Click here to close
Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly.
We suggest using a current version of Chrome,
FireFox, or Safari.
Expression of the cation transporter McHKT1 in a halophyte.
Su H
,
Balderas E
,
Vera-Estrella R
,
Golldack D
,
Quigley F
,
Zhao C
,
Pantoja O
,
Bohnert HJ
.
???displayArticle.abstract???
From the ice plant, Mesembryanthemum crystallinum, McHKT1 was isolated encoding a protein 41-61% identical to other plant HKT1-like sequences previously described as potassium or sodium/potassium transporters. McHKT1 acts as a potassium transporter in yeast with specificity similar to that of wheat HKT1. In Xenopus oocytes it transports cations with a specificity Rb+ > Cs+ > [K+ = Na+ = Li+]. McHKT1 is exclusively localized to the plasma membrane. The isoform isolated is most highly expressed in leaves and is present in stems, flowers and seed pods but absent from the root where, according to immunological data, a second isoform exists which does not cross-hybridize with the leaf form in RNA blots at high stringency. McHKT1 transcript amounts increase during the first 6-10 h of stress and then decline to pre-stress levels with kinetics reminiscent of the initial influx of sodium into this halophyte. Immunocytological localization showed strong signals in the leaf vasculature and surrounding mesophyll cells but low-intensity signals are also detected in other cell types. In roots, McHKT is mainly confined to endodermis and stele. Possible functions of McHKT1 in ion homeostasis in the halophytic ice plant are discussed.
Apse,
Salt tolerance conferred by overexpression of a vacuolar Na+/H+ antiport in Arabidopsis.
1999, Pubmed
Apse,
Salt tolerance conferred by overexpression of a vacuolar Na+/H+ antiport in Arabidopsis.
1999,
Pubmed
Berthomieu,
Functional analysis of AtHKT1 in Arabidopsis shows that Na(+) recirculation by the phloem is crucial for salt tolerance.
2003,
Pubmed
,
Xenbase
Blumwald,
Sodium transport in plant cells.
2000,
Pubmed
Chauhan,
Na+/myo-inositol symporters and Na+/H+-antiport in Mesembryanthemum crystallinum.
2000,
Pubmed
Demidchik,
Sodium fluxes through nonselective cation channels in the plasma membrane of protoplasts from Arabidopsis roots.
2002,
Pubmed
Diatloff,
Site directed mutagenesis reduces the Na+ affinity of HKT1, an Na+ energized high affinity K+ transporter.
1998,
Pubmed
Durell,
Structural models of the KtrB, TrkH, and Trk1,2 symporters based on the structure of the KcsA K(+) channel.
1999,
Pubmed
Durell,
Evolutionary relationship between K(+) channels and symporters.
1999,
Pubmed
Epstein,
RESOLUTION OF DUAL MECHANISMS OF POTASSIUM ABSORPTION BY BARLEY ROOTS.
1963,
Pubmed
Fairbairn,
Characterisation of two distinct HKT1-like potassium transporters from Eucalyptus camaldulensis.
2000,
Pubmed
,
Xenbase
Fu,
AtKuP1: a dual-affinity K+ transporter from Arabidopsis.
1998,
Pubmed
Gassman,
Alkali cation selectivity of the wheat root high-affinity potassium transporter HKT1.
1996,
Pubmed
,
Xenbase
Gassmann,
Inward-Rectifying K+ Channels in Root Hairs of Wheat (A Mechanism for Aluminum-Sensitive Low-Affinity K+ Uptake and Membrane Potential Control).
1994,
Pubmed
Gaxiola,
The Arabidopsis thaliana proton transporters, AtNhx1 and Avp1, can function in cation detoxification in yeast.
1999,
Pubmed
Golldack,
Characterization of a HKT-type transporter in rice as a general alkali cation transporter.
2002,
Pubmed
,
Xenbase
Horie,
Two types of HKT transporters with different properties of Na+ and K+ transport in Oryza sativa.
2001,
Pubmed
,
Xenbase
Kato,
Evidence in support of a four transmembrane-pore-transmembrane topology model for the Arabidopsis thaliana Na+/K+ translocating AtHKT1 protein, a member of the superfamily of K+ transporters.
