| Post Translational Modifications | Phosphorylation by PKC at Ser-180 reduces conductance by 50%. Phosphorylation by PKG at Ser-111 in response to glutamate increases conductance by 40%. Isoform 2: Palmitoylated on its N-terminal region. Isoform 1: Not palmitoylated. |
| Function | Forms a water-specific channel. Plays an important role in brain water homeostasis. It is involved in glymphatic solute transport and is required for a normal rate of water exchange across the blood brain interface. Required for normal levels of cerebrospinal fluid influx into the brain cortex and parenchyma along paravascular spaces that surround penetrating arteries, and for normal drainage of interstitial fluid along paravenous drainage pathways. Thereby, it is required for normal clearance of solutes from the brain interstitial fluid, including soluble beta-amyloid peptides derived from APP. Plays a redundant role in urinary water homeostasis and urinary concentrating ability. |
| Protein Name | Aquaporin-4Aqp-4Mercurial-Insensitive Water ChannelMiwcWch4 |
| Database Links | Reactome: R-HSA-432040Reactome: R-HSA-432047 |
| Cellular Localisation | Cell MembraneMulti-Pass Membrane ProteinBasolateral Cell MembraneEndosome MembraneSarcolemmaCell ProjectionActivation Of The Vasopressin Receptor Avpr1a Triggers Aqp4 Phosphorylation At Ser-180 And Promotes Its Internalization From The Cell MembraneDetected On Brain Astrocyte Processes And Astrocyte Endfeet Close To Capillaries |
| Alternative Protein Names | Aquaporin-4 proteinAqp-4 proteinMercurial-Insensitive Water Channel proteinMiwc proteinWch4 proteinAQP4 protein |
Information sourced from Uniprot.org
