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• W4210702511 endingPage "167482" @default.
• W4210702511 startingPage "167482" @default.
• W4210702511 abstract "Somatic R882H DNMT3A mutations occur frequently in AML, but their pathogenic mechanism is unclear. As R882H mutations usually are heterozygous, wildtype (WT) and R882H subunits co-exist in affected cells. R882 is located in the RD interface of DNMT3A tetramers, which forms the DNA binding site. R882H causes strong changes in the flanking sequence preferences of DNMT3A. Here, we analyzed flanking sequence preferences for CGNNNN sites showing that most disfavored sites are methylated 4-5 fold slower by R882H than WT, while it methylates most preferred sites 2-fold faster. Overall, R882H was more active than WT at 13% and less active at 52% of all CGNNNN sites. We prepared mixed DNMT3A heterotetramers containing WT and R882H subunits and show that mixed complexes preferentially assemble with an R882H/R882H RD interface. Structural comparisons and MD simulations confirmed the conclusion that the R882H RD interface is more stable than that of WT, in part because H882 forms an inter-subunit contact in the RD interface, while R882 contacts the DNA. As the subunits at the RD interface contribute the two active centers to the DNMT3A tetramer, R882H characteristic flanking sequence preferences of DNMT3A were observed in mixed tetrameric complexes containing WT and R882H subunits, and they are not diluted by the averaged effects of mixed or WT interfaces. Hence, R882H has a dominant effect on the flanking sequence preferences and other catalytic properties of DNMT3A in samples containing WT and R882H subunits, which may explain its pathogenic effect in heterozygous state." @default.
• W4210702511 created "2022-02-08" @default.
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• W4210702511 date "2022-04-01" @default.
• W4210702511 modified "2023-10-14" @default.
• W4210702511 title "Preferential Self-interaction of DNA Methyltransferase DNMT3A Subunits Containing the R882H Cancer Mutation Leads to Dominant Changes of Flanking Sequence Preferences" @default.
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• W4210702511 doi "https://doi.org/10.1016/j.jmb.2022.167482" @default.
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