JBIC Journal of Biological Inorganic Chemistry

, Volume 16, Issue 7, pp 977–989

Metallothionein protein evolution: a miniassay


DOI: 10.1007/s00775-011-0798-3

Cite this article as:
Capdevila, M. & Atrian, S. J Biol Inorg Chem (2011) 16: 977. doi:10.1007/s00775-011-0798-3


Metallothionein (MT) evolution is one of the most obscure yet fascinating aspects of the study of these atypical metal-binding peptides. The different members of the extremely heterogeneous MT protein superfamily probably evolved through a web of duplication, functional differentiation, and/or convergence events leading to the current scenario, which is particularly hard to interpret in terms of molecular evolution. Difficulties in drawing straight evolutionary relationships are reflected in the lack of definite MT classification criteria. Presently, MTs are categorized either according to a pure taxonomic clustering or depending on their metal binding preferences and specificities. Extremely well documented MT revisions were recently published. But beyond classic approaches, this review of MT protein evolution will bring together new aspects that have seldom been discussed before. Hence, the emergence of life on our planet, since metal ion utilization is accepted to be at the root of the emergence of living organisms, and global trends that underlie structural and functional MT diversification, will be presented. Major efforts are currently being devoted to identifying rules for function-constrained MT evolution that may be applied to different groups of organisms.


Bacterial metallothionein Copper thionein Eukaryotic metallothionein Metallothionein Molecular evolution 



Billion years ago


Horse liver metallothionein



Copyright information

© SBIC 2011

Authors and Affiliations

  1. 1.Departament de Química, Facultat de CiènciesUniversitat Autònoma de BarcelonaCerdanyola del Vallès (Barcelona)Spain
  2. 2.Departament de Genètica, Facultat de BiologiaUniversitat de BarcelonaBarcelonaSpain

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