7v9i
The Monomer mutant of BEN4 domain of protein Bend3 with DNA
Structural highlights
FunctionBEND3_MOUSE Transcriptional repressor which associates with the NoRC (nucleolar remodeling complex) complex and plays a key role in repressing rDNA transcription. The sumoylated form modulates the stability of the NoRC complex component BAZ2A/TIP5 by controlling its USP21-mediated deubiquitination (By similarity). Binds to unmethylated major satellite DNA and is involved in the recruitment of the Polycomb repressive complex 2 (PRC2) to major satellites (PubMed:25457167). Stimulates the ERCC6L translocase and ATPase activities (By similarity).[UniProtKB:Q5T5X7][1] Publication Abstract from PubMedBivalent genes are ready for activation upon the arrival of developmental cues. Here we report that BEND3 is a CpG island (CGI) binding protein enriched at regulatory elements. The cocrystal structure of BEND3 in complex with its target DNA revealed the structural basis for its DNA methylation-sensitive binding property. Mouse embryos ablated of Bend3 died at pre-gastrulation stage. Bend3 null ES cells exhibited severe defects in differentiation, during which hundreds of CGI-containing bivalent genes were prematurely activated. BEND3 is required for stable association of PRC2 complex at bivalent genes that are highly occupied by BEND3, suggesting a reining function of BEND3 in maintaining high level of H3K27me3 at these bivalent genes in ES cells to prevent them from premature activation in the forthcoming developmental stage. Highly enriched BEND3 prevents the premature activation of bivalent genes during differentiation.,Zhang J, Zhang Y, You Q, Huang C, Zhang T, Wang M, Zhang T, Yang X, Xiong J, Li Y, Liu CP, Zhang Z, Xu RM, Zhu B Science. 2022 Feb 10:eabm0730. doi: 10.1126/science.abm0730. PMID:35143257[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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