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Gene Review

AMT2  -  ammonium transporter 2

Arabidopsis thaliana

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High impact information on ATAMT2

  • Open reading frame sll0108 (amt1) was responsible for a high affinity uptake activity (Ks for methylammonium, 2.7 microM), whereas open reading frames sll1017 (amt2) and sll0537 (amt3) made minor contributions to uptake at low substrate concentrations [1].
  • Transient expression of an AtAMT2-green fluorescent protein fusion protein in Arabidopsis leaf epidermal cells indicated a plasma membrane location for the AtAMT2 protein [2].
  • Although expression of AtAMT2 in shoots responded little to changes in root N status, transcript levels in leaves declined under high CO(2) conditions [2].
  • However, a dramatic reduction in the level of AtAMT2 transcript brought about by dsRNA interference with gene expression had no obvious effect on plant growth or development, under the conditions tested [2].
  • The AtAMT2 gene was expressed in all organs of Arabidopsis and was subject to nitrogen (N) regulation, at least in roots where expression was partially repressed by high concentrations of ammonium nitrate and derepressed in the absence of external N [2].

Anatomical context of ATAMT2


Associations of ATAMT2 with chemical compounds

  • In contrast to transporters of the AMT1 family, however, AtAMT2 did not transport the ammonium analogue, methylammonium [3].

Other interactions of ATAMT2


  1. Ammonium/methylammonium permeases of a Cyanobacterium. Identification and analysis of three nitrogen-regulated amt genes in synechocystis sp. PCC 6803. Montesinos, M.L., Muro-Pastor, A.M., Herrero, A., Flores, E. J. Biol. Chem. (1998) [Pubmed]
  2. Characterization of Arabidopsis AtAMT2, a high-affinity ammonium transporter of the plasma membrane. Sohlenkamp, C., Wood, C.C., Roeb, G.W., Udvardi, M.K. Plant Physiol. (2002) [Pubmed]
  3. Characterization of Arabidopsis AtAMT2, a novel ammonium transporter in plants. Sohlenkamp, C., Shelden, M., Howitt, S., Udvardi, M. FEBS Lett. (2000) [Pubmed]
  4. Molecular and cellular characterisation of LjAMT2;1, an ammonium transporter from the model legume Lotus japonicus. Simon-Rosin, U., Wood, C., Udvardi, M.K. Plant Mol. Biol. (2003) [Pubmed]
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