Engineered Keratinase Composition for Feather Waste Degradation

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Solution Overview

Problem

Existing keratinases lack sufficient activity, specificity, and stability for efficiently processing keratin-containing materials, such as poultry feathers, leading to challenges in waste management and conversion into value-added products.

Innovation Solution

Engineered, modified, or mutated serine proteases (KerS) from Bacillus cereus strains, such as S1, S13, S15, S26, or S39, with enhanced activity, specificity, and/or thermostability, are designed and expressed to degrade keratin-containing materials effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional proteases (papain, pepsin, trypsin) are used to treat keratin-containing materials, then the processing cost is reduced, but the degradation efficiency is insufficient due to keratin's high disulfide-bond resistance

Engineering Contradiction:

Improveprocessing costVSAvoiddegradation efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent employs parameter changes by optimizing reaction conditions including pH (near-alkaline range), temperature (thermophilic conditions), and enzyme concentration to enhance keratinase activity. These parameter optimizations enable the enzyme to effectively break down disulfide bonds in keratin while maintaining cost-effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite enzymatic systems by combining keratinase with other proteases or adding chemical agents that work synergistically to break down keratin's disulfide bonds. This composite approach overcomes the resistance of keratin to single-enzyme treatment while maintaining economic feasibility

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If naturally-occurring keratinases are used, then the enzyme can degrade keratin at near-alkaline pHs and thermophilic temperatures, but the activity level, specificity, and stability are insufficient

Engineering Contradiction:

ImprovepH and temperature rangeVSAvoidactivity level and stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the keratinase enzyme into modular domains, allowing independent optimization of different functional regions. This enables enhancement of catalytic activity in the active site while maintaining thermostability and pH tolerance in structural domains

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by introducing site-specific mutations in the active site region to enhance substrate binding affinity and catalytic efficiency, while keeping other regions unchanged to preserve overall enzyme stability and adaptability

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If keratin-containing waste products are not treated, then the processing cost is minimized, but pathogenic microorganisms and pollutants are generated

Engineering Contradiction:

Improveprocessing costVSAvoidpathogenic microorganisms and pollutants

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent converts harmful keratin-containing waste into beneficial products by using keratinase to degrade keratin into amino acids and peptides. These degradation products can be utilized as fertilizers, feed supplements, or chemical precursors, transforming waste management costs into value-added product generation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent employs self-service by using keratinase to autonomously degrade keratin waste without requiring complex pretreatment or additional chemical agents. The enzyme naturally binds to and hydrolyzes keratin proteins, providing self-contained waste treatment that eliminates pathogenic risks

Inventive Principle:

Principle #25Self-service

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 engineered keratinases exhibit 1.51-3.73-fold increased activity, allowing efficient degradation of keratin-containing materials, including feathers, and can be used in various applications like feed additives, biogas production, textile processing, and cosmetic products.

Implementation Method 1

Keratinase breaks down keratin at near-alkaline pHs and at thermophilic temperatures

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

Engineered, modified, or mutated serine proteases (KerS) from Bacillus cereus strains with enhanced activity, specificity, and/or thermostability, are designed and expressed to degrade keratin-containing materials effectively

Methodology Applied

Scientific EffectEnzyme catalysis: Enzyme

Data Source

PatentUS12410421B2Keratinase composition

Publication Date: 2025.09.09 IMAM ABDULRAHMAN BIN FAISAL UNIV

AI summary

Engineered, modified, or mutated Bacillus strains that produce keratinases or serine proteases (KerS) that biologically degrade keratin-containing materials, such as feathers; compositions containing these Bacillus strains or the keratinases they produce, and methods for biologically degrading keratin-containing materials using these strains or keratinases.