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Issue 6, 2013
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Tris(2-pyridylmethyl)amine (TPA) as a membrane-permeable chelator for interception of biological mobile zinc

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Abstract

We report the characterization of tris(2-pyridylmethyl)amine (TPA) as a membrane-permeable zinc chelator for intercepting biological mobile zinc. Compared to N,N,N′,N′-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN), TPA chelates zinc with faster kinetics in cuvettes, live cells, and brain slices. TPA also is generally less toxic than TPEN in cell culture. Mechanistic analysis indicates that these improvements arise from both the electronic and steric properties of TPA including weaker metal-binding affinity, lower pKa, and smaller size. These results demonstrate that TPA chelation is a valuable addition to the methodologies available for investigating mobile zinc in biology.

Graphical abstract: Tris(2-pyridylmethyl)amine (TPA) as a membrane-permeable chelator for interception of biological mobile zinc

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Publication details

The article was received on 29 Mar 2013, accepted on 08 May 2013 and first published on 28 May 2013


Article type: Paper
DOI: 10.1039/C3MT00103B
Citation: Metallomics, 2013,5, 648-655
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    Tris(2-pyridylmethyl)amine (TPA) as a membrane-permeable chelator for interception of biological mobile zinc

    Z. Huang, X. Zhang, M. Bosch, S. J. Smith and S. J. Lippard, Metallomics, 2013, 5, 648
    DOI: 10.1039/C3MT00103B

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