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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Calmodulin and protein kinase C antagonists also inhibit the Ca2+-dependent protein protease, calpain I.

The calmodulin and C-kinase antagonists melittin, calmidazolium, N-(6-aminohexyl)-5-chloro-1-napthalenesulfonamide (W7), and trifluoperazine (TFP) also inhibit the activity of the human erythrocyte Ca2+-dependent protease, calpain I. W-5, the nonchlorinated derivative of W-7, was ineffective as an inhibitor of calpain I just as it is for calmodulin and protein kinase C. Dose response studies provided the following IC50 values: melittin, 2.6 microM; calmidazolium, 6.2 microM; trifluoperazine, 130 microM; W-7, 251 microM. These IC50 values indicate that the compounds have affinities 10 to 600 fold less for calpain I than for calmodulin; however, the affinities of the inhibitory compounds are comparable for calpain I and protein kinase C. Kinetic analysis indicates that the compounds are competitive inhibitors of calpain I with respect to substrate.[1]


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