A mutation of the H-loop selectively affects rhodamine transport by the yeast multidrug ABC transporter Pdr5
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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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The difference between the total and oligomycin-inhibited ATPase assays corresponds to the oligomycin-sensitive ATPase activity of Pdr5.
“The difference of both assays corresponds to the OM-sensitive ATPase activity of Pdr550.”
From Dual action antifungal small molecule modulates multidrug efflux and TOR signaling (2016) · cites this paper as [50]
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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
- Publisher
- National Academy of Sciences
- Published
- 2008-04
- Volume
- 105
- Issue
- 13
- Pages
- 5069-5074
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC2278221
- 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
- green
- www.ncbi.nlm.nih.gov
- 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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