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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Presenilin 2 interacts with sorcin, a modulator of the ryanodine receptor.

Perturbed Ca(2+) homeostasis is a common molecular consequence of familial Alzheimer's disease-linked presenilin mutations. We report here the molecular interaction of the large hydrophilic loop region of presenilin 2 (PS2) with sorcin, a penta-EF-hand Ca(2+)-binding protein that serves as a modulator of the ryanodine receptor intracellular Ca(2+) channel. The association of endogenous sorcin and PS2 was demonstrated in cultured cells and human brain tissues. Membrane-associated sorcin and a subset of the functional PS2 complexes were co-localized to a novel subcellular fraction that is distinctively positive for calcineurin B. Sorcin was found to interact with PS2 endoproteolytic fragments but not full-length PS2, and the sorcin/PS2 interaction was greatly enhanced by treatment with the Ca(2+) ionophore A23187. Our findings reveal a molecular link between PS2 and intracellular Ca(2+) channels (i.e. ryanodine receptor) and substantiate normal and/or pathological roles of PS2 in intracellular Ca(2+) homeostasis.[1]

References

  1. Presenilin 2 interacts with sorcin, a modulator of the ryanodine receptor. Pack-Chung, E., Meyers, M.B., Pettingell, W.P., Moir, R.D., Brownawell, A.M., Cheng, I., Tanzi, R.E., Kim, T.W. J. Biol. Chem. (2000) [Pubmed]
 
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