7ogk

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A cooperative PNPase-Hfq-RNA carrier complex facilitates bacterial riboregulation. PNPase-3'ETS(leuZ)

Structural highlights

7ogk is a 4 chain structure with sequence from Escherichia coli and Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.4Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

PNP_ECOLI Involved in mRNA degradation. Hydrolyzes single-stranded polyribonucleotides processively in the 3'- to 5'-direction.[HAMAP-Rule:MF_01595]

Publication Abstract from PubMed

Polynucleotide phosphorylase (PNPase) is an ancient exoribonuclease conserved in the course of evolution and is found in species as diverse as bacteria and humans. Paradoxically, Escherichia coli PNPase can act not only as an RNA degrading enzyme but also by an unknown mechanism as a chaperone for small regulatory RNAs (sRNAs), with pleiotropic consequences for gene regulation. We present structures of the ternary assembly formed by PNPase, the RNA chaperone Hfq, and sRNA and show that this complex boosts sRNA stability in vitro. Comparison of structures for PNPase in RNA carrier and degradation modes reveals how the RNA is rerouted away from the active site through interactions with Hfq and the KH and S1 domains. Together, these data explain how PNPase is repurposed to protect sRNAs from cellular ribonucleases such as RNase E and could aid RNA presentation to facilitate regulatory actions on target genes.

A cooperative PNPase-Hfq-RNA carrier complex facilitates bacterial riboregulation.,Dendooven T, Sinha D, Roeselova A, Cameron TA, De Lay NR, Luisi BF, Bandyra KJ Mol Cell. 2021 Jun 17. pii: S1097-2765(21)00445-7. doi:, 10.1016/j.molcel.2021.05.032. PMID:34157309[1]

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

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Citations
4 reviews cite this structure
KH domain proteins: Another family of bacterial RNA matchmakers?
Olejniczak et al. (2022)
3 more
12 other articles
No citations found

See Also

References

  1. ↑ Dendooven T, Sinha D, Roeselova A, Cameron TA, De Lay NR, Luisi BF, Bandyra KJ. A cooperative PNPase-Hfq-RNA carrier complex facilitates bacterial riboregulation. Mol Cell. 2021 Jun 17. pii: S1097-2765(21)00445-7. doi:, 10.1016/j.molcel.2021.05.032. PMID:34157309 doi:http://dx.doi.org/10.1016/j.molcel.2021.05.032

Contents


PDB ID 7ogk

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OCA

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