Xylan-Degrading Catalytic Flagellar Nanorods

Area of Science:

• Biotechnology and Protein Engineering
• Nanomaterials Science
• Enzyme Technology

Background:

• Flagellin (FliC) is a self-assembling protein forming bacterial flagella.
• Xylanase A (XynA) is an enzyme that degrades xylan, a complex polysaccharide.
• Enzyme immobilization is crucial for industrial applications but often relies on synthetic scaffolds.

Purpose of the Study:

• To engineer a novel self-assembling catalytic nanorod using a fusion protein.
• To create stable, xylan-degrading nanostructures with high enzyme surface density.
• To explore a new strategy for enzyme immobilization via self-assembling protein scaffolds.

Main Methods:

• Constructed a fusion protein (FliC-XynA) combining Salmonella flagellin and B. subtilis xylanase A.
• Overexpressed the FliC-XynA chimera in a flagellin-deficient Salmonella host for secretion and purification.
• Induced polymerization using ammonium sulfate to form filamentous nanorods.

Main Results:

• Successfully produced stable FliC-XynA nanorods with high surface density of xylanase activity.
• The nanorods exhibited resistance to proteolytic degradation.
• Enzymatic activity was maintained over extended periods.

Conclusions:

• Self-assembling catalytic nanorods can be efficiently produced using protein fusions.
• This approach offers a stable and effective alternative to traditional enzyme immobilization methods.
• The FliC-XynA nanorods demonstrate potential for biotechnological applications in xylan degradation.