Cited by 362Metabolism, Diabetes, and CancerBiochemical and Molecular ResearchProtein Kinase Regulation and GTPase Signaling

AMP-Activated Protein Kinase: An Ultrasensitive System for Monitoring Cellular Energy Charge

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HARDIE, D. Grahame, SALT, Ian P., HAWLEY, Simon A., DAVIES, Stephen P.·1999·Biochemical Journal

Abstract

The AMP-activated protein kinase cascade is activated by elevation of AMP and depression of ATP when cellular energy charge is compromised, leading to inhibition of anabolic pathways and activation of catabolic pathways. Here we show that the system responds in intact cells in an ultrasensitive manner over a critical range of nucleotide concentrations, in that only a 6-fold increase in activating nucleotide is required in order for the maximal activity of the kinase to progress from 10% to 90%, equivalent to a co-operative system with a Hill coefficient (h) of 2.5. Modelling suggests that this sensitivity arises from two features of the system: (i) AMP acts at multiple steps in the cascade (multistep sensitivity); and (ii) the upstream kinase is initially saturated with the downstream kinase (zero-order ultrasensitivity).

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Crossref · 10.1042/bj3380717

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Authors
HARDIE, D. G., SALT, I. P., HAWLEY, S. A., & DAVIES, S. P.
Affiliations
University of Dundee (GB)
Venue
Biochemical Journal
Published
1999-03-08
Volume
338
Issue
3
Pages
717-722
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W2014670133
Cited by
362
References
37
Citations by year
2026: 5 · 2025: 5 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 7 · 2020: 5 · 2019: 5 · 2018: 13 · 2017: 7 · 2016: 12 · 2015: 15 · 2014: 16 · 2013: 17 · 2012: 20
FWCI
5.05
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust
  • York University
  • University of Bristol
  • University at Buffalo
  • Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
AMPK, ultrasensitivity, AMP, ATP, Hill coefficient, cooperative activation, energy homeostasis
MeSH terms
Amino Acid Sequence, Cell Line, Energy Metabolism, Kinetics, Models, Biological, Molecular Sequence Data, Multienzyme Complexes, Sensitivity and Specificity, Protein Serine-Threonine Kinases, AMP-Activated Protein Kinases

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