High molecular weight calcium binding protein in the microsome of scallop striated muscle - PubMed (original) (raw)
High molecular weight calcium binding protein in the microsome of scallop striated muscle
K Maruyama et al. J Biochem. 1984 Sep.
Free article
Abstract
In the microsome of scallop adductor striated muscle, 30K, 55K, 90K, and 360K proteins were detected as calcium binding proteins by 45Ca autoradiography on the transferred nitrocellulose membrane after sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS PAGE). The 360K protein was directly extracted with Triton X-100 from the whole homogenate of striated portion of scallop adductor muscle and purified through DEAE cellulose and hydroxyapatite column chromatography. This purified scallop high molecular weight calcium binding protein (SHCBP) showed a faster mobility in SDS PAGE in the presence of Ca2+ than in its absence. The decrease of tryptophan fluorescence had a half maximum near pCa 7 and was slightly co-operative with Mg2+. UV absorbance was slightly increased with Ca2+. The CD spectrum also changed with Mg2+ and Ca2+. These results reflect that this SHCBP binds calcium ions under near physiological conditions. SHCBP-like high molecular weight calcium binding proteins were also detected in the smooth muscle portion of adductor muscle and branchiae of scallop by 45Ca autoradiography, but not in liver. The adductor muscle of clam had a high molecular weight calcium binding protein whose molecular weight was a little smaller than that of SHCBP. The foot of turban shell had the same molecular weight calcium binding protein as SHCBP. Stains-all, a cationic carbocyanine dye, which has been reported to stain calcium binding proteins blue, stained SHCBP blue. The spectrum of SHCBP stained with Stains-all was very similar to that of calsequestrin. Although the function of SHCBP is still unknown, it might be expected to correspond to calsequestrin of vertebrate skeletal muscle, a calcium sequestering protein, in the sarcoplasmic reticulum.
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