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Moreno A, Banerjee A, Prasad R, Falson P. PDR-like ABC systems in pathogenic fungi. Res Microbiol 2019; 170:417-425. [PMID: 31562919 DOI: 10.1016/j.resmic.2019.09.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 09/12/2019] [Accepted: 09/16/2019] [Indexed: 01/23/2023]
Abstract
ABC transporters of the Pleiotropic Drug Resistance (PDR) family are the main actors of antifungal resistance in pathogenic fungi. While their involvement in clinical resistant strains has been proven, their transport mechanism remains unclear. Notably, one hallmark of PDR transporters is their asymmetry, with one canonical nucleotide-binding site capable of ATP hydrolysis while the other site is not. Recent publications reviewed here show that the so-called "deviant" site is of crucial importance for drug transport and is a step towards alleviating the mystery around the existence of non-catalytic binding sites.
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Affiliation(s)
- Alexis Moreno
- Drug Resistance & Membrane Proteins Group, Molecular Microbiology and Structural Biochemistry Laboratory, CNRS-Lyon 1 University Research Lab n° 5086, Institut de Biologie et Chimie des Protéines, Lyon, France.
| | - Atanu Banerjee
- Amity Institute of Biotechnology and Amity Institute of Integrative Sciences and Health, Amity University Haryana, Gurgaon, India.
| | - Rajendra Prasad
- Amity Institute of Biotechnology and Amity Institute of Integrative Sciences and Health, Amity University Haryana, Gurgaon, India.
| | - Pierre Falson
- Drug Resistance & Membrane Proteins Group, Molecular Microbiology and Structural Biochemistry Laboratory, CNRS-Lyon 1 University Research Lab n° 5086, Institut de Biologie et Chimie des Protéines, Lyon, France.
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2
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Lefèvre F, Boutry M. Towards Identification of the Substrates of ATP-Binding Cassette Transporters. PLANT PHYSIOLOGY 2018; 178:18-39. [PMID: 29987003 PMCID: PMC6130012 DOI: 10.1104/pp.18.00325] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 06/08/2018] [Indexed: 05/05/2023]
Abstract
Most ATP-binding cassette (ABC) proteins function in transmembrane transport, and plant genomes encode a large number of ABC transporters compared with animal or fungal genomes. These transporters have been classified into eight subfamilies according to their topology and phylogenetic relationships. Transgenic plants and mutants with altered ABC transporter expression or function have contributed to deciphering the physiological roles of these proteins, such as in plant development, responses to biotic and abiotic stress, or detoxification activities within the cell. In agreement with the diversity of these functions, a large range of substrates (e.g. hormones and primary and secondary metabolites) have been identified. We review in detail transporters for which substrates have been unambiguously identified. However, some cases are far from clear, because some ABC transporters have the ability to transport several structurally unrelated substrates or because the identification of their substrates was performed indirectly without any flux measurement. Various heterologous or homologous expression systems have been used to better characterize the transport activity and other biochemical properties of ABC transporters, opening the way to addressing new issues such as the particular structural features of plant ABC transporters, the bidirectionality of transport, or the role of posttranslational modifications.
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Affiliation(s)
- François Lefèvre
- Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Marc Boutry
- Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
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3
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Wagner M, Doehl K, Schmitt L. Transmitting the energy: interdomain cross-talk in Pdr5. Biol Chem 2017; 398:145-154. [PMID: 27543784 DOI: 10.1515/hsz-2016-0247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 08/16/2016] [Indexed: 01/24/2023]
Abstract
ABC (ATP-binding cassette) transporters are ubiquitous integral membrane proteins catalyzing the active export or import of structurally and functionally unrelated compounds. In humans, these proteins are clinically and economically important, as their dysfunction is responsible for a number of diseases. In the case of multidrug resistance (MDR) ABC exporters, they particularly confer resistance to a broad spectrum of toxic compounds, placing them in the focus of clinical research. However, ABC-mediated drug resistance is not only restricted to humans. In yeast for example, MDR is called pleiotropic drug resistance (PDR). Important and well-studied members of the PDR subfamily of ABC transporters are Pdr5 from Saccharomyces cerevisiae and its homolog Cdr1 from Candida albicans. Mutational studies of these two transporters provided many insights into the complexity and conceivable mechanism of the interdomain cross-talk that transmits the energy gained from ATP hydrolysis to the substrate translocation process across the membrane. In this review, we summarize and discuss our current knowledge of the interdomain cross-talk as well as new results obtained for asymmetric ABC transporters and derive possible structural and functional implications for Pdr5.
