title: Expression pattern of diacylglycerol acyltransferase-1, an enzyme involved in triacylglycerol biosynthesis, in Arabidopsis thaliana.
abstract: Triacylglycerol (TAG) is the major carbon storage reserve in oilseeds such as Arabidopsis. Acyl-CoA:diacylglycerol acyltransferase (DGAT) catalyses the final step of the TAG synthesis pathway. Although TAG is mainly accumulated during seed development, and DGAT has presumably the highest activity in developing seeds, we show here that TAG synthesis is also actively taking place during germination and seedling development in Arabidopsis. The expression pattern of the DGAT1 gene was studied in transgenic plants containing the reporter gene beta-glucuronidase (GUS) fused with DNA sequences flanking the DGAT1 coding region. GUS activity was not only detected in developing seeds and pollen, which normally accumulate storage TAG, but also in germinating seeds and seedlings. Western blots showed that DGAT1 protein is present in several tissues, though is most abundant in developing seeds. In seedlings, DGAT1 is expressed in shoot and root apical regions, correlating with rapid cell division and growth. The expression of GUS in seedlings was consistent with the results of RNA gel blot analyses, precursor feeding and DGAT assay. In addition, DGAT1 gene expression is up-regulated by glucose and associated with glucose-induced changes in seedling development.
authors.affiliation: John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7UH, UK.
authors.forename: Chaofu Lu
authors.initials: CL
authors.lastname: Lu
authors.forename: Shen Bayon
authors.initials: SB
authors.lastname: de Noyer
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Hobbs
authors.forename: Jinling
authors.initials: J
authors.lastname: Kang
authors.forename: Yancheng
authors.initials: Y
authors.lastname: Wen
authors.forename: Dieter
authors.initials: D
authors.lastname: Krachtus
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Hills
mesh_terms: D000217:Acyltransferases / Q000235:genetics* / Q000378:metabolism; D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D001483:Base Sequence; D015152:Blotting, Northern; D018744:DNA, Plant / Q000737:chemistry / Q000235:genetics; D051048:Diacylglycerol O-Acyltransferase; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005947:Glucose / Q000494:pharmacology; D005966:Glucuronidase / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D030821:Plants, Genetically Modified; D011401:Promoter Regions, Genetic / Q000235:genetics; D018749:RNA, Plant / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D014280:Triglycerides / Q000096:biosynthesis*
chemical_list: D018744:DNA, Plant; D018749:RNA, Plant; D011993:Recombinant Fusion Proteins; D014280:Triglycerides; D000217:Acyltransferases; D051048:Diacylglycerol O-Acyltransferase; D005966:Glucuronidase; D005947:Glucose