Nucleotides plant

Major enzyme reactions involved in the transfer of Cl moieties and the concomitant transformations of the cognate coenzyme forms are summarized in Table 1. Whereas animals use folate-type coenzymes predominantly for the biosynthesis of nucleotides, plants and many microorganisms require them also for the biosynthesis of several essential amino acids. A detailed description of the metabolic pathways that depend on the cooperation of folate-type coenzymes is beyond the scope of the present chapter. 

K. C. Ecistwell and P. K. Stumpf, Regulation of plant acetyl-CoA CeU boxylcise by adenylate nucleotides, Plant Physiol. 72 50 (1983). 

Robinson SP and JT WiskLch (1977a) Pyrophosphate inhibition of carbon dioxide Hxation in isolated pea chloroplasts by uptake in exchange for endogenous adenine nucleotides. Plant PhysioL 59, 422-427. 

The electrons undergo the equivalent of a partial oxidation process ia a dark reaction to a positive potential of +0.4 V, and Photosystem I then raises the potential of the electrons to as high as —0.7 V. Under normal photosynthesis conditions, these electrons reduce tryphosphopyridine-nucleotide (TPN) to TPNH, which reduces carbon dioxide to organic plant material. In the biophotolysis of water, these electrons are diverted from carbon dioxide to a microbial hydrogenase for reduction of protons to hydrogen ... 

Figure 9.3 Comparison of the consensus nucleotide sequence of the TATA box (a) and the sequences of the DNA fragments used in the crystal structure determinations of the TATA box-binding proteins from yeast (b) and the plant Arabidopsis thaliana (c).

Diaz-De-Leon F. Klotz K.L. Lagrimini L.M (1993) Nucleotide sequence of the tobacco Nicotiana tabacum) anionic peroxidase gene / / Plant Physiol. V. 101. P. 1117-1118. 

Scolnik, P.A. and Bartley, G.E., Nucleotide sequence of an Arabidopsis cDNA for phytoene synthase. Plant Physiol. 104, 1471, 1993. 

M. Ju.szczuk and A. M. Rychter, Changes in pyridine nucleotide levels in leaves and roots of bean plants Phaseolus vtilgans L.) during phosphate deficiency. J. Plant Physiol. 151 399 (1997). 

Seasonal variations in the metabolic fate of adenine nucleotides prelabelled with [8—1-4C] adenine were examined in leaf disks prepared at 1-month intervals, over the course of 1 year, from the shoots of tea plants (Camellia sinensis L. cv. Yabukita) which were growing under natural field conditions by Fujimori et al.33 Incorporation of radioactivity into nucleic acids and catabolites of purine nucleotides was found throughout the experimental period, but incorporation into theobromine and caffeine was found only in the young leaves harvested from April to June. Methy-lation of xanthosine, 7-methylxanthine, and theobromine was catalyzed by gel-filtered leaf extracts from young shoots (April to June), but the reactions could not be detected in extracts from leaves in which no synthesis of caffeine was observed in vivo. By contrast, the activity of 5-phosphoribosyl-1-pyrophosphate synthetase was still found in leaves harvested in July and August. 

Negishi, O., Ozzawa.T., and Imagawa, H., Biosynthesis of caffeine from purine nucleotides in tea plant, Bioscience, Biotechnology, and Biochemistry, 56,499,1992... 

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