PMID: 11912233Mar 26, 2002Paper

Enzyme redundancy and the importance of 2-oxoglutarate in plant ammonium assimilation

Journal of Experimental Botany
Michael Hodges

Abstract

Ammonium is the reduced nitrogen form available to plants for assimilation into amino acids. This is achieved by the GS/GOGAT pathway that requires carbon skeletons in the form of 2-oxoglutarate. To date, the exact enzymatic origin of this organic acid for plant ammonium assimilation is unknown. Isocitrate dehydrogenases and aspartate aminotransferases have been proposed to carry out this function. Since different (iso)forms located in several subcellular compartments are present within a plant cell, recent efforts have concentrated on evaluating the involvement of these enzymes in ammonium assimilation. Furthermore, several observations indicate that 2-oxoglutarate is a good candidate as a metabolic signal to regulate the co-ordination of C and N metabolism. This will be discussed with respect to recent advances in bacterial signalling processes involving a 2-oxoglutarate binding protein called PII.

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Citations

Sep 23, 2010·Planta·Juan Jesús Molina-RuedaFernando Gallardo
Sep 7, 2005·Photosynthesis Research·Francisco R CantónFrancisco M Cánovas
Mar 9, 2004·Trends in Plant Science·Nathalie PicaultFerdinando Palmieri
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Jun 30, 2005·Proceedings of the National Academy of Sciences of the United States of America·Sophie LaurentCheng-Cai Zhang
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Jun 1, 2012·Plant, Cell & Environment·Guillaume TcherkezRichard Bligny

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