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Conformational features of crystal-surface cellulose from higher plants
Remco J Viëtor1, Roger H Newman, Marie-Ann Ha
1Chemistry Department, Glasgow University, Scotland, UK.
The Plant Journal : for Cell and Molecular Biology
|June 14, 2002
Summary
Native cellulose surface chains exhibit altered conformations and hydrogen bonding. This structural flexibility allows for enhanced interactions with external molecules in various applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Structural Biology
Background:
- Native cellulose forms crystalline fibrils crucial for plant structure.
- Cellulose fibrils have a high proportion of surface glucan chains.
- Existing models propose a flat-ribbon 21 helical conformation with specific hydrogen bonds.
Purpose of the Study:
- To investigate the conformation and hydrogen bonding of native cellulose surface chains.
- To challenge the accepted crystal structure model for surface chains.
- To understand how surface chain structure affects interactions with external molecules.
Main Methods:
- Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
- Molecular modeling and computational studies.
- Analysis of hydrogen bonding patterns.
Main Results:
- Surface glucan chains display a different C-6 conformation, disrupting O-2 to O-6' hydrogen bonds.
- Evidence suggests alternate glucosyl residues twist, weakening O-3' to O-5 hydrogen bonds.
- A 'translational' chain conformation is energetically feasible and compatible with the 21 helix.
Conclusions:
- Native cellulose surface chains possess a more flexible conformation than previously thought.
- Reduced intramolecular hydrogen bonding enhances the capacity for external interactions.
- This structural insight has implications for cellulose applications in textiles, wood, paper, and plant biology.