Leonardo, Diego A. and Cavini, Italo A. and Sala, Fernanda A. and Mendonca, Deborah C. and Rosa, Higor V. D. and Kumagai, Patricia S. and Crusca Jr, Edson and Valadares, Napoleao F. and Marques, Ivo A. and Brandao-Neto, Jose and Munte, Claudia E. and Kalbitzer, Hans R. and Soler, Nicolas and Uson, Isabel and Andre, Ingemar and Araujo, Ana P. U. and Pereira, Humberto D'Muniz and Garratt, Richard C. (2021) Orientational Ambiguity in Septin Coiled Coils and its Structural Basis. JOURNAL OF MOLECULAR BIOLOGY, 433 (9): 166889. ISSN 0022-2836, 1089-8638
Full text not available from this repository. (Request a copy)Abstract
Septins are an example of subtle molecular recognition whereby different paralogues must correctly assemble into functional filaments important for essential cellular events such as cytokinesis. Most possess C-terminal domains capable of forming coiled coils which are believed to be involved in filament formation and bundling. Here, we report an integrated structural approach which aims to unravel their architectural diversity and in so doing provide direct structural information for the coiled-coil regions of five human septins. Unexpectedly, we encounter dimeric structures presenting both parallel and antiparallel arrangements which are in consonance with molecular modelling suggesting that both are energetically accessible. These sequences therefore code for two metastable states of different orientations which employ different but overlapping interfaces. The antiparallel structures present a mixed coiled-coil interface, one side of which is dominated by a continuous chain of core hydrophilic residues. This unusual type of coiled coil could be used to expand the toolkit currently available to the protein engineer for the design of previously unforeseen coiled-coil based assemblies. Within a physiological context, our data provide the first atomic details related to the assumption that the parallel orientation is likely formed between septin monomers from the same filament whilst antiparallelism may participate in the widely described inter-filament cross bridges necessary for higher order structures and thereby septin function. (C) 2021 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BURIED POLAR RESIDUES; X-RAY-STRUCTURE; FILAMENT ORGANIZATION; SINGLE-MOLECULE; PROTEIN DESIGN; PARALLEL; COMPLEX; BINDING; coiled coil; septins; protein filament; mixed hydrophobic/hydrophilic interface; crystal structures |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie > Prof. Dr. Dr. Hans Robert Kalbitzer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Sep 2022 06:52 |
| Last Modified: | 27 Sep 2022 06:52 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48006 |
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