Samuel Holvec, Charles Barchet, Antony Lechner, Léo Fréchin, S. Nimali T. De Silva, Isabelle Hazemann, Philippe Wolff, Ottilie von Loeffelholz, Bruno P. Klaholz
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引用次数: 0
Abstract
The ribosomal RNA of the human protein synthesis machinery comprises numerous chemical modifications that are introduced during ribosome biogenesis. Here we present the 1.9 Å resolution cryo electron microscopy structure of the 80S human ribosome resolving numerous new ribosomal RNA modifications and functionally important ions such as Zn2+, K+ and Mg2+, including their associated individual water molecules. The 2′-O-methylation, pseudo-uridine and base modifications were confirmed by mass spectrometry, resulting in a complete investigation of the >230 sites, many of which could not be addressed previously. They choreograph key interactions within the RNA and at the interface with proteins, including at the ribosomal subunit interfaces of the fully assembled 80S ribosome. Uridine isomerization turns out to be a key mechanism for U–A base pair stabilization in RNA in general. The structural environment of chemical modifications and ions is primordial for the RNA architecture of the mature human ribosome, hence providing a structural framework to address their role in healthy states and in human diseases. The cryo-EM structure of the full 80S human ribosome is presented at 1.9 Å resolution. Numerous new chemical modifications are resolved, resulting in over 230 annotated sites cross-validated by mass spectometry. Ions and water molecules are seen to stabilize the RNA architecture.
期刊介绍:
Nature Structural & Molecular Biology is a comprehensive platform that combines structural and molecular research. Our journal focuses on exploring the functional and mechanistic aspects of biological processes, emphasizing how molecular components collaborate to achieve a particular function. While structural data can shed light on these insights, our publication does not require them as a prerequisite.