Abstract
‘Monovanadate’ containing a mixture of at least four different vanadate species and ‘decavanadate’ containing apparently only two vanadate species, mainly decameric species, inhibit myosin and actomyosin ATPase activities. The addition of myosin to ‘monovanadate’ and ‘decavanadate’ solutions promotes differential increases on the 51V NMR spectral linewidths of vanadate oligomers. The relative order of line broadening upon myosin addition, reflecting the interaction of the vanadate oligomers with the protein, was V10>V4>V1=1, whereas no changes were observed for monomeric vanadate species. It is concluded that decameric and tetrameric vanadate species interact quite potently with the protein and affect myosin as well actomyosin ATPase activities.
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