منابع مشابه
Chlorophyll Biosynthesis.
A leaf with 70 million cells houses .v5 x 109 chloroplasts, each containing m600 million molecules of chlorophyll (Simpson and Knoetzel, 1995). These 10’8 chlorophyll molecules, all of which are bound to proteins of the photosynthetic membranes, harvest the sunlight. Approximately 250 to 300 of them transfer the absorbed light energy through neighboring pigments to the “special pair” chlorophyl...
متن کاملChlorophyll Biosynthesis: Various Chlorophyllides as Exogenous Substrates for Chlorophyll Synthetase
The esterification of various chlorophyllides with geranylgeranyl diphosphate was investigated as catalyzed by the enzyme chlorophyll synthetase. The enzyme source was an etioplast membrane fraction from etiolated oat seedlings (Avena sativa L.). The following chlorophyllides were prepared from the corresponding chlorophylls by the chlorophyllase reaction: chlorophyllide a (2) and b (4), bacter...
متن کاملGenetic Control of Chlorophyll Biosynthesis in Chlamydomonas
In this report we describe two nonallelic Mendelian protoporphyrin accumulating mutants br(s)-1 and br(c)-1. Results of experiments with these mutants lead us to postulate that porphyrin biosynthesis branches into light and dark steps between protoporphyrin-IX and magnesium protoporphyrin. We hypothesize that the br(c) locus controls a dark step while the br(s) locus either controls a step in t...
متن کاملRegulation of Chlorophyll Biosynthesis in Angiosperms.
Light controls plant growth and development in a pleiotropic manner. For example, light dictates a pattern of gene expression that leads to photomorphogenesis (Kendrick and Kronenberg, 1994). In the absence of light, an alternative developmental process, skotomorphogenesis, takes place. Photomorphogenesis and skotomorphogenesis are controlled by severa1 different photoreceptors, such as Pr and ...
متن کاملNon-enzymatic conversion of chlorophyll-a into chlorophyll-d in vitro: a model oxidation pathway for chlorophyll-d biosynthesis.
Chlorophyll-a (Chl-a) was readily converted into Chl-d under mild conditions without any enzymes. Treatment of Chl-a dissolved in dry tetrahydrofuran (THF) with thiophenol and acetic acid at room temperature successfully produced Chl-d in 31% yield. During the acidic oxidation, removal of the central magnesium, pheophytinization, was sufficiently suppressed. This mild pathway can give insights ...
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ژورنال
عنوان ژورنال: The Plant Cell
سال: 1995
ISSN: 1040-4651,1532-298X
DOI: 10.1105/tpc.7.7.1039