Mannanase Variants for Surfactant-Stable Detergent Cleaning
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Solution Overview
Problem
Existing mannanase enzymes exhibit insufficient activity and stability in harsh conditions, particularly in detergent formulations with surfactants and pH ranges of 5-12, leading to inadequate removal of mannan-containing stains and fabric graying.
Innovation Solution
Development of mannanase variants with improved stability and activity in surfactant-containing formulations, specifically designed to maintain catalytic function at pH levels between 5-12, including variants at least 75% identical to specific SEQ ID NO sequences, and formulated into liquid detergent preparations with additional enzymes and stabilizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing mannanase enzymes are used in detergent formulations with surfactants and varying pH levels, then the detergent can be formulated with broad pH range (5-12), but the enzyme activity and stability become insufficient leading to inadequate stain removal
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the mannanase enzyme through site-directed mutagenesis. Specific amino acid residues are substituted to alter the enzyme's physical-chemical properties, particularly its pH stability profile and surfactant resistance, enabling it to maintain activity across the broad pH range of 5-12 while resisting denaturation by detergent surfactants
Solution Approach 2:
The patent applies local quality by making targeted local modifications to the enzyme's three-dimensional structure through specific amino acid substitutions at key positions. These localized changes in the enzyme's active site or structural domains enhance its stability and catalytic efficiency under harsh detergent conditions without altering the overall enzyme architecture
2Adaptability or versatility
If existing mannanase enzymes are used in harsh detergent conditions, then the detergent formulation can include surfactants, but the enzyme stability decreases leading to fabric graying and insufficient cleaning
Solution Approach 1:
The patent modifies enzyme stability parameters through amino acid substitution, changing the enzyme's resistance to surfactant-induced denaturation. The mutated enzyme maintains its structural integrity and catalytic function in the presence of anionic, cationic, and non-ionic surfactants, preventing fabric graying caused by enzyme degradation
Solution Approach 2:
The patent applies beforehand cushioning by pre-modifying the enzyme's structure through mutagenesis to anticipate and resist the destabilizing effects of surfactants. The engineered enzyme is pre-adapted to withstand harsh detergent conditions, cushioning against the harmful effects of surfactant exposure that would otherwise inactivate wild-type enzymes
3Productivity
If mannanase activity is enhanced for better stain removal, then cleaning efficacy improves, but the enzyme may become less stable in varying pH conditions
Solution Approach 1:
The patent simultaneously optimizes multiple parameters through coordinated amino acid substitutions. The mutations are designed to enhance catalytic rate constants (kcat) while also improving pH stability, achieving both high productivity and reliability in a single engineered enzyme variant that performs well across pH 5-12
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 improved mannanase variants effectively degrade mannan-containing stains, enhancing cleaning efficacy and preventing fabric graying by maintaining activity in detergent formulations with surfactants and varying pH levels.
Implementation Method 1
endo-1,4-beta-mannanases (EC 3.2.1.78), which hydrolyze the internal glycoside bonds in the mannan backbone
Implementation Method 2
The main enzyme type participating in the degradation of mannan backbones are endo-1,4-beta-mannanases (EC 3.2.1.78)
Data Source
AI summary
A mannanase at least 75% identical to SEQ ID NO: 2, SEQ ID NO: 3, or SEQ ID NO: 4, a poly-nucleotide encoding mannanase, an expression construct comprising the polynucleotide, and a host cell comprising the polynucleotide or the expression construct.