Journal: J Biol Chem / Year: 2016 Title: The Dimeric Architecture of Checkpoint Kinases Mec1ATR and Tel1ATM Reveal a Common Structural Organization. Authors: Marta Sawicka / Paulina H Wanrooij / Vidya C Darbari / Elias Tannous / Sarem Hailemariam / Daniel Bose / Alena V Makarova / Peter M Burgers / Xiaodong Zhang / Abstract: The phosphatidylinositol 3-kinase-related protein kinases are key regulators controlling a wide range of cellular events. The yeast Tel1 and Mec1·Ddc2 complex (ATM and ATR-ATRIP in humans) play ...The phosphatidylinositol 3-kinase-related protein kinases are key regulators controlling a wide range of cellular events. The yeast Tel1 and Mec1·Ddc2 complex (ATM and ATR-ATRIP in humans) play pivotal roles in DNA replication, DNA damage signaling, and repair. Here, we present the first structural insight for dimers of Mec1·Ddc2 and Tel1 using single-particle electron microscopy. Both kinases reveal a head to head dimer with one major dimeric interface through the N-terminal HEAT (named after Huntingtin, elongation factor 3, protein phosphatase 2A, and yeast kinase TOR1) repeat. Their dimeric interface is significantly distinct from the interface of mTOR complex 1 dimer, which oligomerizes through two spatially separate interfaces. We also observe different structural organizations of kinase domains of Mec1 and Tel1. The kinase domains in the Mec1·Ddc2 dimer are located in close proximity to each other. However, in the Tel1 dimer they are fully separated, providing potential access of substrates to this kinase, even in its dimeric form.
History
Deposition
Aug 9, 2016
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Header (metadata) release
Oct 5, 2016
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Map release
Oct 5, 2016
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Update
Oct 5, 2016
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Current status
Oct 5, 2016
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Model: Quantifoil R2/2 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 4 K / Instrument: FEI VITROBOT MARK I / Details: Blot for 5.5 seconds before plunging..
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Electron microscopy
Microscope
FEI TECNAI F20
Image recording
Film or detector model: FEI FALCON II (4k x 4k) / Number grids imaged: 2 / Number real images: 268 / Average exposure time: 1.0 sec. / Average electron dose: 32.0 e/Å2
Electron beam
Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
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