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    Streptococcal protein FOG, a novel matrix adhesin interacting with collagen I in vivo.

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    Authors
    Nitsche, D Patric
    Johansson, Helena M
    Frick, Inga-Maria
    Mörgelin, Matthias
    Issue Date
    2006-01-20
    
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    Abstract
    Group G streptococcus (GGS) is a human pathogen of emerging clinical significance. It causes skin and soft tissue infections, occasionally resulting in life-threatening conditions such as sepsis and necrotizing fasciitis. We recently identified FOG, a novel surface protein of GGS with fibrinogen binding and immune evasion properties. Here we investigated the role of FOG in streptococcal primary adhesion to host tissue. A FOG-expressing clinical isolate adhered more efficiently to human skin biopsies ex vivo and to the murine dermis in vivo than a FOG-deficient strain. Scanning and transmission electron microscopy of skin specimens exhibited that this property was assigned to the ability of FOG to interact with collagen I, a major interstitial component of the dermis. Overlay experiments with human skin extracts and radiolabeled FOG followed by matrix-assisted laser desorption/ionization time of flight mass spectrometry analysis identified both the alpha1- and alpha2-chains of collagen I as targets for FOG. Transmission electron microscopy of the molecular complexes revealed thread-like FOG molecules binding via their NH2 termini to distinct sites on collagen I monomers and fibrils. The results demonstrate that FOG is important for GGS adhesion in vivo, implying a pathogenic role for this surface protein.
    Citation
    J. Biol. Chem. 2006, 281(3):1670-9
    URI
    http://hdl.handle.net/10033/14732
    DOI
    10.1074/jbc.M506776200
    PubMed ID
    16278217
    Type
    Article
    Language
    en
    ISSN
    0021-9258
    ae974a485f413a2113503eed53cd6c53
    10.1074/jbc.M506776200
    Scopus Count
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    Publications of Dept. Medizinische Mikrobiologie (MMIK)

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