CE-7 Enzyme Variants Expand Peracid Production Scope
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Solution Overview
Problem
There is a need to identify additional enzyme catalysts with significant perhydrolytic activity for the production of peroxycarboxylic acids, as existing enzymes may not be sufficient for all applications, and some polypeptide sequences within the CE-7 carbohydrate esterase family lack the reported 'HE' submotif, which is associated with perhydrolytic activity.
Innovation Solution
A process involving a polypeptide with perhydrolytic activity, having an amino acid sequence with at least 80% identity to a specific sequence (SEQ ID NO: 8), where the amino acid residue bound to the C-terminal side of the catalytic histidine at position 299 is not glutamic acid, is used to produce peroxycarboxylic acids by combining substrates like triacetin or 4-acetoxybenzoic acid with a source of peroxygen under suitable reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing CE-7 enzymes with the conserved 'HE' submotif are used for perhydrolysis, then perhydrolytic activity is achieved, but the scope of available enzyme catalysts is limited
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid residue at position 304 from glutamic acid (in traditional HE motif) to other residues such as alanine, aspartic acid, or serine (creating HX motif where X≠E). This structural parameter change maintains perhydrolytic activity while expanding the scope of enzyme catalysts beyond the conserved HE motif requirement
Solution Approach 2:
The patent achieves universality by demonstrating that multiple amino acid residues can fulfill the same functional role in the catalytic mechanism. The HX motif (where X is any residue except glutamic acid) performs the same perhydrolytic function as the traditional HE motif, making the enzyme family more versatile and adaptable for various peroxycarboxylic acid production applications
2Stability of the object's composition
If polypeptide sequences without the 'HE' submotif are excluded from CE-7 family, then structural consistency is maintained, but potential perhydrolytic enzymes are missed
Solution Approach 1:
The patent applies inversion by reversing the traditional classification criterion. Instead of excluding sequences without the HE motif, the patent includes them by demonstrating they possess perhydrolytic activity through alternative motifs (HX where X≠E). This inverted approach expands enzyme catalyst identification from 0 to many potential candidates
Solution Approach 2:
The patent changes the classification parameter from strict presence of HE motif to functional presence of HX motif (where X can be any residue except glutamic acid). This parameter change allows structural variations while maintaining functional consistency, thereby improving enzyme catalyst identification productivity
3Adaptability or versatility
If a broader range of amino acid residues is accepted at position 304, then more enzyme variants are available, but structural definition becomes less precise
Solution Approach 1:
The patent applies local quality by specifying that only the residue at position 304 (X in HX motif) can vary among alanine, aspartic acid, or serine, while the rest of the enzyme structure including the catalytic histidine at position 299 and the HX motif framework remains conserved. This localized flexibility maintains structural definition precision while enabling enzyme variant diversity
Solution Approach 2:
The patent changes the structural definition parameter from requiring exactly glutamic acid at position 304 (HE motif) to accepting alanine, aspartic acid, or serine (HX motif where X≠E). This controlled parameter change expands enzyme variants availability while maintaining sufficient structural definition through the conserved HX motif framework and catalytic machinery
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
This approach effectively produces peroxycarboxylic acids suitable for use in disinfection, bleaching, and personal care products, providing a new subgroup of CE-7 carbohydrate esterases with perhydrolytic activity that can be used in multi-component systems for efficient generation and delivery of peroxycarboxylic acids.
Implementation Method 1
Enzymes structurally classified as members of family 7 of the carbohydrate esterases (CE-7) have been employed as perhydrolases to catalyze the reaction of hydrogen peroxide (or alternative peroxide reagent) with alkyl esters of carboxylic acids in water at a basic to acidic pH range (from ca. pH 10 to ca. pH 5) to produce an efficacious concentration of a peroxycarboxylic acid
Data Source
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AI summary
Acetyl xylan esterases and variants thereof having perhydrolytic activity are provided for producing peroxycarboxylic acids from carboxylic acid esters and a source of peroxygen. Multi-component peracid generation systems comprising an enzyme catalyst having perhydrolytic activity are also provided, as are methods of using the present enzyme catalyst to produce peroxycarboxylic acids. The polypeptide having perhydrolytic activity may be used to produce peroxycarboxylic acids suitable for use in a variety of applications such as cleaning, disinfecting, sanitizing, bleaching, wood pulp processing, paper pulp processing, and personal care applications.