PMID: 6108214Sep 1, 1980Paper

Utilization of polyadenylate mRNA during growth and starvation in Physarum polycephalum

European Journal of Biochemistry
A J Brown, N Hardman

Abstract

The effect of growth on the efficiency of utilization of poly(A)-containing mRNA for translation has been investigated in microplasmodia of Physarum polycephalum. Measurement of the relative proportions of poly(A)-rich mRNA in polysomal and post-polysomal fractions isolated by sucrose density gradient centrifugation reveals that newly synthesized poly(A)-rich mRNA is present in increasing proportions in the polysomal region during exponential growth. However, the proportion of long-lived poly(A)-rich mRNA observed in actively-translating polysomes declines as starvation approaches. The ribonuclease content and morphology of the microplasmodia were monitored during growth and starvation in an effort to related this phenomenon to the onset of spherulation.

References

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