2004 - Calcium transport by sarcoplasmic reticulum Ca-ATPase can be investigated on a solid-supported membrane

Icon N1   SURFE²R-technology (custom-built system) publication in Bioelectrochemistry (2004)

Bartolommei G., Buoninsegni F.T., Moncelli M.R.

Bioelectrochemistry (2004) 63(1-2):157-160


Sarcoplasmic reticulum (SR) native vesicles incorporating Ca-ATPase are adsorbed on a solid-supported lipid membrane (SSM). Upon adsorption, the ion pumps are chemically activated by concentration jumps of ATP and the capacitive current transients generated by SR Ca-ATPase are measured under potentiostatic conditions. The Michaelis-Menten constant, KM, for ATP is evaluated by varying the concentration of ATP in the activating solution. This preliminary result shows that ion transport by SR Ca-ATPase can be suitably investigated by a technique based on concentration jumps on an SSM.

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