Passive nitrate transport by root plasma membrane vesicles exhibits an acidic optimal pH like the H-ATPase
Plant Physiology, ISSN: 0032-0889, Vol: 122, Issue: 1, Page: 265-273
2000
- 13Citations
- 27Captures
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
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Metrics Details
- Citations13
- Citation Indexes13
- 13
- CrossRef12
- Captures27
- Readers27
- 27
Article Description
The net initial passive flux (J(Ni)) in reconstituted plasma membrane (PM) vesicles from maize (Zea mays) root cells was measured as recently described (P. Pouliquin, J.-P. Grouzis, R. Gibrat [1999] Biophys J 76: 360-373). J(Ni) in control liposomes responded to membrane potential or to NO as expected from the Goldman-Hodgkin-Katz diffusion theory. J(Ni) in reconstituted PM vesicles exhibited an additional component (J(Nif)), which was saturable (K(m) for NO approximately 3 mM, with J(Nifmax) corresponding to 60 x 10 mol m s at the native PM level) and selective (NO = ClO > Br > Cl = NO; relative fluxes at 5 mM: 1:0.34:0.19). J(Nif) was totally inhibited by La and the arginine reagent phenylglyoxal. J(Nif) was voltage dependent, with an optimum voltage at 105 mV at pH 6.5. The activation energy of J(Nif) was high (129 kJ mol), close to that of the H-ATPase (155 kJ mol), and J(Nif) displayed the same acidic optimal pH (pH 6.5) as that of the H pump. This is the first example, to our knowledge, of a secondary transport at the plant PM with such a feature. Several properties of the NO uniport seem poorly compatible with that reported for plant anion channels and to be attributable instead to a classical carrier. The physiological relevance of these findings is suggested.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0033764867&origin=inward; http://dx.doi.org/10.1104/pp.122.1.265; http://www.ncbi.nlm.nih.gov/pubmed/10631270; https://academic.oup.com/plphys/article/122/1/265/6091935; https://dx.doi.org/10.1104/pp.122.1.265; https://academic.oup.com/plphys/article-abstract/122/1/265/6091935?redirectedFrom=fulltext
Oxford University Press (OUP)
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