Characterization of the inorganic pyrophosphatase from the pathogenic bacterium Helicobacter pylori
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- Oliva, G., Romero, I., Ayala, G. et al. Arch Microbiol (2000) 174: 104. doi:10.1007/s002030000182
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A cytoplasmic pyrophosphatase [E.C. 188.8.131.52.] was partially purified from Helicobacter pylori. The molecular mass was estimated to be 103 kDa by gel filtration. Results of SDS-PAGE suggested that the enzyme consists of six identical subunits of 19.1 kDa each. The enzyme specifically catalyzed the hydrolysis of pyrophosphate and was very sensitive to NaF, but not to sodium molybdate. The optimal pH for activity was 8.5. Mg2+ was required for maximal activity; Mn2+, Co2+, and Zn2+ poorly supported hydrolytic activity. The pyrophosphatase had an apparent Km for Mg-PPi2– hydrolysis of 90 µM, and a Vmax estimated at 24.0 µmol Pi min–1 mg–1.