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Original Article

Identification of a Spectroscopic Marker for the Ca2+-Binding Site of (Ca2+ + Mg2+)-ATPase of Sarcoplasmic Reticulum in the Occluded State

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Pages 61-67 | Accepted 27 Jun 1990, Published online: 09 Jul 2009
 

Abstract

The 7F05D0 excitation spectrum of Eu3+ bound to the high-affinity calcium sites of SR (Ca2 + + Mg2+)-ATPase diminishes upon occlusion of the Eu3+ into the interior of the enzyme. This “quenching” was found to be caused by the enzyme itself because trypsin digestion could relieve it. The level of digestion needed to relieve the quenching is beyond the level needed to eliminate occlusion; thus, the two processes are not related. Ca2+ is required during digestion to preserve the quenching, indicating close proximity between the Ca2+ site(s) and the quenching segment. Synthetic peptides were found that could mimic the native enzyme's ability to quench the Eu3+ fluorescence, although no native sequence has yet been identified that could emulate the enzyme

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