Polylysine induces a rapid Ca2+ release from sarcoplasmic reticulum vesicles by mediation of its binding to the foot protein☆
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2000, Journal of Biological ChemistryCitation Excerpt :Polylysine is the RyR-specific ligand that induces Ca2+ release at much lower concentrations than other release-inducing reagents such as caffeine and serves as an excellent agonist in terms of its specificity and potency (40). As seen, in the presence of DP4 the AC50 for polylysine decreased from 7 μm to 4 μm, and the inhibition by higher concentrations polylysine (9, 42) was also shifted to the left. Thus, DP4 produced common effects on the two different types of agonists: peptide A and polylysine.
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This work was supported by Grant AR-16922 from the National Institutes of Health and a grant from the Muscular Dystrophy Association of America.
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Permanent address: Laboratoire de Biophysique Moléculaire et Cellulaire, Centre d'Etudes Nucléaires, Grenoble 38041 France.