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Most proteins contain small cavities that can be filled by replacing cavity-lining residues by larger ones. Since shortening mutations in hydrophobic cores tend to destabilize proteins, it is expected that cavity-filling mutations may conversely increase protein stability. We have filled three small cavities in apoflavodoxin and determined by NMR and equilibrium unfolding analysis their impact in...
The structure and energetics of protein-folding intermediates are poorly understood. We have identified, in the thermal unfolding of the apoflavodoxin from Anabaena PCC 7119, an equilibrium intermediate with spectroscopic properties of a molten globule and substantial enthalpy and heat capacity of unfolding. The structure of the intermediate is probed by mutagenesis (and phi analysis) of polar residues...
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