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Vacuolar membranes isolated from several species including fern and moss exhibited pyro-phosphate-dependent H+ transport activity. On immunoblot analysis, H+ -pyrophosphatase was detected in the vacuolar membranes. A membrane integral protein of 23,000 daltons was not found in the membranes of Chara, Conocephalum, or Kalanchoë. Thus, H+-pyrophosphatase may be a universal enzyme among green plants, but the 23-kDa protein is not a common protein of central vacuoles.
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Maeshima et al. (1994) studied this question.
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