期刊
FRONTIERS IN MICROBIOLOGY
卷 11, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2020.01345
关键词
clostridium difficile; spores; exosporium layer; exosporium layer variability; electron microscope analysis
类别
资金
- Fondo Nacional de Ciencia y Tecnologia de Chile (FONDECYT) [1151025, 1191601]
- Millenium Science Initiative of the Ministry of Economy, Development and Tourism
- Fondo de Fomento al Desarrollo Cientifico y Tecnologico (FONDEF) [ID18|10230]
- Fondo Nacional de Ciencia y Tecnologia de Chile Postdoctoral Fellowship [3180692]
Clostridioides difficileis a Gram-positive anaerobic intestinal pathogenic bacterium and the causative agent of antibiotic-associated diarrhea.C. difficilespore is a dormant state which acts as a vehicle of transmission and infection. InC. difficilespores, the outermost exosporium layer is the first barrier of interaction with the host and should carry spore ligands involved in spore-host interactions.C. difficileforms two types of spores (i.e., thin and thick exosporium layers). In this communication, we contribute to understand several biological aspects of these two exosporium morphotypes. By transmission electron microscopy, we demonstrate that both exosporium morphotypes appear simultaneously during sporulation and that spore-coat laminations are formed under anaerobic conditions. Nycodenz density-gradient allows enrichment of spores with a thick-exosporium layer morphotype and presence of polar appendage. Using translational fluorescent fusions with exosporium proteins BclA3, CdeA, CdeC, and CdeM as well as with several spore coat proteins, we observed that expression intensity and distribution of SNAP-translational fusions in R20291 strain is highly heterogeneous. Electron micrographs demonstrate that multicopy expression of CdeC, but not CdeM, SNAP translational fusion, increases the abundance of the thick exosporium morphotype. Collectively, these results raise further questions on how these distinctive exosporium morphotypes are made during spore formation.
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