Identification of a novel protein promoting the colonization and survival of Finegoldia magna, a bacterial commensal and opportunistic pathogen.

Inga-Maria Frick, Christofer Karlsson, Matthias Mörgelin, Anders I Olin, Radmila Janjusevic, Clara Hammarström, Elisabet Holst, Maarten de Château, Lars Björck

Research output: Contribution to journalArticlepeer-review

Abstract

Anaerobic bacteria dominate the human normal microbiota but strikingly little is known about these commensals. Finegoldia magna is a Gram-positive anaerobe found in the skin and at other non-sterile body surfaces, but it is also an opportunistic pathogen. This study describes a novel protein designated FAF (F. magnaAdhesion Factor) and expressed by more than ninety percent of F. magna isolates. The protein is present in substantial quantities at the F.magna surface but is also released from the surface. FAF forms large protein aggregates in solution and surface-associated FAF causes bacterial clumping. In skin F. magna bacteria were localized to the epidermis, where they adhere to basement membranes. FAF was found to mediate this adhesion via interactions with BM-40, a basement membrane protein. The biological significance of FAF is further underlined by the observation that it blocks the activity of LL-37, a major human antibacterial peptide. Altogether, the data demonstrate that FAF plays an important role in colonization and survival of F. magna in the human host.
Original languageEnglish
Pages (from-to)695-708
JournalMolecular Microbiology
Volume70
DOIs
Publication statusPublished - 2008

Subject classification (UKÄ)

  • Microbiology in the medical area

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