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Martins-Noguerol R, Acket S, Troncoso-Ponce MA, Garcés R, Venegas-Calerón M, Salas JJ, Martínez-Force E, Moreno-Pérez AJ. Characterization and impact of sunflower plastidial octanoyltransferases (Helianthus annuus L.) on oil composition. JOURNAL OF PLANT PHYSIOLOGY 2022; 274:153730. [PMID: 35623270 DOI: 10.1016/j.jplph.2022.153730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 05/11/2022] [Accepted: 05/18/2022] [Indexed: 06/15/2023]
Abstract
Prosthetic lipoyl groups are essential for the metabolic activity of several multienzyme complexes in most organisms. In plants, octanoyltransferase (LIP2) and lipoyl synthase (LIP1) enzymes in the mitochondria and plastids participate in the de novo synthesis of lipoic acid, and in the attachment of the lipoyl cofactors to their specific targets. In plastids, the lipoylated pyruvate dehydrogenase complex catalyzes the synthesis of the acetyl-CoA that is required for de novo fatty acid synthesis. Since lipoic acid transport across plastid membranes has not been demonstrated, these organelles require specific plastidial LIP1 and LIP2 activities for the in situ synthesis of this cofactor. Previously, one essential LIP1 enzyme and two redundant LIP2 enzymes have been identified within Arabidopsis chloroplasts. In this study, two plastidial sunflower (Helianthus annuus L.) LIP2 genes (HaLIP2p1 and HaLIP2p2) were identified, cloned and characterized. The expression of these genes in different tissues was studied and the tertiary structure of the peptides they encode was modeled by protein docking. These genes were overexpressed in Escherichia coli and their impact on bacterial fatty acid synthesis was studied. Finally, transgenic Arabidopsis plants overexpressing HaLIP2p1 were generated and their seed lipid profiles analyzed. The lipid composition of the transgenic seeds, particularly their TAG species, differed from that of wild-type plants, revealing a relationship between lipoic acid synthesis and the accumulation of storage lipids in Arabidopsis seeds.
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Affiliation(s)
- Raquel Martins-Noguerol
- Instituto de la Grasa-CSIC, Building 46, UPO Campus, Ctra. de Utrera km 1, 41013, Seville, Spain; Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Seville, Spain
| | - Sebastien Acket
- Université de Technologie de Compiègne, Génie Enzymatique et Cellulaire (GEC), UMR-CNRS 7025, CS 60319, 60203, Compiègne Cedex, France
| | - Manuel Adrián Troncoso-Ponce
- Université de Technologie de Compiègne, Génie Enzymatique et Cellulaire (GEC), UMR-CNRS 7025, CS 60319, 60203, Compiègne Cedex, France
| | - Rafael Garcés
- Instituto de la Grasa-CSIC, Building 46, UPO Campus, Ctra. de Utrera km 1, 41013, Seville, Spain
| | - Mónica Venegas-Calerón
- Instituto de la Grasa-CSIC, Building 46, UPO Campus, Ctra. de Utrera km 1, 41013, Seville, Spain
| | - Joaquín J Salas
- Instituto de la Grasa-CSIC, Building 46, UPO Campus, Ctra. de Utrera km 1, 41013, Seville, Spain
| | - Enrique Martínez-Force
- Instituto de la Grasa-CSIC, Building 46, UPO Campus, Ctra. de Utrera km 1, 41013, Seville, Spain
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Sánchez R, González-Thuillier I, Venegas-Calerón M, Garcés R, Salas JJ, Martínez-Force E. The Sunflower WRINKLED1 Transcription Factor Regulates Fatty Acid Biosynthesis Genes through an AW Box Binding Sequence with a Particular Base Bias. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11070972. [PMID: 35406952 PMCID: PMC9002759 DOI: 10.3390/plants11070972] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 03/24/2022] [Accepted: 03/30/2022] [Indexed: 06/12/2023]
Abstract
Sunflower is an important oilseed crop in which the biochemical pathways leading to seed oil synthesis and accumulation have been widely studied. However, how these pathways are regulated is less well understood. The WRINKLED1 (WRI1) transcription factor is considered a key regulator in the control of triacylglycerol biosynthesis, acting through the AW box binding element (CNTNG(N)7CG). Here, we identified the sunflower WRI1 gene and characterized its activity in electrophoretic mobility shift assays. We studied its role as a co-regulator of sunflower genes involved in plastidial fatty acid synthesis. Sunflower WRI1-targets included genes encoding the pyruvate dehydrogenase complex, the α-CT and BCCP genes, genes encoding ACPs and the fatty acid synthase complex, together with the FATA1 gene. As such, sunflower WRI1 regulates genes involved in seed plastidial fatty acid biosynthesis in a coordinated manner, establishing a WRI1 push and pull strategy that drives oleic acid synthesis for its export into the cytosol. We also determined the base bias at the N positions in the active sunflower AW box motif. The sunflower AW box is sequence-sensitive at the non-conserved positions, enabling WRI1-binding. Moreover, sunflower WRI1 could bind to a non-canonical AW-box motif, opening the possibility of searching for new target genes.
