1. Calmodulin-like proteins were purified from the fruiting bodies of higher (basidiomycete) fungi and barley (Hordeum sp.) shoots. 2. These calmodulins have electrophoretic mobilities on 10% (w/v) polyacrylamide gels at pH 8.3 in the presence of 6 M-urea and at pH 8.3 in the presence of 0.1% sodium dodecyl sulphate similar to that of bovine brain calmodulin. They interacted with rabbit skeletal-muscle troponin I in the presence of Ca2+. 3. Barley and fungal calmodulins activated myosin light-chain kinase and phosphodiesterase in the presence of Ca2+, although the amounts needed were at least an order of magnitude greater than is required to produce the same effect with mammalian calmodulin. 4. Amino acid analyses indicated a number of differences from the mammalian protein, most notably the absence of trimethyl-lysine. 5. By using 125I-labelled calmodulin, a small amount of calmodulin-binding protein was detected in homogenates of barley and fungi. 6. No protein corresponding to calmodulin could be found in Escherichia coli or yeast, although a relatively high concentration of a protein that bound calmodulin was detected in E. coli by this technique.
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Research Article| March 01 1980
The preparation of calmodulins from barley (Hordeum sp.) and basidiomycete fungi
Biochem J (1980) 185 (3): 755–760.
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R J Grand, A C Nairn, S V Perry; The preparation of calmodulins from barley (Hordeum sp.) and basidiomycete fungi. Biochem J 1 March 1980; 185 (3): 755–760. doi: https://doi.org/10.1042/bj1850755
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