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- W2044825089 abstract "The complex ATP-activation kinetics of plant H+-ATPase requires two ATP effects on the enzyme. They may result from the simultaneous existence of two ATP sites or a single site that consecutively changes its properties. We describe here three main models for ATP binding to the plant H+-ATPase. Considering the experimental data there are some restrictions in their application. A system with two simultaneous catalytic sites with cooperative binding is possible provided the substrate exerts regulatory properties, and when ES (or SE) leads to a slower velocity path than SES (v1 < v2). In other words, simple cooperativity does not work. A system with two substrate sites, one of which is catalytic and the other is always and only regulatory (i.e. it affects the overall reaction rate), offers two alternatives: one with potential cooperative binding (the system does not discriminate between binding to the catalytic and regulatory sites; and the other with intrinsically different affinities of catalytic and regulatory sites (i.e. the system discriminates between binding to the two binding sites). Here it is also obligatory that ES (or SE) leads to a slower-velocity path than SES (v1 < v2). Thirdly, a system is possible with single ATP domain that is consecutively catalytic and regulatory as the cycle proceeds. These three mechanisms give rise to equivalent rate equations. Therefore, there is no way to distinguish between them on the basis of kinetic studies. Another conclusion drawn from modeling these schemes is that the form of the plots might resemble but not correspond to certain cooperativity type. For instance, for two substrate sites, a true negative cooperativity for substrate binding can mimic positive cooperativity if the v1 velocity pathway is much slower than the v2 one." @default.
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- W2044825089 date "1997-05-15" @default.
- W2044825089 modified "2023-09-27" @default.
- W2044825089 title "Complex ATP-Activation Kinetics of Plant H+-Transporting ATPase may or may not Require Two Substrate Sites" @default.
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- W2044825089 doi "https://doi.org/10.1111/j.1432-1033.1997.00228.x" @default.
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