Structural Insights on the Obscurin-Binding Domains in Titin

Title:Structural Insights on the Obscurin-Binding Domains in Titin

Volume: 25 Issue: 11

Author(s): Allyn G. Letourneau and Nathan T. Wright*

Affiliation:

• Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, VA,United States

Keywords: Distal muscular dystrophy, titin, obscurin, solution NMR, high-resolution structure, muscle development.

Abstract: Introduction: The giant muscular proteins titin and obscurin bind to each other at the Zdisk during muscle development. This binding event is mediated through two domains from each protein: ZIg9/10 from titin and Ig58/59 from obscurin. This interaction helps stabilize and organize the sarcomere; ablation of this binding leads to muscular dystrophy.

Objective: Here we solve the high-resolution solution structure of titin ZIg10 and further delineate which sections of titin bind to obscurin.

Materials and Methods: Solution NMR, Circular Dichroism, and SEC-MALS were used to biophysically characterize the titin domains involved in this titin-obscurin interaction.

Results and Conclusion: We present the high-resolution solution structure of titin ZIg10. Additionally, we show that titin ZIg9 drives the titin-obscurin interaction, while ZIg10 does not actively participate in the titin-obscurin interaction but instead acts to stabilize ZIg9.

Cite this article as:

Letourneau G. Allyn and Wright T. Nathan *, Structural Insights on the Obscurin-Binding Domains in Titin, Protein & Peptide Letters 2018; 25 (11) . https://dx.doi.org/10.2174/0929866525666181004102031

DOI https://dx.doi.org/10.2174/0929866525666181004102031	Print ISSN 0929-8665
Publisher Name Bentham Science Publisher	Online ISSN 1875-5305