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Cellulose microfibrils in plants: biosynthesis, deposition, and integration into the cell wall
1Plant Molecular Science Group, Institute of Biomedical and Life Sciences, University of Glasgow, United Kingdom.
International Review of Cytology
|June 30, 2000
Summary
Cellulose, a key plant component, forms microfibrils through cellulose synthase complexes. Its molecular size control and specific synthesis mechanisms remain areas for further scientific investigation.
Area of Science:
- Biochemistry
- Plant Biology
- Molecular Biology
Background:
- Cellulose is a primary structural component in plants, algae, fungi, bacteria, and some animals.
- It forms microfibrils composed of crystalline allomorphs (cellulose I alpha and I beta) from 500-15,000 glucose units.
- The precise control over cellulose molecular size is currently unknown.
Purpose of the Study:
- To explore the biosynthesis and assembly of cellulose microfibrils.
- To investigate the role of cellulose synthase complexes and their genetic basis.
- To understand the factors influencing microfibril orientation and cell growth.
Main Methods:
- Isolation and purification of cellulose synthase from bacteria.
- Genetic analysis of cellulose synthase genes in plants and bacteria.
- Characterization of cellulose-deficient mutants.
- Analysis of deduced amino acid sequences for catalytic mechanisms.
Main Results:
- Cellulose synthase complexes in the plasma membrane elongate microfibrils.
- UDP-glucose, derived from sucrose, is a potential precursor, possibly involving lipid-linked intermediates.
- Cellulose synthase has been purified from bacteria but not plants; disruption may lead to callose formation.
- Genes for cellulose synthase have been identified in both bacteria and plants.
- Cortical microtubules influence microfibril orientation, directing cell growth.
Conclusions:
- Cellulose biosynthesis involves complex enzymatic machinery and genetic regulation.
- While bacterial cellulose synthesis is better understood, plant mechanisms require further elucidation.
- Microfibril assembly and integration into the cell wall involve self-assembly and interactions with matrix polymers, guided by cellular structures like microtubules.
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