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Sulfate resupply accentuates protein synthesis in coordination with nitrogen metabolism in sulfur deprived Brassica napus

Abstract : To investigate the regulatory interactions between S assimilation and N metabolism in Brassica napus, de nova synthesis of amino acids and proteins was quantified by N-15 and S-34 tracing, and the responses of transporter genes, assimilatory enzymes and metabolites pool involving in nitrate and sulfate metabolism were assessed under continuous sulfur supply, sulfur deprivation and sulfate resupply after 3 days of sulfur (S) deprivation. S-deprived plants were characterized by a strong induction of sulfate transporter genes, ATP sulfurylase (ATPS) and adenosine 5'-phosphosulfate reductase (APR), and by a repressed activity of nitrate reductase (NR) and glutamine synthetase (GS). Sulfate resupply to the 5deprived plants strongly increased cysteine, amino acids and proteins concentration. The increase in sulfate and cysteine concentration caused by sulfate resupply was not matched with the expression of sulfate transporters and the activity of ATPS and APR which were rapidly decreased by sulfate resupply. A strong induction of O-acetylserine(thiol)Iyase (OASTL), NR and GS upon sulfate resupply was accompanied with the increase in cysteine, amino acids and proteins pool. Sulfate resupply resulted in a strong increase in de novo synthesis of amino acids and proteins, as evidenced by the increases in N and S incorporation into amino acids (1.8-and 2.4-fold increase) and proteins (2.2-and 6.3-fold increase) when compared to S-deprived plants. The results thus indicate that sulfate resupply followed by S-deprivation accelerates nitrate assimilation for protein synthesis.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02183529
Contributor : Sophie Delle Cave <>
Submitted on : Monday, July 15, 2019 - 1:50:22 PM
Last modification on : Wednesday, May 27, 2020 - 9:00:50 AM

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Qian Zhang, Bok-Rye Lee, Sang-Hyun Park, Rashed Zaman, Jean-Christophe Avice, et al.. Sulfate resupply accentuates protein synthesis in coordination with nitrogen metabolism in sulfur deprived Brassica napus. Plant Physiology and Biochemistry, Elsevier, 2015, 87, pp.1-8. ⟨10.1016/j.plaphy.2014.12.006⟩. ⟨hal-02183529⟩

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