Allostery is a fundamental concept Nature uses to regulate the affinity of a certain substrate to an active site of a protein by binding a ligand to a distant allosteric site. We will design experimental tools to gain an atomistic...
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31/07/2015
UZH
2M€
Presupuesto del proyecto: 2M€
Líder del proyecto
University of Zurich
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Financiación
concedida
El organismo FP7 notifico la concesión del proyecto
el día 2015-07-31
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Información proyecto DYNALLO
Líder del proyecto
University of Zurich
No se ha especificado una descripción o un objeto social para esta compañía.
Presupuesto del proyecto
2M€
Fecha límite de participación
Sin fecha límite de participación.
Descripción del proyecto
Allostery is a fundamental concept Nature uses to regulate the affinity of a certain substrate to an active site of a protein by binding a ligand to a distant allosteric site. We will design experimental tools to gain an atomistic understanding of the conformational transitions that give rise to allostery. We will approach the problem from two distinctively different directions. First, we will initiate conformational transitions of proteins that per se are not photoswitchable, by cross-linking two sites of an allosteric protein with a photo-switchable azobenzene-moiety to initiate a conformational transition similar to ligand binding. We will use ultrafast infrared spectroscopy to time-resolve the conformational transition. Second, we will experimentally verify a frequently expressed hypothesis that allosteric and active site communicate by exchange of vibrational energy. To that end, we will design a versatile approach that allows us to locally deposit vibrational energy at essentially any site in a protein (e.g. through pumping of an optical chromophore that undergoes ultrafast internal conversion), and to detect its appearance at any other site by using vibrational transitions as local thermometers. Thereby, we will map out a network of connectivity in a given protein. Both approaches will applied both to one and the same protein family. One concrete example are PDZ domains, which are among the smallest allosteric proteins, and for which the connection between allostery and vibrational energy flow has been made explicit, based on computer simulations. We will eventually test this hypothesis experimentally, and provide the foundation for a description of allostery that is on an equal footing as our current understanding of protein folding.