Non-structural protein 1 (NSP1) (NSP1)

Rotavirus nonstructural protein 1 (NSP1) is a critical virulence factor encoded by gene segment 5 that functions as a powerful antagonist of the host innate immune response. It primarily acts by hijacking host cellular machinery, specifically Cullin-RING ligases (CRLs), to induce the proteasomal degradation of key transcription factors such as interferon regulatory factors (IRF3, IRF5, IRF7, and IRF9) [1, 10, 13]. Additionally, in many human and porcine strains, NSP1 targets the β-transducin repeat-containing protein (β-TrCP) for degradation, thereby preventing NF-κB activation and further suppressing the production of type I and III interferons [14, 15]. Beyond interferon antagonism, NSP1 interacts with host proteins like p53 to suppress early-stage apoptosis and can degrade RNase L to subvert the OAS-RNase L antiviral pathway [11, 12]. Although NSP1 is not always essential for viral replication in vitro, its role in suppressing the host immune response makes it vital for viral spread and pathogenesis in vivo [15, 16]. Consequently, NSP1 is a significant target for the development of novel antiviral strategies and the engineering of live-attenuated vaccines. Research into inhibitors that block NSP1's ability to recruit host ligases, such as neddylation inhibitors, highlights its potential as a therapeutic target [2].

Other names

NCVP2NS53Non-structural RNA-binding protein 53Gene 5 productRotavirus nonstructural protein 1

Induces proteasomal degradation of host antiviral proteins by hijacking host Cullin-RING ubiquitin ligases (CRL1 and CRL3) to act as a viral E3 ligase mimic, or inhibits targeting pathways through direct interaction with signaling proteins such as RIG-I and p53 [6, 11, 13].