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Biomphalaria glabrata metallothionein: lacking metal specificity of the protein and missing gene upregulation suggest metal sequestration by exchange instead of through selective binding


Niederwanger, Michael; Calatayud, Sara; Zerbe, Oliver; Atrian, Silvia; Albalat, Ricard; Capdevila, Merce; Palacios, Oscar; Dallinger, Reinhard (2017). Biomphalaria glabrata metallothionein: lacking metal specificity of the protein and missing gene upregulation suggest metal sequestration by exchange instead of through selective binding. International Journal of Molecular Sciences, 18:1457.

Abstract

The wild-type metallothionein (MT) of the freshwater snail Biomphalaria glabrata and a natural allelic mutant of it in which a lysine residue was replaced by an asparagine residue, were recombinantly expressed and analyzed for their metal-binding features with respect to Cd2+, Zn2+ and Cu+, applying spectroscopic and mass-spectrometric methods. In addition, the upregulation of the Biomphalaria glabrata MT gene was assessed by quantitative real-time detection PCR. The two recombinant proteins revealed to be very similar in most of their metal binding features. They lacked a clear metal-binding preference for any of the three metal ions assayed—which, to this degree, is clearly unprecedented in the world of Gastropoda MTs. There were, however, slight differences in copper-binding abilities between the two allelic variants. Overall, the missing metal specificity of the two recombinant MTs goes hand in hand with lacking upregulation of the respective MT gene. This suggests that in vivo, the Biomphalaria glabrata MT may be more important for metal replacement reactions through a constitutively abundant form, rather than for metal sequestration by high binding specificity. There are indications that the MT of Biomphalaria glabrata may share its unspecific features with MTs from other freshwater snails of the Hygrophila family.

Abstract

The wild-type metallothionein (MT) of the freshwater snail Biomphalaria glabrata and a natural allelic mutant of it in which a lysine residue was replaced by an asparagine residue, were recombinantly expressed and analyzed for their metal-binding features with respect to Cd2+, Zn2+ and Cu+, applying spectroscopic and mass-spectrometric methods. In addition, the upregulation of the Biomphalaria glabrata MT gene was assessed by quantitative real-time detection PCR. The two recombinant proteins revealed to be very similar in most of their metal binding features. They lacked a clear metal-binding preference for any of the three metal ions assayed—which, to this degree, is clearly unprecedented in the world of Gastropoda MTs. There were, however, slight differences in copper-binding abilities between the two allelic variants. Overall, the missing metal specificity of the two recombinant MTs goes hand in hand with lacking upregulation of the respective MT gene. This suggests that in vivo, the Biomphalaria glabrata MT may be more important for metal replacement reactions through a constitutively abundant form, rather than for metal sequestration by high binding specificity. There are indications that the MT of Biomphalaria glabrata may share its unspecific features with MTs from other freshwater snails of the Hygrophila family.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Uncontrolled Keywords:metallothinein Mass Spectrometery Metallation
Language:English
Date:2017
Deposited On:10 Jul 2017 12:55
Last Modified:18 Apr 2018 11:48
Publisher:MDPI Publishing
ISSN:1422-0067
Funders:Swiss National Science Foundation
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.3390/ijms18071457
Project Information:
  • : FunderSNSF
  • : Grant ID
  • : Project TitleSwiss National Science Foundation

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