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pubmed-article:18708665pubmed:abstractTextTo investigate the effect of phosphorylation on the interactions of phospholamban (PLB) with itself and its regulatory target, SERCA, we measured FRET from CFP-SERCA or CFP-PLB to YFP-PLB in live AAV-293 cells. Phosphorylation of PLB was mimicked by mutations S16E (PKA site) or S16E/T17E (PKA+CaMKII sites). FRET increased with protein concentration up to a maximum (FRET(max)) that was taken to represent the intrinsic FRET of the bound complex. The concentration dependence of FRET yielded dissociation constants (K(D)) for the PLB-PLB and PLB-SERCA interactions. PLB-PLB FRET data suggest pseudo-phosphorylation of PLB increased oligomerization of PLB but did not alter PLB pentamer quaternary structure. PLB-SERCA FRET experiments showed an apparent decrease in binding of PLB to SERCA and an increase in the apparent PLB-SERCA binding cooperativity. It is likely that these changes are secondary effects of increased oligomerization of PLB; a change in the inherent affinity of monomeric PLB for SERCA was not detected. In addition, PLB-SERCA complex FRET(max) was reduced by phosphomimetic mutations, suggesting the conformation of the regulatory complex is significantly altered by PLB phosphorylation.lld:pubmed
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pubmed-article:18708665pubmed:articleTitlePhosphomimetic mutations increase phospholamban oligomerization and alter the structure of its regulatory complex.lld:pubmed
pubmed-article:18708665pubmed:affiliationDepartment of Physiology, Loyola University Chicago, Maywood, Illinois 60153, USA.lld:pubmed
pubmed-article:18708665pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18708665pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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