The TFIIH Subunit Tfb3 Regulates Cullin Neddylation

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The TFIIH Subunit Tfb3 Regulates Cullin Neddylation Gwenaël Rabut, Gaëlle Le Dez, Rati Verma, Taras Makhnevych, Axel Knebel, Thimo Kurz, Charles Boone,
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The TFIIH Subunit Tfb3 Regulates Cullin Neddylation Gwenaël Rabut, Gaëlle Le Dez, Rati Verma, Taras Makhnevych, Axel Knebel, Thimo Kurz, Charles Boone, Raymond J. Deshaies, Matthias Peter  Molecular Cell  Volume 43, Issue 3, Pages 488-495 (August 2011) DOI: 10.1016/j.molcel.2011.05.032 Copyright © 2011 Elsevier Inc. Terms and Conditions

Molecular Cell 2011 43, 488-495DOI: (10.1016/j.molcel.2011.05.032) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 1 Neddylation and Ubiquitylation of Lysine 791 Activate Rtt101 (A) Rtt101 lysine 791 but not neddylation is required for yeast resistance to replication stress. Equivalent amounts of the indicated yeast strains were spotted in 5-fold serial dilutions onto YPD plates supplemented as indicated with MMS or CPT. More details about the yeast strains used in each figure panel can be found in the Supplemental Experimental Procedures. (B) The Rub1-independent modification of Rtt101 depends on Ubc4. Immunoblot of total extracts prepared from yeast strains with either wild-type (wt) or the K791R mutant of tagged Rtt101 expressed from the endogenous promoter. See also Figure S1. (C) Rtt101 is ubiquitylated in a K791-dependent manner. Immunoblot showing the modification of Rtt101 in cells expressing 9Myc-tagged ubiquitin or 9Myc-tagged Rub1. (D) Neddylation and ubiquitylation redundantly activate Rtt101. Equivalent amounts of the indicated yeast strains were spotted in 5-fold serial dilutions onto YPD plates, supplemented with 20 μg/ml CPT. See also Figure S1 and Tables S1 and S2. Molecular Cell 2011 43, 488-495DOI: (10.1016/j.molcel.2011.05.032) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 2 Rtt101 Modification in DCN1 and HRT1 Mutant Cells (A) Rtt101 neddylation and ubiquitylation is not impaired in dcn1Δ cells. Immunoblots showing the modification of Rtt101 and Cdc53 in the indicated yeast strains. (B) Position of I57A, C81Y and A51Δ mutations depicted on the structure of Rbx1 (red) in complex with neddylated Cul5 CTD (green) (DOI:10.2210/pdb3dqv/pdb). (C) Substrate ubiquitylation is impaired in hrt1(C81Y) and hrt1(I57A) cells. Immunoblot showing the steady state-level of Cdc4 in the indicated yeast strains. Actin was used to control equal loading. See also Figure S2. (D) Rtt101 and Cdc53 modification is not impaired in hrt1(C81Y) and hrt1(I57A) cells. Immunoblot showing the modification of Rtt101 and Cdc53 in the indicated yeast strains. Actin was used to control equal loading. (E) Kinetics of Rtt101 neddylation in vitro. Immunoblots showing Rtt101 modification in crude extracts after addition of recombinant Rub1 and ATP. See also Figure S2 and Tables S1 and S2. Molecular Cell 2011 43, 488-495DOI: (10.1016/j.molcel.2011.05.032) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 3 Tfb3 Controls Cul3 and Rtt101 Modification and Contributes to Their Function (A) Rtt101 modification is impaired in tfb3(C16Y) cells. Immunoblots showing the modification of Rtt101 and Cdc53 in the indicated yeast strains. See also Figure S3. (B) Kinetics of Rtt101 neddylation in tfb3(C16Y) extracts. Immunoblots showing Rtt101 modification in crude extracts after addition of recombinant Rub1 and ATP. (C) Tfb3 contributes to the cellular resistance to replication stress. Equivalent amounts of the indicated yeast strains were spotted in 5-fold serial dilutions onto YPD plates, supplemented with 10 μg/ml CPT. (D) Cul3 neddylation is impaired in dcn1Δ and tfb3(C16Y) cells. Immunoblot showing Cul3 neddylation in the indicated yeast strains. (E) Cul3 neddylation in vitro. Immunoblot showing Cul3 modification in crude extracts 1 hr after addition of recombinant Rub1 and ATP. (F) Tfb3 is needed for Rpb1 degradation after UV irradiation. Immunoblots showing Rpb1 levels after UV irradiation in the indicated yeast strains. Tubulin was used to control equal loading. See also Figure S3 and Tables S1 and S2. Molecular Cell 2011 43, 488-495DOI: (10.1016/j.molcel.2011.05.032) Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 4 Tfb3 Functions Downstream of Ubc12 and Interacts with Ubc12, Ubc4, and the Rtt101/Hrt1 Complex (A) Mutations in TFIIH subunits other than Tfb3 do not impair Rtt101 modification. Immunoblots showing the modification of Rtt101 in the indicated yeast strains. See also Figure S4A. (B) Rri1 and Lag2 do not inhibit Rtt101 modification in tfb3(C16Y) cells. Immunoblots showing the modification of Rtt101 and Cdc53 in the indicated yeast strains. (C) Ubc12 is properly charged with Rub1 in tfb3(C16Y) cells. Immunoblots of DTT- or TCEP-treated total extracts showing the amount of Rub1 charged Ubc12 (Ubc12∼Rub1) in the indicated yeast strains. Contrary to TCEP, DTT hydrolyses the thioester bond of Ubc12 charged with Rub1. Actin was used to control equal loading. (D) The RING domain of Tfb3 interacts with Ubc12 and Ubc4. Protein A-tagged Hrt1 (PA-Hrt1), and the RING-domains of Tfb3 [PA-Tfb3(RING)] or Ssl1 [PA-Ssl1(RING)] were expressed in E. coli together with GST, GST-Ubc12, GST-Ubc4, or GST-Rad6. Protein extracts prepared from these cells were incubated with glutathione beads (GSH beads) to precipitate GST-tagged E2 as well their binding partners. Proteins bound to GSH beads were visualized by Coomassie staining (top) and immunoblotting (middle). An aliquot of the extracts prior to precipitation was included for control (total extract, bottom). (E) Hrt1 and the Rtt101/Hrt1 complex physically interact with Tfb3. Recombinant GST, GST-Hrt1 and a complex of GST-Hrt1 and the Rtt101 CTD was immobilized on glutathione beads (GSH-beads), and incubated with extracts prepared from yeast cells expressing protein A-tagged Tfb3. Proteins bound to GSH beads were detected by Coomassie staining (top) and immunoblotting (bottom). See also Figure S4 and Tables S1 and S2. Molecular Cell 2011 43, 488-495DOI: (10.1016/j.molcel.2011.05.032) Copyright © 2011 Elsevier Inc. Terms and Conditions