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Studying the Structural Organization of Polyribosomes with Alexander S. Spirin

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Abstract

“Would it be possible to analyze molecular mechanisms and structural organisation of polyribosome assemblies using cryo electron tomography?” – we asked through a longstanding collaboration between my research group and that of Alexander S. Spirin. Indeed, it was: we found that double-row polyribosomes can have both circular and linear arrangements of their mRNA [Afonina, Z. A., et al. (2013) Biochemistry (Moscow)], we figured out how eukaryotic ribosomes assemble on an mRNA to form supramolecular left-handed helices [Myasnikov, A. G., et al. (2014) Nat. Commun.], that the circularization of polyribosomes is poly-A and cap-independent [Afonina, Z. A., et al. (2014) Nucleic Acids Res.], and that intermediary polyribosomes with open structures exist after a transition from a juvenile phase to strongly translating polysomes of medium size [Afonina, Z. A., et al. (2015) Nucleic Acids Res.] until they form densely packed helical structures with reduced activity. Our joint fruitful exchanges, hence, led to major advances in the field, which are reviewed here from a personal and historical perspective in memory of Alexander S. Spirin.

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Abbreviations

cryo-EM:

cryo electron microcopy

cryo-ET:

cryo electron tomography

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Funding

I thank past and present members of my research group at CBI/IGBMC for dedicated research and members of the integrated structural biology platform at the CBI/IGBMC for support. I acknowledge support by Centre National pour la Recherche Scientifique (CNRS), Institut National pour la Recherche Médicale (Inserm), Association pour la Recherche sur le Cancer (ARC), Institut National du Cancer (INCa), the Fondation pour la Recherche Médicale (FRM), Ligue nationale contre le cancer (Ligue), Agence National pour la Recherche (ANR), and USIAS of the University of Strasbourg (USIAS-2018-012). The electron microscope facility was supported by the Région Grand Est and by the French Infrastructure for Integrated Structural Biology (FRISBI) and Instruct-ERIC.

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Correspondence to Bruno P. Klaholz.

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The author declares no conflicts of interest in financial or any other sphere. This article does not contain any studies involving human participants or animals performed by the author.

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Klaholz, B.P. Studying the Structural Organization of Polyribosomes with Alexander S. Spirin. Biochemistry Moscow 86, 1053–1059 (2021). https://doi.org/10.1134/S0006297921090030

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