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Affiliation(s)
- Rosario Sánchez
- Instituto de la Grasa (CSIC), Pablo de Olavide University Campus, Building 46, Carretera de Utrera km 1, 41013 Seville, Spain; (R.S.); (I.G.-T.); (M.V.-C.); (R.G.); (J.J.S.)
| | - Irene González-Thuillier
- Instituto de la Grasa (CSIC), Pablo de Olavide University Campus, Building 46, Carretera de Utrera km 1, 41013 Seville, Spain; (R.S.); (I.G.-T.); (M.V.-C.); (R.G.); (J.J.S.)
- Jealotts Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK
| | - Mónica Venegas-Calerón
- Instituto de la Grasa (CSIC), Pablo de Olavide University Campus, Building 46, Carretera de Utrera km 1, 41013 Seville, Spain; (R.S.); (I.G.-T.); (M.V.-C.); (R.G.); (J.J.S.)
| | - Rafael Garcés
- Instituto de la Grasa (CSIC), Pablo de Olavide University Campus, Building 46, Carretera de Utrera km 1, 41013 Seville, Spain; (R.S.); (I.G.-T.); (M.V.-C.); (R.G.); (J.J.S.)
| | - Joaquín J. Salas
- Instituto de la Grasa (CSIC), Pablo de Olavide University Campus, Building 46, Carretera de Utrera km 1, 41013 Seville, Spain; (R.S.); (I.G.-T.); (M.V.-C.); (R.G.); (J.J.S.)
| | - Enrique Martínez-Force
- Instituto de la Grasa (CSIC), Pablo de Olavide University Campus, Building 46, Carretera de Utrera km 1, 41013 Seville, Spain; (R.S.); (I.G.-T.); (M.V.-C.); (R.G.); (J.J.S.)
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Martins-Noguerol R, Acket S, Troncoso-Ponce MA, Garcés R, Thomasset B, Venegas-Calerón M, Salas JJ, Martínez-Force E, Moreno-Pérez AJ. Characterization of Helianthus annuus Lipoic Acid Biosynthesis: The Mitochondrial Octanoyltransferase and Lipoyl Synthase Enzyme System. FRONTIERS IN PLANT SCIENCE 2021; 12:781917. [PMID: 34868183 PMCID: PMC8639206 DOI: 10.3389/fpls.2021.781917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 10/26/2021] [Indexed: 05/03/2023]
Abstract
Lipoic acid (LA, 6,8-dithiooctanoic acid) is a sulfur containing coenzyme essential for the activity of several key enzymes involved in oxidative and single carbon metabolism in most bacteria and eukaryotes. LA is synthetized by the concerted activity of the octanoyltransferase (LIP2, EC 2.3.1.181) and lipoyl synthase (LIP1, EC 2.8.1.8) enzymes. In plants, pyruvate dehydrogenase (PDH), 2-oxoglutarate dehydrogenase or glycine decarboxylase are essential complexes that need to be lipoylated. These lipoylated enzymes and complexes are located in the mitochondria, while PDH is also present in plastids where it provides acetyl-CoA for de novo fatty acid biosynthesis. As such, lipoylation of PDH could regulate fatty acid synthesis in both these organelles. In the present work, the sunflower LIP1 and LIP2 genes (HaLIP1m and HaLIP2m) were isolated sequenced, cloned, and characterized, evaluating their putative mitochondrial location. The expression of these genes was studied in different tissues and protein docking was modeled. The genes were also expressed in Escherichia coli and Arabidopsis thaliana, where their impact on fatty acid and glycerolipid composition was assessed. Lipidomic studies in Arabidopsis revealed lipid remodeling in lines overexpressing these enzymes and the involvement of both sunflower proteins in the phenotypes observed is discussed in the light of the results obtained.
