Structures and ensembles of ubiquitin showing the ability of ensemble approaches to capture structural heterogeneity.
1UBQ and
1D3Z are the X-ray crystallography structure and the NMR average solution structure (
purple and
red), respectively. In
green are two ensembles of motion on the sub-
τ c timescale (<~4 ns for ubiquitin) and in
blue are two ensembles that capture supra-
τ c timescales up to ms. Below the structures is the agreement, in Hz, with experimental hydrogen bond scalar couplings that are sensitive to a molecule’s motion (small numbers are better),
a measure of structural heterogeneity, and the RMSD from the X-ray crystal structure