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-Structure paper
| Title | Archaeal bundling pili of reveal similarities between archaeal and bacterial biofilms. |
|---|---|
| Journal, issue, pages | Proc Natl Acad Sci U S A, Vol. 119, Issue 26, Page e2207037119, Year 2022 |
| Publish date | Jun 28, 2022 |
 Authors | Fengbin Wang / Virginija Cvirkaite-Krupovic / Mart Krupovic / Edward H Egelman /   |
| PubMed Abstract | While biofilms formed by bacteria have received great attention due to their importance in pathogenesis, much less research has been focused on the biofilms formed by archaea. It has been known that ...While biofilms formed by bacteria have received great attention due to their importance in pathogenesis, much less research has been focused on the biofilms formed by archaea. It has been known that extracellular filaments in archaea, such as type IV pili, hami, and cannulae, play a part in the formation of archaeal biofilms. We have used cryo-electron microscopy to determine the atomic structure of a previously uncharacterized class of archaeal surface filaments from hyperthermophilic These filaments, which we call archaeal bundling pili (ABP), assemble into highly ordered bipolar bundles. The bipolar nature of these bundles most likely arises from the association of filaments from at least two different cells. The component protein, AbpA, shows homology, both at the sequence and structural level, to the bacterial protein TasA, a major component of the extracellular matrix in bacterial biofilms, contributing to biofilm stability. We show that AbpA forms very stable filaments in a manner similar to the donor-strand exchange of bacterial TasA fibers and chaperone-usher pathway pili where a β-strand from one subunit is incorporated into a β-sheet of the next subunit. Our results reveal likely mechanistic similarities and evolutionary connection between bacterial and archaeal biofilms, and suggest that there could be many other archaeal surface filaments that are as yet uncharacterized. |
 External links | Proc Natl Acad Sci U S A / PubMed:35727984 / PubMed Central |
| Methods | EM (helical sym.) |
| Resolution | 4.0 Å |
| Structure data | EMDB-26474, PDB-7ueg: |
| Source |
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 Keywords | PROTEIN FIBRIL /  helical symmetry / biofilm / bundling pili / pili |
