Database Mining for Novel Halohydrin Dehalogenase Enzymes
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Solution Overview
Problem
The limited availability of functionally diverse halohydrin dehalogenases (HHDHs) hinders the expansion of their applications in biocatalysis, as only a few enzymes have been cloned and expressed, restricting the production of enantiopure compounds and novel carbon-carbon, carbon-nitrogen, or carbon-oxygen bonds.
Innovation Solution
A method is developed to identify novel HHDH enzymes by searching biomolecule databases for specific amino acid sequence motifs, such as 'T-x(4)-[FY]-x-G' and 'S-x(12)-Y-x(3)-R', which are used to verify halohydrin dehalogenase activity, enabling the discovery of new enzymes like HheD3 with proven dehalogenase activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If database mining with specific sequence motifs is used to identify novel HHDH enzymes, then the diversity and number of available HHDH enzymes is expanded, but the complexity of enzyme identification and verification increases
Solution Approach 1:
The patent applies preliminary action by defining specific sequence motifs (T-x(4)-[FY]-x-G and S-x(12)-Y-x(3)-R) in advance that are characteristic of HHDH enzymes. These pre-defined motifs serve as search criteria that can be directly applied to database mining operations, eliminating the need for complex de novo enzyme characterization and significantly streamlining the identification process while maintaining high accuracy in finding novel HHDH variants.
2Productivity
If only a few known HHDH sequences are used, then the reliability of enzyme function is ensured, but the productivity and application range of biocatalysis is limited
Solution Approach 1:
The patent employs copying by using the known sequence motifs from validated HHDH enzymes as templates to identify and verify novel enzyme sequences in databases. By copying the characteristic motif patterns (T-x(4)-[FY]-x-G and S-x(12)-Y-x(3)-R) from proven enzymes, the method enables systematic discovery of new HHDH variants while maintaining functional reliability through motif conservation, thus expanding productivity without sacrificing certainty of enzyme function.
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 expands the repertoire of HHDH enzymes, enhancing the diversity of biocatalysts available for converting halohydrins to epoxides and vice versa, thereby improving the production of enantiopure compounds and complex molecules.
Implementation Method 1
Halohydrin dehalogenases (also called haloalcohol dehalogenases, haloalcohol/halohydrin epoxidases, or hydrogen-halide lyases; EC 4.5.1.-) (HHDHs) are biotechnologically relevant enzymes that catalyze the reversible dehalogenation of β-haloalcohols under epoxide formation
Implementation Method 2
these enzymes can also be applied in the formation of novel carbon-carbon, carbon-nitrogen, or carbon-oxygen bonds. This is due to their promiscuous epoxide ring-opening activity accepting also other nucleophiles (e.g. cyanide, azide, or nitrite) beside halides
Data Source
Figure 1
AI summary
The invention is related to the use of halohydrin dehalogenase HheD3 in the conversion of halohydrins into epoxides as well as to the use of said halohydrin dehalogenase in the conversion of epoxides into alcohols.