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• W2077389712 startingPage "8147" @default.
• W2077389712 abstract "The increased ultrasonic absorption brought about by self-assembly of biomolecules is analyzed for the assembly process from the 20S aggregate to the helical rod of tobacco mosaic virus protein in solution, designated here as the 20S --> P-helix transition. The analysis is based on theoretical developments in ultrasonic relaxation spectrometry presented previously and illustrates the possibility that this technique can be used for characterizing fluctuations. The analysis makes use of NMR data for the system in solution and of x-ray diffraction data for the closely related transition from the two-ring disk to the virion. These x-ray data comprise the high-resolution structures and the Debye-Waller temperature factors of the main chain atoms of both the two-ring disk in crystals and the virion in oriented gel form. First, reduced ultrasonic spectra are obtained for the 4S, 20S, and helical rod aggregates. The fluctuation-enhancement factor for the helical rod is determined independently of any deconvolution into normal modes of relaxation and is shown not to depend on the particular procedure of reduction employed. The increase of ultrasonic absorption in the 20S --> P-helix transition primarily reveals enhancement of the relaxing system's normal-mode volume fluctuations. The observed relaxations probably involve one conformational process per subunit. The normal-mode volume fluctuations are then estimated from a bimodal least-squares best fit to the data, and a lower bound for the reaction volume associated with the fast steps is obtained. Two mechanisms are considered as follows: (i) a destabilization process in which the free-energy difference between two states is reduced and (ii) an increase in reaction volumes of local conformation changes in the helical aggregate, resulting from the formation of a carboxyl cage-like structure and from the change in environment produced inside the cage. Increased reaction volumes would not be detected with x-ray diffraction. The possible occurrence of fluctuations at the RNA binding site raises the question of whether a quaternary structure that exhibits significant conformational fluctuations must be present for the binding of the nucleic acid." @default.
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• W2077389712 date "1986-11-01" @default.
• W2077389712 modified "2023-10-09" @default.
• W2077389712 title "Ultrasonic absorption evidence for enhanced volume fluctuations in the tobacco mosaic virus protein helical aggregate" @default.
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• W2077389712 doi "https://doi.org/10.1073/pnas.83.21.8147" @default.
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