View source for 7vcn


==Crystal Structure of PitA fragment from pilus islet-2 of Streptococcus oralis with Tb-Xo4==
<StructureSection load='7vcn' size='340' side='right'caption='[[7vcn]], [[Resolution|resolution]] 2.34&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7vcn]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_oralis_ATCC_35037 Streptococcus oralis ATCC 35037]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7VCN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7VCN 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]] 2.343&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=7MT:Tb-Xo4'>7MT</scene>, <scene name='pdbligand=TB:TERBIUM(III)+ION'>TB</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=7vcn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7vcn OCA], [https://pdbe.org/7vcn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7vcn RCSB], [https://www.ebi.ac.uk/pdbsum/7vcn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7vcn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/D4FSQ3_STROR D4FSQ3_STROR] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Streptococcus oralis is a member of the mitis group of oral streptococci and an early colonizer in dental plaque biofilm, a major cause of periodontal disease, dental caries, and other oral infections. S. oralis promotes biofilm growth by coaggregating in a mutualistic partnership with other early colonizers such as Actinomyces oris. For this cell-to-cell interaction, A. oris is known to use its sortase-dependent pilus (type 2), but whether S. oralis uses its PI-2 (pilus islet 2) pilus is still to be determined. The PI-2 pilus is predicted to have a heterodimeric structure consisting of two different protein subunits with their own location and function: the tip PitA pilin for adhesion and the backbone PitB pilin for length. Thus far, structural information remains incomplete about the role of PI-2 pili in the mutualistic mechanism between S. oralis and A. oris. We now report on the crystal structure analysis of PitA and PitB using X-ray crystallography, small-angle X-ray scattering, and molecular docking studies. Accordingly, we propose a structural model for the PI-2 pilus, wherein repeating PitB subunits are arranged head-to-tail to form the long backbone structure with PitA on the outer tip. By performing both in vitro and in vivo experiments, we examined the role played by PitA in mediating the mutualistic interaction between S. oralis and A. oris, which appears to involve the coaggregation factor CafA. We also reveal that the galactose monosaccharide is a conceivable ligand for PitA and thereby might be used to inhibit coaggregation and control oral biofilm development. DATABASE: Structural coordinates for the PitA fragment, PitA fragment TbXO4 derivative, full-length PitA, and PitB from S. oralis have been deposited at the Protein Data Bank as 7VCR, 7W7I, 7VCN, 7W6B, and 7W7I, respectively. Streptococcus pneumoniae PitB coordinates have been deposited as 7F7Y.

New structural insights into the PI-2 pilus from Streptococcus oralis, an early dental plaque colonizer.,Yadav RK, Krishnan V FEBS J. 2022 Oct;289(20):6342-6366. doi: 10.1111/febs.16527. Epub 2022 May 28. PMID:35561142<ref>PMID:35561142</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7vcn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus oralis ATCC 35037]]
[[Category: Krishnan V]]
[[Category: Yadav RK]]