Arabidopsis S2Lb links AtCOMPASS-like and SDG2 activity in H3K4me3 independently from histone H2B monoubiquitination.

Details

Serval ID
serval:BIB_16B4BBAB0B88
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Arabidopsis S2Lb links AtCOMPASS-like and SDG2 activity in H3K4me3 independently from histone H2B monoubiquitination.
Journal
Genome biology
Author(s)
Fiorucci A.S., Bourbousse C., Concia L., Rougée M., Deton-Cabanillas A.F., Zabulon G., Layat E., Latrasse D., Kim S.K., Chaumont N., Lombard B., Stroebel D., Lemoine S., Mohammad A., Blugeon C., Loew D., Bailly C., Bowler C., Benhamed M., Barneche F.
ISSN
1474-760X (Electronic)
ISSN-L
1474-7596
Publication state
Published
Issued date
21/05/2019
Peer-reviewed
Oui
Volume
20
Number
1
Pages
100
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: epublish
Abstract
The functional determinants of H3K4me3, their potential dependency on histone H2B monoubiquitination, and their contribution to defining transcriptional regimes are poorly defined in plant systems. Unlike in Saccharomyces cerevisiae, where a single SET1 protein catalyzes H3K4me3 as part of COMPlex of proteins ASsociated with Set1 (COMPASS), in Arabidopsis thaliana, this activity involves multiple histone methyltransferases. Among these, the plant-specific SET DOMAIN GROUP 2 (SDG2) has a prominent role.
We report that SDG2 co-regulates hundreds of genes with SWD2-like b (S2Lb), a plant ortholog of the Swd2 axillary subunit of yeast COMPASS. We show that S2Lb co-purifies with the AtCOMPASS core subunit WDR5, and both S2Lb and SDG2 directly influence H3K4me3 enrichment over highly transcribed genes. S2Lb knockout triggers pleiotropic developmental phenotypes at the vegetative and reproductive stages, including reduced fertility and seed dormancy. However, s2lb seedlings display little transcriptomic defects as compared to the large repertoire of genes targeted by S2Lb, SDG2, or H3K4me3, suggesting that H3K4me3 enrichment is important for optimal gene induction during cellular transitions rather than for determining on/off transcriptional status. Moreover, unlike in budding yeast, most of the S2Lb and H3K4me3 genomic distribution does not rely on a trans-histone crosstalk with histone H2B monoubiquitination.
Collectively, this study unveils that the evolutionarily conserved COMPASS-like complex has been co-opted by the plant-specific SDG2 histone methyltransferase and mediates H3K4me3 deposition through an H2B monoubiquitination-independent pathway in Arabidopsis.
Keywords
Arabidopsis/metabolism, Histone Methyltransferases/metabolism, Histones/metabolism, Ubiquitination
Pubmed
Web of science
Open Access
Yes
Create date
25/05/2019 11:34
Last modification date
21/08/2019 6:32
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