2-Methyl-2,4-pentanediol induces spontaneous assembly of staphylococcal α-hemolysin into heptameric pore structure

Yoshikazu Tanaka, Nagisa Hirano, Jun Kaneko, Yoshiyuki Kamio, Min Yao, Isao Tanaka

    Research output: Contribution to journalArticlepeer-review

    35 Citations (Scopus)


    Staphylococcal α-hemolysin is expressed as a water-soluble monomeric protein and assembles on membranes to form a heptameric pore structure. The heptameric pore structure of α-hemolysin can be prepared from monomer in vitro only in the presence of deoxycholate detergent micelles, artificially constructed phospholipid bilayers, or erythrocytes. Here, we succeeded in preparing crystals of the heptameric form of α-hemolysin without any detergent but with 2-methyl-2,4-pentanediol (MPD), and determined its structure. The structure of the heptameric pore was similar to that reported previously. In the structure, two molecules of MPD were bound around Trp179, around which phospholipid head groups were bound in the heptameric pore structure reported previously. Size exclusion chromatography showed that α-hemolysin did not assemble spontaneously even when stored for 1 year. SDS-PAGE analysis revealed that, among the compounds in the crystallizing buffer, MPD could induce heptamer formation. The concentration of MPD that most efficiently induced oligomerization was between 10 and 30%. Based on these observations, we propose MPD as a reagent that can facilitate heptameric pore formation of α-hemolysin without membrane binding. Published by Wiley-Blackwell.

    Original languageEnglish
    Pages (from-to)448-456
    Number of pages9
    JournalProtein Science
    Issue number2
    Publication statusPublished - 2011 Feb


    • 2-Methyl-2,4-pentanediol (MPD)
    • Crystal structure
    • Heptamer formation
    • Staphylococcal α-hemolysin

    ASJC Scopus subject areas

    • Biochemistry
    • Molecular Biology


    Dive into the research topics of '2-Methyl-2,4-pentanediol induces spontaneous assembly of staphylococcal α-hemolysin into heptameric pore structure'. Together they form a unique fingerprint.

    Cite this