[IIGB_All] Special seminar on cold tolerance in plants

[Meng Chen]

Dear Colleagues,

Prof. Dae-Jin Yun from Konkuk University (Korea) will visit UCR and give a special seminar on plant cold tolerance at 10 AM this Wednesday.  The following is the seminar information. Please let me know if you wish to meet with Prof. Yun after his seminar. 

Title: Epigenetic regulation of cold tolerance in plants
Speaker: Prof. Dae-Jin Yun
Time: 10 AM, Jan 12 (Wednesday)
Synopsis:
Switching from repressed to active status in chromatin regulation is part of the critical responses that plants deploy to survive in an ever-changing environment. We found that HOS15, a WD40-repeat protein, is a substrate receptor of the CULLIN4-based CLR4 ubiquitin E3 ligase complex, which epigenetically regulates cold tolerance by degrading HISTONE DEACETYLASE2C (HD2C) to switch from repressive to permissive chromatin structure in response to cold stress. To identify the protein complexes that function in conjunction with HOS15, we performed FLAG-tag affinity purification using transgenic Arabidopsis plants expressing HOS15-FLAG and isolated many HOS15-interacting proteins. Among them, we analyzed the function of POWERDRESS (PWR) in detail. PWR loss-of-function plants (pwr) showed lower expression of cold-regulated (COR) genes and sensitivity to freezing. PWR interacts with HD2C through HOS15, and cold-induced HD2C degradation by HOS15 is diminished in the pwr mutant. The association of HOS15 and HD2C to promoters of cold-responsive COR genes was dependent on PWR. Consistent with these observations, the high acetylation levels of histone H3 by cold-induced and HOS15-mediated HD2C degradation were significantly reduced in pwr under cold stress. PWR also interacts with C-repeat element-binding factor transcription factors to modulate their cold-induced binding to the promoter of COR genes. Collectively, our data signify that the PWR-HOS15-HD2C histone-modifying complex regulates the expression of COR genes and the freezing tolerance of plants.

Zoom link:

Topic: Special Seminar by Prof. Dae-Jin Yan
Time: Jan 12, 2022 10:00 AM Pacific Time (US and Canada)

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Best,

Meng

-- 
Meng Chen
Department of Botany & Plant Sciences
University of California, Riverside 
Website: http://www.plasticgenome.org/

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