期刊
PATHOGENS
卷 11, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/pathogens11050590
关键词
Filifactor alocis; label-free quantification proteomics; FtxA
类别
资金
- TUA grants from Region Vasterbotten, Sweden [7002667, 7003766]
- Insamlingsstiftelsen, Medical Faculty, Umea University, Umea, Sweden
- Strategic Funds from Karolinska Instiutet, Stockholm, Sweden
This study characterized the full proteome of ten strains of F. alocis using label-free quantification proteomics and identified differentially expressed proteins associated with FtxA-positive strains. The study also revealed specific interactions of FtxA with other intracellular proteins, highlighting its role as a major virulence factor of this species.
Filifactor alocis is a Gram-positive asaccharolytic, obligate anaerobic rod that has been isolated from a variety of oral infections including periodontitis, peri-implantitis, and odontogenic abscesses. As a newly emerging pathogen, its type strain has been investigated for pathogenic properties, yet little is known about its virulence variations among strains. We previously screened the whole genome of nine clinical oral isolates and a reference strain of F. alocis, and they expressed a novel RTX toxin, FtxA. In the present study, we aimed to use label-free quantification proteomics to characterize the full proteome of those ten F. alocis strains. A total of 872 proteins were quantified, and 97 among them were differentially expressed in FtxA-positive strains compared with the negative strains. In addition, 44 of these differentially expressed proteins formed 66 pairs of associations based on their predicted functions, which included clusters of proteins with DNA repair/mediated transformation and catalytic activity-related function, indicating different biosynthetic activities among strains. FtxA displayed specific interactions with another six intracellular proteins, forming a functional cluster that could discriminate between FtxA-producing and non-producing strains. Among them were FtxB and FtxD, predicted to be encoded by the same operon as FtxA. While revealing the broader qualitative and quantitative proteomic landscape of F. alocis, this study also sheds light on the deeper functional inter-relationships of FtxA, thus placing this RTX family member into context as a major virulence factor of this species.
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