Zwitterionic Polypeptides: Chemoenzymatic Synthesis and Loosening Function for Cellulose Crystals

Area of Science:

• Polymer Chemistry
• Material Science
• Plant Biotechnology

Background:

• Cellulose dissociation is crucial for material modification.
• Existing methods often require harsh conditions.

Purpose of the Study:

• To synthesize a zwitterionic polypeptide for effective cellulose dissociation.
• To evaluate its efficacy and impact on cellulose structure and plant cells.

Main Methods:

• Chemoenzymatic polymerization and postfunctionalization to create a GlyHisGly polypeptide.
• Treatment of tunicate cellulose nanocrystals and cultured plant cells.
• Atomic force microscopy (AFM) for morphological and mechanical analysis.

Main Results:

• The zwitterionic polypeptide efficiently dissociated cellulose nanocrystals and plant cell walls under mild conditions (1-2 mg mL^-1).
• AFM revealed dissociation of cellulose microfibrils and amorphous layers, increasing elastic modulus without altering crystal structure.
• Negligible cytotoxicity was observed in plant cells.

Conclusions:

• A mild, non-cytotoxic zwitterionic polypeptide effectively loosens cellulose microfibrils/nanocrystals.
• This technique holds significant potential for cellulose modification in various scientific fields.
• The study presents a promising advancement for polymer chemistry, material science, and plant biotechnology.