Modified mevalonate kinase with reduced feedback inhibition
The present invention relates to modified mevalonate kinases that are less sensitive to feedback inhibition, and to polynucleotides encoding them. The invention further pertains to vectors comprising these polynucleotides and host cells containing such vectors. The invention provides a process for producing the modified enzyme and for producing isoprenoid compounds using the modified enzymes.
1. A modified mevalonate kinase comprising an amino acid sequence having at least 95% amino acid sequence identity to the amino acid sequence of SEQ ID NO:1, wherein the amino acid sequence of the modified mevalonate kinase contains one mutation or combination of mutations selected from the group consisting of:
(1) combination of P55L and C117S mutations;
(2) F59S mutation;
(3) combination of N66K and I152M mutations;
(4) combination of K83E and S249P mutations;
(5) combination of H111N and K375N mutations;
(6) combination of L106P and S218P mutations; and
(7) combination of I142N, L158S, L231I and T367S mutations
wherein the one mutation or combination of mutations of (1) to (7) corresponds to the amino acid sequence of SEQ ID NO: 1 and wherein the modified mevalonate kinase has mevalonate kinase activity and exhibits a sensitivity to feedback inhibition which is reduced by at least 20% in comparison to the corresponding non-modified Saccharomyces cerevisiae mevalonate kinase as shown in SEQ ID NO: 1.