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- PDB-9nal: Cryo-EM structure of ternary complex of human phosphoribosylglyci... -

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Basic information

Entry
Database: PDB / ID: 9nal
TitleCryo-EM structure of ternary complex of human phosphoribosylglycinamidine synthase with the intermediate (iminophosphate) and ADP bound at the synthase site.
ComponentsPhosphoribosylformylglycinamidine synthase
KeywordsLIGASE / iminophosphate ADP human phosphoribosylglycinamidine synthase
Function / homology
Function and homology information


anterior head development / phosphoribosylformylglycinamidine synthase / phosphoribosylformylglycinamidine synthase activity / purine ribonucleoside monophosphate biosynthetic process / 'de novo' XMP biosynthetic process / Purine ribonucleoside monophosphate biosynthesis / 'de novo' AMP biosynthetic process / glutamine metabolic process / purine nucleotide biosynthetic process / GMP biosynthetic process ...anterior head development / phosphoribosylformylglycinamidine synthase / phosphoribosylformylglycinamidine synthase activity / purine ribonucleoside monophosphate biosynthetic process / 'de novo' XMP biosynthetic process / Purine ribonucleoside monophosphate biosynthesis / 'de novo' AMP biosynthetic process / glutamine metabolic process / purine nucleotide biosynthetic process / GMP biosynthetic process / 'de novo' IMP biosynthetic process / response to xenobiotic stimulus / extracellular exosome / ATP binding / metal ion binding / cytoplasm / cytosol
Similarity search - Function
Phosphoribosylformylglycinamidine synthase PurL / Phosphoribosylformylglycinamidine synthase, N-terminal / : / Formylglycinamide ribonucleotide amidotransferase N-terminal / FGAR-AT PurM_N-like domain / CobB/CobQ-like glutamine amidotransferase domain / CobB/CobQ-like glutamine amidotransferase domain / Phosphoribosylformylglycinamidine synthase, linker domain / Formylglycinamide ribonucleotide amidotransferase linker domain / Phosphoribosylformylglycinamidine synthase subunit PurS-like superfamily ...Phosphoribosylformylglycinamidine synthase PurL / Phosphoribosylformylglycinamidine synthase, N-terminal / : / Formylglycinamide ribonucleotide amidotransferase N-terminal / FGAR-AT PurM_N-like domain / CobB/CobQ-like glutamine amidotransferase domain / CobB/CobQ-like glutamine amidotransferase domain / Phosphoribosylformylglycinamidine synthase, linker domain / Formylglycinamide ribonucleotide amidotransferase linker domain / Phosphoribosylformylglycinamidine synthase subunit PurS-like superfamily / PurM-like, C-terminal domain / PurM-like, C-terminal domain superfamily / PurM-like, N-terminal domain superfamily / AIR synthase related protein, C-terminal domain / Glutamine amidotransferase type 1 domain profile. / Class I glutamine amidotransferase-like
Similarity search - Domain/homology
: / ADENOSINE-5'-DIPHOSPHATE / Phosphoribosylformylglycinamidine synthase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.22 Å
AuthorsSharma, N. / French, J.B.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM124898 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)R01CA299056 United States
CitationJournal: Nat Commun / Year: 2026
Title: Structural and molecular basis for allosteric regulation and catalytic coupling of human phosphoribosylformylglycinamidine synthase
Authors: Sharma, N. / Zhou, W. / French, J.B.
History
DepositionFeb 12, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 25, 2026Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Phosphoribosylformylglycinamidine synthase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)149,8177
Polymers148,4961
Non-polymers1,3216
Water1,72996
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

#1: Protein Phosphoribosylformylglycinamidine synthase / FGAM synthase / FGAMS / Formylglycinamide ribonucleotide amidotransferase / FGAR amidotransferase / ...FGAM synthase / FGAMS / Formylglycinamide ribonucleotide amidotransferase / FGAR amidotransferase / FGAR-AT / Formylglycinamide ribotide amidotransferase / Phosphoribosylformylglycineamide amidotransferase


Mass: 148495.672 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PFAS, KIAA0361 / Production host: Homo sapiens (human)
References: UniProt: O15067, phosphoribosylformylglycinamidine synthase
#2: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Comment: ADP, energy-carrying molecule*YM
#3: Chemical ChemComp-A1B7I / N-[2-formamido-1-(phosphonooxy)ethylidene]-5-O-phosphono-beta-D-ribofuranosylamine


Mass: 394.166 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H16N2O12P2
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Mg
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 96 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN
Has protein modificationN

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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: human phosphoribosylglycinamidine synthase / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 750 nm
Image recordingElectron dose: 45 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.22 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 110648 / Symmetry type: POINT
RefinementHighest resolution: 3.22 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0049733
ELECTRON MICROSCOPYf_angle_d0.69913318
ELECTRON MICROSCOPYf_dihedral_angle_d7.8361427
ELECTRON MICROSCOPYf_chiral_restr0.0421502
ELECTRON MICROSCOPYf_plane_restr0.0081744

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