Dataset Information

L3MBTL2 protein acts in concert with PcG protein-mediated monoubiquitination of H2A to establish a repressive chromatin structure.

ABSTRACT: We have identified human MBT domain-containing protein L3MBTL2 as an integral component of a protein complex that we termed Polycomb repressive complex 1 (PRC1)-like 4 (PRC1L4), given the copresence of PcG proteins RING1, RING2, and PCGF6/MBLR. PRC1L4 also contained E2F6 and CBX3/HP1?, known to function in transcriptional repression. PRC1L4-mediated repression necessitated L3MBTL2 that compacted chromatin in a histone modification-independent manner. Genome-wide location analyses identified several hundred genes simultaneously bound by L3MBTL2 and E2F6, preferentially around transcriptional start sites that exhibited little overlap with those targeted by other E2Fs or by L3MBTL1, another MBT domain-containing protein that interacts with RB1. L3MBTL2-specific RNAi resulted in increased expression of target genes that exhibited a significant reduction in H2A lysine 119 monoubiquitination. Our findings highlight a PcG/MBT collaboration that attains repressive chromatin without entailing histone lysine methylation marks.

SUBMITTER: Trojer P

PROVIDER: S-EPMC3142354 | biostudies-literature | 2011 May

REPOSITORIES: biostudies-literature

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L3MBTL2 protein acts in concert with PcG protein-mediated monoubiquitination of H2A to establish a repressive chromatin structure.

Trojer Patrick P Cao Alina R AR Gao Zhonghua Z Li Yan Y Zhang Jin J Xu Xiaoqin X Li Guohong G Losson Regine R Erdjument-Bromage Hediye H Tempst Paul P Farnham Peggy J PJ Reinberg Danny D

Molecular cell 20110501 4

We have identified human MBT domain-containing protein L3MBTL2 as an integral component of a protein complex that we termed Polycomb repressive complex 1 (PRC1)-like 4 (PRC1L4), given the copresence of PcG proteins RING1, RING2, and PCGF6/MBLR. PRC1L4 also contained E2F6 and CBX3/HP1γ, known to function in transcriptional repression. PRC1L4-mediated repression necessitated L3MBTL2 that compacted chromatin in a histone modification-independent manner. Genome-wide location analyses identified seve ...[more]

PMID: 21596310

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Project description:Human MBT domain‐containing protein L3MBTL2 was found to be an integral component of a protein complex that we termed Polycomb Repressive Complex 1‐like 3 (PRC1L3) given the presence of the PcG proteins RING1, RING2 and PCGF6. L3MBTL2 binds chromatin in a histone modification‐ independent manner and is required for the repressive function of PRC1L3. PRC1L3 also contains E2F6 and CBX3, two factors with well‐established functions in transcriptional repression. Genome‐wide profiling identified several hundred genes that are simultaneously bound by L3MBTL2 and E2F6, preferentially around transcriptional start sites. Importantly, these genes are largely distinct from those targeted by other E2Fs or L3MBTL, another MBT‐domain containing protein that interacts with RB1. H3K27 or H3K9 methylation, two chromatin modifications implicated in gene silencing, are not present on all L3MBTL2 target genes. L3MBTL2‐specific RNAi results in altered target gene expression patterns and affects the differentiation program of hematopoietic cells. Our data suggest that repression of transcription via chromatin modulation, reflective of PRC1 function, can be achieved by multiple players and does not necessarily require the presence of histone lysine methylation marks. 12 total ChIP-seq datasets; one E2F6 dataset and one Input dataset done from MCF7 cells on Nimblegen ENCODE arrays; one L3MBTL1 dataset and one Input dataset done from MCF7 cells on Nimblegen ENCODE arrays; one L3MBTL2 dataset and one Input dataset done from MCF7 cells on Nimblegen ENCODE arrays; one E2F6 dataset and one Input dataset done from MCF7 cells on Nimblegen 1.5kb promoter arrays; one L3MBTL1 dataset and one Input dataset done from MCF7 cells on Nimblegen 1.5kb promoter arrays; one L3MBTL2 dataset and one Input dataset done from MCF7 cells on Nimblegen 1.5kb promoter arrays.

Dataset Information

L3MBTL2 protein acts in concert with PcG protein-mediated monoubiquitination of H2A to establish a repressive chromatin structure.

Publications

L3MBTL2 protein acts in concert with PcG protein-mediated monoubiquitination of H2A to establish a repressive chromatin structure.

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