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- W2070536183 abstract "Phosphorylation of myosin binding protein C (MyBP-C) was investigated in intraventricular septum samples taken from patients with hypertrophic cardiomyopathy undergoing surgical septal myectomy. These samples were compared with donor heart muscle, as a well-characterised control tissue, and with end-stage failing heart muscle. MyBP-C was partly purified from myofibrils using a modification of the phosphate-EDTA extraction of Hartzell and Glass. MyBP-C was separated by SDS-PAGE and stained for phosphoproteins using Pro-Q Diamond followed by total protein staining using Coomassie Blue. Relative phosphorylation level was determined from the ratio of Pro-Q Diamond to Coomassie Blue staining of MyBP-C bands as measured by densitometry. We compared 9 myectomy samples and 9 failing heart samples with 9 donor samples. MyBP-C phosphorylation in pathological muscle was lower than in donor (myectomy 40±2% of donor, P<0.0001; failing 45±3% of donor, P<0.0001). 6 myectomy samples were identified with MYBPC3 mutations, one with MYH7 mutation and two remained unknown, but there was no correlation between MYBPC3 mutation and MyBP-C phosphorylation level. In order to determine the number of phosphorylated sites in human cardiac MyBP-C samples, we phosphorylated the recombinant MyBP-C fragment, C0–C2 (1–453) with PKA using γ32P-ATP up to 3.5 mol Pi/mol C0–C2. This measurement of phosphorylation was used to calibrate measurements of phosphorylation in SDS-PAGE using Pro-Q Diamond stain. The level of phosphorylation in donor heart MyBP-C was calculated to be 4.6±0.6 mol Pi/mol and 2.0±0.3 mol Pi/mol in myectomy samples. We conclude that MyBP-C is a highly phosphorylated protein in vivo and that diminished MyBP-C phosphorylation is a feature of both end-stage heart failure and hypertrophic cardiomyopathy." @default.
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- W2070536183 date "2008-08-01" @default.
- W2070536183 modified "2023-10-18" @default.
- W2070536183 title "Myosin binding protein C phosphorylation in normal, hypertrophic and failing human heart muscle" @default.
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- W2070536183 doi "https://doi.org/10.1016/j.yjmcc.2008.05.020" @default.
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