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4
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Nim S, Lobato LG, Moreno A, Chaptal V, Rawal MK, Falson P, Prasad R. Atomic modelling and systematic mutagenesis identify residues in multiple drug binding sites that are essential for drug resistance in the major Candida transporter Cdr1. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2858-2870. [DOI: 10.1016/j.bbamem.2016.08.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 08/15/2016] [Accepted: 08/23/2016] [Indexed: 01/07/2023]
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5
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Knorre DA, Besedina E, Karavaeva IE, Smirnova EA, Markova OV, Severin FF. Alkylrhodamines enhance the toxicity of clotrimazole and benzalkonium chloride by interfering with yeast pleiotropic ABC-transporters. FEMS Yeast Res 2016; 16:fow030. [DOI: 10.1093/femsyr/fow030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2016] [Indexed: 11/13/2022] Open
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6
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Golin J, Ambudkar SV. The multidrug transporter Pdr5 on the 25th anniversary of its discovery: an important model for the study of asymmetric ABC transporters. Biochem J 2015; 467:353-63. [PMID: 25886173 PMCID: PMC4784962 DOI: 10.1042/bj20150042] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Asymmetric ABC (ATP-binding cassette) transporters make up a significant proportion of this important superfamily of integral membrane proteins. These proteins contain one canonical (catalytic) ATP-binding site and a second atypical site with little enzymatic capability. The baker's yeast (Saccharomyces cerevisiae) Pdr5 multidrug transporter is the founding member of the Pdr subfamily of asymmetric ABC transporters, which exist only in fungi and slime moulds. Because these organisms are of considerable medical and agricultural significance, Pdr5 has been studied extensively, as has its medically important homologue Cdr1 from Candida albicans. Genetic and biochemical analyses of Pdr5 have contributed important observations that are likely to be applicable to mammalian asymmetric ABC multidrug transporter proteins, including the basis of transporter promiscuity, the function of the non-catalytic deviant ATP-binding site, the most complete description of an in vivo transmission interface, and the recent discovery that Pdr5 is a molecular diode (one-way gate). In the present review, we discuss the observations made with Pdr5 and compare them with findings from clinically important asymmetric ABC transporters, such as CFTR (cystic fibrosis transmembrane conductance regulator), Cdr1 and Tap1/Tap2.
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Affiliation(s)
- John Golin
- Department of Biology, The Catholic University of America, Washington, DC 20064, U.S.A
| | - Suresh V. Ambudkar
- The Laboratory of Cell Biology, Center for Cancer Research, NCI, NIH, Bethesda, MD 20892, U.S.A
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7
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Prasad R, Rawal MK. Efflux pump proteins in antifungal resistance. Front Pharmacol 2014; 5:202. [PMID: 25221515 PMCID: PMC4148622 DOI: 10.3389/fphar.2014.00202] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 08/13/2014] [Indexed: 11/13/2022] Open
Abstract
It is now well-known that the enhanced expression of ATP binding cassette (ABC) and major facilitator superfamily (MFS) proteins contribute to the development of tolerance to antifungals in yeasts. For example, the azole resistant clinical isolates of the opportunistic human fungal pathogen Candida albicans show an overexpression of Cdr1p and/or CaMdr1p belonging to ABC and MFS superfamilies, respectively. Hence, azole resistant isolates display reduced accumulation of therapeutic drug due to its rapid extrusion and that facilitates its survival. Considering the importance of major antifungal transporters, the focus of recent research has been to understand the structure and function of these proteins to design inhibitors/modulators to block the pump protein activity so that the drug already in use could again sensitize resistant yeast cells. The review focuses on the structure and function of ABC and MFS transporters of Candida to highlight the recent advancement in the field.
