Mutated fibroblast growth factor (FGF) 1 and methods of use
The present disclosure provides FGF1 mutant proteins, such as those having an N-terminal deletion, point mutation(s), or combinations thereof, which can reduce blood glucose in a mammal. Such mutant FGF1 proteins can be part of a chimeric protein that includes a β-Klotho-binding protein, an FGFR1c-binding protein, a β-Klotho-binding protein and a FGFR1c-binding protein, a C-terminal region from FGF19 or FGF21. In some examples, mutant FGF1 proteins have reduced mitogenic activity. Also provided are nucleic acid molecules that encode such proteins, and vectors and cells that include such nucleic acids. Methods of using the disclosed molecules to reduce blood glucose levels are also provided.
1. An isolated mutated mature fibroblast growth factor (FGF) 1 protein comprising at least 90% sequence identity to the amino acid sequence shown in SEQ ID NO: 234 wherein the isolated mutated mature FGF1 protein comprises a Y94V mutation, and wherein the amino acid numbering is based on SEQ ID NO: 5.
2. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein further comprises a mutation at K12, and wherein the amino acid numbering is based on SEQ ID NO: 5.
3. The isolated protein of claim 2 , wherein the mutation at K12 is K12V, and wherein the amino acid numbering is based on SEQ ID NO: 5.
4. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein further comprises a mutation at C117, and wherein the amino acid numbering is based on SEQ ID NO: 5.
5. The isolated protein of claim 4 , wherein the mutation at C117 is C117V, and wherein the amino acid numbering is based on SEQ ID NO: 5.
6. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein further comprises a mutation at K12 and C117, and wherein the amino acid numbering is based on SEQ ID NO: 5.
7. The isolated protein of claim 6 , wherein the mutation at K12 is K12V, the mutation at C117 is C117V, and amino acid numbering is based on SEQ ID NO: 5.
8. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein comprises at least 95% sequence identity to the amino acid sequence shown in SEQ ID NO: 234, wherein the isolated mutated mature FGF1 protein comprises a Y94V mutation, and wherein the amino acid numbering is based on SEQ ID NO: 5.
9. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein comprises at least 98% sequence identity to the amino acid sequence shown in SEQ ID NO: 234, wherein the isolated mutated mature FGF1 protein comprises a Y94V mutation, and wherein the amino acid numbering is based on SEQ ID NO: 5.
10. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein comprises at least 99% sequence identity to the amino acid sequence shown in SEQ ID NO: 234, wherein the isolated mutated mature FGF1 protein comprises a Y94V mutation, and wherein the amino acid numbering is based on SEQ ID NO: 5.
11. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein comprises the amino acid sequence shown in SEQ ID NO: 234.
12. The isolated protein of claim 1 , wherein the isolated mutated mature FGF1 protein consists of the amino acid sequence shown in SEQ ID NO: 234.
13. An isolated nucleic acid encoding the isolated protein of claim 1 .
14. A nucleic acid vector comprising the isolated nucleic acid of claim 13 .
15. A host cell comprising the nucleic acid vector of claim 14 .