Cited by 53Drug Transport and Resistance MechanismsATP Synthase and ATPases ResearchRetinal Development and Disorders

Molecular Organization and ATP-Induced Conformational Changes of ABCA4, the Photoreceptor-Specific ABC Transporter

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Tsybovsky, Yaroslav, Orban, Tivadar, Molday, Robert S., Taylor, Derek, Palczewski, Krzysztof·2013·Structure

Abstract

ATP-binding cassette (ABC) transporters use ATP to translocate various substrates across cellular membranes. Several members of subfamily A of mammalian ABC transporters are associated with severe health disorders, but their unusual complexity and large size have so far precluded structural characterization. ABCA4 is localized to the discs of vertebrate photoreceptor outer segments. This protein transports N-retinylidene-phosphatidylethanolamine to the outer side of disc membranes to prevent formation of toxic compounds causing macular degeneration. An 18 Å-resolution structure of ABCA4 isolated from bovine rod outer segments was determined using electron microscopy and single-particle reconstruction. Significant conformational changes in the cytoplasmic and transmembrane regions were observed upon binding of a nonhydrolyzable ATP analog and accompanied by altered hydrogen/deuterium exchange in the Walker A motif of one of the nucleotide-binding domains. These findings provide an initial view of the molecular organization and functional rearrangements for any member of the ABCA subfamily of ABC transporters.

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Crossref · 10.1016/j.str.2013.03.001

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  • The structure of native bovine ABCA4 was determined by negative stain electron microscopy to 18 Å resolution.

    “The structure of native bovine ABCA4 has been determined by negative stain electron microscopy to a resolution of 18 Å, revealing the overall shape of the molecule.523”

    From Chemistry of the Retinoid (Visual) Cycle (2014) · cites this paper as [523]

  • Conformational changes in ABCA4 have been observed by electron microscopy and hydrogen-deuterium exchange.

    “Such conformational changes have indeed been observed by electron microscopy and hydrogen–deuterium exchange.523”

    From Chemistry of the Retinoid (Visual) Cycle (2014) · cites this paper as [523]

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Authors
Tsybovsky, Y., Orban, T., Molday, R. S., Taylor, D., & Palczewski, K.
Affiliations
  • Case Western Reserve University (US)
  • University of British Columbia (CA)
Corresponding author
  • Tsybovsky, Yaroslav
  • Palczewski, Krzysztof
Venue
Structure
Publisher
Elsevier BV
Published
2013-05
Volume
21
Issue
5
Pages
854-860
ISSN
0969-2126 (ISSN-L)
OpenAlex
W2154057556
Cited by
53
References
50
Citations by year
2025: 1 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 9 · 2020: 5 · 2019: 3 · 2018: 4 · 2017: 5 · 2016: 3 · 2015: 4 · 2014: 10 · 2013: 5
FWCI
3.93
Type
journal article
Language
en
Open access
Locations
  • Structure (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Canada Research Chairs
  • National Eye Institute (EY021126, EY009339, R24EY021126, EY002422, R01EY002422, R01EY009339)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
Keywords
ABCA4, ABC transporters, photoreceptor outer segments, macular degeneration, transporter structure, conformational change, nonhydrolyzable ATP analog, Walker A motif, hydrogen-deuterium exchange, rod outer segments
MeSH terms
Adenosine Triphosphate, Amino Acid Sequence, Animals, Cattle, Hydrolysis, Molecular Sequence Data, Rod Cell Outer Segment, Protein Structure, Tertiary, ATP-Binding Cassette Transporters

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