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  • Title: A novel regulatory protein that affects the functions of caldesmon and myosin light chain kinase.
    Author: Lin Y, Ishikawa R, Kohama K.
    Journal: Biochem Biophys Res Commun; 1992 May 15; 184(3):1212-8. PubMed ID: 1590784.
    Abstract:
    A caldesmon (CaD)-binding protein of about 65 kDa (by SDS-PAGE) was purified from smooth muscle of chicken gizzard. The 65-kDa protein prevented the inhibitory effect of CaD on the ATP-dependent interaction between actin and myosin. Unlike the case with calmodulin (CaM), Ca2+ was not required for this effect. As reported in the preceding communication, myosin light chain kinase (MLCK), another well characterized protein that binds CaM, has CaD-like activity that modulates the interaction by binding to actin. The 65-kDa protein was also effective in relieving the modulation, while leaving unaffected the kinase activity that phosphorylates the light chain of smooth muscle myosin.
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