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- EMDB-34644: Structure of human UCP1 in the nucleotide-free state -

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Basic information

Entry
Database: EMDB / ID: EMD-34644
TitleStructure of human UCP1 in the nucleotide-free state
Map dataSharpened full map
Sample
  • Complex: UCP1-sybody complex
    • Protein or peptide: Mitochondrial brown fat uncoupling protein 1
    • Protein or peptide: Sybody 12F2
  • Ligand: CARDIOLIPIN
  • Ligand: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
KeywordsUCP1 / SLC25A7 / thermogenin / SLC25 / MEMBRANE PROTEIN
Function / homology
Function and homology information


purine ribonucleotide binding / cellular response to dehydroepiandrosterone / Mitochondrial Uncoupling / The fatty acid cycling model / oxidative phosphorylation uncoupler activity / mitochondrial transmembrane transport / adaptive thermogenesis / cardiolipin binding / regulation of reactive oxygen species biosynthetic process / cellular response to cold ...purine ribonucleotide binding / cellular response to dehydroepiandrosterone / Mitochondrial Uncoupling / The fatty acid cycling model / oxidative phosphorylation uncoupler activity / mitochondrial transmembrane transport / adaptive thermogenesis / cardiolipin binding / regulation of reactive oxygen species biosynthetic process / cellular response to cold / cellular response to fatty acid / response to temperature stimulus / long-chain fatty acid binding / diet induced thermogenesis / proton transmembrane transporter activity / transmembrane transporter activity / brown fat cell differentiation / Transcriptional regulation of brown and beige adipocyte differentiation by EBF2 / cellular response to hormone stimulus / response to cold / proton transmembrane transport / response to nutrient levels / cellular response to reactive oxygen species / GDP binding / positive regulation of cold-induced thermogenesis / mitochondrial inner membrane / regulation of transcription by RNA polymerase II / GTP binding / mitochondrion
Similarity search - Function
: / Mitochondrial carrier protein / Mitochondrial substrate/solute carrier / Mitochondrial carrier domain superfamily / Mitochondrial carrier protein / Solute carrier (Solcar) repeat profile.
Similarity search - Domain/homology
Mitochondrial brown fat uncoupling protein 1
Similarity search - Component
Biological speciesHomo sapiens (human) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.51 Å
AuthorsChen L / Kang Y
Funding support China, 5 items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2106YFA0502004 China
National Natural Science Foundation of China (NSFC)31622021 China
National Natural Science Foundation of China (NSFC)31821091 China
National Natural Science Foundation of China (NSFC)31870833 China
National Natural Science Foundation of China (NSFC)8200907150 China
CitationJournal: Nature / Year: 2023
Title: Structural basis for the binding of DNP and purine nucleotides onto UCP1.
Authors: Yunlu Kang / Lei Chen /
Abstract: Uncoupling protein 1 (UCP1) conducts protons through the inner mitochondrial membrane to uncouple mitochondrial respiration from ATP production, thereby converting the electrochemical gradient of ...Uncoupling protein 1 (UCP1) conducts protons through the inner mitochondrial membrane to uncouple mitochondrial respiration from ATP production, thereby converting the electrochemical gradient of protons into heat. The activity of UCP1 is activated by endogenous fatty acids and synthetic small molecules, such as 2,4-dinitrophenol (DNP), and is inhibited by purine nucleotides, such as ATP. However, the mechanism by which UCP1 binds to these ligands remains unknown. Here we present the structures of human UCP1 in the nucleotide-free state, the DNP-bound state and the ATP-bound state. The structures show that the central cavity of UCP1 is open to the cytosolic side. DNP binds inside the cavity, making contact with transmembrane helix 2 (TM2) and TM6. ATP binds in the same cavity and induces conformational changes in TM2, together with the inward bending of TM1, TM4, TM5 and TM6 of UCP1, resulting in a more compact structure of UCP1. The binding site of ATP overlaps with that of DNP, suggesting that ATP competitively blocks the functional engagement of DNP, resulting in the inhibition of the proton-conducting activity of UCP1.
History
DepositionOct 31, 2022-
Header (metadata) releaseJun 21, 2023-
Map releaseJun 21, 2023-
UpdateOct 9, 2024-
Current statusOct 9, 2024Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_34644.png