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Affiliation(s)
- Raquel Martins-Noguerol
- Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Seville, Spain
| | - Sébastien Acket
- UPJV, UMR CNRS 7025, Enzyme and Cell Engineering, Centre de Recherche Royallieu, Université de Technologie de Compiègne, Compiègne, France
| | - M. Adrián Troncoso-Ponce
- UPJV, UMR CNRS 7025, Enzyme and Cell Engineering, Centre de Recherche Royallieu, Université de Technologie de Compiègne, Compiègne, France
| | | | - Brigitte Thomasset
- UPJV, UMR CNRS 7025, Enzyme and Cell Engineering, Centre de Recherche Royallieu, Université de Technologie de Compiègne, Compiègne, France
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Martins-Noguerol R, DeAndrés-Gil C, Garcés R, Salas J, Martínez-Force E, Moreno-Pérez A. Characterization of the acyl-ACP thioesterases from Koelreuteria paniculata reveals a new type of FatB thioesterase. Heliyon 2020; 6:e05237. [PMID: 33102858 PMCID: PMC7569226 DOI: 10.1016/j.heliyon.2020.e05237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 09/03/2020] [Accepted: 10/08/2020] [Indexed: 11/04/2022] Open
Abstract
Koelreuteria paniculata is a deciduous tree, popular in temperate regions for its ornamental value, which accumulates unusual cyanolipids in its seeds. The seed oil of this plant is rich in the unusual cis-11-eicosenoic fatty acid (20:1, or gondoic acid), a monounsaturated oil of interest to the oleochemical industry. In higher plants, de novo fatty acid biosynthesis takes place in the plastids, a process that is terminated by hydrolysis of the thioester bond between the acyl moiety and the ACP by acyl-ACP thioesterases. The specificity of acyl-ACP thioesterases is fundamental in controlling the fatty acid composition of seed oil. To determine the mechanisms involved in fatty acid biosynthesis in K. paniculata seeds, we isolated, cloned and sequenced two cDNAs encoding acyl-ACP thioesterases in this plant, KpFatA and KpFatB. Both of them were expressed heterologously in Escherichia coli and characterized with different acyl-ACP substrates. The K. paniculata FatB2 displayed unusual substrate specificity, so that unlike most FatB2 type enzymes, it displayed preference for oleoyl-ACP instead of palmitoyl-ACP. This specificity was consistent with the changes in E. coli and N. benthamiana fatty acid composition following heterologous expression of this enzyme. KpFatB also showed certain genetic divergence relative to other FatB-type thioesterases and when modelled, its structure revealed differences at the active site. Together, these results suggest that this thioesterase could be a new class of FatB not described previously.
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Affiliation(s)
- R. Martins-Noguerol
- Group of Genetics and Biochemistry of Seed Lipids, Department of Biochemistry and Molecular Biology of Plants Products, Instituto de la Grasa (CSIC), Ctra. de Utrera km 1, Building 46, 41013 Sevilla, Spain
| | - C. DeAndrés-Gil
- Group of Genetics and Biochemistry of Seed Lipids, Department of Biochemistry and Molecular Biology of Plants Products, Instituto de la Grasa (CSIC), Ctra. de Utrera km 1, Building 46, 41013 Sevilla, Spain
| | - R. Garcés
- Group of Genetics and Biochemistry of Seed Lipids, Department of Biochemistry and Molecular Biology of Plants Products, Instituto de la Grasa (CSIC), Ctra. de Utrera km 1, Building 46, 41013 Sevilla, Spain
| | - J.J. Salas
- Group of Genetics and Biochemistry of Seed Lipids, Department of Biochemistry and Molecular Biology of Plants Products, Instituto de la Grasa (CSIC), Ctra. de Utrera km 1, Building 46, 41013 Sevilla, Spain
| | - E. Martínez-Force
- Group of Genetics and Biochemistry of Seed Lipids, Department of Biochemistry and Molecular Biology of Plants Products, Instituto de la Grasa (CSIC), Ctra. de Utrera km 1, Building 46, 41013 Sevilla, Spain
| | - A.J. Moreno-Pérez
- Group of Genetics and Biochemistry of Seed Lipids, Department of Biochemistry and Molecular Biology of Plants Products, Instituto de la Grasa (CSIC), Ctra. de Utrera km 1, Building 46, 41013 Sevilla, Spain
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