Tocopherol cyclase

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August undefined, 2024

Webb29 aug. 2006 · Coexpression of a hydroxyphenylpyruvate dioxygenase gene with both a homogentisate phytyltransferase gene and a tocopherol cyclase gene elevated this effect with maximum increases of up to two-fold in individual lines and this phenotype was found to be stably inherited. Webb21 apr. 2006 · Finally, γ-tocopherol methyl transferase (VTE4) completes the synthesis of α-tocopherol, the most abundant form of tocopherol in the chloroplast. γ-Tocopherol …

Biosynthesis Pathways of Vitamin E and Its Derivatives in Plants

Webb10 apr. 2012 · Tocopherols are lipophilic antioxidants and together with tocotrienols belong to the vitamin-E family. The four forms of tocopherols (α-, β-, γ- and δ … ite online courses

ENZYME - 5.5.1.24 tocopherol cyclase - Expasy

Webb1 juli 1996 · Mechanistic investigations2 revealed that the toco- pherol cyclase is operating by si-protonation of the double bond of 2 and concomitant re-attack of the phenolic O … Webb16 mars 2024 · Afterwards, cycling reaction for chromanol ring formation generating δ-tocopherol and β-tocopherol. On the other hand, γ-tocoferol and α-tocoferol are synthesized through the action of tocopherol cyclase and γ-tocopherol methyltransferase, respectively (Fig. 9). Webb14 feb. 2005 · In plants, tocopherol is synthesized in plastids where it protects membranes from oxidative degradation by reactive oxygen species. Tocopherol cyclase (VTE1) … it entry resume

Horticulturae Free Full-Text Effect of the Soil and Ripening Stage …

Vitamin E (Tocopherol) and phytyl esters in plants — IMBIO

Webb30 apr. 2013 · The tocopherols were absent from vte1, as expected ( Fig. 4, A, C, and D ). However, under HL treatment, abc1k3 accumulated significantly higher amounts of α-TQ, … WebbTocopherol cyclase. This family contains tocopherol cyclases. These enzymes are involved in the synthesis of tocopherols and tocotrienols (vitamin E). Links? Taxonomy: cellular organisms: PubMed: 1 link: Protein: Related Protein : Related Structure: Statistics? Accession: cl14571: PSSM Id: 449330: Name: Tocopherol_cycl: Created: 8-Apr-2010: ite oklahoma cityWebb8 apr. 2005 · Tocopherols and tocotrienols, which differ in the degree of saturation of their hydrophobic prenyl chain, are lipophilic antioxidants that collectively constitute vitamin E, an essential dietary compound for humans and animals. itepa chapter 3

"Webb10 apr. 2012 · Tocopherols are lipophilic antioxidants and together with tocotrienols belong to the vitamin-E family. The four forms of tocopherols (α-, β-, γ- and δ-tocopherols) consist of a polar chromanol ring and lipophilic prenyl chain with differences in the position and number of methyl groups. " - Tocopherol cyclase

