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- PDB-8vm6: Composite structure of human FASN with NADPH in State 8 -

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Basic information

Entry
Database: PDB / ID: 8vm6
TitleComposite structure of human FASN with NADPH in State 8
ComponentsFatty acid synthase
KeywordsBIOSYNTHETIC PROTEIN / Megasynthase / Lipogenesis
Function / homology
Function and homology information


fatty-acid synthase system / ether lipid biosynthetic process / Vitamin B5 (pantothenate) metabolism / neutrophil differentiation / fatty-acyl-CoA biosynthetic process / enoyl-[acyl-carrier-protein] reductase (NADPH, Re-specific) / glandular epithelial cell development / establishment of endothelial intestinal barrier / [acyl-carrier-protein] S-acetyltransferase / [acyl-carrier-protein] S-acetyltransferase activity ...fatty-acid synthase system / ether lipid biosynthetic process / Vitamin B5 (pantothenate) metabolism / neutrophil differentiation / fatty-acyl-CoA biosynthetic process / enoyl-[acyl-carrier-protein] reductase (NADPH, Re-specific) / glandular epithelial cell development / establishment of endothelial intestinal barrier / [acyl-carrier-protein] S-acetyltransferase / [acyl-carrier-protein] S-acetyltransferase activity / glycogen granule / Fatty acyl-CoA biosynthesis / oleoyl-[acyl-carrier-protein] hydrolase / fatty acyl-[ACP] hydrolase activity / modulation by host of viral process / ChREBP activates metabolic gene expression / [acyl-carrier-protein] S-malonyltransferase / 3-hydroxyacyl-[acyl-carrier-protein] dehydratase / enoyl-[acyl-carrier-protein] reductase (NADPH) activity / [acyl-carrier-protein] S-malonyltransferase activity / beta-ketoacyl-[acyl-carrier-protein] synthase I / (3R)-hydroxyacyl-[acyl-carrier-protein] dehydratase activity / NR1H2 & NR1H3 regulate gene expression linked to lipogenesis / mammary gland development / 3-oxoacyl-[acyl-carrier-protein] reductase / 3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activity / fatty acid synthase activity / monocyte differentiation / phosphopantetheine binding / 3-oxoacyl-[acyl-carrier-protein] synthase activity / cellular response to interleukin-4 / Activation of gene expression by SREBF (SREBP) / fatty acid metabolic process / fatty acid biosynthetic process / osteoblast differentiation / melanosome / cadherin binding / inflammatory response / Golgi apparatus / RNA binding / extracellular exosome / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
: / Fatty acid synthase, pseudo-KR domain / Methyltransferase type 12 / Methyltransferase domain / Thioesterase / Thioesterase domain / Polyketide synthase, dehydratase domain / PKS_DH / : / Polyketide synthase dehydratase domain ...: / Fatty acid synthase, pseudo-KR domain / Methyltransferase type 12 / Methyltransferase domain / Thioesterase / Thioesterase domain / Polyketide synthase, dehydratase domain / PKS_DH / : / Polyketide synthase dehydratase domain / Polyketide synthase, dehydratase domain superfamily / : / Polyketide and metazoan fatty acid synthase dehydratase (PKS/mFAS DH) domain profile. / Polyketide synthase, C-terminal extension / Ketoacyl-synthetase C-terminal extension / Polyketide synthase, ketoreductase domain / KR domain / Malonyl-CoA ACP transacylase, ACP-binding / : / Alcohol dehydrogenase-like, C-terminal / Zinc-binding dehydrogenase / Acyl transferase / Acyl transferase domain / Acyl transferase domain in polyketide synthase (PKS) enzymes. / Acyl transferase domain superfamily / Acyl transferase/acyl hydrolase/lysophospholipase / Polyketide synthase, enoylreductase domain / Enoylreductase / Polyketide synthase, phosphopantetheine-binding domain / Phosphopantetheine attachment site / PKS_KR / Beta-ketoacyl synthase, active site / Ketosynthase family 3 (KS3) active site signature. / Beta-ketoacyl synthase / 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 / GroES-like superfamily / Thiolase-like / Phosphopantetheine attachment site / Phosphopantetheine attachment site. / Phosphopantetheine attachment site / ACP-like superfamily / Carrier protein (CP) domain profile. / Phosphopantetheine binding ACP domain / Alpha/Beta hydrolase fold / NAD(P)-binding domain superfamily / S-adenosyl-L-methionine-dependent methyltransferase superfamily
Similarity search - Domain/homology
Chem-NDP / Fatty acid synthase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsSchultz, K. / Marmorstein, R.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM118090 United States
CitationJournal: Nature / Year: 2025
Title: Snapshots of acyl carrier protein shuttling in human fatty acid synthase.
Authors: Kollin Schultz / Pedro Costa-Pinheiro / Lauren Gardner / Laura V Pinheiro / Julio Ramirez-Solis / Sarah M Gardner / Kathryn E Wellen / Ronen Marmorstein /
Abstract: The mammalian fatty acid synthase (FASN) enzyme is a dynamic multienzyme that belongs to the megasynthase family. In mammals, a single gene encodes six catalytically active domains and a flexibly ...The mammalian fatty acid synthase (FASN) enzyme is a dynamic multienzyme that belongs to the megasynthase family. In mammals, a single gene encodes six catalytically active domains and a flexibly tethered acyl carrier protein (ACP) domain that shuttles intermediates between active sites for fatty acid biosynthesis. FASN is an essential enzyme in mammalian development through the role that fatty acids have in membrane formation, energy storage, cell signalling and protein modifications. Thus, FASN is a promising target for treatment of a large variety of diseases including cancer, metabolic dysfunction-associated fatty liver disease, and viral and parasite infections. The multi-faceted mechanism of FASN and the dynamic nature of the protein, in particular of the ACP, have made it challenging to understand at the molecular level. Here we report cryo-electron microscopy structures of human FASN in a multitude of conformational states with NADPH and NADP plus acetoacetyl-CoA present, including structures with the ACP stalled at the dehydratase (DH) and enoyl-reductase (ER) domains. We show that FASN activity in vitro and de novo lipogenesis in cells is inhibited by mutations at the ACP-DH and ACP-ER interfaces. Together, these studies provide new molecular insights into the dynamic nature of FASN and the ACP shuttling mechanism, with implications for developing improved FASN-targeted therapeutics.
History
DepositionJan 13, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 26, 2025Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Fatty acid synthase
B: Fatty acid synthase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)560,4266
Polymers557,4442
Non-polymers2,9824
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Fatty acid synthase / Type I fatty acid synthase


