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Literature summary for 2.5.1.54 extracted from

  • Rubin, J.L.; Jensen, R.A.
    Differentially regulated isoenzymes of 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase from seedlings of Vigna radiata (1985), Plant Physiol., 79, 711-718.
    View publication on PubMedView publication on EuropePMC

Activating Compound

Activating Compound Comment Organism Structure
Chorismic acid activates isozyme DS-Mn Vigna radiata

Inhibitors

Inhibitors Comment Organism Structure
3,4-dihydroxycinnamate isoenzyme DS-Co Vigna radiata
D-erythrose 4-phosphate isoenzyme DS-Mn: substrate inhibition above 0.5 mM Vigna radiata
L-arogenate isozyme DS-Mn, competitive against D-erythrose 4-phosphate, non-competitive against phosphoenolpyruvate Vigna radiata
prephenate isozyme DS-Mn, competitive against D-erythrose 4-phosphate, non-competitive against phosphoenolpyruvate Vigna radiata
Trp L-Trp, weak Vigna radiata

Metals/Ions

Metals/Ions Comment Organism Structure
Co2+ isoenzyme Ds-Co has an absolute requirement for divalent cations, Co2+ being best Vigna radiata
Mn2+ isoenzyme DS-Mn is activated 2.6fold by 0.4 mM Mn2+ Vigna radiata

Organism

Organism UniProt Comment Textmining
Vigna radiata
-
2 differentially regulated isozymes: DS-Mn and DS-Co
-

Purification (Commentary)

Purification (Comment) Organism
partial, isozyme DS-Co and isozyme DS-Mn Vigna radiata

Source Tissue

Source Tissue Comment Organism Textmining
seedling
-
Vigna radiata
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
0.008
-
partially purified isoenzyme DS-Mn Vigna radiata
0.21
-
partially purified isozyme DS-Co Vigna radiata

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
phosphoenolpyruvate + D-erythrose 4-phosphate + H2O
-
Vigna radiata 2-dehydro-3-deoxy-D-arabino-heptonate 7-phosphate + phosphate
-
?

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
isoenzyme DS-Mn Vigna radiata
8.8
-
isoenzyme DS-Co Vigna radiata