Approximate values for force constant and wave number associated with a low-frequency concerted motion in proteins can be evaluated by a comparison of X-ray structures

Article Abstract:

An approximate value for the force constant and the wave number of the low-frequency [beta]-sheet breathing motion of RNase A was calculated by employing the Boltzmann hypothesis on a set of data derived from a simple conventional structural superimposition of an unusual large number of X-ray structures available for the protein. The calculated value for the force constant associated with the breathing motion of RNase A is comparable to that describing the hinge-bending motion between the A-B and C-D dimers in the tetrameric structure of human S-adenosylhomocysteine hydrolase and the value determined for lysozyme hinge bending.

Force and energy, Forces (Physics), Wave frequency

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Orientation-resolving pulsed electron dipolar high-field EPR spectroscopy on disordered solids: I. Structure of spin-correlated radical pairs in bacterial photosynthetic reaction centers

Article Abstract:

Study is presented to demonstrate that the combination of pulsed high-field EPR spectroscopy at the W band with its extension to pulsed electron-electron double resonance (PELDOR) and relaxation -induced dipolar modulation enhancement (RIDME) offers a powerful tool for obtaining three-dimensional structure of radical-pair systems with large interspin distances.

Photosynthesis research, Electron paramagnetic resonance spectroscopy

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