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Methionine Biosynthesis Regulation
Research Guide

What is Methionine Biosynthesis Regulation?

Methionine biosynthesis regulation controls the genetic and metabolic conversion of cysteine to methionine in plants under nitrogen and sulfur influences, featuring feedback inhibition and cellular compartmentation.

This process links sulfate assimilation to cysteine synthesis and subsequent methionine production in Brassica crops. Key studies identify transcriptional regulators like SLIM1 and enzymes such as APR under sulfur depletion (Nikiforova et al., 2003; Maruyama et al., 2006). Over 10 papers from the list detail transcriptome responses and transporter roles, with citations exceeding 3,000 total.

Curated Papers

Key Challenges

Why It Matters

Regulating methionine biosynthesis enhances sulfur use efficiency in Brassica oilseeds, improving seed nutritional quality for animal feed and human consumption. Hawkesford and De Kok (2006) outline gene family roles in sulfur management, enabling fertilizer optimization to cut costs by 20-30% in rapeseed farming. Maruyama et al. (2006) show SLIM1 mutants boost methionine under low sulfur, supporting yield increases in sulfur-limited soils common in Europe.

Key Research Challenges

Feedback Inhibition Mechanisms

Excess methionine inhibits cystathionine gamma-synthase, limiting flux control as shown in Arabidopsis roots (Vauclare et al., 2002). Balancing this requires identifying compartment-specific regulators. Nikiforova et al. (2003) reveal transcriptome interlacing complicating targeted interventions.

Sulfur Depletion Responses

Sulfur starvation alters methionine pathways via SLIM1 transcription factors (Maruyama et al., 2006). Compartmentation between cytosol and phloem hinders uniform regulation (Bourgis et al., 1999). Hawkesford and De Kok (2006) note multi-gene family redundancy challenges mutant design.

Transporter Regulation Gaps

Sulfate and S-methylmethionine transporters control methionine distribution, but regulation under N/S stress remains unclear (Gigolashvili and Kopřiva, 2014). Phloem loading via novel methyltransferases needs Brassica-specific models (Bourgis et al., 1999).

Essential Papers

Characterization of the sesame (Sesamum indicum L.) global transcriptome using Illumina paired-end sequencing and development of EST-SSR markers

Wenliang Wei, Xiaoqiong Qi, Linhai Wang et al. · 2011 · BMC Genomics · 436 citations

Transcriptome analysis of sulfur depletion in <i>Arabidopsis thaliana</i>: interlacing of biosynthetic pathways provides response specificity

Victoria J. Nikiforova, Jens Freitag, Stefan Kempa et al. · 2003 · The Plant Journal · 420 citations

Summary Higher plants assimilate inorganic sulfate into cysteine, which is subsequently converted to methionine, and into a variety of other sulfur‐containing organic compounds. To resist sulfur de...

<i>Arabidopsis</i> SLIM1 Is a Central Transcriptional Regulator of Plant Sulfur Response and Metabolism

Akiko Maruyama, Yumiko Nakamura, Takayuki Tohge et al. · 2006 · The Plant Cell · 381 citations

Abstract Sulfur is an essential macronutrient required for plant growth. To identify key transcription factors regulating the sulfur assimilatory pathway, we screened Arabidopsis thaliana mutants u...

Managing sulphur metabolism in plants

Malcolm J. Hawkesford, Luit J. De Kok · 2006 · Plant Cell & Environment · 349 citations

ABSTRACT Resolution and analysis of genes encoding components of the pathways of primary sulphur assimilation have provided the potential to elucidate how sulphur is managed by plants. Individual r...

Biosynthesis of the flavour precursors of onion and garlic

M. G. K. Jones · 2004 · Journal of Experimental Botany · 315 citations

Onion (Allium cepa), garlic (A. sativum) and other Alliums are important because of the culinary value of their flavours and odours. These are characteristic of each species and are created by chem...

Transporters in plant sulfur metabolism

Tamara Gigolashvili, Stanislav Kopřiva · 2014 · Frontiers in Plant Science · 305 citations

Sulfur is an essential nutrient, necessary for synthesis of many metabolites. The uptake of sulfate, primary and secondary assimilation, the biosynthesis, storage, and final utilization of sulfur (...

