Enzymatic Iodination of Tyrosine and Thyroglobulin with Chloroperoxidase

Enzymatic iodination of tyrosine and thyroglobulin with chloroperoxidase.

1. Crystalline chloroperoxidase is effective in catalyzing the iodination of tyrosine or thyroglobulin when supplemented with HzOz, or with the H20z-generating system, glucoseglucose oxidase. The iodination reaction is very rapid at low concentrations of iodide (5 X 10-5 M), and at low concentrations of tyrosine (1 X 10V4 M) or thyroglobulin (0.33 mg per ml). 2. Iodide is rapidly bound as 3-iod...

Iodination of Tyrosyls in Thyroglobulin

The Properties of Thyroglobulin VIII. THE IODINATION OF THYROGLOBULIN

It has been shown that when thyroglobulin is iodinated, a marked intensification occurs in its absorption spectrum in the region of 300 to 3fXl rnp in alkaline solution (1). It is also well known that the absorption peaks of iodinated tyrosine and thyronine derivatives occur in this spectral zone (2). A procedure based on these factors has been developed which permits the simultaneous determina...

Molecular parameters linking thyroglobulin iodination with autoimmune thyroiditis.

Increased iodide intake has been linked to the development of hypothyroidism and/or autoimmune thyroiditis in humans and animals, but the mechanisms involved remain poorly understood. Increased ingestion of iodide is likely to have pleiotropic effects on either metabolic or immunological processes. Within the latter domain, recent interest has been focused on two areas: a) the role of iodinated...

Relationship between iodination and the polypeptide chain composition of thyroglobulin.

Thyroglobulin was isolated from thyroid glands of normal guinea pigs and from animals treated with thiouracil. These preparations were fractionated by isopyknic centrifugation in RbCl into proteins of varying iodine content. When the disulfide bonds of these protein fractions were reduced and analyzed by polyacrylamide gel electrophoresis in Na dodecyl-SO4, t hree species were observed with mol...