Cited by 299PI3K/AKT/mTOR signaling in cancerProtein Kinase Regulation and GTPase SignalingMetabolism, Diabetes, and Cancer

Structural Basis for Activation and Inhibition of Class I Phosphoinositide 3-Kinases

Vadas, Oscar, Burke, John E., Zhang, Xuxiao, Berndt, Alex, Williams, Roger L.·2011·Science Signaling

Abstract

Phosphoinositide 3-kinases (PI3Ks) are implicated in a broad spectrum of cellular activities, such as growth, proliferation, differentiation, migration, and metabolism. Activation of class I PI3Ks by mutation or overexpression correlates with the development and maintenance of various human cancers. These PI3Ks are heterodimers, and the activity of the catalytic subunits is tightly controlled by the associated regulatory subunits. Although the same p85 regulatory subunits associate with all class IA PI3Ks, the functional outcome depends on the isotype of the catalytic subunit. New PI3K partners that affect the signaling by the PI3K heterodimers have been uncovered, including phosphate and tensin homolog (PTEN), cyclic adenosine monophosphate-dependent protein kinase (PKA), and nonstructural protein 1. Interactions with PI3K regulators modulate the intrinsic membrane affinity and either the rate of phosphoryl transfer or product release. Crystal structures for the class I and class III PI3Ks in complexes with associated regulators and inhibitors have contributed to developing isoform-specific inhibitors and have shed light on the numerous regulatory mechanisms controlling PI3K activation and inhibition.

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Crossref · 10.1126/scisignal.2002165

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  • PI3K activity in the p110α-p85 heterodimer is inhibited by intra- and inter-subunit contacts that become disrupted following engagement of p85 SH2 domains with phosphorylated tyrosine residues in RTK/adapter proteins, and activation favours interaction with the plasma membrane.

    “In this case, the PI3K activity is inhibited by a combination of intra- and inter-subunit contacts that become disrupted following the engagement of the SH2 domains, present in p85, with the phosphorylated tyrosine residues in RTK/adapter proteins in stimulated cells; the activation also favours the interaction with the plasma membrane [74–76].”

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Authors
Vadas, O., Burke, J. E., Zhang, X., Berndt, A., & Williams, R. L.
Affiliations
  • MRC Laboratory of Molecular Biology (GB)
  • Nanyang Technological University (SG)
Corresponding author
  • Vadas, Oscar
  • Williams, Roger L.
Venue
Science Signaling
Published
2011-10-18
Volume
4
Issue
195
Pages
re2-re2
ISSN
  • 1937-9145 (ISSN-L)
  • 1945-0877
OpenAlex
W1973996451
Cited by
299
References
106
Citations by year
2026: 14 · 2025: 15 · 2024: 18 · 2023: 13 · 2022: 20 · 2021: 20 · 2020: 22 · 2019: 27 · 2018: 15 · 2017: 18 · 2016: 17 · 2015: 26 · 2014: 29 · 2013: 29 · 2012: 16
FWCI
2.15
Type
journal article
Language
en
Open access
closed
Locations
  • Science Signaling (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
PI3K activation, PI3K inhibition, p85 regulatory subunit, PTEN, pKa, NS1 protein, isoform-selective inhibitors, crystal structure, membrane affinity, phosphoryl transfer, cancer signaling
MeSH terms
Phosphoinositide-3 Kinase Inhibitors, Enzyme Activation, Humans, Indazoles, Models, Molecular, Neoplasms, Sulfonamides, Signal Transduction, Protein Structure, Tertiary, Phosphatidylinositol 3-Kinases, Protein Subunits, Protein Multimerization

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