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- PDB-7u5s: CryoEM structure of the Candida albicans Aro1 dimer -

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Basic information

Entry
Database: PDB / ID: 7u5s
TitleCryoEM structure of the Candida albicans Aro1 dimer
ComponentsPentafunctional AROM polypeptide
KeywordsBIOSYNTHETIC PROTEIN
Function / homology
Function and homology information


3-dehydroquinate synthase / 3-dehydroquinate synthase activity / shikimate kinase / shikimate dehydrogenase (NADP+) / 3-phosphoshikimate 1-carboxyvinyltransferase / 3-phosphoshikimate 1-carboxyvinyltransferase activity / shikimate kinase activity / shikimate 3-dehydrogenase (NADP+) activity / 3-dehydroquinate dehydratase / 3-dehydroquinate dehydratase activity ...3-dehydroquinate synthase / 3-dehydroquinate synthase activity / shikimate kinase / shikimate dehydrogenase (NADP+) / 3-phosphoshikimate 1-carboxyvinyltransferase / 3-phosphoshikimate 1-carboxyvinyltransferase activity / shikimate kinase activity / shikimate 3-dehydrogenase (NADP+) activity / 3-dehydroquinate dehydratase / 3-dehydroquinate dehydratase activity / chorismate biosynthetic process / aromatic amino acid family biosynthetic process / amino acid biosynthetic process / phosphorylation / ATP binding / metal ion binding / cytoplasm
Similarity search - Function
Pentafunctional AroM protein / Shikimate dehydrogenase, AroM-type / 3-dehydroquinate synthase AroB / Quinate/shikimate 5-dehydrogenase/glutamyl-tRNA reductase / Shikimate / quinate 5-dehydrogenase / 3-dehydroquinate synthase domain / 3-dehydroquinate synthase / SDH, C-terminal / Shikimate 5'-dehydrogenase C-terminal domain / Shikimate kinase/Threonine synthase-like 1 ...Pentafunctional AroM protein / Shikimate dehydrogenase, AroM-type / 3-dehydroquinate synthase AroB / Quinate/shikimate 5-dehydrogenase/glutamyl-tRNA reductase / Shikimate / quinate 5-dehydrogenase / 3-dehydroquinate synthase domain / 3-dehydroquinate synthase / SDH, C-terminal / Shikimate 5'-dehydrogenase C-terminal domain / Shikimate kinase/Threonine synthase-like 1 / Shikimate kinase/gluconokinase / Shikimate kinase / 3-dehydroquinate dehydratase type I / Type I 3-dehydroquinase / EPSP synthase signature 1. / 3-phosphoshikimate 1-carboxyvinyltransferase / Shikimate dehydrogenase substrate binding, N-terminal / 3-phosphoshikimate 1-carboxyvinyltransferase, conserved site / Shikimate dehydrogenase substrate binding domain / EPSP synthase signature 2. / Enolpyruvate transferase domain / Enolpyruvate transferase domain superfamily / EPSP synthase (3-phosphoshikimate 1-carboxyvinyltransferase) / RNA 3'-terminal phosphate cyclase/enolpyruvate transferase, alpha/beta / Aminoacid dehydrogenase-like, N-terminal domain superfamily / Aldolase-type TIM barrel / NAD(P)-binding domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Pentafunctional AROM polypeptide
Similarity search - Component
Biological speciesCandida albicans (yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.16 Å
AuthorsQuade, B. / Borek, D. / Otwinowski, Z. / Center for Structural Genomics of Infectious Diseases (CSGID)
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)HHSN272201700060C United States
CitationJournal: Life Sci Alliance / Year: 2022
Title: Molecular analysis and essentiality of Aro1 shikimate biosynthesis multi-enzyme in .
Authors: Peter J Stogios / Sean D Liston / Cameron Semper / Bradley Quade / Karolina Michalska / Elena Evdokimova / Shane Ram / Zbyszek Otwinowski / Dominika Borek / Leah E Cowen / Alexei Savchenko /
Abstract: In the human fungal pathogen , encodes an essential multi-enzyme that catalyses consecutive steps in the shikimate pathway for biosynthesis of chorismate, a precursor to folate and the aromatic ...In the human fungal pathogen , encodes an essential multi-enzyme that catalyses consecutive steps in the shikimate pathway for biosynthesis of chorismate, a precursor to folate and the aromatic amino acids. We obtained the first molecular image of Aro1 that reveals the architecture of all five enzymatic domains and their arrangement in the context of the full-length protein. Aro1 forms a flexible dimer allowing relative autonomy of enzymatic function of the individual domains. Our activity and in cellulo data suggest that only four of Aro1's enzymatic domains are functional and essential for viability of , whereas the 3-dehydroquinate dehydratase (DHQase) domain is inactive because of active site substitutions. We further demonstrate that in , the type II DHQase Dqd1 can compensate for the inactive DHQase domain of Aro1, suggesting an unrecognized essential role for this enzyme in shikimate biosynthesis. In contrast, in and , which do not encode a Dqd1 homolog, Aro1 DHQase domains are enzymatically active, highlighting diversity across species.
History
DepositionMar 2, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 4, 2022Provider: repository / Type: Initial release
Revision 1.1May 18, 2022Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Feb 14, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Pentafunctional AROM polypeptide
B: Pentafunctional AROM polypeptide


Theoretical massNumber of molelcules
Total (without water)339,1932
Polymers339,1932
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Pentafunctional AROM polypeptide


Mass: 169596.250 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Candida albicans (yeast) / Strain: SC5314 / ATCC MYA-2876
References: UniProt: Q5AME2, 3-dehydroquinate synthase, 3-phosphoshikimate 1-carboxyvinyltransferase, shikimate kinase, 3-dehydroquinate dehydratase, shikimate dehydrogenase (NADP+)

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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: Aro1 dimer from Candida albicans / Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightValue: 0.1694 MDa / Experimental value: NO
Source (natural)Organism: Candida albicans (yeast) / Strain: CaLC6830
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
1150 mMsodium chloridaNaClSodium chloride1
210 mM4-(2-hydroxyethyl)-1-piperazineethanesulfonic acidHEPES1
SpecimenConc.: 2.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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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: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 105000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 1500 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 83.5 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
1Topazparticle selection
4cryoSPARCCTF correction
7UCSF Chimeramodel fitting
9cryoSPARCinitial Euler assignment
10cryoSPARCfinal Euler assignment
19PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1312555
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 4.16 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 87484 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
16C5C

6c5c

16C5C1PDBexperimental model
27TBU

7tbu

17TBU2PDBexperimental model
37TBV

7tbv

17TBV3PDBexperimental model

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