期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 65, 期 19, 页码 5527-5534出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eru240
关键词
Arogenate; aromatic amino acids; aspartate; aspartate metabolic pathway; plastid; prephenate
资金
- Spanish 'Ministerio de Economia y Competitividad' [BIO2009-07490, BIO2012-33797]
- SUSTAINPINE Project - Plant KBBE programme, Scientific and Technological Cooperation in Plant Genome Research [PLE2009-0016]
In the chloroplasts and in non-green plastids of plants, aspartate is the precursor for the biosynthesis of different amino acids and derived metabolites that play distinct and important roles in plant growth, reproduction, development or defence. Aspartate biosynthesis is mediated by the enzyme aspartate aminotransferase (EC 2.6.1.1), which catalyses the reversible transamination between glutamate and oxaloacetate to generate aspartate and 2-oxoglutarate. Plastids contain two aspartate aminotransferases: a eukaryotic-type and a prokaryotic-type bifunctional enzyme displaying aspartate and prephenate aminotransferase activities. A general overview of the biochemistry, regulation, functional significance, and phylogenetic origin of both enzymes is presented. The roles of these plastidic aminotransferases in the biosynthesis of essential amino acids are discussed.
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