Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/1362
Título: Peroxynitrite-mediated oxidative modifications of myosin and implications on structure and function
Autor: Tiago, Teresa
Palma, Pedro
Gutiérrez-Merino, Carlos
Aureliano, M.
Palavras-chave: Myosin
Peroxynitrite
Data: 2010
Editora: Informa
Resumo: The peroxynitrite-induced functional impairment of myosin was studied in different reaction conditions, known to alter the oxidative chemistry of peroxynitrite, to better understand the molecular mechanisms of this interaction. It is shown that peroxynitrite is able to enhance the basal MgATPase activity up to 2-fold while inhibiting the actin-stimulated ATPase activity of myosin and that the extent of these functional alterations is dependent on the reaction medium. The observed changes in the stimulation of the MgATPase activity correlate with the extent of carbonyl formation in myosin. The enzyme inhibition is more potent in conditions where the effi ciency of tyrosine nitration and peroxynitrite reactivity towards sulphydryls are lower. Together with the observation that reversion of sulphydryl oxidation did not lead to the recovery of myosin functional and structural impairments, these results point out to the importance of protein carbonylation as a post-translational modifi cation in the peroxynitrite-induced myosin functional impairment.
Peer review: yes
URI: http://hdl.handle.net/10400.1/1362
ISSN: 1029-2470
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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