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Literature summary extracted from

  • Baba, T.; Noro, M.; Hiroto, M.; Arai, Y.
    Properties of primer-dependent starch synthesis catalysed by starch synthase from potato tubers (1990), Phytochemistry, 29, 719-723.
No PubMed abstract available

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
2.4.1.21 0.81
-
 ADPglucose
-
 Solanum tuberosum

Localization

EC Number Localization Comment Organism GeneOntology No. Textmining
2.4.1.21 soluble
-
 Solanum tuberosum
-
-

Molecular Weight [Da]

EC Number Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
2.4.1.21 38000
-
 possibly a monomer of 70000 Da or a dimer of 2 * 38000 Da Solanum tuberosum
2.4.1.21 70000
-
 gel filtration Solanum tuberosum

Organism

EC Number Organism UniProt Comment Textmining
2.4.1.21 Solanum tuberosum
-
 potato
-

Purification (Commentary)

EC Number Purification (Comment) Organism
2.4.1.21 ammonium sulfate, maltotriose-Sepharose, DEAE-Toyopearl, Sepharose Cl-6B Solanum tuberosum

Source Tissue

EC Number Source Tissue Comment Organism Textmining
2.4.1.21 tuber
-
 Solanum tuberosum
-

Specific Activity [micromol/min/mg]

EC Number Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
2.4.1.21 0.026
-
 in the presence of 0.5 mg glycogen primer and 500 mM sodium citrate Solanum tuberosum

Storage Stability

EC Number Storage Stability Organism
2.4.1.21 -20°C, at least 4 months, no loss of activity Solanum tuberosum
2.4.1.21 4°C, at least 2 weeks, no loss of activity Solanum tuberosum

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2.4.1.21 ADP-glucose + alpha-1,4-polyglucan citrate independent enzyme requires a glucan primer e.g. rabbit liver glycogen Solanum tuberosum ADP + alpha-1,4-polyglucan
-
 ?
2.4.1.21 ADP-glucose + alpha-1,4-polyglucan glucosyl acceptor: amylose Solanum tuberosum ADP + alpha-1,4-polyglucan
-
 ?
2.4.1.21 ADP-glucose + alpha-1,4-polyglucan glucosyl acceptor: amylopectin Solanum tuberosum ADP + alpha-1,4-polyglucan
-
 ?

Subunits

EC Number Subunits Comment Organism
2.4.1.21 More possibly a monomer of 70000 Da or a dimer of 2 * 38000 Da Solanum tuberosum

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
2.4.1.21 8 9
-
 Solanum tuberosum