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P(5A)-type ATPase Cta4p is essential for Ca2+ transport in the endoplasmic reticulum of Schizosaccharomyces pombe

, : P(5A)-type ATPase Cta4p is essential for Ca2+ transport in the endoplasmic reticulum of Schizosaccharomyces pombe. Plos One 6(11): E27843-E27843

This study establishes the role of P(5A)-type Cta4 ATPase in Ca(2+) sequestration in the endoplasmic reticulum by detecting an ATP-dependent, vanadate-sensitive and FCCP insensitive (45)Ca(2+)-transport in fission yeast membranes isolated by cellular fractionation. Specifically, the Ca(2+)-ATPase transport activity was decreased in ER membranes isolated from cells lacking a cta4(+) gene. Furthermore, a disruption of cta4(+) resulted in 6-fold increase of intracellular Ca(2+) levels, sensitivity towards accumulation of misfolded proteins in ER and ER stress, stimulation of the calcineurin phosphatase activity and vacuolar Ca(2+) pumping. These data provide compelling biochemical evidence for a P(5A)-type Cta4 ATPase as an essential component of Ca(2+) transport system and signaling network which regulate, in conjunction with calcineurin, the ER functionality in fission yeast.


PMID: 22132152

DOI: 10.1371/journal.pone.0027843

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