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Affiliation(s)
- Rajendra Prasad
- Membrane Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University New Delhi, India
| | - Manpreet K Rawal
- Membrane Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University New Delhi, India
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8
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Kueppers P, Gupta RP, Stindt J, Smits SHJ, Schmitt L. Functional impact of a single mutation within the transmembrane domain of the multidrug ABC transporter Pdr5. Biochemistry 2013; 52:2184-95. [PMID: 23464591 DOI: 10.1021/bi3015778] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The pleiotropic drug resistance network in budding yeast presents a first line of defense against xenobiotics, which is formed by primary and secondary active membrane transporters. Among these transporters, the ABC transporter Pdr5 is a key component, because it confers resistance against a broad spectrum of such cytotoxic agents. Furthermore, it represents a model system for homologous transporters from pathogenic fungi and has been intensively studied in the past. In addition to other mutational studies, the S1360F mutation of Pdr5 was found to modulate substrate specificity and resistance. Notably, in the S1360F background, the resistance against the immunosuppressant FK506 is drastically increased. We present a detailed analysis of this mutation that is located in the predicted cytosolic part of transmembrane helix 11. Our data demonstrate that kinetic and thermodynamic parameters of the S1360F mutant are similar to those of the wild-type protein, except for FK506-inhibited ATPase activity and the degree of competitive inhibition. In summary, our results indicate that the S1360F mutation within the transmembrane domain interferes drastically with the ability of the nucleotide-binding domains to hydrolyze ATP by interfering with interdomain crosstalk.
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Affiliation(s)
- Petra Kueppers
- Institute of Biochemistry, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225 Duesseldorf, Germany
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9
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Akiyama K, Iwaki T, Sugimoto N, Chardwiriyapreecha S, Kawano M, Nishimoto S, Sugahara T, Sekito T, Kakinuma Y. Bfr1p is responsible for tributyltin resistance in Schizosaccharomyces pombe. J Toxicol Sci 2011; 36:117-20. [PMID: 21297349 DOI: 10.2131/jts.36.117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
ATP-binding cassette (ABC) transporter plays an important role for resistance against xenobiotics. There are eleven ABC transporter genes in the genome of fission yeast Schizosaccharomyces pombe. We examined the role of ABC transporter against the toxicity of tributyltin chloride (TBT), a widespread environmental pollutant, in cell growth. Among individual ABC transporter mutants, the growth of a mutant deficient in Bfr1p, a plasma membrane-embedded transporter, was extremely sensitive to TBT. The lethal TBT concentration inducing 50% of cell death (LC(50)) was 25 µM for the parent strain and 10.2 µM for the bfr1∆ mutant. Thus, Bfr1p was responsible for TBT resistance in S. pombe.
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10
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Analysis of physico-chemical properties of substrates of ABC and MFS multidrug transporters of pathogenic Candida albicans. Eur J Med Chem 2010; 45:4813-26. [DOI: 10.1016/j.ejmech.2010.07.050] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 07/20/2010] [Accepted: 07/27/2010] [Indexed: 01/30/2023]
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11
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Pereira Rangel L, Fritzen M, Yunes RA, Leal PC, Creczynski-Pasa TB, Ferreira-Pereira A. Inhibitory effects of gallic acid ester derivatives onSaccharomyces cerevisiaemultidrug resistance protein Pdr5p. FEMS Yeast Res 2010. [DOI: 10.1111/j.1567-1364.2009.00603.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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12
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Chahomchuen T, Akiyama K, Sekito T, Sugimoto N, Okabe M, Nishimoto S, Sugahara T, Kakinuma Y. Tributyltin induces Yca1p-dependent cell death of yeast Saccharomyces cerevisiae. J Toxicol Sci 2010; 34:541-5. [PMID: 19797862 DOI: 10.2131/jts.34.541] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Tributyltin chloride (TBT), an environmental pollutant, is toxic to a variety of eukaryotic and prokaryotic organisms. Although it has been reported that TBT induces apoptotic cell death in mammalian, the action of TBT on eukaryotic microorganisms has not yet been fully investigated. In this study we examined the mechanism involved in cell death caused by TBT exposure in Saccharomyces cerevisiae. The median lethal concentration of TBT was 10 microM for the parent strain BY4741 and 3 microM for the pdr5Delta mutant defective in a major multidrug transporter, respectively. Fluorescence microscopic observations revealed nuclear condensation and chromatin fragmentation in cells treated with TBT indicating that cells underwent an apoptosis-like cell dearth. TBT-induced cell death was suppressed by deletion of the yca1 gene encoding a homologue of the mammalian caspase. In parallel, reactive oxygen species (ROS) were produced by TBT. These results suggest that TBT induces apoptosis-like cell death in yeast via an Yca1p-dependent pathway possibly downstream of the ROS production. This is the first report on TBT-induced apoptotic cell death in yeast.
