Dynamics of tropomyosin in muscle fibers as monitored by saturation transfer EPR of bi-functional probe.

Rayes, Roni F and Kálai, Tamás and Hideg, Kálmán and Geeves, Michael A. and Fajer, Piotr G (2011) Dynamics of tropomyosin in muscle fibers as monitored by saturation transfer EPR of bi-functional probe. PLoS ONE, 6 (6). e21277. ISSN 1932-6203. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1371/journal.pone.0021277

Abstract

The dynamics of four regions of tropomyosin was assessed using saturation transfer electron paramagnetic resonance in the muscle fiber. In order to fully immobilize the spin probe on the surface of tropomyosin, a bi-functional spin label was attached to i,i+4 positions via cysteine mutagenesis. The dynamics of bi-functionally labeled tropomyosin mutants decreased by three orders of magnitude when reconstituted into "ghost muscle fibers". The rates of motion varied along the length of tropomyosin with the C-terminus position 268/272 being one order of magnitude slower then N-terminal domain or the center of the molecule. Introduction of troponin decreases the dynamics of all four sites in the muscle fiber, but there was no significant effect upon addition of calcium or myosin subfragment-1.

Item Type: Article
Subjects: Q Science > QP Physiology (Living systems) > QP517 Biochemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: Sue Davies
Date Deposited: 11 Nov 2011 16:04
Last Modified: 20 May 2014 15:40
Resource URI: http://kar.kent.ac.uk/id/eprint/28342 (The current URI for this page, for reference purposes)
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