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Intrinsic vs Environment Driven Equilibrium Folding Transitions in GTPase Effector Domain of Dynamin: NMR Insights

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Relative importance of the intrinsic properties of the polypeptide chain vis-a-vis the environmental influences, in driving the folding of a protein, has been a subject of extensive debate and investigation. Folding/misfolding lead to self association in many systems, which have biological functional significance. We compare here, the NMR derived equilibrium folding transitions driven under different environmental conditions in the GTPase Effector Domain of dynamin, which self-associates into megadalton size species. We conclude that though hierarchy of folding and association of GED is substantially influenced by the solvents, these properties, to a good extent are also driven by intrinsic properties of the polypeptide chain, and the regions that form secondary structures, the types of secondary structures formed in those regions, and finally the regions that participate in the self-association are the same, indicating near neighbor interactions would have a telling effect on the final outcome of the folding process. These observations would open a new reliable frontier for elucidating the multiple folding trajectories and consequent self-association, by simulations in vacuum, for this protein.
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Keywords: Association; Chemical denaturation; GTPase effector domain; biochemical signals; denatured state; dimethyl sulfoxide; folding landscape; guanidine-hydrochloride; nuclear magnetic resonance; polypeptide chain

Document Type: Research Article

Publication date: 2012-12-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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