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13
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Pereira Rangel L, Fritzen M, Yunes RA, Leal PC, Creczynski-Pasa TB, Ferreira-Pereira A. Inhibitory effects of gallic acid ester derivatives on Saccharomyces cerevisiae multidrug resistance protein Pdr5p. FEMS Yeast Res 2010; 10:244-51. [PMID: 20132313 DOI: 10.1111/j.1567-1364.2010.00603.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Overexpression of the Saccharomyces cerevisiae ABC transporter Pdr5p confers resistance to a range of structurally unrelated xenobiotics. This property allows Pdr5p to be used as a target for novel multidrug resistance reversal reagents or chemosensitizers. Herein, we report the effects of gallic acid derivatives with substitutions either on the ester moiety or in the benzene ring on the activity of Pdr5p. Compounds with a longer side chain (8-16 carbons) resulted in greater inhibition of Pdr5p ATPase. Derivatives with side chains of 8-12 carbons that retained hydroxyl groups on the benzene ring extensively inhibited Pdr5p ATPase activity. These compounds almost completely inhibited the efflux of the Pdr5p fluorescent substrate Rhodamine 6G and at 25 muM chemosensitized the Pdr5p-overexpressing strain AD124567 to fluconazole (0.4 mg mL(-1)). Gallic acid derivatives may be a new class of Pdr5p inhibitors.
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Affiliation(s)
- Luciana Pereira Rangel
- Laboratório de Bioquímica Microbiana, Departamento de Microbiologia Geral/IMPPG, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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14
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Porcelli F, Triggiani D, Buck-Koehntop BA, Masterson LR, Veglia G. Pseudoenzymatic dealkylation of alkyltins by biological dithiols. J Biol Inorg Chem 2009; 14:1219-25. [PMID: 19626349 DOI: 10.1007/s00775-009-0565-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2009] [Accepted: 06/30/2009] [Indexed: 11/24/2022]
Abstract
We investigated the time dependence of the degradation of three alkyltin derivatives by a nine amino acid linear peptide (I(1)LGCWCYLR(9)) containing a CXC motif derived from the primary sequence of stannin, a membrane protein involved in alkyltin toxicity. We monitored the reaction kinetics using the intrinsic fluorescence of the tryptophan residue in position 5 of the peptide and found that all of the alkyltins analyzed are progressively degraded to dialkyl derivatives, following a pseudoenzymatic reaction mechanism. The end point of the reactions is the formation of a covalent complex between the disubstituted alkyltin and the peptide cysteines. These data agree with the speciation profiles proposed for polysubstituted alkyltins in the environment and reveal a possible biotic degradation pathway for these toxic compounds.
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Affiliation(s)
- Fernando Porcelli
- Department of Environmental Science, University of Tuscia, 01100 Viterbo, Italy
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15
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Kingtong S, Chitramvong Y, Janvilisri T. ATP-binding cassette multidrug transporters in Indian-rock oyster Saccostrea forskali and their role in the export of an environmental organic pollutant tributyltin. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2007; 85:124-32. [PMID: 17889379 DOI: 10.1016/j.aquatox.2007.08.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2007] [Revised: 08/13/2007] [Accepted: 08/14/2007] [Indexed: 05/17/2023]
Abstract
ATP-binding cassette (ABC) multidrug transporters confer resistance in human cancer cells as well as in pathogenic microorganisms by mediating the extrusion of various chemotherapeutic drugs out of the cell. In aquatic invertebrates, the presence of ABC transporters which are involved in the multi-xenobiotic resistance has been demonstrated. However, most studies have been confined to the MDR1 subfamily. In the present study, we characterized the expression and localization of the ABC multidrug transporters including MDR1, MRP1 and BCRP subfamily in the Indian-rock oyster Saccostrea forskali. To our knowledge, these data represent one of the first reports on the orthologues of MRP1 and BCRP in marine invertebrates. Furthermore, the observations of (i) the expression of the ABC multidrug proteins in detoxifying tissues; (ii) the induction of these transporters upon exposure to an environmental organic pollutant tributyltin (TBT); and (iii) the concentration-dependent inhibition of rhodamine efflux by TBT imply a possible role of these proteins in the export of TBT. Our findings along with previous studies suggest that the ABC multidrug transporters act as a detoxifying mechanism of various toxic agents including TBT in aquatic organisms.
