolecular assembly Motor proteins Sedimentation velocity Thermodynamics

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Area of Science:

Biochemistry
Molecular Biology
Protein Dynamics

Background:

ATPases associated with diverse cellular activities (AAA+) are crucial protein superfamilies.
Many AAA+ proteins, including E. coli ClpA and ClpB, require nucleotide binding for hexameric assembly.
ClpA and ClpB exist in an equilibrium of monomer, dimer, tetramer, and hexamer states, linked to nucleotide binding.

Purpose of the Study:

To investigate the self-association properties of E. coli ClpA and ClpB.
To establish a baseline for analyzing nucleotide-dependent assembly mechanisms.
To compare the assembly kinetics of ClpA and ClpB.

Main Methods:

Determining self-association constants in the absence of nucleotides.
Utilizing analytical ultracentrifugation for assembly analysis.

Main Results:

Established a strategy for quantifying self-association constants.
Identified distinct assembly kinetics between ClpA and ClpB.
Thermodynamic linkage between nucleotide binding and oligomeric state equilibrium.

Conclusions:

Self-association constants provide a foundation for understanding nucleotide-mediated assembly.
Kinetic differences between ClpA and ClpB highlight unique functional mechanisms.
Further analysis will elucidate the role of nucleotide binding in AAA+ protein assembly.