Claim · model-written summary
At pH 5.5 native enzyme activation ranked Zn > Mn > Mg.
- Taxon
- corn
Zea mays subsp. mayst0 - Outcome
- Zn > Mn > Mge0
- Qualifier
- pH 5.5e0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the order of Zn > Mn > Mg at pH 5.5 for total metal ion concentrations not higher than 3.0 mM”
t0“corn root”
Title
Regulatory effects of zinc on corn root plasma membrane H+‐ATPase
VERENA KASTRUP; SABINE STEIGER; ULRICH LÜTTGE; et al. New Phytologist 1996. doi:10.1111/j.1469-8137.1996.tb01146.x
Other claims from this paper (13)
- Intervention effect Zn stimulated H+-ATPase activity.
- Intervention effect Mg stimulated H+-ATPase activity.
- Intervention effect Mn stimulated H+-ATPase activity.
- Mechanism Calculations indicated ZnATP+ serves as a substrate for the enzyme.
- Observation At pH 6.5 native enzyme activation ranked Mg > Mn > Zn.
- Intervention effect A Zn: ATP ratio of 0.6 at pH 5.5 yielded over 100% of Mg-dependent ATPase activity.
- Intervention effect Free Zn2+ inhibited ATP hydrolysis.
- Intervention effect Free Zn2+ inhibited H+ transport.
- Intervention effect At pH 55, 1 mM ZnSO4 did not inhibit ATP hydrolysis.
- Intervention effect At pH 6.5, 1 mM zinc lowered native enzyme activity to 49% of control.
- Intervention effect At pH 6.5, 1 mM zinc lowered purified enzyme activity to 34% of control.
- Association pH strongly affected zinc-complex activation of native and partly purified H+-ATPase.
- Association pH strongly affected free-zinc inhibition of native and partly purified H+-ATPase.