Low-DMS Barley via MMT Gene Mutation
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Solution Overview
Problem
Current methods for reducing dimethyl sulfide (DMS) levels in beer are inefficient and energy-intensive, often altering the characteristics of malt or wort and failing to completely eliminate DMS, which imparts undesirable flavors and aromas.
Innovation Solution
Developing barley plants with a mutation in the methionine S-methyltransferase (MMT) gene that results in a total loss of MMT activity, thereby blocking the formation of DMS precursor S-methyl-L-methionine (SMM), leading to beverages with significantly reduced or absent DMS levels, improving flavor profiles and reducing energy consumption in beer production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods are used to reduce DMS levels in beer, then some DMS reduction is achieved, but the methods are energy-intensive and fail to completely eliminate DMS
Solution Approach 1:
The invention applies preliminary action by using mutagenesis and selection to create barley varieties with naturally low SMM content before brewing. This pre-modification of the raw material prevents DMS precursor formation at the source, eliminating the need for energy-intensive post-brewing DMS reduction processes and enabling complete DMS elimination
2Object-affected harmful factors
If conventional methods are used to reduce DMS levels in beer, then some DMS reduction is achieved, but the methods fail to completely eliminate DMS
Solution Approach 1:
The invention uses preliminary genetic modification through mutagenesis and selection to create barley varieties with naturally low SMM content. This pre-modification ensures that DMS precursors are blocked at the source, providing reliable and complete DMS elimination rather than partial reduction achieved by conventional post-brewing methods
Solution Approach 2:
The invention applies the extraction principle by removing the harmful SMM precursor from the system through selection of mutant barley varieties. By eliminating the precursor substance before brewing, the system achieves complete DMS removal without relying on post-brewing extraction or reduction techniques
3Object-affected harmful factors
If barley plants with MMT gene mutation are developed, then DMS levels are significantly reduced, but the development process requires mutagenesis and screening
Solution Approach 1:
The invention applies self-service by using spontaneous mutagenesis and natural selection processes to identify and propagate low-SMM barley varieties. The system leverages nature's own mechanisms rather than requiring complex external intervention, allowing the barley plants to self-modify and self-select for the desired trait through controlled mutagenesis and phenotypic screening
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 approach results in beer with superior taste properties, characterized by low DMS levels, enhanced estery flavors, and reduced energy input in production processes, offering a more sustainable and flavorful brewing method.
Implementation Method 1
the methionine (Met)-S-methyltransferase (MMT) enzyme catalyzes the transfer of a methyl group from S-adenosyl-methionine (AdoMet) to Met, forming SMM
Implementation Method 2
The latter compound can in turn serve as methyl donor for Met synthesis from homocysteine (Hcy), a reaction catalyzed by the enzyme Hcy-S-methyltransferase (HMT)
Data Source
AI summary
According to the invention, there is provided barley-derived beverages characterized by notably reduced levels of both dimethyl sulfide (DMS) and/or its precursor S-methyl-L-methionine (SMM), or lacking said compounds. In addition, the invention relates to methods for producing the above-mentioned beverages—and also to barley plants useful in the preparation of such beverages, as well as other plant products prepared from said plants. Utilization of the invention clears the way for making improved production procedures of beverages with improved taste profiles, and promises also for notable reductions in the thermal energy input for production of beer.