1. Combinatorial Histone Readout by the Dual Plant Homeodomain (PHD) Fingers of Rco1 Mediates Rpd3S Chromatin Recruitment and the Maintenance of Transcriptional Fidelity.
- Author
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McDaniel SL, Fligor JE, Ruan C, Cui H, Bridgers JB, DiFiore JV, Guo AH, Li B, and Strahl BD
- Subjects
- Amino Acid Sequence, Histone Deacetylases metabolism, Plant Proteins chemistry, Sequence Homology, Amino Acid, Chromatin metabolism, Histones metabolism, Plant Proteins metabolism, Transcription, Genetic
- Abstract
The plant homeodomain (PHD) finger is found in many chromatin-associated proteins and functions to recruit effector proteins to chromatin through its ability to bind both methylated and unmethylated histone residues. Here, we show that the dual PHD fingers of Rco1, a member of the Rpd3S histone deacetylase complex recruited to transcribing genes, operate in a combinatorial manner in targeting the Rpd3S complex to histone H3 in chromatin. Although mutations in either the first or second PHD finger allow for Rpd3S complex formation, the assembled complexes from these mutants cannot recognize nucleosomes or function to maintain chromatin structure and prevent cryptic transcriptional initiation from within transcribed regions. Taken together, our findings establish a critical role of combinatorial readout in maintaining chromatin organization and in enforcing the transcriptional fidelity of genes., (© 2016 by The American Society for Biochemistry and Molecular Biology, Inc.)
- Published
- 2016
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