Native plasmepsin II is kinetically trapped and requires the prosegment both to catalyze folding and to shift the folding equilibrium towards the native conformation.
G indicates that the equilibrium of the folding reaction is shifted to the left: that is on average, the sequence tends to exist in an unstructured state: Unstructured ⇌ Folded ?
Studies on the ribosomal protein S6 have indicated the existence of specific, competing nuclei for a given protein fold, resulting in shifting dominant folding channels upon sequence divergence [64].
Among other approaches, small molecule synthetic chaperones have been used in order to shift the folding equilibrium of mutant proteins towards a more native state (Arakawa et al. 2006; Chaudhuri and Paul 2006; Cohen and Kelly 2003; Papp and Csermely 2006; Perlmutter 2002).
Under these conditions, where formation of the equilibrium folding intermediate is maximal,Cα shift changes indicate an increase in helicity at the N-terminus of the H helix (residues 125 129) and at the C-terminus of the G helix, in residues that contact the N-terminus of helix H in the native fold.
Solvent conditions were gradually shifted between folding and amyloidogenesis, and the properties of the energy landscape governing structure formation were reconstructed.
In this case, the vitamin acts as a chemical splint, with the ligand-binding energy shifting the folding equilibrium and thereby making up for the partial loss of free energy caused by the mutation.
Most variants showed an increased susceptibility against proteolytic attack indicating disturbed folding kinetics (i.e. shift of the folding equilibrium towards the unfolded state) and local unfolding.
This plasticity in the energy landscape may confer an evolutionary advantage over more restricted folds, and may explain why the topologically complex Ig-like domains are so prevalent when compared to more simple folds: changes in sequence that are required for functional reasons can be easily compensated for by a shift in the folding nucleus.
Oliver began accompanying Anne-Marie on her shifts at Diesel, folding shirts, examining seams, and offering customers unsolicited style advice.
