Abstract
The electrogenic Cl−-pump in the plasmalemma of the marine algaAcetabularia acetabulum (L.) Silva has been suggested to be an unusual type of ATPase (Gradmann, 1989, Methods Enzymol.174, 490). For a biochemical treatment of this issue, a plasmalemma-rich membrane fraction fromAcetabularia has been prepared by phase-partitioning. About 80% of the ATPase activity in this material is inhibited by vanadate (K I50=1–2 μM). The phosphohydrolytic properties of the corresponding enzyme were further investigated. Its primary substrate MgATP2− (K m about 270 μM). Compared with other plasmalemma ATPases, it has an extremely alkaline pH optimum (pH 8–8.5), a weak sensitivity to diethyl-stilbestrol and to N,N'-dicyclohexylcarbodiimide, a strong selectivity for Mg2+ over alternative divalent cations, and a weak selectivity for ATP over other phosphohydrolytic substrates. It is insensitive to KCl at concentrations up to 200 mM. Both ATP4− and Mg2ATP inhibit the ATPase, satisfying a relationship for competitive inhibition by 2ATP4− (K IATP=1.56 mM) and noncompetitive inhibition by Mg2ATP (K IMg2ATP=1.35 mM). Since no transport experiments are reported in this study, the ion species (H+ or Cl−) that is transferred by this ATPase is not identified.
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Abbreviations
- Bis-tris-propane:
-
1,3-bis[tris(hydroxymethyl)methylaminopropane
- DCCD:
-
N,N'-dicyclohexylcarbodiimide
- DES:
-
diethylstilbestrol
- DOC:
-
sodium deoxycholate
- Mes:
-
2-(N-morpholino)ethanesulfonic acid
- PCMBS:
-
p-chloromercuri-benzenesulfonate
- PM:
-
plasmalemma-enriched membrane fraction
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This work was supported by the Deutsche Forschungsgemeinschaft. We thank Mrs. Hanna Bork for culturingAcetabularia and Dr. Gerhard Thiel for critical reading of the manuscript.
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Smahel, M., Klieber, HG. & Gradmann, D. Vanadate-sensitive ATPase in the plasmalemma ofAcetabularia: biochemical and kinetic characterization. Planta 188, 62–69 (1992). https://doi.org/10.1007/BF01160713
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DOI: https://doi.org/10.1007/BF01160713