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research
A cryptic RNA-binding domain mediates Syncrip recognition and exosomal partitioning of miRNA targets
Authors
Neil J. Ball
Cecilia Battistelli
+10 more
Alfredo Castello
Evangelos Christodoulou
Carla Cicchini
Andre Dallmann
Fruzsina Hobor
Stephen R. Martin
Roksana W. Ogrodowicz
Andres Ramos
Ian A. Taylor
Marco Tripodi
Publication date
1 January 2018
Publisher
'Springer Science and Business Media LLC'
Doi
Cite
Abstract
Exosomal miRNA transfer is a mechanism for cell-cell communication that is important in the immune response, in the functioning of the nervous system and in cancer. Syncrip/hnRNPQ is a highly conserved RNA-binding protein that mediates the exosomal partition of a set of miRNAs. Here, we report that Syncrip's amino-terminal domain, which was previously thought to mediate protein-protein interactions, is a cryptic, conserved and sequence-specific RNA-binding domain, designated NURR (N-terminal unit for RNA recognition). The NURR domain mediates the specific recognition of a short hEXO sequence defining Syncrip exosomal miRNA targets, and is coupled by a non-canonical structural element to Syncrip's RRM domains to achieve high-affinity miRNA binding. As a consequence, Syncrip-mediated selection of the target miRNAs implies both recognition of the hEXO sequence by the NURR domain and binding of the RRM domains 5′ to this sequence. This structural arrangement enables Syncrip-mediated selection of miRNAs with different seed sequences. © 2018 The Author(s)
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Archivio della ricerca- Università di Roma La Sapienza
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