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High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications
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Exploiting CELLULOSE SYNTHASE (CESA) Class Specificity to Probe Cellulose Microfibril Biosynthesis.

Manoj Kumar1, Laxmi Mishra1, Paul Carr1

  • 1University of Manchester, Faculty of Biology, Medicine, and Health, Manchester M13 9PT, United Kingdom.

Plant Physiology
|March 11, 2018
PubMed
Summary
This summary is machine-generated.

Mutant CELLULOSE SYNTHASE A (CESA) proteins in Arabidopsis plants reveal that different CESA classes influence cellulose microfibril structure. Catalytic activity, not just protein class, affects cellulose synthesis and cell wall composition.

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Cellulose microfibrils form the structural basis of plant cell walls.
  • The cellulose synthase complex (CSC), composed of CELLULOSE SYNTHASE A (CESA) proteins, synthesizes these microfibrils.
  • Three CESA classes (CESA4, CESA7, CESA8) are crucial for secondary cell wall cellulose biosynthesis.

Purpose of the Study:

  • To investigate the relationship between CESA protein structure/function and cellulose microfibril architecture.
  • To determine how catalytically inactive CESA mutants affect cellulose synthesis and microfibril properties.
  • To understand the distinct roles of CESA classes in plant cell wall formation.

Main Methods:

  • Creation of catalytically inactive CESA mutants in Arabidopsis thaliana.
  • Genetic complementation assays using cesa null mutants.
  • Biophysical analyses including solid-state nuclear magnetic resonance (ssNMR) and Fourier transform infrared microscopy (FTIR).

Main Results:

  • Catalytically inactive CESA mutants showed varying degrees of complementation in cellulose-deficient plants.
  • CESA4 mutants provided better complementation than CESA8 mutants.
  • Observed changes in cellulose microfibril structure correlated with overall cellulose content and primary/secondary cell wall ratios.

Conclusions:

  • Individual CESA classes play similar roles in dictating cellulose microfibril structure.
  • Differences in mutant CESA effects are likely due to variations in catalytic activity and impact on cellulose synthesis rates.
  • CESA catalytic activity is a key factor influencing cellulose microfibril assembly and plant cell wall composition.