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- W4313490214 abstract "Caspases are evolutionarily conserved cysteinyl proteases that are integral in cell development and apoptosis. All apoptotic caspases evolved from a common ancestor into two distinct subfamilies with either monomeric (initiators) or dimeric (effectors) oligomeric states. The regulation of apoptosis is influenced by the activation mechanism of the two subfamilies, but the evolution of the well-conserved caspase-hemoglobinase fold into the two subfamilies is not well understood. We examined the folding landscape of monomeric caspases from two coral species over a broad pH range of 3 to 10.5. On an evolutionary timescale, the two coral caspases diverged from each other approximately 300 million years ago, and they diverged from human caspases about 600 million years ago. Our results indicate that both proteins have overall high stability, ∼ 15 kcal mol -1 near the physiological pH range (pH 6 to pH 8), and unfold via two partially folded intermediates, I 1 and I 2 , that are in equilibrium with the native and the unfolded state. Like the dimeric caspases, the monomeric coral caspases undergo a pH-dependent conformational change resulting from the titration of an evolutionarily conserved site. Data from molecular dynamics simulations paired with limited proteolysis and MALDI-TOF mass spectrometry show that the small subunit of the monomeric caspases is unstable and unfolds prior to the large subunit. Overall, the data suggest that all caspases share a conserved folding landscape, that a conserved allosteric site can be fine-tuned for species-specific regulation, and that the subfamily of stable dimers may have evolved to stabilize the small subunit." @default.
- W4313490214 created "2023-01-06" @default.
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- W4313490214 date "2023-01-04" @default.
- W4313490214 modified "2023-09-27" @default.
- W4313490214 title "Sequential unfolding mechanisms of monomeric caspases" @default.
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- W4313490214 doi "https://doi.org/10.1101/2023.01.04.522771" @default.
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