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Affiliation(s)
- Sutin Kingtong
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand
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16
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de Thozée CP, Cronin S, Goj A, Golin J, Ghislain M. Subcellular trafficking of the yeast plasma membrane ABC transporter, Pdr5, is impaired by a mutation in the N-terminal nucleotide-binding fold. Mol Microbiol 2007; 63:811-25. [PMID: 17302805 DOI: 10.1111/j.1365-2958.2006.05562.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The plasma membrane ATP-binding cassette (ABC) transporter, Pdr5p, mediates resistance to many different xenobiotic compounds in yeast. We have isolated several mutated forms that fail to confer resistance to cycloheximide and itraconazole. Here, we examined two variants, the expression of which was abnormally low when cells reach the stationary phase of growth. The Pdr5(1157) variant lacked the C-terminal transmembrane domain due to the presence of a nonsense mutation at codon 1158. The second variant, Pdr5(L183P), contained a Leu183Pro substitution close to the Walker A motif in the N-terminal nucleotide-binding domain. This substitution impaired UTPase activity as well as protein stability. The Pdr5(L183P) variant induced the unfolded protein response and was targeted to the proteasome for degradation. Fluorescence microscopy showed that the highly unstable Pdr5(L183P) was mislocalized to endoplasmic reticulum (ER)-associated compartments, whereas the truncated Pdr5(1157) protein was retained in the ER. When threonine 363 (located in the first nucleotide-binding domain, close to the Walker B motif) in Pdr5(L183P) was replaced with isoleucine, this double mutant conferred partial drug resistance. These results suggest that Pdr5p requires a properly folded nucleotide-binding domain for trafficking to the plasma membrane.
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Affiliation(s)
- Cédric Pety de Thozée
- Unité de biochimie physiologique, Institut des sciences de la vie, Université catholique de Louvain, Croix du Sud 5-15, B-1348 Louvain-la-Neuve, Belgium
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17
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Golin J, Ambudkar SV, May L. The yeast Pdr5p multidrug transporter: How does it recognize so many substrates? Biochem Biophys Res Commun 2007; 356:1-5. [PMID: 17316560 DOI: 10.1016/j.bbrc.2007.02.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2007] [Accepted: 02/02/2007] [Indexed: 11/19/2022]
Abstract
Multidrug transporters are of considerable importance because they present problems in the treatment of infectious disease and cancer. A central issue is the ability of efflux pumps to recognize an astounding array of structurally diverse compounds. The yeast Pdr5p efflux pump, which is a member of the ATP-binding cassette superfamily, has at least 3 substrate-binding sites, each of which appears to use different chemical properties to transport compounds. All Pdr5p substrates, however, have a size requirement that is independent of hydrophobicity.
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Affiliation(s)
- John Golin
- Department of Biology, The Catholic University of America, Washington, DC 20064, USA.
