Replicase polyprotein 1ab - P19811 (RPOA_EAVBU)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P19811: 5
The replicase polyprotein 1ab is a multifunctional protein: it contains the activities necessary for the transcription of negative stranded RNA, leader RNA, subgenomic mRNAs and progeny virion RNA as well as proteinases responsible for the cleavage of the polyprotein into functional products. (data source: UniProt  )
Nsp1 is essential for viral subgenomic mRNA synthesis. (data source: UniProt  )

Nsp2 cysteine proteinase which cleaves the nsp2/nsp3 site in the polyprotein. Also displays deubiquitinating and deISGylase activities. The deubiquitinating activity cleaves both ubiquitinated and ISGylated products and may therefore regulate ubiquitin and ISG15 dependent host innate immunity. (data source: UniProt  )
The 3C-like serine proteinase chain is responsible for the majority of cleavages as it cleaves the C-terminus of the polyprotein. (data source: UniProt  )
The helicase chain, which contains a zinc finger structure, displays RNA and DNA duplex-unwinding activities with 5' to 3' polarity. (data source: UniProt  )
Catalytic Activity

Thiol-dependent hydrolysis of ester, thioester, amide, peptide and isopeptide bonds formed by the C-terminal Gly of ubiquitin a 76-residue protein attached to proteins as an intracellular targeting signal.

(data source: UniProt  )
Subunit structure
Nsp1 interacts with cellular transcription cofactor SND1/p100. (data source: UniProt  )
The OTU-like region is responsible for the deubiquitinating and deISGylation activities of Nsp2. (data source: UniProt  )
Other Gene names: rep 1a-1b
Isoforms: 2, currently showing only the 'canonical' sequence.
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Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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