Mercury metalloproteomic profile in muscle tissue of Arapaima gigas from the Brazilian Amazon

Autor(es)

Bataglioli, Izabela da Cunha ; de Queiroz, Joao Vitor ; Souza Vieira, Jose Cavalcante ; Cavalline, Nubya Goncalves ; Braga, Camila Pereira ; Rabelo Buzalaf, Marilia Afonso ; Zara, Luis Fabricio ; Adamec, Jiri ; Padilha, Pedro de Magalhaes

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 194, n. 10, p. 11-pg., 2022-10-01.

Resumo

Metalloproteomics is an innovative methodology for identifying of protein-associated mercury. Thus, we analyzed the muscle proteome of Arapaima gigas (pirarucu), collected in the Madeira River of the Brazilian Amazon, to identify protein-associated mercury, with the aim of identifying possible mercury biomarkers in fish muscle tissue. After obtaining the protein pellet, we conducted two-dimensional electrophoresis (2D PAGE) to fractionate the muscle proteome. Total mercury in muscle tissue and protein pellets and mapping of mercury content in protein spots of the 2D PAGE gels was determined using graphite furnace atomic absorption spectrometry (GFAAS). The protein-associated mercury identification was performed using liquid chromatography coupled with sequence mass spectrometry (LC-MS/MS). Total mercury determinations by GFAAS indicated concentrations on the order of 153 +/- 1.90 mg kg(-1) and 142 +/- 1.50 mg kg(-1) (total precipitation of protein fraction) and 139 +/- 1.45 mg kg(-1) (fractional precipitation of protein fraction) in muscle tissue and protein pellets, respectively. Mercury concentrations in the range of 48 +/- 0.90 to 165 +/- 3.00 mg kg(-1) were found in twelve protein spots. Among the 2D PAGE protein spots, eleven Hg-binding proteins were identified using LC-MS/MS, which showed characteristics of mercury exposure biomarkers for important metabolic functions, such as five parvalbumin isoforms, triosephosphate isomerase, cofilin 2 (muscle), and fructose-bisphosphate aldolases. (AU)

• Processo FAPESP: 17/09466-3 - Elucidação de aspectos fisiológicos e funcionais de proteínas associadas ao mercúrio em pirarucu (Arapaima gigas)
• Beneficiário: Izabela da Cunha Bataglioli
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 16/19404-2 - Caracterização de biomarcadores de toxicidade de mercúrio em peixes da Bacia do Rio Madeira-Rondônia utilizando-se estratégias metaloproteômicas
• Beneficiário: Pedro de Magalhães Padilha
• Modalidade de apoio: Auxílio à Pesquisa - Regular