COP9 signalosome- and 26S proteasome-dependent regulation of SCFTIR1 accumulation in Arabidopsis.

The Journal of Biological Chemistry
Johannes StuttmannLaurent D Noël

Abstract

Ubiquitination and proteasome-mediated degradation of proteins are crucial for eukaryotic physiology and development. The largest class of E3 ubiquitin ligases is made up of the cullin-RING ligases (CRLs), which themselves are positively regulated through conjugation of the ubiquitin-like peptide RUB/NEDD8 to cullins. RUB modification is antagonized by the COP9 signalosome (CSN), an evolutionarily conserved eight-subunit complex that is essential in most eukaryotes and cleaves RUB from cullins. The CSN behaves genetically as an activator of CRLs, although it abolishes CRL activity in vitro. This apparent paradox was recently reconciled in different organisms, as the CSN was shown to prevent autocatalytic degradation of several CRL substrate adaptors. We tested for such a mechanism in the model plant Arabidopsis by measuring the impact of a newly identified viable csn2 mutant on the activity and stability of SCF(TIR1), a receptor to the phytohormone auxin and probably the best characterized plant CRL. Our analysis reveals that not only the F-box protein TIR1 but also relevant cullins are destabilized in csn2 and other Arabidopsis csn mutants. These results provide an explanation for the auxin resistance of csn mutants. We furthe...Continue Reading

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