Interaction between IGFBP-5 and TNFR1

다국어 초록 (Multilingual Abstract)

Insulin-like growth factor binding protein 5 (IGFBP-5) plays an important role in controlling cell survival, differentiation and apoptosis. Apoptosis can be induced by an extrinsic pathway involving the ligand-mediated activation of death receptors such as tumor necrosis factor receptor 1 (TNFR1). To determine whether IGFBP-5 and TNFR1 interact as members of the same apoptosis pathway, recombinant IGFBP-5 and TNFR1 were isolated. The expression and purification of the full-length TNFR1 and truncated IGFBP-5 proteins were successfully performed in E. coli. The binding of both IGFBP-5 and TNFR1 proteins was detected by surface plasmon resonance spectroscopy (BIAcore),fluorescence measurement, electron microscopy, and size-exclusion column (SEC) chromatography. IGFBP-5 indeed binds to TNFR1 with an apparent KD of 9 nM. After measuring the fluorescence emission spectra of purified IGFBP-5and TNFR1, it was found that the tight interaction of these proteins is accompanied by significant conformational changes of one or both. These results indicate that IGFBP-5 acts potently as a novel ligand for TNFR1.

참고문헌 (Reference)

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