Methods for the preparation of β-amino acids
AssigneeWisconsin Alumni Research Foundation
InventorsPerry A. Frey, Frank J. Ruzicka
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Abstract
Purified β-amino acids are of considerable interest in the preparation of pharmacologically active compounds and industrial precursors. Although enantiomerically pure β-amino acids can be produced by standard chemical synthesis, this traditional approach is time consuming, requires expensive starting materials, and results in a racemic mixture which must be purified further. However, DNA molecules encoding lysine 2,3-aminomutase can be used to prepare β-amino acids by methods that avoid the pitfalls of chemical synthesis. The present invention provides a method of producing enantiomerically pure β-amino acids from α-amino acids comprising catalyzing the conversion of an α-amino acid to a corresponding β-amino acid by utilizing a lysine 2,3-aminomutase as the catalyst.
Claims11
A method of producing a β-amino acid comprising:
- (a) culturing a host cell comprising an expression vector that encodes a lysine 2,3-aminomutase in the presence of L-alanine, wherein the cultured host cell expresses lysine 2,3-aminomutase, and catalyzing the conversion of the L-alanine to a corresponding β-amino acid by utilizing the lysine 2,3-aminomutase as the catalyst, wherein the lysine 2,3-aminomutase has the amino acid sequence selected from the group consisting of SEQ ID NO:
- 2 and a variant thereof consisting of one amino acid substitution;
- and
- (b) isolating the β-amino acid from the cultured host cells.
A method of producing a β-amino acid comprising:(a) incubating L-alanine in a solution containing purified lysine 2,3-aminomutase, said solution containing all cofactors required for lysine 2,3 -aminomutase activity;
- and catalyzing the conversion of the L-alanine to a corresponding β-amino acid by utilizing the lysine 2,3-aminomutase as the catalyst, wherein the lysine 2,3-aminomutase has the amino acid sequence selected from the group consisting of SEQ ID NO:
- 2 and a variant thereof consisting of one amino acid substitution;
- and
- b) isolating the corresponding β-amino acid from the incubation solution.
Dependencies are inferred from the claim text.