Autoaggregating Yersinia enterocolitica express surface fimbriae with high surface hydrophobicity

Area of Science:

• Microbiology
• Bacterial Pathogenesis
• Molecular Biology

Background:

• Yersinia enterocolitica is a significant human pathogen.
• Bacterial adhesion factors like haemagglutinins and fimbriae are critical for colonization.
• Environmental factors, such as temperature, can influence bacterial virulence traits.

Purpose of the Study:

• To investigate the correlation between mannose-resistant Yersinia haemagglutinin (MR/Y HA) production, fimbriae presence, and surface hydrophobicity in Yersinia enterocolitica.
• To determine the effect of growth temperature on these bacterial characteristics.

Main Methods:

• Culturing of 13 Yersinia enterocolitica strains at low ( < 32°C) and high ( > 35°C) temperatures.
• Assessing MR/Y HA production.
• Observing fimbriae presence using electron microscopy.
• Measuring bacterial surface hydrophobicity.

Main Results:

• A strong positive correlation was observed between MR/Y HA production, fimbriae presence, and high surface hydrophobicity in Yersinia enterocolitica.
• These virulence-associated characteristics were expressed in cultures grown at low temperatures.
• The expression of MR/Y HA, fimbriae, and high surface hydrophobicity was significantly reduced or absent in cultures grown at high temperatures.

Conclusions:

• Temperature is a critical regulatory factor for the expression of key virulence factors in Yersinia enterocolitica.
• The findings suggest that MR/Y HA, fimbriae, and hydrophobicity are co-regulated and play a role in Yersinia enterocolitica pathogenesis, particularly under specific environmental conditions.