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Crystal structure of Miranda/Staufen dsRBD5 complexCrystal structure of Miranda/Staufen dsRBD5 complex
Structural highlights
Function[STAU_DROME] Required both for the localization of maternal determinants to the posterior pole of the egg, oskar (osk) RNA, and for correct localization to the anterior pole, anchoring bicoid (bcd) RNA. Osk protein is required to keep osk RNA and stau protein at the posterior pole. Stau-bcd complexes form particles that show a microtubule-dependent localization.[1] [2] [3] Publication Abstract from PubMedDuring the asymmetric division of Drosophila neuroblasts (NBs), the scaffold Miranda (Mira) coordinates the subcellular distribution of cell-fate determinants including Staufen (Stau) and segregates them into the ganglion mother cells (GMCs). Here we show the fifth double-stranded RNA (dsRNA)-binding domain (dsRBD5) of Stau is necessary and sufficient for binding to a coiled-coil region of Mira cargo-binding domain (CBD). The crystal structure of Mira514-595/Stau dsRBD5 complex illustrates that Mira forms an elongated parallel coiled-coil dimer, and two dsRBD5 symmetrically bind to the Mira dimer through their exposed beta-sheet faces, revealing a previously unrecognized protein interaction mode for dsRBDs. We further demonstrate that the Mira-Stau dsRBD5 interaction is responsible for the asymmetric localization of Stau during Drosophila NB asymmetric divisions. Finally, we find the CBD-mediated dimer assembly is likely a common requirement for Mira to recognize and translocate other cargos including brain tumour (Brat). The structural basis of Miranda-mediated Staufen localization during Drosophila neuroblast asymmetric division.,Jia M, Shan Z, Yang Y, Liu C, Li J, Luo ZG, Zhang M, Cai Y, Wen W, Wang W Nat Commun. 2015 Oct 1;6:8381. doi: 10.1038/ncomms9381. PMID:26423004[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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