Dockerin Protein Complex for Cohesin Binding in Yeast
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Solution Overview
Problem
Current methods for constructing artificial cellulosomes in eukaryotic microorganisms like yeast face challenges in maintaining cohesin-dockerin binding ability due to sugar chain modification, and there is a lack of reports on improving this binding in such organisms.
Innovation Solution
A protein complex is developed using a dockerin from Clostridium thermocellum with specific sequences that either lack intrinsic predicted N-type sugar chain modification sites or have asparagine replaced with aspartic acid, enhancing cohesin-dockerin binding and saccharification ability in eukaryotic microorganisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a foreign protein from bacteria is produced in yeast or other eukaryotic microorganisms, then production of cellulase is achieved, but interaction between proteins is affected by sugar chain modification
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the dockerin protein specifically at N-type sugar chain modification sites. By substituting asparagine residues with glutamine or leucine at predicted sugar chain modification sites, the invention changes the chemical parameters of the protein to prevent glycosylation while maintaining the cohesin-dockerin binding ability, thus resolving the contradiction between achieving protein production and maintaining protein interaction reliability
Solution Approach 2:
The invention extracts and removes the problematic sugar chain modification sites from the dockerin protein sequence. By identifying and eliminating specific asparagine residues that serve as N-type sugar chain modification sites, the patent separates the desirable cohesin-dockerin binding function from the harmful sugar chain modification effect, allowing cellulase production in yeast without compromising protein interaction
2Force
If amino acid substitution is made in dockerin domains to improve binding, then cohesin-dockerin binding ability is enhanced, but binding specificity may be altered
Solution Approach 1:
The patent applies local quality by making targeted amino acid substitutions only at specific locations - the N-type sugar chain modification sites - rather than throughout the entire dockerin domain. This localized modification approach enhances cohesin-dockerin binding ability by preventing sugar chain interference while preserving the overall binding interface and specificity of the dockerin-cohesin interaction
Solution Approach 2:
The invention changes specific parameters (amino acid residues) at sugar chain modification sites to prevent glycosylation, thereby enhancing binding ability without altering the fundamental binding mechanism and specificity of the cohesin-dockerin interaction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The protein complex effectively improves cohesin-dockerin binding and saccharification efficiency in eukaryotic microorganisms, enabling efficient cellulose degradation and production of useful substances.
Implementation Method 1
Scaffolding proteins have sites called cohesins, and cellulases are known to bind to these cohesins via their own dockerins
Implementation Method 2
interaction between proteins can be affected by giant sugar chain modification
Data Source
AI summary
It is an object to provide a protein having a dockerin, which is suited to production in yeasts and other eukaryotic microorganism in which sugar chain modification is predicted, and which provides excellent cohesin-dockerin binding ability, along with a use thereof. The present invention uses, as a protein for constructing a protein complex using a scaffolding protein having a type I cohesin from Clostridium thermocellum, a protein having a dockerin having at least one dockerin-specific sequence which is a dockerin-specific sequence associated with cohesin binding in type I dockerins from C. thermocellum, and which either has no intrinsic predicted N-type sugar chain modification site or has aspartic acid substituted for the asparagine of an intrinsic predicted N-type sugar chain modification site.