Downloads & links

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Map

FileDownload / File: emd_34644.map.gz / Format: CCP4 / Size: 83.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSharpened full map
Projections & slices

Image control

Size
Brightness
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AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 280 pix.
= 233.52 Å		0.83 Å/pix.
x 280 pix.
= 233.52 Å		0.83 Å/pix.
x 280 pix.
= 233.52 Å

Surface

Projections

Slices (1/3)

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.834 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.03
Minimum - Maximum-6.1811576 - 11.277827
Average (Standard dev.)0.0045588966 (±0.118098386)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions280280280
Spacing280280280
CellA=B=C: 233.52 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_34644_msk_1.map
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Additional map: Unsharpened full map

Fileemd_34644_additional_1.map
AnnotationUnsharpened full map
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Half map: Half map B

Fileemd_34644_half_map_1.map
AnnotationHalf map B
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Histogram

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Half map: Half map A

Fileemd_34644_half_map_2.map
AnnotationHalf map A
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Sample components

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Entire : UCP1-sybody complex

EntireName: UCP1-sybody complex
Components
  • Complex: UCP1-sybody complex
    • Protein or peptide: Mitochondrial brown fat uncoupling protein 1
    • Protein or peptide: Sybody 12F2
  • Ligand: CARDIOLIPIN
  • Ligand: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE

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Supramolecule #1: UCP1-sybody complex

SupramoleculeName: UCP1-sybody complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Mitochondrial brown fat uncoupling protein 1

MacromoleculeName: Mitochondrial brown fat uncoupling protein 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.468367 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MSRLEEELRR RLTEGSGGWS HPQFEKGSGD YKDDDDKGSG WSHPQFEKLE VLFQGPMGGL TASDVHPTLG VQLFSAGIAA CLADVITFP LDTAKVRLQV QGECPTSSVI RYKGVLGTIT AVVKTEGRMK LYSGLPAGLQ RQISSASLRI GLYDTVQEFL T AGKETAPS ...String:
MSRLEEELRR RLTEGSGGWS HPQFEKGSGD YKDDDDKGSG WSHPQFEKLE VLFQGPMGGL TASDVHPTLG VQLFSAGIAA CLADVITFP LDTAKVRLQV QGECPTSSVI RYKGVLGTIT AVVKTEGRMK LYSGLPAGLQ RQISSASLRI GLYDTVQEFL T AGKETAPS LGSKILAGLT TGGVAVFIGQ PTEVVKVRLQ AQSHLHGIKP RYTGTYNAYR IIATTEGLTG LWKGTTPNLM RS VIINCTE LVTYDLMKEA FVKNNILADD VPCHLVSALI AGFCATAMSS PVDVVKTRFI NSPPGQYKSV PNCAMKVFTN EGP TAFFKG LVPSFLRLGS WNVIMFVCFE QLKRELSKSR QTMDCAT

UniProtKB: Mitochondrial brown fat uncoupling protein 1

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Macromolecule #2: Sybody 12F2

MacromoleculeName: Sybody 12F2 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 15.004661 KDa
SequenceString:
MGQVQLVESG GGLVQAGGSL RLSCAASGFP VMYYNMHWYR QAPGKEREWV AAIESTGWWA HYADSVKGRF TISRDNAKNT VYLQMNSLK PEDTAVYYCN VKDFGWRWEA YDYWGQGTQV TVSSLEHHHH HH

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Macromolecule #3: CARDIOLIPIN

MacromoleculeName: CARDIOLIPIN / type: ligand / ID: 3 / Number of copies: 1 / Formula: CDL
Molecular weightTheoretical: 1.464043 KDa
Chemical component information

ChemComp-CDL:
CARDIOLIPIN / phospholipid*YM

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Macromolecule #4: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE

MacromoleculeName: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / type: ligand / ID: 4 / Number of copies: 2 / Formula: PC1
Molecular weightTheoretical: 790.145 Da
Chemical component information

ChemComp-PC1:
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / phospholipid*YM

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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: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 52.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.5 µm

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.51 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 544602
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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