Index Protein Name Organism UniProt ID/ACC #Protein-Ligand Complex(es) 1 Replicase polyprotein 1a Middle East respiratory syndrome-related coronavirus (isolate United Kingdom/H123990006/2012) (MERS-CoV) (Betacoronavirus England 1) K9N638/R1A_MERS1 8 2 Replicase polyprotein 1a Bat coronavirus HKU4 (BtCoV) (BtCoV/HKU4/2004) P0C6T4/R1A_BCHK4 1 3 Replicase polyprotein 1a Human coronavirus HKU1 (isolate N1) (HCoV-HKU1) P0C6U3/R1A_CVHN1 1 4 Replicase polyprotein 1a Severe acute respiratory syndrome coronavirus (SARS-CoV) P0C6U8/R1A_SARS 10 5 Replicase polyprotein 1a Porcine transmissible gastroenteritis coronavirus (strain Purdue) (TGEV) P0C6V2/R1A_CVPPU 1 6 Replicase polyprotein 1a Avian infectious bronchitis virus (strain M41) (IBV) P0C6V5/R1A_IBVM 1 7 Replicase polyprotein 1a Porcine epidemic diarrhea virus (strain CV777) (PEDV) P0C6V6/R1A_PEDV7 1