Abstract
The insulin-sensitizing effect of vanadium complexes has been linked to their ability to inhibit protein tyrosine phosphatases (PTPs). Considering that vanadium complexes may exchange in vivo with amino acids, forming in situ vanadium–amino acid complexes, we have synthesized and characterized an oxovanadium glutamate complex, Na2[V(IV)O(Glu)2(CH3OH)]H2O (1·H2O). The complex showed potent inhibition against four human PTPs (PTP1B, TCPTP, HePTP, and SHP-1) with IC50 in the 0.21–0.37 μM ranges. Fluorescence titration studies suggest that the complex binds to PTP1B with the formation of a 2:1 complex. Enzyme kinetics analysis using Lineweaver–Burk plots indicates a typical competitive inhibition mode.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant no. 20471033), the China Scholarship Council, the Province Natural Science Foundation of Shanxi Province of China (Grant nos. 20051013, 2010011011-2), the Overseas Returned Scholar Foundation of Shanxi Province of China in 2008 and the University of Massachusetts, Dartmouth, USA.
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Lu, L., Wang, S., Zhu, M. et al. Inhibition protein tyrosine phosphatases by an oxovanadium glutamate complex, Na2[VO(Glu)2(CH3OH)](Glu = glutamate). Biometals 23, 1139–1147 (2010). https://doi.org/10.1007/s10534-010-9363-8
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DOI: https://doi.org/10.1007/s10534-010-9363-8