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000867581 1001_ $$0P:(DE-HGF)0$$aMias-Lucquin, Dominique$$b0
000867581 245__ $$aHow the central domain of dystrophin acts to bridge F-actin to sarcolemmal lipids
000867581 260__ $$aSan Diego, Calif.$$bElsevier$$c2020
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000867581 520__ $$aDystrophin is a large intracellular protein that prevents sarcolemmal ruptures by providing a mechanical link between the intracellular actin cytoskeleton and the transmembrane dystroglycan complex. Dystrophin deficiency leads to the severe muscle wasting disease Duchenne Muscular Dystrophy and the milder allelic variant, Becker Muscular Dystrophy (DMD and BMD). Previous work has shown that concomitant interaction of the actin binding domain 2 (ABD2) comprising spectrin like repeats 11 to 15 (R11-15) of the central domain of dystrophin, with both actin and membrane lipids, can greatly increase membrane stiffness. Based on a combination of SAXS and SANS measurements, mass spectrometry analysis of cross-linked complexes and interactive low-resolution simulations, we explored in vitro the molecular properties of dystrophin that allow the formation of ABD2-F-actin and ABD2-membrane model complexes. In dystrophin we identified two subdomains interacting with F-actin, one located in R11 and a neighbouring region in R12 and another one in R15, while a single lipid binding domain was identified at the C-terminal end of R12. Relative orientations of the dystrophin central domain with F-actin and a membrane model were obtained from docking simulation under experimental constraints. SAXS-based models were then built for an extended central subdomain from R4 to R19, including ABD2. Overall results are compatible with a potential F-actin/dystrophin/membrane lipids ternary complex. Our description of this selected part of the dystrophin associated complex bridging muscle cell membrane and cytoskeleton opens the way to a better understanding of how cell muscle scaffolding is maintained through this essential protein.
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000867581 7001_ $$0P:(DE-HGF)0$$aDos Santos Morais, Raphael$$b1
000867581 7001_ $$0P:(DE-HGF)0$$aChéron, Angélique$$b2
000867581 7001_ $$0P:(DE-HGF)0$$aLagarrigue, Mélanie$$b3
000867581 7001_ $$0P:(DE-HGF)0$$aWinder, Steve J.$$b4
000867581 7001_ $$0P:(DE-HGF)0$$aChenuel, Thomas$$b5
000867581 7001_ $$0P:(DE-HGF)0$$aPérez, Javier$$b6
000867581 7001_ $$0P:(DE-Juel1)130507$$aAppavou, Marie-Sousai$$b7
000867581 7001_ $$0P:(DE-HGF)0$$aMartel, Anne$$b8
000867581 7001_ $$0P:(DE-HGF)0$$aAlviset, Guillaume$$b9
000867581 7001_ $$0P:(DE-HGF)0$$aLe Rumeur, Elisabeth$$b10
000867581 7001_ $$0P:(DE-HGF)0$$aCombet, Sophie$$b11
000867581 7001_ $$0P:(DE-HGF)0$$aHubert, Jean-François$$b12
000867581 7001_ $$0P:(DE-HGF)0$$aDelalande, Olivier$$b13$$eCorresponding author
000867581 773__ $$0PERI:(DE-600)1469822-5$$a10.1016/j.jsb.2019.107411$$gp. 107411 -$$p107411 -$$tJournal of structural biology$$v209$$x1047-8477$$y2020
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