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- W2017395222 abstract ": Some biochemical and biophysical properties of the scrapie agent in a partially purified fraction P5 from murine spleen are described in this communication. The agent was stable in the nonionic detergents Triton X-100 and Nonidet P40 and stable in the nondenaturing, anionic detergents sodium cholate and sodium N-lauroyl sarcosinate. In contrast, sodium dodecyl sulfate (SDS) inactivated the agent at high concentrations (1% or >) when the detergent-to-protein ratio approached 1.5 g SDS/g protein. The agent was resistant to inactivation by nucleases and proteases, even in the presence of 0.1% SDS. A broad peak of infectivity was exhibited in modified colloidal silica (Percoll) density gradients. Maximal titers were found at a Percoll density of 1.10 g/cm3 in the presence and absence of 0.05% SDS. Gel electrophoresis of the agent in the presence of 0.1% SDS resulted in inactivation of >95% of the agent loaded onto the gel. Free-flow electrophoresis showed that >99% of the agent in fraction P5 migrated toward the anode, but not as a discrete species. Sedimentation analysis of the agent in fraction P5 in the presence of 1% lysolecithin showed that the agent has a sedimentation coefficient of <300S but >30S. Heating P5 preparations caused the agent to associate with cellular elements and form aggregates with sedimentation coefficients >10,000S. Removal by differential centrifugation of the large forms of the agent produced upon heating permitted characterization of a discrete subpopulation of scrapie agent particles. Rate-zonal sucrose gradient studies showed that >>95% of the infectivity in this subpopulation sedimented as uniform particles with a sedimentation coefficient of 240S." @default.
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- W2017395222 date "1980-09-01" @default.
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- W2017395222 title "Experimental Scrapie in the Mouse: Electrophoretic and Sedimentation Properties of the Partially Purified Agent" @default.
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- W2017395222 doi "https://doi.org/10.1111/j.1471-4159.1980.tb03693.x" @default.
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