NITRATE UPTAKE IN MARINE PHYTOPLANKTON: (NITRATE,CHILORIDE)-ACTIVATED ADENOSINE TRIPHOSPHATASE FROM SKELETONEMA COSTATUM (BACILLARIOPHYCEAE)1,2 |
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Authors: | Paul G Falkowski |
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Abstract: | A membrane-bound (nitrate, chloride)-activated AT Pase was found in the neritie diatom, Skeletonema costatum (Grev.) Cleve. The enzyme is suggested to translocate NO3? across the plasmalemma, against a concentration gradient. The Km of the enzyme with respect to NO3? is ca. 0.9 × 10?6 M, and is in close agreement with the reported K8 for NO3? uptake by the whole cell. |
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Keywords: | Adenosine triphosphatase Arrhenius plot ATP nitrate Skeletonema |
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