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- PDB-9db2: Class Ia ribonucleotide reductase with mechanism-based inhibitor N3CDP -

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Basic information

Entry
Database: PDB / ID: 9db2
TitleClass Ia ribonucleotide reductase with mechanism-based inhibitor N3CDP
Components(Ribonucleoside-diphosphate reductase 1 subunit ...) x 2
KeywordsOXIDOREDUCTASE / ribonucleotide reductase / class Ia / mechanistic inhibition
Function / homology
Function and homology information


ribonucleoside diphosphate metabolic process / 2'-deoxyribonucleotide biosynthetic process / nucleobase-containing small molecule interconversion / ribonucleoside-diphosphate reductase complex / 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 / nucleobase-containing small molecule interconversion / ribonucleoside-diphosphate reductase complex / 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
ATP-cone domain / ATP cone domain / ATP-cone domain profile. / Ribonucleotide reductase, class I , alpha subunit / Ribonucleotide reductase large subunit signature. / Ribonucleoside-diphosphate reductase large subunit / Ribonucleotide reductase R1 subunit, N-terminal / Ribonucleotide reductase large subunit, N-terminal / Ribonucleotide reductase, all-alpha domain / Ribonucleotide reductase large subunit, C-terminal ...ATP-cone domain / ATP cone domain / ATP-cone domain profile. / Ribonucleotide reductase, class I , alpha subunit / Ribonucleotide reductase large subunit signature. / Ribonucleoside-diphosphate reductase large subunit / 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
: / ADENOSINE-5'-TRIPHOSPHATE / 2'-DEOXYADENOSINE 5'-TRIPHOSPHATE / MU-OXO-DIIRON / Unknown ligand / Ribonucleoside-diphosphate reductase 1 subunit alpha / Ribonucleoside-diphosphate reductase 1 subunit beta
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.6 Å
AuthorsWestmoreland, D.E. / Drennan, C.L.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R35GM126982-01 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM047274 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM29595 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1F32GM145072-01 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2024
Title: 2.6-Å resolution cryo-EM structure of a class Ia ribonucleotide reductase trapped with mechanism-based inhibitor NCDP.
Authors: Dana E Westmoreland / Patricia R Feliciano / Gyunghoon Kang / Chang Cui / Albert Kim / JoAnne Stubbe / Daniel G Nocera / Catherine L Drennan /
Abstract: Ribonucleotide reductases (RNRs) reduce ribonucleotides to deoxyribonucleotides using radical-based chemistry. For class Ia RNRs, the radical species is stored in a separate subunit (β2) from the ...Ribonucleotide reductases (RNRs) reduce ribonucleotides to deoxyribonucleotides using radical-based chemistry. For class Ia RNRs, the radical species is stored in a separate subunit (β2) from the subunit housing the active site (α2), requiring the formation of a short-lived α2β2 complex and long-range radical transfer (RT). RT occurs via proton-coupled electron transfer (PCET) over a long distance (~32-Å) and involves the formation and decay of multiple amino acid radical species. Here, we use cryogenic electron microscopy and a mechanism-based inhibitor 2'-azido-2'-deoxycytidine-5'-diphosphate (NCDP) to trap a wild-type α2β2 complex of class Ia RNR. We find that one α subunit has turned over and that the other is trapped, bound to β in a midturnover state. Instead of NCDP in the active site, forward RT has resulted in N loss, migration of the third nitrogen from the ribose C2' to C3' positions, and attachment of this nitrogen to the sulfur of cysteine-225. In this study, an inhibitor has been visualized as an adduct to an RNR. Additionally, this structure reveals the positions of PCET residues following forward RT, complementing the previous structure that depicted a preturnover PCET pathway and suggesting how PCET is gated at the α-β interface. This NCDP-trapped structure is also of sufficient resolution (2.6 Å) to visualize water molecules, allowing us to evaluate the proposal that water molecules are proton acceptors and donors as part of the PCET process.
History
DepositionAug 23, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 6, 2024Provider: repository / Type: Initial release
Revision 1.1Nov 27, 2024Group: Data collection / Category: em_admin / Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Ribonucleoside-diphosphate reductase 1 subunit alpha
B: Ribonucleoside-diphosphate reductase 1 subunit alpha
C: Ribonucleoside-diphosphate reductase 1 subunit beta
D: Ribonucleoside-diphosphate reductase 1 subunit beta
hetero molecules


Theoretical massNumber of molelcules
Total (without water)262,85018
Polymers258,8704
Non-polymers3,98014
Water11,241624
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Ribonucleoside-diphosphate reductase 1 subunit ... , 2 types, 4 molecules ABCD

#1: Protein Ribonucleoside-diphosphate reductase 1 subunit alpha / Protein B1 / Ribonucleoside-diphosphate reductase 1 R1 subunit / Ribonucleotide reductase 1


Mass: 85877.086 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: nrdA, dnaF, b2234, JW2228 / Production host: Escherichia coli (E. coli)
References: UniProt: P00452, ribonucleoside-diphosphate reductase
#2: Protein Ribonucleoside-diphosphate reductase 1 subunit beta / Protein B2 / Protein R2 / Ribonucleotide reductase 1


Mass: 43558.055 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: nrdB, ftsB, b2235, JW2229 / Production host: Escherichia coli (E. coli)
References: UniProt: P69924, ribonucleoside-diphosphate reductase

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Non-polymers , 7 types, 638 molecules

#3: Chemical ChemComp-DTP / 2'-DEOXYADENOSINE 5'-TRIPHOSPHATE


Mass: 491.182 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H16N5O12P3 / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mg
#5: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#6: Chemical ChemComp-UNL / UNKNOWN LIGAND


Mass: 214.110 Da / Num. of mol.: 1 / Source method: obtained synthetically / Feature type: SUBJECT OF INVESTIGATION
#7: Chemical ChemComp-A1A3L / 4-amino-1-{(3xi)-3-C-amino-2-deoxy-5-O-[(S)-hydroxy(phosphonooxy)phosphoryl]-beta-D-threo-pentofuranosyl}pyrimidin-2(1H)-one


Mass: 402.192 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C9H16N4O10P2 / Feature type: SUBJECT OF INVESTIGATION
#8: Chemical ChemComp-FEO / MU-OXO-DIIRON


Mass: 127.689 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe2O / Feature type: SUBJECT OF INVESTIGATION
#9: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 624 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Active state of class Ia ribonucleotide reductase trapped with mechanism-based inhibitor N3CDP
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.26069 MDa / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.6
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2300 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50.946 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionDetails: CTF correction using RELION's implementation of CTFFIND
Type: NONE
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 440549 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00418433
ELECTRON MICROSCOPYf_angle_d0.71425040
ELECTRON MICROSCOPYf_dihedral_angle_d5.8162537
ELECTRON MICROSCOPYf_chiral_restr0.0512739
ELECTRON MICROSCOPYf_plane_restr0.0063215

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