منابع مشابه
Interactions between spinach ferredoxin-nitrite reductase and its substrates. Evidence for the specificity of ferredoxin.
Reduced ferredoxin can serve as electron donor in the 6-electron reduction of nitrite to ammonia catalyzed by spinach nitrite reductase. We have examined interactions between nitrite reductase and its substrates, ferredoxin and nitrite, with emphasis upon protein-protein interactions between ferredoxin and nitrite reductase. Ferredoxin, of the proteins tested, is the most effective in retarding...
متن کاملMetabolic Interactions between Spinach Leaf Nitrite Reductase and Ferredoxin-NADP Reductase: Competition for Reduced Ferredoxin.
Steady state rates of NADP reduction decline upon commencement of nitrite reduction in reconstituted chloroplast preparations. Similarly, steady state rates of nitrite reduction are lower, but not zero, during concurrent NADP reduction. These results imply that competition for substrate occurs and suggest that nitrite reduction can successfully compete for reduced ferredoxin, even at high rates...
متن کاملSpinach ferredoxin. I. Amino acid composition and terminal sequences.
The amino acid composition of several preparations of spinach ferredoxin was determined, and the most reliable composition was concluded to be: Lysd, Hisr, Argr, Trpr, Asp,,, Thr8, Ser?, Glu13, Prod, GUYS, Alas, CYSS, V&, Meto, Ile4, Leus, Tgr4, Phez, (NH3)6. The total number of amino acid residues is 9’7. The molecular weight of spinach ferredoxin was determined by gel tiltration, amino acid c...
متن کاملEvidence for a ferredoxin-dependent choline monooxygenase from spinach chloroplast stroma.
Chenopods synthesize betaine in the chloroplast via a two-step oxidation of choline: choline --> betaine aldehyde --> betaine. Our previous experiments with intact chloroplasts, and in vivo(18)O(2) labeling studies, led us to propose that the first step is mediated by a monooxygenase which uses photosynthetically generated reducing power (C Lerma, AD Hanson, D Rhodes [1988] Plant Physiol 88: 69...
متن کاملInhibitors of the transhydrogenase activity of spinach ferredoxin-Nicotinamide adenine dinucleotide phosphate reductase.
Boiled spinach extracts reversibly inhibit the transhydrogenase activity of ferredoxin-nicotinamide adenine dinucleotide phosphate reductase. The inhibition is competitive with respect to NAD but noncompetitive with respect to NADPH. The inhibitor is most effective at a pH of about 8.0. The inhibitor is characterized as an organic acid but does not appear to be a carbohydrate or phosphoric acid...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1968
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)93506-4