Key result
Nebulin fragments from the N-terminal half inhibit actomyosin ATPase activity and actin sliding velocity, an effect that is reversed by calmodulin in a calcium-dependent manner.
Population
Cloned human nebulin fragments, actin, myosin, and calmodulin (in vitro skeletal muscle model)
Comparison
Addition of calmodulin and calcium vs Absence of calmodulin and calcium
Design
Preclinical
Authors
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Nebulin fragment binding data are hypothesis-generating; leaves open any cardiac muscle relevance without practice implications.
Nebulin fragments interact with actin and myosin in a calcium/calmodulin-dependent manner, suggesting a regulatory role in skeletal muscle contraction analogous to caldesmon in smooth muscle.
Root et al. (1994) studied this question. Human nebulin fragments was evaluated on Actomyosin ATPase activity and sliding velocity of actin over myosin. Nebulin fragments from the N-terminal half inhibit actomyosin ATPase activity and actin sliding velocity, an effect that is reversed by calmodulin in a calcium-dependent manner.
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