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Dual Nanomolar and Picomolar Zn(II) Binding Properties of Metallothionein
Abstract
Each of the seven Zn(II) ions in the Zn(3)S(9) and Zn(4)S(11) clusters of human metallothionein is in a tetrathiolate coordination environment. Yet analysis of Zn(II) association with thionein, the apoprotein, and analysis of Zn(II) dissociation from metallothionein using the fluorescent chelating agents FluoZin-3 and RhodZin-3 reveal at least three classes of sites with affinities that differ by 4 orders of magnitude. Four Zn(II) ions are bound with an apparent average log K of 11.8, and with the methods employed, their binding is indistinguishable. This binding property makes thionein a strong chelating agent. One Zn(II) ion is relatively weakly bound, with a log K of 7.7, making metallothionein a zinc donor in the absence of thionein. The binding data demonstrate that Zn(II) binds with at least four species: Zn(4)T, Zn(5)T, Zn(6)T, and Zn(7)T. Zn(5)T and Zn(6)T bind Zn(II) with a log K of approximately 10 and are the predominant species at micromolar concentrations of metallothionein in cells. Central to the function of the protein is the reactivity of its cysteine side chains in the absence and presence of Zn(II). Chelating agents, such as physiological ligands with moderate affinities for Zn(II), cause dissociation of Zn(II) ions from metallothionein at pH 7.4 (Zn(7)T <==> Zn(7-n)T + nZn(2+)), thereby affecting the reactivity of its thiols. Thus, the rate of thiol oxidation increases in the presence of Zn(II) acceptors but decreases if more free Zn(II) becomes available. Thionein is such an acceptor. It regulates the reactivity and availability of free Zn(II) from metallothionein. At thionein/metallothionein ratios > 0.75, free Zn(II) ions are below a pZn (-log[Zn(2+)](free)) of 11.8, and at ratios < 0.75, relatively large fluctuations of free Zn(II) ions are possible (pZn between 7 and 11). These chemical characteristics match cellular requirements for Zn(II) and suggest how the molecular structures and redox chemistries of metallothionein and thionein determine Zn(II) availability for biological processes.
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Citations
Cites
Femtomolar Sensitivity of Metalloregulatory Proteins Controlling Zinc Homeostasis
Outten, C. E., & O'Halloran, A. T. V. (2001) · Science · doi:10.1126/science.1060331 · Cited by 1,489
Cited by
The Essential Toxin: Impact of Zinc on Human Health
Plum, L. M., Rink, L., & Haase, H. (2010) · International Journal of Environmental Research and Public Health · doi:10.3390/ijerph7041342 · Cited by 1,577
Zinc biochemistry: From a single zinc enzyme to a key element of life
Maret, W. (2013) · Advances in Nutrition · doi:10.3945/an.112.003038 · Cited by 818
Self-citationThe biological inorganic chemistry of zinc ions
Krężel, A., & Maret, W. (2016) · Archives of Biochemistry and Biophysics · doi:10.1016/j.abb.2016.04.010 · Cited by 768
Self-citationBioinorganic chemistry of copper and zinc ions coordinated to amyloid-β peptide
Faller, P., & Hureau, C. (2009) · Dalton Trans. · doi:10.1039/b813398k · Cited by 530
Chen, B., Yu, P., Chan, W. N., Xie, F., Zhang, Y., Liang, L., Leung, K. T., Lo, K. W., Yu, J., Tse, G. M. K., et al. (2024) · Signal Transduction and Targeted Therapy · doi:10.1038/s41392-023-01679-y · Cited by 420
Metadata
- Authors
- Krȩżel, A., & Maret, W.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-08-14
- Volume
- 129
- Issue
- 35
- Pages
- 10911-10921
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1992240624
- Cited by
- 283
- References
- 1
- FWCI
- 18.02
- Type
- journal article
- Language
- en
- Open access
- closed
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