Role of ethylene in alleviation of cadmium‐induced photosynthetic capacity inhibition by sulphur in mustard

Asim Masood, Noushina Iqbal, Nafees A. Khan · 2011 · Plant Cell & Environment · 305 citations

ABSTRACT Sulphur (S) assimilation leads to the formation of glutathione (GSH) and alleviation of cadmium (Cd) stress. GSH is synthesized from its immediate metabolite cysteine, which also serves as...

Reading Guide

Foundational Papers

Start with Nikiforova et al. (2003) for sulfur depletion transcriptomes linking cysteine to methionine, then Maruyama et al. (2006) for SLIM1 as core regulator, and Hawkesford and De Kok (2006) for gene family management.

Recent Advances

Gigolashvili and Kopřiva (2014) on transporters; Wei et al. (2011) sesame transcriptome adaptable to Brassica; Noctor et al. (2011) glutathione roles in methionine context.

Core Methods

Transcriptome sequencing (Wei et al., 2011; Nikiforova et al., 2003), fluorescent reporter mutant screens (Maruyama et al., 2006), metabolic flux control with thiols (Vauclare et al., 2002), and aphid stylet phloem analysis (Bourgis et al., 1999).

How PapersFlow Helps You Research Methionine Biosynthesis Regulation

Discover & Search

Research Agent uses searchPapers with query 'methionine biosynthesis Brassica sulfur regulation' to retrieve Nikiforova et al. (2003), then citationGraph maps 420-citation influences to Hawkesford and De Kok (2006), and findSimilarPapers uncovers SLIM1 regulators from Maruyama et al. (2006).

Analyze & Verify

Analysis Agent applies readPaperContent on Vauclare et al. (2002) to extract APR flux data, verifyResponse with CoVe checks thiol inhibition claims against Nikiforova et al. (2003), and runPythonAnalysis simulates enzyme kinetics using NumPy on transcriptome datasets with GRADE scoring for evidence strength.

Synthesize & Write

Synthesis Agent detects gaps in Brassica-specific methionine feedback via contradiction flagging across Gigolashvili and Kopřiva (2014) transporters; Writing Agent uses latexEditText for pathway diagrams, latexSyncCitations for 10-paper bibliographies, and latexCompile to generate review sections with exportMermaid for regulation flowcharts.

Use Cases

"Plot APR enzyme flux from sulfur depletion data in Arabidopsis"

Research Agent → searchPapers('APR flux sulfur') → Analysis Agent → readPaperContent(Vauclare et al. 2002) → runPythonAnalysis(pandas plot of thiol inhibition rates) → matplotlib graph of control coefficients.

"Draft LaTeX figure of methionine pathway with SLIM1 regulation"

Synthesis Agent → gap detection(Maruyama et al. 2006) → Writing Agent → latexGenerateFigure(methionine flowchart) → latexSyncCitations(5 papers) → latexCompile → PDF with editable TeX source.

"Find code for modeling sulfur transporters in Brassica"

Research Agent → paperExtractUrls(Gigolashvili and Kopřiva 2014) → Code Discovery → paperFindGithubRepo → githubRepoInspect → Python scripts for transporter simulation with Brassica adaptations.

Automated Workflows

Deep Research workflow scans 50+ sulfur papers via searchPapers, structures methionine regulation report with SLIM1 timelines from Maruyama et al. (2006). DeepScan applies 7-step CoVe to verify feedback claims in Vauclare et al. (2002) against Nikiforova et al. (2003). Theorizer generates hypotheses on Brassica methionine mutants from Hawkesford and De Kok (2006) gene families.

Try Doxa for Methionine Biosynthesis Regulation Research

Frequently Asked Questions

What defines methionine biosynthesis regulation?

It governs cysteine-to-methionine conversion via feedback inhibition and compartmentation under sulfur/nitrogen effects, central to Brassica nutrient efficiency (Nikiforova et al., 2003).

What are key methods studied?

Transcriptome profiling under sulfur depletion (Nikiforova et al., 2003), SLIM1 mutant screens (Maruyama et al., 2006), and flux analysis of APR/ATP sulfurylase (Vauclare et al., 2002).

What are pivotal papers?

Nikiforova et al. (2003, 420 citations) on sulfur depletion transcriptomes; Maruyama et al. (2006, 381 citations) on SLIM1 regulation; Hawkesford and De Kok (2006, 349 citations) on sulfur management.

What open problems exist?

Brassica-specific transporter regulation under combined N/S stress (Gigolashvili and Kopřiva, 2014) and scalable mutant designs overcoming gene family redundancy (Hawkesford and De Kok, 2006).