Different roles of N- and C- termini in the functional activity of FGF21

Journal of Cellular Physiology
Radmila MicanovicAlexei Kharitonenkov

Abstract

Fibroblast growth factor 21 is a member of endocrine FGFs subfamily, along with FGF19 and FGF23. It is emerging as a novel regulator with beneficial effects on a variety of metabolic parameters, including glucose and lipid control. FGF21 activity depends on membrane protein betaKlotho that physically complexes with various FGF receptors, thus conferring them the ability to bind FGF21 and activate downstream signaling pathways. FGF21, like other FGFs, folds to a beta-trefoil-like core region, with disordered N- and C-termini. In order to investigate their role in the activity of FGF21, we have constructed a series of deletion mutants and tested them for their ability to (1) bind betaKlotho, analyzed by surface plasmon resonance spectroscopy (2) signal through MAPK phosphorylation and inhibit apoptosis in 3T3-L1/betaKlotho fibroblasts (3) stimulate GLUT1 mRNA upregulation and glucose uptake in 3T3-L1 adipocytes. Binding studies with betaKlotho revealed that the interaction with the co-receptor involves the C-terminus, as progressive removal of amino acids from the carboxy end decreased affinity for betaKlotho. By contrast, removal of up to 17 amino acids from the N-terminus had no effect on the interaction with betaKlotho. Termin...Continue Reading

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