Journal: Nature / Year: 2016 Title: Cullin-RING ubiquitin E3 ligase regulation by the COP9 signalosome. Authors: Simone Cavadini / Eric S Fischer / Richard D Bunker / Alessandro Potenza / Gondichatnahalli M Lingaraju / Kenneth N Goldie / Weaam I Mohamed / Mahamadou Faty / Georg Petzold / Rohan E J ...Authors: Simone Cavadini / Eric S Fischer / Richard D Bunker / Alessandro Potenza / Gondichatnahalli M Lingaraju / Kenneth N Goldie / Weaam I Mohamed / Mahamadou Faty / Georg Petzold / Rohan E J Beckwith / Ritesh B Tichkule / Ulrich Hassiepen / Wassim Abdulrahman / Radosav S Pantelic / Syota Matsumoto / Kaoru Sugasawa / Henning Stahlberg / Nicolas H Thomä / 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- ...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.
History
Deposition
Jan 30, 2016
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Header (metadata) release
Feb 24, 2016
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Map release
Apr 6, 2016
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Update
Apr 13, 2016
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Current status
Apr 13, 2016
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Details: Quantifoil holey carbon grids (R1.2/1.3, Cu 400 mesh) and Lacey carbons films
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 93 K / Instrument: LEICA EM GP / Method: Blot for 2 seconds before plunging
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Electron microscopy
Microscope
FEI TITAN KRIOS
Specialist optics
Energy filter - Name: Gatan Image Filter Quantum LS / Energy filter - Lower energy threshold: 0.0 eV / Energy filter - Upper energy threshold: 20.0 eV
Date
Jun 1, 2015
Image recording
Category: CCD / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Number real images: 2626 Details: Every image is the average of 38 frames recorded by the direct electron detector
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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