Replicase polyprotein N-term from Coronavirus nsp1
CNV-Replicase_N is the N-terminal domain of a family of ssRNA positive-stranded porcine transmissible gastroenteritis coronaviruses. the domain folds into a six-stranded beta-barrel fold with a long alpha helix on the rim of the barrel. This fold is shared with SARS-CoV nsp1.