Enhanced BAAT Enzyme for 3-HP Production Pathway
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Solution Overview
Problem
The existing pathway for producing 3-hydroxypropionic acid (3-HP) via beta-alanine is inefficient, requiring enhanced beta-alanine/alpha-ketoglutarate aminotransferase (BAAT) activity to improve conversion rates of beta-alanine to malonyl semialdehyde and subsequently to 3-HP.
Innovation Solution
Novel BAAT nucleic acid and amino acid sequences with enhanced activity are introduced, allowing for increased production of malonyl semialdehyde and downstream products like 3-HP, which are used to transform cells to produce 3-HP and its derivatives, including the use of specific mutations and enzyme combinations such as PEP carboxylase, aspartate aminotransferase, and 3-HP dehydrogenase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional BAAT is used in the beta-alanine to 3-HP pathway, then the pathway can function, but the conversion efficiency and production yield are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of BAAT to create variants with improved catalytic properties. Specific mutations in the BAAT sequence alter the enzyme's kinetic parameters, increasing its ability to convert beta-alanine to malonyl semialdehyde, which subsequently improves overall pathway productivity and 3-HP yield.
Solution Approach 2:
The patent creates multiple copies of the improved BAAT gene in heterologous host cells to amplify enzyme production. By introducing replicated copies of the optimized BAAT sequence into bacterial or yeast cells, the system achieves sufficient enzyme concentration to drive high-yield 3-HP production from beta-alanine.
2Productivity
If the BAAT activity is enhanced to improve conversion rates, then more malonyl semialdehyde and 3-HP are produced, but this requires novel enzyme sequences and cell transformation
Solution Approach 1:
The patent applies preliminary action by pre-optimizing the BAAT enzyme sequence through in silico mutagenesis and in vitro characterization before introducing it to host cells. The enzyme variants are screened and characterized for improved activity, stability, and expression properties in advance, which simplifies the subsequent cell transformation and production process.
Solution Approach 2:
The patent uses intermediary vectors and plasmids to facilitate the introduction of improved BAAT genes into host cells. These intermediary genetic constructs contain appropriate promoters, ribosome binding sites, and selection markers that mediate efficient gene delivery and expression, reducing the complexity of direct genome integration.
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 enhanced BAAT activity leads to increased production of 3-HP and its derivatives, improving the efficiency and yield of the biochemical pathway, making it suitable for industrial applications such as nutritional additives and preservatives.
Implementation Method 1
beta-alanine can be converted to 3-HP via malonyl semialdehyde, using beta-alanine/alpha-ketoglutarate aminotransferase (BAAT)
Implementation Method 2
beta-alanine can be converted to 3-HP via malonyl semialdehyde, using beta-alanine/alpha-ketoglutarate aminotransferase (BAAT) and a 3-HP dehydrogenase
Data Source
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AI summary
The present disclosure provides novel beta-alanine/alpha ketoglutarate aminotransferase nucleic acid and protein sequences having increased biological activity. Also provided are cells containing such enzymes, as well as methods of their use, for example to produce malonyl semialdehyde and downstream products thereof, such as 3-hydroxypropionic acid and derivatives thereof.