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Electrostatic contacts in the activator protein-1 coiled coil enhance stability predominantly by decreasing the unfolding rate

Mason, Jody M (2009) 'Electrostatic contacts in the activator protein-1 coiled coil enhance stability predominantly by decreasing the unfolding rate.' FEBS Journal, 276 (24). pp. 7305-7318. ISSN 1742-464X

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Abstract

The hypothesis is tested that Jun-Fos activator protein-1 coiled coil interactions are dominated during late folding events by the formation of intricate intermolecular electrostatic contacts. A previously derived cJun-FosW was used as a template as it is a highly stable relative of the wild-type cJun-cFos coiled coil protein (thermal melting temperature = 63 degrees C versus 16 degrees C), allowing kinetic folding data to be readily extracted. An electrostatic mutant, cJun(R)-FosW(E), was created to generate six Arg-Glu interactions at e-g'+1 positions between cJun(R) and FosW(E), and investigations into how their contribution to stability is manifested in the folding pathway were undertaken. The evidence now strongly indicates that the formation of interhelical electrostatic contacts exert their effect predominantly on the coiled coil unfolding/dissociation rate. This has major implications for future antagonist design whereby kinetic rules could be applied to increase the residency time of the antagonist-peptide complex, and therefore significantly increase the efficacy of the antagonist.

Item Type: Article
Uncontrolled Keywords: activator protein-1; coiled coils; electrostatic interactions; protein design; protein folding
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 06 Oct 2011 12:04
Last Modified: 16 Dec 2014 11:20
URI: http://repository.essex.ac.uk/id/eprint/852

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