GH5 Polypeptides Degrade Xanthan Gum for Drilling Fluid Viscosity Control
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Solution Overview
Problem
Current methods for degrading xanthan gum require multiple enzymatic activities, including xanthan lyase and endo-beta-1,4-glucanase, and no enzymes within the glycosyl hydrolase family 5 (GH5) have been identified with xanthan degrading activity.
Innovation Solution
Discovery of GH5 polypeptides with xanthan degrading activity that do not belong to any previously known glycosyl hydrolase family with this enzymatic activity, offering synergistic improved wash performance when combined with xanthan lyase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple enzymatic activities (xanthan lyase and endo-beta-1,4-glucanase) are used to degrade xanthan gum, then complete degradation is achieved, but device complexity and process complexity increase
Solution Approach 1:
The patent merges the functions of multiple enzymes (xanthan lyase and endo-beta-1,4-glucanase) into a single GH5 polypeptide that exhibits both xanthan lyase activity and endo-beta-1,4-glucanase activity. This single polypeptide can completely degrade xanthan gum without requiring separate enzymatic steps, thereby reducing process complexity while maintaining complete degradation capability.
Solution Approach 2:
The GH5 polypeptide is designed to perform multiple functions: it acts as both a xanthan lyase (cleaving beta-D-mannosyl-alpha-beta-D-1,4-glucuronosyl bonds) and an endo-beta-1,4-glucanase (hydrolyzing beta-1,4-glycosidic bonds in the cellulose backbone). This multi-functionality eliminates the need for separate enzymes and simplifies the overall degradation system.
2Stability of the object's composition
If xanthan gum is used to thicken drilling mud and maintain suspension, then solids remain suspended when circulation stops, but viscosity must be reduced for effective wash performance
Solution Approach 1:
The patent employs a dynamic enzymatic degradation system where the GH5 polypeptide can be activated to rapidly reduce xanthan gum viscosity when needed for wash performance, while allowing the system to return to high viscosity state for suspension stability. The enzymatic action provides dynamic control over the pseudoplasticity and viscosity characteristics of the drilling fluid.
Solution Approach 2:
The invention changes the molecular structure parameters of xanthan gum through enzymatic hydrolysis. The GH5 polypeptide cleaves specific bonds in the xanthan polymer chain, reducing polymer length and molecular weight, which directly reduces viscosity while maintaining the ability to suspend solids through modified rheological properties.
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
These GH5 polypeptides enable efficient degradation of xanthan gum, enhancing wash performance and viscosity reduction, particularly in applications like drilling fluids and oil extraction.
Implementation Method 1
Glycosyl hydrolases are enzymes that catalyze the hydrolysis of the glycosyl bond to release smaller sugars
Implementation Method 2
polypeptides having xanthan degrading activity, i.e., having activity on xanthan gum
Data Source
AI summary
The present invention relates to polypeptides having xanthan degrading activity, and polynucleotides encoding the polypeptides. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides.