Coupling of cell energetics with membrane metabolic sensing. Integrative signaling through creatine kinase phosphotransfer disrupted by M-CK gene knock-out.
SourceJournal of Biological Chemistry, 277, 27, (2002), pp. 24427-34
Article / Letter to editor
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Cell Biology (UMC)
Journal of Biological Chemistry
SubjectStudy of abnormal differentiation and transformation processes in heritable and acquired disorders with the use of cell and animal models; Bestudering van abnormale differentiatie en transformatieprocessen bij erfelijke of verworven aandoeningen m.b.v. cel- en diermodellen
Transduction of metabolic signals is essential in preserving cellular homeostasis. Yet, principles governing integration and synchronization of membrane metabolic sensors with cell metabolism remain elusive. Here, analysis of cellular nucleotide fluxes and nucleotide-dependent gating of the ATP-sensitive K+ (K(ATP)) channel, a prototypic metabolic sensor, revealed a diffusional barrier within the submembrane space, preventing direct reception of cytosolic signals. Creatine kinase phosphotransfer, captured by 18O-assisted 31P NMR, coordinated tightly with ATP turnover, reflecting the cellular energetic status. The dynamics of high energy phosphoryl transfer through the creatine kinase relay permitted a high fidelity transmission of energetic signals into the submembrane compartment synchronizing K(ATP) channel activity with cell metabolism. Knock-out of the creatine kinase M-CK gene disrupted signal delivery to K(ATP) channels and generated a cellular phenotype with increased electrical vulnerability. Thus, in the compartmentalized cell environment, phosphotransfer systems shunt diffusional barriers and secure regimented signal transduction integrating metabolic sensors with the cellular energetic network.
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