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Properties of adenosine monophosphate deaminase of Candida albicans
A Thompson1, C Hall, T Karunakaran
1Department of Biology, Fisk University, Nashville, Tennessee 37208, USA.
Abstract:
Adenosine monophosphate deaminase (AMPD; EC 3.5.4.6) catalyses the hydrolysis of adenosine monophosphate (AMP) to commensurate amounts of inosine monophosphate (IMP) and ammonia. The production of AMP deaminase in Candida albicans was measured in Lee's medium grown cultures. The highest AMPD activity was observed at 24 h of growth. The enzyme had an optimum pH and temperature at 6-7 and 28 degrees C, respectively. This enzyme was inhibited under iron-limited growth conditions as well as by protease inhibitors. The AMPD of C. albicans showed a moderate increase in activity when cultures were grown in the presence of the divalent cations Mg2+, Ca2+, and Zn2+. Moreover, ADP, ATP, adenine, adenosine, deoxyribose and hypoxanthine increased the enzyme activity. Cultures grown in trypticase soy broth exhibited maximum AMPD activity compared with those grown in Sabouraud dextrose broth or Lee's medium.
Insights
This study characterized Adenosine monophosphate deaminase (AMPD) in Candida albicans, finding optimal activity at 24 hours. Enzyme function was influenced by growth conditions, cations, and specific molecules.
Area of Science:
- Biochemistry
- Enzymology
- Microbiology
Background:
- Adenosine monophosphate deaminase (AMPD) catalyzes AMP hydrolysis to IMP and ammonia.
- Understanding AMPD in Candida albicans is crucial for its metabolic studies.
Purpose of the Study:
- To characterize the AMPD enzyme from Candida albicans.
- To determine optimal growth conditions and factors affecting AMPD activity.
Main Methods:
- Enzyme activity assays in Candida albicans cultures grown in various media.
- Investigating the effects of pH, temperature, metal ions, and specific compounds on enzyme activity.
- Assessing inhibition by iron limitation and protease inhibitors.
Main Results:
- Highest AMPD activity observed at 24 hours of growth in Lee's medium.
- Optimal enzyme activity at pH 6-7 and 28°C.
- Activity was inhibited by iron limitation and protease inhibitors, but enhanced by Mg2+, Ca2+, Zn2+, ADP, ATP, adenine, adenosine, deoxyribose, and hypoxanthine.
- Trypticase soy broth yielded maximum AMPD activity compared to other media.
Conclusions:
- Candida albicans AMPD activity is significantly influenced by growth medium and specific environmental factors.
- The enzyme's regulation provides insights into purine metabolism in C. albicans.
- Further research can explore AMPD's role in fungal physiology and potential therapeutic targeting.