Publikation: Titin UN2A Acts as a Stable, Non‐Polymorphic Scaffold in its Binding to CARP
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Abstract The N2A segment of titin functions as a pivotal hub for signal transduction and interacts with various proteins involved in structural support, chaperone activities, and transcriptional regulation. Notably, the “unique N2A” (UN2A) subdomain has been shown to interact with the stress‐regulated cardiac ankyrin repeat protein (CARP), which contributes to the regulation of sarcomeric stiffness. Previously, the UN2A domain's three‐dimensional structure was modelled based on its secondary structure content identified by NMR spectroscopy, considering the domain in isolation. In this study, we report experimental long‐range distance distributions by electron paramagnetic resonance (EPR) spectroscopy between the three helixes within the UN2A domain linked to the immunoglobulin domain I81 in the presence and absence of CARP. The data confirm the central three‐helix bundle fold of UN2A and show that this adopts a compact and stable conformation in absence of CARP. After binding to CARP, no significant conformational change was observed, suggesting that the UN2A domain retains its structure upon binding to CARP thereby, mediating the interaction approximately as a rigid‐body.
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STEHLE, Juliane, Jennifer R. FLEMING, Piera-Maria BAUER, Olga MAYANS, Malte DRESCHER, 2023. Titin UN2A Acts as a Stable, Non‐Polymorphic Scaffold in its Binding to CARP. In: ChemBioChem. Wiley. 2023, 24(19), e202300408. ISSN 1439-4227. eISSN 1439-7633. Available under: doi: 10.1002/cbic.202300408BibTex
@article{Stehle2023-08-11Titin-69014, year={2023}, doi={10.1002/cbic.202300408}, title={Titin UN2A Acts as a Stable, Non‐Polymorphic Scaffold in its Binding to CARP}, number={19}, volume={24}, issn={1439-4227}, journal={ChemBioChem}, author={Stehle, Juliane and Fleming, Jennifer R. and Bauer, Piera-Maria and Mayans, Olga and Drescher, Malte}, note={Article Number: e202300408} }
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