Engineered Transaminase Polypeptides for Stable Chiral Amine Synthesis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transaminases used for stereoselective synthesis of chiral amines suffer from instability and narrow substrate recognition profiles, limiting their commercial applicability.
Innovation Solution
Engineered transaminase polypeptides with altered properties, including improved thermostability, enzymatic activity, and substrate versatility, are developed through targeted residue modifications, enabling efficient conversion of various amine acceptor substrates to chiral amine products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing transaminases are used for stereoselective synthesis, then chiral amine products can be produced, but the enzymes suffer from instability and narrow substrate recognition profiles
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues at positions 85, 177, and 253 in the transaminase sequence to alter enzyme properties. These residue modifications change the physical and chemical parameters of the enzyme, enabling improved thermostability and expanded substrate recognition profiles while maintaining catalytic function
Solution Approach 2:
The invention applies local quality by making targeted modifications at specific residue positions (85, 177, 253) rather than global changes. Each position is selectively modified to address particular functional requirements - improving stability at some positions while enhancing substrate recognition at others, allowing different regions of the enzyme to have optimized properties
2Adaptability or versatility
If transaminases with improved substrate versatility are engineered, then broader amine acceptor substrates can be converted, but enzyme complexity increases
Solution Approach 1:
The patent applies local quality by making targeted modifications at specific residue positions (85, 177, 253) rather than global changes. Each position is selectively modified to address particular functional requirements - improving stability at some positions while enhancing substrate recognition at others, allowing different regions of the enzyme to have optimized properties
Solution Approach 2:
The engineered transaminases achieve universality by being designed to accept multiple types of amine acceptor substrates including aliphatic, aromatic, and heterocyclic compounds. The residue modifications create a more universal enzyme that can perform the same catalytic function across diverse substrate classes without requiring separate enzymes for each substrate type
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 engineered transaminases exhibit enhanced catalytic performance, with increased activity, stability, and stereoselectivity, facilitating the stereoselective synthesis of chiral amines under diverse conditions.
Implementation Method 1
Aminotransferases, also known as transaminases (E.C. 2.6.1) catalyze the transfer of an amino group, a pair of electrons, and a proton from a primary amine of an amino donor substrate to the carbonyl group of an amino acceptor molecule
Data Source
AI summary
The present disclosure provides engineered transaminase enzymes having improved properties as compared to a naturally occurring wild-type transaminase enzyme. Also provided are polynucleotides encoding the engineered transaminase enzymes, host cells capable of expressing the engineered transaminase enzymes, and methods of using the engineered transaminase enzymes to synthesize a variety of chiral compounds.