The function of SULT6B1 (sulfotransferase family 6B member 1, Ensembl gene identifier ENSG00000138068) is as follows. Sulfotransferase that utilizes 3'-phospho-5'-adenylyl sulfate (PAPS) as sulfonate donor to catalyze the sulfate conjugation of thyroxine. Involved in the metabolism of thyroxine (By similarity). .