TY - JOUR
T1 - Quality control of a transcriptional regulator by SUMO-targeted degradation
AU - Wang, Zheng
AU - Prelich, Gregory
PY - 2009/4
Y1 - 2009/4
N2 - Slx5 and Slx8 are heterodimeric RING domain-containing proteins that possess SUMO-targeted ubiquitin ligase (STUbL) activity in vitro. Slx5-Slx8 and its orthologs are proposed to target SUMO conjugates for ubiquitin-mediated proteolysis, but the only in vivo substrate identified to date is mammalian PML, and the physiological importance of SUMO-targeted ubiquitylation remains largely unknown. We previously identified mutations in SLX5 and SLX8 by selecting for suppressors of a temperature-sensitive allele of M0T1, which encodes a regulator of TATA-binding protein. Here, we demonstrate that Motl is SUMOylated in vivo and that disrupting the Slx5-Slx8 pathway by mutation of the target lysines in Motl, by deletion of SLX5 or the ubiquitin E2 UBC4, or by inhibition of the proteosome suppresses motl-301 mutant phenotypes and increases the stability of the Motl-301 protein. The Motl-301 mutant protein is targeted for proteolysis by SUMOylation to a much greater extent than wild-type Motl, suggesting a quality control mechanism. In support of this idea, growth of Saccharomyces cerevisiae in the presence of the arginine analog canavanine results in increased SUMOylation and Slx5-Slx8-mediated degradation of wild-type Motl. These results therefore demonstrate that Motl is an in vivo STUbL target in yeast and suggest a role for SUMO-targeted degradation in protein quality control.
AB - Slx5 and Slx8 are heterodimeric RING domain-containing proteins that possess SUMO-targeted ubiquitin ligase (STUbL) activity in vitro. Slx5-Slx8 and its orthologs are proposed to target SUMO conjugates for ubiquitin-mediated proteolysis, but the only in vivo substrate identified to date is mammalian PML, and the physiological importance of SUMO-targeted ubiquitylation remains largely unknown. We previously identified mutations in SLX5 and SLX8 by selecting for suppressors of a temperature-sensitive allele of M0T1, which encodes a regulator of TATA-binding protein. Here, we demonstrate that Motl is SUMOylated in vivo and that disrupting the Slx5-Slx8 pathway by mutation of the target lysines in Motl, by deletion of SLX5 or the ubiquitin E2 UBC4, or by inhibition of the proteosome suppresses motl-301 mutant phenotypes and increases the stability of the Motl-301 protein. The Motl-301 mutant protein is targeted for proteolysis by SUMOylation to a much greater extent than wild-type Motl, suggesting a quality control mechanism. In support of this idea, growth of Saccharomyces cerevisiae in the presence of the arginine analog canavanine results in increased SUMOylation and Slx5-Slx8-mediated degradation of wild-type Motl. These results therefore demonstrate that Motl is an in vivo STUbL target in yeast and suggest a role for SUMO-targeted degradation in protein quality control.
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U2 - 10.1128/MCB.01470-08
DO - 10.1128/MCB.01470-08
M3 - Article
C2 - 19139279
AN - SCOPUS:63049110916
SN - 0270-7306
VL - 29
SP - 1694
EP - 1706
JO - Molecular and cellular biology
JF - Molecular and cellular biology
IS - 7
ER -