Characterization of the bovine brain cytosolic phosphatidylinositol 3-kinase complex - PubMed (original) (raw)

Characterization of the bovine brain cytosolic phosphatidylinositol 3-kinase complex

F Ruiz-Larrea et al. Biochem J. 1993.

Abstract

Receptor-linked phosphatidylinositol (PtdIns) 3-kinase may generate a second-messenger signal. Here a large-scale purification of the bovine brain enzyme, based on methods developed by Morgan, Smith and Parker [(1990) Eur. J. Biochem. 191, 761-767] and Fry, Panayotou, Dhand, Ruiz-Larrea, Gout, Nguyen, Courtneidge and Waterfield [(1992) Biochem. J. 288, 383-393] is described. The purified enzyme is shown to be a heterodimer of 85 kDa and 110 kDa protein subunits (p85 and p110). Labelling with 5'-p-fluorosulphonylbenzoyladenosine shows that p110 contains an ATP-binding site and confers catalytic activity to the complex. The purified complex is known to be highly phosphorylated on both p85 alpha and p110 subunits, and dephosphorylation generates a deactivated complex, indicating that phosphorylation is an important covalent modification of the complex and may modulate PtdIns 3-kinase activity.

PubMed Disclaimer

References

    1. Cell. 1991 May 3;65(3):435-41 - PubMed
    1. Cell. 1991 Apr 5;65(1):91-104 - PubMed
    1. Nature. 1991 May 2;351(6321):33-9 - PubMed
    1. Proc Natl Acad Sci U S A. 1991 Jun 15;88(12):5453-6 - PubMed
    1. Biochem J. 1991 Sep 1;278 ( Pt 2):435-40 - PubMed

MeSH terms

Substances

LinkOut - more resources