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Literature summary for 2.7.1.68 extracted from

  • Sommarin, M.; Sandelius, A.S.
    Phosphatidylinositol and phosphatidylinositolphosphate kinases in plant plasma membranes (1988), Biochim. Biophys. Acta, 958, 268-278.
No PubMed abstract available

Activating Compound

Activating Compound Comment Organism Structure
Triton X-100 0.3% stimulates phosphorylation of exogenous substrate 2-3fold Triticum aestivum

Inhibitors

Inhibitors Comment Organism Structure
Triton X-100 above 0.015%, phosphorylation of endogenous substrate is inhibited Triticum aestivum

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.2
-
ATP
-
Triticum aestivum

Localization

Localization Comment Organism GeneOntology No. Textmining
plasma membrane
-
Triticum aestivum 5886
-

Metals/Ions

Metals/Ions Comment Organism Structure
Mg2+ with exogenous substrate maximal activity is obtained at 5 mM Mg2+. Maximal phosphorylation of endogenous substrate is in shoot plasma membranes at around 12.5 mM Mg2+. In root membranes 5-40 mM Mg2+ stimulate the phosphorylation of the endogenous substrate Triticum aestivum
Mn2+ stimulatory effect of Mg2+ can only be partly substituted by Mn2+ Triticum aestivum

Organism

Organism UniProt Comment Textmining
Triticum aestivum
-
-
-

Source Tissue

Source Tissue Comment Organism Textmining
root dark-grown Triticum aestivum
-
shoot dark-grown Triticum aestivum
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
ATP + 1-phosphatidyl-1D-myo-inositol 4-phosphate
-
Triticum aestivum ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate
-
?

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
6.5 7 shoot and root plasma membrane, endogenous substrate Triticum aestivum
7.5 8.2 shoot plasma membrane, exogenous substrate Triticum aestivum
7.8 8.2 root plasma membrane, exogenous substrate Triticum aestivum