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The Regulation of Class IA PI 3-Kinases by Inter-Subunit Interactions

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Book cover Phosphoinositide 3-kinase in Health and Disease

Part of the book series: Current Topics in Microbiology and Immunology ((CT MICROBIOLOGY,volume 346))

Abstract

Phosphoinositide 3-kinases (PI 3-kinases) are activated by growth factor and hormone receptors, and regulate cell growth, survival, motility, and responses to changes in nutritional conditions (Engelman et al. 2006). PI 3-kinases have been classified according to their subunit composition and their substrate specificity for phosphoinositides (Vanhaesebroeck et al. 2001). The class IA PI 3-kinase is a heterodimer consisting of one regulatory subunit (p85α, p85β, p55α, p50α, or p55γ) and one 110-kDa catalytic subunit (p110α, β or δ). The Class IB PI 3-kinase is also a dimer, composed of one regulatory subunit (p101 or p87) and one catalytic subunit (p110γ) (Wymann et al. 2003). Class I enzymes will utilize PI, PI[4]P, or PI[4,5]P2 as substrates in vitro, but are thought to primarily produce PI[3,4,5]P3 in cells.

The crystal structure of the Class IB PI 3-kinase catalytic subunit p110γ was solved in 1999 (Walker et al. 1999), and crystal or NMR structures of the Class IA p110α catalytic subunit and all of the individual domains of the Class IA p85α regulatory subunit have been solved (Booker et al. 1992; Günther et al. 1996; Hoedemaeker et al. 1999; Huang et al. 2007; Koyama et al. 1993; Miled et al. 2007; Musacchio et al. 1996; Nolte et al. 1996; Siegal et al. 1998). However, a structure of an intact PI 3-kinase enzyme has remained elusive. In spite of this, studies over the past 10 years have lead to important insights into how the enzyme is regulated under physiological conditions. This chapter will specifically discuss the regulation of Class IA PI 3-kinase enzymatic activity, focusing on regulatory interactions between the p85 and p110 subunits and the modulation of these interactions by physiological activators and oncogenic mutations. The complex web of signaling downstream from Class IA PI 3-kinases will be discussed in other chapters in this volume.

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Acknowledgments

This work was supported by NIH grants GM55692, DK07069, and 1 PO1 CA100324, and grants from American Diabetes Association and the Janey Fund. I thank Dr. Mirvat El-Sibai, Beirut University, for critical reading of the manuscript. I also thank Drs. Mark Girvin, Gary Gerfen, Steve Almo, and George Orr (deceased) at Albert Einstein College of Medicine, and Dr. Roger Williams at the MRC, Cambridge, for collaboration and hours of discussion over the past decade. Finally, I thank all my graduate students and postdocs for their scientific contributions to many of the studies cited here.

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  1. Department of Molecular Pharmacology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA

    Jonathan M. Backer

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Correspondence to Jonathan M. Backer .

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  1. Intellikine, North Torreye Pines Road 10931, La Jolla, 92037, California, USA

    Christian Rommel

  2. , Institute of Cancer and the London Schoo, Queen Mary, University of London, Charterhouse Square, London, EC1M 6BQ, United Kingdom

    Bart Vanhaesebroeck

  3. , Dept. Molecular & Exp. Medicine, Scripps Research Institute, N. Torrey Pines Road 10550, La Jolla, 92037, California, USA

    Peter K. Vogt

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Backer, J.M. (2010). The Regulation of Class IA PI 3-Kinases by Inter-Subunit Interactions. In: Rommel, C., Vanhaesebroeck, B., Vogt, P. (eds) Phosphoinositide 3-kinase in Health and Disease. Current Topics in Microbiology and Immunology, vol 346. Springer, Berlin, Heidelberg. https://doi.org/10.1007/82_2010_52

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