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Lessons on the critical interplay between zinc binding and protein structure and dynamics

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Blindauer, Claudia A. (2013) Lessons on the critical interplay between zinc binding and protein structure and dynamics. Journal of Inorganic Biochemistry, Volume 121 . pp. 145-155. doi:10.1016/j.jinorgbio.2013.01.005

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Official URL: http://dx.doi.org/10.1016/j.jinorgbio.2013.01.005

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Abstract

Zinc is one of the most important micronutrients for virtually all living organisms, and hence, it is important to understand the molecular mechanisms for its homeostasis. Besides proteins involved in transmembrane transport, both extra- and intracellular zinc-binding proteins play important roles in the respective metabolic networks. Important examples for extracellular zinc transporters are mammalian serum albumins, and for intracellular zinc handling, certain metallothioneins are of relevance. The availability of protein structures including relevant metal binding sites is a fundamental prerequisite to decipher the mechanisms that govern zinc binding dynamics in these proteins, but their determination can prove to be surprisingly challenging. Due to the spectroscopic silence of Zn2 +, combinations of biophysical techniques including electrospray ionisation mass spectrometry (ESI-MS) and multinuclear NMR, isothermal titration calorimetry (ITC) and extended X-ray absorption fine structure (EXAFS) spectroscopy, coupled with site-directed mutagenesis and molecular modelling have proven to be valuable approaches to understand not only the zinc-binding properties of metallothioneins and albumins, but also the influence of other physiologically relevant competing agents. These studies have demonstrated why the bacterial metallothionein SmtA contains a site inert towards exchange with Cd2 +, why the plant metallothionein EC from wheat is partially unfolded in the presence of Cd2 +, and how fatty acids impact on the zinc-binding ability of mammalian serum albumins.

Item Type: Journal Article
Divisions: Faculty of Science > Life Sciences (2010- )
Journal or Publication Title: Journal of Inorganic Biochemistry
Publisher: Elsevier Science Inc
ISSN: 0162-0134
Official Date: 2013
Dates:
DateEvent
2013Published
Volume: Volume 121
Page Range: pp. 145-155
DOI: 10.1016/j.jinorgbio.2013.01.005
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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