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Literature summary for 1.1.1.18 extracted from

  • Stein, R.; Schnarrenberger, C.; Gross, W.
    myo-Inositol dehydrogenase from the acido- and thermophilic red alga Galdieria sulphuraria (1997), Phytochemistry, 46, 17-20.
    View publication on PubMed

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.3
-
scyllo-inosose
-
Galdieria sulphuraria
430
-
myo-inositol
-
Galdieria sulphuraria

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
42000
-
4 * 42000, SDS-PAGE Galdieria sulphuraria
160000
-
density gradient centrifugation Galdieria sulphuraria
180000
-
gel filtration Galdieria sulphuraria

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
myo-inositol + NAD+ Galdieria sulphuraria 75 times lower activity compared to the reverse reaction scyllo-inosose + NADH
-
r

Organism

Organism UniProt Comment Textmining
Galdieria sulphuraria
-
-
-

Purification (Commentary)

Purification (Comment) Organism
to homogeneity, chromatography steps Galdieria sulphuraria

Source Tissue

Source Tissue Comment Organism Textmining
cell culture
-
Galdieria sulphuraria
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
50
-
-
Galdieria sulphuraria

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
epi-inositol + NAD+ 5% of the activity compared to myo-inositol as substrate, conversion of epi-inosose 5% of the activity compared to scyllo-inosose as substrate Galdieria sulphuraria epi-inosose + NADH
-
r
myo-inositol + NAD+ 75 times lower activity compared to the reverse reaction Galdieria sulphuraria scyllo-inosose + NADH
-
r
scyllo-inositol + NAD+ 5% of the activity compared to myo-inositol as substrate Galdieria sulphuraria scyllo-inosose + NADH
-
?

Subunits

Subunits Comment Organism
tetramer 4 * 42000, SDS-PAGE Galdieria sulphuraria

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
50
-
stable for 2 h Galdieria sulphuraria

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
8
-
clearly favours reduction of scyllo-inosose Galdieria sulphuraria

pH Range

pH Minimum pH Maximum Comment Organism
5.5 9.5 half-maximal activity at pH 5.5 and pH 9.5 Galdieria sulphuraria

Cofactor

Cofactor Comment Organism Structure
NAD+
-
Galdieria sulphuraria
NADH
-
Galdieria sulphuraria