View source for 9h38


==C-terminal domain of the F-ENA tip fibrillum F-BclA from Bacillus thuringiensis==
<StructureSection load='9h38' size='340' side='right'caption='[[9h38]], [[Resolution|resolution]] 2.29&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9h38]] is a 21 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_thuringiensis Bacillus thuringiensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9H38 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9H38 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]] 2.29&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</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=9h38 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9h38 OCA], [https://pdbe.org/9h38 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9h38 RCSB], [https://www.ebi.ac.uk/pdbsum/9h38 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9h38 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A9X6QBI1_BACTU A0A9X6QBI1_BACTU] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
For over 100 years, Bacillus thuringiensis (Bt) has been used as an agricultural biopesticide to control pests caused by insect species in the orders of Lepidoptera, Diptera and Coleoptera. Under nutrient starvation, Bt cells differentiate into spores and associated toxin crystals that can adopt biofilm-like aggregates. We reveal that such Bt spore/toxin biofilms are embedded in a fibrous extrasporal matrix (ESM), and using cryoID, we resolved the structure and molecular identity of an uncharacterized type of pili, referred to here as Fibrillar ENdospore Appendages or 'F-ENA'. F-ENA are monomolecular protein polymers tethered to the exosporium of Bt and are decorated with a flexible tip fibrillum. Phylogenetic analysis reveals that F-ENA is widespread not only in the class Bacilli, but also in the class Clostridia, and the cryoEM structures of F-ENA filaments from Bacillus, Anaerovorax and Paenibaccilus reveal subunits with a generic head-neck domain structure, where the beta-barrel neck of variable length latch onto a preceding head domain through short N-terminal hook peptides. In Bacillus, two collagen-like proteins (CLP) respectively tether F-ENA to the exosporium (F-Anchor), or constitute the tip fibrillum at the distal terminus of F-ENA (F-BclA). Sedimentation assays point towards F-ENA involvement in spore-spore clustering, likely mediated via F-BclA contacts and F-ENA bundling through the antiparallel interlocking of the head-neck units.

Cryo-EM analysis of the Bacillus thuringiensis extrasporal matrix identifies F-ENA as a widespread family of endospore appendages across the Firmicutes phylum.,Sleutel M, Sogues A, Van Gerven N, Jonsmoen UL, Van Molle I, Fislage M, Theunissen LD, Bellis NF, Baquero DP, Egelman EH, Krupovic M, Wang F, Aspholm M, Remaut H bioRxiv [Preprint]. 2025 Feb 11:2025.02.11.637640. doi: , 10.1101/2025.02.11.637640. PMID:39990323<ref>PMID:39990323</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9h38" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Bacillus thuringiensis]]
[[Category: Large Structures]]
[[Category: Remaut H]]
[[Category: Sleutel M]]
[[Category: Sogues A]]