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Literature summary for 2.4.1.21 extracted from

  • Pollock, C.; Preiss, J.
    The citrate-stimulated starch synthase of starchy maize kernels: purification and properties (1980), Arch. Biochem. Biophys., 204, 578-588.
    View publication on PubMed

Activating Compound

Activating Compound Comment Organism Structure
ammonium sulfate 500 mM, 4fold activation of unprimed starch synthesis Zea mays
citrate 500 mM, 20fold activation of unprimed starch synthesis Zea mays
succinate 500 mM, 6fold activation of unprimed starch synthesis Zea mays

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
additional information amylopectin: 0.16 mg/ml, rabbit liver glycogen: 1.16 mg/ml Zea mays
0.033
-
ADPglucose
-
Zea mays

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
ADP-glucose + alpha-1,4-polyglucan Zea mays involved in starch biosynthesis ADP + alpha-1,4-polyglucan
-
?

Organism

Organism UniProt Comment Textmining
Zea mays
-
-
-

Purification (Commentary)

Purification (Comment) Organism
ammonium sulfate, DEAE-cellulose, aminobutyl-Sepharose, ADP-hexanolamine-Sepharose, aminopropyl-Sepharose Zea mays

Source Tissue

Source Tissue Comment Organism Textmining
seed
-
Zea mays
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
1.1
-
unprimed reaction, synthase I Zea mays
2.3
-
primed reaction, synthase I Zea mays

Storage Stability

Storage Stability Organism
-70°C, 50 mM Tris/acetate buffer, pH 7.5, 2.5 mM DTT, 10 mM EDTA, 5% w/v sucrose Zea mays

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
ADP-glucose + alpha-1,4-polyglucan citrate independent enzyme requires a glucan primer e.g. rabbit liver glycogen Zea mays ADP + alpha-1,4-polyglucan
-
?
ADP-glucose + alpha-1,4-polyglucan involved in starch biosynthesis Zea mays ADP + alpha-1,4-polyglucan
-
?