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CABI Book Chapter

Amino acids in higher plants.

Book cover for Amino acids in higher plants.

Description

This book, divided into 5 parts, deals with topics on amino acids in higher plants. Part I (enzymes and metabolism) contains 16 chapters pursuing the theme of amino acid metabolism through the driving actions of the principal enzymes, emphasizing recent advances particularly with reference to localization, biophysical characterization and regulation. Part II (dynamics) includes two chapters design...

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Chapter 9 (Page no: 156)

Ornithine: at the crossroads of multiple paths to amino acids and polyamines.

After the 20 amino acids that make up the proteins in all living organisms, ornithine perhaps occupies the most critical position among the non-protein amino acids. It sits at the crossroads of interconversions of glutamate and arginine on the one hand and the production of proline, polyamines and several alkaloids on the other: all products of tremendous importance to living cells. While ornithine is typically not an abundant amino acid, the metabolic flux of nitrogen through this amino acid is presumably quite rapid because of the cellular contents of the products for which it serves as the substrate. Our current knowledge of the regulation of ornithine biosynthesis is rather limited and mostly dependent upon the research targeted at understanding arginine and proline metabolism, and to some extent polyamine and alkaloid biosynthesis. Whereas most of the ornithine biosynthesis in animals occurs on the way to the production of glutamate, proline and putrescine from dietary arginine, in plants the pathway works in the reverse order, i.e. glutamate, the first product of nitrogen assimilation is the primary source of arginine, proline and putrescine. An understanding of the regulation of ornithine metabolism could help us in the genetic manipulation of plants for stress tolerance (via manipulation of proline and γ-aminobutyric acid, and the polyamine pathway), as well as in nutritional improvement (the cellular contents of important amino acids-arginine and citrulline among others). Based upon the recent observations of a strong connection between polyamine biosynthesis, ornithine metabolism and glutamic acid metabolism, it can be proposed that ornithine may act as a controlling metabolite to enhance nitrogen assimilation and, consequently, increased carbon assimilation.

Other chapters from this book

Chapter: 1 (Page no: 1) Glutamate dehydrogenase. Author(s): Osuji, G. O. Madu, W. C.
Chapter: 2 (Page no: 30) Alanine aminotransferase: amino acid metabolism in higher plants. Author(s): Raychaudhuri, A.
Chapter: 3 (Page no: 57) Aspartate aminotransferase. Author(s): Leasure, C. D. He, Z. H.
Chapter: 4 (Page no: 68) Tyrosine aminotransferase. Author(s): Hudson, A. O.
Chapter: 5 (Page no: 82) An insight into the role and regulation of glutamine synthetase in plants. Author(s): Sengupta-Gopalan, C. Ortega, J. L.
Chapter: 6 (Page no: 100) Asparagine synthetase. Author(s): Duff, S. M. G.
Chapter: 7 (Page no: 129) Glutamate decarboxylase. Author(s): Molina-Rueda, J. J. Garrido-Aranda, A. Gallardo, F.
Chapter: 8 (Page no: 142) L-arginine-dependent nitric oxide synthase activity. Author(s): Corpas, F. J. Río, L. A. del Palma, J. M. Barroso, J. B.
Chapter: 10 (Page no: 177) Polyamines in plants: biosynthesis from arginine, and metabolic, physiological and stress-response roles. Author(s): Mattoo, A. K. Fatima, T. Upadhyay, R. K. Handa, A. K.
Chapter: 11 (Page no: 195) Serine acetyltransferase. Author(s): Watanabe, M. Hubberten, H. M. Saito, K. Hoefgen, R.
Chapter: 12 (Page no: 219) Cysteine homeostasis. Author(s): García, I. Romero, L. C. Gotor, C.
Chapter: 13 (Page no: 234) Lysine metabolism. Author(s): Medici, L. O. Nazareno, A. C. Gaziola, S. A. Schmidt, D. Azevedo, R. A.
Chapter: 14 (Page no: 251) Histidine. Author(s): Ingle, R. A.
Chapter: 15 (Page no: 262) Amino acid synthesis under abiotic stress. Author(s): Planchet, E. Limami, A. M.
Chapter: 16 (Page no: 277) The central role of glutamate and aspartate in the post-translational control of respiration and nitrogen assimilation in plant cells. Author(s): O'Leary, B. Plaxton, W. C.
Chapter: 17 (Page no: 298) Amino acid export in plants. Author(s): Price, M. B. Okumoto, S.
Chapter: 18 (Page no: 315) Uptake, transport and redistribution of amino nitrogen in woody plants. Author(s): Pfautsch, S. Bell, T. L. Gessler, A.
Chapter: 19 (Page no: 340) Auxin biosynthesis. Author(s): Chandler, J. W.
Chapter: 20 (Page no: 362) Involvement of tryptophan-pathway-derived secondary metabolism in the defence responses of grasses. Author(s): Ishihara, A. Matsukawa, T. Nomura, T. Sue, M. Oikawa, A. Okazaki, Y. Tebayashi, S.
Chapter: 21 (Page no: 390) Melatonin: synthesis from tryptophan and its role in higher plant. Author(s): Arnao, M. B. Hernández-Ruiz, J.
Chapter: 22 (Page no: 436) Glucosinolate biosynthesis from amino acids. Author(s): Stotz, H. U. Brown, P. D. Tokuhisa, J.
Chapter: 23 (Page no: 448) Natural toxins that affect plant amino acid metabolism. Author(s): Duke, S. O. Dayan, F. E.
Chapter: 24 (Page no: 461) Glyphosate: the fate and toxicology of a herbicidal amino acid derivative. Author(s): Saltmiras, D. A. Farmer, D. R. Mehrsheikh, A. Bleeke, M. S.
Chapter: 25 (Page no: 481) Amino acid analysis of plant products. Author(s): Rutherfurd, S. M.
Chapter: 26 (Page no: 497) Metabolic amino acid availability in foods of plant origin: implications for human and livestock nutrition. Author(s): Levesque, C. L.
Chapter: 27 (Page no: 507) Toxicology of non-protein amino acids. Author(s): D'Mello, J. P. F.
Chapter: 28 (Page no: 538) Delivering innovative solutions and paradigms for a changing environment. Author(s): D'Mello, J. P. F.

Chapter details

  • Author Affiliation
  • USDA Agricultural Research Service, Geneva, New York, USA.
  • Year of Publication
  • 2015
  • ISBN
  • 9781780642635
  • Record Number
  • 20153121419