Material Data Sheet

Papain-Like Protease, SARS, His6 tag

Price: $225.00
Catalog #: E-610

Papain-Like Protease, SARS, His6 tag

50 µg
Data Sheet: 

The Papain-like protease ("PLPro") from the human SARS coronavirus (Severe Acute Respiratory Syndrome coronavirus) is a cysteine protease located within the non-structural protein 3 (NS3) section of the viral polypeptide. PLPro activity is required to process the viral polyprotein into functional, mature subunits; specifically, PLPro cleaves a site at the amino-terminus of the viral replicase region. In addition to its role in viral protein maturation, PLPro possesses a deubiquitinating and deISGylating activity. In vivo, this protease antagonizes innate immunity by inhibiting IRF3-induced production of type I interferons. PLPro has been reported to hydrolyze both K48- and K63-linked poly-Ubiquitin chains in vitro. When used at low concentrations, the enzyme demonstrates a strong preference for K48-linked tetra-Ubiquitin chains which are primarily converted to di-Ubiquitin species. This protein contains an N-terminal 6-His tag.

Product Information

X mg/ml (X μM) in 50 mM HEPES pH 7.5, 100 mM NaCl, 2 mM TCEP
37 kDa
> 95% by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie Blue stain

Use & Storage


Recombinant SARS virus PLPro is a Ubiquitin- and ISG15-deconjugating enzyme.  Reaction conditions will need to be optimized for each specific application. We recommend an initial PLPro concentration of 20-100 nM when using Ubiquitin-AMC or Ubiquitin-Rh110 (U-550, U-555) substrates. Using tetra-Ubiquitin chains as a substrate, PLPro demonstrates a preference for K48 linkages when using a 100 nM enzyme concentration—at higher enzyme concentration other linkages are cleaved as well.


Store at -80ºC.  Avoid multiple freeze-thaw cycles