CARP interacts with titin at a unique helical N2A sequence and at the domain Ig81 to form a structured complex

The cardiac ankyrin repeat protein (CARP) is up-regulated in the myocardium during cardiovascular disease and in response to mechanical or toxic stress. Stress-induced CARP interacts with the N2A spring region of the titin filament to modulate muscle compliance. We characterize the interaction betwe...

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Hauptverfasser: Zhou, Tiankun (VerfasserIn) , Bogomolovas, Julius (VerfasserIn) , Labeit, Siegfried (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2 September 2016
In: FEBS letters
Year: 2016, Jahrgang: 590, Heft: 18, Pages: 3098-3110
ISSN:1873-3468
DOI:10.1002/1873-3468.12362
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1002/1873-3468.12362
Verlag, Volltext: http://febs.onlinelibrary.wiley.com/doi/abs/10.1002/1873-3468.12362
Volltext
Verfasserangaben:Tiankun Zhou, Jennifer R. Fleming, Barbara Franke, Julius Bogomolovas, Igor Barsukov, Daniel J. Rigden, Siegfried Labeit and Olga Mayans

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520 |a The cardiac ankyrin repeat protein (CARP) is up-regulated in the myocardium during cardiovascular disease and in response to mechanical or toxic stress. Stress-induced CARP interacts with the N2A spring region of the titin filament to modulate muscle compliance. We characterize the interaction between CARP and titin-N2A and show that the binding site in titin spans the dual domain UN2A-Ig81. We find that the unique sequence UN2A is not structurally disordered, but that it has a stable, elongated α-helical fold that possibly acts as a constant force spring. Our findings portray CARP/titin-N2A as a structured node and help to rationalize the molecular basis of CARP mechanosensing in the sarcomeric I-band. 
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