title: Identification of mitochondrial coenzyme a transporters from maize and Arabidopsis.
abstract: Plants make coenzyme A (CoA) in the cytoplasm but use it for reactions in mitochondria, chloroplasts, and peroxisomes, implying that these organelles have CoA transporters. A plant peroxisomal CoA transporter is already known, but plant mitochondrial or chloroplastic CoA transporters are not. Mitochondrial CoA transporters belonging to the mitochondrial carrier family, however, have been identified in yeast (Saccharomyces cerevisiae; Leu-5p) and mammals (SLC25A42). Comparative genomic analysis indicated that angiosperms have two distinct homologs of these mitochondrial CoA transporters, whereas nonflowering plants have only one. The homologs from maize (Zea mays; GRMZM2G161299 and GRMZM2G420119) and Arabidopsis (Arabidopsis thaliana; At1g14560 and At4g26180) all complemented the growth defect of the yeast leu5Δ mitochondrial CoA carrier mutant and substantially restored its mitochondrial CoA level, confirming that these proteins have CoA transport activity. Dual-import assays with purified pea (Pisum sativum) mitochondria and chloroplasts, and subcellular localization of green fluorescent protein fusions in transiently transformed tobacco (Nicotiana tabacum) Bright Yellow-2 cells, showed that the maize and Arabidopsis proteins are targeted to mitochondria. Consistent with the ubiquitous importance of CoA, the maize and Arabidopsis mitochondrial CoA transporter genes are expressed at similar levels throughout the plant. These data show that representatives of both monocotyledons and eudicotyledons have twin, mitochondrially located mitochondrial carrier family carriers for CoA. The highly conserved nature of these carriers makes possible their reliable annotation in other angiosperm genomes.
authors.affiliation: Microbiology and Cell Science Department , University of Florida, Gainesville, Florida 32611, USA.
authors.forename: Rémi
authors.initials: R
authors.lastname: Zallot
authors.forename: Gennaro
authors.initials: G
authors.lastname: Agrimi
authors.forename: Claudia
authors.initials: C
authors.lastname: Lerma-Ortiz
authors.forename: Howard J
authors.initials: HJ
authors.lastname: Teresinski
authors.forename: Océane
authors.initials: O
authors.lastname: Frelin
authors.forename: Kenneth W
authors.initials: KW
authors.lastname: Ellens
authors.forename: Alessandra
authors.initials: A
authors.lastname: Castegna
authors.forename: Annamaria
authors.initials: A
authors.lastname: Russo
authors.forename: Valérie
authors.initials: V
authors.lastname: de Crécy-Lagard
authors.forename: Robert T
authors.initials: RT
authors.lastname: Mullen
authors.forename: Ferdinando
authors.initials: F
authors.lastname: Palmieri
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Hanson
mesh_terms: D017920:Antiporters / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D002736:Chloroplasts / Q000378:metabolism; D003065:Coenzyme A / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D005816:Genetic Complementation Test; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D008928:Mitochondria / Q000235:genetics / Q000378:metabolism; D024101:Mitochondrial Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D018532:Pisum sativum / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D003313:Zea mays / Q000235:genetics* / Q000378:metabolism
chemical_list: D017920:Antiporters; D029681:Arabidopsis Proteins; C585928:At1g14560 protein, Arabidopsis; C585929:At4g26180 protein, Arabidopsis; D002352:Carrier Proteins; D024101:Mitochondrial Proteins; D010940:Plant Proteins; D029701:Saccharomyces cerevisiae Proteins; D049452:Green Fluorescent Proteins; D003065:Coenzyme A