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J Biol Chem. 2012 Dec 21;287(52):43410-6. doi: 10.1074/jbc.M112.423855. Epub 2012 Nov 5.

A subset of mixed lineage leukemia proteins has plant homeodomain (PHD)-mediated E3 ligase activity.

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1
Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA.

Abstract

The mixed lineage leukemia protein MLL1 contains four highly conserved plant homeodomain (PHD) fingers, which are invariably deleted in oncogenic MLL1 fusion proteins in human leukemia. Here we show that the second PHD finger (PHD2) of MLL1 is an E3 ubiquitin ligase in the presence of the E2-conjugating enzyme CDC34. This activity is conserved in the second PHD finger of MLL4, the closest homolog to MLL1 but not in MLL2 or MLL3. Mutation of PHD2 leads to MLL1 stabilization, as well as increased transactivation ability and MLL1 recruitment to the target gene loci, suggesting that PHD2 negatively regulates MLL1 activity.

PMID:
23129768
PMCID:
PMC3527928
DOI:
10.1074/jbc.M112.423855
[Indexed for MEDLINE]
Free PMC Article
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