2001,
Pubmed
,
Xenbase
Kim,
AtKUP1: an Arabidopsis gene encoding high-affinity potassium transport activity.
1998,
Pubmed
,
Xenbase
Kirch,
Expression of water channel proteins in Mesembryanthemum crystallinum.
2000,
Pubmed
Kochian,
Potassium transport in corn roots : I. Resolution of kinetics into a saturable and linear component.
1982,
Pubmed
Laurie,
A role for HKT1 in sodium uptake by wheat roots.
2002,
Pubmed
Liu,
Characterization of two HKT1 homologues from Eucalyptus camaldulensis that display intrinsic osmosensing capability.
2001,
Pubmed
,
Xenbase
Maathuis,
The Physiological Relevance of Na+-Coupled K+-Transport.
1996,
Pubmed
Maathuis,
Sodium uptake in Arabidopsis roots is regulated by cyclic nucleotides.
2001,
Pubmed
Mäser,
Altered shoot/root Na+ distribution and bifurcating salt sensitivity in Arabidopsis by genetic disruption of the Na+ transporter AtHKT1.
2002,
Pubmed
Mäser,
Glycine residues in potassium channel-like selectivity filters determine potassium selectivity in four-loop-per-subunit HKT transporters from plants.
2002,
Pubmed
,
Xenbase
Nelson,
Regulation of cell-specific inositol metabolism and transport in plant salinity tolerance.
1998,
Pubmed
Niu,
Ion Homeostasis in NaCl Stress Environments.
1995,
Pubmed
Rodríguez-Navarro,
Potassium transport in fungi and plants.
2000,
Pubmed
Rubio,
Genetic selection of mutations in the high affinity K+ transporter HKT1 that define functions of a loop site for reduced Na+ permeability and increased Na+ tolerance.
1999,
Pubmed
,
Xenbase
Rubio,
Sodium-driven potassium uptake by the plant potassium transporter HKT1 and mutations conferring salt tolerance.
1995,
Pubmed
,
Xenbase
Rus,
AtHKT1 is a salt tolerance determinant that controls Na(+) entry into plant roots.
2001,
Pubmed
Santa-María,
The HAK1 gene of barley is a member of a large gene family and encodes a high-affinity potassium transporter.
1997,
Pubmed
Schachtman,
Expression of an inward-rectifying potassium channel by the Arabidopsis KAT1 cDNA.
1992,
Pubmed
,
Xenbase
Schachtman,
Molecular pieces to the puzzle of the interaction between potassium and sodium uptake in plants.
1999,
Pubmed
Serrano,
Ion homeostasis during salt stress in plants.
2001,
Pubmed
Shi,
The Arabidopsis thaliana salt tolerance gene SOS1 encodes a putative Na+/H+ antiporter.
2000,
Pubmed
Shi,
The putative plasma membrane Na(+)/H(+) antiporter SOS1 controls long-distance Na(+) transport in plants.
2002,
Pubmed
Su,
Expression and stress-dependent induction of potassium channel transcripts in the common ice plant.
2001,
Pubmed
Su,
The expression of HAK-type K(+) transporters is regulated in response to salinity stress in common ice plant.
2002,
Pubmed
Uozumi,
The Arabidopsis HKT1 gene homolog mediates inward Na(+) currents in xenopus laevis oocytes and Na(+) uptake in Saccharomyces cerevisiae.
2000,
Pubmed
,
Xenbase
Uozumi,
Identification of strong modifications in cation selectivity in an Arabidopsis inward rectifying potassium channel by mutant selection in yeast.
1995,
Pubmed
,
Xenbase
Vera-Estrella,
Salt stress in Mesembryanthemum crystallinum L. cell suspensions activates adaptive mechanisms similar to those observed in the whole plant.
1999,
Pubmed
Wang,
Rapid Up-regulation of HKT1, a high-affinity potassium transporter gene, in roots of barley and wheat following withdrawal of potassium.
1998,
Pubmed
Yokoi,
Differential expression and function of Arabidopsis thaliana NHX Na+/H+ antiporters in the salt stress response.
2002,
Pubmed
Yool,
Alteration of ionic selectivity of a K+ channel by mutation of the H5 region.
1991,
Pubmed
,
Xenbase
