View source for 6ya3


==Crystal structure of PnrA from S. pneumoniae in complex with guanosine==
<StructureSection load='6ya3' size='340' side='right'caption='[[6ya3]], [[Resolution|resolution]] 2.28&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6ya3]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6YA3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6YA3 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.28&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GMP:GUANOSINE'>GMP</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene></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=6ya3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ya3 OCA], [https://pdbe.org/6ya3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ya3 RCSB], [https://www.ebi.ac.uk/pdbsum/6ya3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ya3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0H2UPF3_STRPN A0A0H2UPF3_STRPN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Nucleotides are important for RNA and DNA synthesis and, despite a de novo synthesis by bacteria, uptake systems are crucial. Streptococcus pneumoniae, a facultative human pathogen, produces a surface-exposed nucleoside-binding protein, PnrA, as part of an ABC transporter system. Here we demonstrate the binding affinity of PnrA to nucleosides adenosine, guanosine, cytidine, thymidine and uridine by microscale thermophoresis and indicate the consumption of adenosine and guanosine by (1)H NMR spectroscopy. In a series of five crystal structures we revealed the PnrA structure and provide insights into how PnrA can bind purine and pyrimidine ribonucleosides but with preference for purine ribonucleosides. Crystal structures of PnrA:nucleoside complexes unveil a clear pattern of interactions in which both the N- and C- domains of PnrA contribute. The ribose moiety is strongly recognized through a conserved network of H-bond interactions, while plasticity in loop 27-36 is essential to bind purine- or pyrimidine-based nucleosides. Further, we deciphered the role of PnrA in pneumococcal fitness in infection experiments. Phagocytosis experiments did not show a clear difference in phagocytosis between PnrA-deficient and wild-type pneumococci. In the acute pneumonia infection model the deficiency of PnrA attenuated moderately virulence of the mutant, which is indicated by a delay in the development of severe lung infections. Importantly, we confirmed the loss of fitness in co-infections, where the wild-type out-competed the pnrA-mutant. In conclusion, we present the PnrA structure in complex with individual nucleosides and show that the consumption of adenosine and guanosine under infection conditions is required for virulence.

Crystal Structure and Pathophysiological Role of the Pneumococcal Nucleoside-binding Protein PnrA.,Abdullah MR, Batuecas MT, Jennert F, Voss F, Westhoff P, Kohler TP, Molina R, Hirschmann S, Lalk M, Hermoso JA, Hammerschmidt S J Mol Biol. 2021 Jan 22;433(2):166723. doi: 10.1016/j.jmb.2020.11.022. Epub 2020 , Nov 23. PMID:33242497<ref>PMID:33242497</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6ya3" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus pneumoniae]]
[[Category: Batuecas MT]]
[[Category: Hermoso JA]]