The multifunctional SARS-CoV-2 PP1ab protein is essential for viral RNA transcription and replication, utilizing proteases for multi-protein cleavage. It inhibits host translation by binding to the 40S subunit and blocks ribosomal mRNA entry channels, thereby hindering the antiviral response. RdRP Protein, Severe acute respiratory syndrome coronavirus 2 (2019-nCoV) (SARS-CoV-2) (Sf9, His, Strep) is the recombinant virus-derived RdRP, expressed by Sf9 insect cells, with Strep, His labeled tag.