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SUMO-1 (1-97) is a crucial protein in the machinery of post-translational modifications. We observed by circular dichroism and fluorescence spectroscopy that urea-induced unfolding of this protein is a complex process with the possibility of occurrence of detectable intermediates along the way. The tertiary structure is completely lost around ∼4.5 M urea with a transition mid-point at 2.53 M urea,...
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