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Messenger RNA for ribosomal proteins in Xenopus laevis oocytes
Abstract:
Xenopus laevis oocytes (stage II--III) incorporate [35S]methionine into ribosomal proteins identifiable by two-dimensional electrophoresis. Poly(A)-rich RNA prepared form this source has been translated in a wheat germ cell-free system. Among the products synthesized in vitro 30 are clearly identifiable as ribosomal proteins. Some are not individually resolved, whereas a few of them may lack methionine or may not be correctly processed after the synthesis in vitro. An enrichment of our mRNA preparation for ribosomal protein activity can be obtained by subsequent passages on oligo(dT)-cellulose columns and by selection of a 10--16-S fraction by sucrose gradient sedimentation. We estimate that messenger RNA for ribosomal proteins represents 10--20% of this RNA preparation and can now be utilized for molecular cloning procedures.
Insights
Researchers identified ribosomal proteins synthesized from Xenopus laevis oocyte messenger RNA using cell-free translation. This enriched mRNA, suitable for molecular cloning, represents 10-20% of the preparation.
Area of Science:
- Molecular Biology
- Developmental Biology
- Xenopus laevis Research
Background:
- Ribosomal proteins are essential components of ribosomes, the cellular machinery responsible for protein synthesis.
- Understanding the synthesis and regulation of ribosomal proteins is crucial for comprehending cell growth and development.
Purpose of the Study:
- To identify and characterize ribosomal proteins synthesized in vitro from Xenopus laevis oocyte messenger RNA (mRNA).
- To enrich and quantify the mRNA fraction encoding ribosomal proteins for potential molecular cloning applications.
Main Methods:
- Translation of poly(A)-rich RNA from Xenopus laevis oocytes in a wheat germ cell-free system.
- Analysis of synthesized proteins using two-dimensional electrophoresis.
- mRNA enrichment via oligo(dT)-cellulose chromatography and sucrose gradient sedimentation.
Main Results:
- Successfully translated Xenopus laevis oocyte mRNA produced identifiable ribosomal proteins.
- Approximately 30 distinct ribosomal proteins were synthesized in vitro.
- Enriched mRNA fractions containing ribosomal protein activity were isolated, representing an estimated 10-20% of the total preparation.
Conclusions:
- The study demonstrates the successful cell-free synthesis and identification of Xenopus laevis ribosomal proteins from oocyte mRNA.
- The enriched mRNA preparation is suitable for subsequent molecular cloning, facilitating further studies on ribosomal protein gene expression.