Collective fluctuations in ordered fluids investigated by two-dimensional electron-electron double resonance spectroscopy

Article Abstract:

A theory is developed for the effects of director fluctuations on the autopeaks in the two-dimensional electron-electron double resonance (2D-ELDOR) experiment by using an analytical solution of the stochastic Liouville equation for which the director field is treated as a multidimensional Gaussian process. The analysis has established 2D-ELDOR as a useful method to study the elastic properties of biological membranes.

United States, Observations, Electron paramagnetic resonance spectroscopy, Electron-electron interactions

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Activation energy of catalysis-related domain motion in E. coli adenylate kinase

Article Abstract:

Activation energy of catalysis related domain motion in adenylate kinase from E. coli (AKeco) was studied. AKeco prevails in the solution in the temperature range of 288-310K as a Brownian sphere hydrated with monolayers of bound water and tumbling with activation energy of 16.9 kJ/mol and the kinase catalysis appears not to be controlled by domain motion in the ligand-free enzyme.

Escherichia coli, Adenylate kinase

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