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Publication year
2009Author(s)
Number of pages
10 p.
Source
Leukemia, 23, 8, (2009), pp. 1480-1489ISSN
Publication type
Article / Letter to editor

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Organization
CHL
Paediatrics - OUD tm 2017
Laboratory of Hematology
Laboratory of Genetic, Endocrine and Metabolic Diseases
Human Genetics
Biochemistry (UMC)
Pharmacology-Toxicology
Haematology
Tumorimmunology
Journal title
Leukemia
Volume
vol. 23
Issue
iss. 8
Languages used
English (eng)
Page start
p. 1480
Page end
p. 1489
Subject
NCMLS 2: Immune Regulation; NCMLS 4: Energy and redox metabolism; NCMLS 5: Membrane transport and intracellular motility; ONCOL 2: Age-related aspects of cancer; ONCOL 3: Translational researchAbstract
Ubiquitination plays a major role in many aspects of hematopoiesis. Alterations in ubiquitination have been implicated in hematological cancer. The ubiquitin ligase Triad1 controls the proliferation of myeloid cells. Here, we show that two RING (really interesting new gene) domains in Triad1 differentially bind ubiquitin-conjugating enzymes, UbcH7 and Ubc13. UbcH7 and Ubc13 are known to catalyze the formation of different poly-ubiquitin chains. These chains mark proteins for proteasomal degradation or serve crucial non-proteolytic functions, respectively. In line with the dual Ubc interactions, we observed that Triad1 catalyzes the formation of both types of ubiquitin chains. The biological relevance of this finding was studied by testing Triad1 mutants in myeloid clonogenic assays. Full-length Triad1 and three mutants lacking conserved domains inhibited myeloid colony formation by over 50%. Strikingly, deletion of either RING finger completely abrogated the inhibitory effect of Triad1 in clonogenic growth. We conclude that Triad1 exhibits dual ubiquitin ligase activity and that both of its RING domains are crucial to inhibit myeloid cell proliferation. The differential interaction of the RINGs with Ubcs strongly suggests that the ubiquitination mediated through UbcH7 as well as Ubc13 plays a major role in myelopoiesis.
This item appears in the following Collection(s)
- Academic publications [227693]
- Electronic publications [107311]
- Faculty of Medical Sciences [86198]
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