Characterization of enterobacteria by esterase specific-activity profiles

Area of Science:

• Microbiology
• Biochemistry
• Genetics

Background:

• Enterobacteriaceae represents a diverse group of Gram-negative bacteria.
• Accurate identification of Enterobacteriaceae species is crucial for clinical and epidemiological purposes.
• Enzyme polymorphism, specifically esterases, offers a potential marker for bacterial differentiation.

Purpose of the Study:

• To analyze the esterase enzyme profiles and electrophoretic mobilities of a large collection of Enterobacteriaceae strains.
• To evaluate the utility of esterase specific-activity profiles (ESAP) and electrophoretic data for species identification within the Enterobacteriaceae family.
• To identify the minimal set of esterase characters for accurate Yersinia species identification.

Main Methods:

• Acrylamide/agarose gel electrophoresis was employed to analyze esterase activities and mobilities.
• Standardized methods were used for staining and comparing electrophoretic mobilities.
• Multiple correspondence analysis (MCA) and binary segmentation tree techniques were applied to the esterase data.

Main Results:

• Nineteen distinct esterase types were identified based on their specific-activity profiles (ESAP).
• Multiple correspondence analysis (MCA) correctly classified 82% of the 36 Enterobacteriaceae species based on ESAP data.
• Esterase profiles and electrophoretic mobilities clearly delineated species within their respective groups, with Yersinia species identification optimized using a binary segmentation tree.

Conclusions:

• Esterase polymorphism, analyzed by gel electrophoresis and MCA, is a reliable method for differentiating and identifying species within the Enterobacteriaceae family.
• The study provides a robust electrophoretic key for Enterobacteriaceae classification.
• Specific esterase markers were identified for efficient Yersinia species identification.