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Literature summary for 2.5.1.32 extracted from

  • Schofield, A.; Paliyath, G.
    Modulation of carotenoid biosynthesis during tomato fruit ripening through phytochrome regulation of phytoene synthase activity (2005), Plant Physiol. Biochem., 43, 1052-1060.
    View publication on PubMed

Activating Compound

Activating Compound Comment Organism Structure
ATP stimulatory to PSY activity above 5 mM Solanum lycopersicum

Inhibitors

Inhibitors Comment Organism Structure
ATP 20 mM, inhibitory effect Solanum lycopersicum
Mg2+ 50 mM, inhibitory effect Solanum lycopersicum
Triton X-100 0.2%, total inhibition Solanum lycopersicum
Tween 20 0.2%, total inhibition Solanum lycopersicum

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.0374
-
geranylgeranyl diphosphate in 400 mM Tris (pH 6.5), 10 mM sodium ascorbate, 5 mM MgCl2, 0.5 mM MnCl2, 3 mM ATP and 0.02 mM FAD Solanum lycopersicum

Metals/Ions

Metals/Ions Comment Organism Structure
Mg2+ 1 mM, 40-50% stimulating effect Solanum lycopersicum
additional information Mn2+ does not have any stimulatory effect Solanum lycopersicum

Organism

Organism UniProt Comment Textmining
Solanum lycopersicum P08196
-
-

Purification (Commentary)

Purification (Comment) Organism
Sephadex G-25 gel filtration and ammonium sulfate fractionation Solanum lycopersicum

Source Tissue

Source Tissue Comment Organism Textmining
fruit
-
Solanum lycopersicum
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
geranylgeranyl diphosphate + geranylgeranyl diphosphate
-
Solanum lycopersicum prephytoene diphosphate + diphosphate
-
?

Synonyms

Synonyms Comment Organism
PSY
-
Solanum lycopersicum

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
6.5 8.5
-
Solanum lycopersicum