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Next-gen reappraisal of interactions within a cancer-associated protein complex
Date:1/15/2014

f, control regions called promoters. By contrast, the DNA of cells harboring the stub exhibited DNA-binding H3K4me3 complexes in the middle of or between genes.

These discoveries, combined with other findings, call for re-interpretation of data suggesting that the stub is all you need for H3K4 trimethylation. Instead, the new work shows that COMPASS factors that bind to the SET1/MLL front end limit H3K4me3 deposition to the correct genomic sites (that is, to the promoter regions), while factors that bind the SET1/MLL stub increase the protein's half-life. This partially explains earlier misinterpretations: highly stable stubs of SET1 "promiscuously" methylated the wrong parts of the genome when the regulatory front end of the protein was missing. The paper also addressed how H2B ubiquitin modification machineries stimulate the entire process.

Understanding COMPASS regulation is essential, as genes encoding factors in the complex are mutant in numerous cancers. For example, chromosomal translocations involving a gene encoding one MLL protein occur frequently in human leukemias, hence the designation MLL, which stands for Mixed Lineage Leukemia protein. Other MLL proteins are strongly implicated as tumor suppressors in human cancers such as lymphoma and pediatric brain tumors.


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Contact: Gina Kirchweger
gxk@stowers.org
816-806-1036
Stowers Institute for Medical Research
Source:Eurekalert  

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