Abstract:
:The promyelocytic leukemia gene was first identified through its fusion to the gene encoding the retinoic acid receptor alpha (RARalpha) in acute promyelocytic leukemia (APL) patients. The promyelocytic leukemia gene product (PML) becomes conjugated in vivo to the small ubiquitin-like protein SUMO-1, altering its behavior and capacity to recruit other proteins to PML nuclear bodies (PML-NBs). In the NB4 cell line, which was derived from an APL patient and expresses PML:RARalpha, we observed a retinoic acid-dependent change in the modification of specific proteins by SUMO-1. To dissect the interaction of PML with the SUMO-1 modification pathway, we used the budding yeast Saccharomyces cerevisiae as a model system through expression of PML and human SUMO-1 (hSUMO-1). We found that PML stimulated hSUMO-1 modification in yeast, in a manner that was dependent upon PML's RING-finger domain. PML:RARalpha also stimulated hSUMO-1 conjugation in yeast. Interestingly, however, PML and PML:RARalpha differentially complemented yeast Smt3p conjugation pathway mutants. These findings point toward a potential function of PML and PML:RARalpha as SUMO E3 enzymes or E3 regulators, and suggest that fusion of RARalpha to PML may affect this activity.
journal_name
Oncogenejournal_title
Oncogeneauthors
Quimby BB,Yong-Gonzalez V,Anan T,Strunnikov AV,Dasso Mdoi
10.1038/sj.onc.1209335subject
Has Abstractpub_date
2006-05-18 00:00:00pages
2999-3005issue
21eissn
0950-9232issn
1476-5594pii
1209335journal_volume
25pub_type
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