Background: Somatic mutations in epigenetic enzymes are frequently found in cancer tissues. The MLL3 H3K4-specific protein lysine monomethyltransferase is an important epigenetic enzyme, and it is among the most recurrently mutated enzymes in cancers. MLL3 mainly introduces H3K4me1 at enhancers.
Results: We investigated the enzymatic properties of MLL3 variants that carry somatic cancer mutations. Asn4848 is located at the cofactor binding sites, and the N4848S exchange renders the enzyme inactive. Tyr4884 is part of an aromatic pocket at the active center of the enzyme, and Y4884C converts MLL3 from a monomethyltransferase with substrate preference for H3K4me0 to a trimethyltransferase with H3K4me1 as preferred substrate. Expression of Y4884C leads to aberrant H3K4me3 formation in cells.
Conclusions: Our data show that different somatic cancer mutations of MLL3 affect the enzyme activity in distinct and opposing manner highlighting the importance of experimentally studying the effects of somatic cancer mutations in key regulatory enzymes in order to develop and apply targeted tumor therapy.
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http://dx.doi.org/10.1186/s13148-015-0075-3 | DOI Listing |
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Institute of Biomedical Chemistry, Pogodinskaya Street, 10/8, 119121 Moscow, Russia.
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View Article and Find Full Text PDFInt J Mol Sci
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Department of Hematology and Oncology, University Medical Center Schleswig-Holstein (UKSH), University Cancer Center Schleswig-Holstein (UCCSH), Campus Lübeck, 23538 Lübeck, Germany.
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Institute of Medical Sciences, University of Rzeszow, 35-310 Rzeszow, Poland.
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View Article and Find Full Text PDFBiomedicines
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Department of Oral and Maxillofacial Clinical Sciences, Faculty of Dentistry, Universiti Malaya, Kuala Lumpur 50603, Malaysia.
Oral potentially malignant disorders (OPMD) are a group of lesions carrying the risk of developing into cancer. The gold standard to predict which lesions are more likely to undergo malignant transformation is the presence of dysplasia histologically. However, not all dysplastic lesions progress, and non-dysplastic lesions may also undergo malignant transformation.
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