| Protein Name | Janus Kinase 3 |
| Gene | JAK3 |
| UniProt ID | P52333 |
| PDB IDs | 1JAK, 3LXK, 5WPX |
| Molecular Weight | 125 kDa |
| Subcellular Localization | Cytoplasm |
| Protein Family | Janus kinase family |
Janus Kinase 3 is a Janus kinase family member. The protein contains the characteristic domain structure including [domain descriptions]. The molecular weight is approximately 125 kDa, and the protein localizes to Cytoplasm.
Janus kinase 3 (JAK3) is primarily expressed in lymphoid cells and is essential for signaling by γc-family cytokines (IL-2, IL-4, IL-7, IL-9, IL-15, IL-21). JAK3 is constitutively associated with the common gamma chain (γc) subunit of these receptors. JAK3 deficiency causes severe combined immunodeficiency (SCID) due to defective T and NK cell development. In the nervous system, JAK3 is expressed in microglia and astrocytes where it contributes to neuroinflammatory responses. JAK3 activates STAT5 and STAT3.
JAK3 deficiency causes autosomal recessive SCID. JAK3 inhibitors are used for transplant rejection prevention and autoimmune diseases. JAK3 in microglia contributes to neuroinflammation in neurodegenerative diseases.
This protein is a potential therapeutic target for neurodegenerative diseases. Research is ongoing to develop small molecule inhibitors and biologics that modulate its activity.
This section provides background information on the gene/protein and its role in the nervous system.
This overview section needs to be expanded with relevant scientific information from peer-reviewed sources.