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1. Whole tissue preparations and subcellular fractions from embryonic chicken cartilage were used to measure the rate of incorporation of inorganic sulphate into chondroitin sulphate in vitro. 2. In cartilage from 14-day-old embryos, [(35)S]sulphate is incorporated to an equal extent into chondroitin 4-sulphate and chondroitin 6-sulphate at a rate of 1.5nmoles of sulphate/hr./mg. dry wt. of cartilage. 3. Microsomal and soluble enzyme preparations from embryonic cartilage catalyse the transfer of sulphate from adenosine 3'-phosphate 5'-sulphatophosphate into both chondroitin 4-sulphate and chondroitin 6-sulphate. 4. The effects of pH, ionic strength, adenosine 3'-phosphate 5'-sulphatophosphate concentration and acceptor chondroitin sulphate concentration on the soluble sulphotransferase activity were examined. These factors all influence the activity of the sulphotransferase, and pH and incubation time also influence the percentage of chondroitin 4-sulphate formed.

The sulphation of chondroitin sulphate in embryonic chicken cartilage