Journal
CURRENT OPINION IN PLANT BIOLOGY
Volume 9, Issue 6, Pages 595-600Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.pbi.2006.09.001
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pH-homeostasis in the endomembrane system requires the activity of proton-pumps. In animals, the progressive acidification of compartments along the endocytic and secretory pathways is critical for protein sorting and vesicle trafficking, and is achieved by the activity of the vacuolar H+-ATPase (V-ATPase). Plants have an additional endomembrane pump, the vacuolar H+-pyrophosphatase (V-PPase), and previous research was largely focused on the respective functions of the two pumps in secondary active transport across the tonoplast. Recent approaches, including reverse genetics, have not only provided evidence that both enzymes play unique and essential roles but have also highlighted the important functions of the two proton pumps in endocytic and secretory trafficking.
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