AMP-Activated Protein Kinase Signaling in Metabolic Regulation

AMP-activated protein kinase (AMPK) operates as a pivotal cellular energy sensor, coordinating metabolic pathways to maintain energy homeostasis. This heterotrimeric kinase comprises catalytic α and regulatory β and γ subunits, which together detect fluctuations in the cellular AMP/ADP:ATP ratio. Under energy stress—such as nutrient deprivation, hypoxia or increased workload—rising levels of AMP and ADP promote AMPK phosphorylation at threonine-172 within the activation loop, catalysed primarily by upstream kinases including liver kinase B1 (LKB1) and, in certain contexts, Ca2+/calmodulin-dependent protein kinase kinases. Once activated, AMPK shifts cellular metabolism towards ATP generation by stimulating glucose uptake, glycolysis and fatty acid oxidation, while inhibiting anabolic processes such as lipid and protein synthesis. Beyond core metabolic control, AMPK influences mitochondrial biogenesis, autophagy and redox balance, and exerts context-dependent effects on cell growth, proliferation and survival. These diverse roles underpin AMPK’s status as a therapeutic target in metabolic diseases, neurodevelopmental disorders and cancer, where modulation of its activity offers prospects for restoring metabolic equilibrium and overcoming pathological stress adaptations.

Research from Nature Portfolio

Recent studies have uncovered mechanisms that refine spatial and structural control of AMPK activation. One investigation identified TBC1D23 as a Golgi-localized scaffold that recruits LKB1, enabling site-specific phosphorylation and activation of AMPK under energy stress. Disruption of this Golgi-LKB1 axis impairs AMPK signalling, leading to defects in neuronal development and metabolic regulation in model organisms. This work expands understanding of how subcellular compartmentalisation shapes AMPK’s role in both energy sensing and organelle-targeted responses.

Structural insights have been provided by the elucidation of human AMPK in complex with a small-molecule activator. The crystal structure reveals an allosteric binding pocket at the interface between the kinase domain and the carbohydrate-binding module, stabilising the active conformation and mimicking AMP-mediated effects. This framework has informed the rational design of next-generation activators, emphasising opportunities to exploit the newly characterised pocket for selective modulation of AMPK in metabolic disorders.

AMP-Activated Protein Kinase Signaling in Metabolic Regulation publication trend

The graph below shows the total number of articles in amp-activated protein kinase signaling in metabolic regulation across all publications each year (not limited to Nature Index journals).

Technical terms

AMP/ADP:ATP ratio: The relative concentrations of adenine nucleotides, reflecting cellular energy status and driving AMPK activation.

Phosphorylation: The covalent attachment of a phosphate group to a protein residue (here Thr172) that regulates AMPK activity.

Allosteric activation: Enhancement of enzyme activity through ligand binding at a site distinct from the active site.

Heterotrimeric complex: A protein assembly composed of three distinct subunits (α, β, γ) that form the AMPK holoenzyme.

Upstream kinase: An enzyme (e.g. LKB1, CaMKK) responsible for phosphorylating and thereby activating AMPK.

Ferroptosis: An iron-dependent form of regulated cell death characterised by lipid peroxidation and metabolic vulnerability.

References

1. TBC1D23 mediates Golgi-specific LKB1 signaling. Nature Communications (2024).
2. Structural basis of AMPK regulation by small molecule activators. Nature Communications (2013).
3. A Novel AMPK Inhibitor Sensitizes Pancreatic Cancer Cells to Ferroptosis Induction. Advanced Science (2024).
4. AMP-activated protein kinase mediates adaptation of glioblastoma cells to conditions of the tumor microenvironment. Journal of Experimental & Clinical Cancer Research (2025).
5. Metabolic control by AMPK in white adipose tissue. Trends in Endocrinology and Metabolism (2023).