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Calponin is a thin filament-associated protein in smooth muscle that has been shown to bind actin, tropomyosin and calmodulin, and has been implicated to play a role in regulation of smooth muscle contractility. Using a centrifugation assay we found that calponin interacts with unphosphorylated filamentous smooth muscle myosin. We found that this calponin-myosin interaction is reversed by Ca 2...
Rabbit skeletal tropomyosin was labeled with the bifunctional photoactivatable crosslinker N-succinimidyl-6-(4'-azido-2'-nitrophenylamino)hexanoate. After irradiating the rigor complex composed of myosin subfragment-1, crosslinker-labeled tropomyosin, and F-actin, a crosslinked product was formed. This product was identified as a 1:1 adduct of tropomyosin and subfragment-1. This finding is in support...
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