Natural killer cell granule protein 7 (NKG7) (NKG7)

Natural killer cell granule protein 7 (NKG7) is a critical transmembrane protein primarily expressed in natural killer (NK) cells and cytotoxic T lymphocytes (CTLs) (UniProt P06727). It serves as a key regulator of the cytolytic granule trafficking machinery, where it is essential for the transport and exocytosis of granules containing perforin and granzymes at the immunological synapse (Ng et al., 2020, Nature Immunology). Without functional NKG7, cytotoxic cells fail to effectively kill target cells, such as virally infected or malignant cells, because the granules cannot be properly mobilized to the plasma membrane for release (PubMed PMID: 32433612). In the context of disease, NKG7 is a significant marker of effector cell activation and is often upregulated in the tumor microenvironment, where high expression correlates with improved patient outcomes in various cancers (Malarkannan, 2020). Conversely, excessive NKG7 activity has been implicated in the pathogenesis of hyper-inflammatory conditions and autoimmune diseases, such as rheumatoid arthritis and severe COVID-19, by promoting excessive tissue damage (PubMed PMID: 32834999). While there are currently no FDA-approved drugs that directly target NKG7, it is an area of active research for the development of immunotherapies aimed at either enhancing anti-tumor immunity or dampening pathological inflammation.

Other names

GIG1GMP-17p15-TIA-1Natural killer cell group 7 sequenceG-protein induced gene 1

Facilitates the mobilization and exocytosis of cytolytic granules containing perforin and granzymes to the immunological synapse.