Cited by 146Drug Transport and Resistance MechanismsATP Synthase and ATPases ResearchAntibiotic Resistance in Bacteria

A mutation of the H-loop selectively affects rhodamine transport by the yeast multidrug ABC transporter Pdr5

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Ernst, Robert, Kueppers, Petra, Klein, Cornelia M., Schwarzmueller, Tobias, Kuchler, Karl, Schmitt, Lutz·2008·Proceedings of the National Academy of Sciences

Abstract

The yeast ABC transporter Pdr5 plays a major role in drug resistance against a large number of structurally unrelated compounds. Although Pdr5 has been extensively studied, many important aspects regarding its molecular mechanisms remain unresolved. For example, a striking degeneration of conserved amino acid residues exists in the nucleotide binding domains (NBDs), but their functional relevance is unknown. Here, we performed in vivo and in vitro experiments to address the functional asymmetry of NBDs. It became evident by ATPase activity and drug transport studies that catalysis at only one of the two NBD composite sites is crucial for protein function. Furthermore, mutations of the proposed “catalytic carboxylate” (E1036) and the “catalytic dyad histidine” (H1068) were characterized. Although a mutation of the glutamate abolished ATPase activity and substrate transport, mutation of H1068 had no influence on ATP consumption. However, the H1068A mutation abolished rhodamine transport in vivo and in vitro , while leaving the transport of other substrates unaffected. By contrast to mammalian P-glycoprotein (P-gp), the ATPase activity of yeast Pdr5 is not stimulated by the addition of substrates, indicating that Pdr5 is an uncoupled ABC transporter that constantly hydrolyses ATP to ensure active substrate transport. Taken together, our data provide important insights into the molecular mechanism of Pdr5 and suggest that not solely the transmembrane domains dictate substrate selection.

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Crossref · 10.1073/pnas.0800191105

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Authors
Ernst, R., Kueppers, P., Klein, C. M., Schwarzmueller, T., Kuchler, K., & Schmitt, L.
Affiliations
  • Heinrich Heine University Düsseldorf (DE)
  • Max Perutz Labs (AT)
  • Max F. Perutz Laboratories, Medical University Vienna, Campus Vienna Biocenter, Dr. Bohr-Gasse 9/2, A-1030 Vienna, Austria
Venue
Proceedings of the National Academy of Sciences
Published
2008-04
Volume
105
Issue
13
Pages
5069-5074
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1964828092
Cited by
146
References
41
Citations by year
2026: 4 · 2025: 4 · 2024: 4 · 2023: 4 · 2022: 7 · 2021: 6 · 2020: 9 · 2019: 12 · 2018: 6 · 2017: 11 · 2016: 8 · 2015: 5 · 2014: 11 · 2013: 10 · 2012: 8
FWCI
6.52
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
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 Medicine › Antibiotic Resistance in Bacteria
Keywords
PDR5, ABC transporters, multidrug resistance, nucleotide-binding domain, ATPase activity, substrate selection
MeSH terms
Adenosine Triphosphatases, Cell Membrane, Hydrolysis, Mutation, Phenotype, Rhodamines, Saccharomyces cerevisiae, Gene Expression Regulation, Fungal, Sequence Alignment, Conserved Sequence, ATP-Binding Cassette Transporters, Amino Acid Motifs, Saccharomyces cerevisiae Proteins

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