Overview
Occludin is a pivotal component of tight junctions, the specialized cell-cell contacts that form selective barriers in epithelial and endothelial tissues. First identified in 1993, this transmembrane protein spans the plasma membrane four times, with both termini located intracellularly. It plays critical roles in maintaining cellular polarity and regulating paracellular transport. In humans, occludin is encoded by the OCLN gene located on chromosome 5. Alternative splicing produces several isoforms with varying molecular weights and functions. The protein's expression is particularly abundant in tissues with strong barrier functions, such as the blood-brain barrier and intestinal epithelium.
Physical and Chemical Properties
As a transmembrane protein, occludin exhibits hydrophobic properties in its membrane-spanning regions, while its intracellular domains contain phosphorylation sites that regulate its function. The protein typically migrates at 65-70 kDa on SDS-PAGE, though post-translational modifications can affect this mobility. The extracellular loops of occludin interact with adjacent cells to form the tight junction seal. These loops contain conserved amino acid sequences that facilitate homotypic binding. The C-terminal cytoplasmic domain binds to various scaffold proteins, linking occludin to the actin cytoskeleton and enabling dynamic regulation of barrier properties.
Main Applications
In biomedical research, occludin serves as a key marker for tight junction integrity. Studies utilize antibodies against occludin to assess epithelial barrier function in conditions like inflammatory bowel disease or cancer metastasis. Pharmaceutical researchers investigate occludin modulation to enhance drug delivery across biological barriers. The protein also finds application in tissue engineering, where maintaining proper occludin expression is crucial for creating functional epithelial constructs. Additionally, virologists study occludin's role as a receptor for certain viruses, including Hepatitis C virus, making it a potential target for antiviral therapies.
Safety and Storage
Recombinant occludin proteins require careful handling to maintain stability. Lyophilized preparations should be reconstituted in appropriate buffers containing protease inhibitors. Aliquotting is recommended to minimize freeze-thaw cycles that can degrade the protein. For antibody-based detection methods, ensure proper blocking steps to prevent nonspecific binding. When working with cell cultures for occludin studies, maintain sterile conditions to avoid confounding effects from microbial contamination on tight junction integrity.
B2B Procurement Guide
When sourcing occludin-related products, clearly specify whether you require the full-length protein, specific domains, or detection antibodies. Research-grade proteins typically suffice for most applications, but clinical studies may require GMP-grade materials. Consider the species specificity of your reagents—human, mouse, and rat occludin show some sequence variations that can affect antibody cross-reactivity. For large-scale purchases, request batch-to-batch consistency data and consider vendor reputation in the cell biology research community.
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