Subtopic Deep Dive
Glutathione S-Transferases in Plants
Research Guide
What is Glutathione S-Transferases in Plants?
Glutathione S-Transferases (GSTs) in plants are multifunctional enzymes from a large gene family that catalyze glutathione conjugation for xenobiotic detoxification, herbicide metabolism, and stress responses.
Plant GSTs include phi (GSTF) and tau (GSTU) classes unique to plants, with roles in oxidative stress metabolism and secondary metabolism (Marrs, 1996; 1400 citations). Studies identify over 50 isoforms in crops like wheat and sorghum, showing functional divergence across species (Liu et al., 2012; 164 citations; Chi et al., 2010; 95 citations). Approximately 20 key papers detail their regulation and structure from 1996-2020.
Why It Matters
GSTs detoxify herbicides in crops like wheat, enabling resistance to agrochemicals and improving yield under stress (Thom et al., 2002; 174 citations). They mitigate oxidative damage from abiotic stresses, supporting engineering of stress-tolerant varieties in sorghum and Arabidopsis (Smith et al., 2004; 103 citations; Chi et al., 2010). Marrs (1996) review links GST regulation to resilient agriculture, reducing crop losses from xenobiotics.
Key Research Challenges
Isoform Functional Divergence
Distinguishing substrate specificities among 50+ GST isoforms requires proteomic analysis, as seen in Physcomitrella patens (Liu et al., 2012; 164 citations). Evolutionary patterns complicate ortholog identification across species (Chi et al., 2010; 95 citations). Functional assays reveal tau class roles in herbicide detox but vary by plant.
Regulatory Network Mapping
Transcriptional regulation under stress remains unclear despite known roles in xenobiotic response (Marrs, 1996; 1400 citations). Copper-treated Arabidopsis seedlings show GST induction, but network interactions need genomics (Smith et al., 2004; 103 citations). Theta and tau class differences hinder unified models (Droog, 1997; 140 citations).
Herbicide Detox Structure
Crystal structures of tau GSTs from wheat aid herbicide binding models but limit broader applications (Thom et al., 2002; 174 citations). Substrate versatility challenges prediction in crops (Vaish et al., 2020; 194 citations). Engineering specific isoforms for tolerance demands high-resolution data.
Essential Papers
THE FUNCTIONS AND REGULATION OF GLUTATHIONE S-TRANSFERASES IN PLANTS
Kathleen A. Marrs · 1996 · Annual Review of Plant Physiology and Plant Molecular Biology · 1.4K citations
▪ Abstract Glutathione S-transferases (GSTs) play roles in both normal cellular metabolism as well as in the detoxification of a wide variety of xenobiotic compounds, and they have been intensively...
Glutathione S-transferase: a versatile protein family
Swati Vaish, Divya Gupta, Rajesh Mehrotra et al. · 2020 · 3 Biotech · 194 citations
Structure of a Tau Class Glutathione <i>S-</i>Transferase from Wheat Active in Herbicide Detoxification<sup>,</sup>
Russell Thom, Ian Cummins, David P. Dixon et al. · 2002 · Biochemistry · 174 citations
Glutathione S-transferases (GSTs) from the phi (GSTF) and tau (GSTU) classes are unique to plants and play important roles in stress tolerance and secondary metabolism as well as catalyzing the det...
Functional Divergence of the Glutathione <i>S</i>-Transferase Supergene Family in <i>Physcomitrella patens</i> Reveals Complex Patterns of Large Gene Family Evolution in Land Plants
Yan‐Jing Liu, Xue‐Min Han, Lin-Ling Ren et al. · 2012 · PLANT PHYSIOLOGY · 164 citations
Abstract Plant glutathione S-transferases (GSTs) are multifunctional proteins encoded by a large gene family that play major roles in the detoxification of xenobiotics and oxidative stress metaboli...
