Cullin-RING ubiquitin E3 ligase regulation by the COP9 signalosome.Cavadini, S., Fischer, E.S., Bunker, R.D., Potenza, A., Lingaraju, G.M., Goldie, K.N., Mohamed, W.I., Faty, M., Petzold, G., Beckwith, R.E., Tichkule, R.B., Hassiepen, U., Abdulrahman, W., Pantelic, R.S., Matsumoto, S., Sugasawa, K., Stahlberg, H., Thoma, N.H.
(2016) Nature 531: 598-603
- PubMed: 27029275
- DOI: 10.1038/nature17416
- PubMed Abstract:
The cullin-RING ubiquitin E3 ligase (CRL) family comprises over 200 members in humans. The COP9 signalosome complex (CSN) regulates CRLs by removing their ubiquitin-like activator NEDD8. The CUL4A-RBX1-DDB1-DDB2 complex (CRL4A(DDB2)) monitors the gen ...
The cullin-RING ubiquitin E3 ligase (CRL) family comprises over 200 members in humans. The COP9 signalosome complex (CSN) regulates CRLs by removing their ubiquitin-like activator NEDD8. The CUL4A-RBX1-DDB1-DDB2 complex (CRL4A(DDB2)) monitors the genome for ultraviolet-light-induced DNA damage. CRL4A(DBB2) is inactive in the absence of damaged DNA and requires CSN to regulate the repair process. The structural basis of CSN binding to CRL4A(DDB2) and the principles of CSN activation are poorly understood. Here we present cryo-electron microscopy structures for CSN in complex with neddylated CRL4A ligases to 6.4 Å resolution. The CSN conformers defined by cryo-electron microscopy and a novel apo-CSN crystal structure indicate an induced-fit mechanism that drives CSN activation by neddylated CRLs. We find that CSN and a substrate cannot bind simultaneously to CRL4A, favouring a deneddylated, inactive state for substrate-free CRL4 complexes. These architectural and regulatory principles appear conserved across CRL families, allowing global regulation by CSN.
Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, 4058 Basel, Switzerland.,Novartis Pharma AG, Institutes for Biomedical Research, Novartis Campus, 4056 Basel, Switzerland.,Center for Cellular Imaging and NanoAnalytics, Biozentrum, University of Basel, 4058 Basel, Switzerland.,Graduate School of Science, Kobe University, Kobe, 657-8501, Japan.,Biosignal Research Center, Organization of Advanced Science and Technology, Kobe University, Kobe 657-8501, Japan.,University of Basel, Petersplatz 10, 4003 Basel, Switzerland.,Department of Cancer Biology, Dana-Farber Cancer Institute, LC-4312, 360 Longwood Avenue, Boston, Massachusetts 02215, USA.,Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02215, USA.,Gatan R&D, 5974 W. Las Positas Boulevard, Pleasanton, California 94588, USA.,Novartis Institutes for Biomedical Research, 250 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.