Mass: 278722.219 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FASN, FAS / Cell line (production host): Sf9 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P49327, fatty-acid synthase system, [acyl-carrier-protein] S-acetyltransferase, [acyl-carrier-protein] S-malonyltransferase, beta-ketoacyl-[acyl-carrier-protein] synthase I, 3- ...References: UniProt: P49327, fatty-acid synthase system, [acyl-carrier-protein] S-acetyltransferase, [acyl-carrier-protein] S-malonyltransferase, beta-ketoacyl-[acyl-carrier-protein] synthase I, 3-oxoacyl-[acyl-carrier-protein] reductase, 3-hydroxyacyl-[acyl-carrier-protein] dehydratase, enoyl-[acyl-carrier-protein] reductase (NADPH, Re-specific), oleoyl-[acyl-carrier-protein] hydrolase
#2: Chemical
ChemComp-NDP / NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE


Mass: 745.421 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C21H30N7O17P3 / Feature type: SUBJECT OF INVESTIGATION
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: human Fatty Acid Synthase / Type: COMPLEX
Details: Composite structure of human FASN with NADPH in State 8
Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.554 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm) / Strain: Sf9
Buffer solutionpH: 7
SpecimenConc.: 3.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R0.6/1
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 81000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 52.4 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 2 / Num. of real images: 19126
EM imaging opticsEnergyfilter slit width: 30 eV
Image scansWidth: 5760 / Height: 4092

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Processing

EM software
IDNameVersionCategory
1Topazparticle selection
2Leginonimage acquisition
4cryoSPARCCTF correction
7UCSF ChimeraX1.6model fitting
9PHENIX1.20.1_4487:model refinement
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
12cryoSPARCclassification
13cryoSPARC43D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 167765 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingPDB-ID: 3HHD

3hhd


Accession code: 3HHD / Chain residue range: 2-852 / Pdb chain residue range: 2-852 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00432628
ELECTRON MICROSCOPYf_angle_d0.48144398
ELECTRON MICROSCOPYf_dihedral_angle_d9.94511906
ELECTRON MICROSCOPYf_chiral_restr0.044987
ELECTRON MICROSCOPYf_plane_restr0.0045783

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