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Multiple proteinases from two Microsporum species
1Department of Microbiology and Genetics, Massey University, Palmerston North, New Zealand. MSimpanya@p5.fl.n.761.z5.fidonet.org
Abstract:
Enzyme expression of 67 isolates of two Microsporum species, M. canis and M. cookei, were compared in both shake and stationary cultures using substrate copolymerized SDS-PAGE. Most M. canis isolates expressed more proteolytic bands in shake culture, while M. cookei isolates expressed more in stationary culture. M. canis isolates expressed up to six proteinases of different relative mobilities (122, 64, 62, 45, 31 and 25 kDa). M. cookei expressed up to seven proteinases in stationary culture (67, 66, 64, 62, 45, 42 and 39 kDa). Those of 67 and 66 kDa were not expressed in shake culture. The proteinases expressed by M. cookei were similar to those expressed by M. canis except for 122 and 25 kDa. With the exception of isolates from non-infected cats, 25 kDa was also commonly expressed by isolates from infected hosts in the shake culture treatment. The differences in enzyme expression obtained may reflect differences in the contrasting ecological roles of the two species.
Insights
Enzyme expression in Microsporum canis and Microsporum cookei differs based on culture conditions. This study reveals distinct proteinase profiles, potentially reflecting their ecological roles.
Area of Science:
- Mycology
- Enzymology
- Biochemistry
Background:
- Microsporum species are dermatophytes causing superficial fungal infections.
- Understanding their enzymatic activity is crucial for diagnostics and treatment.
- Comparative analysis of enzyme expression can elucidate species-specific adaptations.
Purpose of the Study:
- To compare the enzyme expression profiles of Microsporum canis and Microsporum cookei.
- To investigate the influence of culture conditions (shake vs. stationary) on proteinase production.
- To correlate enzyme differences with the ecological roles of these two species.
Main Methods:
- Sixty-seven isolates of M. canis and M. cookei were cultured under shake and stationary conditions.
- Substrate-copolymerized SDS-PAGE was employed to analyze and compare expressed proteinases.
- Proteinase bands were identified based on relative mobilities (kDa).
Main Results:
- M. canis isolates predominantly showed more proteolytic bands in shake culture.
- M. cookei isolates exhibited greater proteinase expression in stationary culture.
- Distinct proteinase profiles were observed, with M. canis expressing 122 and 25 kDa bands, and M. cookei expressing 67, 66, 42, and 39 kDa bands not found in M. canis.
Conclusions:
- Significant differences in proteinase expression exist between M. canis and M. cookei, influenced by culture methods.
- The observed enzyme variations may be linked to the distinct ecological niches and pathogenic potentials of the two species.
- Further research into these proteinases could offer insights into dermatophyte pathogenesis and host interactions.