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Membrane-bound 5'-nucleotidase/nucleoside phosphotransferase from Bacillus cereus
C Baiocchi1, R Pesi, M Turriani
1Dipartimento di Fisiologia e Biochimica, Università di Pisa, Italy.
The International Journal of Biochemistry
|November 1, 1993
Summary
Researchers identified a membrane-bound enzyme in Bacillus cereus with nucleoside phosphotransferase activity. This enzyme phosphorylates various nucleosides and differs from vertebrate counterparts in key characteristics.
Area of Science:
- Biochemistry
- Microbiology
Background:
- Nucleoside phosphotransferase activity is crucial for cellular metabolism.
- The characterization of such enzymes in bacteria provides insights into diverse biochemical pathways.
Purpose of the Study:
- To investigate nucleoside phosphotransferase activity in Bacillus cereus.
- To characterize the enzyme responsible for this activity and compare it with known nucleotidases.
Main Methods:
- Enzyme assays were performed to detect and characterize phosphotransferase activity.
- Substrate specificity and inhibition patterns were analyzed.
- Comparison with vertebrate 5'-nucleotidases was conducted.
Main Results:
- A membrane-bound 5'-nucleotidase in Bacillus cereus exhibited nucleoside phosphotransferase activity.
- The enzyme phosphorylated purine and pyrimidine nucleosides, including 2',3'-dideoxyinosine.
- Activity was regulated by adenylic nucleotides and inosine.
Conclusions:
- Bacillus cereus possesses a unique 5'-nucleotidase with phosphotransferase capabilities.
- Bacterial and vertebrate 5'-nucleotidases with phosphotransferase activity exhibit significant differences in location, specificity, and regulation.