Gálvez S, Lancien M, Hodges M. Are isocitrate dehydrogenases and 2-oxoglutarate involved in the regulation of glutamate synthesis?
TRENDS IN PLANT SCIENCE 1999;
4:484-490. [PMID:
10562733 DOI:
10.1016/s1360-1385(99)01500-9]
[Citation(s) in RCA: 60] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In plants, nitrogen assimilation into amino acids relies on the availability of the reduced form of nitrogen, ammonium. The glutamine synthetase-glutamate synthase pathway, which requires carbon skeletons in the form of 2-oxoglutarate, achieves this. To date, the exact enzymatic origin of 2-oxoglutarate for plant ammonium assimilation is unknown. Isocitrate dehydrogenases synthesize 2-oxoglutarate. Recent efforts have concentrated on evaluating the involvement of different isocitrate dehydrogenases, distinguished by co-factor specificity and sub-cellular localization. Furthermore, several observations indicate that 2-oxoglutarate is likely to be a metabolic signal that regulates the coordination of carbon:nitrogen metabolism. This is discussed in the context of recent advances in bacterial signalling processes.
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