申请人:Technische Universität Graz
公开号:EP2574667A1
公开(公告)日:2013-04-03
The present invention relates to a variant of an alpha-keto acid dependent enzyme catalyzing the oxidative decarboxylation of an alpha-keto acid having an amino acid sequence varying from that of a precursor alpha-keto acid dependent enzyme catalyzing the oxidative decarboxylation of an alpha-keto acid, said precursor enzyme comprising
- a motif (A) X1X2X3X4(X)nFGX5X6NX7X8X9X10X11, wherein X1 is serine, X2 is an amino acid residue selected from the group consisting of threonine, lysine, isoleucine, arginine and glutamine, X3 is valine or alanine and X4 is an amino acid residue selected from the group consisting of valine, methionine and isoleucine, X5 and X6 are independently any amino acid residue, X7 is isoleucine or phenylalanine, X8 is an amino acid residue selected from the group consisting of lysine, glutamine, arginine and threonine, X9 is an amino acid residue selected from the group consisting of alanine, serine and glycine, X10 is leucine or isoleucine, X11 is tyrosine or phenylalanine, X is any amino acid residue, and n is an integer between 100 and 150, and
- a metal ion binding motif (B) H(X12)mH(X13)oE, wherein X12 and X13 are independently any amino acid residue, m and o are independently an integer between 70 and 90,
wherein amino acid residue X1 and/or amino acid residue X3 within motif (A) of the variant is an amino acid residue having a molecular volume of more than 150 Å3 and/or amino acid residue X11 within motif (A) of the variant has an amino acid residue having a molecular volume of less than 120 Å3.
本发明涉及一种催化α-
酮酸氧化脱羧的α-
酮酸依赖性酶的变体,其
氨基酸序列与催化α-
酮酸氧化脱羧的前体α-
酮酸依赖性酶的
氨基酸序列不同,所述前体酶包括
- 图案 (A) X1X2X3X4(X)nFGX5X6NX7X8X9X10X11 其中 X1 是
丝氨酸,X2 是选自苏
氨酸、赖
氨酸、
异亮氨酸、精
氨酸和谷
氨酰胺组成的组的
氨基酸残基,X3 是缬
氨酸或丙
氨酸,X4 是选自缬
氨酸、蛋
氨酸和
异亮氨酸组成的组的
氨基酸残基,X5 和 X6 独立地是任何
氨基酸残基、X7 是
异亮氨酸或苯丙
氨酸,X8 是选自由赖
氨酸、谷
氨酰胺、精
氨酸和苏
氨酸组成的组的
氨基酸残基,X9 是选自由丙
氨酸、
丝氨酸和甘
氨酸组成的组的
氨基酸残基,X10 是亮
氨酸或
异亮氨酸,X11 是
酪氨酸或苯丙
氨酸,X 是任何
氨基酸残基,n 是 100 到 150 之间的整数,以及
-
金属离子结合基团 (B)H(X12)mH(X13)oE,其中 X12 和 X13 独立地是任何
氨基酸残基,m 和 o 独立地是介于 70 和 90 之间的整数、
其中变体图案(A)中的
氨基酸残基 X1 和/或
氨基酸残基 X3 是分子体积大于 150 Å3 的
氨基酸残基,和/或变体图案(A)中的
氨基酸残基 X11 是分子体积小于 120 Å3 的
氨基酸残基。