Granzyme A
Class of enzymes
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Granzyme A (GzmA, EC 3.4.21.78, CTLA3, HuTPS, T-cell associated protease 1, cytotoxic T lymphocyte serine protease, TSP-1, T-cell derived serine proteinase) is a tryptase[5][6][7] and is one of the five granzymes encoded in the human genome.[8][9][10] In humans, GzmA is encoded by the GZMA gene in proximity to the GZMK gene on chromosome 5. This enzyme is present in cytotoxic T lymphocyte (CTL) granules.
| Granzyme A | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 3.4.21.78 | ||||||||
| CAS no. | 143180-73-8 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| |||||||||
GzmA cleaves proteins after arginine or lysine basic residues. In CTL-targeted cells, it activates caspase-independent programmed cell death pathways that are unique and parallel to that of Granzyme B, although some substrates such as PARP-1[11] and lamin B[12] are shared with Granzyme B. Substrates of GzmA include Pro-IL-1β,[13] NDUFS3,[14] SET, APE1, and Ku70 among others. In vitro studies suggest that GzmA may have less cytotoxic capabilities than GzmB.[15][16]
In colorectal cancer, GzmA was associated with promotion of cancer development, which may be due to activation of inflammation-inducing cytokines from macrophages.[17]
