有三种蛋白，包括甲状腺素结合球蛋白（TBG）、甲状腺素和白蛋白，负责携带甲状腺激素甲状腺素（T4）和3，5，3’-三碘甲状腺原氨酸（T3）在血流中。该基因编码血清中主要的甲状腺激素转运蛋白TBG在基因组学上属于serpin家族，但该蛋白与serpin家族的许多其他成员一样没有抑制功能该基因突变导致TGB缺乏，根据血清TBG水平分为部分缺乏、完全缺乏和过量另外，还发现了编码不同亚型的剪接转录变体，但尚未确定这些变体的全长性质。[由RefSeq提供，2012年6月]
There are three proteins including thyroxine-binding globulin (TBG), transthyretin and albumin responsible for carrying the thyroid hormones thyroxine (T4) and 3,5,3'-triiodothyronine (T3) in the bloodstream. This gene encodes the major thyroid hormone transport protein, TBG, in serum. It belongs to the serpin family in genomics, but the protein has no inhibitory function like many other members of the serpin family. Mutations in this gene result in TGB deficiency, which has been classified as partial deficiency, complete deficiency, and excess, based on the level of serum TBG. Alternatively spliced transcript variants encoding different isoforms have been found, but the full-length nature of these variants has not been determined.[provided by RefSeq, Jun 2012]