Abstract
Apart from amplifying the cytosolic Ca2+ signals generated by Ca2+ mobilization from the endoplasmic reticulum (ER), capacitative calcium entry (CCE) is essential for quick refilling of the ER, which is necessary for repeating Ca2+ signals. SERCA is the third element of CCE. It co-localizes with STIM1 and Orai1 at puncta where it is tightly coupled to plasma membrane store-operated Ca2+ channels (SOC). This allows an extremely efficient refilling of the ER stores with the Ca2+ entering through activated SOC. Whereas ER takes up most of the store-operated Ca2+ entry, mitochondria takes up a very little part. Low mitochondrial Ca2+ uptake can be explained by longer distance to SOC and lower Ca2+ affinity of mitochondrial uptake mechanisms.
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García-Sancho, J., Alonso, M.T. (2012). New Aspects of the Contribution of ER to SOCE Regulation. In: Groschner, K., Graier, W., Romanin, C. (eds) Store-operated Ca2+ entry (SOCE) pathways. Springer, Vienna. https://doi.org/10.1007/978-3-7091-0962-5_11
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DOI: https://doi.org/10.1007/978-3-7091-0962-5_11
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