- EMDB-21540: Holocomplex of E. coli class Ia ribonucleotide reductase with GDP... -
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Open data
ID or keywords:
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Basic information
Entry
Database: EMDB / ID: EMD-21540
Title
Holocomplex of E. coli class Ia ribonucleotide reductase with GDP and TTP
Map data
Holocomplex of E. coli class Ia ribonucleotide reductase with GDP and TTP
Sample
Complex: Holocomplex of E. coli class Ia ribonucleotide reductase with GDP and TTP
Protein or peptide: Ribonucleoside-diphosphate reductase 1 subunit alpha
Protein or peptide: Ribonucleoside-diphosphate reductase 1 subunit beta
Ligand: THYMIDINE-5'-TRIPHOSPHATE
Ligand: MAGNESIUM ION
Ligand: GUANOSINE-5'-DIPHOSPHATE
Ligand: MU-OXO-DIIRON
Ligand: water
Function / homology
Function and homology information
ribonucleoside diphosphate metabolic process / 2'-deoxyribonucleotide biosynthetic process / ribonucleoside-diphosphate reductase complex / nucleobase-containing small molecule interconversion / ribonucleoside-diphosphate reductase / ribonucleoside-diphosphate reductase activity, thioredoxin disulfide as acceptor / deoxyribonucleotide biosynthetic process / protein folding chaperone / iron ion binding / ATP binding ...ribonucleoside diphosphate metabolic process / 2'-deoxyribonucleotide biosynthetic process / ribonucleoside-diphosphate reductase complex / nucleobase-containing small molecule interconversion / ribonucleoside-diphosphate reductase / ribonucleoside-diphosphate reductase activity, thioredoxin disulfide as acceptor / deoxyribonucleotide biosynthetic process / protein folding chaperone / iron ion binding / ATP binding / identical protein binding / cytoplasm / cytosol Similarity search - Function
Ribonucleotide reductase, class I , alpha subunit / Ribonucleotide reductase large subunit signature. / Ribonucleoside-diphosphate reductase large subunit / ATP-cone domain / ATP cone domain / ATP-cone domain profile. / Ribonucleotide reductase R1 subunit, N-terminal / Ribonucleotide reductase large subunit, N-terminal / Ribonucleotide reductase, all-alpha domain / Ribonucleotide reductase large subunit, C-terminal ...Ribonucleotide reductase, class I , alpha subunit / Ribonucleotide reductase large subunit signature. / Ribonucleoside-diphosphate reductase large subunit / ATP-cone domain / ATP cone domain / ATP-cone domain profile. / Ribonucleotide reductase R1 subunit, N-terminal / Ribonucleotide reductase large subunit, N-terminal / Ribonucleotide reductase, all-alpha domain / Ribonucleotide reductase large subunit, C-terminal / Ribonucleotide reductase, barrel domain / Ribonucleotide reductase small subunit, acitve site / Ribonucleotide reductase small subunit signature. / Ribonucleotide reductase small subunit / Ribonucleotide reductase small subunit family / Ribonucleotide reductase, small chain / Ribonucleotide reductase-like / Ferritin-like superfamily Similarity search - Domain/homology
Journal: Science / Year: 2020 Title: Structure of a trapped radical transfer pathway within a ribonucleotide reductase holocomplex. Authors: Gyunghoon Kang / Alexander T Taguchi / JoAnne Stubbe / Catherine L Drennan / Abstract: Ribonucleotide reductases (RNRs) are a diverse family of enzymes that are alone capable of generating 2'-deoxynucleotides de novo and are thus critical in DNA biosynthesis and repair. The nucleotide ...Ribonucleotide reductases (RNRs) are a diverse family of enzymes that are alone capable of generating 2'-deoxynucleotides de novo and are thus critical in DNA biosynthesis and repair. The nucleotide reduction reaction in all RNRs requires the generation of a transient active site thiyl radical, and in class I RNRs, this process involves a long-range radical transfer between two subunits, α and β. Because of the transient subunit association, an atomic resolution structure of an active α2β2 RNR complex has been elusive. We used a doubly substituted β2, E52Q/(2,3,5)-trifluorotyrosine122-β2, to trap wild-type α2 in a long-lived α2β2 complex. We report the structure of this complex by means of cryo-electron microscopy to 3.6-angstrom resolution, allowing for structural visualization of a 32-angstrom-long radical transfer pathway that affords RNR activity.
History
Deposition
Mar 11, 2020
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Header (metadata) release
Apr 8, 2020
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Map release
Apr 8, 2020
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Update
May 6, 2020
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Current status
May 6, 2020
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Cryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 283 K / Instrument: FEI VITROBOT MARK IV / Details: blot for 4.5 seconds before plunging.
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Electron microscopy
Microscope
FEI TITAN KRIOS
Image recording
Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Number grids imaged: 2 / Number real images: 6238 / Average exposure time: 6.0 sec. / Average electron dose: 47.1 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron optics
Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
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Image processing
CTF correction
Software - Name: RELION (ver. 3.0)
Startup model
Type of model: INSILICO MODEL / In silico model: De novo 3D model generation in Relion
Final reconstruction
Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 80386
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