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Studies on Na+-K+-activated adenosine triphosphatase. XVI. Its absence from the cation transport system of Ulva lactuca

, : Studies on Na+-K+-activated adenosine triphosphatase. XVI. Its absence from the cation transport system of Ulva lactuca. Bibliotek for Laeger 112(3): 519-523

1.1. The ouabain-sensitive Na+K+-activated adenosine triphosphatase, which is closely related to, or identical with the active Na+K+ transport system, occurs with a great variety of animal species and tissues.2.2. The cation transport system of the marine green alga Ulva lactuca, the common “sea lettuce”, has a K+ influx 3.5 times as large as the Na+ efflux in darkness and upon illumination the K+ influx increases sharply without change in Na+ efflux.3.3. Enzyme assay showed that Ulva lactuca lacks an ouabain-sensitive Na+K+-activated adenosine triphosphatase system.4.4. The absence of an ouabain-sensitive cation transport system was concluded from the lack of effect of incubation in 104 M ouabain upon the Na+ and K+ levels of the tissue and upon the 86Rb+ uptake rate.5.5. Although the exact limits to the occurrence of Na+K+-activated adenosine triphosphatase and ouabain-sensitive cation transport are not yet known, the correlation between these two is so far unbroken.


PMID: 4223673

DOI: 10.1016/0926-6585(66)90254-8

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