Tropomyosin isoform expression and phosphorylation in the human heart in health and disease

S.B. Marston, O. Copeland, A.E. Messer, Elyshia Mcnamara, Kristen Nowak, C.G. Zampronio, D.G. Ward

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We determined the isoforms of tropomyosin expressed and the level of tropomyosin phosphorylation in donor, end-stage failing and hypertrophic obstructive cardiomyopathy samples of human heart muscle. Western blots and isoform-specific antibodies showed that α-tropomyosin was the only significant isoform expressed and that tropomyosin was 25-30 % phosphorylated at serine 283. Mass spectrometry confirmed directly that α-tropomyosin made up over 95 % of tropomyosin but also indicated the presence of up to 4 % κ-tropomyosin and much smaller amounts of β-, γ- and smooth β-tropomyosin and about 26 % phosphorylation. Neither the isoform distribution nor the level of phosphorylation changed significantly in the pathological heart muscle samples. © 2013 Springer Science+Business Media Dordrecht.
Original languageEnglish
Pages (from-to)189-197
JournalJournal of Muscle Research and Cell Motility
Volume34
Issue number3-4
DOIs
Publication statusPublished - 2013

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