Localization of site-specific probes on the Ca-ATPase of sarcoplasmic reticulum using fluorescence energy transfer.


Highly reactive sulfhydryls, previously labeled with an iodoacetamide spin label on the Ca-ATPase of sarcoplasmic reticulum, were labeled with the fluorescent probe, 5-(2-[iodoacetyl)amino)ethyl)aminonaphthalene-1-sulfonic acid (IAEDANS), without loss of enzymatic activity. We have selectively measured the apparent distance of the more reactive site… (More)


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