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18
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Sugiyama A, Shitan N, Sato S, Nakamura Y, Tabata S, Yazaki K. Genome-wide analysis of ATP-binding cassette (ABC) proteins in a model legume plant, Lotus japonicus: comparison with Arabidopsis ABC protein family. DNA Res 2006; 13:205-28. [PMID: 17164256 DOI: 10.1093/dnares/dsl013] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
ATP-binding cassette (ABC) proteins constitute a large family in plants with more than 120 members each in Arabidopsis and rice, and have various functions including the transport of auxin and alkaloid, as well as the regulation of stomata movement. In this report, we carried out genome-wide analysis of ABC protein genes in a model legume plant, Lotus japonicus. For analysis of the Lotus genome sequence, we devised a new method 'domain-based clustering analysis', where domain structures like the nucleotide-binding domain (NBD) and transmembrane domain (TMD), instead of full-length amino acid sequences, are used to compare phylogenetically each other. This method enabled us to characterize fragments of ABC proteins, which frequently appear in a draft sequence of the Lotus genome. We identified 91 putative ABC proteins in L. japonicus, i.e. 43 'full-size', 40 'half-size' and 18 'soluble' putative ABC proteins. The characteristic feature of the composition is that Lotus has extraordinarily many paralogs similar to AtMRP14 and AtPDR12, which are at least six and five members, respectively. Expression analysis of the latter genes performed with real-time quantitative reverse transcription-PCR revealed their putative involvement in the nodulation process.
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Affiliation(s)
- Akifumi Sugiyama
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere Kyoto University, Gokasho, Uji 611-0011, Japan
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19
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Hanson L, May L, Tuma P, Keeven J, Mehl P, Ferenz M, Ambudkar SV, Golin J. The role of hydrogen bond acceptor groups in the interaction of substrates with Pdr5p, a major yeast drug transporter. Biochemistry 2005; 44:9703-13. [PMID: 16008355 DOI: 10.1021/bi0502994] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The yeast ABC (ATP-binding cassette protein) multidrug transporter Pdr5p transports a broad spectrum of xenobiotic compounds, including antifungal and antitumor agents. Previously, we demonstrated that substrate size is an important factor in substrate-transporter interaction and that Pdr5p has at least three substrate-binding sites. In this study, we use a combination of whole cell transport assays and photoaffinity labeling of Pdr5p with [(125)I]iodoarylazidoprazosin in purified plasma membrane vesicles to study the behavior of two series of novel substrates: trityl (triphenylmethyl) and carbazole derivatives. The results indicate that site 2, defined initially by tritylimidazole efflux, requires at least a single hydrogen bond acceptor group (electron pair donor). In contrast, complete inhibition of rhodamine 6G efflux and [(125)I]iodoarylazidoprazosin binding at site 1 requires substrates with three electronegative groups. Carbazole and trityl substrates with two groups show saturating, incomplete inhibition at this site. This type of inhibition is frequently observed in bacterial multidrug-binding proteins that use a pocket with multiple binding sites. The presence of multiple sites with different requirements for substrate-Pdr5p interaction may explain the broad specificity of xenobiotic compounds transported by this protein.
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Affiliation(s)
- Leanne Hanson
- Department of Biology, The Catholic University of America, Washington, DC 20064, USA
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20
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Tutulan-Cunita AC, Mikoshi M, Mizunuma M, Hirata D, Miyakawa T. Mutational analysis of the yeast multidrug resistance ABC transporter Pdr5p with altered drug specificity. Genes Cells 2005; 10:409-20. [PMID: 15836770 DOI: 10.1111/j.1365-2443.2005.00847.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Multidrug resistance ABC transporter Pdr5p of Saccharomyces cerevisiae is particularly important due to its ability to export a wide range of unrelated substrates. To clarify its function, we generated Pdr5p mutants by random mutagenesis and screened for mutants with altered drug specificity in vivo by using 5 drug compounds. Nine point mutations that caused significant changes in drug specificity distributed throughout the length of Pdr5p, namely, in the extracellular, transmembrane or cytoplasmic regions of the transporter. We then investigated their effects upon drug resistance, using 36 chemically related or distinct substrates. From this study, overall geometry of the Pdr5p was suggested to contribute in acquiring the enormous range of drug specificity. Based on their ability to inhibit the growth of the mutant strains, the 36 tested drugs were classified into: drugs to which the mutants responded differently (Group 1), drugs to which all the mutants showed sensitivity (Group 2), and drugs to which all the mutants exhibited resistance (Group 3). The ability of the compounds to be partitioned to the plasma membrane seemed an important factor for recognition by Pdr5p.
