Volume 33, Issue 4, Pages (February 2009)

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Volume 33, Issue 4, Pages 483-495 (February 2009) E2-RING Expansion of the NEDD8 Cascade Confers Specificity to Cullin Modification  Danny T. Huang, Olivier Ayrault, Harold W. Hunt, Asad M. Taherbhoy, David M. Duda, Daniel C. Scott, Laura A. Borg, Geoffrey Neale, Peter J. Murray, Martine F. Roussel, Brenda A. Schulman  Molecular Cell  Volume 33, Issue 4, Pages 483-495 (February 2009) DOI: 10.1016/j.molcel.2009.01.011 Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 1 UBE2F Forms a NEDD8 Thioester Conjugate In Vitro and In Vivo Autoradiograms showing 32P-UBL thioesters after E2 charging by E1∼32P-UBLs (top) and reduction with 100 mM DTT (bottom): (A) NAE1-UBA3∼NEDD8, (B) UBA1∼Ub, (C) SAE1-UBA2∼SUMO1, (D) UBA7∼ISG15, (E) UBA6∼Ub, and (F) UBA6∼FAT10. (G) Immunoblot showing 100 mM DTT reducible E2∼NEDD8 complexes detected with antibodies against E2 (α-Flag) and NEDD8 (α-N8) from NIH 3T3 cells infected with indicated retroviruses. (H) Immunoblot as in (G) (top) from whole-cell extracts (WCE) of NIH 3T3 cells infected with indicated retroviruses and lysed in urea buffer, and from nickel-agarose pull-downs (Ni, bottom). ∗, expected MW of E2∼NEDD8 oxy-ester complex. Molecular Cell 2009 33, 483-495DOI: (10.1016/j.molcel.2009.01.011) Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 2 Bipartite UBE2F Interaction with UBA3: A Conserved Φ-Φ-X-Φ UBA3 in NEDD8 E2 N Extensions (A) Structure of NAE1-UBA3∼NEDD8(T)-NEDD8(A)-MgATP-UBE2M(C111A) (Huang et al., 2007) depicting interactions between NEDD8's E1 (NAE1-UBA3, light pink, with ufd in red) and UBE2M (cyan). The thioester-bound NEDD8 (N8[T]) is yellow, and adenylation site NEDD8 (N8[A]) is lime. UBE2M's N extension and core domains are indicated. (B) Domain structure of UBE2F. (C) Michaelis-Menten curves for 32P-NEDD8 thioester conjugate formation by UBE2F and UBE2Fcore. (D) Detailed interactions between UBE2M's N extension (blue) and UBA3's docking groove (black) (Huang et al., 2004). (E) Michaelis-Menten curves for UBA3 docking groove mutant-catalyzed 32P-NEDD8 thioester conjugate formation by UBE2F and UBE2Fcore. (F) Autoradiogram of 32P-NEDD8 thioester conjugates formed by the indicated alanine mutant of UBE2F. (G) Michaelis-Menten curves for 32P-NEDD8 thioester conjugate formation by UBE2F and NAE1-UBA3 and mutants. (H) Structure-based sequence alignment of UBE2F and UBE2M's N-terminal extension from various species (Tables S2 and S3). Kinetic analyses (C, E, G) show standard errors, insets are representative autoradiograms indicating E2 concentrations and the number of independent replicates, and kinetic constants (kcat and Km values) are indicated. Molecular Cell 2009 33, 483-495DOI: (10.1016/j.molcel.2009.01.011) Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 3 Structural Basis for NE1ufd's Binding to Varying E2 Sequences (A) Overall structure of NE1ufd-UBE2Fcore (left) compared to NE1ufd-UBE2Mcore (Huang et al., 2005) (right). NE1ufd is red, UBE2Fcore gray, UBE2Mcore cyan, and E2 catalytic cysteines orange spheres. (B) UBE2Fcore and UBE2Mcore structural superposition. (C) Close-ups of NE1ufd-UBE2Fcore (left) and NE1ufd-UBE2Mcore (right) interfaces. Oxygens are red, nitrogens blue, and ionic interactions