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. 1974 Oct;54(4):550–555. doi: 10.1104/pp.54.4.550

The Location of Nitrite Reductase and Other Enzymes Related to Amino Acid Biosynthesis in the Plastids of Root and Leaves 1

Benjamin J Miflin a,2
PMCID: PMC367451  PMID: 16658926

Abstract

Density gradient separation of plastids from leaf and root tissue was carried out. The distribution in the gradients of the activity of the following enzymes was determined: nitrite reductase, glutamine synthetase, acetolactate synthetase, aspartate aminotransferase, catalase, cytochrome oxidase, and triosephosphate isomerase. The distribution of chlorophyll was followed in gradients from leaf tissue. The presence of plastids that have retained their stroma enzymes was denoted by a peak of triosephosphate isomerase activity. Coincidental with this peak were bands of nitrite reductase, acetolactate synthetase, glutamine synthetase, and aspartate aminotransferase activity. The results suggest that most, if not all, the nitrite reductase and acetolactate synthetase activity of the cell is in the plastids. The plastids were found to contain only part of the total glutamine synthetase, aspartate aminotransferase, and triosephosphate dehydrogenase activity in the cell. Some evidence was obtained for low levels of glutamate dehydrogenase activity in chloroplasts.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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