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- EMDB-44300: Human endogenous FASN with 1,3-DBP - Class 1 composite map -

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Basic information

Entry
Database: EMDB / ID: EMD-44300
TitleHuman endogenous FASN with 1,3-DBP - Class 1 composite map
Map dataHuman endogenous FASN with 1,3-DBP - Class 1 composite map
Sample
  • Complex: Human endogenous FASN with 1,3-DBP
KeywordsDe novo fatty acid synthesis Fatty acid synthase / BIOSYNTHETIC PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsChoi W / Li C / Chen Y / Wang Y / Cheng Y
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM140847 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)U54AI170792 United States
CitationJournal: Nature / Year: 2025
Title: Structural dynamics of human fatty acid synthase in the condensing cycle.
Authors: Wooyoung Choi / Chengmin Li / Yifei Chen / YongQiang Wang / Yifan Cheng /
Abstract: Long-chain fatty acids are the building blocks of fat in human bodies. In mammals, fatty acid synthase (FASN) contains multiple enzymatic domains to catalyse all chemical reactions needed for de novo ...Long-chain fatty acids are the building blocks of fat in human bodies. In mammals, fatty acid synthase (FASN) contains multiple enzymatic domains to catalyse all chemical reactions needed for de novo fatty acid synthesis. Although the chemical reactions carried out by these enzymatic domains are well defined, how the dimeric FASN with an open architecture continuously catalyses such reactions to synthesize a complete fatty acid remains elusive. Here, using a strategy of tagging and purifying endogenous FASN in HEK293T cells for single-particle cryo-electron microscopy studies, we characterized the structural dynamics of endogenous human FASN. We captured conformational snapshots of various functional substates in the condensing cycle and developed a procedure to analyse the particle distribution landscape of FASN with different orientations between its condensing and modifying wings. Together, our findings reveal that FASN function does not require a large rotational motion between its two main functional domains during the condensing cycle, and that the catalytic reactions in the condensing cycle carried out by the two monomers are unsynchronized. Our data thus provide a new composite view of FASN dynamics during the fatty acid synthesis condensing cycle.
History
DepositionMar 27, 2024-
Header (metadata) releaseFeb 26, 2025-
Map releaseFeb 26, 2025-
UpdateMay 21, 2025-
Current statusMay 21, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_44300.png

Downloads & links

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Map

FileDownload / File: emd_44300.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationHuman endogenous FASN with 1,3-DBP - Class 1 composite map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.84 Å/pix.
x 360 pix.
= 300.6 Å		0.84 Å/pix.
x 360 pix.
= 300.6 Å		0.84 Å/pix.
x 360 pix.
= 300.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.835 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0025
Minimum - Maximum-0.008047141 - 0.023652297
Average (Standard dev.)0.00002466284 (±0.0008186683)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 300.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Human endogenous FASN with 1,3-DBP

EntireName: Human endogenous FASN with 1,3-DBP
Components
  • Complex: Human endogenous FASN with 1,3-DBP

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Supramolecule #1: Human endogenous FASN with 1,3-DBP

SupramoleculeName: Human endogenous FASN with 1,3-DBP / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 45.8 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 448162
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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