E3 ubiquitin-protein ligase RNF19B (RNF19B)

E3 ubiquitin-protein ligase RNF19B (RNF19B), also known as Natural killer lytic-associated molecule (NKLAM), is a multi-pass membrane protein containing two RING-type and one IBR-type zinc finger motifs[1][3][9]. As a member of the RING-IBR-RING (RBR) family of E3 ubiquitin ligases, RNF19B mediates the ubiquitination of target proteins, influencing their degradation, localization, and function. Its activity is essential for the maximal cytotoxicity and cytokine production of natural killer (NK) cells and macrophages, acting as a positive regulator in the innate immune response by modulating STAT1-dependent transcription[1][2][3][7]. RNF19B utilizes K63-linked polyubiquitination to enhance the DNA binding ability of STAT1, without directing it for degradation, thus promoting anti-pathogen defenses[1]. While crucial for immunity, its broader role encompasses regulation of autophagy and responses to ER stress[5]. Alternative splicing results in several transcript variants, and pseudogenes are present on chromosomes X and Y[1][9]. No approved drugs currently target RNF19B directly, and no validated biomarkers or patient selection strategies are established for this molecule[2][3][7][9]. Its manipulation may pose immunological risks due to its fundamental role in cytotoxic immune responses.

Other names

Natural killer lytic-associated moleculeNKLAMIBRDC3IBR domain-containing protein 3Ring finger protein 19B

Not applicable (no known drugs directly targeting RNF19B with defined mechanisms as of current evidence[2][3][7][9]).