dashed. E2 residues are labeled in blue, and NE1ufd's in black. X, Leu394SeMet. (D) Structural superposition of the NE1ufd portions of NE1ufd-UBE2Fcore and NE1ufd-UBE2Mcore. Molecular Cell 2009 33, 483-495DOI: (10.1016/j.molcel.2009.01.011) Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 4 Effects of Ube2f and Ube2m Knockdown on Global Cellular Properties (A) Immunoblots of Ube2f and Ube2m proteins after infecting NIH 3T3 cells with retroviruses expressing shRNAs for control (Ctr), Ube2m, or Ube2f. (B) Average percent of cells in culture (three independent experiments) relative to control 5 and 10 days after infecting NIH 3T3 cells with the indicated retroviruses. (C) Average percent of Annexin V-positive cells (three independent experiments) detected by flow cytometry 8 days after infecting NIH 3T3 cells with the indicated retroviruses. Error bars, standard error. (D) Venn diagram displaying the results of transcriptome analysis from three independent experiments. Total numbers of up- and downregulated genes for NIH 3T3 cells treated with shRNA against Ube2m or Ube2f versus control, displaying percent overlap. Molecular Cell 2009 33, 483-495DOI: (10.1016/j.molcel.2009.01.011) Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 5 Distinct E2-Rbx Pairs Regulate Cullin NEDD8ylation Specificity In Vivo −N8 indicates unNedd8ylated and +N8 indicates Nedd8ylated cullin. (A) Immunoblots of urea lysates from NIH 3T3 cells infected with retroviruses expressing shRNA against control (Ctr), Ube2m, or Ube2f, probed with the indicated antisera. (B) Immunoblots of urea lysates from retrovirally infected NIH 3T3 cells as in (A), in the absence or presence of retroviruses expressing human UBE2M-HF or human UBE2F-HF, probed with the indicated antisera. (C) Immunoblots of urea lysates from retrovirally infected NIH 3T3 cells as in (A), in the absence or presence of retroviruses expressing shRNA against Rbx1 or Rbx2, probed with the indicated antisera. Molecular Cell 2009 33, 483-495DOI: (10.1016/j.molcel.2009.01.011) Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 6 Combinatorial Roles of RBXs and E2s Establish Cullin NEDD8ylation Specificity In Vitro (A and B) Autoradiograms of chase reactions monitoring (A) RBX1- or (B) RBX2-mediated 32P-NEDD8 transfer from UBE2F (left) and UBE2M (right) to the indicated CULCTD. (C) Autoradiograms for chase reactions monitoring 32P-NEDD8 transfer from UBE2F or UBE2M to the indicated CULCTD mediated by RBX chimeras harboring the indicated N terminus/RBX2 RING (top panel) and the indicated N terminus/RBX1 RING (bottom panel). (D) UBE2F reactions as in (A) and (B), except with RBX2(Ile52Ala)-CUL5 (left) and wild-type RBX2 in complex with non-NEDD8ylatable CUL5CTD(K724R) as indicated (right). (E) UBE2M reactions as in (A) and (B), except with RBX2(Ile44Ala)-CUL1 (left) and wild-type RBX1 in complex with non-NEDD8ylatable CUL1CTD(K720R) as indicated (right). Molecular Cell 2009 33, 483-495DOI: (10.1016/j.molcel.2009.01.011) Copyright © 2009 Elsevier Inc. Terms and Conditions

Figure 7 Hierarchical E2-RING Expansion of the NEDD8 Cascade Schematic view of distinct molecular pathways dictating specificity of cullin NEDD8ylation. Molecular Cell 2009 33, 483-495DOI: (10.1016/j.molcel.2009.01.011) Copyright © 2009 Elsevier Inc. Terms and Conditions