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- EMDB-21481: Cryo-EM structure of human diacylglycerol O-acyltransferase 1 com... -

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Basic information

Entry
Database: EMDB / ID: EMD-21481
TitleCryo-EM structure of human diacylglycerol O-acyltransferase 1 complexed with acyl-CoA substrate
Map dataCryoEM structure of human diacylglycerol O-acyltransferase 1 complexed with acyl-CoA substrate
Sample
  • Complex: human diacylglycerol O-acyltransferase 1
    • Protein or peptide: Diacylglycerol O-acyltransferase 1
  • Ligand: [(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate
  • Ligand: S-{(3R,5R,9R)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-3,5,9-trihydroxy-8,8-dimethyl-3,5-dioxido-10,14-dioxo-2,4,6-trioxa-11,15-diaza-3lambda~5~,5lambda~5~-diphosphaheptadecan-17-yl} (9Z)-octadec-9-enethioate (non-preferred name)
KeywordsTriglyceride Biosynthesis / Lipid Storage / Lipid Metabolism / TRANSFERASE
Function / homology
Function and homology information


retinol O-fatty-acyltransferase / 2-acylglycerol O-acyltransferase activity / retinol O-fatty-acyltransferase activity / monoacylglycerol biosynthetic process / Triglyceride biosynthesis / diacylglycerol metabolic process / Acyl chain remodeling of DAG and TAG / triglyceride biosynthetic process / long-chain fatty-acyl-CoA metabolic process / diacylglycerol O-acyltransferase ...retinol O-fatty-acyltransferase / 2-acylglycerol O-acyltransferase activity / retinol O-fatty-acyltransferase activity / monoacylglycerol biosynthetic process / Triglyceride biosynthesis / diacylglycerol metabolic process / Acyl chain remodeling of DAG and TAG / triglyceride biosynthetic process / long-chain fatty-acyl-CoA metabolic process / diacylglycerol O-acyltransferase / diacylglycerol O-acyltransferase activity / very-low-density lipoprotein particle assembly / lipid storage / triglyceride metabolic process / acyltransferase activity / fatty acid homeostasis / specific granule membrane / Neutrophil degranulation / endoplasmic reticulum membrane / identical protein binding / membrane / plasma membrane
Similarity search - Function
Diacylglycerol O-acyltransferase 1 / Sterol O-acyltransferase, ACAT/DAG/ARE types / Membrane bound O-acyl transferase, MBOAT / MBOAT, membrane-bound O-acyltransferase family
Similarity search - Domain/homology
Diacylglycerol O-acyltransferase 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsSui X / Wang K / Gluchowski N / Liao M / Walther CT
Funding support United States, 4 items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R01GM124348 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)5R01GM097194 United States
American Heart Association18POST34030308 United States
CitationJournal: Nature / Year: 2020
Title: Structure and catalytic mechanism of a human triacylglycerol-synthesis enzyme.
Authors: Xuewu Sui / Kun Wang / Nina L Gluchowski / Shane D Elliott / Maofu Liao / Tobias C Walther / Robert V Farese /
Abstract: Triacylglycerols store metabolic energy in organisms and have industrial uses as foods and fuels. Excessive accumulation of triacylglycerols in humans causes obesity and is associated with metabolic ...Triacylglycerols store metabolic energy in organisms and have industrial uses as foods and fuels. Excessive accumulation of triacylglycerols in humans causes obesity and is associated with metabolic diseases. Triacylglycerol synthesis is catalysed by acyl-CoA diacylglycerol acyltransferase (DGAT) enzymes, the structures and catalytic mechanisms of which remain unknown. Here we determined the structure of dimeric human DGAT1, a member of the membrane-bound O-acyltransferase (MBOAT) family, by cryo-electron microscopy at approximately 3.0 Å resolution. DGAT1 forms a homodimer through N-terminal segments and a hydrophobic interface, with putative active sites within the membrane region. A structure obtained with oleoyl-CoA substrate resolved at approximately 3.2 Å shows that the CoA moiety binds DGAT1 on the cytosolic side and the acyl group lies deep within a hydrophobic channel, positioning the acyl-CoA thioester bond near an invariant catalytic histidine residue. The reaction centre is located inside a large cavity, which opens laterally to the membrane bilayer, providing lipid access to the active site. A lipid-like density-possibly representing an acyl-acceptor molecule-is located within the reaction centre, orthogonal to acyl-CoA. Insights provided by the DGAT1 structures, together with mutagenesis and functional studies, provide the basis for a model of the catalysis of triacylglycerol synthesis by DGAT.
History
DepositionFeb 27, 2020-
Header (metadata) releaseApr 1, 2020-
Map releaseMay 13, 2020-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.056
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.056
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6vz1
  • Surface level: 0.056
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21481.png

