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==A cooperative PNPase-Hfq-RNA carrier complex facilitates bacterial riboregulation. apo-PNPase==
<StructureSection load='7ogl' size='340' side='right'caption='[[7ogl]], [[Resolution|resolution]] 3.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7OGL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7OGL FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.4&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7ogl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ogl OCA], [https://pdbe.org/7ogl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ogl RCSB], [https://www.ebi.ac.uk/pdbsum/7ogl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ogl ProSAT]</span></td></tr>
</table>
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== 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<ref>PMID:34157309</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Ribonuclease 3D structures|Ribonuclease 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Bandyra K]]
[[Category: Cameron TA]]
[[Category: De Lay N]]
[[Category: Dendooven T]]
[[Category: Luisi BF]]
[[Category: Roesoleva A]]
[[Category: Sinha D]]