PKD2

Forms a nonselective cation channel. Can function as a homotetrameric ion channel or can form heteromer with PKD1. Displays distinct function depending on its subcellular localization and regulation by its binding partners. In primary cilium functions as a cation channel, with a preference for monovalent cations over divalent cations that allows K(+), Na(+) and Ca(2+) influx, with low selectivity for Ca(2+). Involved in fluid-flow mechanosensation by the primary cilium in renal epithelium (By similarity). In the endoplasmic reticulum, likely functions as a K(+) channel to facilitate Ca(2+) release (By similarity). The heterotetrameric PKD1/PKD2 channel has higher Ca(2+) permeability than homomeric PKD2 channel and acts as a primarily Ca(2+)-permeable channel. Interacts with and acts as a regulator of a number of other channels, such as TRPV4, TRPC1, IP3R, RYR2, ultimately further affecting intracellular signaling, to modulate intracellular Ca(2+) signaling. Together with TRPV4, forms mechano- and thermosensitive channels in cilium. In cardiomyocytes, PKD2 modulates Ca(2+) release from stimulated RYR2 receptors through direct association (By similarity). Also involved in left-right axis specification via its role in sensing nodal flow; forms a complex with PKD1L1 in cilia to facilitate flow detection in left-right patterning (By similarity). Acts as a regulator of cilium length together with PKD1 (By similarity). Mediates systemic blood pressure and contributes to the myogenic response in cerebral arteries though vasoconstriction (By similarity)..

Function from UniProtKB (Q13563), read 2026-09-23. CC BY 4.0.