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Metabolite regulation of the interaction between Arabidopsis thaliana PII and N-acetyl-l-glutamate kinase.

Biochem Biophys Res Commun. 2009 Oct 02;387(4):700-4. Epub 2009 Jul 23
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摘要


The metabolic control of the interaction between ArabidopsisN-acetyl-l-glutamate kinase (NAGK) and the PII protein has been studied. Both gel exclusion and affinity chromatography analyses of recombinant, affinity-purified PII (trimeric complex) and NAGK (hexameric complex) showed that NAGK strongly interacted with PII only in the presence of Mg-ATP, and that this process was reversed by 2-oxoglutarate (2-OG). Furthermore, metabolites such as arginine, glutamate, citrate, and oxalacetate also exerted a negative effect on the PII-NAGK complex formation in the presence of Mg-ATP. Using chloroplast protein extracts and PII affinity chromatography, NAGK interacted with PII only in the presence of ATP-Mg(2+), and this process was antagonized by 2-OG. These results reveal a complex metabolic control of the PII interaction with NAGK in the chloroplast stroma of higher plants.

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