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- PDB-9d4a: Atomic model of Ketoacyl Reductase domain and 4 helical bundle of... -

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Basic information

Entry
Database: PDB / ID: 9d4a
TitleAtomic model of Ketoacyl Reductase domain and 4 helical bundle of S. cerevisiae Fatty Acid Synthase (FAS) in complex with octanoyl-CoA (in vitro binding)
Components
  • Fatty acid synthase subunit alpha
  • Fatty acid synthase subunit beta
KeywordsBIOSYNTHETIC PROTEIN / octanoyl-CoA / FAS / allosteric inhibition
Function / homology
Function and homology information


fatty-acyl-CoA synthase system / fatty acid synthase complex / fatty-acyl-CoA synthase activity / palmitoyltransferase activity / [acyl-carrier-protein] S-acetyltransferase / [acyl-carrier-protein] S-acetyltransferase activity / holo-[acyl-carrier-protein] synthase activity / enoyl-[acyl-carrier-protein] reductase (NADPH) activity / [acyl-carrier-protein] S-malonyltransferase / [acyl-carrier-protein] S-malonyltransferase activity ...fatty-acyl-CoA synthase system / fatty acid synthase complex / fatty-acyl-CoA synthase activity / palmitoyltransferase activity / [acyl-carrier-protein] S-acetyltransferase / [acyl-carrier-protein] S-acetyltransferase activity / holo-[acyl-carrier-protein] synthase activity / enoyl-[acyl-carrier-protein] reductase (NADPH) activity / [acyl-carrier-protein] S-malonyltransferase / [acyl-carrier-protein] S-malonyltransferase activity / 3-hydroxyacyl-[acyl-carrier-protein] dehydratase / (3R)-hydroxyacyl-[acyl-carrier-protein] dehydratase activity / beta-ketoacyl-[acyl-carrier-protein] synthase I / 3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activity / 3-oxoacyl-[acyl-carrier-protein] reductase / oleoyl-[acyl-carrier-protein] hydrolase / fatty acyl-[ACP] hydrolase activity / enoyl-[acyl-carrier-protein] reductase (NADH) / enoyl-[acyl-carrier-protein] reductase (NADH) activity / long-chain fatty acid biosynthetic process / fatty acid synthase activity / 3-oxoacyl-[acyl-carrier-protein] synthase activity / lipid droplet / magnesium ion binding / mitochondrion / cytoplasm / cytosol
Similarity search - Function
Fatty acid synthase beta subunit AflB /Fas1-like, fungi / Fatty acid synthase, meander beta sheet domain / Fatty acid synthase subunit beta, N-terminal domain / N-terminal domain in fatty acid synthase subunit beta / Fatty acid synthase meander beta sheet domain / Fatty acid synthase subunit beta, insertion domain / Fatty acid synthase beta subunit AflB /Fas1-like, central domain / Fatty acid synthase alpha subunit, yeast / Fatty acid synthase subunit beta/Fas1-like, helical / Fatty acid synthase subunit alpha, acyl carrier domain ...Fatty acid synthase beta subunit AflB /Fas1-like, fungi / Fatty acid synthase, meander beta sheet domain / Fatty acid synthase subunit beta, N-terminal domain / N-terminal domain in fatty acid synthase subunit beta / Fatty acid synthase meander beta sheet domain / Fatty acid synthase subunit beta, insertion domain / Fatty acid synthase beta subunit AflB /Fas1-like, central domain / Fatty acid synthase alpha subunit, yeast / Fatty acid synthase subunit beta/Fas1-like, helical / Fatty acid synthase subunit alpha, acyl carrier domain / Fatty acid synthase subunit alpha Acyl carrier domain / Fatty acid synthase type I, helical / : / Fatty acid synthase type I helical domain / : / Fatty acid synthase / N-terminal of MaoC-like dehydratase / FAS1-like, dehydratase domain region / Starter unit:ACP transacylase / Starter unit:ACP transacylase in aflatoxin biosynthesis / Holo-[acyl carrier protein] synthase / Phosphopantetheine-protein transferase domain / MaoC-like dehydratase domain / MaoC like domain / 4'-phosphopantetheinyl transferase domain / 4'-phosphopantetheinyl transferase domain superfamily / 4'-phosphopantetheinyl transferase superfamily / Acyl transferase / Acyl transferase domain / Acyl transferase domain in polyketide synthase (PKS) enzymes. / Acyl transferase domain superfamily / Acyl transferase/acyl hydrolase/lysophospholipase / HotDog domain superfamily / Beta-ketoacyl synthase, active site / Ketosynthase family 3 (KS3) active site signature. / Ketosynthase family 3 (KS3) domain profile. / Beta-ketoacyl synthase, N-terminal / Beta-ketoacyl synthase, C-terminal / Polyketide synthase, beta-ketoacyl synthase domain / Beta-ketoacyl synthase, N-terminal domain / Beta-ketoacyl synthase, C-terminal domain / Thiolase-like / Phosphopantetheine attachment site. / Carrier protein (CP) domain profile. / Phosphopantetheine binding ACP domain / Aldolase-type TIM barrel / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
FLAVIN MONONUCLEOTIDE / Chem-SXO / Fatty acid synthase subunit beta / Fatty acid synthase subunit alpha
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.61 Å
AuthorsHasan, N.S.M. / Keszei, F.A.A. / Mazhab-Jafari, M.T.
Funding support Canada, 2items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)419240 Canada
Natural Sciences and Engineering Research Council (NSERC, Canada)RGPIN-2018-06070 Canada
CitationJournal: Structure / Year: 2025
Title: Allosteric regulation of fungal fatty acid synthesis.
Authors: S M Naimul Hasan / Elnaz Khalili Samani / Alexander F A Keszei / Mahtab Heydari / Mohammad T Mazhab-Jafari /
Abstract: Mycobiota fatty acid synthases (FASs) catalyze iterative cycles of condensation, dehydration, and reduction to produce saturated fatty acids. Although these multienzymes are attractive antifungal ...Mycobiota fatty acid synthases (FASs) catalyze iterative cycles of condensation, dehydration, and reduction to produce saturated fatty acids. Although these multienzymes are attractive antifungal drug targets, no clinically approved small-molecule inhibitors exist, and the regulation of de novo fatty acid synthesis remains poorly understood. Here, we identify an allosteric regulation of the FAS ketoacyl reduction reaction by palmitoyl-CoA. The palmitate moiety binds a distal site on the central wheel of fungal FAS from Saccharomyces cerevisiae and Candida albicans. This site also accommodates shorter acyl chains, but only palmitoyl-CoA suppresses ketoacyl reductase (KR) activity. While no major conformational changes occur in the reductase domain, palmitoyl-CoA binding quenches dynamics in the central disk, improving local resolution and stabilizing structured water molecules. This entropic effect underlies allosteric communication to the reductase site. Our findings uncover a regulatory mechanism of fungal FAS exploitable for antifungal drug design.
History
DepositionAug 12, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 20, 2025Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 20, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Oct 15, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Fatty acid synthase subunit beta
B: Fatty acid synthase subunit alpha
E: Fatty acid synthase subunit beta
F: Fatty acid synthase subunit alpha
I: Fatty acid synthase subunit beta
J: Fatty acid synthase subunit alpha
M: Fatty acid synthase subunit beta
N: Fatty acid synthase subunit alpha
Q: Fatty acid synthase subunit beta
R: Fatty acid synthase subunit alpha
U: Fatty acid synthase subunit beta
V: Fatty acid synthase subunit alpha
hetero molecules


