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Structural basis for the antagonistic roles of RNP-8 and GLD-3 in GLD-2 poly(A)-polymerase activity

MPG-Autoren
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Nakel,  Katharina
Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society;

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Bonneau,  Fabien
Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society;

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Basquin,  Claire
Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society;

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Habermann,  Bianca
Habermann, Bianca / Computational Biology, Max Planck Institute of Biochemistry, Max Planck Society;

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Conti,  Elena
Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society;

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RNA-2016-Nakel-1139-45.pdf
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Supplemental_Material.docx
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Zitation

Nakel, K., Bonneau, F., Basquin, C., Habermann, B., Eckmann, C. R., & Conti, E. (2016). Structural basis for the antagonistic roles of RNP-8 and GLD-3 in GLD-2 poly(A)-polymerase activity. RNA, 22(8), 1139-1145. doi:10.1261/rna.056598.116.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002C-1AC5-C
Zusammenfassung
Cytoplasmic polyadenylation drives the translational activation of specific mRNAs in early metazoan development and is performed by distinct complexes that share the same catalytic poly(A)-polymerase subunit, GLD-2. The activity and specificity of GLD-2 depend on its binding partners. In Caenorhabditis elegans, GLD-2 promotes spermatogenesis when bound to GLD-3 and oogenesis when bound to RNP-8. GLD-3 and RNP-8 antagonize each other and compete for GLD-2 binding. Following up on our previous mechanistic studies of GLD-2-GLD-3, we report here the 2.5 resolution structure and biochemical characterization of a GLD-2-RNP-8core complex. In the structure, RNP-8 embraces the poly(A)-polymerase, docking onto several conserved hydrophobic hotspots present on the GLD-2 surface. RNP-8 stabilizes GLD-2 and indirectly stimulates polyadenylation. RNP-8 has a different amino-acid sequence and structure as compared to GLD-3. Yet, it binds the same surfaces of GLD-2 by forming alternative interactions, rationalizing the remarkable versatility of GLD-2 complexes.