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. 1984 Apr;74(4):822–826. doi: 10.1104/pp.74.4.822

Amino Acid Metabolism in Pea Leaves 1

Utilization of Nitrogen from Amide and Amino Groups of [15N]Asparagine

Trung Chanh Ta 1, Kenneth W Joy 1, Robert J Ireland 1
PMCID: PMC1066775  PMID: 16663517

Abstract

The flow of nitrogen from the amino and amide groups of asparagine has been followed in young pea (Pisum sativum CV Little Marvel) leaves, supplied through the xylem with 15N-labeled asparagine. The results confirm that there are two main routes for asparagine metabolism: deamidation and transamination.

Nitrogen from the amide group is found predominantly in 2-hydroxy-succinamic acid (derived from transamination of asparagine) and in the amide group of glutamine. The amide nitrogen is also found in glutamate and dispersed through a range of amino acids. Transfer to glutamineamide results from assimilation of ammonia produced by deamidation of both asparagine and its transamination products: this assimilation is blocked by methionine sulfoximine. The release of amide nitrogen as ammonia is greatly reduced by aminooxyacetate, suggesting that, for much of the metabolized asparagine, transamination precedes deamidation.

The amino group of asparagine is widely distributed in amino acids, especially aspartate, glutamate, alanine, and homoserine. For homoserine, a comparison of N and C labeling, and use of a transaminase inhibitor, suggests that it is not produced from the main pool of aspartate, and transamination may play a role in the accumulation of homoserine in peas.

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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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