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Título:
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The energy cost of polypeptide knot formation and its folding consequences
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Autores:
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Bustamante, Andrés ;
Sotelo-Campos, Juan ;
Guerra, Daniel G. ;
Floor, Martin ;
Wilson, Christian A. M. ;
Bustamante, Carlos ;
Báez, Mauricio
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Tipo de documento:
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texto impreso
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Editorial:
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Nature Research, 2019-01-25T16:03:21Z
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Nota general:
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info:eu-repo/semantics/restrictedAccess
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
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Idiomas:
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Inglés
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Palabras clave:
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Editados por otras instituciones
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Artículos
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Artículos en revistas indizadas
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Resumen:
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Knots are natural topologies of chains. Yet, little is known about spontaneous knot formation in a polypeptide chain-an event that can potentially impair its folding-and about the effect of a knot on the stability and folding kinetics of a protein. Here we used optical tweezers to show that the free energy cost to form a trefoil knot in the denatured state of a polypeptide chain of 120 residues is 5.8?±?1?kcal?mol-1. Monte Carlo dynamics of random chains predict this value, indicating that the free energy cost of knot formation is of entropic origin. This cost is predicted to remain above 3?kcal?mol-1 for denatured proteins as large as 900 residues. Therefore, we conclude that naturally knotted proteins cannot attain their knot randomly in the unfolded state but must pay the cost of knotting through contacts along their folding landscape.
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En línea:
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http://doi.org/10.1038/s41467-017-01691-1
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