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Default Proline Peptide Bond Isomerization in Ubiquitin under Folding and Denaturing Conditions by Pressure-Jump NMR

Proline Peptide Bond Isomerization in Ubiquitin under Folding and Denaturing Conditions by Pressure-Jump NMR

Proline isomerization is widely recognized as a kinetic bottleneck in protein folding, amplified for proteins rich in Pro residues. We introduced repeated hydrostatic pressure jumps between native and pressure-denaturing conditions inside an NMR sample cell to study proline isomerization in the pressure-sensitized L50A ubiquitin mutant. Whereas in two unfolded heptapeptides, X-Pro peptide bonds isomerized ca 1.6-fold faster at 1 bar than at 2.5 kbar, for ubiquitin ca eight-fold faster...

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