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Phosphorylation and dephosphorylation of calsequestrin on CK2-sensitive sites in heart

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Abstract

Calsequestrin (CSQ) concentrates in junctional sarcoplasmic reticulum (SR) where it functions in regulation of Ca2+ release. When purified from heart tissue, cardiac CSQ contains phosphate on a cluster of C-terminal serine residues, but little is known about the cellular site of kinase action, and the identity of the kinase remains uncertain. To determine basic features of the phosphorylation, we examined the reaction in canine heart preparations. CSQ phosphorylation was observed in [32P]metabolically-labeled heart cells after adenoviral overexpression, and its constitutive phosphorylation was limited to a CK2-sensitive C-terminal serine cluster. The CSQ kinase was oriented intralumenally, as was CSQ, inside membrane vesicles, such that exposure to each required detergent permeabilization. Yet even after detergent permeabilization, CSQ was phosphorylated much less efficiently by protein kinase CK2 in cardiac microsomes than was purified CSQ. Reduced phosphorylation was strongly dependent upon protein concentration, and phosphorylation time courses revealed a phosphatase activity that occurred constitutively as phosphorylated substrate accumulates. Evidence of selective dephosphorylation of CSQ glycoforms in heart homogenates was also seen by mass spectrometry analysis. Molecules with greater mannose content, a feature of early secretory pathway compartments, were more highly phosphorylated, while greater dephosphorylation was apparent in more distal compartments. Taken together, the analyses of CSQ phosphorylation in heart suggest that a constitutive process of phosphate turnover occurs for cardiac CSQ perhaps associated with its intracellular transport (Mol Cell Biochem 266: 209–217, 2004)

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  1. Program in Molecular and Cellular Cardiology, Department of Medicine, Wayne State University, Detroit, MI, USA

    Michal L. Ram, Arash Kiarash, James D. Marsh & Steven E. Cala

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Ram, M.L., Kiarash, A., Marsh, J.D. et al. Phosphorylation and dephosphorylation of calsequestrin on CK2-sensitive sites in heart. Mol Cell Biochem 266, 209–217 (2004). https://doi.org/10.1023/B:MCBI.0000049164.28580.56

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  • DOI: https://doi.org/10.1023/B:MCBI.0000049164.28580.56

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