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Title: Crystal structure of the human sterol transporter ABCG5/ABCG8

Journal Article · · Nature (London)
DOI:https://doi.org/10.1038/nature17666· OSTI ID:1255303

ATP binding cassette (ABC) transporters play critical roles in maintaining sterol balance in higher eukaryotes. The ABCG5/ABCG8 heterodimer (G5G8) mediates excretion of neutral sterols in liver and intestines. Mutations disrupting G5G8 cause sitosterolaemia, a disorder characterized by sterol accumulation and premature atherosclerosis. Here we use crystallization in lipid bilayers to determine the X-ray structure of human G5G8 in a nucleotide-free state at 3.9 Å resolution, generating the first atomic model of an ABC sterol transporter. The structure reveals a new transmembrane fold that is present in a large and functionally diverse superfamily of ABC transporters. Here, the transmembrane domains are coupled to the nucleotide-binding sites by networks of interactions that differ between the active and inactive ATPases, reflecting the catalytic asymmetry of the transporter. The G5G8 structure provides a mechanistic framework for understanding sterol transport and the disruptive effects of mutations causing sitosterolaemia.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; American Heart Association South Central Affiliate; American Heart Association Texas Affiliate; Welch Foundation; Packard Foundation; Howard Hughes Medical Inst.; National Inst. of Health
Grant/Contract Number:
AC02-06CH11357; 0825285F; 0463130Y; I-1770; HL72304; P01-HL20948; GM094575; GM053163; GM117080; GM113050
OSTI ID:
1255303
Journal Information:
Nature (London), Vol. 533, Issue 7604; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 199 works
Citation information provided by
Web of Science

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Cited By (50)

Structure of the human multidrug transporter ABCG2 text January 2017
Expression and function of Abcg4 in the mouse blood-brain barrier: role in restricting the brain entry of amyloid-β peptide journal October 2017
Regulation of glucose and lipid metabolism in health and disease journal October 2019
A Newly Integrated Model for Intestinal Cholesterol Absorption and Efflux Reappraises How Plant Sterol Intake Reduces Circulating Cholesterol Levels journal February 2019
The structure of the human ABC transporter ABCG2 reveals a novel mechanism for drug extrusion journal October 2017
Antibiotic Resistance Mediated by the MacB ABC Transporter Family: A Structural and Functional Perspective journal May 2018
Structural biology and structure–function relationships of membrane proteins journal December 2018
Learning the ABCs one at a time: structure and mechanism of ABC transporters journal January 2019
Substrate polyspecificity and conformational relevance in ABC transporters: new insights from structural studies journal December 2018
In vitro NTPase activity of highly purified Pdr5, a major yeast ABC multidrug transporter journal May 2019
Structural basis of small-molecule inhibition of human multidrug transporter ABCG2 journal April 2018
Inferring the Evolutionary History of Your Favorite Protein: A Guide for Molecular Biologists journal April 2019
Residues contributing to drug transport by ABCG2 are localised to multiple drug-binding pockets journal May 2018
The ABCG2 multidrug transporter is a pump gated by a valve and an extracellular lid journal November 2019
Cryo-EM structures of a human ABCG2 mutant trapped in ATP-bound and substrate-bound states journal November 2018
Significance of Cholesterol-Binding Motifs in ABCA1, ABCG1, and SR-B1 Structure journal December 2018
Structure and autoregulation of a P4-ATPase lipid flippase journal June 2019
Crystal structure of tripartite-type ABC transporter MacB from Acinetobacter baumannii. journalarticle January 2017
Mechanisms and regulation of cholesterol homeostasis journal December 2019
Pharmacogenetic Aspects of the Interaction of AT1 Receptor Antagonists With ATP-Binding Cassette Transporter ABCG2 journal May 2018
Split tasks of asymmetric nucleotide‐binding sites in the heterodimeric ABC exporter EfrCD journal April 2017
ABCG5/G8: a structural view to pathophysiology of the hepatobiliary cholesterol secretion journal October 2019
Biophysical Approaches Facilitate Computational Drug Discovery for ATP-Binding Cassette Proteins journal January 2017
Sitosterolemia: Diagnosis, Investigation, and Management journal May 2014
Crystal structure of tripartite-type ABC transporter MacB from Acinetobacter baumannii journal November 2017
Structural basis for antibacterial peptide self‐immunity by the bacterial ABC transporter McjD journal September 2017
Genes Potentially Associated with Familial Hypercholesterolemia journal November 2019
A lipid gating mechanism for the channel-forming O antigen ABC transporter journal February 2019
Structure-function relationships in ABCG2: insights from molecular dynamics simulations and molecular docking studies journal November 2017
All about CDR transporters: Past, present, and future journal October 2018
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ABCG5 and ABCG8: more than a defense against xenosterols journal May 2018
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Structural Biology and Structure–Function Relationships of Membrane Proteins journal March 2021
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