Cation-activated ATPase activity of plasmalemma-enriched membrane preparations from maize coleoptiles |
| |
Authors: | Nicoletta Beffagna Erasmo Marre Sergio Mariano Cocucci |
| |
Institution: | (1) Centro di Studio del C.N.R. per la Biologia Cellulare e Molecolare delle Piante, Istituto di Scienze Botaniche, Università di Milano, Via Giuseppe Colombo, 60, I-20133 Milano, Italy;(2) Istituto di Chimica Agraria, Cattedra di Fisiologia Vegetale, Università di Milano, Via Celoria, 2, I-20133 Milano, Italy |
| |
Abstract: | The ATPase activity present in plasmalemma-enriched preparations from maize coleoptiles shows an optimum at pH 6, a strong dependence on Mg2+, and is stimulated by K+ and other monovalent cations, both organic and inorganic. The activation of ATPase by K+ obeys Michaelis Menten kinetics, saturation being reached at 50 mM K+ concentration. K+, Mg2+-stimulated ATPase activity is strongly inhibited by N,N-dicyclohexylcarbodiimide and by diethylstilbestrol and, to a lesser extent, by octylguanidine.Abbreviations DCCD
N,N-dicyclohexylcarbodiimide
- DES
diethylstilbestrol
- DTE
dithioerythritol
- Ellmans r
5-5 dithiobis (2 nitrobenzoic) acid
- FC
fusicoccin
- NPA
naphthylphthalamic acid
- OG
octylguanidine
- PCMBS
p-chloromercuribenzensulphonate |
| |
Keywords: | ATPase (activators inhibitors) Plasmalemma (ATPase) Zea |
本文献已被 SpringerLink 等数据库收录! |
|