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Proteolytic activity in Serratia marcescens clinical isolates.
R Coria-Jiménez1, C Zárate-Aquino, O Ponce-Ponce
1Laboratory of Experimental Bacteriology, National Institute of Pediatrics, México City, 04530 México. rafaelcoria@yahoo.com
Folia Microbiologica
|July 21, 2004
Summary
Clinical isolates of Serratia marcescens (S. marcescens) produce exoproteinases linked to virulence. Proteinase activity and origin site correlated with lethal dose 50 (LD50), with a common 57.5-kDa enzyme found in all strains.
Area of Science:
- Microbiology
- Molecular Biology
- Pathogenesis
Background:
- Serratia marcescens (S. marcescens) is an opportunistic pathogen.
- Exoproteinases are virulence factors in many bacteria.
- Understanding S. marcescens exoproteinase production is crucial for assessing its pathogenic potential.
Purpose of the Study:
- To investigate exoproteinase production in clinical isolates of S. marcescens.
- To determine the relationship between exoproteinase activity, site of origin, and virulence (LD50).
- To characterize the exoproteinases produced by these isolates.
Main Methods:
- Analysis of 64 clinical isolates of S. marcescens.
- Quantification of exoproteinase activity.
- Determination of lethal dose 50 (LD50) for virulence assessment.
- Monitoring exoproteinase production over a 14-hour incubation period.
Main Results:
- Exoproteinase production was confirmed in all 64 clinical isolates.
- A significant correlation was observed between the site of origin, proteinase activity, and LD50.
- Exoproteinase production varied during incubation, with a 57.5-kDa proteinase consistently detected in all strains.
- Exoproteinase production was directly related to S. marcescens strain virulence.
Conclusions:
- Exoproteinase production is a common characteristic of clinical S. marcescens isolates.
- The level of exoproteinase activity and specific enzyme profiles are associated with bacterial virulence.
- These findings highlight the role of exoproteinases in S. marcescens pathogenesis.