Rapid Dark Repression of 5-Aminolevulinic Acid Synthesis in Green Barley Leaves
نویسندگان
چکیده
منابع مشابه
Rapid dark repression of 5-aminolevulinic acid synthesis in green barley leaves.
In photosynthetic organisms chlorophyll and heme biosynthesis is tightly regulated at various levels in response to environmental adaptation and plant development. The formation of 5-aminolevulinic acid (ALA) is the key regulatory step and provides adequate amounts of the common precursor molecule for the Mg and Fe branches of tetrapyrrole biosynthesis. Pathway control prevents accumulation of ...
متن کاملCatabolism of 5-Aminolevulinic Acid to CO(2) by Etiolated Barley Leaves.
The in vivo oxidation of the C(4) and C(5) of 5-aminolevulinic acid (ALA) to CO(2) has been studied in etiolated barley (Hordeum vulgare L. var. Larker) leaves in darkness. The rate of (14)CO(2) evolution from leaves fed [4-(14)C]ALA is strongly inhibited by aminooxyacetate, anaerobiosis, and malonate. The rate of (14)CO(2) evolution from leaves fed [5-(14)C]ALA is also inhibited by these treat...
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A hemA mutant of Escherichia coli containing a multicopy plasmid which complemented the mutation excreted 5-aminolevulinic acid (ALA) into the medium. [1-14C]glutamate was substantially incorporated into ALA by this strain, whereas [2-14C]glycine was not. Periodate degradation of labeled ALA showed that C-5 of ALA was derived from C-1 of glutamate. The synthesis of ALA by two sonicate fractions...
متن کاملAlternative Routes for the Synthesis of 5-Aminolevulinic Acid in Maize Leaves : II. Formation from Glutamate.
Intact plastids from greening maize (Zea mays L.) leaves converted [(14)C]glutamate and [(14)C]2-ketoglutarate (KG) to [(14)C]5-aminolevulinic acid (ALA). Glutamate appeared to be the immediate precursor of ALA, while KG was first converted to glutamate, as shown by the effect of various inhibitors of amino acid metabolism. Plastids from greening leaves contained markedly higher activity as com...
متن کامل5-Aminolevulinic acid synthesis in epimastigotes of Trypanosoma cruzi.
BACKGROUND AND AIMS Trypanosoma cruzi is the causative agent of Chagas disease or American trypanosomiasis. The parasite manifests a nutritional requirement for heme compounds because of its biosynthesis deficiency. The aim of this study has been to investigate the presence of metabolites and enzymes of porphyrin pathway, as well as ALA formation in epimastigotes of T. cruzi, Tulahuén strain, T...
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ژورنال
عنوان ژورنال: Plant and Cell Physiology
سال: 2010
ISSN: 1471-9053,0032-0781
DOI: 10.1093/pcp/pcq047