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صفحه 1 از جانب 74 نتایج

Purification and Characterization of Two Benzoyl-l-Tyrosine p-Nitroanilide Hydrolases from Etiolated Leaves of Zea mays L.

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Two benzoyl-l-tyrosine p-nitroanilide hydrolases (BTPAases I and II) were purified from the etiolated leaves of Zea mays L. and characterized. BTPAase I was electrophoretically homogeneous and consisted of two identical subunits having a molecular weight of 53,000. The molecular weight of BTPAase II

Optimization of extraction parameters of PTP1β (protein tyrosine phosphatase 1β), inhibitory polyphenols, and anthocyanins from Zea mays L. using response surface methodology (RSM).

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BACKGROUND Protein tyrosine phosphatase expressed in insulin-sensitive tissues (such as liver, muscle, and adipose tissue) has a key role in the regulation of insulin signaling and pathway activation, making protein tyrosine phosphatase a promising target for the treatment of type 2 diabetes

Identification of an essential tyrosine residue in the catalytic site of a chitinase isolated from Zea mays that is selectively modified during inactivation with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide.

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Chitinase isolated from Zea mays seeds is inactivated by 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) in the absence of exogenous nucleophiles. Oligomers of N-acetylglucosamine,N,N',N",N"'-tetra-N-acetylchitotetraose (GlcNAc4), and to a lesser extent, N,N',N"-tri-N-acetylchitotriose (GlcNAc3)

A novel tRNA precursor cleaving endoribonuclease from Zea mays.

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In a search for tRNA-processing nucleases in Zea mays an activity was found which cleaves the precursor to Escherichia coli tyrosine tRNA in the loop of the extra arm within the mature tRNA sequence. The activity (named RNase Zma) was partially purified by ion exchange and gel filtration

D-serine-induced nephrotoxicity: possible interaction with tyrosine metabolism.

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D-serine selectively damages renal proximal tubule cells in rats by a mechanism that is not fully understood. Recent proteomic analysis identified that D-serine elevated plasma fumarylacetoacetate hydrolase (FAH). FAH is involved in tyrosine catabolism; hence, this pathway may be involved in

Repeated exposure of adult rats to Aroclor 1254 causes brain region-specific changes in intracellular Ca2+ buffering and protein kinase C activity in the absence of changes in tyrosine hydroxylase.

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Polychlorinated biphenyls (PCBs) are ubiquitous environmental contaminants, some of which may be neurotoxic. In vitro studies from this laboratory indicated that noncoplanar PCBs perturbed intracellular signal transduction mechanisms including Ca2+ homeostasis, receptor-mediated inositol phosphate

Effect of fluazifop-p-butyl treatment on pigments and polyamines level within tissues of non-target maize plants.

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Fluazifop-p-butyl (FL) is one of the most popular graminicides from arylophenoxypropionate group. These herbicides act as inhibitors of acetyl-CoA carboxylase (ACCase) that catalyzes the formation of malonyl-CoA during metabolism of lipids and/or of some secondary compounds. On the other hand

Modulating effect of amount and types of dietary fat on ornithine decarboxylase, tyrosine protein kinase and prostaglandins production during colon carcinogenesis in male F344 rats.

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Epidemiological and laboratory animal model studies suggest that the effect of dietary fat on colon carcinogenesis depends on the amount and its type. In the present study, we investigated the modulating effect of high-fat diets rich in omega-3, omega-6 and omega-9 fatty acids on liver, colon and

Involvement of tyrosine hydroxylase up regulation in dexamethasone-induced hypertension of rats.

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We investigated the effect of dexamethasone (DEX) on tyrosine hydroxylase (TH) mRNA level, and TH activity and catecholamine levels in the adrenal medulla of the rat. DEX (1 mg/kg/day, s.c.) was administered for 2 days, and a control group was given corn oil. DEX significantly increased systolic

Side chain-side chain interactions of arginine with tyrosine and aspartic acid in Arg/Gly/Tyr-rich domains within plant glycine-rich RNA binding proteins.

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Plant glycine-rich RNA-binding proteins (GRRBPs) contain a glycine-rich region at the C-terminus whose structure is quite unknown. The C-terminal glycine-rich part is interposed with arginine and tyrosine (arginine/glycine/tyrosine (RGY)-rich domain). Comparative sequence analysis of forty-one

[Effects of pyrethroids on tyrosine hydroxylase in nigrostriatum of male rats].

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OBJECTIVE To study the effects of pyrethroids on tyrosine hydroxylase in nigrostriatum of male rats. METHODS Different doses of permethrin and deltamethrin in corn oil were administered to rats by gavage for ten days, then PLC-Fluorescence detection was used to analyzed the contents of dopamine

Molecular Characterization of a Recombinant Zea mays Phenylalanine Ammonia-Lyase (ZmPAL2) and Its Application in trans-Cinnamic Acid Production from L-Phenylalanine.

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Phenylalanine ammonia-lyase (PAL) is one of the most extensively studied enzymes with its crucial role in secondary phenylpropanoid metabolism of plants. Recently, its demand has been increased for aromatic chemical production, but its applications in trans-cinnamic acid production were not much

Purification and characterization of ZmRIP1, a novel reductant-inhibited protein tyrosine phosphatase from maize.

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Protein tyrosine phosphatases (PTPases) have long been thought to be activated by reductants and deactivated by oxidants, owing to the presence of a crucial sulfhydryl group in their catalytic centers. In this article, we report the purification and characterization of Reductant-Inhibited PTPase1

Examination of the role of tyrosine-174 in the catalytic mechanism of the Arabidopsis thaliana chitinase: comparison of variant chitinases generated by site-directed mutagenesis and expressed in insect cells using baculovirus vectors.

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Using the catalytic mechanism of lysozyme as a paradigm for the mechanism of other enzymes that catalyze the hydrolysis of beta-1,4-glycosidic linkages, including chitinase, we have examined the effect of chemical modification with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) on the reaction

Mitogen-activated protein kinase is involved in abscisic acid-induced antioxidant defense and acts downstream of reactive oxygen species production in leaves of maize plants.

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The role of mitogen-activated protein kinase (MAPK) in abscisic acid (ABA)-induced antioxidant defense was investigated in leaves of maize (Zea mays) plants. Treatments with ABA or H(2)O(2) induced the activation of a 46-kD MAPK and enhanced the expression of the antioxidant genes CAT1, cAPX, and

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Herbal & Natural Medicine

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