Abstract
AMPK is an evolutionarily conserved serine/threonine-protein kinase that acts as an energy sensor in cells and plays a key role in the upregulation of catabolism and inactivation of anabolism. Under various physiological and pathological conditions, AMPK can be phosphorylated by an upstream kinase and bind to AMP or ADP rather than ATP, leading to its activation. Activated AMPK regulates a variety of metabolic processes, including autophagy. AMPK promotes autophagy directly by phosphorylating autophagy-related proteins in the mTORC1, ULK1, and PIK3C3/VPS34 complexes or indirectly by regulating the expression of autophagy-related genes downstream of transcription factors such as FOXO3, TFEB, and BRD4. AMPK can also upregulate the autophagic degradation of mitochondria (mitophagy), as it can induce fragmentation of damaged mitochondria in the network and promote the translocation of the autophagy machinery to damaged mitochondria. In this section, we will detail the molecular structure of AMPK, how its activity is regulated, and its pivotal role in regulating autophagy and mitophagy.
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Abbreviations
- ACC:
-
Acetyl-CoA carboxylase
- ACSS2:
-
Acetyl-CoA synthetase 2
- ADaM:
-
Allosteric drug and metabolite
- ADP:
-
Adenosine diphosphate
- AICAR:
-
5-aminoimidazole-4-carboxamide riboside
- AMP:
-
Adenosine monophosphate
- AMPK:
-
AMP-activated protein kinase
- ATP:
-
Adenosine triphosphate
- ATG:
-
Autophagy-related gene
- BMDM:
-
Bone marrow-derived macrophages
- BRD4:
-
Bromodomain-containing protein 4
- CAMKK2:
-
Calmodulin-dependent protein kinases kinase 2
- CARM1:
-
Coactivator-associated arginine (R) methyltransferase 1
- CBD:
-
Carbohydrate-binding domain
- CBS:
-
Cystathionine β-synthase
- CHOP:
-
C/EBP homologous protein
- CCCP:
-
Carbonyl cyanide 3-chlorophenylhydrazone
- DDIT3:
-
DNA damage-inducible transcript 3
- DRP1:
-
Dynamin-related protein 1
- FAS:
-
Fatty acid synthase
- FOXK:
-
Forkhead box protein K
- FOXO3:
-
Forkhead box O3
- FUNDC1:
-
FUN14 domain-containing protein 1
- GAP:
-
GTPase-activating protein
- GBD:
-
Glycogen-binding domain
- GDP:
-
Guanine dinucleotide phosphate
- GLUT4:
-
Glucose Transporter 4
- GPAT:
-
Glycerol phosphate acyltransferase
- GSK3β:
-
Glycogen synthase kinase 3 beta
- GTP:
-
Guanine trinucleotide phosphate
- HSF1:
-
Heat shock factor 1
- IGF-1:
-
Insulin-like growth factor 1
- LKB1:
-
Liver kinase B1
- MAPKK:
-
Mitogen-activated protein kinase kinase
- MEF:
-
Mouse embryonic fibroblasts
- MFF:
-
Mitochondrial fission factor
- MO25:
-
Mouse protein 25
- mtDNA:
-
Mitochondrial DNA
- mTOR:
-
Mammalian target of rapamycin
- NBS:
-
Nucleotide-binding site
- NES:
-
Nuclear export sequence
- NMT1:
-
N-myristoyl transferase 1
- NRF2:
-
Nuclear factor erythroid 2-related factor 2
- PAQR3:
-
Progestin and adipo-Q receptor 3
- PGC1α:
-
PPARγ coactivator 1α
- PI3P:
-
Phosphatidylinositol 3-phosphate
- PIK3C3:
-
Phosphatidylinositol 3-kinase catalytic subunit 3
- PIK3R4:
-
Phosphoinositide 3-kinase regulatory subunit 4
- PINKl:
-
PTEN induced kinase 1
- PKA:
-
Protein kinase A
- PKB:
-
Protein kinase B
- PKC:
-
Protein kinase C
- PKD:
-
Protein kinase D
- PP2A:
-
Protein phosphatase 2A
- PPARγ:
-
Peroxisome proliferator-activated receptor γ
- PPM1E:
-
Protein Phosphatase, Mg2+/Mn2+-Dependent 1E
- PRKAA:
-
AMP-activated protein kinase catalytic subunit alpha
- PRKAB:
-
AMP-activated protein kinase subunit beta
- PRKAG:
-
AMP-activated protein kinase subunit gamma
- RACK1:
-
Receptor for activated C kinase 1
- RB1CC1:
-
RB1-inducible coiled-coil 1
- RHEB:
-
Ras Homolog Enriched in Brain
- RNS:
-
Reactive nitrogen species
- ROS:
-
Reactive oxygen species
- SKP2:
-
S-phase kinase-associated protein 2
- STK11:
-
Serine/Threonine kinase 11
- STRAD:
-
Ste20-related adaptor protein
- TAK1:
-
Transforming growth factor-β-activating kinase 1
- TCA:
-
Tricarboxylic acid cycle
- TFEB:
-
Transcription Factor EB
- TNFSF10:
-
TNF superfamily member 10
- TRAIL:
-
TNF-related apoptosis inducing ligand
- TSC:
-
Tuberous sclerosis complex
- TZD:
-
Thiazolidinediones,
- ULK1:
-
Unc-51-like kinase 1
- UVRAG:
-
Ultraviolet radiation resistance‑associated gene protein
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Li, Y., Chen, Y. (2019). AMPK and Autophagy. In: Qin, ZH. (eds) Autophagy: Biology and Diseases. Advances in Experimental Medicine and Biology, vol 1206. Springer, Singapore. https://doi.org/10.1007/978-981-15-0602-4_4
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DOI: https://doi.org/10.1007/978-981-15-0602-4_4
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