Identification of three urease accessory proteins that are required for urease activation in Arabidopsis

Witte C-P, Rosso MG, Romeis T (2005)
Plant Physiology 139(3): 1155-1162.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
Urease is a nickel-containing urea hydrolase involved in nitrogen recycling from ureide, purine, and arginine catabolism in plants. The process of urease activation by incorporation of nickel into the active site is a prime example of chaperone-mediated metal transfer to an enzyme. Four urease accessory proteins are required for activation in Klebsiella aerogenes. In plants urease accessory proteins have so far been only partially defined. Using reverse genetic tools we identified four genes that are necessary for urease activity in Arabidopsis (Arabidopsis thaliana; ecotypes Columbia and Nössen). Plants bearing T-DNA or Ds element insertions in either the structural gene for urease or in any of the three putative urease accessory genes AtureD, AtureF, and AtureG lacked the corresponding mRNAs and were defective in urease activity. In contrast to wild-type plants, the mutant lines were not able to support growth with urea as the sole nitrogen source. To investigate whether the identified accessory proteins would be sufficient to support eukaryotic urease activation, the corresponding cDNAs were introduced into urease-negative Escherichia coli. In these bacteria, urease activity was observed only when all three plant accessory genes were coexpressed together with the plant urease gene. Remarkably, plant urease activation occurred as well in cell-free E. coli extracts, but only in extracts from cells that had expressed all three accessory proteins. The future molecular dissection of the plant urease activation process may therefore be performed in vitro, providing a powerful tool to further our understanding of the biochemistry of chaperone-mediated metal transfer processes in plants.
Stichworte
Nitrates; Mutation; Quaternary Ammonium Compounds; Reverse Transcriptase Polymerase Chain Reaction; Enzyme Activation; Escherichia coli; Molecular Sequence Data; RNA; Arabidopsis Proteins; Arabidopsis; Messenger; Urease; Urea
Erscheinungsjahr
2005
Zeitschriftentitel
Plant Physiology
Band
139
Ausgabe
3
Seite(n)
1155-1162
ISSN
0032-0889
eISSN
1532-2548
Page URI
https://pub.uni-bielefeld.de/record/1996259

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Witte C-P, Rosso MG, Romeis T. Identification of three urease accessory proteins that are required for urease activation in Arabidopsis. Plant Physiology. 2005;139(3):1155-1162.
Witte, C. - P., Rosso, M. G., & Romeis, T. (2005). Identification of three urease accessory proteins that are required for urease activation in Arabidopsis. Plant Physiology, 139(3), 1155-1162. doi:10.1104/pp.105.070292
Witte, C. - P., Rosso, M. G., and Romeis, T. (2005). Identification of three urease accessory proteins that are required for urease activation in Arabidopsis. Plant Physiology 139, 1155-1162.
Witte, C.-P., Rosso, M.G., & Romeis, T., 2005. Identification of three urease accessory proteins that are required for urease activation in Arabidopsis. Plant Physiology, 139(3), p 1155-1162.
C.-P. Witte, M.G. Rosso, and T. Romeis, “Identification of three urease accessory proteins that are required for urease activation in Arabidopsis”, Plant Physiology, vol. 139, 2005, pp. 1155-1162.
Witte, C.-P., Rosso, M.G., Romeis, T.: Identification of three urease accessory proteins that are required for urease activation in Arabidopsis. Plant Physiology. 139, 1155-1162 (2005).
Witte, Claus-Peter, Rosso, Mario G., and Romeis, Tina. “Identification of three urease accessory proteins that are required for urease activation in Arabidopsis”. Plant Physiology 139.3 (2005): 1155-1162.

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