Tocopherol cyclase

Isolation of an Arabidopsis mutant ...' href='https://www.pnas.org/doi/pdf/10.1073/pnas.182330899' >WebbIsolation of an Arabidopsismutant lacking vitamin E and identification of a cyclase essential for all tocopherol biosynthesis Svetlana Porﬁrova*, Eveline Bergmu ¨ller*, Susanne Tropf†, Rainer Lemke†, and Peter Dormann*‡ *Department of Lothar Willmitzer, Max Planck Institute of Molecular Plant Physiology, Am Mu¨hlenberg 1, 14476 Golm, … Fermentative production of Vitamin E tocotrienols in Webb14 okt. 2024 · The major structural difference of tocotrienols from tocopherols lies in the unsaturated isoprenoid side chain containing three double bonds, which would … https://www.nature.com/articles/s41467-020-18958-9 Tocopherol Cyclase - an overview ScienceDirect Topics WebbTocopherol Cyclase Lipids in Plants and Algae: From Fundamental Science to Industrial Applications. Venkatasalam Shanmugabalaji, ... ... Sunflower Oil Minor Constituents. … https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/tocopherol-cyclase (PDF) Silencing of Tocopherol Cyclase and gamma-Tocopherol ... Webb23 maj 2024 · Silencing of Tocopherol Cyclase and gamma-Tocopherol Methyltransferase leads to the altered content of tocopherols in transgenic Nicotiana tabacum. May 2024 Conference: INNOVATIONS AND ... https://www.researchgate.net/publication/340808897_Silencing_of_Tocopherol_Cyclase_and_gamma-Tocopherol_Methyltransferase_leads_to_the_altered_content_of_tocopherols_in_transgenic_Nicotiana_tabacum Tocopherol biosynthesis: chemistry, regulation and effects of https://link.springer.com/article/10.1007/s11738-012-0988-9 Molecular cloning and characterization of a tocopherol cyclase … Webb19 apr. 2011 · Tocopherol cyclase is a rate-limiting enzyme involved in tocopherol biosynthesis. The full-length cDNA encoding tocopherol cyclase (designated as LsTC) was cloned from lettuce (Lactuca sativa) for the first time by rapid amplification of cDNA ends (RACE) and characterized by means of quantitative RT-PCR. https://pubmed.ncbi.nlm.nih.gov/21523658/ The Plant Journal Tocopherol metabolism, oxidation and recycling under … Webbc-tocopherol, respectively) and fragmentation pattern rela-tive intensities. The retention time of 10.68 min and the fragmentationpatternofd-tocopherol(m/z 474,208and248) are diagnostic for this compound. The Arabidopsis vte1 mutation disrupts tocopherol cyclase activity, resulting in the loss of all tocopherols and https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1365-313X.2008.03539.x Horticulturae Free Full-Text Effect of the Soil and Ripening Stage … Webb30 sep. 2024 · The purpose of this work was to investigate the effect of the ripening stage and type of soil on the concentration of carotenoids and vitamins in Habanero pepper (Capsicum chinense Jacq.). Pepper plants were grown in two soils named according to the Mayan classification as: K’ankab lu’um (red soil) and Box lu’um … https://www.mdpi.com/1339790 UniProt Webb1 dec. 2001 · Function. Involved in the synthesis of both tocopherols and tocotrienols (vitamin E), which presumably protect photosynthetic complexes from oxidative stress. … https://www.uniprot.org/uniprot/Q94FY7 Tocopherol cyclase (VTE1) localization and vitamin E https://pubmed.ncbi.nlm.nih.gov/16414959/ Characterization of Tocopherol Cyclases from Higher Plants and ... Webb11 aug. 2003 · Tocopherol cyclase (TC) catalyzes the conversion of various phytyl quinol pathway intermediates to their corresponding tocopherols through the formation of the chromanol ring. Herein, the molecular and biochemical characterization of TCs from Arabidopsis (VTE1 [VITAMIN E 1]), Zea mays (SXD1 [Sucrose Export Deficient 1]) and … https://academic.oup.com/plphys/article/132/4/2184/6111814 Characterisation of plant tocopherol cyclases and their … Webb28 jan. 2005 · Tocopherol cyclase (TC) catalyses the formation of the chromanol headgroup of the various tocopherol isoforms. TCs from Arabidopsis and maize (Zea mays) were expressed in Escherichia coli and purified. Analysis of the enzymatic properties revealed similarities but also differences between the two enzymes. https://febs.onlinelibrary.wiley.com/doi/abs/10.1016/j.febslet.2005.01.030 The substrate specificity of tocopherol cyclase - ScienceDirect Webb1 juli 1996 · Mechanistic investigations2 revealed that the toco- pherol cyclase is operating by si-protonation of the double bond of 2 and concomitant re-attack of the phenolic O-atom, Scheme 1. Subsequent purification of *Current … https://www.sciencedirect.com/science/article/pii/0968089696001253 Genome-wide association study and pathway-level analysis of ... Webb7 aug. 2013 · Tocopherols and tocotrienols, collectively known as tocochromanols, are the major lipid-soluble antioxidants in maize (Zea mays L.) grain. Given that individual … https://pubmed.ncbi.nlm.nih.gov/23733887/ Tocochromanols: Rancid lipids, seed longevity, and beyond PNAS Webb7 okt. 2010 · Tocopherol cyclase forms the hydroxychroman ring of tocochromanols. The role of VTE1 in PC-8 synthesis was recently demonstrated in Arabidopsis ( 9 ). In these studies, as in the present article, PC-8 was not detected in the vte1 mutant, leading to the suggestion that plastoquinol-9 is the precursor of PC-8. https://www.pnas.org/doi/10.1073/pnas.1012749107 ENZYME - 5.5.1.24 tocopherol cyclase - Expasy WebbAccepted Name; tocopherol cyclase Reaction catalysed; delta-tocopherol => 2-methyl-6-phytyl-1,4-benzene-1,4-diol; gamma-tocopherol => 2,3-dimethyl-6-phytylbenzene-1,4-diol; delta-tocotrienol => 6-geranylgeranyl-2-methylbenzene-1,4-diol; gamma-tocotrienol => 6-geranylgeranyl-2,3-dimethylbenzene-1,4-diol; Comment(s) The enzyme has been … https://enzyme.expasy.org/EC/5.5.1.24 Transgenic sweetpotato plants overexpressing tocopherol cyclase … Webb1 nov. 2024 · Previously, we isolated five tocopherol biosynthesis genes from sweetpotato (Ipomoea batatas [L.] Lam) plants, including tocopherol cyclase (IbTC). In this study, we generated transgenic sweetpotato plants overexpressing IbTC under the control of cauliflower mosaic virus (CaMV) 35S promoter (referred to as TC plants) via … https://www.sciencedirect.com/science/article/pii/S0981942819303985 Enhanced vitamin E content in an Indica rice cultivar harbouring … Webb21 mars 2024 · Search worldwide, life-sciences literature Search. Advanced Search Coronavirus articles and preprints Search examples: https://europepmc.org/article/PMC/PMC8196657 Transgenic sweetpotato plants overexpressing tocopherol cyclase … WebbTocopherols (collectively known as vitamin E) are a group of lipophilic antioxidants that protect cellular components against oxidative stress. Previously, we isolated five … https://pubmed.ncbi.nlm.nih.gov/31639559/

