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- PDB-7r8c: The structure of human ABCG1 -

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Basic information

Entry
Database: PDB / ID: 7r8c
TitleThe structure of human ABCG1
ComponentsIsoform 4 of ATP-binding cassette sub-family G member 1
KeywordsLIPID TRANSPORT / sterol / lipids / ABC transporter
Function / homology
Function and homology information


ABC-type sterol transporter activity / glycoprotein transport / cellular response to high density lipoprotein particle stimulus / intracellular cholesterol transport / toxin transmembrane transporter activity / ABC transporters in lipid homeostasis / floppase activity / positive regulation of cholesterol biosynthetic process / phosphatidylcholine floppase activity / phospholipid homeostasis ...ABC-type sterol transporter activity / glycoprotein transport / cellular response to high density lipoprotein particle stimulus / intracellular cholesterol transport / toxin transmembrane transporter activity / ABC transporters in lipid homeostasis / floppase activity / positive regulation of cholesterol biosynthetic process / phosphatidylcholine floppase activity / phospholipid homeostasis / high-density lipoprotein particle remodeling / phospholipid efflux / cholesterol transfer activity / reverse cholesterol transport / low-density lipoprotein particle remodeling / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / HDL remodeling / cholesterol efflux / regulation of cholesterol metabolic process / cholesterol binding / positive regulation of amyloid-beta formation / response to lipid / negative regulation of cholesterol storage / amyloid precursor protein catabolic process / negative regulation of macrophage derived foam cell differentiation / positive regulation of cholesterol efflux / NR1H3 & NR1H2 regulate gene expression linked to cholesterol transport and efflux / cholesterol metabolic process / cholesterol homeostasis / positive regulation of protein secretion / ADP binding / transmembrane transport / recycling endosome / phospholipid binding / endosome / protein heterodimerization activity / Golgi membrane / external side of plasma membrane / endoplasmic reticulum membrane / Golgi apparatus / protein homodimerization activity / ATP hydrolysis activity / mitochondrion / ATP binding / plasma membrane
Similarity search - Function
Pigment precursor permease/Protein ATP-binding cassette sub-family G / ABC transporter family G domain / ABC-2 type transporter / : / ABC-2 type transporter / ABC-2 type transporter / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain ...Pigment precursor permease/Protein ATP-binding cassette sub-family G / ABC transporter family G domain / ABC-2 type transporter / : / ABC-2 type transporter / ABC-2 type transporter / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ATP-binding cassette sub-family G member 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsSun, Y. / Li, X. / Long, T.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
Welch Foundation United States
Damon Runyon Cancer Research Foundation United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2021
Title: Molecular basis of cholesterol efflux via ABCG subfamily transporters.
Authors: Yingyuan Sun / Jin Wang / Tao Long / Xiaofeng Qi / Linda Donnelly / Nadia Elghobashi-Meinhardt / Leticia Esparza / Jonathan C Cohen / Xiao-Song Xie / Helen H Hobbs / Xiaochun Li /
Abstract: The ABCG1 homodimer (G1) and ABCG5-ABCG8 heterodimer (G5G8), two members of the adenosine triphosphate (ATP)-binding cassette (ABC) transporter G family, are required for maintenance of cellular ...The ABCG1 homodimer (G1) and ABCG5-ABCG8 heterodimer (G5G8), two members of the adenosine triphosphate (ATP)-binding cassette (ABC) transporter G family, are required for maintenance of cellular cholesterol levels. G5G8 mediates secretion of neutral sterols into bile and the gut lumen, whereas G1 transports cholesterol from macrophages to high-density lipoproteins (HDLs). The mechanisms used by G5G8 and G1 to recognize and export sterols remain unclear. Here, we report cryoelectron microscopy (cryo-EM) structures of human G5G8 in sterol-bound and human G1 in cholesterol- and ATP-bound states. Both transporters have a sterol-binding site that is accessible from the cytosolic leaflet. A second site is present midway through the transmembrane domains of G5G8. The Walker A motif of G8 adopts a unique conformation that accounts for the marked asymmetry in ATPase activities between the two nucleotide-binding sites of G5G8. These structures, along with functional validation studies, provide a mechanistic framework for understanding cholesterol efflux via ABC transporters.
History
DepositionJun 26, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 8, 2021Provider: repository / Type: Initial release

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Assembly

Deposited unit
A: Isoform 4 of ATP-binding cassette sub-family G member 1
B: Isoform 4 of ATP-binding cassette sub-family G member 1


Theoretical massNumber of molelcules
Total (without water)148,4582
Polymers148,4582
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Isoform 4 of ATP-binding cassette sub-family G member 1 / ATP-binding cassette transporter 8 / White protein homolog


Mass: 74228.984 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ABCG1, ABC8, WHT1 / Production host: Homo sapiens (human)
References: UniProt: P45844, Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate

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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: ABCG1 transporter with cholesterol bound / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.15 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenConc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Added 8mM ATP, Magnesium and 0.2mg/ml cholesterol in ethanol
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 293 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / C2 aperture diameter: 70 µm
Image recordingAverage exposure time: 1.8 sec. / Electron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 4900

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 987532
3D reconstructionResolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 545471 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0028716
ELECTRON MICROSCOPYf_angle_d0.42211780
ELECTRON MICROSCOPYf_dihedral_angle_d30.6231188
ELECTRON MICROSCOPYf_chiral_restr0.0371354
ELECTRON MICROSCOPYf_plane_restr0.0031476

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