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• W2022227414 abstract "Apoptosis is critical for organismal homeostasis and a wide variety of diseases. Caspases are the ultimate executors of the apoptotic programmed cell death pathway. As caspases play such a central role in apoptosis, there is significant demand for technologies to monitor caspase function. We recently developed a caspase activatable-GFP (CA-GFP) reporter. CA-GFP is unique due to its dark state, where chromophore maturation of the GFP is inhibited by the presence of a C-terminal peptide. Here we show that chromophore maturation is prevented because CA-GFP does not fold into the robust β-barrel of GFP until the peptide has been cleaved by active caspase. Both CA-GFP and GFP₁₋₁₀ , a split form of GFP lacking the 11th strand, have similar secondary structure, different from mature GFP. A similar susceptibility to proteolytic digestion indicates that this shared structure is not the robust, fully formed GFP β-barrel. We have developed a model that suggests that as CA-GFP is translated in vivo it follows the same folding path as wild-type GFP; however, the presence of the appended peptide does not allow CA-GFP to form the barrel of the fully matured GFP. CA-GFP is therefore held in a pro-folding intermediate state until the peptide is released, allowing it to continue folding into the mature barrel geometry. This new understanding of the structural basis of the dark state of the CA-GFP reporter will enable manipulation of this mechanism in the development of reporter systems for any number of cellular processes involving proteases and potentially other enzymes." @default.
• W2022227414 created "2016-06-24" @default.
• W2022227414 creator A5004556923 @default.
• W2022227414 creator A5056866621 @default.
• W2022227414 date "2013-01-10" @default.
• W2022227414 modified "2023-09-25" @default.
• W2022227414 title "Structural basis of fluorescence quenching in caspase activatable-GFP" @default.
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• W2022227414 doi "https://doi.org/10.1002/pro.2188" @default.
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