What question did this study set out to answer?

This research aims to elucidate how N-ethylmaleimide (NEM) treatment affects the relaxation of myosin in actomyosin systems.

November 16, 1976Biochemistry

Mechanism of inhibition of relaxation by N-ethylmaleimide treatment of myosin

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This research aims to elucidate how N-ethylmaleimide (NEM) treatment affects the relaxation of myosin in actomyosin systems.
Investigated the effects of NEM treatment on heavy meromyosin (HMM) and acto-HMM interactions.
Analyzed the inability of NEM-treated complexes to dissociate in the presence of ATP.
Examined the impact of adding NEM-treated myosin to regulated actomyosin.
NEM treatment resulted in acto-HMM complexes that were not dissociated by ATP, indicating maintained rigor complexes.
NEM-treated myosin inhibited relaxation in native actomyosin systems when mixed.

Population

Actomyosin systems from rabbit skeletal muscle

Intervention

N-ethylmaleimide (NEM) treatment of myosin or heavy meromyosin (HMM)

Outcome

Inhibition of relaxation and dissociation of acto-HMM complexes by ATP

NEM treatment of myosin inhibits relaxation by maintaining rigor complexes with actin even in the presence of ATP.

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NEM-myosin may sustain rigor and impair relaxation; leaves open relevance to cardiac thin-filament regulation in vivo.

Pemrick et al. (1976) studied this question.

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