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Updated: Aug 4, 2026
11:34
Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
Published on: August 9, 2019
A sequence-specific RNA binding complex expressed in murine germ cells contains MSY2 and MSY4
H G Davies1, F Giorgini, M A Fajardo
1Department of Genetics, University of Washington, Seattle, Washington 98195, USA.
Developmental Biology
|April 25, 2000
Summary
Mice store protamine mRNAs in repressed particles. A novel protein, Msy4, binds to these mRNAs, suggesting a role in regulating gene expression during sperm development.
Area of Science:
- Molecular Biology
- Reproductive Biology
- Gene Regulation
Background:
- Protamine mRNAs are translationally repressed during murine spermatogenesis, stored in ribonucleoprotein particles for up to 8 days.
- Translational repression of protamine 1 (Prm1) mRNA is regulated by sequences in its 3'-untranslated region (UTR).
Purpose of the Study:
- To identify proteins involved in the translational repression and storage of protamine mRNAs.
- To characterize the function of novel Y-box binding proteins in germ cell development.
Main Methods:
- Yeast three-hybrid system for cloning nucleic acid-binding proteins.
- Electrophoretic mobility shift assays (EMSA) and immunoprecipitation to analyze protein-RNA interactions.
- Polysome analysis to assess mRNA translation status.
Main Results:
- Cloned Msy4, a novel Y-box family nucleic acid-binding protein, using the yeast three-hybrid system.
- Demonstrated that Msy4 specifically binds to the 5' region of the Prm1 3' UTR.
- MSY4 is highly expressed in the testis and detected in germ cell cytoplasm of both testis and ovary.
- Identified MSY4 as a component of a 48/50-kDa binding activity in testis extracts, along with MSY2.
- MSY4 is associated with messenger ribonucleoprotein particles (mRNPs), indicating a role in storing repressed messages.
Conclusions:
- Msy4 is a key protein involved in the translational repression and storage of protamine mRNAs during spermatogenesis.
- Msy4, along with MSY2, forms a complex that binds to Prm1 mRNA, contributing to translational control in germ cells.
- The findings provide new insights into the molecular mechanisms regulating gene expression in male germ cells.
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