WebbThe tocopherol cyclase was one of the key enzymes in plant vitamin E biosynthesis pathway. According to the study of Carthamus tinctorius transcriptome data,the … Webb1 nov. 2014 · The tocopherol cyclase gene is responsible for production of tocopherol in Arabidopsis. This gene when overexpressed in transgenic tobacco improved growth under water deficient environment (Woo...

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Webb27 juni 2024 · Tocopherol (vitamin E) is a lipid antioxidant involved in scavenging reactive oxygen species in plants and animals. A tocopherol-deficient mutant identified in our laboratory, vitamin E deficient mutant 1 (vte1), is defective in tocopherol cyclase and thus completely devoid of tocopherol (Porfirova et al., 2002). Webb1 aug. 2013 · Tocopherols have a saturated tail derived from phytol diphosphate, whereas the tail of tocotrienols is derived from geranylgeranyl diphosphate and contains three unconjugated double bonds. α-, β-, δ-, and γ-Tocopherols and tocotrienols refer to four species of compounds distinguished by the degree and position of methyl groups (three, …

Webb28 feb. 2005 · Tocopherols, collectively known as vitamin E, are only synthesised in photosynthetic organisms. Tocopherol cyclase (TC) catalyses the formation of the … WebbThe expression of vitamin C defective 2 (VTC2) and tocopherol cyclase (TC) genes, which encode key enzymes in the AsA and Toc biosynthetic pathways, respectively, was …

Webb1 juni 2012 · To increase the α-tocopherol (vitamin E) content, Arabidopsis genes encoding homogentisate phytyltransferase (HPT) and tocopherol cyclase (TC) were constitutively expressed individually and in... Webb13 maj 2024 · 3. Vitamin E structures and biosynthesis. Plants synthesize eight different molecules with vitamin E antioxidant activity, including α-, β-, γ-, and δ-tocopherols and the corresponding four tocotrienols. These forms were different with respect the number and position of the methyl groups on their chromanol ring.

Webb28 feb. 2005 · Tocopherols, collectively known as vitamin E, are only synthesised in photosynthetic organisms. Tocopherol cyclase (TC) catalyses the formation of the …

Webb24 juli 2011 · tocopherol cyclase γ-TMT: γ-tocopherol methyltransferase References Argyris, J., Dahal, P., Hayashi, E., Still, D.W., Bradford, K.J.: Genetic variation for lettuce seed thermoinhibition is associated with temperature-sensitive expression of abscisic acid, gibberellin, and ethylene biosynthesis, metabolism, and response genes. — Plant. itep 13013Webb17 maj 2004 · The cyclic ammonium cation 5 and its guanidinium analogue 4 are inhibitors of tocopherol cyclase. Monoclonal antibodies were raised against protein conjugates of … itepa 2003 benefits codeWebb14 feb. 2011 · In plants, tocopherol cyclase (TC/VTE1) catalyzes the conversion of 2,3-dimethyl-5-phytyl-1,4-benzoquinone (DMPBQ) to γ-tocopherol. In the present study, … itepa 2003 section 296Webb26 juli 2024 · The tocopherol cyclase gene VTE1 was 1.61-fold upregulated after 30 min and 1.4-fold upregulated after 1 h, and, finally, marginally downregulated after 24 h (-0.4-fold). The early upregulation may increase the tocopherol level during the first h … itep 2019Webb10 apr. 2024 · Tocopherol cyclase involved in tocopherol (vitamin E)synthesis. VTE1 over-expressing plants have increased tocopherol indicating VTE1 is a major limiting factor in … itepasWebb4 sep. 2002 · Tocopherol (vitamin E) is a plant chloroplast lipid presumed to be involved in the response to oxidative stress. A tocopherol-deficient mutant (vte1) was isolated from Arabidopsis thaliana by using a TLC-based screening approach.Mutant plants lacked all four tocopherol forms and were deficient in tocopherol cyclase activity. itep 87Webb19 apr. 2011 · Tocopherol cyclase is a rate-limiting enzyme involved in tocopherol biosynthesis. The full-length cDNA encoding tocopherol cyclase (designated as LsTC) … itepa 2003 s167