Taurine biosynthesis cysteamine pathway

However, as far as the biosynthesis is considered, the cysteinesulfinic (CSA) pathway and the cysteamine pathway are considered as prevalent each tissue showing a preference for the one of the other route In this respect, it is of interest that in these both pathways the intermediate metabolite formed is hypotaurine 5 The metabolism of hypotaurine is not clearly known, although the oxidation of hypotaurine into taurine is... 

The problem of regulation is complicated by the metabolic complexity of sulfur amino acids, and the wide variation in organ taurine concentrations between species. The major putative metabolic routes to taurine from cysteine are three These involve the intermediacy respectively of cysteine sulfinic acid, cysteic acid, and cysteamine. The first two utilize the enzyme cysteine sulfinic acid decarboxylase (CSAD), and the latter the enzyme cysteamine dioxygenase (CD). The distribution of these enzymes differ both quantitatively and qualitatively in corresponding organs of various species. Other pathways of taurine biosynthesis have also been proposed. For... 

---