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Stran 1 iz 93 rezultatov
BjMYB1, a transcription factor implicated in plant defence through activating BjCHI1 chitinase expression by binding to a W-box-like element.
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We previously identified the W-box-like-4 (Wbl-4) element (GTAGTGACTCAT), one of six Wbl elements in the BjC-P promoter of the unusual chitinase gene BjCHI1 from Brassica juncea, as the core element responsive to fungal infection. Here, we report the isolation and characterization of the cognate
Crystal structure and mode of action of a class V chitinase from Nicotiana tabacum.
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A class V chitinase from Nicotiana tabacum (NtChiV) with amino acid sequence similar to that of Serratia marcescens chitinase B (SmChiB) was expressed in E. coli and purified to homogeneity. When N-acetylglucosamine oligosaccharides [(NAG)(n)] were hydrolyzed by the purified NtChiV, the second
Identification of fungus-responsive cis-acting element in the promoter of Brassica juncea chitinase gene, BjCHI1.
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Chitinases are a group of pathogenesis-related proteins. The Brassica juncea chitinase gene BjCHI1 is highly inducible by pathogenic fungal infection, suggesting that the promoter of BjCHI1 might contain specific cis-acting element responsive to fungal attack. To identify the fungus-responsive
Only Specific Tobacco (Nicotiana tabacum) Chitinases and [beta]-1,3-Glucanases Exhibit Antifungal Activity.
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Different isoforms of chitinases and [beta]-1,3-glucanases of tobacco (Nicotiana tabacum cv Samsun NN) were tested for their antifungal activities. The class I, vacuolar chitinase and [beta]-1,3-glucanase isoforms were the most active against Fusarium solani germlings, resulting in lysis of the
CHRK1, a chitinase-related receptor-like kinase, plays a role in plant development and cytokinin homeostasis in tobacco.
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CHRK1 encodes a receptor-like kinase that contains a chitinase-related sequence in the extracellular domain in Nicotiana tabacum. In this study, we showed that CHRK1 is mainly expressed in the shoot apex region including leaf primordia and young leaves, and germinating seedlings and vascular
CHRK1, a chitinase-related receptor-like kinase in tobacco.
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A cDNA encoding a chitinase-related receptor-like kinase, designated CHRK1, was isolated from tobacco (Nicotiana tabacum). The C-terminal kinase domain (KD) of CHRK1 contained all of the conserved amino acids of serine/threonine protein kinases. The putative extracellular domain was closely related
Extracellular targeting of the vacuolar tobacco proteins AP24, chitinase and beta-1,3-glucanase in transgenic plants.
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The Nicotiana tabacum ap24 gene encoding a protein with antifungal activity toward Phytophthora infestans has been characterized. Analysis of cDNA clones revealed that at least three ap24-like genes are induced in tobacco upon infection with tobacco mosaic virus. Amino acid sequencing of the
The effect of ethylene on the cell-type-specific and intracellular localization of β-1,3-glucanase and chitinase in tobacco leaves.
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We have studied the effect of ethylene on the localization of the basic isoforms of glucan endo-1,3-β-glucosidase (β-1,3-glucanase, EC 3.2.1.39) and endo-chitinase (chitinase, EC 3.2.1.14) in leaves of Nicotiana tabacum L. cv. Havana 425. Comparisons of the enzyme contents of the lower epidermis of
Regulation of a plant pathogenesis-related enzyme: Inhibition of chitinase and chitinase mRNA accumulation in cultured tobacco tissues by auxin and cytokinin.
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Two endochitinases (EC 3.2.1.14) of M(r) values of approximately 34,000 and approximately 32,000 have been purified from cultured tissues of Nicotiana tabacum cv. Havana 425. The chitinase content of cloned tobacco pith tissues subcultured on hormone-free medium increases by approximately 5-fold to
Evidence for secretion of vacuolar alpha-mannosidase, class I chitinase, and class I beta-1,3-glucanase in suspension cultures of tobacco cells.
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We have investigated the possibility that vacuolar proteins can be secreted into the medium of cultured cells of Nicotiana tabacum L. Time-course and balance-sheet experiments showed that a large fraction, up to ca. 19%, of vacuolar alpha-mannosidase (EC 3.2.1.24) and vacuolar class I chitinase (EC
Purification, cDNA cloning, and characterization of plant chitinase with a novel domain combination from lycophyte Selaginella doederleinii.
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Chitinase-A from a lycophyte Selaginella doederleinii (SdChiA), having molecular mass of 53 kDa, was purified to homogeneity by column chromatography. The cDNA encoding SdChiA was cloned by rapid amplification of cDNA ends and polymerase chain reaction. It consisted of 1477 nucleotides and its open
Crystal structures and inhibitor binding properties of plant class V chitinases: the cycad enzyme exhibits unique structural and functional features.
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A class V (glycoside hydrolase family 18) chitinase from the cycad Cycas revoluta (CrChiA) is a plant chitinase that has been reported to possess efficient transglycosylation (TG) activity. We solved the crystal structure of CrChiA, and compared it with those of class V chitinases from Nicotiana
Introduction of a tryptophan side chain into subsite +1 enhances transglycosylation activity of a GH-18 chitinase from Arabidopsis thaliana, AtChiC.
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A tryptophan side chain was introduced into subsite +1 of family GH-18 (class V) chitinases from Nicotiana tabacum and Arabidopsis thaliana (NtChiV and AtChiC, respectively) by the mutation of a glycine residue to tryptophan (G74W-NtChiV and G75W-AtChiC). The specific activity toward glycol chitin
Beta-1, 3-glucanase and chitinase transgenes in hybrids show distinctive and independent patterns of posttranscriptional gene silencing.
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Nicotiana sylvestris Speg. & Comes transformed with a tobacco class-I beta-1,3-glucanase (GLU I ) cDNA driven by CaMV 35S RNA expression signals exhibits posttranscriptional gene silencing (PTGS) which is triggered between the cotyledon and two-leaf stages of seedling development and is
Glucanases and chitinases as causal agents in the protection of Acacia extrafloral nectar from infestation by phytopathogens.
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Nectars are rich in primary metabolites and attract mutualistic animals, which serve as pollinators or as an indirect defense against herbivores. Their chemical composition makes nectars prone to microbial infestation. As protective strategy, floral nectar of ornamental tobacco (Nicotiana
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