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Multi-protein clamp loader complexes are required to load sliding clamps onto DNA. In Escherichia coli the clamp loader contains three DnaX (τ/γ) proteins, δ, and δ′, which together form an asymmetric pentameric ring that also interacts with ψχ. Here we used mass spectrometry to examine the assembly and dynamics of the clamp loader complex. We find that γ exists exclusively as a stable homotetramer,...
Protein interaction networks are becoming an increasingly important area of research within structural genomics. Here we present an ion mobility-mass spectrometry approach capable of distinguishing the overall subunit architecture of protein complexes. The approach relies on the simultaneous measurement in the gas phase of the mass and size of intact assemblies and subcomplexes. These data are then...
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