6W8X image
Entry Detail
PDB ID:
6W8X
EMDB ID:
Keywords:
Title:
Cryo-EM of the S. solfataricus pilus
Biological Source:
PDB Version:
Deposition Date:
2020-03-21
Release Date:
2020-07-08
Method Details:
Experimental Method:
Resolution:
3.40 Å
Aggregation State:
FILAMENT
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:pilin
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, AA (auth: a), BA (auth: b), CA (auth: c), DA (auth: d), EA (auth: e), FA (auth: f), GA (auth: g)
Chain Length:132
Number of Molecules:33
Biological Source:Saccharolobus solfataricus
Ligand Molecules
Primary Citation
The structures of two archaeal type IV pili illuminate evolutionary relationships.
Nat Commun 11 3424 3424 (2020)
PMID: 32647180 DOI: 10.1038/s41467-020-17268-4

Abstact

We have determined the cryo-electron microscopic (cryo-EM) structures of two archaeal type IV pili (T4P), from Pyrobaculum arsenaticum and Saccharolobus solfataricus, at 3.8 Å and 3.4 Å resolution, respectively. This triples the number of high resolution archaeal T4P structures, and allows us to pinpoint the evolutionary divergence of bacterial T4P, archaeal T4P and archaeal flagellar filaments. We suggest that extensive glycosylation previously observed in T4P of Sulfolobus islandicus is a response to an acidic environment, as at even higher temperatures in a neutral environment much less glycosylation is present for Pyrobaculum than for Sulfolobus and Saccharolobus pili. Consequently, the Pyrobaculum filaments do not display the remarkable stability of the Sulfolobus filaments in vitro. We identify the Saccharolobus and Pyrobaculum T4P as host receptors recognized by rudivirus SSRV1 and tristromavirus PFV2, respectively. Our results illuminate the evolutionary relationships among bacterial and archaeal T4P filaments and provide insights into archaeal virus-host interactions.

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