UMMS Affiliation

Department of Molecular, Cell, and Cancer Biology

Date

4-30-2016

Document Type

Article

Disciplines

Biochemistry | Cell Biology | Genetics and Genomics | Molecular Biology

Abstract

BACKGROUND: Nucleosomes have an important role in modulating access of DNA by regulatory factors. The role specific histone residues have in this process has been shown to be an important mechanism of transcription regulation. Previously, we identified eight amino acids in histones H3 and H4 that are required for nucleosome occupancy over highly transcribed regions of the genome.

RESULTS: We investigate the mechanism through which three of these previously identified histone H3 amino acids regulate nucleosome architecture. We find that histone H3 K122, Q120, and R49 are required for Spt2, Spt6, and Spt16 occupancies at genomic locations where transcription rates are high, but not over regions of low transcription rates. Furthermore, substitution at one residue, K122, located on the dyad axis of the nucleosome, results in improper reassembly and disassembly of nucleosomes, likely accounting for the transcription rate-dependent regulation by these mutant histones.

CONCLUSIONS: These data show that when specific amino acids of histone proteins are substituted, Spt2, Spt6, and Spt16 occupancies are reduced and nucleosome dynamics are altered. Therefore, these data support a mechanism for histone chaperone binding where these factors interact with histone proteins to promote their activities during transcription.

Rights and Permissions

Citation: Epigenetics Chromatin. 2016 Apr 30;9:17. doi: 10.1186/s13072-016-0066-4. eCollection 2016. Link to article on publisher's site

DOI of Published Version

10.1186/s13072-016-0066-4

Related Resources

Link to Article in PubMed

Keywords

Chromatin, Histone H3 K122, Histone chaperone, SRG1/SER3, Saccharomyces cerevisiae, Spt16, Spt2, Spt6, Transcription

Journal Title

Epigenetics and chromatin

PubMed ID

27134679

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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