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Affiliation(s)
- Andreea Cristina Tutulan-Cunita
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
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21
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Song X, Zapata A, May L, Eng G. Effects of pH on the speciation of several triorganotin compounds in Anacostia River sediments using Mössbauer spectroscopy. MAIN GROUP CHEMISTRY 2005. [DOI: 10.1080/10241220500045929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Golin J, Ambudkar SV, Gottesman MM, Habib AD, Sczepanski J, Ziccardi W, May L. Studies with novel Pdr5p substrates demonstrate a strong size dependence for xenobiotic efflux. J Biol Chem 2003; 278:5963-9. [PMID: 12496287 DOI: 10.1074/jbc.m210908200] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The yeast (Saccharomyces cerevisiae) multidrug transporter Pdr5p effluxes a broad range of substrates that are variable in structure and mode of action. Previous work suggested that molecular size and ionization could be important parameters. In this study, we compared the relative sensitivity of isogenic PDR5 and pdr5 strains toward putative substrates that are similar in chemical structure. Three series were used: imidazole-containing compounds, trialkyltin chlorides, and tetraalkyltin compounds. We demonstrate that the Pdr5p transporter is capable of mediating transport of substrates that neither ionize nor have electron pair donors and that are much simpler in structure than those transported by the human MDR1-encoded P-glycoprotein. Furthermore, the size of the substrate is critical and independent of any requirement for hydrophobicity. Substrates have surface volumes greater than 90 A(3) with an optimum response at approximately 200-225 A(3) as determined by molecular modeling. Assays measuring the efflux from cells of [(3)H]chloramphenicol and [(3)H]tritylimidazole were used. A concentration-dependent inhibition of chloramphenicol transport was observed with imidazole derivatives but not with either the organotin compounds or the antitumor agent doxorubicin. In contrast, several of the organotin compounds were potent inhibitors of tritylimidazole efflux, but the Pdr5p substrate tetrapropyltin was ineffective in both assays. This argues for the existence of at least three substrate-binding sites on Pdr5p that differ in behavior from those of the mammalian P-glycoprotein. Evidence also indicates that some substrates are capable of interacting at more than one site. The surprising observation that Pdr5p mediates resistance to tetraalkyltins suggests that one of the sites might use only hydrophobic interactions to bind substrates.
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Affiliation(s)
- John Golin
- Department of Biology and Chemistry, Catholic University of America, Washington, DC 20064, USA
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Eng G, Song X, Duong Q, Strickman D, Glass J, May L. Synthesis, structure characterization and insecticidal activity of some triorganotin dithiocarbamates. Appl Organomet Chem 2003. [DOI: 10.1002/aoc.423] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Wada SI, Niimi M, Niimi K, Holmes AR, Monk BC, Cannon RD, Uehara Y. Candida glabrata ATP-binding cassette transporters Cdr1p and Pdh1p expressed in a Saccharomyces cerevisiae strain deficient in membrane transporters show phosphorylation-dependent pumping properties. J Biol Chem 2002; 277:46809-21. [PMID: 12244114 DOI: 10.1074/jbc.m207817200] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The expression and drug efflux activity of the ATP binding cassette transporters Cdr1p and Pdh1p are thought to have contributed to the recent increase in the number of fungal infections caused by Candida glabrata. The function of these transporters and their pumping characteristics, however, remain ill defined. We have evaluated the function of Cdr1p and Pdh1p through their heterologous hyperexpression in a Saccharomyces cerevisiae strain deleted in seven major drug efflux transporters to minimize the background drug efflux activity. Although both Cdr1p- and Pdh1p-expressing strains CDR1-AD and PDH1-AD acquired multiple resistances to structurally unrelated compounds, CDR1-AD showed, in most cases, higher levels of resistance than PDH1-AD. CDR1-AD also showed greater rhodamine 6G efflux and resistance to pump inhibitors, although plasma membrane fractions had comparable NTPase activities. These results indicate that Cdr1p makes a larger contribution than Phd1p to the reduced susceptibility of C. glabrata to xenobiotics. Both pump proteins were phosphorylated in a glucose-dependent manner. Whereas the phosphorylation of Cdr1p affected its NTPase activity, the protein kinase A-mediated phosphorylation of Pdh1p, which was necessary for drug efflux, did not. This suggests that phosphorylation of Pdh1p may be required for efficient coupling of NTPase activity with drug efflux.
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Affiliation(s)
- Shun-Ichi Wada
- Department of Bioactive Molecules, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
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