| pubmed-article:21610181 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0035567 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0005528 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0022023 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0596902 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0205182 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0596235 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0679932 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0597484 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C2346927 | lld:lifeskim |
| pubmed-article:21610181 | lifeskim:mentions | umls-concept:C0871161 | lld:lifeskim |
| pubmed-article:21610181 | pubmed:issue | 3 | lld:pubmed |
| pubmed-article:21610181 | pubmed:dateCreated | 2011-7-4 | lld:pubmed |
| pubmed-article:21610181 | pubmed:abstractText | 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 class II Na(+) transporter OsHKT2;1. The genetically tractable rice (Oryza sativa; background Nipponbare) possesses two predicted K(+)-transporting class II HKT transporter genes, OsHKT2;3 and OsHKT2;4. In this study, we have characterized the ion selectivity of the class II rice HKT transporter OsHKT2;4 in yeast and Xenopus laevis oocytes. OsHKT2;4 rescued the growth defect of a K(+) uptake-deficient yeast mutant. Green fluorescent protein-OsHKT2;4 is targeted to the plasma membrane in transgenic plant cells. OsHKT2;4-expressing oocytes exhibited strong K(+) permeability. Interestingly, however, K(+) influx in OsHKT2;4-expressing oocytes did not require stimulation by extracellular Na(+), in contrast to other class II HKT transporters. Furthermore, OsHKT2;4-mediated currents exhibited permeabilities to both Mg(2+) and Ca(2+) in the absence of competing K(+) ions. Comparative analyses of Ca(2+) and Mg(2+) permeabilities in several HKT transporters, including Arabidopsis thaliana HKT1;1 (AtHKT1;1), Triticum aestivum HKT2;1 (TaHKT2;1), OsHKT2;1, OsHKT2;2, and OsHKT2;4, revealed that only OsHKT2;4 and to a lesser degree TaHKT2;1 mediate Mg(2+) transport. Interestingly, cation competition analyses demonstrate that the selectivity of both of these class II HKT transporters for K(+) is dominant over divalent cations, suggesting that Mg(2+) and Ca(2+) transport via OsHKT2;4 may be small and would depend on competing K(+) concentrations in plants. | lld:pubmed |
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| pubmed-article:21610181 | pubmed:language | eng | lld:pubmed |
| pubmed-article:21610181 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:21610181 | pubmed:citationSubset | IM | lld:pubmed |
| pubmed-article:21610181 | pubmed:chemical | http://linkedlifedata.com/r... | lld:pubmed |
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| pubmed-article:21610181 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:21610181 | pubmed:month | Jul | lld:pubmed |
| pubmed-article:21610181 | pubmed:issn | 1532-2548 | lld:pubmed |
| pubmed-article:21610181 | pubmed:author | pubmed-author:Lo... | lld:pubmed |
| pubmed-article:21610181 | pubmed:author | pubmed-author:HorieTomoakiT | lld:pubmed |
| pubmed-article:21610181 | pubmed:author | pubmed-author:SchroederJuli... | lld:pubmed |
| pubmed-article:21610181 | pubmed:author | pubmed-author:KatsuharaMaki... | lld:pubmed |
| pubmed-article:21610181 | pubmed:author | pubmed-author:KanekoToshiyu... | lld:pubmed |
| pubmed-article:21610181 | pubmed:author | pubmed-author:CostaAlexA | lld:pubmed |
| pubmed-article:21610181 | pubmed:author | pubmed-author:BrodskyDennis... | lld:pubmed |
| pubmed-article:21610181 | pubmed:issnType | Electronic | lld:pubmed |
