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Occludin

Domain

The C-terminal is cytoplasmic and is important for interaction with ZO-1. Sufficient for the tight junction localization. Involved in the regulation of the permeability barrier function of the tight junction (By similarity). The first extracellular loop participates in an adhesive interaction.

Function

May play a role in the formation and regulation of the tight junction (TJ) paracellular permeability barrier. It is able to induce adhesion when expressed in cells lacking tight junctions.

(Microbial infection) Acts as a co-receptor for hepatitis C virus (HCV) in hepatocytes.

Involvement in disease

Pseudo-TORCH syndrome 1

PTORCH1

An autosomal recessive neurologic disorder with characteristic clinical and neuroradiologic features that mimic intrauterine TORCH infection in the absence of evidence of infection. Affected individuals have congenital microcephaly, intracranial calcifications, and severe developmental delay.

None

The disease is caused by variants affecting the gene represented in this entry.

Post-translational modifications

Dephosphorylated by PTPRJ. The tyrosine phosphorylation on Tyr-398 and Tyr-402 reduces its ability to interact with TJP1. Phosphorylation at Ser-490 also attenuates the interaction with TJP1.

Sequence similarities

Belongs to the ELL/occludin family.

Tissue specificity

Localized at tight junctions of both epithelial and endothelial cells. Highly expressed in kidney. Not detected in testis.

Cellular localization

  • Cell membrane
  • Multi-pass membrane protein
  • Cell junction
  • Tight junction

Alternative names

  • Occludin
  • OCLN

Target type

Proteins

Primary research area

Oncology

Molecular weight

59144Da