Details

Autor(en) / Beteiligte

• Höer, Dieter
• Kwiatkowski, Ariane
• Seib, Christine
• Rosenthal, Walter
• Schultz, Günter
• Oberdisse, Eckard

Titel

Degradation of inositol 1,3,4,5-tetrakisphosphates by porcine brain cytosol yields inositol 1,3,4-trisphosphate and inositol 1,4,5-trisphosphate

Ist Teil von

• Biochemical and biophysical research communications, 1988-07, Vol.154 (2), p.668-675

Ort / Verlag

San Diego, CA: Elsevier Inc

Erscheinungsjahr

1988

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Inositol 1,3,4,5-tetrakisphosphates (Ins(1,3,4,5)P 4), 32P-labelled in positions 4 and 5 were prepared enzymatically, using [4- 32P]-phosphatidylinositol 4-phosphate (PtdInsP) and [5- 32P]phosphatidylinositol 4,5-bisphosphate (PtdInsP 2) as substrates, respectively. Degradation studies of Ins(1,3,4,5)P 4, using an enriched phosphatase preparation from porcine brain cytosol, led to the formation of two inositol trisphosphate isomers which were identified as inositol 1,3,4-trisphosphate (Ins(1,3,4)P 3) and inositol 1,4,5-trisphosphate (Ins(1,4,5)P 3). This novel degradation pathway of Ins(1,3,4,5)P 4 to Ins(1,4,5)P 3 provides an additional source for the generation of Ins(1,4,5)P 3, involving a 3-phosphatase.