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. 1975 May;122(2):719–726. doi: 10.1128/jb.122.2.719-726.1975

Endogenous messenger ribonucleic acid-directed polypeptide chain elongation in a cell-free system from the yeast Saccharomyces cerevisiae.

B M Gallis, E T Young
PMCID: PMC246111  PMID: 1092665

Abstract

An in vitro protein-synthesizing system from the yeast Saccharomyces cerevisiae has been made by a modification of the procedure for preparation of the Krebs ascites system. The protein synthetic activity is directed by endogenous messenger. Amino acid incorporation occurs over a broad range of magnesium and potassium concentration, being maximal at 6 and 85 mM, respcetively. The activity of this in vitro system is due to the elongation of polypeptides whose synthesis was initiated in vivo. The cell extract does not initiate synthesis with endogenous messenger ribonucleic acid (RNA), since 1 muM pactamycin, which blocks initiation on prokaryotic or eukaryotic ribosomes invitro, fails to decrease amino acid incorporation. Ten micromolar cycloheximide, however, inhibits incorporation by 87%. Moreover, this system is not stimulated by rabbit reticulocyte polysomal RNA, which directs the synthesis of hemoglobin in extracts of Krebs ascites cells. The translation of this messenger is not masked by high endogenous incorporation, because autoradiography of sodium dodecyl sulfate-polyacrylamide gels containing [35-S]methionine-labeled products shows that no hemoglobin is made. Preincubation of this system, which reduces the high endogenous incorporation by 80%, does not increase its capacity to be stimulated by either rabbit reticulocyte RNA or yeast polyriboadenylic acid-containing RNA. Polyuridylic acid, however, does stimulate polyphenylalanine incorporation. The failure of the yeast lysate to be stimulated by or to translate added natural messenger RNA, its insensitivity to low levels of pactamycin but inhibition by cycloheximide, and its relatively high magnesium optimum (the same as that for polyuridylic acid) suggest that it elongates but does not initiate polypeptide chains.

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Selected References

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