Downloads & links

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Map

FileDownload / File: emd_21481.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryoEM structure of human diacylglycerol O-acyltransferase 1 complexed with acyl-CoA substrate
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 256 pix.
= 212.48 Å		0.83 Å/pix.
x 256 pix.
= 212.48 Å		0.83 Å/pix.
x 256 pix.
= 212.48 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.83 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.056 / Movie #1: 0.056
Minimum - Maximum-0.15513524 - 0.2447139
Average (Standard dev.)0.0002447158 (±0.009157711)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 212.48 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.830.830.83
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z212.480212.480212.480
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.1550.2450.000

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Supplemental data

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Sample components

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Entire : human diacylglycerol O-acyltransferase 1

EntireName: human diacylglycerol O-acyltransferase 1
Components
  • Complex: human diacylglycerol O-acyltransferase 1
    • Protein or peptide: Diacylglycerol O-acyltransferase 1
  • Ligand: [(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate
  • Ligand: S-{(3R,5R,9R)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-3,5,9-trihydroxy-8,8-dimethyl-3,5-dioxido-10,14-dioxo-2,4,6-trioxa-11,15-diaza-3lambda~5~,5lambda~5~-diphosphaheptadecan-17-yl} (9Z)-octadec-9-enethioate (non-preferred name)

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Supramolecule #1: human diacylglycerol O-acyltransferase 1

SupramoleculeName: human diacylglycerol O-acyltransferase 1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Details: human diacylglycerol O-acyltransferase 1 complexed with oleoyl-CoA substrate
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Diacylglycerol O-acyltransferase 1

MacromoleculeName: Diacylglycerol O-acyltransferase 1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: diacylglycerol O-acyltransferase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 55.339133 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MGDRGSSRRR RTGSRPSSHG GGGPAAAEEE VRDAAAGPDV GAAGDAPAPA PNKDGDAGVG SGHWELRCHR LQDSLFSSDS GFSNYRGIL NWCVVMLILS NARLFLENLI KYGILVDPIQ VVSLFLKDPY SWPAPCLVIA ANVFAVAAFQ VEKRLAVGAL T EQAGLLLH ...String:
MGDRGSSRRR RTGSRPSSHG GGGPAAAEEE VRDAAAGPDV GAAGDAPAPA PNKDGDAGVG SGHWELRCHR LQDSLFSSDS GFSNYRGIL NWCVVMLILS NARLFLENLI KYGILVDPIQ VVSLFLKDPY SWPAPCLVIA ANVFAVAAFQ VEKRLAVGAL T EQAGLLLH VANLATILCF PAAVVLLVES ITPVGSLLAL MAHTILFLKL FSYRDVNSWC RRARAKAASA GKKASSAAAP HT VSYPDNL TYRDLYYFLF APTLCYELNF PRSPRIRKRF LLRRILEMLF FTQLQVGLIQ QWMVPTIQNS MKPFKDMDYS RII ERLLKL AVPNHLIWLI FFYWLFHSCL NAVAELMQFG DREFYRDWWN SESVTYFWQN WNIPVHKWCI RHFYKPMLRR GSSK WMART GVFLASAFFH EYLVSVPLRM FRLWAFTGMM AQIPLAWFVG RFFQGNYGNA AVWLSLIIGQ PIAVLMYVHD YYVLN YEAP AAEA

UniProtKB: Diacylglycerol O-acyltransferase 1

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Macromolecule #2: [(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyl...

MacromoleculeName: [(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate
type: ligand / ID: 2 / Number of copies: 4 / Formula: 6OU
Molecular weightTheoretical: 717.996 Da
Chemical component information

ChemComp-6OU:
[(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate / phospholipid*YM

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Macromolecule #3: S-{(3R,5R,9R)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydrox...

MacromoleculeName: S-{(3R,5R,9R)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-3,5,9-trihydroxy-8,8-dimethyl-3,5-dioxido-10,14-dioxo-2,4,6-trioxa-11,15-diaza- ...Name: S-{(3R,5R,9R)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-3,5,9-trihydroxy-8,8-dimethyl-3,5-dioxido-10,14-dioxo-2,4,6-trioxa-11,15-diaza-3lambda~5~,5lambda~5~-diphosphaheptadecan-17-yl} (9Z)-octadec-9-enethioate (non-preferred name)
type: ligand / ID: 3 / Number of copies: 2 / Formula: 3VV
Molecular weightTheoretical: 1.03198 KDa
Chemical component information

ChemComp-3VV:
S-{(3R,5R,9R)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-3,5,9-trihydroxy-8,8-dimethyl-3,5-dioxido-10,14-dioxo-2,4,6-trioxa-11,15-diaza-3lambda~5~,5lambda~5~-diphosphaheptadecan-17-yl} (9Z)-octadec-9-enethioate (non-preferred name)

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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

Concentration5 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Instrument: GATAN CRYOPLUNGE 3
DetailsProtein sample was monodisperse.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 43.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 28165
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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