Adenylate cyclase 6 (ADCY6) is a membrane-bound enzyme that catalyzes the conversion of ATP to cyclic AMP (cAMP). In the nervous system, ADCY6 plays important roles in signal transduction and synaptic plasticity.
Adenylate Cyclase 6 (AC6) Protein
Introduction
Adenylate Cyclase 6 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@cooper2020]
Adenylate Cyclase 6 (AC6), also known as ADCY6, is a member of the adenylate cyclase family that catalyzes the conversion of ATP to cyclic AMP (cAMP). AC6 is uniquely characterized by its calcium-inhibited phenotype, distinguishing it from calcium-activated isoforms like AC1 and AC8. This protein plays critical roles in signal transduction, synaptic plasticity, and cellular homeostasis in the nervous system. [@storm2019]
Adenylate cyclase 6 (ADCY6) is a membrane-bound enzyme that catalyzes the conversion of ATP to cyclic AMP (cAMP). In the nervous system, ADCY6 plays important roles in signal transduction and synaptic plasticity.
Adenylate Cyclase 6 (AC6) Protein
Introduction
Adenylate Cyclase 6 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@cooper2020]
Adenylate Cyclase 6 (AC6), also known as ADCY6, is a member of the adenylate cyclase family that catalyzes the conversion of ATP to cyclic AMP (cAMP). AC6 is uniquely characterized by its calcium-inhibited phenotype, distinguishing it from calcium-activated isoforms like AC1 and AC8. This protein plays critical roles in signal transduction, synaptic plasticity, and cellular homeostasis in the nervous system. [@storm2019]
Structure
AC6 possesses the typical modular architecture of membrane-bound adenylate cyclases: [@mons2020]
12 Transmembrane Helices: Six transmembrane segments in the N-terminal and six in the C-terminal regions
Cytosolic Catalytic Domains: C1a and C2a cytoplasmic domains that form the catalytic core
Calcium-Binding Site: Unique C-terminal region responsible for calcium inhibition
G Protein-Binding Regions: Sites for interaction with Gsα and Giα subunits
Molecular Function
Catalytic Activity
AC6 catalyzes the conversion of ATP to cAMP: [@chevrier2018]
Primary reaction: ATP → cAMP + PPi
K_m for ATP: ~100 μM
V_max: Comparable to other AC isoforms
Calcium Inhibition
Unlike most neuronal ACs, AC6 is inhibited by elevated intracellular calcium: [@gomes2022]
Calcium/calmodulin binding to C2a domain
Negative feedback mechanism for calcium homeostasis
Distinct from Ca2+-stimulated AC1 and AC8
Important for preventing excessive cAMP during calcium influx
G Protein Regulation
Gsα activation: Stimulates AC6 activity 3-5 fold
Giα inhibition: Reduces AC6 activity by 30-50%
Gβγ complex: Modulates AC6 depending on cellular context
Forskolin: Direct activator of catalytic domains
Second Messenger Pathways
AC6-generated cAMP activates: [@puri2021]
Protein kinase A (PKA)
Epac (Exchange protein activated by cAMP)
cAMP-gated ion channels
Expression Pattern
Brain Regions
Cerebral [cortex](/brain-regions/cortex): Moderate expression in pyramidal neurons
[Hippocampus](/brain-regions/hippocampus): High expression in CA1-CA3 regions
Cerebellum: Purkinje cells show prominent AC6
Basal ganglia: Moderate expression in striatum
Brainstem: Variable expression patterns
Cell Type Specificity
[Neurons](/entities/neurons): Primary expression in excitatory neurons
[Astrocytes](/entities/astrocytes): Lower expression compared to neurons
The study of Adenylate Cyclase 6 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development. [@dessauer2020]
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
External Links
[PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
[Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
[Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
References
[Sunahara RK, et al, Mammalian adenylyl cyclases: recent advances and perspectives (2021)](https://pubmed.ncbi.nlm.nih.gov/33891426/)
[Cooper DMF, et al, Regulation of adenylyl cyclases by calcium (2020)](https://pubmed.ncbi.nlm.nih.gov/32730845/)
[Storm SM, et al, Adenylate cyclase isoform expression in human brain (2019)](https://pubmed.ncbi.nlm.nih.gov/31390012/)
[Mons N, et al, Calcium-inhibited adenylyl cyclases in the brain (2020)](https://pubmed.ncbi.nlm.nih.gov/32707123/)
[Chevrier V, et al, AC6 and memory formation (2018)](https://pubmed.ncbi.nlm.nih.gov/30115782/)
[Gomes P, et al, cAMP signaling in neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/34050467/)
[Puri S, et al, Adenylate cyclases as therapeutic targets (2021)](https://pubmed.ncbi.nlm.nih.gov/33376253/)
[Dessauer CW, et al, International Union of Basic and Clinical Pharmacology.Pharmacol Rev (2020)](https://pubmed.ncbi.nlm.nih.gov/32783776/)