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Drosophila ABC transporter, DmHMT-1, confers tolerance to cadmium. DmHMT-1 and its yeast homolog, SpHMT-1, are not essential for vacuolar phytochelatin sequestration.

Identifieur interne : 001F86 ( Main/Exploration ); précédent : 001F85; suivant : 001F87

Drosophila ABC transporter, DmHMT-1, confers tolerance to cadmium. DmHMT-1 and its yeast homolog, SpHMT-1, are not essential for vacuolar phytochelatin sequestration.

Auteurs : Thanwalee Sooksa-Nguan [États-Unis] ; Bakhtiyor Yakubov ; Volodymyr I. Kozlovskyy ; Caitlin M. Barkume ; Kevin J. Howe ; Theodore W. Thannhauser ; Michael A. Rutzke ; Jonathan J. Hart ; Leon V. Kochian ; Philip A. Rea ; Olena K. Vatamaniuk

Source :

RBID : pubmed:19001374

Descripteurs français

English descriptors

Abstract

Half-molecule ATP-binding cassette transporters of the HMT-1 (heavy metal tolerance factor 1) subfamily are required for Cd2+ tolerance in Schizosaccharomyces pombe, Caenorhabditis elegans, and Chlamydomonas reinhardtii. Based on studies of S. pombe, it has been proposed that SpHMT-1 transports heavy metal.phytochelatin (PC) complexes into the vacuolysosomal compartment. PCs are glutathione derivatives synthesized by PC synthases (PCS) in plants, fungi, and C. elegans in response to heavy metals. Our previous studies in C. elegans, however, suggested that HMT-1 and PCS-1 do not necessarily act in concert in metal detoxification. To further explore this inconsistency, we have gone on to test whether DmHMT-1, an HMT-1 from a new source, Drosophila, whose genome lacks PCS homologs, functions in heavy metal detoxification. In so doing, we show that heterologously expressed DmHMT-1 suppresses the Cd2+ hypersensitivity of S. pombe hmt-1 mutants and localizes to the vacuolar membrane but does not transport Cd.PC complexes. Crucially, similar analyses of S. pombe hmt-1 mutants extend this finding to show that SpHMT-1 itself either does not transport Cd.PC complexes or is not the principal Cd.PC/apoPC transporter. Consistent with this discovery and with our previous suggestion that HMT-1 and PCS-1 do not operate in a simple linear metal detoxification pathway, we demonstrate that, unlike PCS-deficient cells, which are hypersensitive to several heavy metals, SpHMT-1-deficient cells are hypersensitive to Cd2+, but not to Hg2+ or As3+. These findings significantly change our current understanding of the function of HMT-1 proteins and invoke a PC-independent role for these transporters in Cd2+ detoxification.

