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Making parallel lines meet: transferring information from microtubules to extracellular matrix
1Biology Department, University of Massachusetts; Amherst, MA, USA. baskin@bio.umass.edu
Cell Adhesion & Migration
|August 21, 2012
Summary
Cellulose synthase-interacting protein 1 (CSI1) links plant cell wall microtubules to cellulose microfibril alignment. Without CSI1, microfibril alignment is disrupted, revealing its crucial role in cell wall construction.
Area of Science:
- Plant Biology
- Cell Biology
- Biochemistry
Background:
- The plant cell wall's extracellular matrix construction is challenging to control.
- Cellulose microfibril alignment dictates cell wall mechanical properties.
- Cortical microtubules are known to align with cellulose microfibrils.
Purpose of the Study:
- To investigate the mechanism linking cortical microtubules to cellulose microfibril alignment.
- To identify proteins mediating the interaction between microtubules and cellulose synthase complex.
Main Methods:
- Review of recent research on cellulose microfibril alignment.
- Analysis of the role of cellulose synthase-interacting protein 1 (CSI1).
- Phenotypic analysis of CSI1 mutants and microtubule depolymerization.
Main Results:
- CSI1 directly binds to both microtubules and cellulose synthase complex components.
- Loss of CSI1 function disrupts microfibril alignment with microtubules.
- Microtubule depolymerization phenocopies the effect of CSI1 absence in wild-type plants.
Conclusions:
- CSI1 is the key mediator connecting cortical microtubules to cellulose microfibril synthesis and alignment.
- Understanding CSI1 function enhances knowledge of cell wall construction and extracellular matrix control.
- This mechanism provides a model for how cells direct the assembly of their external environment.
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