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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Coordinating Sulfur Pools under Sulfate Deprivation.

Fayezeh Aarabi1, Thomas Naake1, Alisdair R Fernie1

  • 1Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.

Trends in Plant Science
|August 18, 2020
PubMed
Summary
This summary is machine-generated.

Plants alter sulfur metabolism under deficiency. O-Acetylserine (OAS) levels change, impacting regulators like Sulfur Deficiency Induced (SDI) genes, which control glucosinolate (GSL) levels. Understanding OAS signaling is key.

Keywords:
SDIglucosinolatesulfate deficiency

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Area of Science:

  • Plant Physiology
  • Plant Metabolism
  • Molecular Biology

Background:

  • Plants exhibit significant metabolic adjustments during sulfate deficiency, affecting all sulfur-containing compounds.
  • O-Acetylserine (OAS) levels are rapidly altered by sulfate deficiency and are linked to key regulators of plant sulfur metabolism.
  • Regulators such as Sulfur Deficiency Induced (SDI1, SDI2), More Sulfur Accumulation1 (MSA1), and GGCT2;1 play crucial roles in maintaining plant sulfur homeostasis.

Purpose of the Study:

  • To investigate the mechanisms of O-Acetylserine (OAS) perception and signaling in plants under sulfate deficiency.
  • To focus on general OAS-responsive genes and the specific roles of SDI1 and SDI2 in regulating glucosinolate (GSL) levels.
  • To identify and address key open questions regarding sulfur partitioning in plants.

Main Methods:

  • Analysis of OAS-responsive genes under sulfate-limited conditions.
  • Detailed examination of the function of SDI1 and SDI2 genes.
  • Investigation of sulfur partitioning mechanisms.

Main Results:

  • Identified general OAS-responsive genes.
  • Elucidated the specific roles of SDI1 and SDI2 in downregulating glucosinolate (GSL) pool size.
  • Highlighted critical areas of uncertainty in plant sulfur partitioning.

Conclusions:

  • O-Acetylserine (OAS) is a critical signaling molecule in plant responses to sulfate deficiency.
  • SDI1 and SDI2 are key regulators that modulate glucosinolate (GSL) biosynthesis under sulfur stress.
  • Further research is needed to fully understand the complexities of sulfur partitioning in plants.