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Literature summary for 3.2.1.26 extracted from

  • Andjelkovic, U.; Picuric, S.; Vujcic, Z.
    Purification and characterisation of Saccharomyces cerevisiae external invertase isoforms (2010), Food Chem., 120, 799-804.
    View publication on PubMed

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
25.6
-
sucrose isoforms EINV1, EIV2, EINV3, EINV4, pH 4.5, 25°C Saccharomyces cerevisiae

Localization

Localization Comment Organism GeneOntology No. Textmining
extracellular
-
Saccharomyces cerevisiae
-
-

Organism

Organism UniProt Comment Textmining
Saccharomyces cerevisiae
-
-
-

Purification (Commentary)

Purification (Comment) Organism
external invertase isoforms EINV1, EINV2, EINV3 and EINV4 Saccharomyces cerevisiae

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
1480
-
isoform EINV4, 25°C, pH 4.5 Saccharomyces cerevisiae
2410
-
isoform EINV2, 25°C, pH 4.5 Saccharomyces cerevisiae
2470
-
isoform EINV3, 25°C, pH 4.5 Saccharomyces cerevisiae
3160
-
isoform EINV1, 25°C, pH 4.5 Saccharomyces cerevisiae

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
sucrose + H2O
-
Saccharomyces cerevisiae D-glucose + D-fructose
-
?

Synonyms

Synonyms Comment Organism
EINV1
-
Saccharomyces cerevisiae
EINV2
-
Saccharomyces cerevisiae
EINV3
-
Saccharomyces cerevisiae
EINV4
-
Saccharomyces cerevisiae

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
60
-
10 min, 80% residual activity for isoform EINV1, 60% for isoform EINV2, 25% for isoform EINV3, 45% for isoform EINV4 Saccharomyces cerevisiae

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
3.5 5 isoforms EINV1, EIV2, EINV3, EINV4 Saccharomyces cerevisiae

pI Value

Organism Comment pI Value Maximum pI Value
Saccharomyces cerevisiae isoform EINV4
-
3.8
Saccharomyces cerevisiae isoform EINV3
-
4
Saccharomyces cerevisiae isoform EINV2
-
4.2
Saccharomyces cerevisiae isoform EINV1
-
4.4

General Information

General Information Comment Organism
metabolism the isoforms EINV1, EINV2, EINV3 and EINV4 have the same molecular mass and catalytic properties such as Km for sucrose, pH optimum and temperature optimum, but they exhibit significant difference in pI values, thermal stability and chemical reactivity. The observed differences between isoforms arise from posttranslational modifications Saccharomyces cerevisiae