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    Influence of Oligomerization State on the Structural Properties of Invasion Plasmid Antigen B (IpaB) from Shigella flexneri in the Presence and Absence of Phospholipid Membranes

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    Issue Date
    2014
    Author
    Adam, Philip R.
    Dickenson, Nicholas E.
    Greenwood, Jamie C., II
    Picking, Wendy Lynn
    Picking, William D.
    Publisher
    Wiley
    Type
    Article
    Article Version
    Scholarly/refereed, author accepted manuscript
    Rights
    This is the peer reviewed version of the following article: Proteins, which has been published in final form at http://dx.doi.org/10.1002/prot.24662. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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    Abstract
    Shigella flexneri causes bacillary dysentery, an important cause of mortality among children in the developing world. Shigella secretes effector proteins via its type III secretion system (T3SS) to promote bacterial uptake into human colonic epithelial cells. The T3SS basal body spans the bacterial cell envelope anchoring a surface-exposed needle. A pentamer of invasion plasmid antigen D (IpaD) lies at the nascent needle tip and IpaB is recruited into the needle tip complex upon exposure to bile salts. From here, IpaB forms a translocon pore in the host cell membrane. Although the mechanism by which IpaB inserts into the membrane is unknown, it was recently shown that recombinant IpaB can exist as either a monomer or tetramer. Both of these forms of IpaB associate with membranes, however, only the tetramer forms pores in liposomes. To reveal differences between these membrane-binding events, Cys mutations were introduced throughout IpaB, allowing site-specific fluorescence labeling. Fluorescence quenching was used to determine the influence of oligomerization and/or membrane association on the accessibility of different IpaB regions to small solutes. The data show that the hydrophobic region of tetrameric IpaB is more accessible to solvent relative to the monomer. The hydrophobic region appears to promote membrane interaction for both forms of IpaB, however, more of the hydrophobic region is protected from solvent for the tetramer after membrane association. Limited proteolysis demonstrated that changes in IpaB’s oligomeric state may determine the manner by which it associates with phospholipid membranes and the subsequent outcome of this association.
    URI
    http://hdl.handle.net/1808/23520
    DOI
    https://doi.org/10.1002/prot.24662
    Collections
    • Molecular Biosciences Scholarly Works [581]
    Citation
    Adam, P. R., Dickenson, N. E., Greenwood, J. C., Picking, W. L., & Picking, W. D. (2014). Influence of Oligomerization State on the Structural Properties of Invasion Plasmid Antigen B (IpaB) from Shigella flexneri in the Presence and Absence of Phospholipid Membranes. Proteins, 82(11), 3013–3022. http://doi.org/10.1002/prot.24662

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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