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. 1988 May;7(5):1421–1429. doi: 10.1002/j.1460-2075.1988.tb02959.x

Processing at immunoglobulin polyadenylation sites in lymphoid cell extracts.

A Virtanen 1, P A Sharp 1
PMCID: PMC458392  PMID: 2900759

Abstract

We have developed an in vitro system for polyadenylation of RNA substrates in cell-free nuclear extracts prepared from murine cells of lymphoid origin. RNA substrates containing the adenovirus L3, murine immunoglobulin (IgM) secreted and membrane polyadenylation sites were accurately polyadenylated in these extracts. Kinetic analysis showed that the rate of polyadenylation in vitro responds proportionally to the substrate concentration. Quantitation of the initial rate of polyadenylation at the three sites permitted comparison of the activities of extracts prepared from HeLa cells, B cells (Wehi 231) and plasmacytoma cells (P9.37.11). From this analysis, we concluded that in all three extracts the polyadenylation activity at the L3 site was higher than that of either of the IgM sites. In contrast to the preferential utilization of the secreted site in vivo in plasmacytomas, this site was not selectively processed in plasmacytoma as compared to B cell extracts. The efficiency of polyadenylation at both IgM sites in the plasmacytoma extract was significantly lower than that in the B cell extract. The common low activity at the IgM sites in the plasmacytoma cell extract suggests that the rate-limiting step for polyadenylation at these two sites differs from that at the L3 site.

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