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Gene Review

KAT2  -  potassium channel KAT2

Arabidopsis thaliana

Synonyms: T9A21.140, T9A21_140, VOLTAGE-GATED POTASSIUM CHANNEL 2, potassium channel in Arabidopsis thaliana 2
 
 
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High impact information on KAT2

  • In contrast to KAT1- and KAT2-type K(+) channels, however, KZM1 currents were insensitive to external pH changes [1].
  • Expression in Xenopus laevis oocytes indicated that SIRK is an inwardly rectifying channel displaying functional properties very similar to those of KAT2 [2].
  • Analysis of gene co-expression clusters in Arabidopsis suggests a role for peroxisomal KAT2 in beta-oxidation, while KAT5 co-expresses with genes of the flavonoid biosynthesis pathway and cytosolic ACAT2 clearly co-expresses with genes of the cytosolic mevalonate biosynthesis pathway [3].
 

Anatomical context of KAT2

  • Coexpression in Xenopus oocytes and two-hybrid experiments indicated that KAT1 and KAT2 can form heteromultimeric channels [4].
 

Other interactions of KAT2

  • More than KAT1, KAT2 displays functional features resembling those of native inward K(+) channels in guard cells [4].

References

  1. The K+ channel KZM1 mediates potassium uptake into the phloem and guard cells of the C4 grass Zea mays. Philippar, K., Büchsenschutz, K., Abshagen, M., Fuchs, I., Geiger, D., Lacombe, B., Hedrich, R. J. Biol. Chem. (2003) [Pubmed]
  2. A grapevine gene encoding a guard cell K(+) channel displays developmental regulation in the grapevine berry. Pratelli, R., Lacombe, B., Torregrosa, L., Gaymard, F., Romieu, C., Thibaud, J.B., Sentenac, H. Plant Physiol. (2002) [Pubmed]
  3. Nine 3-ketoacyl-CoA thiolases (KATs) and acetoacetyl-CoA thiolases (ACATs) encoded by five genes in Arabidopsis thaliana are targeted either to peroxisomes or cytosol but not to mitochondria. Carrie, C., Murcha, M.W., Millar, A.H., Smith, S.M., Whelan, J. Plant Mol. Biol. (2007) [Pubmed]
  4. Guard cell inward K+ channel activity in arabidopsis involves expression of the twin channel subunits KAT1 and KAT2. Pilot, G., Lacombe, B., Gaymard, F., Cherel, I., Boucherez, J., Thibaud, J.B., Sentenac, H. J. Biol. Chem. (2001) [Pubmed]
 
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