Subtopic Deep Dive
Expansins in Cell Wall Loosening
Research Guide
What is Expansins in Cell Wall Loosening?
Expansins are non-enzymatic proteins that induce plant cell wall loosening by disrupting non-covalent bonds between polysaccharides, enabling turgor-driven cell expansion.
Expansins belong to a superfamily classified into α- and β-expansins, with gene families identified across plant species (Sampedro and Cosgrove, 2005, 693 citations). They cause wall creep in biochemical assays without hydrolyzing polysaccharides (Cosgrove, 2015, 554 citations). Research spans gene expression, growth phenotypes, and stress responses, with over 20 key papers in the expansin field.
Why It Matters
Expansins control cell elongation critical for plant growth, linking auxin signaling to expansion phenotypes (Perrot-Rechenmann, 2010, 580 citations). Manipulating expansin expression targets crop yield under abiotic stress like drought, where cell wall remodeling maintains root growth (Tenhaken, 2015, 718 citations; Le Gall et al., 2015, 1217 citations). Engineering expansins enhances biomass for biofuels by improving cell wall accessibility (Arantes and Saddler, 2010, 600 citations).
Key Research Challenges
Expansin biochemical mechanism
Expansins induce wall extension without enzymatic activity, but binding targets remain unclear (Cosgrove, 2015, 554 citations). Assays show creep on cellulose but not isolated microfibrils (Sampedro and Cosgrove, 2005, 693 citations). Structural studies lag due to low stability.
Gene family functional redundancy
Plants express 30+ expansin genes with overlapping roles in growth and stress (Sampedro and Cosgrove, 2005, 693 citations). Knockouts yield mild phenotypes, complicating assignment (Fagard et al., 2000, 559 citations). Tissue-specific expression requires advanced profiling.
Stress-induced regulation
Expansins respond to abiotic stresses, but upstream signals differ by condition (Le Gall et al., 2015, 1217 citations). Integrating hormonal and mechanical cues challenges models (Perrot-Rechenmann, 2010, 580 citations). Quantitative dynamics need modeling.
Essential Papers
Cell Wall Metabolism in Response to Abiotic Stress
Hyacinthe Le Gall, Florian Philippe, Jean-Marc Domon et al. · 2015 · Plants · 1.2K citations
This review focuses on the responses of the plant cell wall to several abiotic stresses including drought, flooding, heat, cold, salt, heavy metals, light, and air pollutants. The effects of stress...
Novel enzymes for the degradation of cellulose
Svein Jarle Horn, Gustav Vaaje‐Kolstad, Bjørge Westereng et al. · 2012 · Biotechnology for Biofuels · 1.0K citations
Plant Cell Wall–Degrading Enzymes and Their Secretion in Plant-Pathogenic Fungi
Christian P. Kubicek, Trevor L. Starr, N. Louise Glass · 2014 · Annual Review of Phytopathology · 880 citations
Approximately a tenth of all described fungal species can cause diseases in plants. A common feature of this process is the necessity to pass through the plant cell wall, an important barrier again...
Cell wall remodeling under abiotic stress
Raimund Tenhaken · 2015 · Frontiers in Plant Science · 718 citations
Plants exposed to abiotic stress respond to unfavorable conditions on multiple levels. One challenge under drought stress is to reduce shoot growth while maintaining root growth, a process requirin...
The expansin superfamily.
Javier Sampedro, Daniel J. Cosgrove · 2005 · Genome Biology · 693 citations
Access to cellulose limits the efficiency of enzymatic hydrolysis: the role of amorphogenesis
Valdeir Arantes, J. N. Saddler · 2010 · Biotechnology for Biofuels · 600 citations
Cellular Responses to Auxin: Division versus Expansion
Catherine Perrot‐Rechenmann · 2010 · Cold Spring Harbor Perspectives in Biology · 580 citations
The phytohormone auxin is a major regulator of plant growth and development. Many aspects of these processes depend on the multiple controls exerted by auxin on cell division and cell expansion. Th...
Reading Guide
Foundational Papers
Start with Sampedro and Cosgrove (2005, 693 citations) for superfamily classification, then Cosgrove (2015, 554 citations) for mechanics and assays to ground mechanisms.
Recent Advances
Le Gall et al. (2015, 1217 citations) covers stress responses; Tenhaken (2015, 718 citations) details remodeling under drought.
Core Methods
Creep assays on isolated walls (Cosgrove, 2015); gene knockouts like PROCUSTE1 for phenotypes (Fagard et al., 2000); auxin response profiling (Perrot-Rechenmann, 2010).
How PapersFlow Helps You Research Expansins in Cell Wall Loosening
Discover & Search
Research Agent uses searchPapers('expansin cell wall loosening') to retrieve Sampedro and Cosgrove (2005, 693 citations), then citationGraph reveals 500+ citing papers on superfamily evolution, and findSimilarPapers expands to stress-responsive expansins.
Analyze & Verify
Analysis Agent applies readPaperContent on Cosgrove (2015) to extract creep assay data, verifyResponse with CoVe checks claims against Le Gall et al. (2015), and runPythonAnalysis plots gene expression correlations from supplementary tables using pandas, with GRADE scoring methodological rigor.
Synthesize & Write
Synthesis Agent detects gaps in expansin-auxin integration from Perrot-Rechenmann (2010), flags contradictions in stress roles, then Writing Agent uses latexEditText for models, latexSyncCitations across 20 papers, and latexCompile for a review manuscript with exportMermaid diagrams of superfamily phylogeny.
Use Cases
"Analyze expansin gene expression data from drought stress papers"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas heatmap of RNA-seq from Le Gall et al. 2015 supplements) → matplotlib fold-change plots exported as figure.
"Draft LaTeX review on expansin superfamily evolution"
Synthesis Agent → gap detection → Writing Agent → latexEditText (intro section) → latexSyncCitations (Sampedro 2005 et al.) → latexCompile → PDF with phylogeny Mermaid diagram.
"Find code for expansin wall creep simulations"
Research Agent → paperExtractUrls (Cosgrove 2015) → Code Discovery → paperFindGithubRepo → githubRepoInspect → finite element model scripts for wall mechanics.
Automated Workflows
Deep Research workflow scans 50+ expansin papers via searchPapers → citationGraph → structured report on gene families with GRADE evidence tables. DeepScan applies 7-step CoVe to verify Cosgrove (2015) creep data against biochemical assays. Theorizer generates hypotheses linking expansins to cellulose synthase mutants like PROCUSTE1 (Fagard et al., 2000).
Frequently Asked Questions
What defines expansins?
Expansins are non-enzymatic proteins disrupting non-covalent polysaccharide bonds to loosen cell walls (Sampedro and Cosgrove, 2005).
What methods study expansin activity?
Creep assays measure wall extension on cellulose substrates; expression profiling tracks genes in growth zones (Cosgrove, 2015).
What are key expansin papers?
Sampedro and Cosgrove (2005, 693 citations) classify the superfamily; Cosgrove (2015, 554 citations) links mechanics to growth.
What open problems exist?
Exact binding targets and in vivo quantification during stress remain unresolved (Le Gall et al., 2015; Tenhaken, 2015).
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