STUDIES ON BIOSYNTHESIS OF THE LINKAGE REGION OF CHONDROITIN SULFATE-PROTEIN COMPLEX

Abstract
A cell-free preparation from embryonic chick cartilage catalyzes the incorporation of xylose-C14 and galactose-c14 from the corresponding UDP derivatives into TCA [ trichloroacetic acid]-preciptable material. The xylose is incorporated without modification and can be entirely solubilized by treatment with alkaline borohydride yielding xylitol-C14. Xylosyl-C14-serine was isolated after extensive proteolytic digestion. Free galactose-C-14 can be recovered following acid and B-galactosidase hydrolysis of radioactive products isolated by alkali treatment of gal-actose-C14-labeled TCA precipitates. It is proposed that these results reflect the biosynthesis of the linkage region of CS [chondroitin sulfate] to protein.

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