谷氨酸脱氢酶
谷氨酰胺合成酶
谷氨酰胺
谷氨酸合酶
生物化学
酶
氨基酸
新陈代谢
谷氨酸受体
生物
受体
作者
B. J. Miflin,R. M. Wallsgrove,Peter J. Lea
出处
期刊:Current Topics in Cellular Regulation
日期:1981-01-01
卷期号:: 1-43
被引量:26
标识
DOI:10.1016/b978-0-12-152820-1.50005-5
摘要
This chapter discusses metabolism and the role of glutamine in the flow of nitrogen. Under certain conditions, all the nitrogen assimilated by bacteria could pass through glutamine. The plant enzyme, in common with that from other sources, exhibits a number of activities that have been the basis of a number of different assays. In plants, as in other tissues, there are enzymes other than glutamine synthetase (GS) that may catalyze the transferase assay and thus, the assay is unlikely to be specific. The role of GS is highlighted by the build-up of glutamine at the expense of glutamate and other amino acids—as glutamate levels fall, presumably other free amino acids are transaminated to the available 2-oxoglutarate in an attempt to maintain the level of glutamate. Glutamate dehydrogenase (GDH) does not operate to assimilate NH3, even though the concentration of NH3 is greatly increased and there is an excess of 2-oxoglutarate.
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