l lysine/kukurica siata

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Purification and characterization of benzoyl-L-arginine p-nitroanilide hydrolase from etiolated leaves of Zea mays.

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Benzoyl-L-arginine p-nitroanilide hydrolase in the etiolated leaves of Zea mays L. has been purified 1,266-fold by a combination of gel filtration, ion exchange, and hydrophobic chromatography with a recovery of 13%. The specific activity of the purified enzyme is 5.7 units/mg protein. The enzyme is

Partial purification and biochemical characterization of a heteromeric protein phosphatase 2A holoenzyme from maize (Zea mays L.) leaves that dephosphorylates C4 phosophoenolpyruvate carboxylase.

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The activity and allosteric properties of plant phosphoenolpyruvate carboxylase (PEPC; EC 4.1.1.31) are controlled posttranslationally by specific reversible phosphorylation of a strictly conserved serine residue near the N-terminus. This up/down-regulation of PEPC is catalyzed by a dedicated and

Identity of an ABA-activated 46 kDa mitogen-activated protein kinase from Zea mays leaves: partial purification, identification and characterization.

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Mitogen-activated protein kinase (MAPK) cascades have been shown to be important components in abscisic acid (ABA) signal transduction pathway. In this study, a 46 kDa MAPK (p46MAPK) induced by ABA was partially purified from maize (Zea mays) by Q-Sepharose FF, Phenyl-Sepharose FF, Resource Q, Mono

Partial purification and characterization of lysine-ketoglutarate reductase in normal and opaque-2 maize endosperms.

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Lysine-ketoglutarate reductase catalyzes the first step of lysine catabolism in maize (Zea mays L.) endosperm. The enzyme condenses l-lysine and alpha-ketoglutarate into saccharopine using NADPH as cofactor. It is endosperm-specific and has a temporal pattern of activity, increasing with the onset

Partial purification and characterization of dihydrodipicolinic Acid reductase from maize.

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Dihydrodipicolinic acid reductase, an enzyme which catalyzes the pyridine nucleotide-linked reduction of dihydrodipicolinic acid to tetrahydrodipicolinic acid in the biosynthetic pathway leading to l-lysine, has been partially purified from maize (Zea mays cv Pioneer 3145) kernels. The crude maize

Tissue culture isolation of a second mutant locus for increased threonine accumulation in maize.

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Regenerable maize (Zea mays L.) tissue cultures were selected for ability to grow in the presence of inhibitory (1.0-1.5 mM) concentrations of L-lysine plus L-threonine. Testcross kernels from one regenerated plant (LT20) segregated for wild-type and high free threonine concentration in a 1∶1 ratio

Characterization of dual specificity protein kinase from maize seedlings.

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A protein kinase of 57 kDa, able to phosphorylate tyrosine in synthetic substrates pol(Glu4,Tyr1) and a fragment of Src tyrosine kinase, was isolated and partly purified from maize seedlings (Zea mays). The protein kinase was able to phosphorylate exogenous proteins: enolase, caseins, histones and

Antagonistic reactions of arginine and lysine against formaldehyde and their relation to cell proliferation, apoptosis, folate cycle and photosynthesis.

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1H, 13C NMR, ESMS and MS/MS investigations proved that there is an antagonism in the spontaneous reaction of formaldehyde with L-lysine and L-arginine. L-Arginine can only be hydroxymethylated on the guanidino group in a very fast reaction forming mono-, di-, and trihydroxymethyl arginines (HMA).

The effect of dipicolinic acid on maize tissue culture growth is not solely due to inhibition of lysine biosynthesis.

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Dipicolinic acid, a known inhibitor of an enzyme (dihydrodipicolinic acid reductase) in the maize (Zea mays L.) lysine biosynthetic pathway, inhibits the growth of maize suspension and callus cultures. Inhibited cultures contain somewhat lower free lysine levels, but the inhibition of suspension

Purification and characterization of lysine-sensitive aspartate kinase from maize cell cultures.

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Aspartate kinase is a feedback-regulated enzyme that controls the first step common to the biosynthesis of lysine, threonine, isoleucine, and methionine in plants. Aspartate kinase was purified from Black Mexican Sweet maize (Zea mays L.) cell suspension cultures for physical and kinetic

Purification and Characterization of the Bifunctional Enzyme Lysine-Ketoglutarate Reductase-Saccharopine Dehydrogenase from Maize.

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The first enzyme of the lysine degradation pathway in maize (Zea mays L.), lysine-ketoglutarate reductase, condenses lysine and [alpha]-ketoglutarate into saccharopine using NADPH as a cofactor, whereas the second, saccharopine dehydrogenase, converts saccharopine to

Positionable vertical microfluidic cell based on electromigration in a theta pipet.

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A microscale vertical fluidic cell system has been implemented, based on a simple theta pipet pulled to a sharp point (ca. 10-20 μm diameter for the studies herein) and positioned with a high degree of control on a surface. The dual channel arrangement allows an electric field to be generated

Identification of Vibrio hollisae sp. nov. from patients with diarrhea.

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The name Vibrio hollisae (synonym = Special Bacteriology group EF-13) is proposed for a new group of 16 strains that occurred in stool cultures of patients with diarrhea. V. hollisae is a small gram-negative rod, which is motile with a single polar flagellum. No lateral or peritrichous flagella were

Structure-Function Studies and Mechanism of Action of Snake Venom L-Amino Acid Oxidases.

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Snake venom L-amino acid oxidases (SV-LAAOs) are the least studied venom enzymes. These enzymes catalyze the stereospecific oxidation of an L-amino acid to their corresponding α-keto acid with the liberation of hydrogen peroxide (H₂O₂) and ammonia (NH₃). They display

Dietary protein restriction and fat supplementation diminish the acidogenic effect of exercise during repeated sprints in horses.

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A restricted protein diet supplemented with amino acids and fat may reduce the acidogenic effects of exercise. Twelve Arabian horses were assigned to a 2 x 2 factorial experiment: two fat levels: 0 or 10 g/100 g added corn oil and two crude protein levels: 7.5 g/100 g (supplemented with 0.5%

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