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The Journal of Cell Biology, Vol 96, 1471-1474, Copyright © 1983 by The Rockefeller University Press

ARTICLES

Nascent polypeptide chains exit the ribosome in the same relative position in both eucaryotes and procaryotes

C Bernabeu, EM Tobin, A Fowler, I Zabin and JA Lake

We located the polypeptide nascent chain as it leaves cytoplasmic ribosomes from the plant Lemna gibba by immune electron microscopy using antibodies against the small subunit of the enzyme ribulose-1,5- bisphosphate carboxylase. Similar studies with Escherichia coli ribosomes, using antibodies directed against the enzyme beta- galactosidase, show that the polypeptide nascent chain emerges in the same relative position in plants and bacteria. The eucaryotic ribosomal exit site is on the large subunit, approximately 75 A from the interface between subunits and nearly 160 A from the central protuberance, the presumed site for peptidyl transfer. This is the first functional site on both the eucaryotic and procaryotic ribosomes to be determined.
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