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. 1997 Aug;114(4):1511–1521. doi: 10.1104/pp.114.4.1511

Inositol 1,4,5-trisphosphate-sensitive Ca2+ release across nonvacuolar membranes in cauliflower.

S R Muir 1, D Sanders 1
PMCID: PMC158445  PMID: 9276959

Abstract

Previous studies have indicated that the vacuole represents the major inositol 1,4,5-trisphosphate (InsP3)-mobilizable Ca2+ pool in higher plants. This findings is in contrast to animal cells, in which the endoplasmic reticulum and plasma membrane constitute the dominant InsP3-sensitive membranes. We used membrane vesicles prepared from cauliflower (Brassica oleracae L.) inflorescences that were separated on continuous sucrose gradients to demonstrate that cauliflower possesses at least two distinct membrane populations that are sensitive to InsP3. One of these membrane populations in nonvacuolar in origin and relies upon a Ca(2+)-ATPase to accumulate Ca2+. In addition, we have shown that two polyclonal antibodies, raised against peptides corresponding to the animal type 1 InsP3 receptor, recognize immunologically related proteins in cauliflower, and that the distribution of immunoreactive proteins on a linear sucrose gradient reinforces the notion that cauliflower contains more than one membrane subtype that is sensitive to InsP3. To our knowledge, this is the first report describing an InsP3-sensitive Ca2+ store other than the vacuole in higher plant cells.

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Selected References

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