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Proteins/UNIPROT:Q13956
Inhibitory gamma subunit of the cone-specific cGMP phosphodiesterase (PDE6) complex which hydrolyzes 3',5'-cyclic GMP in the phototransduction cascade (By similarity). The PDE6 holoenzyme consists of two catalytic alpha subunits (PDE6C) and two inhibitory gamma subunits (PDE6H) (By similarity). Light-activated GNAT2 relieves gamma subunit-mediated inhibition, allowing the catalytic subunits to hydrolyze cGMP and mediate visual signal transduction and amplification. The resulting decrease in cytosolic cGMP levels triggers the closure of cGMP-gated cation channels at the plasma membrane, leading to hyperpolarization of cone photoreceptors (By similarity). Inhibition by the gamma subunit is relatively dynamic and less tightly coupled than in rods, allowing transient access to the catalytic pocket and facilitating the rapid phototransduction kinetics characteristic of cones (By similarity)..
Function from UniProtKB (Q13956), read 2026-09-23. CC BY 4.0.
Curated compounds routed: 0
2 rows
13 statements
13 statements · 6 reference databases · Subject: PDE6H · Sources: gene ontology, Hetionet, Human Protein Atlas, Human-GEM, Rhea, WikiPathways
6 reactions
2 names
Resolves to: PDE6H
Human-GEM MAR04014CC BY 4.0Reference data
3',5'-cyclic GMP+waterGMP+proton
Catalysed by PDE8A or PDE6C or PDE10A or PDE8B or PDE4D or PDE1A or PDE1B or PDE11A or PDE6A or PDE6B or PDE5A or PDE6H and 7 more alternatives
Reaction pageLeft to rightBalancedEC 3.1.4.17, 3.1.4.35cytosol
Human-GEM MAR04048CC BY 4.0Reference data
3',5'-cyclic GMP+waterGMP+proton
Catalysed by PDE6C or PDE4C or PDE10A or PDE4D or PDE1A or PDE1B or PDE11A or PDE6A or PDE6B or PDE5A or PDE6H or PDE3B and 7 more alternatives
Reaction pageLeft to rightBalancedEC 3.1.4.35nucleus
Human-GEM MAR08083CC BY 4.0Reference data
3',5'-cyclic GMP+waterGMP+proton
Catalysed by PDE8A or PDE6C or PDE4C or PDE10A or PDE4D or PDE1A or PDE1B or PDE11A or PDE6A or PDE6B or PDE5A or PDE6H and 6 more alternatives
Reaction pageLeft to rightBalancedEC 3.1.4.17Golgi apparatus
Human-GEM MAR08085CC BY 4.0Reference data
3',5'-cyclic AMP+waterAMP+proton
Catalysed by PDE4A or PDE8A or PDE4C or PDE10A or PDE8B or PDE4D or PDE1A or PDE1B or PDE11A or PDE6H or PDE3B or PDE1C and 6 more alternatives
Reaction pageLeft to rightBalancedEC 3.1.4.17Golgi apparatus
Human-GEM MAR08087CC BY 4.0Reference data
3',5'-cyclic GMP+waterGMP+hydron
Catalysed by PDE2A or PDE5A or PDE9A or PDE6A or PDE6B or PDE6C or PDE1A or PDE1B or PDE3B or PDE6H or PDE1C or PDE3A and 3 more alternatives
Reaction pageLeft to rightBalanced
Rhea RHEA:16957CC BY 4.0Reference data