A novel regulatory protein that affects the functions of caldesmon and myosin light chain kinase. |
| |
Authors: | Y Lin R Ishikawa K Kohama |
| |
Institution: | Department of Pharmacology, Gunma University, School of Medicine, Japan. |
| |
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. |
| |
Keywords: | |
|
|