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Subspecies-specific haemagglutination patterns of fimbriated Bacillus thuringiensis spores
T A Smirnova1, L I Kulinich, Galperin MYu
1Institute of Genetics, Moscow, U.S.S.R.
Abstract:
Electron microscopy revealed fimbrial appendages (pili) of three types on the surface of Bacillus thuringiensis spores. Fimbriated spores induced mannose-resistant agglutination of rat, guinea pig and/or chicken red blood cells. Each haemagglutination pattern correlated with the subspecies of a given B. thuringiensis strain, rather than with its flagellar serotype. Fimbriation and haemagglutination patterns of B. thuringiensis spores are considered to be of possible taxonomic value.
Insights
Bacillus thuringiensis spores possess three types of fimbriae (pili) that cause red blood cell agglutination. These fimbriation and agglutination patterns may help classify Bacillus thuringiensis strains.
Area of Science:
- Microbiology
- Cell Biology
- Immunology
Background:
- Bacillus thuringiensis is an important insecticidal bacterium.
- Bacterial surface structures play roles in host interactions and classification.
- The surface characteristics of B. thuringiensis spores are not fully understood.
Purpose of the Study:
- To investigate the presence and types of fimbriae on Bacillus thuringiensis spores.
- To determine if these fimbriae are responsible for red blood cell agglutination.
- To assess the potential taxonomic value of fimbriation and hemagglutination patterns in B. thuringiensis.
Main Methods:
- Electron microscopy was used to visualize bacterial surface structures.
- Hemagglutination assays were performed using various red blood cells.
- Agglutination patterns were correlated with bacterial subspecies and flagellar serotypes.
Main Results:
- Three distinct types of fimbrial appendages (pili) were identified on B. thuringiensis spores.
- Fimbriated spores induced mannose-resistant hemagglutination of rat, guinea pig, and chicken red blood cells.
- Specific hemagglutination patterns were associated with B. thuringiensis subspecies, not flagellar serotypes.
Conclusions:
- Fimbriation is a characteristic feature of Bacillus thuringiensis spores.
- The observed hemagglutination patterns are mediated by spore fimbriae.
- Spore fimbriation and hemagglutination offer potential for B. thuringiensis taxonomy and classification.