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The protein whose removal enables myosin to bind actin in smooth muscle is
Options
(a) tropomyosin
(b) caldesmon
(c) myosin light chain kinase
(d) calmodulin
Correct Answer:
calmodulin
Explanation:
The protein caldesmon, originally isolated from smooth muscle tissue where it is the most abundant calmodulin-binding protein, has since been shown to have a wide distribution in actin- and myosin- containing cells where it is localized in sub-cellular structures concerned with motility, shape changes and exo- or endo-cytosis. Caldesmon is believed to be an actin- regulatory protein, and binds with high affinity to actin or actin-tropomyosin. Caldesmon inhibits the activation by actin-tropomyosin of myosin
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Topics: Locomotion and Movement
(106)
Subject: Biology
(4253)
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