Any feedback?
Please rate this page
(literature.php)
(0/150)

BRENDA support

Literature summary for 3.2.1.2 extracted from

  • Matsui, H.; Chiba, S.; Shimomura, T.
    Purification and some properties of active beta-amylase in rice (1977), Agric. Biol. Chem., 41, 841-847.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
Ag+ AgNO3 Oryza sativa
CO32-
-
Oryza sativa
Hg2+ HgCl2 Oryza sativa
iodoacetamide
-
Oryza sativa
NEM
-
Oryza sativa
PCMB
-
Oryza sativa

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
additional information Km: 3 mg/ml for soluble starch Oryza sativa

Metals/Ions

Metals/Ions Comment Organism Structure
Ca2+ 100 mM CaCl2, 29% stimulation Oryza sativa
K+ 100 mM, 20-30% stimulation Oryza sativa
NaCl 100 mM, 28% stimulation Oryza sativa

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
53000
-
gel filtration, disc gel electrophoresis Oryza sativa

Organism

Organism UniProt Comment Textmining
Oryza sativa
-
L. var. Shinsetsu
-

Oxidation Stability

Oxidation Stability Organism
enzyme is oxidatively dimerized by treatemnt with 0.3 M ferricyanide in 3 M urea. The dimerized enzyme is thought to be one of inert beta-amylases in ungerminated seeds Oryza sativa

Purification (Commentary)

Purification (Comment) Organism
-
Oryza sativa

Source Tissue

Source Tissue Comment Organism Textmining
seed
-
Oryza sativa
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
starch + H2O soluble Oryza sativa maltose + ?
-
?

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
55
-
15 min, 50% loss of activity Oryza sativa

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
5.5 6.5
-
Oryza sativa

pH Range

pH Minimum pH Maximum Comment Organism
4 8 pH 4.0: about 65% of maximal activity, pH 8.0: about 55% of maximal activity Oryza sativa

pH Stability

pH Stability pH Stability Maximum Comment Organism
6 8 37°C, 90 min, stable Oryza sativa