geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Nitrate activation of cytosolic protein kinases diverts photosynthetic carbon from sucrose to amino Acid biosynthesis: basis for a new concept


, : Nitrate activation of cytosolic protein kinases diverts photosynthetic carbon from sucrose to amino Acid biosynthesis: basis for a new concept. Plant Physiology 100(1): 7-12

The regulation of carbon partitioning between carbohydrates (principally sucrose) and amino acids has been only poorly characterized in higher plants. The hypothesis that the pathway of sucrose and amino acid biosynthesis compete for carbon skeletons and energy is widely accepted. In this review, we suggest a mechanism involving the regulation of cytosolic protein kinases whereby the flow of carbon is regulated at the level of partitioning between the pathways of carbohydrate and nitrogen metabolism via the covalent modulation of component enzymes. The addition of nitrate to wheat seedlings (Triticum aestivum) grown in the absence of exogenous nitrogen has a dramatic, if transient, impact on sucrose formation and on the activities of sucrose phosphate synthase (which is inactivated) and phosphoenolpyruvate carboxylase (which is activated). The activities of these two enzymes are modulated by protein phosphorylation in response to the addition of nitrate, but they respond in an inverse fashion. Sucrose phosphate synthase is inactivated and phosphoenolpyruvate carboxylase is activated. Nitrate functions as a signal metabolite activating the cytosolic protein kinase, thereby modulating the activities of at least two of the key enzymes in assimilate partitioning and redirecting the flow of carbon away from sucrose biosynthesis toward amino acid synthesis.

US$19.90

PMID: 16653003

DOI: 10.1104/pp.100.1.7


Other references

Parent, B., 1969: Influence of climatic factors on the arthropods injurious to cultivated plants. The author reviews work on the influence of climatic factors on arthropod pests, including those of apple orchards, vegetables and forest trees. He concludes that much the most important factor is temperature, which determines the area of distribu...

Yang, Z.; Liang, Y.; Xi, W.; Li, C.; Zhong, R., 2011: Association of increased serum IL-33 levels with clinical and laboratory characteristics of systemic lupus erythematosus in Chinese population. Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by abnormal production of autoantibodies and proinflammatory cytokines. Although interleukin-33 (IL-33), a novel number of the IL-1 family, has been reported to have proinfl...

Galiano, M.E., 1963: Las especies americanas de aranas de la familia Salticidae, descriptas por Eugene Simon. Redescripciones basadas en los ejemplares tipicos. Physis Buenos Aires, 23: 273-470

Gonatas, J.O.; Mourelatos, Z.; Gonatas, N.J.; Lane, W.S.; J.Brosius, 1994: Primary structure of MG-160, a membrane sialoglycoprotein of the Golgi apparatus. Molecular Biology of the Cell 5(SUPPL ): 440A

Lemaitre, G.; Houix, O.; Voisin, Fédéric.; Misdariis, N.; Susini, P., 2017: Vocal Imitations of Non-Vocal Sounds. Imitative behaviors are widespread in humans, in particular whenever two persons communicate and interact. Several tokens of spoken languages (onomatopoeias, ideophones, and phonesthemes) also display different degrees of iconicity between the sou...

Cohen, D.M.; Black, S.B.; Schoen, E.J., 1994: Hepatitis B Compliance with prenatal screening and infant immunization programs. Pediatric Research 35(4 PART 2): 111A

Gilmore, J.P.; Nizolek J.N.zolek JA.J.; Jacob, R.J., 1971: Further characterization of myocardial K+ loss induced by changing contraction frequency. American Journal of Physiology 221(2): 465-469

Stone, A., 2014: How to ... give written feedback. Education for Primary Care 24(6): 473-475

Grimm, R., 1982: Die Entwicklung des Elbe-Lebensraumes in den letzten zwanzig Jahren aus okologischer Sicht. Seevoegel, 31: 65-69

Hider R.C.; Drake A.F.; Morrison I.E.G.; Kupryszewski G.; Wilusz T., 1987: Structure analysis of trypsin inhibitors isolated from cucurbitaceae seeds circular dichroism studies. Structure analysis jointly based on circular dichroism and Chou and Fasman analysis has been performed on a homologous group of 12 squash proteinase inhibitors. The analysis favours a structure incorporating 40-45% helix which is tightly crosslink...