PIXE-electrophoresis shows starving collembolan reallocates protein-bound metals

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• 作者：Göran Bengtsson ; Jan Pallon ; Christina Nilsson ; Rita Triebskorn…
• 关键词：Collembola ; Metal ; Protein ; PIXE ; Electrophoresis ; Starvation ; Metallothionein ; Metalloprotein ; PAGE
• 刊名：Ecotoxicology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：25
• 期：1
• 页码：115-120
• 全文大小：605 KB
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• 作者单位：Göran Bengtsson (1)
  Jan Pallon (2)
  Christina Nilsson (2)
  Rita Triebskorn (3) (4)
  Heinz-R. Köhler (3)
  
  1. Department of Ecology, University of Lund, Sölvegatan 37, 22362, Lund, Sweden
  2. Department of Nuclear Physics, Lund Institute of Technology, Sölvegatan 14, 22362, Lund, Sweden
  3. Animal Physiological Ecology, Institute of Evolution and Ecology, University of Tübingen, Auf der Morgenstelle 5, 72076, Tübingen, Germany
  4. Transfer Center Ecotoxicology and Ecophysiology, Blumenstrasse 13, 72108, Rottenburg, Germany
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-3017

文摘

One of multiple functions of metalloproteins is to provide detoxification to excess metal levels in organisms. Here we address the induction and persistence of a range of low to high molecular weight copper- and zinc binding proteins in the collembolan species Tetrodontophora bielanensis exposed to copper- and zinc-enriched food, followed by a period of recovery from metal exposure, in absence and presence of food. After 10 days of feeding copper and zinc contaminated yeast, specimens were either moved to ample of leaf litter material from their woodland stand of origin or starved (no food offered). The molecular weight distribution of metal binding proteins was determined by native polyacryl gel electrophoresis. One gel was stained with Comassie brilliant blue and a duplicate gel dried and scanned for the amount of copper and zinc by particle-induced X-ray emission. Specimens exposed to copper and recovered from it with ample of food had copper bound to two groups of rather low molecular weight proteins (40–50 kDa) and two of intermediate size (70–80 kDa). Most zinc in specimens from the woodland stand was bound to two large proteins of about 104 and 106 kDa. The same proteins were holding some zinc in metal-exposed specimens, but most zinc was found in proteins <40 kDa in size. Specimens recovered from metal exposure in presence of ample of food had the same distribution pattern of zinc binding proteins, whereas starved specimens had zinc as well as copper mainly bound to two proteins of 8 and 10 kDa in size. Thus, the induction and distribution of copper- and zinc-binding proteins depend on exposure conditions, and the presence of low molecular weight binding proteins, characteristic of metallothioneins, was mainly limited to starving conditions.