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Molecular insight into the Drosophila piRNA pathway network through a combination of systematic protein interaction screening and structural prediction
Open accessPreprint — published as 10.1093/nar/gkaf993
Abstract
SUMMARY: piRNA-bound PIWI proteins mediate the silencing of transposons at both the transcriptional and post-transcriptional levels, processes that are critical for genome integrity and fertility in animals. While numerous additional proteins are known to be essential for piRNA biogenesis and function in Drosophila and other animals, their molecular and mechanistic functions have remained largely unknown. To improve our molecular understanding of the Drosophila piRNA pathway, we used a cell culture-based protein-protein interaction assay called ReLo to perform a systematic pairwise interaction screen involving 22 factors operating in the cytoplasm, including PIWI proteins, Tudor domain-containing proteins (TDRDs), RNA helicases, and mitochondrial surface proteins. Through additional ReLo interaction testing and structural modeling using AlphaFold-Multimer, we have characterized six protein complexes at the molecular and structural levels. We believe that the results of this screen and our methodological approach are likely to guide future research into the molecular mechanisms underlying piRNA biogenesis and function.
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![Figure 1. ReLo assay-based PPI screen of cytoplasmic and mitochondrial surface piRNA pathway factors. (A) Principle of the ReLo assay. Two constructs, as indicated, were coexpressed in S2R+ cells, and an interaction between them was inferred if unanchored protein 2 relocalized to the site of membrane-anchored protein 1. Adapted from Fig. 1 of Salgania et al. [53]. (B) Summary of the PPI screen. Colored rectangles indicate PPIs identified by ReLo assays and categorized as previously characterized by crystal structures (green), previously observed in co-IPs (blue), or previously unreported (orange). Homodimer formation was not tested (gray). Boxes marked with an asterisk (*) indicate previously reported interactions based on co-IP, Y2H, CL-IP, but not crystal structures (see Supplementary Table S1) that could not be detected using the ReLo assay. Although redundant, a square layout was chosen over a triangular one to facilitate quick access to interaction partners of any given protein. (C) The interaction between Krimper and Aubergine was sDMA-dependent in ReLo assays. The interactions between Krimper and Ago3 (D) and between Papi and Piwi (E) were sDMA-independent. LLY-283 and DMSO concentrations were 0.5 μM and 0.005%, respectively, in panels (C) and (E) and 1 μM and 0.01%, respectively, in panel (D). The 4RK mutations in Aub and Ago3 were R11K/R13K/R15K/R17K and R4K/R68K/R70K/R72K, respectively. Scale bars are 10 μm. Arginine methylation of Aubergine in DMSO control samples and its absence in LLY-283-treated samples was verified by mass spectrometry (Supplementary Fig. S4).](/paper-figures/285b24afae8d4b1b9d8f7a2a7d168133/molecular-insight-into-the-i-drosophila-i-pirna-pathway-network-through-a-figure-1.jpg)






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Highly accurate protein structure prediction with AlphaFold
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Metadata
- Authors
- Salgania, H. K., Metz, J., Lingren, E., Bleischwitz, C., Hauser, D., Oliveras Máté, K., Bollack, D., Lahr, F., Garbelyanski, A., & Jeske, M.
- Affiliations
- Heidelberg University (DE)
- Corresponding author
- Jeske, Mandy
- ORCID
- Venue
- Nucleic Acids Research
- Publisher
- openRxiv
- Published
- 2024-06-01
- Volume
- 53
- Issue
- 19
- ISSN
- 0305-1048 (ISSN-L)
- PMC
- PMC12526068
- OpenAlex
- W4415197847
- Cited by
- 5
- References
- 1
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 1
- FWCI
- 2.16
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Nucleic Acids Research (publishedVersion, cc-by-nc)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- California Department of Fish and Game (INST 35/1503-1 FUGG, INST 35/1314-1 FUGG)
- Deutsche Forschungsgemeinschaft (INST 35/1314-1 FUGG., INST35/1503‐1FUGG, JE827/1-1, JE-827/1-2)
- Universität Heidelberg
- Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Chromosomal and Genetic Variations
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Keywords
- piRNA pathway, PIWI proteins, piRNA biogenesis, transposon silencing, protein-protein interaction, protein complex structure, RNA helicase, Drosophila
- MeSH terms
- Piwi-Interacting RNA, Animals, Drosophila melanogaster, Models, Molecular, Protein Binding, RNA Helicases, Protein Interaction Mapping, Drosophila Proteins, RNA, Small Interfering, Argonaute Proteins
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