Key result
Smooth muscle myosin II exhibits relatively loose coupling between catalytic and actin-binding sites, leading to three discrete actin-associated ADP states, unlike fast myosins.
The discovery of a second strongly bound actomyosin ADP state in smooth muscle provides a mechanistic explanation for its prolonged force-generating capability compared to fast skeletal muscle.
No takes yet. Share an insight, caveat, or question.
Distinguishes smooth from fast myosin kinetics; leaves open implications for vascular force maintenance in cardiovascular disease.
Rosenfeld et al. (2000) studied this question. Smooth muscle myosin subfragment 1 interaction with ADP vs. Fast skeletal muscle myosin II / Dictyostelium myosin II was evaluated on Actomyosin ADP states and coupling between catalytic and actin-binding sites. Smooth muscle myosin II exhibits relatively loose coupling between catalytic and actin-binding sites, leading to three discrete actin-associated ADP states, unlike fast myosins.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: