The Rice Monovalent Cation Transporter OsHKT2;4: Revisited Ionic Selectivity1[W]
نویسندگان
چکیده
Biochimie et Physiologie Moléculaire des Plantes, Unité Mixte de Recherche, 5004 Centre National de la Recherche Scientifique/386 Institut National de la Recherche Agronomique/SupAgro-M/Université Montpellier 2, Campus SupAgro-M/Institut National de la Recherche Agronomique, 34060 Montpellier cedex 2, France (A.S., I.K., B.M., I.G., H.S., A.-A.V.); and Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes, 34398 Montpellier cedex 5, France (D.M.)
منابع مشابه
Running Head: the Rice Oshkt2;4 Monovalent Cation Transporter the Rice Monovalent Cation Transporter Oshkt2;4: Revisited Ionic Selectivity
The family of plant membrane transporters named HKT (for High-affinity K + Transporters) can be subdivided into sub-families 1 and 2, which respectively comprise Na +-selective transporters and transporters able to function as Na +-K + symporters, at least when expressed in yeast or Xenopus oocytes. Surprisingly, a subfamily 2 member from rice (Oryza sativa),
متن کاملThe rice monovalent cation transporter OsHKT2;4: revisited ionic selectivity.
The family of plant membrane transporters named HKT (for high-affinity K(+) transporters) can be subdivided into subfamilies 1 and 2, which, respectively, comprise Na(+)-selective transporters and transporters able to function as Na(+)-K(+) symporters, at least when expressed in yeast (Saccharomyces cerevisiae) or Xenopus oocytes. Surprisingly, a subfamily 2 member from rice (Oryza sativa), OsH...
متن کاملK+ transport by the OsHKT2;4 transporter from rice with atypical Na+ transport properties and competition in permeation of K+ over Mg2+ and Ca2+ ions.
Members of class II of the HKT transporters, which have thus far only been isolated from grasses, were found to mediate Na(+)-K(+) cotransport and at high Na(+) concentrations preferred Na(+)-selective transport, depending on the ionic conditions. But the physiological functions of this K(+)-transporting class II of HKT transporters remain unknown in plants, with the exception of the unique cla...
متن کاملThe Rice High-Affinity K+ Transporter OsHKT2;4 Mediates Mg2+ Homeostasis under High-Mg2+ Conditions in Transgenic Arabidopsis
Rice (Oryza sativa; background Nipponbare) contains nine HKT (high-affinity K+ transport)-like genes encoding membrane proteins belonging to the superfamily of Ktr/TRK/HKT. OsHKTs have been proposed to include four selectivity filter-pore-forming domains homologous to the bacterial K+ channel KcsA, and are separated into OsHKT1s with Na+-selective activity and OsHKT2s with Na+-K+ symport activi...
متن کاملSize-dependent allosteric effects of monovalent cations on rabbit liver fructose-1,6-bisphosphatase.
Effects of monovalent cations on the neutral rabbit liver fructose-1,6-bisphosphatase are multifunctional and dependent on their nonhydrated ionic size. (a) The maximal velocity is increased by addition of monovalent cations with the optimum stimulation occurring with a nonhydrated ionic radius of 1.2 A in the presence of a chelating agent such as EDTA. (B) Activation curves are sigmoidal with ...
متن کامل