The plasma membrane proton pump of plant cells was originally identified by "in vivo" studies on auxin-induced growth (77, 109), active transport (99, 1 27) , and electrical potentials (140). These studies suggested that the proton pump plays a central role in plant physiology. It can be considered as a "master enzyme" that controls many important functions at the cellular and organ level, including cell division and elongation. The pioneering work of Hodges and colleagues (59) demonstrated in isolated plasma membrane vesiÂ cles the existence of a distinct ATPase activity. This represented the first step 1 040-251 9/89/0061-0061 $02.00 SERRANO towards the molecular characterization of the proton pump. The plasma membrane ATPase was later characterized at the biochemical level both in vesicles detergents ( 1 27 , 145) and in purified preparations of enzyme solubilized with ( 1 26, 1 27) . These studies demonstrated the similarities between ( 1 26) . The code number recently 3 . 6 . 1 . 35 (32). fungal and plant plasma membrane ATPases, which together constitute a novel group of ion-pumping enzymes assigned to this group by the Enzyme Nomenclature committee of the InÂ ternational Union of Biochemistry is EC genetics
Annual Review of Plant Biology – Annual Reviews
Published: Jun 1, 1989
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