6nfj

Structural highlights

Function

[KLOTB_HUMAN] Contributes to the transcriptional repression of cholesterol 7-alpha-hydroxylase (CYP7A1), the rate-limiting enzyme in bile acid synthesis. Probably inactive as a glycosidase. Increases the ability of FGFR1 and FGFR4 to bind FGF21 (By similarity). [FGF19_HUMAN] Involved in the suppression of bile acid biosynthesis through down-regulation of CYP7A1 expression, following positive regulation of the JNK and ERK1/2 cascades. Stimulates glucose uptake in adipocytes. Activity requires the presence of KLB and FGFR4.^{[1] [2] [3] [4]}

References

1. ↑ Holt JA, Luo G, Billin AN, Bisi J, McNeill YY, Kozarsky KF, Donahee M, Wang DY, Mansfield TA, Kliewer SA, Goodwin B, Jones SA. Definition of a novel growth factor-dependent signal cascade for the suppression of bile acid biosynthesis. Genes Dev. 2003 Jul 1;17(13):1581-91. Epub 2003 Jun 18. PMID:12815072 doi:10.1101/gad.1083503
2. ↑ Zhang X, Ibrahimi OA, Olsen SK, Umemori H, Mohammadi M, Ornitz DM. Receptor specificity of the fibroblast growth factor family. The complete mammalian FGF family. J Biol Chem. 2006 Jun 9;281(23):15694-700. Epub 2006 Apr 4. PMID:16597617 doi:10.1074/jbc.M601252200
3. ↑ Kurosu H, Choi M, Ogawa Y, Dickson AS, Goetz R, Eliseenkova AV, Mohammadi M, Rosenblatt KP, Kliewer SA, Kuro-o M. Tissue-specific expression of betaKlotho and fibroblast growth factor (FGF) receptor isoforms determines metabolic activity of FGF19 and FGF21. J Biol Chem. 2007 Sep 14;282(37):26687-95. Epub 2007 Jul 10. PMID:17623664 doi:10.1074/jbc.M704165200
4. ↑ Song KH, Li T, Owsley E, Strom S, Chiang JY. Bile acids activate fibroblast growth factor 19 signaling in human hepatocytes to inhibit cholesterol 7alpha-hydroxylase gene expression. Hepatology. 2009 Jan;49(1):297-305. doi: 10.1002/hep.22627. PMID:19085950 doi:http://dx.doi.org/10.1002/hep.22627