The in vitro motility activity of β-cardiac myosin depends on the nature of the β-myosin heavy chain gene mutation in hypertrophic cardiomyopathy

Springer Science and Business Media LLC - Tập 18 Số 3 - Trang 275-283 - 1997
CUDA, GIOVANNI1, FANANAPAZIR, LAMEH2, EPSTEIN, NEAL D.2, SELLERS, JAMES R.1
1Laboratory of Molecular Cardiology National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, USA
2Cardiology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, USA

Tóm tắt

Several mutations in the β-myosin heavy chain gene cause hypertrophic cardiomyopathy. This study investigates (1) the in vitro velocities of translocation of fluorescently-labelled actin by β-myosin purified from soleus muscle of 30 hypertrophic cardiomyopathy patients with seven distinct β-myosin heavy chain gene mutations: Thr124Ile, Tyr162Cys, Gly256Glu, Arg403Gln, Val606Met, Arg870His, and Leu908Val mutations; and (2) motility activity of β-myosin purified from cardiac and soleus muscle biopsies in the same patients. The velocity of translocation of actin by β-myosin purified from soleus or cardiac muscle of 22 normal controls was 0.48 ± 0.09 μm s−1. By comparison, the motility activity was reduced in all 30 patients with β-myosin heavy chain gene mutations (range, 0.112 ± 0.041 to 0.292 ± 0.066 μm s−1). Notably, the Tyr162Cys and Arg403Gln mutations demonstrated significantly lower actin sliding velocities: 0.123 ± 0.044, and 0.112 ± 0.041 μm s−1, respectively. β-myosin purified from soleus muscle from four patients with the Arg403Gln mutation had a similar actomyosin motility activity compared to β-myosin purified from their cardiac biopsies (0.127 ± 0.045 μm s−1 versus 0.119 ± 0.068 μm s−1, respectively). Since these seven mutations lie in several distinct functional domains, it is likely that the mechanisms of their inhibitions of motility are different

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