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Literature summary for 4.3.1.19 extracted from

  • Sharma, R.K.; Mazumder, R.
    Purification, properties, and feedback control of L-threonine dehydratase from spinach (1970), J. Biol. Chem., 245, 3008-3014.
    View publication on PubMed

Activating Compound

Activating Compound Comment Organism Structure
L-Val activates Spinacia oleracea

General Stability

General Stability Organism
L-Ile protects the enzyme against inactivation at low temperatures Spinacia oleracea

Inhibitors

Inhibitors Comment Organism Structure
Ile feed-back inhibition; HgCl2 treated enzyme is less sensitive; L-Val partially reverses inhibition Spinacia oleracea

Metals/Ions

Metals/Ions Comment Organism Structure
K+ stimulates Spinacia oleracea
Li+ stimulates Spinacia oleracea
NH4+ stimulates Spinacia oleracea

Organism

Organism UniProt Comment Textmining
Spinacia oleracea
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
Spinacia oleracea

Source Tissue

Source Tissue Comment Organism Textmining
leaf
-
Spinacia oleracea
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
1
-
L-Thr Spinacia oleracea
7.3
-
L-Thr Spinacia oleracea

Storage Stability

Storage Stability Organism
4°C, little loss of activity after 50 days Spinacia oleracea

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
L-serine
-
Spinacia oleracea pyruvate + NH3
-
?
L-threonine
-
Spinacia oleracea 2-oxobutanoate + NH3
-
?

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
-
-
10 h, 81% loss of activity in presence of 0.05 mM Ile, stable in presence of 1 mM Ile Spinacia oleracea
27
-
10 h, 27% loss of activity in presence of 0.05 mM Ile, stable in presence of 1 mM Ile Spinacia oleracea

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
9
-
-
Spinacia oleracea

Cofactor

Cofactor Comment Organism Structure
pyridoxal 5'-phosphate tightly bound Spinacia oleracea
pyridoxal 5'-phosphate cofactor Spinacia oleracea