Purification of PII and PII-UMP and In Vitro Studies of Regulation of Glutamine Synthetase in Rhodospirillum rubrum
AUTOR(ES)
Johansson, Magnus
FONTE
American Society for Microbiology
RESUMO
The PII protein from Rhodospirillum rubrum was fused with a histidine tag, overexpressed in Escherichia coli, and purified by Ni2+-chelating chromatography. The uridylylated form of the PII protein could be generated in E. coli. The effects on the regulation of glutamine synthetase by PII, PII-UMP, glutamine, and α-ketoglutarate were studied in extracts from R. rubrum grown under different conditions. PII and glutamine were shown to stimulate the ATP-dependent inactivation (adenylylation) of glutamine synthetase, which could be totally inhibited by α-ketoglutarate. Deadenylylation (activation) of glutamine synthetase required phosphate, but none of the effectors studied had any major effect, which is different from their role in the E. coli system. In addition, deadenylylation was found to be much slower than adenylylation under the conditions investigated.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=103790Documentos Relacionados
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