Article (Scientific journals)
Intrinsic disorder and salt-dependent conformational changes of the N-terminal region of TFIP11 splicing factor.
Juniku, Blinera; Mignon, Julien; Carême, Rachel et al.
2024In International Journal of Biological Macromolecules, 277 (Pt 3), p. 134291
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Keywords :
Intrinsically disordered protein; Molecular dynamics; Polyampholyte; Protein assembly; Spectroscopy; Spliceosome protein; Tuftelin interacting protein 11; Intrinsic disorder; Intrinsically disordered proteins; Liquid-liquid phase separation; N-terminals; Polyampholytes; Protein-RNA interaction; Spliceosomes; Structural Biology; Biochemistry; Molecular Biology
Abstract :
Tuftelin Interacting Protein 11 (TFIP11) was identified as a critical human spliceosome assembly regulator, interacting with multiple proteins and localising in membrane-less organelles. However, a lack of structural information on TFIP11 limits the rationalisation of its biological role. TFIP11 is predicted as an intrinsically disordered protein (IDP), and more specifically concerning its N-terminal (N-TER) region. IDPs lack a defined tertiary structure, existing as a dynamic conformational ensemble, favouring protein-protein and protein-RNA interactions. IDPs are involved in liquid-liquid phase separation (LLPS), driving the formation of subnuclear compartments. Combining disorder prediction, molecular dynamics, and spectroscopy methods, this contribution shows the first evidence TFIP11 N-TER is a polyampholytic IDP, exhibiting a structural duality with the coexistence of ordered and disordered assemblies, depending on the ionic strength. Increasing the salt concentration enhances the protein conformational flexibility, presenting a more globule-like shape, and a fuzzier unstructured arrangement that could favour LLPS and protein-RNA interaction. The most charged and hydrophilic regions are the most impacted, including the G-Patch domain essential to TFIP11 function. This study gives a better understanding of the salt-dependent conformational behaviour of the N-TER TFIP11, supporting the hypothesis of the formation of different types of protein assembly, in line with its multiple biological roles.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Juniku, Blinera;  Laboratory of Physical Chemistry of Biomolecules, UCPTS, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium, Namur Institute of Structured Matter (NISM), University of Namur, Namur, Belgium, GIGA-Molecular Biology of Diseases, Molecular Analysis of Gene Expression (MAGE) Laboratory, University of Liege, B34, Avenue de l'Hôpital, B-4000 Liège, Belgium
Mignon, Julien;  Laboratory of Physical Chemistry of Biomolecules, UCPTS, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium, Namur Institute of Structured Matter (NISM), University of Namur, Namur, Belgium
Carême, Rachel;  Laboratory of Physical Chemistry of Biomolecules, UCPTS, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
Genco, Alexia  ;  Université de Liège - ULiège > GIGA
Obeid, Anna Maria  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques
Mottet, Denis  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques
Monari, Antonio;  Université Paris Cité and CNRS, ITODYS, F-75006, Paris, France
Michaux, Catherine;  Laboratory of Physical Chemistry of Biomolecules, UCPTS, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium, Namur Institute of Structured Matter (NISM), University of Namur, Namur, Belgium. Electronic address: catherine.michaux@unamur.be
Language :
English
Title :
Intrinsic disorder and salt-dependent conformational changes of the N-terminal region of TFIP11 splicing factor.
Publication date :
30 July 2024
Journal title :
International Journal of Biological Macromolecules
ISSN :
0141-8130
eISSN :
1879-0003
Publisher :
Elsevier B.V., Netherlands
Volume :
277
Issue :
Pt 3
Pages :
134291
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
B. J. and J. M. thank the Belgian National Fund for Scientific Research (F.R.S.-FNRS) for their FRIA (Fund for Research training in Industry and Agriculture) Doctoral grant and Research Fellow fellowship, respectively. A.M.O. and A.G. are PhD students supported by the University of Li\u00E8ge (Fonds Sp\u00E9ciaux Recherche) and the Belgian National Fund for Scientific Research (F.R.S.-FNRS), respectively. The authors are appreciative to the PTCI high-performance computing resource and the Research Unit in Biology of Micro-organisms of the University of Namur. The present research benefited from computational resources provided by the Consortium des \u00C9quipements de Calcul Intensif (C\u00C9CI), funded by the FNRS under grant n\u00B02.5020.11 and by the Walloon Region , and made available on Lucia, the Tier-1 supercomputer of the Walloon Region, infrastructure funded by the Walloon Region under the grant agreement n\u00B01910247 . C. M. and D. M. also thank the FNRS for their Senior Research Associate position. A. M. thanks ANR and CGI for their financial support of this work through Labex SEAM ANR 11 LABEX 086 , ANR 11 IDEX 05 02 . The support of the IdEx \u201C Universit\u00E9 Paris 2019 \u201D ANR-18-IDEX-0001 is also acknowledged. B. J. thanks Younes Bourenane Cherif for his precious help in designing the figures.
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