6tnn

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Mini-RNase III (Mini-III) bound to 50S ribosome with precursor 23S rRNA

Structural highlights

6tnn is a 11 chain structure with sequence from Bacillus subtilis subsp. subtilis str. 168. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.07Å
Ligands:MG, ZN
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

RL10_BACSU Forms part of the ribosomal stalk, playing a central role in the interaction of the ribosome with GTP-bound translation factors (such as IF-2, EF-Tu, EF-G and RF3).

Publication Abstract from PubMed

The pathways for ribosomal RNA (rRNA) maturation diverge greatly among the domains of life. In the Gram-positive model bacterium, Bacillus subtilis, the final maturation steps of the two large ribosomal subunit (50S) rRNAs, 23S and 5S pre-rRNAs, are catalyzed by the double-strand specific ribonucleases (RNases) Mini-RNase III and RNase M5, respectively. Here we present a protocol that allowed us to solve the 3.0 and 3.1 A resolution cryoelectron microscopy structures of these RNases poised to cleave their pre-rRNA substrates within the B. subtilis 50S particle. These data provide the first structural insights into rRNA maturation in bacteria by revealing how these RNases recognize and process double-stranded pre-rRNA. Our structures further uncover how specific ribosomal proteins act as chaperones to correctly fold the pre-rRNA substrates and, for Mini-III, anchor the RNase to the ribosome. These r-proteins thereby serve a quality-control function in the process from accurate ribosome assembly to rRNA processing.

Structures of B. subtilis Maturation RNases Captured on 50S Ribosome with Pre-rRNAs.,Oerum S, Dendooven T, Catala M, Gilet L, Degut C, Trinquier A, Bourguet M, Barraud P, Cianferani S, Luisi BF, Condon C, Tisne C Mol Cell. 2020 Sep 23. pii: S1097-2765(20)30616-X. doi:, 10.1016/j.molcel.2020.09.008. PMID:32991829[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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Citations
3 reviews cite this structure
A comprehensive review of m6A/m6Am RNA methyltransferase structures.
Oerum et al. (2021)
2 more
3 other articles
No citations found

See Also

References

  1. ↑ Oerum S, Dendooven T, Catala M, Gilet L, Degut C, Trinquier A, Bourguet M, Barraud P, Cianferani S, Luisi BF, Condon C, Tisne C. Structures of B. subtilis Maturation RNases Captured on 50S Ribosome with Pre-rRNAs. Mol Cell. 2020 Sep 23. pii: S1097-2765(20)30616-X. doi:, 10.1016/j.molcel.2020.09.008. PMID:32991829 doi:http://dx.doi.org/10.1016/j.molcel.2020.09.008

Contents


PDB ID 6tnn

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OCA

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