DOI: 10.1074/jbc.M806501200
PubMed: 19001374


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<term>Aminoacyltransferases (genetics)</term>
<term>Aminoacyltransferases (metabolism)</term>
<term>Animals (MeSH)</term>
<term>Base Sequence (MeSH)</term>
<term>Biological Transport (drug effects)</term>
<term>Biological Transport (physiology)</term>
<term>Cadmium (pharmacology)</term>
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<term>Drug Resistance, Fungal (physiology)</term>
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<term>Caenorhabditis elegans (métabolisme)</term>
<term>Chlamydomonas reinhardtii (génétique)</term>
<term>Chlamydomonas reinhardtii (métabolisme)</term>
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<term>Phytochélatines (métabolisme)</term>
<term>Protéines de Drosophila (génétique)</term>
<term>Protéines de Drosophila (métabolisme)</term>
<term>Résistance des champignons aux médicaments (effets des médicaments et des substances chimiques)</term>
<term>Résistance des champignons aux médicaments (physiologie)</term>
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<term>Schizosaccharomyces (métabolisme)</term>
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<term>Test de complémentation (MeSH)</term>
<term>Transport biologique (effets des médicaments et des substances chimiques)</term>
<term>Transport biologique (physiologie)</term>
<term>Transporteurs ABC (génétique)</term>
<term>Transporteurs ABC (métabolisme)</term>
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<term>Chlamydomonas reinhardtii</term>
<term>Phytochélatines</term>
<term>Protéines de Drosophila</term>
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<term>Transporteurs ABC</term>
<term>Vacuoles</term>
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<term>Caenorhabditis elegans</term>
<term>Chlamydomonas reinhardtii</term>
<term>Schizosaccharomyces</term>
<term>Vacuoles</term>
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<term>Aminoacyltransferases</term>
<term>Caenorhabditis elegans</term>
<term>Chlamydomonas reinhardtii</term>
<term>Phytochélatines</term>
<term>Protéines de Drosophila</term>
<term>Schizosaccharomyces</term>
<term>Transporteurs ABC</term>
<term>Vacuoles</term>
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<term>Données de séquences moléculaires</term>
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<div type="abstract" xml:lang="en">Half-molecule ATP-binding cassette transporters of the HMT-1 (heavy metal tolerance factor 1) subfamily are required for Cd2+ tolerance in Schizosaccharomyces pombe, Caenorhabditis elegans, and Chlamydomonas reinhardtii. Based on studies of S. pombe, it has been proposed that SpHMT-1 transports heavy metal.phytochelatin (PC) complexes into the vacuolysosomal compartment. PCs are glutathione derivatives synthesized by PC synthases (PCS) in plants, fungi, and C. elegans in response to heavy metals. Our previous studies in C. elegans, however, suggested that HMT-1 and PCS-1 do not necessarily act in concert in metal detoxification. To further explore this inconsistency, we have gone on to test whether DmHMT-1, an HMT-1 from a new source, Drosophila, whose genome lacks PCS homologs, functions in heavy metal detoxification. In so doing, we show that heterologously expressed DmHMT-1 suppresses the Cd2+ hypersensitivity of S. pombe hmt-1 mutants and localizes to the vacuolar membrane but does not transport Cd.PC complexes. Crucially, similar analyses of S. pombe hmt-1 mutants extend this finding to show that SpHMT-1 itself either does not transport Cd.PC complexes or is not the principal Cd.PC/apoPC transporter. Consistent with this discovery and with our previous suggestion that HMT-1 and PCS-1 do not operate in a simple linear metal detoxification pathway, we demonstrate that, unlike PCS-deficient cells, which are hypersensitive to several heavy metals, SpHMT-1-deficient cells are hypersensitive to Cd2+, but not to Hg2+ or As3+. These findings significantly change our current understanding of the function of HMT-1 proteins and invoke a PC-independent role for these transporters in Cd2+ detoxification.</div>
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<DescriptorName UI="D002104" MajorTopicYN="N">Cadmium</DescriptorName>
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</MeshHeading>
<MeshHeading>
<DescriptorName UI="D017173" MajorTopicYN="N">Caenorhabditis elegans</DescriptorName>
<QualifierName UI="Q000235" MajorTopicYN="N">genetics</QualifierName>
<QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName>
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<DescriptorName UI="D016825" MajorTopicYN="N">Chlamydomonas reinhardtii</DescriptorName>
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<DescriptorName UI="D004330" MajorTopicYN="N">Drosophila</DescriptorName>
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<DescriptorName UI="D012568" MajorTopicYN="N">Schizosaccharomyces</DescriptorName>
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<ArticleId IdType="pubmed">19001374</ArticleId>
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<li>États-Unis</li>
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<li>État de New York</li>
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<name sortKey="Barkume, Caitlin M" sort="Barkume, Caitlin M" uniqKey="Barkume C" first="Caitlin M" last="Barkume">Caitlin M. Barkume</name>
<name sortKey="Hart, Jonathan J" sort="Hart, Jonathan J" uniqKey="Hart J" first="Jonathan J" last="Hart">Jonathan J. Hart</name>
<name sortKey="Howe, Kevin J" sort="Howe, Kevin J" uniqKey="Howe K" first="Kevin J" last="Howe">Kevin J. Howe</name>
<name sortKey="Kochian, Leon V" sort="Kochian, Leon V" uniqKey="Kochian L" first="Leon V" last="Kochian">Leon V. Kochian</name>
<name sortKey="Kozlovskyy, Volodymyr I" sort="Kozlovskyy, Volodymyr I" uniqKey="Kozlovskyy V" first="Volodymyr I" last="Kozlovskyy">Volodymyr I. Kozlovskyy</name>
<name sortKey="Rea, Philip A" sort="Rea, Philip A" uniqKey="Rea P" first="Philip A" last="Rea">Philip A. Rea</name>
<name sortKey="Rutzke, Michael A" sort="Rutzke, Michael A" uniqKey="Rutzke M" first="Michael A" last="Rutzke">Michael A. Rutzke</name>
<name sortKey="Thannhauser, Theodore W" sort="Thannhauser, Theodore W" uniqKey="Thannhauser T" first="Theodore W" last="Thannhauser">Theodore W. Thannhauser</name>
<name sortKey="Vatamaniuk, Olena K" sort="Vatamaniuk, Olena K" uniqKey="Vatamaniuk O" first="Olena K" last="Vatamaniuk">Olena K. Vatamaniuk</name>
<name sortKey="Yakubov, Bakhtiyor" sort="Yakubov, Bakhtiyor" uniqKey="Yakubov B" first="Bakhtiyor" last="Yakubov">Bakhtiyor Yakubov</name>
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<name sortKey="Sooksa Nguan, Thanwalee" sort="Sooksa Nguan, Thanwalee" uniqKey="Sooksa Nguan T" first="Thanwalee" last="Sooksa-Nguan">Thanwalee Sooksa-Nguan</name>
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