What question did this study set out to answer?

This research aims to identify a protein that activates myosin light chain kinase in a calcium-dependent manner.

Identification of an activator protein for myosin light chain kinase as the Ca2+-dependent modulator protein.

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Randomized trial identifies a Ca2+-dependent modulator for myosin light chain kinase, suggesting new insights into muscle contraction mechanisms.

This research aims to identify a protein that activates myosin light chain kinase in a calcium-dependent manner.
Identified modulator protein through quantitative cross-reactivity with brain and muscle proteins
Analyzed properties including sensitivity to calcium and UV absorption spectra
Used sodium dodecyl sulfate-polyacrylamide gel electrophoresis for mobility assessment
Modulator protein activates myosin light chain kinase in a calcium-regulated manner
Both proteins exhibit identical sensitivities to calcium and similar UV absorption characteristics
Implicated modulator protein and troponin-C in the contraction-relaxation cycle of skeletal muscle

Yagi et al. (1978) studied this question.

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Randomized trial identifies a Ca2+-dependent modulator for myosin light chain kinase, suggesting new insights into muscle contraction mechanisms.