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Calcium-Dependent Protein Kinases Regulate the Production of Reactive Oxygen Species by Potato NADPH Oxidase

Open access
Kobayashi, Michie, Ohura, Ikuko, Kawakita, Kazuhito, Yokota, Naohiko, Fujiwara, Masayuki, Shimamoto, Ko, Doke, Noriyuki, Yoshioka, Hirofumi·2007·The Plant Cell

Abstract

Reactive oxygen species (ROS) are implicated in plant innate immunity. NADPH oxidase (RBOH; for Respiratory Burst Oxidase Homolog) plays a central role in the oxidative burst, and EF-hand motifs in the N terminus of this protein suggest possible regulation by Ca2+. However, regulatory mechanisms are largely unknown. We identified Ser-82 and Ser-97 in the N terminus of potato (Solanum tuberosum) St RBOHB as potential phosphorylation sites. An anti-phosphopeptide antibody (pSer82) indicated that Ser-82 was phosphorylated by pathogen signals in planta. We cloned two potato calcium-dependent protein kinases, St CDPK4 and St CDPK5, and mass spectrometry analyses showed that these CDPKs phosphorylated only Ser-82 and Ser-97 in the N terminus of St RBOHB in a calcium-dependent manner. Ectopic expression of the constitutively active mutant of St CDPK5, St CDPK5VK, provoked ROS production in Nicotiana benthamiana leaves. The CDPK-mediated ROS production was disrupted by knockdown of Nb RBOHB in N. benthamiana. The loss of function was complemented by heterologous expression of wild-type potato St RBOHB but not by a mutant (S82A/S97A). Furthermore, the heterologous expression of St CDPK5VK phosphorylated Ser-82 of St RBOHB in N. benthamiana. These results suggest that St CDPK5 induces the phosphorylation of St RBOHB and regulates the oxidative burst.

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Metadata

Authors
Kobayashi, M., Ohura, I., Kawakita, K., Yokota, N., Fujiwara, M., Shimamoto, K., Doke, N., & Yoshioka, H.
Venue
The Plant Cell
Published
2007-03-01
Volume
19
Issue
3
Pages
1065-1080
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2117880739
Cited by
670
References
4
FWCI
33.88
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Calcium-Dependent Protein Kinases Regulate the Production of Reactive Oxygen Species by Potato NADPH Oxidase. https://app.cochat.ai/papers/10.1105/tpc.106.048884
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Kobayashi, M., Ohura, I., Kawakita, K., Yokota, N., Fujiwara, M., Shimamoto, K., Doke, N., & Yoshioka, H. (2007). Calcium-Dependent Protein Kinases Regulate the Production of Reactive Oxygen Species by Potato NADPH Oxidase. The Plant Cell. https://doi.org/10.1105/tpc.106.048884

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