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http://dx.doi.org/10.14348/molcells.2014.0224

Characterization of a Novel DWD Protein that Participates in Heat Stress Response in Arabidopsis  

Kim, Soon-Hee (Department of Biology Education, Pusan National University)
Lee, Joon-Hyun (Department of Biology Education, Pusan National University)
Seo, Kyoung-In (Department of Biology Education, Pusan National University)
Ryu, Boyeong (Department of Biology Education, Pusan National University)
Sung, Yongju (Department of Biology Education, Pusan National University)
Chung, Taijoon (Department of Biological Sciences, Pusan National University)
Deng, Xing Wang (Department of Molecular, Cellular and Developmental Biology, Yale University)
Lee, Jae-Hoon (Department of Biology Education, Pusan National University)
Publication Information
Molecules and Cells / v.37, no.11, 2014 , pp. 833-840 More about this Journal
Abstract
Cullin4-RING ubiquitin ligase (CRL4) is a family of multi-subunit E3 ligases. To investigate the possible involvement of CRL4 in heat stress response, we screened T-DNA insertion mutants of putative CRL4 substrate receptors that exhibited altered patterns in response to heat stress. One of the mutants exhibited heat stress tolerance and was named heat stress tolerant DWD1 (htd1). Introduction of HTD1 gene into htd1-1 led to recovery of heat sensitivity to the wild type level, confirming that the decrease of HTD1 transcripts resulted in heat tolerance. Therefore, HTD1 plays a negative role in thermotolerance in Arabidopsis. Additionally, HTD1 directly interacted with DDB1a in yeast two-hybrid assays and associated with DDB1b in vivo, supporting that it could be a part of a CRL4 complex. Various heat-inducible genes such as HSP14.7, HSP21, At2g03020 and WRKY28 were hyper-induced in htd1-1, indicating that HTD1 could function as a negative regulator for the expression of such genes and that these genes might contribute to thermotolerance of htd1-1, at least in part. HTD1 was associated with HSP90-1, a crucial regulator of thermotolerance, in vivo, even though the decrease of HTD1 did not affect the accumulation pattern of HSP90-1 in Arabidopsis. These findings indicate that a negative role of HTD1 in thermotolerance might be achieved through its association with HSP90-1, possibly by disturbing the action of HSP90-1, not by the degradation of HSP90-1. This study will serve as an important step toward understanding of the functional connection between CRL4-mediated processes and plant heat stress signaling.
Keywords
Arabidopsis; CRL4; heat stress; HSP; HTD1;
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