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Literature summary for 2.4.1.242 extracted from

  • Denyer, K.; Waite, D.; Motawia, S.; Moller, B.L.; Smith, A.M.
    Granule-bound starch synthase I in isolated starch granules elongates malto-oligosaccharides processively (1999), Biochem. J., 340, 183-191.
No PubMed abstract available

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
additional information kinetics of isozymes Pisum sativum

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
ADP-glucose + (1,4-alpha-glucosyl)n Pisum sativum
-
ADP + (1,4-alpha-glucosyl)n+1
-
?
additional information Pisum sativum isozyme GBSSI synthesizes the amylose component of starch, while isozyme GBSSII does not, due to kinetic differences ?
-
?

Organism

Organism UniProt Comment Textmining
Pisum sativum
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2 isozymes GBSSI and GBSSII in wild-type plants, isozyme GBSSI in rug5 mutant, and isozyme GBSSII in lam mutant
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Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
additional information
-
starch synthase and malto-oligosaccharide elongation activities of isozymes, overview Pisum sativum

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
ADP-glucose + (1,4-alpha-glucosyl)n
-
Pisum sativum ADP + (1,4-alpha-glucosyl)n+1
-
?
additional information isozyme GBSSI synthesizes the amylose component of starch, while isozyme GBSSII does not, due to kinetic differences Pisum sativum ?
-
?
additional information isozyme GBSSI in isolated starch granules elongates malto-oligosaccharides progressively, adding more than one glucose molecule for each enzyme-glucan encounter, isozyme GBSSII also elongates malto-oligosaccharides but with lower affinity and not progressively Pisum sativum ?
-
?

Synonyms

Synonyms Comment Organism
GBSSI
-
Pisum sativum
granule-bound starch synthase I
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Pisum sativum

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
25
-
assay at Pisum sativum

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
8.5
-
assay at Pisum sativum