View source for 6szc


==NMR structure of repeat domain 13 of the fibrillar adhesin CshA from Streptococcus gordonii.==
<StructureSection load='6szc' size='340' side='right'caption='[[6szc]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6szc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_gordonii_str._Challis_substr._CH1 Streptococcus gordonii str. Challis substr. CH1]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6SZC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6SZC FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=6szc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6szc OCA], [https://pdbe.org/6szc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6szc RCSB], [https://www.ebi.ac.uk/pdbsum/6szc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6szc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A8AWJ3_STRGC A8AWJ3_STRGC] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The cell surfaces of many bacteria carry filamentous polypeptides termed adhesins that enable binding to both biotic and abiotic surfaces. Surface adherence is facilitated by the exquisite selectivity of the adhesins for their cognate ligands or receptors and is a key step in niche or host colonization and pathogenicity. Streptococcus gordonii is a primary colonizer of the human oral cavity and an opportunistic pathogen as well as a leading cause of infective endocarditis in humans. The fibrillar adhesin CshA is an important determinant of S. gordonii adherence, forming peritrichous fibrils on its surface that bind host cells and other microorganisms. CshA possesses a distinctive multidomain architecture comprising an N-terminal target-binding region fused to seventeen ~100-amino-acid-long repeat domains (RDs). Here, using structural and biophysical methods, we demonstrate that the intact CshA repeat region (CshA_RD1-17, domains 1-17) forms an extended polymeric monomer in solution. We recombinantly produced a subset of CshA RDs and found that they differ in stability and unfolding behavior. The NMR structure of CshA_RD13 revealed a hitherto unreported all beta-fold, flanked by disordered interdomain linkers. These findings, in tandem with complementary hydrodynamic studies of CshA_RD1-17, indicate that this polypeptide possesses a highly unusual dynamic transitory structure characterized by alternating regions of order and disorder. This architecture provides flexibility for the adhesive tip of the CshA fibril to maintain bacterial attachment that withstands shear forces within the human host. It may also help mitigate deleterious folding events between neighboring RDs that share significant structural identity without compromising mechanical stability.

The streptococcal multidomain fibrillar adhesin CshA has an elongated polymeric architecture.,Back CR, Higman VA, LeVay K, Patel VV, Parnell AE, Frankel D, Jenkinson HF, Burston SG, Crump MP, Nobbs AH, Race PR J Biol Chem. 2020 Mar 30. pii: RA119.011719. doi: 10.1074/jbc.RA119.011719. PMID:32229583<ref>PMID:32229583</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6szc" style="background-color:#fffaf0;"></div>

==See Also==
*[[Adhesin 3D structures|Adhesin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus gordonii str. Challis substr. CH1]]
[[Category: Back C]]
[[Category: Crump MP]]
[[Category: Higman VA]]
[[Category: Race P]]