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TitleThe structures of two archaeal type IV pili illuminate evolutionary relationships.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 3424, Year 2020
Publish dateJul 9, 2020
AuthorsFengbin Wang / Diana P Baquero / Zhangli Su / Leticia C Beltran / David Prangishvili / Mart Krupovic / Edward H Egelman /
PubMed AbstractWe 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 ...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.
External linksNat Commun / PubMed:32647180 / PubMed Central
MethodsEM (helical sym.)
Resolution3.4 - 3.8 Å
Structure data

21578

6w8u

EMDB-21578, PDB-6w8u:
Cryo-EM of the Pyrobaculum arsenaticum pilus
Method: EM (helical sym.) / Resolution: 3.8 Å

21579

6w8x

EMDB-21579, PDB-6w8x:
Cryo-EM of the S. solfataricus pilus
Method: EM (helical sym.) / Resolution: 3.4 Å

Source
  • pyrobaculum arsenaticum (archaea)
  • saccharolobus solfataricus (archaea)
KeywordsPROTEIN FIBRIL / helical symmetry / archaeal pilus / Type IV pilus

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