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CLDN4

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For Research Use Only. Not For Clinical Use.


This gene encodes a member of the claudin family. Claudins are integral membrane proteins and components of tight junction strands. Tight junction strands serve as a physical barrier to prevent solutes and water from passing freely through the paracellular space between epithelial or endothelial cell sheets, and also play critical roles in maintaining cell polarity and signal transductions. The protein encoded by this gene is a high-affinity receptor for clostridium perfringens enterotoxin (CPE) produced by the bacterium Clostridium perfringens, and the interaction with CPE results in increased membrane permeability by forming small pores in plasma membrane. This protein augments alveolar epithelial barrier function and is induced in acute lung injury. It is highly expressed in pancreatic and ovarian cancers.
Protein class

Cancer-related genes, Disease related genes, Human disease related genes, Potential drug targets, Transporters

Predicted location

Membrane

Single cell type specificity

Cell type enhanced (Urothelial cells, Basal prostatic cells, Glandular and luminal cells, Prostatic glandular cells, Paneth cells)

Immune cell specificity

Not detected in immune cells

Cell line specificity

Cell line enhanced (A-431, BEWO, CAPAN-2, MCF7, OE19, PC-3, RT4, SK-BR-3)

Interaction

Directly interacts with TJP1/ZO-1 (PubMed:16236711). Interacts with TJP2/ZO-2 and TJP3/ZO-3 (By similarity). Interacts with EPHA2; phosphorylates CLDN4 and may regulate tight junctions (PubMed:16236711). Interacts with CLDN1 (PubMed:20375010). Interacts with CLDN8 (By similarity). (Microbial infection) Interacts (via both extracellular domains) with Clostridium perfringens enterotoxin CPE; the interaction may disrupt claudin assembly in tight junctions.

Molecular function

Chloride channel, Ion channel

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