Cryo-EM structure of native human thyroglobulin

Ricardo Adaixo, Eva M. Steiner, Ricardo D. Righetto, Alexander Schmidt, Henning Stahlberg () and Nicholas M. I. Taylor ()
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Ricardo Adaixo: University of Basel
Eva M. Steiner: University of Copenhagen
Ricardo D. Righetto: University of Basel
Alexander Schmidt: University of Basel
Henning Stahlberg: University of Basel
Nicholas M. I. Taylor: University of Copenhagen

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The thyroglobulin (TG) protein is essential to thyroid hormone synthesis, plays a vital role in the regulation of metabolism, development and growth and serves as intraglandular iodine storage. Its architecture is conserved among vertebrates. Synthesis of triiodothyronine (T3) and thyroxine (T4) hormones depends on the conformation, iodination and post-translational modification of TG. Although structural information is available on recombinant and deglycosylated endogenous human thyroglobulin (hTG) from patients with goiters, the structure of native, fully glycosylated hTG remained unknown. Here, we present the cryo-electron microscopy structure of native and fully glycosylated hTG from healthy thyroid glands to 3.2 Å resolution. The structure provides detailed information on hormonogenic and glycosylation sites. We employ liquid chromatography–mass spectrometry (LC-MS) to validate these findings as well as other post-translational modifications and proteolytic cleavage sites. Our results offer insights into thyroid hormonogenesis of native hTG and provide a fundamental understanding of clinically relevant mutations.

Date: 2022
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DOI: 10.1038/s41467-021-27693-8

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