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Beta-galactosyl-pyrrolidinyl diazeniumdiolates (beta-Gal-NONOate) is a new site-specific nitric oxide (NO)-releasing compound, which releases NO once activated by beta-galactosidase. In the present experiment, we used beta-Gal-NONOate as a bactericidal reagent to investigate its effectiveness of NO releasing. Through the evaluation of intracellular NO level and the comparison of survival of E. coli transformed with lacZ gene but treated with beta-Gal-NONOate and NONOate, respectively, it's evident that beta-Gal-NONOate had a higher bactericidal activity than conventional NONOate. While either beta-Gal-NONOate- or NONOate-treated E. coli without transferred lacZ gene showed low bactericidal activity. The results revealed that beta-Gal-NONOate was a potentially efficient NO donor, which took on a novel and promising approach to deliver NO into cells.

Delivery of Nitric Oxide Released from .BETA.-Gal-NONOate Activation by .BETA.-Galactosidase and Its Activity against Escherichia coli