Theoretical massNumber of molelcules
Total (without water)2,621,58924
Polymers2,615,94412
Non-polymers5,64512
Water55,1263060
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Fatty acid synthase subunit beta


Mass: 228838.250 Da / Num. of mol.: 6 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast)
References: UniProt: P07149, fatty-acyl-CoA synthase system, 3-hydroxyacyl-[acyl-carrier-protein] dehydratase, enoyl-[acyl-carrier-protein] reductase (NADH), [acyl-carrier-protein] S- ...References: UniProt: P07149, fatty-acyl-CoA synthase system, 3-hydroxyacyl-[acyl-carrier-protein] dehydratase, enoyl-[acyl-carrier-protein] reductase (NADH), [acyl-carrier-protein] S-acetyltransferase, [acyl-carrier-protein] S-malonyltransferase, oleoyl-[acyl-carrier-protein] hydrolase
#2: Protein
Fatty acid synthase subunit alpha


Mass: 207152.359 Da / Num. of mol.: 6 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast)
References: UniProt: P19097, fatty-acyl-CoA synthase system, 3-oxoacyl-[acyl-carrier-protein] reductase, beta-ketoacyl-[acyl-carrier-protein] synthase I
#3: Chemical
ChemComp-FMN / FLAVIN MONONUCLEOTIDE / RIBOFLAVIN MONOPHOSPHATE


Mass: 456.344 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C17H21N4O9P
#4: Chemical
ChemComp-SXO / S-[2-({N-[(2S)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alanyl}amino)ethyl] octanethioate


Mass: 484.544 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C19H37N2O8PS / Feature type: SUBJECT OF INVESTIGATION
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 3060 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
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: Fatty acid synthase / Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL
Molecular weightValue: 2.6 MDa / Experimental value: YES
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER/RHODIUM / Grid mesh size: 400 divisions/in. / Grid type: Homemade
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 297 K

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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: 600 nm
Image recordingElectron dose: 50.1 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2EPUimage acquisition
4cryoSPARCCTF correction
7Cootmodel fitting
9cryoSPARCinitial Euler assignment
10cryoSPARCfinal Euler assignment
12cryoSPARC3D reconstruction
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 615912
SymmetryPoint symmetry: D3 (2x3 fold dihedral)
3D reconstructionResolution: 2.61 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 535715 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 6TA1

6ta1


Accession code: 6TA1 / Source name: PDB / Type: experimental model

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