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Electrostatic coupling leading to conformational changes in proteins is challenging to demonstrate directly, it requires that both the local, discrete electronic details and dynamic information relevant to the functional descriptions are probed. Here, as a novel study to address this challenge, the roles of an aromatic residue in influencing the functional conformational changes of a membrane receptor in its natural membrane environment are reported. Previously intractable discrete electronic details have been obtained using 2D solid-state NMR of specifically labelled receptor, reinforced with molecular dynamic simulations, mutational analysis and functional assays, supported by and compared with rigid-atom crystal structural models. Hydrogen bonding and hydrophobic interactions are identified as the mechanistic origin for direct electromechanical coupling to the dynamics of conformational changes within the receptor.

Original publication

DOI

10.1016/j.bbabio.2016.08.002

Type

Journal article

Journal

Biochim Biophys Acta

Publication Date

11/2016

Volume

1857

Pages

1786 - 1795

Keywords

Aromatic residue, Electrostatic coupling, Functional conformational change, Mutational analysis and functional assays, Solid-state NMR, Amino Acid Substitution, Bacteriorhodopsins, Halobacterium, Isomerism, Molecular Dynamics Simulation, Protein Conformation, Protons, Tyrosine