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- W4313384417 abstract "Abstract Association of RAG2 with the epigenetic marker H3K4me3 through a PHD domain in its noncore region is important for activating the RAG1 component of the RAG recombinase complex for V(D)J recombination. However, immunofluorescence staining of RAG2 expressed in thymocytes suggests RAG2 is localized principally to the nuclear periphery, away from sites of H3K4 modification. To further test for interactions between RAG2 and separate epigenetic markers, we used confocal microscopy to measure full length RAG2 labeled with GFP at its N-terminus (GFP-FL) and expressed in RAG2−/−pro-B cells. Cross-correlation analysis of cells immunostained with antibodies to H3K4me3 and H3K9me3 showed that RAG2 colocalization with H3K4me3 was significantly greater than with H3K9me3. Furthermore, blocking histone demethylation by treating cells with 2,4-pyridinedicarboxylic acid increased colocalization of GFP-FL with H3K4me3, but not its colocalization with H3K9me3. Interestingly, a GFP-labeled T490A mutant of full length RAG2 (GFP-T490A) showed significantly greater colocalization with H3K4me3 than the labeled wild-type RAG2. GFP-labeled RAG2 core alone (GFP-core) exhibited the poorest colocalization with H3K4me3 of the constructs that we measured. Finally, nanoscale resolution using structured illumination microscopy showed that RAG2 was unevenly distributed in the nucleus, containing dispersed RAG2-rich and RAG2-poor regions. Furthermore, RAG2 interactions with H3K4me3 were restricted to interfaces between H3K4me3-enriched puncta and the RAG2. Altogether, these data provide visualization of RAG2 binding to the epigenetic marker H3K4me3, and that Thr490 of RAG2 regulates this interaction." @default.
- W4313384417 created "2023-01-06" @default.
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- W4313384417 date "2017-05-01" @default.
- W4313384417 modified "2023-09-23" @default.
- W4313384417 title "Visualization of binding of RAG2 to H3K4me3 regulated by its noncore domain." @default.
- W4313384417 doi "https://doi.org/10.4049/jimmunol.198.supp.195.12" @default.
- W4313384417 hasPublicationYear "2017" @default.
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