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

BRENDA support

Literature summary for 2.4.1.1 extracted from

  • Hamdan, I.; Diopoh, J.
    Purification and physicochemical properties of starch phosphorylase from yam (Dioscorea cayenensis) (1991), Plant Sci., 76, 1-7.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
Ca2+ weak Dioscorea cayenensis
EDTA 10 mM, 88% inhibition Dioscorea cayenensis
Hg2+ 0.1 mM, complete inhibition Dioscorea cayenensis
additional information not inhibited by K+, Na+ Dioscorea cayenensis
N-Acetylimidazole glucose 1-phosphate prevents Dioscorea cayenensis
p-hydroxymercuribenzoate glucose 1-phosphate prevents Dioscorea cayenensis
Zn2+ 0.1 mM, complete inhibition; strong inhibition Dioscorea cayenensis

Organism

Organism UniProt Comment Textmining
Dioscorea cayenensis
-
-
-

Purification (Commentary)

Purification (Comment) Organism
ammonium sulfate, DEAE-Sephadex, Sephadex G-100, Sepharose 6B Dioscorea cayenensis

Source Tissue

Source Tissue Comment Organism Textmining
tuber
-
Dioscorea cayenensis
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
20.75
-
-
Dioscorea cayenensis

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
starch + glucose 1-phosphate soluble starch Dioscorea cayenensis starch + phosphate
-
r
[(1->4)-alpha-D-glucosyl]n + phosphate no activity with glucose 6-phosphate, fructose 6-phosphate, and fructose 1,6-diphosphate Dioscorea cayenensis [(1->4)-alpha-D-glucosyl]n-1 + alpha-D-glucose 1-phosphate
-
r
[(1->4)-alpha-D-glucosyl]n + phosphate strict specificity for glucose 1-phosphate Dioscorea cayenensis [(1->4)-alpha-D-glucosyl]n-1 + alpha-D-glucose 1-phosphate
-
r

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
45
-
-
Dioscorea cayenensis

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
40
-
stable below Dioscorea cayenensis

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
5.9 6.3
-
Dioscorea cayenensis

pH Range

pH Minimum pH Maximum Comment Organism
5.2 7.2 approx. half-maximal activity at pH 5.2 and 7.2 Dioscorea cayenensis

pH Stability

pH Stability pH Stability Maximum Comment Organism
5.5 7.5 stable Dioscorea cayenensis