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Distribution of selected essential (Co, Cu, Fe, Mn, Mo, Se, Zn) and nonessential (Cd, Pb) trace elements among protein fractions from hepatic cytosol of European chub (Squalius cephalus L.)

Krasnići, Nesrete; Dragun, Zrinka; Erk, Marijana; Raspor, Biserka (2013) Distribution of selected essential (Co, Cu, Fe, Mn, Mo, Se, Zn) and nonessential (Cd, Pb) trace elements among protein fractions from hepatic cytosol of European chub (Squalius cephalus L.). Environmental Science and Pollution Research, 20 (4). pp. 2340-2351. ISSN 0944-1344

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Abstract

Association of selected essential (Co, Cu, Fe, Mn, Mo, Se, Zn) and nonessential (Cd, Pb) trace elements with cytosolic proteins of different molecular masses was described for the liver of European chub (Squalius cephalus) from weakly contaminated Sutla River in Croatia. Principal aim was to establish basic trace element distributions among protein fractions characteristic for the fish living in the conditions of low metal exposure in the water. The fractionation of chub hepatic cytosols was carried out by size exclusion high performance liquid chromatography (SE-HPLC ; Superdex™ 200 10/300 GL column), and measurements were performed by high resolution inductively coupled plasma mass spectrometry (HR ICP-MS). Elution profiles of essential elements were mostly characterized by broad peaks covering wide range of molecular masses, as a sign of incorporation of essential elements in various proteins within hepatic cytosol. Exceptions were Cu and Fe, with elution profiles characterized by sharp, narrow peaks indicating their probable association with specific proteins, metallothionein (MT) and ferritin, respectively. The main feature of the elution profile of nonessential metal Cd was also single sharp, narrow peak, coinciding with MT elution time, and indicating almost complete Cd detoxification by MT under the conditions of weak metal exposure in the water (dissolved Cd concentration 0.3 g L-1). Contrary, nonessential metal Pb was observed to bind to wide spectrum of proteins, mostly of medium molecular masses (30-100 kDa), after exposure to dissolved Pb concentration of ~1 g L-1. The obtained information within this study presents the starting point for identification and characterization of specific metal/metalloid-binding proteins in chub hepatic cytosol, which could be further on used as markers of metal/metalloid exposure or effect on fish.

Item Type: Article
Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/s11356-012-1105-8
Uncontrolled Keywords: European chub; hepatic cytosol; trace elements; proteins; SE-HPLC; HR ICP-MS
Subjects: NATURAL SCIENCES > Chemistry > Analytic Chemistry
NATURAL SCIENCES > Biology
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions: Division for Marine and Enviromental Research
Projects:
Project titleProject leaderProject codeProject type
Stanične promjene u vodnih organizama pobuđene metalimaMarijana Erk098-0982934-2721MZOS
Depositing User: Zrinka Dragun
Date Deposited: 18 May 2015 09:57
Last Modified: 18 May 2015 13:06
URI: http://fulir.irb.hr/id/eprint/1879
DOI: 10.1007/s11356-012-1105-8

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