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Retinoid‐modulated MAT1 ubiquitination and CAK activity
Author(s) -
He Qiaojun,
Peng Hui,
Collins Steven J.,
Triche Timothy J.,
Wu Lingtao
Publication year - 2004
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.04-2182fje
Subject(s) - ubiquitin , phosphorylation , retinoic acid , microbiology and biotechnology , biology , kinase , biochemistry , chemistry , gene
Human cyclin‐dependent kinase (CDK)‐activating kinase (CAK) has a dual function in cross‐regulation of cell cycle and differentiation, whereas ménage à trois 1 (MAT1) assembles CAK and determines CAK's substrate specificity. Although the dynamic state of MAT1 protein levels is found to modulate CAK activity, how intracellular regulation of MAT1 controls CAK activity is unknown. Recent studies demonstrate that retinoic acid (RA)‐induced human HL60 cell proliferation/differentiation (P/D) transition is accompanied by MAT1 degradation and decreased CAK phosphorylation of retinoic acid receptor α (RARa). Thus, we investigated the biochemical pathway of MAT1 degradation and its relationship with CAK phosphorylation of RARa. We find that RA induces ubiquitination‐proteolysis of MAT1 and that ubiquitin‐proteasome targets CAK‐free MAT1 only. RA‐induced MAT1 ubiquitination reduces CAK abundance and decreases CAK phosphorylation of RARα, whereas inhibition of MAT1 ubiquitination resists this RA‐effect. These findings reveal that RA induces MAT1 ubiquitination to decrease CAK phosphorylation of RARα, suggesting a novel mechanism of RA‐mediated P/D transition in which MAT1 ubiquitination may act as an integral part of RA‐effect to decrease CAK activity in the switch from proliferation to differentiation.