Formation of thyroid hormone revealed by a cryo-EM structure of native bovine thyroglobulin

Nils Marechal (1, 2) , Banyuhay P. Serrano , Xinyan Zhang , Charles J. Weitz

1 IGBMC - Institut de Génétique et de Biologie Moléculaire et Cellulaire
2 IGBMC - Institut de génétique et biologie moléculaire et cellulaire

Thyroid hormones are essential regulators of metabolism, development, and growth. They are formed from pairs of iodinated tyrosine residues within the precursor thyroglobulin (TG), a 660-kDa homodimer of the thyroid gland, by an oxidative coupling reaction. Tyrosine pairs that give rise to thyroid hormones have been assigned within the structure of human TG, but the process of hormone formation is poorly understood. Here we report a ~3.3-Å cryo-EM structure of native bovine TG with nascent thyroid hormone formed at one of the predicted hormonogenic sites. Local structural rearrangements provide insight into mechanisms underlying thyroid hormone formation and stabilization.

Domaines: Biochimie, Biologie Moléculaire

Nils Marechal, Banyuhay P. Serrano, Xinyan Zhang, Charles J. Weitz. Formation of thyroid hormone revealed by a cryo-EM structure of native bovine thyroglobulin. Nature Communications, 2022, 13 (1), ⟨10.1038/s41467-022-30082-4⟩. ⟨hal-04222055⟩