OAS3 is an interferon inducible protein that belongs to the 2-5A synthetase family, may play a role in mediating resistance to virus infection, control of cell growth, differentiation, and apoptosis. OAS3 synthesizes preferentially dimeric 2',5'-oligoadenylate molecules. GTP can be an alternative substrate. OAS3 binds double-stranded RNA and polymerizes ATP into PPP(A2'P5'A)N oligomers, which activate the latent RNase L that, when activated, cleaves single-stranded RNAs. The protein is present at high level in placenta trophoblast.
(2-5')oligo(A) synthase 3; (2-5')oligo(A) synthetase 3; 2'-5'-oligoadenylate synthase 3; 2'-5'-oligoadenylate synthetase 3, 100kDa; 2'-5'oligoadenylate synthetase p100; 2-5A synthase 3; 2-5A synthetase 3; p100 OAS; p100OAS