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Synthesis of hyaluronate in differentiated teratocarcinoma cells. Characterization of the synthase.
Prehm P
.
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Differentiation of teratocarcinoma cells led to induction of hyaluronate synthesis. The synthase was recovered in the membrane fraction of cell lysates. Hyaluronate was synthesized at the membranes and was then released as a soluble product. The synthase could be stimulated by a variety of phosphate esters which prevented the degradation of the substrates UDP-GlcNAc and UDP-GlcA and the release of the growing hyaluronic acid chain from the membrane. Hyaluronidases or oligosaccharides derived from hyaluronate did not affect the synthesis. The chains grew at a rate of 60 repeating units/min. Continuous new chain initiation occurred during prolonged synthesis. Digestion of pulse-chase-labelled hyaluronate with beta-N-acetylglucosaminidase and beta-glucuronidase showed that the chains grew at the reducing end.
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