Plant Glutathione S-Transferases, a Tale of Theta and Tau
F. N. J. Droog · 1997 · Journal of Plant Growth Regulation · 140 citations
“Plant Glutathione S-transferases: An overview”
Ingrid Hernández Estévez, Meilyn Rodríguez Hernández · 2020 · Plant Gene · 120 citations
<i>Hovenia dulcis</i>– An Asian Traditional Herb
Tae Kyung Hyun, Seung Hee Eom, Chang Min Yu et al. · 2010 · Planta Medica · 107 citations
Hovenia dulcis Thunb., known as Japanese raisin tree, is commonly found in East Asia. It has a long history as a food supplement and traditional medicine in Japan, China and Korea, but is little kn...
Reading Guide
Foundational Papers
Start with Marrs (1996; 1400 citations) for core functions and regulation; follow Thom et al. (2002; 174 citations) for tau structure in herbicide detox; Droog (1997; 140 citations) clarifies theta/tau distinctions.
Recent Advances
Vaish et al. (2020; 194 citations) on versatile family; Hernández Estévez (2020; 120 citations) overview; Chi et al. (2010; 95 citations) on sorghum expansions.
Core Methods
Proteomics for induction (Smith et al., 2004); X-ray crystallography for structures (Thom et al., 2002); genome-wide surveys and phylogenetics for divergence (Liu et al., 2012; Chi et al., 2010).
How PapersFlow Helps You Research Glutathione S-Transferases in Plants
Discover & Search
Research Agent uses searchPapers and citationGraph on Marrs (1996; 1400 citations) to map 50+ GST papers, revealing phi/tau class clusters; exaSearch uncovers sorghum expansions (Chi et al., 2010); findSimilarPapers links wheat tau GST (Thom et al., 2002) to recent isoforms.
Analyze & Verify
Analysis Agent applies readPaperContent to extract GST induction data from Smith et al. (2004), verifies claims with CoVe against proteomics, and runs PythonAnalysis for isoform clustering via pandas on Physcomitrella data (Liu et al., 2012); GRADE scores evidence on herbicide detox strength.
Synthesize & Write
Synthesis Agent detects gaps in tau class regulation post-Marrs (1996), flags contradictions in stress roles; Writing Agent uses latexEditText, latexSyncCitations for GST network diagrams, and latexCompile for manuscripts with exportMermaid flowcharts of phi/tau divergence.
Use Cases
"Analyze GST isoform expression data from Arabidopsis copper stress proteomics."
Analysis Agent → readPaperContent (Smith et al., 2004) → runPythonAnalysis (pandas heatmap of 20+ GSTs) → statistical verification output with p-values and cluster plots.
"Draft a review section on plant GST evolution with citations and figures."
Synthesis Agent → gap detection (Chi et al., 2010) → Writing Agent → latexEditText + latexSyncCitations (Marrs 1996, Liu 2012) + latexCompile → LaTeX PDF with mermaid evolution diagram.
"Find code for modeling GST gene family expansions in sorghum."
Research Agent → paperExtractUrls (Chi et al., 2010) → paperFindGithubRepo → Code Discovery → githubRepoInspect → Python scripts for phylogenetic trees and duplication analysis.
Automated Workflows
Deep Research workflow scans 50+ GST papers via citationGraph from Marrs (1996), generating structured reports on tau/phi classes with GRADE scores. DeepScan applies 7-step CoVe to verify herbicide detox claims in Thom et al. (2002), checkpointing proteomics data. Theorizer builds regulatory models from Droog (1997) and Vaish (2020) for stress engineering hypotheses.
Frequently Asked Questions
What defines plant GSTs?
Plant GSTs are enzymes conjugating glutathione to xenobiotics, with phi and tau classes unique for herbicide detox and stress (Marrs, 1996).
What are key methods for GST study?
Proteomics identifies induced isoforms (Smith et al., 2004); crystallography reveals tau structures (Thom et al., 2002); genomics surveys expansions (Chi et al., 2010).
What are top papers on plant GSTs?
Marrs (1996; 1400 citations) reviews functions; Thom et al. (2002; 174 citations) details wheat tau structure; Vaish et al. (2020; 194 citations) covers versatility.
What open problems exist in plant GST research?
Regulatory networks under stress need mapping; isoform-specific engineering for crops lacks data; evolutionary divergence predicts poor across species (Liu et al., 2012).
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