Subtopic Deep Dive
Glutathione S-Transferase Enzyme Structure
Research Guide
What is Glutathione S-Transferase Enzyme Structure?
Glutathione S-Transferase (GST) enzyme structure encompasses the crystallographic determination, active site architecture, and conformational dynamics of GST isoforms across species using X-ray crystallography and computational modeling.
GSTs form a superfamily of dimeric enzymes with conserved glutathione-binding sites (G-site) and hydrophobic substrate-binding sites (H-site). Sheehan et al. (2001) classify GST structures into alpha, mu, pi, theta, sigma, zeta, and omega classes based on sequence and fold conservation (1522 citations). Board et al. (2000) report the first crystal structure of the omega class GST, revealing a unique active site cysteine (716 citations).
Why It Matters
Structural knowledge of GST isoforms guides design of selective inhibitors targeting drug-metabolizing enzymes in cancer chemotherapy resistance. Sheehan et al. (2001) link GST structural diversity to detoxification roles in toxicology and agriculture. Board et al. (2000) show omega GST structures explain selenocysteine conjugation functions relevant to oxidative stress diseases. Ali-Osman et al. (1997) correlate pi isoform variants with altered active sites influencing glioma therapy responses (720 citations).
Key Research Challenges
Isoform-specific Active Site Variability
GST classes exhibit distinct H-site topologies despite conserved G-sites, complicating inhibitor selectivity. Sheehan et al. (2001) highlight evolutionary divergences in non-mammalian GST folds (1522 citations). Board et al. (2000) describe omega class cysteine residues altering substrate specificity (716 citations).
Conformational Dynamics in Catalysis
Open-closed transitions during substrate binding remain unresolved by static crystallography. Sheehan et al. (2001) note domain movements essential for catalysis across classes. Computational modeling gaps persist for dynamic simulations.
Non-mammalian Structure Classification
Evolutionary classification lacks structures for plant and invertebrate GSTs. Dixon et al. (2002) identify phi and tau classes in plants without full crystallographic data (816 citations). Sheehan et al. (2001) propose superfamily implications needing validation.
Essential Papers
Keap1 represses nuclear activation of antioxidant responsive elements by Nrf2 through binding to the amino-terminal Neh2 domain
Ken Itoh, Nobunao Wakabayashi, Yasutake Katoh et al. · 1999 · Genes & Development · 3.5K citations
Transcription factor Nrf2 is essential for the antioxidant responsive element (ARE)-mediated induction of phase II detoxifying and oxidative stress enzyme genes. Detailed analysis of differential N...
Structure, function and evolution of glutathione transferases: implications for classification of non-mammalian members of an ancient enzyme superfamily
David Sheehan, Gerardene MEADE, Vivienne Foley et al. · 2001 · Biochemical Journal · 1.5K citations
The glutathione transferases (GSTs; also known as glutathione S-transferases) are major phase II detoxification enzymes found mainly in the cytosol. In addition to their role in catalysing the conj...
Regulation of JNK signaling by GSTp
Victor Adler · 1999 · The EMBO Journal · 1.1K citations
Glutathione dysregulation and the etiology and progression of human diseases
Nazzareno Ballatori, Suzanne M. Krance, Sylvia Notenboom et al. · 2009 · Biological Chemistry · 1.1K citations
Abstract Glutathione (GSH) plays an important role in a multitude of cellular processes, including cell differentiation, proliferation, and apoptosis, and as a result, disturbances in GSH homeostas...
Dysfunctional KEAP1–NRF2 Interaction in Non-Small-Cell Lung Cancer
Anju Singh, Vikas Misra, Rajesh K. Thimmulappa et al. · 2006 · PLoS Medicine · 1.0K citations
This is the first study to our knowledge to demonstrate that biallelic inactivation of KEAP1 is a frequent genetic alteration in NSCLC. Loss of KEAP1 function leading to constitutive activation of ...
