Molecular mechanism of inhibition of nonclassical FGF-1 export
by Dakshinamurthy, Rajalingam; Kumar, Thallapuranam Krishnaswamy Suresh; Soldi, Raffaella; Graziani, Irene; Prudovsky, Igor; Yu, C.
Fibroblast growth factor (FGF-1) lacks a signal sequence and is exported by an unconventional release mechanism. The nonclassical export of FGF-1 has been shown to be inhibited by an anti-allergic and anti-inflammatory drug, amlexanox (AMX). We investigate the molecular mechanism(s) underlying the inhibitory action of AMX on the release of FGF-1, using a variety of biophysical techniques including multidimensional NMR spectroscopy. AMX binds to FGF-1 and enhances its conformational stability. AMX binds to locations close to Cys30 and sterically blocks Cu2+-induced oxidation, leading to the formation of the homodimer of FGF-1. AMX-induced inhibition of the formation of the FGF-1 homodimer is observed both under cell-free conditions and in living cells. Results of this study suggest a novel approach for the design of drugs against FGF-1-mediated disorders.
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- 1520-4995; 0006-2960