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Cited by 257

The DOI matches its Crossref record; 34 of the 34 references it cites were found in a registry or an index.

Vacuolar Na + /H + antiporter cation selectivity is regulated by calmodulin from within the vacuole in a Ca 2+ - and pH-dependent manner

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Yamaguchi, Toshio, Aharon, Gilad S., Sottosanto, Jordan B., Blumwald, Eduardo·2005·Proceedings of the National Academy of Sciences

Abstract

The selective movement of ions between intracellular compartments is fundamental for eukaryotes. Arabidopsis thaliana Na + /H + exchanger 1 (AtNHX1), the most abundant vacuolar Na + /H + antiporter in A. thaliana , has important roles affecting the maintenance of cellular pH, ion homeostasis, and the regulation of protein trafficking. Previously, we have shown that the AtNHX1 C-terminal hydrophilic region localized in the vacuolar lumen plays an important role in regulating the antiporter's activity. Here, we have identified A. thaliana calmodulin-like protein 15 (AtCaM15), which interacts with the AtNHX1 C terminus. When expressed in yeast, AtCaM15 is localized in the vacuolar lumen. The transient expression of AtCaM15 in Arabidopsis leaf protoplasts showed that AtCaM15 is present in the central vacuole. The binding of AtCaM15 to AtNHX1 was Ca 2+ - and pH-dependent and decreased with increasing pH values. Our results also show that the binding of AtCaM15 to AtNHX1 modified the Na + /K + selectivity of the antiporter, decreasing its Na + /H + exchange activity. Taken together, the presence of a vacuolar calmodulin-like protein acting on the vacuolar-localized AtNHX1 C terminus in a Ca 2+ - pH-dependent manner suggests the presence of signaling entities acting within the vacuole.

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Metadata

Authors
Yamaguchi, T., Aharon, G. S., Sottosanto, J. B., & Blumwald, E.
Venue
Proceedings of the National Academy of Sciences
Published
2005-10-25
Volume
102
Issue
44
Pages
16107-16112
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2134746340
Cited by
257
References
34
FWCI
12.24
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Vacuolar Na + /H + antiporter cation selectivity is regulated by calmodulin from within the vacuole in a Ca 2+ - and pH-dependent manner. https://app.cochat.ai/papers/10.1073/pnas.0504437102
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Yamaguchi, T., Aharon, G. S., Sottosanto, J. B., & Blumwald, E. (2005). Vacuolar Na + /H + antiporter cation selectivity is regulated by calmodulin from within the vacuole in a Ca 2+ - and pH-dependent manner. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0504437102

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