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Nucleoplasmin-like domain of FKBP39 from Drosophila melanogaster forms a tetramer with partly disordered tentacle-like C-terminal segments

DOI: 10.1038/srep40405 DOI Help

Authors: Malgorzata Kozlowska (Wroclaw University of Technology) , Aneta Tarczewska (Wrocław University of Science and Technology) , Michał Jakób (Wrocław University of Science and Technology) , Dominika Bystranowska (Polish Academy of Sciences; University of Warsaw) , Michal Taube (Adam Mickiewicz University) , Maciej Kozak (Adam Mickiewicz University) , Mariusz Czarnocki-cieciura (International Institute of Molecular and Cell Biology in Warsaw; Polish Academy of Sciences; University of Warsaw) , Andrzej Dziembowski (Polish Academy of Sciences; University of Warsaw) , Marek Orłowski (Wrocław University of Science and Technology) , Katarzyna Tkocz (Beatson Institute for Cancer Research) , Andrzej Ożyhar (Wrocław University of Science and Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 7

State: Published (Approved)
Published: January 2017

Open Access Open Access

Abstract: Nucleoplasmins are a nuclear chaperone family defined by the presence of a highly conserved N-terminal core domain. X-ray crystallographic studies of isolated nucleoplasmin core domains revealed a β-propeller structure consisting of a set of five monomers that together form a stable pentamer. Recent studies on isolated N-terminal domains from Drosophila 39-kDa FK506-binding protein (FKBP39) and from other chromatin-associated proteins showed analogous, nucleoplasmin-like (NPL) pentameric structures. Here, we report that the NPL domain of the full-length FKBP39 does not form pentameric complexes. Multi-angle light scattering (MALS) and sedimentation equilibrium ultracentrifugation (SE AUC) analyses of the molecular mass of the full-length protein indicated that FKBP39 forms homotetrameric complexes. Molecular models reconstructed from small-angle X-ray scattering (SAXS) revealed that the NPL domain forms a stable, tetrameric core and that FK506-binding domains are linked to it by intrinsically disordered, flexible chains that form tentacle-like segments. Analyses of full-length FKBP39 and its isolated NPL domain suggested that the distal regions of the polypeptide chain influence and determine the quaternary conformation of the nucleoplasmin-like protein. These results provide new insights regarding the conserved structure of nucleoplasmin core domains and provide a potential explanation for the importance of the tetrameric structural organization of full-length nucleoplasmins.

Subject Areas: Biology and Bio-materials

Instruments: B21-High Throughput SAXS