Molecular basis of transmembrane beta-barrel formation of staphylococcal pore-forming toxins

Daichi Yamashita, Takaki Sugawara, Miyu Takeshita, Jun Kaneko, Yoshiyuki Kamio, Isao Tanaka, Yoshikazu Tanaka, Min Yao

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Pathogenic bacteria secrete pore-forming toxins (PFTs) to attack target cells. PFTs are expressed as water-soluble monomeric proteins, which oligomerize into nonlytic prepore intermediates on the target cell membrane before forming membrane-spanning pores. Despite a wealth of biochemical data, the lack of high-resolution prepore structural information has hampered understanding of the β-barrel formation process. Here, we report crystal structures of staphylococcal γ-haemolysin and leucocidin prepores. The structures reveal a disordered bottom half of the β-barrel corresponding to the transmembrane region, and a rigid upper extramembrane half. Spectroscopic analysis of fluorescently labelled mutants confirmed that the prepore is distinct from the pore within the transmembrane region. Mutational analysis also indicates a pivotal role for the glycine residue located at the lipid-solvent interface as a 'joint' between the two halves of the β-barrel. These observations suggest a two-step transmembrane β-barrel pore formation mechanism in which the upper extramembrane and bottom transmembrane regions are formed independently.

Original languageEnglish
Article number4897
JournalNature communications
Volume5
DOIs
Publication statusPublished - 2014 Sep 29

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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