A redundant role of human thyroid peroxidase propeptide for cellular, enzymatic, and immunological activity.

ABSTRACT:

Background

Thyroid peroxidase (TPO) is a dimeric membrane-bound enzyme of thyroid follicular cells, responsible for thyroid hormone biosynthesis. TPO is also a common target antigen in autoimmune thyroid disease (AITD). With two active sites, TPO is an unusual enzyme, and thus there is much interest in understanding its structure and role in AITD. Homology modeling has shown TPO to be composed of different structural modules, as well as a propeptide sequence. During the course of studies to obtain homogeneous preparations of recombinant TPO for structural studies, we investigated the role of the large propeptide sequence in TPO.

Methods

An engineered recombinant human TPO preparation expressed in Chinese hamster ovary (CHO) cells lacking the propeptide (TPOΔpro; amino acid r

SUBMITTER: Godlewska M 

PROVIDER: S-EPMC3926150 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature