Modified Candida Lipase for Selective Short-Chain Fatty Acid Release
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Solution Overview
Problem
Microbial lipases are more specific for long-chain fatty acids than short-chain fatty acids, resulting in dairy products with an unfavorable flavor profile due to the release of long-chain fatty acids, which are associated with a soap-like odor.
Innovation Solution
A modified lipase derived from Candida cylindracea with specific amino acid substitutions, such as asparagine at position 428 or phenylalanine, methionine, or isoleucine at position 429, is developed to selectively release short-chain to medium-chain fatty acids, mimicking the specificity of animal lipases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microbial lipases are used to process milk fat, then the enzyme preparation meets kosher or halal requirements, but the lipase releases long-chain fatty acids that produce an unfavorable soap-like odor in dairy products
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the lipase enzyme to alter its substrate specificity. Specific amino acid residues in the substrate-binding pocket are changed to reduce affinity for long-chain fatty acids while maintaining activity on short-chain fatty acids, thereby changing the enzyme's catalytic parameters to produce the desired flavor profile without compromising kosher or halal compliance
Solution Approach 2:
The patent creates a modified microbial lipase that copies the substrate specificity characteristics of animal lipases (which naturally prefer short-chain fatty acids). By designing the microbial enzyme to mimic the binding properties of animal lipases through amino acid substitutions, the invention achieves the same favorable flavor enhancement effect while maintaining the advantages of microbial production
2Object-generated harmful factors
If traditional animal-derived lipases are used, then short-chain fatty acids are selectively released for favorable flavor, but the enzyme preparation does not meet kosher or halal requirements
Solution Approach 1:
The patent creates a modified microbial lipase that copies the substrate specificity characteristics of animal lipases. By designing the microbial enzyme to mimic the binding properties of animal lipases through amino acid substitutions, the invention achieves the same favorable flavor enhancement effect while maintaining the advantages of microbial production for kosher or halal compliance
Solution Approach 2:
The patent uses a genetically modified microbial lipase as an intermediary solution between animal lipases and traditional microbial lipases. This intermediary enzyme combines the desirable substrate specificity of animal lipases with the production advantages and religious compliance of microbial enzymes, serving as a bridge that resolves the contradiction between flavor quality and religious compliance
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 modified lipase achieves a flavor profile similar to that of animal lipases, enhancing the flavor of dairy products by selectively releasing C4 to C8 fatty acids, particularly optimizing the flavor for C4 fatty acid, thereby improving the taste of dairy products.
Implementation Method 1
the action of the lipase on milk fat will give a profile that many of the fatty acids released from the milk fat have a long chain
Data Source
AI summary
The present invention addresses a problem of providing a lipase derived from a microorganism that is specific for short-chain to medium-chain fatty acids. A modified lipase is obtained by making a substitution in the amino acid sequence of a Candida cylindracea derived lipase, wherein the substitution is (1) a substitution of asparagine for an amino acid corresponding to the amino acid at position 428 in the amino acid sequence set forth in SEQ ID NO: 1; or (2) a substitution of phenylalanine, methionine, or isoleucine for an amino acid corresponding to the amino acid at position 429 in the amino acid sequence set forth in SEQ ID NO: 1.