Oxidative stress and regulation of glutathione in lung inflammation
Irfan Rahman, William MacNee · 2000 · European Respiratory Journal · 907 citations
Inflammatory lung diseases are characterized by chronic inflammation and oxidant/antioxidant imbalance, a major cause of cell damage. The development of an oxidant/antioxidant imbalance in lung inf...
Plant glutathione transferases.
David P. Dixon, Adrian J. Lapthorn, Robert Edwards · 2002 · Genome Biology · 816 citations
The soluble glutathione transferases (GSTs, EC 2.5.1.18) are encoded by a large and diverse gene family in plants, which can be divided on the basis of sequence identity into the phi, tau, theta, z...
Reading Guide
Foundational Papers
Start with Sheehan et al. (2001, 1522 citations) for superfamily classification and fold conservation; follow with Board et al. (2000, 716 citations) for inaugural omega class structure establishing cysteine active site precedents.
Recent Advances
Prioritize Ali-Osman et al. (1997, 720 citations) for human pi variants with structural implications; Dixon et al. (2002, 816 citations) for plant GST classes.
Core Methods
X-ray crystallography for static structures (Board et al., 2000); sequence alignment and homology modeling for isoform comparisons (Sheehan et al., 2001).
How PapersFlow Helps You Research Glutathione S-Transferase Enzyme Structure
Discover & Search
Research Agent uses searchPapers with query 'GST omega class crystal structure' to retrieve Board et al. (2000), then citationGraph reveals 716 citing papers on isoform structures, and findSimilarPapers surfaces Sheehan et al. (2001) for superfamily classification.
Analyze & Verify
Analysis Agent applies readPaperContent on Board et al. (2000) to extract active site coordinates, verifies structural claims via verifyResponse (CoVe) against PDB databases, and runs PythonAnalysis for sequence alignments of GST classes with GRADE scoring for evolutionary conservation evidence.
Synthesize & Write
Synthesis Agent detects gaps in omega GST dynamics coverage across papers, flags contradictions in H-site classifications, while Writing Agent uses latexEditText and latexSyncCitations to draft structural reviews with Board et al. (2000), and latexCompile generates compilable manuscripts with exportMermaid diagrams of GST folds.
Use Cases
"Align sequences of GST pi variants from Ali-Osman 1997 and compute active site differences"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (Biopython alignment + matplotlib residue plots) → researcher gets CSV of variant mutations and structural impact scores.
"Generate LaTeX figure of GST omega active site from Board 2000 crystal structure"
Analysis Agent → readPaperContent → Synthesis Agent → latexGenerateFigure + latexCompile → researcher gets PDF with annotated PDB-derived diagram synced to citations.
"Find GitHub repos with GST structure modeling code linked to Sheehan 2001"
Research Agent → citationGraph on Sheehan et al. (2001) → Code Discovery (paperExtractUrls → paperFindGithubRepo → githubRepoInspect) → researcher gets vetted repos with molecular dynamics scripts for GST simulations.
Automated Workflows
Deep Research workflow scans 50+ GST structure papers via searchPapers chains, producing structured reports with GRADE-verified isoform classifications from Sheehan et al. (2001). DeepScan applies 7-step analysis with CoVe checkpoints to Board et al. (2000), outputting verified active site metrics. Theorizer generates hypotheses on pi variant dynamics from Ali-Osman et al. (1997) literature synthesis.
Frequently Asked Questions
What defines GST enzyme structure?
GST structures feature a thioredoxin-like fold with G-site for glutathione and variable H-site for substrates, as classified by Sheehan et al. (2001).
What methods determine GST structures?
X-ray crystallography reveals atomic details, as in Board et al. (2000) omega class structure at high resolution; computational modeling supplements for dynamics.
What are key papers on GST structures?
Sheehan et al. (2001, 1522 citations) reviews superfamily structures; Board et al. (2000, 716 citations) provides omega class crystal structure.
What open problems exist in GST structures?
Resolving conformational dynamics and non-mammalian class structures like plant phi/tau GSTs lack full crystallography, per Dixon et al. (2002).
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