Combinatorial assembly and optimisation of designer cellulosomes: a galactomannan case study.

Area of Science:

• Biotechnology and Synthetic Biology
• Enzymology and Protein Engineering

Background:

• Designer cellulosomes are engineered enzyme complexes that enhance lignocellulosic biomass degradation.
• Current modular cloning methods for optimizing designer cellulosome architecture are time-consuming and complex.
• There is a need for efficient methods to construct and test diverse designer cellulosome variants.

Purpose of the Study:

• To extend the VersaTile combinatorial DNA assembly platform for rapid designer cellulosome construction.
• To develop a toolbox for efficient creation and optimization of designer cellulosomes.
• To demonstrate the platform's utility by constructing and optimizing a designer cellulosome for galactomannan degradation.

Main Methods:

• Developed a tile repository including dockerins, cohesins, linkers, tags, and enzymatic modules for VersaTile.
• Utilized the VersaTile platform for rapid assembly of designer cellulosome components.
• Constructed and optimized a trivalent designer cellulosome targeting the hemicellulose substrate galactomannan.

Main Results:

• The VersaTile platform enables the rapid construction and comparison of modular proteins, including designer cellulosomes.
• Key factors influencing designer cellulosome efficiency were identified as dockerin and linker selection, and enzyme ratio.
• The optimized designer cellulosome successfully hydrolyzed galactomannan, releasing mannose and galactose monomers.

Conclusions:

• The VersaTile platform significantly reduces technical hurdles in designer cellulosome development.
• This platform facilitates the rapid optimization of designer cellulosome architecture.
• VersaTile is expected to be foundational for developing more complex multi-enzyme systems.