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. 1986 Feb;49(2):411–424. doi: 10.1016/S0006-3495(86)83651-7

The reaction of N-(1-pyrene)maleimide with sarcoplasmic reticulum.

S Papp, G Kracke, N Joshi, A Martonosi
PMCID: PMC1329481  PMID: 2937461

Abstract

The excimer fluorescence of the adduct of N-(1-pyrene)maleimide (PMI) with the Ca2+-ATPase was proposed as a probe of ATPase-ATPase interactions in sarcoplasmic reticulum (Lüdi and Hasselbach, Eur. J. Biochem., 1983, 130:5-8). We tested this proposition by analyzing the spectral properties and stoichiometry of the adducts of pyrenemaleimide with sarcoplasmic reticulum and with dithiothreitol and by comparing the effects of various detergents on the excimer fluorescence of the two adducts, with their influence on the sedimentation characteristics, ATPase activity, and light scattering of the pyrenemaleimide-labeled sarcoplasmic reticulum. These studies indicate that pyrenemaleimide reacts nearly randomly with several SH groups on the Ca2+-ATPase, and suggest that the observed excimer fluorescence of pyrenemaleimide-labeled sarcoplasmic reticulum may reflect intramolecular phenomena rather than ATPase-ATPase interactions. Further work is required to establish the relative contribution of intra- and intermolecular mechanisms to the excimer fluorescence.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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