Increases in misfolded prion protein PrPSC into aggregates in real-time can be measured when PrPC binds to PrPSC and is then misfolded into PrPSC, because an added dye only fluoresces when bound to PrPSC

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Increases in misfolded prion protein PrPSC into aggregates in real-time can be measured when PrPC binds to PrPSC and is then misfolded into PrPSC, because an added dye only fluoresces when bound to PrPSC

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The statement concerns monitoring the real-time increase of misfolded prion protein PrPSC as it aggregates, by observing fluorescence from a dye that only fluoresces when bound to PrPSC after PrPC is transformed.
Option 1 (True): This explanation aligns with assays that couple the binding and misfolding process to a fluorescent readout, where the dye remains nonfluorescent until it associates with the misfolded PrPSC aggregates, enabling real-time detection of aggregation kinetics. The mechanism described—PrPC binding to PrPSC and being misfolded, with fluorescence signaling the presence of PrPSC—fits the conceptual framework of structure-based dye reporters used to track aggregation stages. In short, the fluorescence increase corresponds to the formation of PrPSC aggregates that the dye can recognize and bind to.
Option 2 (False): If this were false, one would expect that either the dye would fluoresce independently of PrPSC binding, or that the assay reports on something other than PrPSC aggregation (for example, nondiscriminately binding to PrPC or other species). However, the statement specifies that fluorescence occurs only when bound to PrPSC, which is essential for attributing the signal to PrPSC aggregation. Therefore, a claim that this setup cannot measure real-time PrPSC aggregation or that fluorescence does not specifically report PrPSC would be inconsistent with the described mechanism. The concern here would be about the dye’s specificity or potential off-target fluorescence, but that would contradict the premise that fluorescence is contingent on PrPSC binding.
In summary, the core idea is that the fluorescence signal arises from dye interactions with PrPSC aggregates formed by the templated misfolding of PrPC, allowing real-time monitoring of the aggregation process. If the dye truly fluoresces only upon PrPSC binding, the approach is conceptually sound for tracking aggregation dynamics; if either the binding specificity or real-time readout were incorrect, the method would not faithfully report PrPSC aggregation kinetics.

01:146:447:01 CLINICAL NEUROBIO CN F25 Exam 1

Increases in misfolded prion protein PrPSC into aggregates in real-time can be measured when PrPC binds to PrPSC and is then misfolded into PrPSC, because an added dye only fluoresces when bound to PrPSC

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