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sterol/arabidopsis
Веза се чува у привремену меморију
Страна 1 од 220 резултати
Rescue of defective auxin-mediated gene expression and root meristem function by inhibition of ethylene signalling in sterol biosynthesis mutants of Arabidopsis.
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The roles of sterols in plant development are not well understood, but evidence is emerging that they are required for cell division, polarity and patterning by mechanisms that are independent of brassinosteroids, of which they are precursors. Previous evidence shows that two sterol-defective
Isolation and characterization of an Arabidopsis thaliana C-8,7 sterol isomerase: functional and structural similarities to mammalian C-8,7 sterol isomerase/emopamil-binding protein.
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The yeast C-8,7 sterol isomerase contains a polyvalent high-affinity drug binding site similar to mammalian sigma receptors. Exogenously supplied sigma ligands inhibit sterol biosynthesis in yeast, demonstrating a pharmacological relationship between sigma ligand-binding and C-8,7 sterol isomerase
Impaired sterol ester synthesis alters the response of Arabidopsis thaliana to Phytophthora infestans.
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Non-host resistance of Arabidopsis thaliana against Phytophthora infestans, the causal agent of late blight disease of potato, depends on efficient extracellular pre- and post-invasive resistance responses. Pre-invasive resistance against P. infestans requires the myrosinase PEN2. To identify
Brassinosteroids, microtubules and cell elongation in Arabidopsis thaliana. I. Molecular, cellular and physiological characterization of the Arabidopsis bull mutant, defective in the delta 7-sterol-C5-desaturation step leading to brassinosteroid biosynthesis.
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Although cell elongation is a basic function of plant morphogenesis, many of the molecular events involved in this process are still unknown. In this work an extremely dwarf mutant, originally named bul, was used to study one of the main processes of plant development, cell elongation. Genetic
Functional identification of sterol-4alpha-methyl oxidase cDNAs from Arabidopsis thaliana by complementation of a yeast erg25 mutant lacking sterol-4alpha-methyl oxidation.
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Specific primers derived from both genomic sequence data and EST cDNA sequences were used to polymerase chain reaction amplify two full-length cDNA sequences (AtSMO1 and AtSMO2), 801 and 783 bp, respectively, from an Arabidopsis thaliana cDNA library. The predicted proteins show 32 and 29% identity
Identification of cDNAs encoding sterol methyl-transferases involved in the second methylation step of plant sterol biosynthesis.
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Two methyl transfers are involved in the course of plant sterol biosynthesis and responsible for the formation of 24-alkyl sterols (mainly 24-ethyl sterols) which play major roles in plant growth and development. The first methyl transfer applies to cycloartenol, the second one to 24-methylene
Molecular characterization and functional analysis of Glycine max sterol methyl transferase 2 genes involved in plant membrane sterol biosynthesis.
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Sterol C24 methyltransferase (SMT2) genes governing the pattern of phytosterols synthesized in higher plants have been studied in Glycine seedlings and wild-type and engineered Arabidopsis thaliana plants. The SMT2 genes of soybean (SMT2-1 and SMT2-2) previously cloned and characterized (Neelakandan
Cloning and expression of two sterol C-24 methyltransferase genes from upland cotton (Gossypium hirsuturm L.).
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Brassinosteroids (BRs) are an important class of plant steroidal hormones that are essential in a wide variety of physiological processes. Two kinds of intermediates, sitosterol and campesterol, play a crucial role in cell elongation, cellulose biosynthesis, and accumulation. To illuminate the
Role of highly conserved residues in the reaction catalyzed by recombinant Delta7-sterol-C5(6)-desaturase studied by site-directed mutagenesis.
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The role of 15 residues in the reaction catalyzed by Arabidopsis thaliana Delta7-sterol-C5(6)-desaturase (5-DES) was investigated using site-directed mutagenesis and expression of the mutated enzymes in an erg3 yeast strain defective in 5-DES. The mutated desaturases were assayed in vivo by sterol
Transformation of Saccharomyces cerevisiae with a cDNA encoding a sterol C-methyltransferase from Arabidopsis thaliana results in the synthesis of 24-ethyl sterols.
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Using an EST-cDNA probe, a full-length cDNA (411) sequence of 1411 bp was isolated from A. thaliana. This sequence contained features typical of methyltransferases in general and in particular showed 38% identity with ERG6, a S. cerevisiae gene which encodes the zymosterol-C-24-methyltransferase. A
Plant oxidosqualene metabolism: cycloartenol synthase-dependent sterol biosynthesis in Nicotiana benthamiana.
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The plant sterol pathway exhibits a major biosynthetic difference as compared with that of metazoans. The committed sterol precursor is the pentacyclic cycloartenol (9β,19-cyclolanost-24-en-3β-ol) and not lanosterol (lanosta-8,24-dien-3β-ol), as it was shown in the late sixties. However, plant
Plants express a lipid transfer protein with high similarity to mammalian sterol carrier protein-2.
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This is the first report describing the cloning and characterization of sterol carrier protein-2 (SCP-2) from plants. Arabidopsis thaliana SCP-2 (AtSCP-2) consists of 123 amino acids with a molecular mass of 13.6 kDa. AtSCP-2 shows 35% identity and 56% similarity to the human SCP-2-like domain
Sterol Methyl Oxidases Affect Embryo Development via Auxin-Associated Mechanisms.
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Sterols are essential molecules for multiple biological processes, including embryogenesis, cell elongation, and endocytosis. The plant sterol biosynthetic pathway is unique in the involvement of two distinct sterol 4α-methyl oxidase (SMO) families, SMO1 and SMO2, which contain three and two
Excess sterols disrupt plant cellular activity by inducing stress-responsive gene expression.
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Sterols are important lipid constituents of cellular membranes in plants and other organisms. Sterol homeostasis is under strict regulation in plants because excess sterols negatively impact plant growth. HIGH STEROL ESTER 1 (HISE1) functions as a negative regulator of sterol accumulation. If sterol
Plant sterol biosynthesis: identification of two distinct families of sterol 4alpha-methyl oxidases.
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In plants, the conversion of cycloartenol into functional phytosterols requires the removal of the two methyl groups at C-4 by an enzymic complex including a sterol 4alpha-methyl oxidase (SMO). We report the cloning of candidate genes for SMOs in Arabidopsis thaliana, belonging to two distinct
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