Protein Domain : Claudin-9 IPR003553

Type	Family
Description	Claudins form the paracellular tight junction seal in epithelial tissues. In humans, 24 claudins (claudin 1-24) have been identified. Their ability to polymerise and form strands is affected by the cell types [ , , ]. They can also form heteropolymers with each other within and between tight junction strands []. Most of the claudins (claudin-12 being the exception) have a C-terminal PDZ-binding motif that can interact with other PDZ domain proteins, such as scaffolding protein, ZO-1, -2 and -3 []. They also interact with non-tight junction proteins, such as cell adhesion proteins EpCam and tetraspanins and the signaling proteins, ephrin A and B and their receptors, EphA and EphB [].Claudin-9 was identified through cDNA database searching, pursuing sequences similar to other claudin family members []. Human and mouse isoforms havebeen cloned. Claudin-9 shares ~25-70% overall similarity with other claudin family members at the amino acid level, displaying highest similarity toclaudin-6.
Short Name	Claudin9