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Vacuolar proton pumping pyrophosphatase (H+-PPase; EC 3.6.1.1) plays a pivotal role in electrogenic translocation of protons from cytosol to the vacuolar lumen at the expense of PPi hydrolysis. A histidine-specific modifier, diethylpyrocarbonate (DEPC), could substantially inhibit enzymic activity and H+-translocation of vacuolar H+-PPase in a concentration-dependent manner. Absorbance of vacuolar...
Treatment of the tonoplast H + -ATPase from mung bean seedlings (Vigna radiata L.) with histidine-specific modifier, diethyl pyrocarbonate (DEP), caused a marked loss of the ATP hydrolysis activity and the proton translocation in a concentration-dependent manner. The reaction order of inhibition was calculated to be 0.98, suggesting that at least one histidine residue of vacuolar H + ...
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