Plant Mol Biol (2017) 93:403–418 DOI 10.1007/s11103-016-0569-1 ABI5-binding proteins (AFPs) alter transcription of ABA-induced genes via a variety of interactions with chromatin modifiers 1 2 2,3 1 Tim J. Lynch · B. Joy Erickson · Dusty R. Miller · Ruth R. Finkelstein Received: 13 September 2016 / Accepted: 28 November 2016 / Published online: 9 December 2016 © Springer Science+Business Media Dordrecht 2016 Abstract were observed in yeast two-hybrid and bimolecular fluo- Key message Overexpression of ABI5/ABF bind- rescence assays, consistent with a more direct mechanism ing proteins (AFPs) results in extreme ABA resist- of AFP-mediated repression of gene expression. Chemical ance of seeds via multiple mechanisms repressing ABA inhibition of histone deacetylase activity by trichostatin A response, including interactions with histone deacety- suppressed AFP effects on a small fraction of the ABI5- lases and the co-repressor TOPLESS. regulated genes tested. Collectively, these results suggest Abstract Several ABI5/ABF binding proteins (AFPs) that the AFPs participate in multiple mechanisms modulat- inhibit ABA response, resulting in extreme ABA resistance ing ABA response, including both TOPLESS-dependent in transgenic Arabidopsis overexpression lines, but their and -independent chromatin modification. mechanism of action has remained obscure. By analogy to the related Novel Interactor of JAZ (NINJA) protein, it Keywords ABA-INSENSITIVE(ABI5) · AFP · was suggested that the AFPs interact
Plant Molecular Biology – Springer Journals
Published: Dec 9, 2016
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