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The C-terminal domains of Arabidopsis GL3/EGL3/TT8 interact with JAZ proteins and mediate dimeric interactions.

ABSTRACT: The phytohormone jasmonates (JAs) regulate plant development, growth, secondary metabolism, and defense responses. JAs act through CORONATINE INSENSITIVE1 (COI1) to induce the degradation of JA ZIM-domain (JAZ) proteins, and activate JAZ-repressed transcription factors to regulate plant response. We previously showed that the basic helix-loop-helix (bHLH) and MYB members of the WD-repeat/bHLH/MYB complex interacted with JAZs and mediated JA-induced anthocyanin accumulation and trichome initiation. In this study, we showed that the C-terminal domain of the bHLH members (GLABRA3 [GL3], ENHANCER OF GLABRA3 [EGL3] and TRANSPARENT TESTA8 [TT8]) interacted with JAZs in yeast and plant, and mediated dimerizations between the bHLH members. Our study provides further understanding of the bHLH members of the WD-repeat/bHLH/MYB complex in JA pathway.

SUBMITTER: Wen J

PROVIDER: S-EPMC5790409 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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The C-terminal domains of Arabidopsis GL3/EGL3/TT8 interact with JAZ proteins and mediate dimeric interactions.

Wen Jiangfeng J Li Yang Y Qi Tiancong T Gao Hua H Liu Bei B Zhang Min M Huang Huang H Song Susheng S

Plant signaling & behavior 20180116 1

The phytohormone jasmonates (JAs) regulate plant development, growth, secondary metabolism, and defense responses. JAs act through CORONATINE INSENSITIVE1 (COI1) to induce the degradation of JA ZIM-domain (JAZ) proteins, and activate JAZ-repressed transcription factors to regulate plant response. We previously showed that the basic helix-loop-helix (bHLH) and MYB members of the WD-repeat/bHLH/MYB complex interacted with JAZs and mediated JA-induced anthocyanin accumulation and trichome initiatio ...[more]

PMID: 29293407

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