BIROn - Birkbeck Institutional Research Online

    Structural determinants of polymerization reactivity of the P pilus Adaptor Subunit PapF

    Verger, Denis and Rose, R.J. and Paci, E. and Costakes, G. and Daviter, Tina and Hultgren, S.J. and Remaut, Han and Ashcroft, A.E. and Radford, S.E. and Waksman, Gabriel (2008) Structural determinants of polymerization reactivity of the P pilus Adaptor Subunit PapF. Structure 16 (11), pp. 1724-1731. ISSN 0969-2126.

    Full text not available from this repository.


    P pili are important adhesive fibers involved in kidney infection by uropathogenic Escherichia coli. Pilus subunits are characterized by a large groove resulting from lack of a β strand. Polymerization of pilus subunits occurs via the donor-strand exchange (DSE) mechanism initiated when the N terminus of an incoming subunit interacts with the P5 region/pocket of the previously assembled subunit groove. Here, we solve the structure of the PapD:PapF complex in order to understand why PapF undergoes slow DSE. The structure reveals that the PapF P5 pocket is partially obstructed. MD simulations show this region of PapF is flexible compared with its equivalent in PapH, a subunit that also has an obstructed P5 pocket and is unable to undergo DSE. Using electrospray-ionization mass spectrometry, we show that mutations in the P5 region result in increased DSE rates. Thus, partial obstruction of the P5 pocket serves as a modulating mechanism of DSE.


    Item Type: Article
    Keyword(s) / Subject(s): Proteins, microbio
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Research Centres and Institutes: Structural Molecular Biology, Institute of (ISMB)
    Depositing User: Administrator
    Date Deposited: 04 Aug 2010 14:09
    Last Modified: 02 Aug 2023 16:49


    Activity Overview
    6 month trend
    6 month trend

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item