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Oxford University Press, Metallomics, 6(5), p. 648, 2013

DOI: 10.1039/c3mt00103b

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

Journal article published in 2013 by Zhen Huang, Xiao-An Zhang, Miquel Bosch ORCID, Sarah J. Smith, Stephen J. Lippard
This paper is available in a repository.
This paper is available in a repository.

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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.