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Literature summary extracted from

  • Welsch, R.; Beyer, P.; Hugueney, P.; Kleinig, H.; von Lintig, J.
    Regulation and activation of phytoene synthase, a key enzyme in carotenoid biosynthesis, during photomorphogenesis (2000), Planta, 211, 846-854.
    View publication on PubMed

Activating Compound

EC Number Activating Compound Comment Organism Structure
2.5.1.32 additional information the enzyme is localized at thylakoid membranes in mature chloroplasts. Under certain light conditions, e.g. far-red light, the increase in PSY mRNA and protein levels is not accompanied by an increase in enzymatic activity. Under these conditions the enzyme is localized in the prolamellar body fraction in a mostly enzymatically inactive form. Subsequent illumination of dark-grown and/or in far-red light seedlings with white light causes the decay of these structures and a topological relocalization of PSY to developing thylakoids which results in its enzymatic activation. The light-dependent mechanism of regulation may contribute to ensuring a spatially and temporally coordinated increase in both carotenoid and chlorophyll contents Sinapis alba

Localization

EC Number Localization Comment Organism GeneOntology No. Textmining
2.5.1.32 chloroplast localized at thylakoid membranes in mature chloroplasts Sinapis alba 9507
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2.5.1.32 etioplast prolamellar body under certain light conditions, e.g. far-red light, the increase in PSY mRNA and protein levels are not accompanied by an increase in enzymatic activity. Under those conditions the enzyme is localized in the prolamellar body fraction in a mostly enzymatically inactive form Sinapis alba 9541
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Organism

EC Number Organism UniProt Comment Textmining
2.5.1.32 Sinapis alba
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-
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Source Tissue

EC Number Source Tissue Comment Organism Textmining
2.5.1.32 cotyledon
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 Sinapis alba
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Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2.5.1.32 geranylgeranyl diphosphate + geranylgeranyl diphosphate
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 Sinapis alba prephytoene diphosphate + diphosphate
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 ?