journal article Aug 07, 2017

JMJ27, an Arabidopsis H3K9 histone demethylase, modulates defense against Pseudomonas syringae and flowering time

The Plant Journal Vol. 91 No. 6 pp. 1015-1028 · Wiley
View at Publisher Save 10.1111/tpj.13623
Abstract
SummaryHistone methylation is known to dynamically regulate diverse developmental and physiological processes. Histone methyl marks are written by methyltransferases and erased by demethylases, and result in modification of chromatin structure to repress or activate transcription. However, little is known about how histone methylation may regulate defense mechanisms and flowering time in plants. Here we report characterization of JmjC DOMAIN‐CONTAINING PROTEIN 27 (JMJ27), an Arabidopsis JHDM2 (JmjC domain‐containing histone demethylase 2) family protein, which modulates defense against pathogens and flowering time. JMJ27 is a nuclear protein containing a zinc‐finger motif and a catalytic JmjC domain with conserved Fe(II) and α‐ketoglutarate binding sites, and displays H3K9me1/2 demethylase activity both in vitro and in vivo. JMJ27 is induced in response to virulent Pseudomonas syringae pathogens and is required for resistance against these pathogens. JMJ27 is a negative modulator of WRKY25 (a repressor of defense) and a positive modulator of several pathogenesis‐related (PR) proteins. Additionally, loss of JMJ27 function leads to early flowering. JMJ27 negatively modulates the major flowering regulator CONSTANS (CO) and positively modulates FLOWERING LOCUS C (FLC). Taken together, our results indicate that JMJ27 functions as a histone demethylase to modulate both physiological (defense) and developmental (flowering time) processes in Arabidopsis.
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Details
Published
Aug 07, 2017
Vol/Issue
91(6)
Pages
1015-1028
License
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Funding
National Science Foundation Award: IBN‐0313492
Syracuse University
Cite This Article
Aditya Dutta, Pratibha Choudhary, Julie Caruana, et al. (2017). JMJ27, an Arabidopsis H3K9 histone demethylase, modulates defense against Pseudomonas syringae and flowering time. The Plant Journal, 91(6), 1015-1028. https://doi.org/10.1111/tpj.13623
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