The basic tilted helix bundle domain of the prolyl isomerase FKBP25 is a novel double-stranded RNA binding module
Date
2017
Authors
Dilworth, David
Upadhyay, Santosh K.
Bonnafous, Pierre
Edoo, Amiirah Bibi
Bourbigot, Sarah
Pesek-Jardim, Francy
Gudavicius, Geoff
Serpa, Jason J.
Petrotchenko, Evgeniy V.
Borchers, Christoph H.
Journal Title
Journal ISSN
Volume Title
Publisher
Nucleic Acids Research
Abstract
Prolyl isomerases are defined by a catalytic domain that facilitates the cis–trans interconversion of proline residues. In most cases, additional domains in these enzymes add important biological function, including recruitment to a set of protein substrates. Here, we report that the N-terminal basic tilted helix bundle (BTHB) domain of the human prolyl isomerase FKBP25 confers specific binding to double-stranded RNA (dsRNA). This binding is selective over DNA as well as single-stranded oligonucleotides. We find that FKBP25 RNA-association is required for its nucleolar localization and for the vast majority of its protein interactions, including those with 60S pre-ribosome and early ribosome biogenesis factors. An independent mobility of the BTHB and FKBP catalytic domains supports a model by which the N-terminus of FKBP25 is anchored to regions of dsRNA, whereas the FKBP domain is free to interact with neighboring proteins. Apart from the identification of the BTHB as a new dsRNA-binding module, this domain adds to the growing list of auxiliary functions used by prolyl isomerases to define their primary cellular targets.
Description
Keywords
UVic Genome BC Proteomics Centre
Citation
Dilworth, D.; Upadhyay, S. K.; Bonnafous, P.; Edoo, A. B.; Bourbigot, S.; Pesek- Jardim, F.; … & Mackereth, C. D. (2017). The basic tilted helix bundle domain of the prolyl isomerase FKBP25 is a novel double-stranded RNA binding module. Nucleic Acids Research, 45(20), 11989-12004. DOI: 10.1093/nar/gkx852