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A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates
Published on: August 21, 2018
Antagonism between GLD-2 binding partners controls gamete sex
Kyung Won Kim1, Keith Nykamp, Nayoung Suh
1Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA.
Developmental Cell
|May 23, 2009
Summary
Two distinct poly(A) polymerases (PAPs) in C. elegans, formed by GLD-2 with either GLD-3 or RNP-8, control the transition from spermatogenesis to oogenesis, specifying gamete identity.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Cytoplasmic polyadenylation is a crucial gene regulation mechanism.
- In C. elegans, GLD-2 (catalytic) and GLD-3 (RNA-binding) form a major cytoplasmic poly(A) polymerase (PAP).
Purpose of the Study:
- To identify novel partners of GLD-2.
- To elucidate the distinct roles of GLD-2 complexes in gamete development and the spermatogenesis-oogenesis transition.
Main Methods:
- Protein-protein interaction studies to identify GLD-2 partners.
- Biochemical assays to assess GLD-2 activity stimulation.
- Genetic analyses (cosuppression, competition assays) to study partner antagonism and in vivo function.
Main Results:
- RNP-8 was identified as a second GLD-2 binding partner, forming a functional PAP.
- GLD-2 forms two distinct PAP complexes: GLD-2/GLD-3 and GLD-2/RNP-8.
- These complexes exhibit distinct RNA-binding specificities and form selectively during development.
- GLD-2/GLD-3 promotes spermatogenesis, while GLD-2/RNP-8 specifies oogenesis.
- RNP-8 and GLD-3 antagonize each other for GLD-2 binding.
Conclusions:
- GLD-2 functions as a central component of two distinct PAPs.
- The combinatorial association of GLD-2 with its partners (GLD-3 or RNP-8) directs gamete identity and regulates the developmental transition.
- This provides a mechanism for precise control over germline development in C. elegans.
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