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Structural Insights on the Obscurin-Binding Domains in Titin.
Protein and Peptide Letters 2018 October 4
INTRODUCTION: The giant muscular proteins titin and obscurin bind to each other at the Z-disk 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.
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.
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